M~IIN E A C MA UAL

YZ R

E434A/S/C E515A/S/C E525A/S/C

MAINTENANCE MANUAL

MICROWAVE SYSTEM ANALYZER

ME434A/S/C ME515A/S/C ME525A/S/C

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CONTENTS

Page

SECTION 1 GENERAL INFORMATION

1.1 INTRODUCTION.................................................... 1-1 1.2 PERIOD OF MAINTENANCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 1-1 1.3 ORDERING OF REPAIR PARTS " 1-1 1.4 DISTINCTION BETWEEN PERFORMANCE CHECK AND CALIBRATION. . . . .. 1-1 1.5 SPECIFICATIONS 1-1

SECTION 2 PERFORMANCE CHECKS

2.1 INTRODUCTION.................................................... 2-1 2.2 PERFORMANCE CHECKS 2-1

SECTION 3 PREPARATION OF REPAIR

3.1 INTRODUCTION 3-1 3.2 DECOMPOSITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3-1

3.2.1 Withdrawal of CRT of CRT DISPLAY 3-1 3.2.2 Withdrawal of the Units 3-2 3.2.3 Inspection of Interior of Each Unit 3-2 3.2.4 Replacement of the Lamps 3-3

3.3 INSTRUMENTS FOR REPAIR AND CALIBRATION 3-3 3.4 CHECK OF CIRCUIT BOARD OF EACH UNIT 3-3

SECTION 4 CALIBRATION

4.1 INTRODUCTION.................................................... 4-1 4.2 BB GENERATOR 4-2

4.2.1 BB OUTPUT Signal " 4-3 4.2.2 SWEEP OUTPUT Signal 4-3 4.2.3 BB + SWEEP OUTPUT Signal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-3

4.3 IF SWEEP GENERATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-4 4.3.1 IF OUTPUT LEVEL Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-5 4.3.2 SWEEP CENTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-5

-i

CONTENTS (Cont)

Page

4.3.3 SWEEP WIDTH 4-5 4.3.4 FM DEVIATION 4-5

4.4 IF RECEIVER 4-6 4.4.1 IF INPUT LEVEL Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4-7 4.4.2 CENTER FREQUENCY MARKER ; . . . . . . . . . . . . . . .. 4-7 4.4.3 SPECTRUM CENTER 4-7 4.4.4 AMPL CAL 4-7

4.5 BB RECEIVER " 4-8 4.5.1 BB INPUT LEVEL Meter 4-9 4.5.2 DELAY (DP) CAL 4-9 4.5.3 LINEARITY (DG) CAL 4-9

4.6 CRT DISPLAY " 4-10 4.6.1 TRACE ROTATION " 4-10 4.6.2 VERTICAL GAIN SENSITIVITY 4-10

SECTION 5 REPAIR

5.1 INTRODUCTION.................................................... 5-1 5.2 EQUIPMENT 5-2

5.2.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-2 5.2.2 Troubleshooting of Equipment 5-9 5.2.3 Other Troubles 5-18

5.3 BB GENERATOR 5-20 5.3.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-20 5.3.2 Troubleshooting of BB GENERATOR 5-25 5.3.3 Z1 POWER SUPPLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-26 5.3.4 Z2 BB OSC AND DIVIDER 5-28 5.3.5 Z3 SWEEP CCT , 5-32 5.3.6 Z4 BB FILTER 5-34 5.3.7 Z5 AGC AMP 5-36 5.3.8 Z6 OUTPUT AMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-38 5.3.9 Z7 MOTHER BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-40 5.3.10 Z8 TO Zll BB OSC AND FILTER 5-42

-ii

CONTENTS (Cont)

Page

5.4 IF SWEEP GENERATOR 5-44 5.4.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-44 5.4.2 Troubleshooting of IF SWEEP GENERATOR 5-49 5.4.3 Z1 MIX AND AGC 5-50 5.4.4 Z2 IF AMP 5-52 5.4.5 Z3 DIVIDER AND PCD 5-54 5.4.6 Z4 OSC DRIVE CCT 5-56 5.4.7 Z5 COMPARISON CCT 5-58 5.4.8 Z6 VIDEO AGC 5-60 5.4.9 Z7 70 MHz/140 MHz X'TAL OSC 5-62 5.4.10 Z8 POWER SUPPLY 5-64 5.4.11 Z9 BRIDGE :. 5-66 5.4.12 Z10 DIAL CONTROL 5-68 5.4.13 Zll FM OSC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-70 5.4.14 Z12 SWEEP OSC 5-72 5.4.15 Z13 BUFFER AMP 5-74 5.4.16 Z14 MOTHER BOARD 5-76 5.4.17 Z15 DIAL SENS CCT 5-78

5.5 IF RECEIVER 5-80 5.5.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-80 5.5.2 Troubleshooting of IF RECEIVER 5-85 5.5.3 Zl HORIZONTAL AMP 5-88 5.5.4 Z2 INPUT AMP AND AMPL DETECTOR. . . . . . . . . . . . . . . . . . . . . . . .. 5-90 5.5.5 Z3 MIXER AND LOCAL OSC 5-92 5.5.6 Z4 AGC AMP 5-94 5.5.7 Z5 AFC AMP 5-96 5.5.8 Z6 AGC AMP, SEARCH AND SPECTRUM 5-98 5.5.9 Z7 LIMITER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-100 5.5.10 Z8 DISCRIMINATOR , 5-102 5.5.11 Z9 DETECTOR AMP 5-104 5.5.12 Z10 RETURN LOSS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . .. 5-106 5.5.13 Zll MARKER AMP 5-108 5.5.14 Z12 MARKER MIXER ' 5-110

-iii

CONTENTS (Cont)

Page

5.5.15 Z13 MARKER OSC 5-112 5.5.16 Z14 MARKER AND AMPL CONTROL 5-114 5.5.17 Z15 MOTHER BOARD 5-116 5.5.18 Z16 REAR PANEL , 5-118

5.6 BB RECEIVER 5-120 5.6.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-120 5.6.2 Troubleshooting of BB RECEIVER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-,-125 5.6.3 Zl PRE AMP AND DG CAL 5-126 5.6.4 Z2 MIXER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-128 5.6.5 Z3 METER CCT " . . . . . . . . . . . . . . . . . . . . . . .. 5-130 5.6.6 Z4 BPF ..' '.. " 5-132 5.6.7 Z5 DG DETECTOR 5-134 5.6.8 Z6 LIMITER 5-136 5.6.9 Z7 DELAY CAL 5-138 5.6.10 Z8 PD AND DC AMP 5-140 5.6.11 Z9 PD AND LOOP FILTER 5-142 5.6.12 Z10 VCO 5-144 5.6.13 Z12 CAL SWITCH 5-147 5.6.14 Z13 MOTHER BOARD 5-148 5.6.15 Z14 TO Z17 LOCAL OSC 5-150

5.7 CRT DISPLAY 5-152 5.7.1 General. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 5-152 5.7.2 Troubleshooting of CRT DISPLAY 5-156 5.7.3 Zl POWER SUPPLY 5-158 5.7.4 Z2 INPUT/OUTPUT CCT 5-160 5.7.5 Z3 SWITCHING SECTION 5-162 5.7.6 Z4 SWITCHING SECTION 5-164 5.7.7 CRT SECTION 5-166

-iv

(Cont)CONTENTS

Page

SECTION 6 COMPONENT LISTS

6.1 INTRODUCTION ......................... 6-1 6.2 ORDERING OF COMPONENTS FOR REPLACEMENT 6-1 6.3 C.L. OF BB GENERATOR 6-5 6.4 C.L. OF IF SWEEP GENERATOR , 6-10 6.5 C.L. OF IF RECEIVER , 6-18 6.6 C.L. OF BB RECEIVER. . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . .. 6-30 6.7 C.L. OF CRT DISPLAY OPERATION SECTIO~ 6-39 6.8 C.L. OF REAR PANEL CONNECTION 6--44

~v-

UST OF FIGURES

Fig. 2.2-1 2.2-2 2.2-3 2.2-4 2.2-5 2.2-6 2.2-7 2.2-8

3.2-1 3.2-2 3.2-3 3.2-4 3.2-5 3.2-6 3.2-7 3.2-8 3.4-1 4.2-1 4.3-1

4.4-1 4.4-2

4.4-3 4.5-1 4.5-2 4.5-3 4.6-1 5.2-1 5.2-2 5.2-3

5.2-4

5.2-5 5.2-6 5.2-7 5.2-8 5.2-9 5.2-10 5.2-11 5.2-12 5.2-13 5.2-14 5.3-1

5.3-2 5.3-3

5.3-4 5.3-5

Pre-Setting of Rear Panel IF to IF Connection View . . . . . . . . Group Delay & Linearity Differential Phase & Differential Gain BB to BB Connection View IF RETURN LOSS Connection View SPECTRUM Connection View " AM/PM CONVERSION COEFFICIENT Connection View . . . . . . . . . . . . . . . . . . . Withdrawal of CRT 1 Withdrawal of CRT 2 Withdrawal of CRT 3 Withdrawal of the Units 1 . . . . . . . . . . .. Withdrawal of the Units 2. . . . . . . . . . .. Withdrawal of the Units 3 . . . . . . . . . . .. Inspection of Interior of Each Unit. . . .. Replacement of the Lamps. . . . . . . .. Circuit Board Circuitry Check Calibration of BB GENERATOR Calibration of IF SWEEP GENERATOR Calibration of IF RECEIVER. . . . . . . .. Calibration of the Center Marker Connection View. . . . . . . . . . . . . . . . . .. Center Marker . . . . . . . . . . . . . . . . . . . .. Calibration of BB RECEIVER. . . . . . . .. CAL Circuit " Linearity (DG) CAL Circuit Calibration of CRT DISPLAY Block Diagram of Equipment. . . . . . . . .. Rear Panel Connection TRANSMITTER REAR PANEL CONNECTION. . . . . . . . . . . . . . . . . . .. RECEIVER REAR PANEL CONNECTION " Troubleshooting Flow Chart 1. . . . . . .. Troubleshooting Flow Chart 2. . . . . . . .. Troubleshooting Flow Chart 3 Troubleshooting Flow Chart 4 Troubleshooting Flow Chart 5 Troubleshooting Flow Chart 6 . . . . . . .. Troubleshooting Flow Chart 7 Connection of the Troubleshooting Troubleshooting Flow Chart 8 Troubleshooting Flow Chart 9. . . . . . . .. BLOCK DIAGRAM OF BB GENERATOR Top Views of BB Generator " " Front, Rear and Bottom Views of BB Generator. . . . . . . . . . . . . . . . . . . . .. BB GENERATOR ZI POWER SUPPLY Component Location. . . . . . . . . . . . . . . . . . . . . . . ..

2-2 Fig. 5.3-6 2-4 5.3-7 2-5 2-5 5.3-8 2-6 5.3-9 2-8 5.3-10 2-10 5.3-11

5.3-12 2-11 5.3-13 3-1 5.3-14 3-1 5.3-15 3-1 5.3-16 3-2 3-2 5.3-17 3-2 5.3-18 3-2 3-3 5.3-19 3-3 5.3-20 4-2

5.3-21 4-4 5.4-1 4-6

5.4-2 4-7 5.4-3 4-7 4-8 5.4-4 4-9 4-9 5.4-5 4-10 5.4-6 5-2 5-3 5.4-7

5.4-8 5-5 5.4-9

5-7 5.4-10 5-9 5.4-11 5-10 5-11 5.4-12 5-12 5.4-13 5-P 5-14 5.4-14 5-15 5.4-15 5-16 5-16 5.4-16 5-17 5.4-17

5-21 5.4-18 5-22 5.4-19

5-22 5.4-20 5-23 5.4-21

5.4-22 5-26

-vi-

ZI POWER SUPPLY 5-27 Z2 BB OSC AND DIVIDER Component Location 5-28 Z2 BB OSC AND DIVIDER (A TYPE) 5-29 Z2 BB OSC AND DIVIDER (B/C TYPE) .. 5-31 Z3 SWEEP CCT Component Location 5-32 Z3 SWEEP CCT 5-33 Z4 BB FILTER Component Location 5-34 Z4 BB FILTER 5-35 Z5 AGC AMP Component Location 5-36 Z5 AGC AMP 5-37 Z6 OUTPUT AMP Component Location 5-38 Z6 OUTPUT AMP 5-39 Z7 MOTHER BOARD Component Location 5-40 Z7 MOTHER BOARD 5-41 BB OSC AND FILTER Component Location 5-42 Z8 TO Zl1 BB OSC AND FILTER 5-43 BLOCK DIAGRAM OF IF SWEEP GENERATOR 5-45 Top View of IF Sweep Generator 5-46 Front, Rear and Bottom Views of IF Sweep Generator 5-46 CIRCUIT DIAGRAM OF IF SWEEP GENERATOR 5-47 Block Diagram 5-50 ZI MIX AND AGC Component Location 5-50 ZI MIX AND AGC 5-51 Z2 IF AMP 5-53 Z3 DIVIDER AND PCD Component Location 5-54 Z3 DIVIDER AND PCD 5-55 Z4 OSC DRIVE CCT Component Location 5-56 Z4 OSC DRIVE CCT , 5-57 Z5 COMPARISON CCT Component Location 5-58 Z5 COMPARISON CCT 5-59 Z6 VIDEO AGC Component Location 5-60 Z6 VIDEO AGC 5-61 Z7 70 MHz/140 MHz X'TAL OSC Component Location 5-62 Z7 70 MHz/140 MHz X'TAL OSC 5-63 Z8 POWER SUPPLY Component Location 5-64 Z8 POWER SUPPLY 5-65 Z9 BRIDGE Component Location 5-66 Z10 DIAL CONTROL Component Location 5-68

LIST OF FIGURES (Cont)

Fig. 5.4-23 Z10 DIAL CONTROL 5-69 Fig. 5.5-27 Z12 MARKER MIXER Component

Location 5-74 5.5-31 Z14 MARKER AND AMPL CONTROL

Location 5-76 5.5-33 Z15 MOTHER BOARD Component

Location 5-78 5.5-35 Z16 REAR PANEL Component

5.4-24 ZII FM OSC Component Location 5-70 Location 5-110 5.4-25 Zl1 FM OSC 5-71 5.5-28 Z12 MARKER MIXER 5-111 5.4-26 Z12 SWEEP OSC Component Location 5-72 5.5-29 Z13 MARKER OSC Component 5.4-27 Z12 SWEEP OSC 5-73 Location 5-112 5.4-28 Z13 BUFFER AMP Component 5.5-30 Z13 MARKER OSC 5-113

5.4-29 Z13 BUFFER AMP " " .5-75 Component Location 5-114 5.4-30 Z14 MOTHER BOARD Component 5.5-32 Z14 MARKER AND AMPL CONTROL 5-115

5.4-31 Z14 MOTHER BOARD " 5-77 Location 5-116 5.4-32 Z15 DIAL SENS CCT Component 5.5-34 Z15 MOTHER BOARD 5-117

5.4-33 Z15 DIAL SENS CCT 5-79 Location : 5-118 5.5-1 BLOCK DIAGRAM OF IF 5.5-36 Z16 REAR PANEL. 5-119

RECEIVER 5-81 5.6-1 BLOCK DIAGRAM OF BB RECEIVER 5-121 5.5-2 Top Views of IF Receiver 5-82 5.6-2 Top Views of BB Receiver 5-122 5.5-3 Front, Rear and Bottom Views of 5.6-3 Front, Rear and Bottom Views of

IF Receiver 5-82 BB Receiver 5-122 5.5-4 IF RECEIVER 5-83 5.6-4 BB RECEIVER 5-123 5.5-5 Z1 HORIZONTAL AMP Component 5.6-5 Z1 PRE AMP AND DG CAL

Location 5-88 Component Location 5-126 5.5-6 ZI HORIZONTAL AMP 5-89 5.6-6 ZI PRE AMP AND DG CAL. 5-127 5.5-7 Z2 INPUT AMP AND AMPL DETECTOR 5.6-7 Z2 MIXER Component Location 5-128

Component Location 5-90 5.6-8 Z2 MIXER 5-129 5.5-8 Z2 INPUT AMP AND AMPL 5.6-9 Z3 METER CCT Component Location 5-130

DETECTOR 5-91 5.6-10 Z3 METER CCT 5-131 5.5-9 Z3 MIXER AND LOCAL OSC 5.6-11 Z4 BPF Component Location 5-132

Component Location 5-92 5.6-12 Z4 BPF 5-133 5.5-10 Z3 MIXER AND LOCAL OSC 5-93 5.6-13 Z5 DG DETECTOR Component 5.5-11 Z4 AGC AMP Component Location 5-94 Location 5-134 5.5-12 Z4 AGC AMP 5-95 5.6-14 Z5 DG DETECTOR 5-135 5.5-13 Z5 AFC AMP Component Location 5-96 5.6-15 Z6 LIMITER Component Location 5-136 5.5-14 Z5 AFC AMP 5-97 5.6-16 Z6 LIMITER 5-137r. 5.5-15 Z6 AGC AMP, SEARCH AND 5.6-17 Z7 DELAY CAL Component

SPECTRUM Component Location 5-98 Location 5-138

SPECTRUM 5-99 5.6-19 Z8 PD AND DC AMP Component

Location 5-106 5.6-26 Z13 MOTHER BOARD Component

Location 5-108 5.6-28 Z14 to Z17 LOCAL OSC Component

5.5-16 Z6 AGC AMP, SEARCH AND 5.6-18 Z7 DELAY CAL. 5-139

5.5-17 Z7 LIMITER Component Location 5-100 Location " 5-140 5.5-18 Z7 LIMITER 5-101 5.6-20 Z8 PD AND DC AMP 5-141 5.5-19 Z8 DISCRIMINATOR Component 5.6-21 Z9 PD AND LOOP FILTER

Location 5-102 Component Location 5-142 5.5-20 Z8 DISCRIMINATOR 5-103 5.6-22 Z9 PD AND LOOP FILTER 5-143 5.5-21 Z9 DETECTOR AMP Component 5.6-23 ZIO VCO Component Location 5-144

Location 5-104 5.6-24 Z10 VCO 5-145 5.5-22 Z9 DETECTOR AMP 5-105 5.6-25 Z12 CAL SWITCH Component 5.5-23 Z10 RETURN LOSS Component Location 5-147

5.5-24 Z10 RETURN LOSS 5-107 Location 5-148 5.5-25 Zl1 MARKER AMP Component 5.6-27 Z13 MOTHER BOARD 5-149

5.5-26 ZII MARKER AMP 5-109 Location 5-150

LIST OF FIGURES (Cont)

Fig. 5.6-29 Z14TOZ17 LOCALOSC 5.7-1 BLOCK DIAGRAM OF CRT

DISPLAY 5.7-2 Front and Rear Views of CRT Display 5.7-3 Top and Bottom Views of Operation

Section (CRT) 5.74 View of CRT Section (CRT) 5.7-5 CRT DISPLAY OPERATION SECTION

SECTION 5.7-6 Z1 POWER SUPPLY Component

Location 5.7-7 Zl POWER SUPPLY

LIST OF TABLES

Table 1.5-1 SPECIFICATIONS 1.5-2 SPECIFICATIONS 1.5-3 SPECIFICATIONS 4.2-1 Calibration of BB Frequency

5-151

5-153 5-154

5-154 5-154

5-155

5-158 5-159

1-2 1-3 1-4 4-3

Fig. 5.7-8

5.7-9 5.7-10

5.7-11 5.7-12

5.7-13 5.7-14

5.7-15

Table 4.2-2 4.5-1 5.1-1

Z2 INPUT/OUTPUT CCT Component Location 5-160 Z2 INPUT/OUTPUT CCT 5-161 Z3 SWITCHING SECTION Component Location 5-162 Z3 SWITCHING SECTION 5-163 Z4 SWITCHING SECTION Component Location 5-164 Z4 SWITCHING SECTION 5-165 Circuit Board of the CRT SECTION Component Location 5-166 CRT SECTION 5-167

Calibration of Sweep Signal 4-3 Specifications of BB Input Signal 4-9 List of Troubleshooting 5-1

-viii

SECTION 1 GENERAL INFORMATION

SECTION 1

GENERAL INFORMATION

1.1 INTRODUCTION

This manual contains service infonnation required to maintain the MICROWAVE SYSTEM ANALYZER ME434A/B/C, ME5l5A/B/C, ME525A/B/C, including performance checks, troubleshooting techniques, adjustment, calibration procedure and repainnent.

1.2 PERIOD OF MAINTENANCE

This test equipment is designed to permit stable perfonnance for a long time. However there are some cases that performance varies due to stresses and secular changes. To use the Test Equipment under the initial condition, perform periodical maintenance and checks. When any trouble occurs, repair it referring to this service manual or contact the service department, ANRITSU.

1.3 ORDERING OF REPAIR PARTS

Ordering of repair parts should be made as

mentioned in item 6.2.

1.4 DISTINCTION BETWEEN PERFORMANCE CHECK AND CALIBRATION

Method of checking if the test equipment operates nonnally or not.

CD As mentioned in Section 2, check if the all functions are performed normally or not.

G) Calibration of levels and frequencies should be made referring to Section 4.

I.S SPECIFICATION

The specifications of this test equipment are given in Tables 1.5-1, 1.5-2 and 1.5-3.

-------

Table 1.5-1 SPECIFICATIONS

Measurements

ME434A/B/C ME515A/B/C ME525A/B/C

70 MHz band 140 MHz band 70 MHz band 140 MHz band

35 to 105 MHz 105 to 175 MHz 35 to 105 MHz 105 to 175 MHz

o to t35 MHz

45 to 95 MHz r35 to 105 MHz 115 to 165 MHz 1105 to 175 MHz 45 to 95 MHz I 35 to 105 MHz 115 to 165 MHz 1105 to 175 MHz to.05 dB to. I dB D.05 dB to. I dB D.05 dB D. I dB D.05 dB D. I dB r

0.1 dB/em

+5 dB )

20 dB ( 0 to -15 dB 40 dB (through RETURN LOSS input terminaL inherent slope I dB)

50 to 90 MHz I 40 to 100 MHz 1120 to 160 MHz 1110 to 170 MHz 50 to 90 MHz I 40 to 90 MHz 120 to 160 MHz I 110 to 170 MHz I I0.3 ns 0.5 ns 0.3 n. 0.5 ns 0.3 ns 0.5 ns 0.3 ns 0.5 ns

0.3 ns/cm

200 ns

0.1 ns rms

Modulation frequency: 200 kHz (type A), 277 kHz (type B), 250 kHz (type C) Frequency deviation: 200 kHz rms Bandwidth: I kHz

50 to 90 MHz I 40 to 100 MHz 120 to 160 MHz 1110 to 170 MHz 50 to 90 MHz I 40 to 90 MHz 120 to 160 MHz I 110 to 170 MHz I0.4' 0.5' 0.4' 0.5' 0.4' 0.5' 0.4' 0.5'

O.I'/cm

20'

O.lL rms

Modulation frequency: 2 MHz (ME434A/ME515A/ME525A), :0 5.6 MHz (Optional BB frequency) Frequency deviation: 500 kHz rms Bandwidth: I kHz '1: frequency range = sweep width + 2 BB frequency

50 to 90 MHz I 40 to 100 MHz 120 to 160 MHz 1110 to 170 MHz 50 to 90 MHz I 40 to 100 MHz 120 to 160 MHz 1110 to 170 MHz 0.2% 0.4% 0.2% 0.4% 0.2% 0.4% 0.2% 0.4%I

0.03%/cm

75%

O.I%rms

Frequency deviation 200 kHz rms at modulation frequency of :0 555 kHz Frequency deviation 500 kHz rms at modulation frequency of ~ 2 MHz Bandwidth: I kHz '2: frequency range =sweep width + 2 BB frequency

I dB/cm

10 to 50 dB

~ 54 dB/70, 140 35 MHz

70 MHz 140 MHz 70 MHz 140 MHz

-51 to +11 dBm

Type A: measures the BB level when the frequency deviation is set at 170 kHz rms (confirmed by the disappearance of the carrier by means of SPECTRUM when the modulated frequency is 100 kHz and modulation index is 2.4 radians).

Type B: measures the BB level when the frequency deviation is set at 157 kHz rms (confirmed by the disappearance of the carrier by means of SPECTRUM when the modulated frequency is 92.593 kHz and the modulation index is 2.4 radians).

Type C: measures the BB level when the frequency deviation is set at 142 kHz rms (confirmed by the disappearance of the carrier by means of SPECTRUM when the modulated frequency is 83.333 kHz and the modulation index is 2.4 radians).

40 to 100 MHz 110 to 170 MHz 40 to 100 MHz 110 to 170 MHz

-51 to +6 dBm

Type A: measures the BB level when the IF signal of frequency deviation of 170 kHz rms (confirmed by the disappearance of the carrier by means of SPECTRUM when the modulated frequency is 100 kHz, and the modulation index is 2.4 radians) is demodulated.

Type B: measures the BB level when the IF signal of frequency deviation of 157 kHz rms (confirmed by the disappearance of the carrier by means of SPECTRUM when the modulated frequency is 92.593 kHz, and the modulation index is 2.4 radians) is demodulated.

Type C: measures the BB level when the IF signal of frequency deviation of 14i kHz rms (confirmed by the disappearance of the carrier by means of SPECTRUM when the modulated frequency is 83.333 kHz, and the modulation index is 2.4 radians) is demodulated.

Frequency 45 to 95 MHz 115 to 165 MHz 45 to 95 MHz 115 to 165 MHz Measurement ~M/PM I Residual PM'3 0.3 conversion AM modulation frequency: 200 kHz 4f (type A), 277.778 kHz 4f (type B), 250 kHz 4f (type C) 4f: about 500 Hz

Measuring conditions AM modulation factor: 10% Note: 3 The value of the sum of the reception and transmission.

Inherent slope Noise

Group delay

Max. measuring range Maximum sensitivity

0.1 ns rms

Differential phase

200 ns 0.1 ns 0.3 ns/cm

O.I'rms20'O.I'/cm

BB-BB I Li~earity and differential I 0.1 ) I I0.1% 0.03%/cm 75% O.I%rmsmeasurement gain Measuring Level: -20 dBm conditions Bandwidth: "i kHz

Power 100 V'4 tlO%, 50/60 Hz, :0 180 VA

Dimensions and Weight Receiver: 195 H, 426 W, 450 Dmm, '" 25 kg Transmitter: 102 H, 426 W, 450 Dmm, :0 15 kg

'4: A nominal AC line voltage is provided on request between 100 and 250 V.

The following cameras and camera mounting device can be used with the Microwave System Analyzer. Hewlett Packard: Model198A, 195A, 197A cameras, and 123A camera with 10369A adapter. Iwatsu Electric: UP-8 carnera mounting device.

1-2

Table 1.5-2 SPEC1FICAnONS

IF SWEEP GENERATOR

For 10/140 MHz Bands IF SWEEP GENERATOR For 10 MHz Band For 140 MHz Band

10 MHz 140 MHz

Frequency 35 to 105 MHz 105 to 115 MHz 35 to 105 MHz 105 to 115 MHz

Frequency accuracy (center) 0.5 MHz 1 MHz to.5 MHz 1 MHz

Frequency stability 100 kHz/5 hrs after 30 min. warm up

200 kHz/5 hrs after 30 min. warm up

100 kHz/5 hn after 30 min. warm up

200 kHz/5 hrs after 30 min. warm up

IF OUTPUT Level -11 to +11 dBm

Level accuracy to.5 dB at +10 dBm output 1 dB at level except +10 dBm output

Relative harmonic content ::> -30 dB

Output impedance: 15 II 45 to 95 MHz 1 40 to 100 MHz 115 to 165 MHz 1110 to 110 MHz 45 to 95 MHz I40 to 100 MHz 115 to 165 MHz 1110 to 110 MHz (Return loss) ~ 30 dB I

Table 1.5-3 SPECIFICAnONS

BB GENERATOR

Frequency

Type A: Type B: Type C: Option:

100 kHz, 200 kHz, and 2 MHz 92.593 kHz, 277.778 kHz, and 555.556 kHz 83.333 kHz, 250 kHz, and 500 kHz 2.4 MHz, 3.58 MHz, 4.43 MHz, 5.6 MHz, 8.2 MHz, and 12.39 MHz (Type A: up to 3 optional BB frequencies; Type B/C: up to 4 optional BB frequencies)

BB OUTPUT Frequency accuracy

Level

S x 10-6

-51 to +11 dBm

Level accuracy O.S dBm at +10 dBm

Relative harmonic content ;:;;; -40 dB

Source impedance 75 0, return loss: ~ 30 dB

SWEEP OUTPUT

Frequency

Level

Line (SO or 60 Hz) and 18 Hz o to 6.5 Vp-p across 750 load, 0 to 30 Vp-p across 10 kO load

BB + SWEEP OUTPUT The same specifications as BB OUTPUT and SWEEP OUTPUT

EXT BB INPUT

Frequency

Level

Impedance

SO kHz to 12.39 MHz

odBm

750, return loss: ~ 26 dB

EXT SWEEP INPUT

Frequency

Level

Impedance

18 to 100 Hz

I Vp-p

~ I kO

BB RECEIVER

BB INPUT

Frequency SO kHz to 12.39 MHz

Level -51 to +6 dBm

Level accuracy O.3 dB at 0 dBm

Impedance 75 0, return loss: ~ 26 dB

Group delay and differential phase

Frequency

Type A: 100 kHz, 200 kHz, and 2 MHz Type B: 92.593 kHz, 277.778 kHz, and 555.556 kHz Type C: 83.333 kHz, 250 kHz, and 500 kHz Option: 2.4 MHz, 3.58 MHz, 4.43 kHz, 5.6 MHz, 8.2 MHz, and 12.39 MHz

(Type A: up to 3 optional BB frequencies; Type B/C: up to 4 optional BB frequencies)

S Hz at ;;; 555.556 kHz S x 10-6 at ;;; 10 MHz 3 x 10-6 at ~ 12.39 MHz

Phase capture range

CALIBRATION DELAY: 3 ns, 10 ns, and 30 ns DP: 1 and 3

S%

180 Hz, 400 Hz, I kHz, and 3 kHz

Accuracy

Detection bandwidth

Frequency SO kHz to 12.39 MHz linearity and CALIBRATION 0.3, I, 3, 10, and 100% differential gain Accuracy S%

180 Hz, 400 Hz, I kHz, and 3 kHz Detection bandwidth

BB OUTPUT Frequency SO kHz to 12.39 MHz (FOR RETURN) Level o dBm

BB Return Loss Bridge

IOt047dB

~ 55 dB (loo kHz to 20 MHZ), Measuring range

Bridge balance ~ SO dB (20 to 30 MHz)

1--4

l

SECTION 2

PERFORMANCE CHECKS

2.1 INTRODUCTION

The check that the equipment meets the specifications. These checks may be used for incoming inspection after repair of the instrument, after performing the alignment procedure, or for periodic calibration.

If a function fails to operate, go to SECTION 4 or 5. Performance Checks

(1) Pre-Setting of Rear Panel

(2) IF to IF (3) BB to BB (4) IF RETURN LOSS (5) SPECTRUM (6) AM/PM CONVERSION COEFFICIENT

2.2 PERFORMANCE CHECKS

Performance checks should be made in compliance with the following items (1) to (6).

2-1

-----

--..

(1) Pre-Setting of Rear Panel Before performance checks, it is necessary to make presetting as mentioned below.

Fig. 2.2-1 Pre-Setting of Rear Panel

--.

56004

CD HOR MODE INT (When the transmitter and the receiver are power supplied from the same single AC source, it is convenient to leave it set to LINE).

(}) AMPL INPUT INT. c}) RET LOSS INPUT INT. I ---.. 0 eD

HOR SELECT

MARKER SELECT

IF.

IF.

eD IF BAND Required band. (for ME525A/B/C) IF INPUT MODE 140 MHz. (for ME515A/B/C)

(J) THRESHOLD EXTENSION OFF. (Set to ON when there is much noise in IF input signal.)

PLL CUT FREQ HIGH. Set to LOW when sweeping at 18 Hz. @

IF BAND

FM MODE

Required band. (for only ME525A/B/C)

NORMAL.

2-2

-z:

3.LON

(2) IF to IF

--..

56003

Fig. 2.2-2 IF to IF Connection View ---.

Set the controls as follows.

CD (DD-G) CD (DB-G) 0) (IF-G)

CD ([F-G) CD (I ['-G) (I ['-G) (j) (BDR) (BB-R) (CRT) @ (CRT) @ (BB-R) @ (IFR) @ (IF-R) @ (IF-R) @ ([F-R)

@ (CRT)

@ (rF-R)

@ (CRT) @ (DD-R)

@ (BB-R)

DB FREQ

SWEEP FREQ

I'M DEVIATION

SWEEP CENTER

SWEEP WIDTH

IF OUTPUT LEVEL

INPUT

DB FREQ

BLANKING

CALIBRATION

DETECTOR BAND

INPUT LEVEL

AFC OPERATE

MARKER MODE

MARKER COMB DIVISION

HORIZONTAL PHASE

MARKER CHECK

BLANKING

BB INPUT LEVEL

PHASE LOCK OPERATE

RequiJed frequency.

50(60) Hz.

Set to 200 kHz rms when DD frequency is 1 MHz or less. Set to 500 kHz rms when BD frequency is 1 MHz or more.

70 MHz/140 MHz.

tOO MHz - BB FREQ).

+10 dBm.

IF.

Sel to same frequency as BB FREQ of BB Generator.

Push OFF.

OFF.

1kHz.

+10 dBm.

Confirm lamp lights.

A.

Required division. 1, 5 or 10 MHz.

Adjust the knob to put the tracing marker pulse upon the retracing marker pulses coincidently.

Push on. It is normal, if the right side of marker pulse rows on CRT goes ofr. If the left side goes off, invert by means of INV..E.RT switch and correct the phase by using No. (16).

Push 0

Set so the needle of BB INPUT LEVEL meter fans within the scale. - 16 dBm.

Lamp lights when phase lock operates normally.

-.

2-4

SECTION 2 PERFORMANCE CHECKS

IF LEVEL (a) If the difference between IF OUTPUT LEVEL and

IF INPUT LEVEL is less than (I dB + *cable loss), IF level is normal.

*Cable Loss Cable Length: 2 m

-------70 MHz approx. 0.2 dB

140 MHz approx. 0.4 dB

IF AMPLITUDE (a) (CRT) DISPLAY YI AMPL.

DISPLAY Y2 CLEAR. (b) (CRT) CALIBRATION Turn ON to DISPLAY

Yl side. (c) Amplitude calibration - When the (CRT)

CALIBRATION is turned ON, two amplitude image will appear. Set the value between these two images with the AMPL CAL 1 dB, and adjust the distance between two images to the scale with AMPL GAIN.

(d) Confirmation; Check the characteristic by referring to Table 1.5-1 SPECIFICATIONS.

GROUP DELAY & LINEARITY (a) (BB-G) BB FREQ Set as follows:

Type A 100 kHz, 200 kHz

Type B 93 kHz, 277 kHz, 556 kHz

Type C 83 kHz, 250 kHz, 500 kHz

(b) (CRT) DISPLAY Yl DELAY DP. (c) (CRT) CALIBRATION Turn ON to DISPLAY

Yl side. (d) Group delay calibration - When the (CRT)

CALIBRATION is turned ON, two delay images will appear. Set the value between these two images with the DELAY CAL 10 ns, and adjust the distance between two images to the scale with DELAY DP GAIN.

Sens: Delay: I ns/div BB Freq.: 200 kHz Linearity: O.I%/div IF Freq.: 70 30 MHz

Fig. 2.2-3 Group Delay & Linearity

(e) Confirmation; Check the characteristics by referring to Table 1.5-1 SPECIFICATIONS.

(D (CRT) DISPLAY Y2 LINEARITY DG. (g) (CRT) CALlBRATION Turn ON to DISPLAY

Y2 side. (h) Linearity calibration When the (CRT)

CALIBRATION is turned ON, two linearity images will appear. Set the value between these two images with the LINEARITY (DG) CAL 1%, and adjust the distance between two images to the scale with the LINEARITY (DG) GAIN.

(i) Confirmation; Check the characteristics by referring to Table 1.5-1 SPECIFICATIONS. Fig. 2.2-3 shows an example of the characteristics.

Differential Phase & Differential Gain (a) (BB-G) BB FREQ Set to BB higher freq.

(2 M to 5.6 MHz) (b) (CRT) DISPLAY Yl DELAY DP. (c) (CRT) CALIBRATION Turn ON to DISPLAY

Yl side. (d) Differential phase calibration - When the (CRT)

CALIBRATION is turned ON, two differential phase images will appear. Set the value between these two images with the DP CAL 1 , and adjust the distance between two images to the scale with DELAY DP GAIN.

(e) Confirmation; Check the characteristics by referring to Table 1.5-1 SPECIFICATIONS.

(D (CRT) DISPLAY Y2 LINEARITY DG. (g) (CRT) CALIBRATION Turn ON to DISPLAY

Y2 side. (h) (Linearity) differential gain calibration - When the

(CRT) CALIBRATION is turned ON, two differential gain images will appear. Set the value between these two images with the LINEARITY (DG) CAL 1%, and adjust the distance between two images to the scale with LINEARITY (DG) GAIN.

(i) Confirmation; Check the characteristics by referring to Table 1.5-1 SPECIFICATIONS. Fig. 2.2-4 shows an example of the characteristics.

Dp

OG

Sens DP: O.IO/div BB Freq.: 2 MHz DG: O.I%/div IF Freq.: 70 28 MHz

Fig. 2.2-4 Differential Phuse & Differential Gain

(3) BB to BB

Fig. 2.2-5 BEl to BB Connection View

Set the controls as follows.

CD (BB-G) BB FREQ Required frequency. CD (BB-G) SWEEP FREQ 50(60) Hz. CD (BB-R) INPUT BB. CD (BB-G) BB OUTPUT LEVEL -20 dBm. CD (BB-R) BB INPUT LEVEL -20 dBm. (BB-R) BB FREQ Set to same frequency as BB FREQ of BB-G.

The other settings are the same as was the case with IF to IF.

BB LEVEL CALIBRATION is turned ON, two delay images If thc difference between BB OUTPUT LEVEL and will appear. Set the value bctween these two

BB INPUT LEVEL is less than 0.8 dB, BB level is images with the DELAY CAL 10 ns, and adjust normal. the distance between two images to the scale with

DELAY DP CAIN. GROUP DELAY & LINEARITY (e) Confirmation; Check the characteristics by (a) (BB-C) BB FREQ Set as follows: referring to Table 1.5-1 BB-BB SPECIFICATIONS.

Type A 100 kHz. (f) (CRT) DISPLAY Y2 LINEARITY DC. 200 kHz (g) (CRT) CALIBRATIO Turn ON to DISPLAY

Type B 93 kHz, Y2 sidc. 277 kHz, (h) Linearity calibration - When the (CRT) 556 kHz CALIBRATION is turned ON, two linearity images

Type C 83 kHz, will appear. Set the value between these two 250 kHz, images with the LINEARITY (DC) CAL 1%, and 500 kHz adjust the distance between two images to the

(b) (CRT) DISPLAY YI DELAY DP. scale with the LINEARITY (DC) CAIN. (c) (CRT) CALIBRATION Turn ON to DISPLAY (i) Confirmation; Check the characteristics by

YI side. referring to Table I .5- I BB-BB SPECI FICATIONS. Cd) Group delay calibration - When the (CRT)

2-6

56003

Differential Phase & Differential Gain (a) (BB-G) BB FREQ Set to BB higher freq.

(2 M to 12.39 MHz) (b) (CRT) DISPLAY YI DELAY DP. (c) (CRT) CALIBRATION Turn ON to DISPLAY

YI side. (d) Differential phase calibration - When the (CRT)

CALIBRATION is turned ON, two differential phase images will appear. Set the value between these two images with the DP CAL I ,and adjust the distance between two images to the scale with DELAY DP GAIN.

(e) Confirmation; Check the characteristics by

referring to Table 1.5-1 BB-BB SPECIFICATIONS. (t) (CRT) DISPLAY Y2 LINEARITY DG. (g) (CRT) CALIBRATION Turn ON to DISPLAY

Y2 side. (h) (Linearity) differential gain calibration - When the

(CRT) CALIBRATION is turned ON, two differential gain images will appear. Set the value between these two images with the LINEARITY (DG) CAL 1%, and adjust the distance between two images to the scale with LINEARITY (DG) GAIN.

(i) Confirmation; Check the characteristics by referring to Table 1.5-1 BB-BB SPECIFICATION.

2-7

(4) IF RETURN LOSS

JfoQ

OUTPUT

~ r~~sE1~rteE ~ ~~8H

INPUT

Fig. 2.2-6 IF RETURN LOSS Connection View

Pre-setting

CD (IF-G) SWEEP CENTER 70 M}fz!140 MHz. 0 (IF-G) SWEEP WIDTH 35 MHz. CD (IF-G) OUTPUT LEVEL +10 dBm. CD (CRT) BLANKING Push OFF. CD (CRT) CALIBRATION OFF. CD (CRT) DISPLAY YI Push RET LOSS on. CD (CRT) DISPLAY Y2 CLEAR. -

Calibration

CD (IF-R) (IF-R) @ (IF-R) @ (IF-R)

@ (CRT)

@ (IF-R)

@ (CRT) @ (BB-R) @ (IF-R)

IF INPUT LEVEL

AFC OPERATE

MARKER MODE

MARKER COMB DIVISION

HORIZONTAL PHASE

MARKER CHECK

BLANKING

DETECTOR BAND

RETURN LOSS

-10 dBm.

Confirm lamp Lights.

A.

Required division. I, 5 or 10 MHz.

Adjust the knob to put the tracing marker pulses upon the retracing marker pulses coincidently.

Push on. If the right side of the maiker pulse rows on CRT goes off, it is normal. If the left side goes off, invert by means of INVERT switch and correct the phase by means of No. @. Push ON.

3 kHz.

20 dB. (20 dB STD should be connected to bridge.)

2-8

56003

SECTION 2 PERFORMANCE CHECKS

(Cant)

@ (CRT) VERTICAL POSITION Align base line with center of scale on CRT screen.

@ (IF-R) RETURN LOSS Vary between 15 dB and 25 dB. (Confirm that the image coincides wi~fuU scale. When it is not coincident, adjust No. @.

@ (IF-R) RET LOSS GAIN For calibration of return loss scale.

Confirmation; Check by referring to the Return loss on IF band characteristics of Table 1.5-1 SPECIFICATION.

(5) SPECTRUM

56003

Fig. 2.2-7 SPECTRUM Connection View

Set the controls as follows:

I CD (IF-R) IF INPUT LEVEL +10 dBm (3) (CRT) DISPLAY Y1 CLEAR CD (CRT) DISPLAY Y2 SPECTRUM CD (CRT) BLANKING Push OFf' CD (CRT) CALIBRATION OFF CD (If'-R) MARKER MODE Of'r (j) (If'-R) SPECTRUM WIDTH About 0.5 MHz (IF-R) CENTER ADJ Sct so signal comes to center of CRT screen (CRT) HORIZONTAL PHASE Adjust the knob to put the tracing marker pulses

upon the retracing marker pulses coincidently.

@ (CRT) BLANKING Push ON

Confirmation; Check the SPECTRUM WIDTH, CENTER ADJ and SPECTRUM GAIN.

---,

2~10

(6) AM/PM CONVERSION COEFFICIENT (confmnation of residual PM)

Osdlhl.lor

200 kHz ~ 300 kHz: -10 dBm

,........

175 Qj OUTPUTIN.:UT I I

\ 'AM INPUT ___ (1F-G Rear panel)

Fig. 22-8 AM/PM CONVERSION COEITICIENT Connection View

Set the controls as follows.

Obje~l Ilcing MCllSUrcd

Connect for measurement

freq

Ic\'cl

CD

CD CD 0

@ (j) @ @ @ C@ @ @ @ @ @

I

(BB-G)

(BB-G)

(IF-G)

(IF-G)

(IF-G)

OF-G)

(IF-G)

(IF-G)

(BB-R)

(BB-R)

(CRT)

(CRT)

(BB-R)

(IF-R)

(IF-R)

OF-R)

Of--R)

BB FREQ

SWEEP FREQ

AM MOD INDEX (rear panel)

AM INPUT (rear panel)

FM DEVIATION

SWEEP CENTER

SWEEP WIDTH

IF OUTPUT LEVEL

INPUT

BB FREQ

BLANKING

CALIBRATION

DETECTOR BAND

INPUT LEVEL

AFC OPERATE

MARKER MODE

MARKER COMB DIVISION

Set as follows: Type A: 200 kHz Type B: 277 kHz Type C: 250 kHz

50(60) Hz.

10%

Connect an external signal frequency: (BB about 500 Hz) level: (-10 dBm)

200 kHz rms.

70 MHz/l40 MHz.

25 MHz.

+10 dBm.

IF.

Same frequency as BB FREQ of BB Generator.

Push OFF.

OFF.

3 kHz.

+10 dBm.

Confirm lamp lights.

A.

Required division. I, 5 or 10 MHz.

I

2-11

56003

(Cont)

@ (CRT)

@ ((F-R)

@ (CRT) @ (BB-R)

@ (BB-R)

HORIZONTAL PHASE

MARKER CHECK

BLANKING

BB INPUT LEVEL

PHASE LOCK OPERATE

Adjust the knob to put the tracing marker pulses upon the retracing marker pulses coincidently.

Push on. If the right side of the marker pulse rows on CRT goes off, it is normal. If the left side goes off, invert by means of INVERT switch and correct phase by means of No. @. Push ON.

Set so the needle of BB INPUT LEVEL meter falls within the scale.

Lamp lights when phase lock operates normally.

Performance Check (The IF OUTPUT is connected to IF INPUT.)

(a) (CRT) DISPLAY DELAY DP. (b) (BB-R) DELAY CAL 10 ns. (c) (CRT) CALIBRATION Turn on to DlSPLA Y

Yl side. (d) (BB-R) DELAY DP

GAl Adjust the distance between two images to the scale.

(e) Confirmation; The beat wave such as is shown below, will appear on the CRT screen. When the amplitude is great,S os (0.3 deg/dB) or more, t11e amplitude should be adjusted lower, using the PIN BIAS on the rear panel of the IF Sweep Generator.

AMPLITUDE-r L~l/VV\rl;:;;,DISTANCE rvvvv

AM-PM conversion value The beat wave such as is shown below, will appear

on the CRT screen. By substituting the value "(sec) from the image into the equation below, the AMPM conversion value Kp (degrees/dB) can be derived.

r . Lf F Kp = 61.094 x mAM [deg/dB)

where .

SECTION 3

PREPARATION OF REPAIR

3.1 INTRODUCTION (2) Remove four screws with an asterisk (*), lower the piece installed on the handle in the

This section will explain method of disassembling direction of the arrow, withdraw the upper part the equipment and each unit, and instruments for of the left side cover Q), and pull the lower repair and calibration. part out.

3.2 DECOMPOSITION (3) Pull out two green connectors G) underneath the large printed circuit board installed on the

3.2.1 Withdrawal of CRT of CRT Display left side of the CRT.

(1) Remove four screws with a mark * and remove (4) Take out four screws with a mark *. the top cover CD.

56422 Fig. 3.2-1 Withdrawal of CRT 1

(5) Hold the CRT in your hand from the left side, and remove two screws which are fastening the piece on the upper rear section.

Take OrrSC1CWS.

Fig. 3.2-2 Withdrawal of CRT 2

(6) Pull the CRT out toward you by holding the left side and the front side in your hands.

PuU CRT toward 0 you.

Fig. 3.2-3 Withdrawal of CRT 3

3-1

3.2.2 Withdrawal of the Units IF Receiver, BB Receiver, IF Sweep Generator and

BB Generator may respectively be withdrawn by the same procedure.

(I) Withdraw the four screws with an arrow which are fastening the front panel of a unit. In removing the IF Sweep Generator, for instance, withdraw four screws with a mark *. (See Fig. 3.2-4.)

a\ ;'-11i- I 'f I I~ . ,oJ ,

56003

Fig.3.2-4 Withdrawal of the Units I

(2) Take out screws indicated with an arrow which are fastening the rear panel. (See Figure 3.2-5.)

56004

Fig. 3.2-5 Withdr,twal of the Units 2

3-2

(3) Remove the coaxial connector and the multicon tact connector which are attached on the rear of the unit, and then remove four screws wi th an arrow. When removing the last screw, hold the plate to which the connector is attached in your hand to keep the unit from falling, and pull the unit out toward you. (See Fig. 3.2-6.)

56427 ,-

Fig. 3.2-6 Withdrawal of the Units 3

3.2.3 inspection of interior of Each Unit Remove screws with an arrow, and withdraw the

top cover. (See Fig. 3.2-7.) Notes:During assembly, take the reverse of

disassembly.

56442

Fig. 3.2-7 Inspection of Interior of Each Unit

3.2.4 Replacement of the Lamps The lamps are installed behind the Bezel, and thus

in order to replace the lamps, first remove the screws with an arrow shown in Fig. 3.2-8, and withdraw the Besel.

Since the lamps are connected in series, none of the lamps will light even if only one of them is out of order. Confirm which lamp is defective, and remove that lamp by turning it according to the threads on the lamp socket.

0...1

56005

Fig. 3.2-8 Replacement of thc Lamps

3.3 INSTRUMENTS FOR REPAIR AND CALIBRATION

(1) Accessories for Repair and Calibration CD Circuit board for connection

(a) For IC Sweep Generator (432U14568)

I'" r. I ".r

' {: I ~

56459

(b) For BB Generator, BB Receiver and IF Receiver (432Ul4567)

56459

(1) Cable for connection 27DP-P-l.5 --27DP-BJ-1.5 @ MP2.5CP - MP2.5CPJ @ HRM-202B - HRM-208B @ 27DP-P-1.5(UMP) - BNCJ

3-3

o MP-2.5CP -- 3CWP CD KC-LP008--3CWP HRM-208B--3CWP

(2) Instruments for Repair and Calibration

lru:trument Application Rcmuks VoJlmc!cr uc. AC{UNEl Voltage rnUlLm.'fJIl.'nl 05dllo,~'op-: W;jVt:from ob'i\:n-alioll for DC 10 20 MHz Frcqu('nc:r BB """ 10 H, '" " "H, I I",",,,,, co,",,, counter If ran~c 35 MIl,. II) 175 Ml-b ~lP 62

Rl r~r.!?c 700 MHz to 1 Glh tANRITSU) L('I'cl meter BB fang!' 10 Hz \0 18 .\IHz Level meter ML5SH (ANRlTSUj

II range' 35 \1117. to 175 MHl Ucctronic Voltmeter ML69A (ANR/TSU) RI [Jill!': 700 MHz to 1 GHz Level mder ML712!\ + MP610A

(.~NRITSU) f"IL'clroniL: Voltmeter ML69A(lANRITSU)

Sir,OJI gem:ralor I ~m r:lll"C 10 Hz \0 18 MHI Si~nnl l1encr:lIOr MG426A (ANRITSU) Signlll g.:n..:wlor MG525A (ANRITSU)If ralte: J,s MHz 10 175 "'Hi:

RF rarc~": 700 ~lH'l 10 1 GH1. SI~nJI I;t"n",nllol ,\1(;639A [ANRITSU)

3.4 CHECK OF CIRCUIT BOARD OF EACH UNIT

With the circuit board out of the frame, check the circuit board for its circuitry by the use of a circuit board for connection as shown in Fig. 3.4-1.

(a) Transmitter

(b) IF Receiver

Fig. 3.4-1 Circuit Board Circuitry Check

56425

SECTION 4

CALIBRATION

4.1 INTRODUCTION

In this section, the methods of output level setting for each unit and input calibrating of level meter are described.

Internal Deviation; Because the amplifier and the mixer of the present

measuring equipment are designed for wide bands, the equipment is not equipped with the equalizers of Delay (DP), Linearity (DC), AMPL and Return loss. When problems with components occur, loose contact

of the printed circuit boards, cable, etc. are the increase in internal deviation. Consequently, calibration is unnecessary.

Calibration of Delay (DP), Linearity (DG), Ampl; Accuracy of these calibrations do not vary unless

parts are damaged or surrounding circuits are deteriorated. Therefore, as a rule, There is no need to make calibrations. In case a trouble occurs, replace the faulty part in compliance with the procedures mentioned in Section 5 Repair.

4-1

-----

4.2 BB GENERATOR generator shown in Fig_ 4_2-1 will appear, and the following calibrations can be made by regulating the

Remove the top plate of transmitter unit. Then BB variable resistors shown in Fig. 4.2-1.

ZI-R21

-

~,

---,

Z3-R12 50(60) Hz Sweep Level Adj.

Z3-R4 18 Hz Sweep Freq Adj.

Z3-R8 18 Hz Sweep Level Adj.

Meter Zero Adj.

Z3-R33 Meter Sense Adj.

Z3-R39

Z5-R38

~ ,~

56445 (b)

.Fig. 4.2-1 Calibration of BI:l GENERATOR

4-2

4.2.1 BB OUTPUT SIGNAL Setting control knobs provided on the front panel

of the BB Generator. CD BB FREQ: Set in accordance with

frequency to be measured.

Q) BB LEVEL ADJ: Set at 0 dB on BB OUTPUT LEVEL meter.

Q) BB OUTPUT LEVEL dBm: 0 dBm

Next, connect the frequency counter or the level meter to the BB OUTPUT terminal for the measurement of BB signal. The specifications for frequency and points requiring calibration are indicated below:

(1) Frequency

Table 4.2-1 Calibration of DB Frequency

~ Frequency Allowance of Frequency Poin Is Req uiring Calibra tion Type A 100 kHz 0.5 Hz Refer to Section 5.3.4 (Z2).

200 kHz 1 Hz

IO Hz2 MHz

Type B 92.593 kHz 0.46 Hz Same as above.

277.778 kHz l.4 Hz

2.8 Hz555.556 kHz

Type C 83.333 kHz 0.4 Hz Same as above.

250 kHz 1.2 Hz

500 kHz 2.5 Hz Option 2.4 MHz 12 Hz Refer to Section 5.3.10 (Z8 to Zll).

3.58 MHz J8 Hz

4.43 MHz 22 Hz

5.6 Mllz 28 Hz

8.2 MHz 41 Hz

1239 MHz 60 Hz

(2) Output Level: Specification: O.S dB Z5-R38.) Method of calibration:

CD BB LEVEL ADJ: Set output at 0 dBm 4.2.2 SWEEP OUTPUT signal (Read the value on a level Setting control knobs on the front panel of the BB meter.) Generator.

(1) Meterzero CD SWEEP FREQ: 18 Hz or LINE setting: Set at zero (Set by Q) SWEEP LEVEL: To the full clockwise

Z5R33.) Next, connect the frequency counter or the G) BB LEVEL oscilloscope to the SWEEP OUTPUT terminal for the

ADJ: Set output at +1 dBm. measurement of the level and frequency. The @ Metersensitivity specifications and points requiring calibration are

setting: Set at +1 dB. (Set by indicated below:

Table 4.2-2 Calibration of Sweep Signal

~ Sweep Signal Specification Points Requiring Calibration Remarks Frequency 18 Hz Within

0.18 Hz Z3-R4 Refer to Fig. 4.2-1.

LINE - -

Level 18 Hz 30 Vp-p or higher (load: 10k )

Z3-R37 Same as above.

I

LINE

4.2.3 BB + SWEEP OUTPUT signal signal and SWEEP OUTPUT signal for items 4.2.1 and Perform calibration as in the case of BB OUTPUT 4.2.2 above.

4-3

I

4.3 IF SWEEP GENERATOR sweep generator shown in Fig. 4.3-1 will appear. -"'\

Calibrations can be made by adjusting variable Remove the top and the sole covers. Then, IF resistors shown in Fig. 4.3-1.

. 'r..~I"'"'' ~ I ~J_'

Z5R13

Z4RJO

Z5R32 SWEEP WIDTH Adj.

Z415 Meter Zero Adj.

Z420 Meter Sense Adj.

56442 (b)

....--.,.

--.

ZIO

SWEEP CENTER Adj 56440

rig.4.3-1 Calibration of IF SWEEP GENERATOR

4-4

4.3.1 IF OUTPUT LEVEL Meter CD Set SWEEP WIDTH MHz and FM

DEVIATION kHz rms at "0". (2) Set IF OUTPUT LEVEL dBm at "0". G) Connect the power meter to IF OUTPUT

terminal. @ Adjust by means of IF LEVEL ADJ so that

the power meter reads 0 dBm. (5) Adjust Z4R15 so that the pointer of IF

OUTPUT LEVEL meter indicates 0 dB. Confirm that the IF OUTPUT level meter

indicator changes by I dB when the level indicator of the power meter is changed by I dB by using IF LEVEL ADJ. If not, regulate meter sensitivity by means of Z4R20.

4.3.2 IF SWEEP CENTER Frequency Values in ( ) are for 140 MHz band.

CD Set SWEEP WIDTH MHz and FM DEVIATION kHz rms at "0".

CV Connect the frequency counter to IF OUTPUT terminal.

G) With SWEEP CENTER MHz set at 40 MHz (110 MHz) adjust ZI0R8(R9) so that the frequency registers 40 MHz (110 MHz).

@ With SWEEP CENTER MHz set at 100 MHz (170 MHz), adjust ZI0.R5(R4) so that the

frequency registers 100 MHz (170 MHz). G) Setting of item G) will deviate slightly when

item @ is performed. Consequently, adjustment of items G) and should be made alternately so that both items Q) and are performed.

Notes: Refer to Section 5.4.12 (ZlO).

4.3.3 SWEEP WIDTH CD Set SWEEP WIDTH MHz at 35. CV Connect IF OmpUT to IF INPUT of IF

RECEIVER. G) Monitor marker image on the IF RECEIVER,

and adjust Z5R32 so that the sweep width registers 35 MHz.

4.3.4 FM DEVIATION CD Set BB FREQ of the BB Generator at

200 kHz. CV Set FM DEVIATION at "340" (kHz rms) and

SWEEP WIDTH MHz at "0". G) Connect IF OUTPUT to IF INPUT of IF

RECEIVER. @ With SPECTRUM function of the IF

RECENER, adjust Z6-R29 so that carrier component becomes zero.

4-5

--

11' 1'-L.'-'L..l l' CoI'

4.4 IF RECEIVER receiver shown in Fig. 4.4-1 will appear. The following calibrations can be made by

Remove the top plate of the receiver. Then, IF regulating the variable resistors shown in Fig. 4.4-1.

Z8-R43 BB Level Adj.

"

.--, ~ ~3814~MHZ......i Z6-R42 70 MHz Spectrum Center

Z6-R36 140 MHz Spectrum Width

Z6-R35 70 MHz Spectrum Width

Z-R42 Meter Zero Adj.

Z5R24 IF Freq Adj.

Z5-R25 AFC GAIN

Z5-R48 AFC Loop Cut Freq Adj.

56450 (b)

Fib' 4.4-1 Calibration of If RECEIVER

~4-6

4.4.1 IF INPUT LEVEL Meter For the meter calibration, feed power with a

definite value at 70 MHz or 140 MHz to IF INPUT, and performed by means of "Level Meter Zero Set" control Z4-R38 and "Level Meter Sens" control Z4-R46. Those controls can be seen when the front cover of the receiver is removed.

4.4.2 CENTER FREQUENCY MARKER As illustrated in Fig.4.4-2 as IF sweep signal and

crystal output are compound and fed to IF INPUT, a DG image as shown in Fig. 4.4-3 emerges. Adjust the "AFC Center" control Z5-R24 so that the center marker falls in between two beats of the DG image.

-,. .

.J .

56003 Fig. 4.4-2 Calibration of the Center Marker Connection View

It< Kr.L,/:,1 v r.K

Fig. 4.4-3 Center Marker

Requirements: BB FREQ: 100 kHz: Type A

93 kHz: Type B 83 kHz: Type C

FM Deviation: Approx. 50 kHz rms

4.4.3 SPECTRUM CENTER With the CRYSTAL OUTPUT connected to IF

INPUT, adjust by "Spectrum Center Adj" of Z6-(R38 or R42) so that the spectrum marker comes to the center of the CRT.

4.4.4 AMPL CAL No calibration is required provided that the

components of AMPL CAL circuit of Z2 (refer to 5.5.4) are satisfactory or @ input level (Fig. 5.5-8) is normal.

----.

4-7

4.5 BB RECEIVER Calibrations can be made by means of variable resistors. Theoretically there is no need to make delay

Remove the IF receiver shown in Fig. 3.5-1 (c). calibration nor linearity calibration. In case a trouble Then BB receiver shown in Fig. 4.5-1 will appear. occurs, replace the faulty parts.

DD 1'.J.:.....I:.ll'LJ'

t 'OC~="~"J ~. --------.

Z3R31 Meter Zero Adj.

ZJR37 Meter Sense Adj.

56447 (b)

Fig_ 4.5-1 Calibration of BD RECEIVER

4-8

---

4.5.1 BB INPUT LEVEL Meter Method of calibration:

CD BB INPUT: Input the BB signal of odBm level.

(1) BB INPUT LEVEL dBm: Set at 0 dBm.

(J) BB FREQ: EXT @ Meter-zero

setting: Set at zero. (Set by Z3-R31.)

G) BB INPUT: Input the BB signal of +1 dBm level.

Meter-sensitivity: Set at +1 dB. (Set by

Z3R37.)

Table 4.5-1 Specification of BB Input Signal

RemarksSpccifiClllions

50 k to ) 2.39 MHz Input frequency -51 to +6 dBmLnput level

At input of 0 dDm O.3 dB Accuracy of input level

4.5.2 DELAY (DP) CAL A calibration circuit is shown in Fig. 4.52 taking

CAL: IOns as an example. The BB signal is divided into two in the circuit, sending one directly to the changeover circuit and the other to another changeover circuit with 10 ns delayed through a CR circuit.

The two changeover circuits are turned on and off alternately with CAL signal. Reference IOns is displayed on the CRT.

The delay time can be expressed by the following equation:

r = (tan-I tV CR)/w =; CR

In this circuit, since delay time is determined by the values of C and R, calibration can be performed -by measuring CR value as one of the methods for calibrating CAL value.

~ Changeover",,circuit

BB Signal 0--

14.11

"1 5!l 022

OPFc{ r lSL CAL Signal

Fig. 4.5-2 CAL Circuit

4.5.3 LINEARITY (DG) CAL A calibration circuit is shown in Fig.4.5-3 taking

CAL: 10% as an example. The level of DG signal changes at point @ by

switching the switchover circuit (Q6) with CAL signal, and the difference of change is displayed on the CRT as DG CAL. The value of DG CAL may be expressed as follows:

RIG = . x 100(%)

In this circuit, since DG CAL value is determined by the values of RI and R2, calibration can be performed by measuring the values of RI and R2 as one of the methods of calibrating CAL value.

High impedance DG Signal ~

r--

Ra 0711.1 k.l1 Rb

100 k.l1

..n.r

..nn Fig. 4.5-3 Linearity (DG) CAL Circuit

4-9

----

~

4.6 CRT DlSPLA Y

(a) CRT DISPLAY View 56422

CRT-fO)

CRT':'R5J

(b) Right Hand Side View

Fig. 4.6-1 Calibration of CRT DISPLAY

56428

4.6.1 Trace Rotation Trace rotation setting should be made as follows.

CD mSPLAY YI OFF (1) DlSPLAY Y2 OFF

~.Q) CALIBRATION OFF @ HOR GAIN Adjust the length of base

line to the full scale.

t @Yl Adjust the base line YI ---.

to the upper limit of the scale.

@Y2 Adjust the base line Y2 to the lower limit of thet scale

(j) TRACE ROTATI 0 ROTATION Adjust the two base lines

so as to coincide (CRT R73) with the scale.

4.6.2 Vertical Gain Sensitivity Set the vertical gain sensitivity in conformity with

the following procedures.CD RETURN LOSS INPUT (Rear Panel)

EXT (Xl) (1) DlSPLAY YI RET LOSS G) DlSPLAY Y2 OFF @ CALIBRAnON OFF Q) Yl Adjust the base line YI

t to the center (fifth graduation) of the scale. Apply signal of 1 kHz and I Vp-p to RET

LOSS EXT IN on the rear panel. @) VERT GAIN

FINE ADJ Adjust the I kHz signal (CRT-RSl) am plitude so as to

coincide with the full scale (10 gradua tions)

~

---.

-,

4-10

SECTION 5

REPAIR

5.1 INTRODUCTION the defective unit is known beforehand, repair it immediately referring to instructions of its trouble

This section will explain circuit operations and hooting. troubleshooting. If a trouble occurs, find out the Before repairing, check the power source as menfaulty unit and repair it referring to Table 5.1. When tioned in item 5.2.2. I) No Power-on.

Table 5.1-1 List of Troubleshooting

Troubleshooting Items

No Power-on 5.2.2 (I) No Amplitude measurement 5.2.2 (2)

I

No Linearity (DG) Measurement 5.2.2 (3) No Delay (DP) Measurement 5.2.2 (4) No IF Return Loss Measurement 5.2.2 (5) No Spectrum Measurement 5.2.2 (6) No Marker 5.2.2 (7) Provide another microwave system analyzer

CD Troubleshooting for transmitter 5.2.2 (8) @ Troubleshooting for receiver 5.2.2 (8)

5~ 1

- --

---

5.2 EQUIPMENT

5.2.1 General

BB Signal IF SWEEP

BB GENERATOR GENERATOR Sweep Signal

,.

,I

I

TRANSMITTER ~. I IF OUTPUT

AUX IF OUTPUT

CRYSTAL OUTPUT

BB OUTPUT

BB + SWEEP OUTPUT

SWE EP OUTPUT

I --.

RECEIVER I

IF INPUT

IF RECEIVER

.--- RETURN LOSS INPUT

~

CRT DISPLAY BB INPUTBB RECEIVER I

.----.,

rig. 5.2-1 Block Diagram of Equipment

Microwave system analyzer is composed of IF RECEIVER has the functions of demodulating the transmitter section and receiver section consisting of received IF signal and sending it out to the BB the following units: Receiver, shaping marker, detecting amplitude

characteristics, and detecting return loss for sending it BB GENERATOR is a unit for generating highly stable to the CRT Display unit. BB signal and sweep signal.

BB RECEIVER is measuring linearity (DG) and delay IF SWEEP GENERATOR has a function of generating (DP) of the FM circuit on the basis of BB input signal. the IF signal which is FM modulated and frequency ----swept by the BB signal and the sweep signal from the CRT DISPLAY is for selecting signals which are BB GENERATOR. The 70/140 MHz quartz crystal detected by the IF Receiver and the BB Receiver and oscillators are also built into the unit. displaying such signals on the CRT.

----.5-2

--,

12

J4

RECEIVER

Fig. 5.2-4 ) Receiver Rear

( Panel Connection

TRANSMITTER Fig. 5.2-3 ) Transmitter Rear

( Panel Connection

IF Sweep Genera tor 55 Generator

rig. 5.2-2 Rear Panel Connection

5-3/(5-4 blank)

56427

-- -- -

/ T

J2 I ( :J20):J f_ //' ~ 3 tolAC :r:fv I t~ ..... IF SWEEP (jE NEKIi TOR2 - ::*

J4- I (JI) C ~ (SWEEP IN) r"'\ J5 ( J2 ) ~ ~ (B BIN)

I

IJ6 I (J2)

o -~ (SWEEPOur) .[7 ( J3)o . (B B our)

I

BB f1ENER!f TOR:T3 I ( :Tn

~.~H= :1 "

-, I

I

C.L.: Table 6.8

SECTION 5 REPAIR EQUIPMENT-General

TRANSMITIER REAR PANEL CONNECTION

Fig. 5.2-3

r-..... IIF OUTPUT I(JFn~ r--

----( IAux IF &TPud ( .J27>~ r-.....

'- Ic~rJ TAL OUTPUT I ( J2'?F

I - i

-I

! I

r"'\ IBB OUTPUT I4L ( :;[15 ) ,

I r-..... , leB-tSWEEP OUTPUTI'.;Z

( ;[14)

\. ISWEEP (VTP(IT I ~ " ( ;[13 ) ,

5-5f(5~6 blank)

I SECTION 5 REPAIR EQUIPMENT-General

I I RECEIVER REAR PANEL CONNECTION

I Fig. 5.2-4 .... ~! !;:l'~ ~ ~ ~ II ~~~~ ~ ~ 11" I-...~ I-...Df'T OIS?I./J( ~~9..>--~~ ~~ ~ ~ .~ % "S;~~~"cs~~;;s .~~ ~ ~ ~ :::,..::.. ~~l!J

I O;>EtfIlTION SECTION ~~~~~2 ~~ ~ i" ~ ~ ~~~~ elfT SECTION L.'/~ ~ : ~ ~ ~ ~'/~ ~ --- ~ >< u,L-. ------. ~ ~ ~ "~I (:FI) '- I'" '" '

SE

SECfION 5 REPAIR EQUIPMENT - Troubleshooting I

I 5.2.2 (Cont)

I(2) No Amplitude Measurement However, if the measurement is impossible because When the amplitude characteristic measurement IF signal sweep is impossible, refer to Section 5.4 IF

is impossible, find out the defective unit according SWEEP GENERATOR. to the troubleshooting procedures shown below. I

No

Refer to Section 5.4 IF SWEEP GENERATOR.

Yes

No

Normal

Refer to Section 5.7 CRT DISPLAY.

Check connection between IF RECEIVER and CRT DISPLAY.

Fig. 5.2-2 J3J4

No

Yes

Normal

Refer to Section 5.5 IF RECEIVER

No Amplitude

Yes

Check connection between IF RECEIVER and CRT DISPLAY.

Fig. 5.2-2 J3-J4

I I I I I I I I I I I I

Fig. 5.2-6 Troubleshooting Flow Chart 2 I I I

5-10 I

I SECTION 5 REPAIR EQUIPMENT-Troubleshooting I I (3) No Linearity (DG) Measurement

5.2.2 (Cont)

troubleshooting procedures. However, the amplitude If the linearity measurement is impossible, find measurement is also impossible, refer to Amplitude

I out the defective unit through the following Troubleshooting. I I I I I I I I I I I I

Refer to Section 5.6 BB RECEIVER.

Check connection between BB RECEIVER and CRT DISPLAY.

Fig. 5.22 J3-J7

Refer to Saction 5.3 BB GENERATOR.

No

BB GENERATOR meter does not operete.

No

Normal

Refer to Section 5.4 IF SWEEP GENERATOR.

Check connection between IF SWEEP GENERATOR and BB GENERATOR

Fig. 5.22 J5J7

No

Normal

BB RECEIVER meter does not operate.

No Linearity lOG)

Yes

IslFtolF performance normal?

Refer to Saction 5.5 IF RECEIVER.

Check connectio~ between IF RECEIVER and BB RECEIVER.

Fig. 5.22 J5J6

Fig. 5.2-7

I I I I

Troubleshooting Flow Chart 3

5-11

SECTION 5 REPAIR IEQUIPMENT-Troubleshooting I

5.2.2 (Cont) I(4) No Delay (DP) Measurement troubleshooting procedures. However, the linearity If the delay (DG) measurement is impossible, (DG) measurement is also impossible, refer to

fmd out the defective unit through the following Linearity (DG) Troubleshooting. I No Delay (DP)

Adjust BB FREQ of BB GENERATOR. Refer to Section 4.2.1.

Check connection between BB RECEIVER and CRT DISPLAY.

Fig. 5.22 J3-J7

No

Normal

Refer to Section 5.6 BB RECEIVER.

I I I I I I I I I I I. I I

Fig. 5.2-8 Troubleshooting Flow Chart 4 I I

5-12

SECTION 5 REPAIR EQUIPMENT- Troubleshooting

5.2.2 (Cont)

(5) No IF Return Loss Measurement troubleshooting procedures. However, if the If IF Return Loss Measurement is impossible, amplitude measurement is also impossible, refer to

find out the defective unit through the following Amplitude Troubleshooting.

No IF Return Loss

Yes

Check connection between IF RECEIVER and CRT DISPLAY.

Fig. 5.2-2 J3-J4

Normal

Yes Replace IF RETU RN LOSS BRIDGE.

Refer to Section 5.4 IF SWEEP GENERATOR.

*1 Connect the IF OUTPUT of IF Sweep Generator

Refer to Section 5.5 to the IF INPUT of IF Receiver. I F RECEIVER.

Fig. 5.2-9 Troubleshooting Flow Chart 5

5.2.2 (Cont)

(6) No Spectrum Measurement troubleshooting procedures. If the Amplitude If the spectrum performance does not function, measurement is also impossible, use the Amplitude

find out the defective unit through the following Troubleshooting.

No Spectrum

Is spectrum measurement Noimpossible even when using Check frequency and level

CRYSTAL OUTPUT of of signal to be measured. IF SWEEP GENERATOR?

Yes

Check connection between IF RECEIVER and CRT DISPLAY.

Fig. 5.2-2 J3-J4

I

Refer to Section 5.6 IF RECEIVER.

Fig. 5.2-10 Troubleshooting Flow Chart 6

5-14

5.2.2 (Cont)

(7) No Marker find out the defective unit through the following When Marker performance does not function, troubleshooting procedures.

No Marker

Abnormal

Normal

Check connection between IF RECEIVER and CRT DISPLAY.

Fig. 5.2-2 J3-J4

Refer to Section 5.4 Refer to Section 5.6 IF SWEEP GENERATOR.IF RECEIVER.

Fig. 5.2-11 Troubleshooting Flow Chart 7

5-15

5.2.2 (Cont)

(8) Provide another Microwave System Analyzer and replace those units which seem defective. Such replacement may be performed either mechanically,

or through electric replacement is recomof the defective unit.

connections, mended for r

but eliable detection

mechanical

-Electric Connection Method-

MSA 1 (Trouble) MSA 2 (Normal)

CD Troubleshooting for Transmitter the defective unit through the following Connect as shown in Fig. 5.2-12 , fmd out troubleshooting.

56003

Fig. 5.2-12 Connection of the Troubleshooting

Refer to 5.3 BB GENERATOR.

Normal Troubleshoot receiver.

Check connection between BB GENERATOR and IF SWEEP

Normal GENERATOR. Fig. 5.2-2

J4-J6 J5-J7

Normal

Refer to Section 5.4 IF SWEEP. GENERATOR.

Fig. 5.2-13 Troubleshooting Flow Chart 8

5-16

56003

5.2.2 (Cont)

W Troubleshooting for Receiver out the defective unit through the following Connect as shown in Figure 5.2-12 , find troubleshooting.

Normal

Check connection between IF RECEIVER and BB RECEIVER.

Fig. 5.2-2 J5J6

Normal

Refer to Section 5.5 IF RECEIVER.

Refer to Section 5.6 BB RECEIVER.

Abnormal

Check connection between BB RECEIVER and CRT DISPLA Y.

Fig. 5.2-2 J3-J7

Normal

Abnormal

Normal

Refer to Section 5.7 CRT DISPLAY.

Fig. 5.2-14 Troubleshooting Flow Chart 9

5-17

5.2.3 Other Troubles

(l) Beat in the measured waveform CD Check the spring for ground since such a beat

in the measured waveform is due to improper ground of circuit boards 5.5.4 (Z2), 5.5.5 (Z3) and 5.5.6 (Z6) of IF RECEIVER.

Q) Such a beat can take place if there is deviation of the intermediate frequency 16.35 MHz. If so, then make necessary adjustment by AFC CENTER control knob (R24) in accordance with the steps shown in Section 5.5.7 (Z5) of IF RECEIVER.

(2) AM/PM conversion does not decline below O.3/dB

CD Adjust by PIN BIAS on the IF SWEEP GENERATOR. In the event that the extent of

AM/PM conversion value should go off the specification as the above-mentioned adjustment is conducted, the problem is due to the IF Receiver. Necessary adjustment can in this case be made by means of Limiter bias control (RI7) of 5.5.9 (Z7) but this step must be performed with utmost caution.

Q) To adjust AM/PM conversion of the IF Receiver to the optimum condition, use a parabolic delay network of narrow band, and adjust by the limiter bias control (RI7) of 5.5.9 (Z7) while watching the symmetry of the DG image. For a modulation frequency use 556 kHz or lower. For further details, refer to the OPERATING INSTRUCTION MANUAL []] STANDARD GROUP DELAY NETWORK METHOD.

5-18

61-5

-----------------3.LON ----------------

5.3 BB GENERATOR

5.3.1 General BB Generator is a unit for generating highly stable

BB signal and sweep signal. Block diagram is shown in Fig. 5.

BB Generator consists of the following blocks.

ZI Power Supply is the circuit for supplying DC voltages.

Z2 BB OSC and Divider is the circuits for generating BB signal and dividing.

Z3 Sweep CCT is the circuit for generating 18 Hz and Line Sweep signals.

Z4 BB Filter is the circuit for setting levels of BB

signal and for eliminating harmonic of BB signal.

Z5 AGC Amp consists of an AGC amplifier for rendering the level of BB signal and a meter circuit for indicating BB output level.

Z6 Output Amp consists of a buffer amplifier of BB signal and a circuit for composing BB signal and Sweep signal.

Z7 Mother board is the circuit for connecting between the printed circuit boards.

Z8'"" ZII BB OSC and Filter is the circuits for generating higher BB signal (optional) and for eliminating harmonic of BB signal.

5-20

I I I I I I Line

I to I F-G { (SWEEP OUTPUT) (SS OUTPUT)

I I EXT SWEEP INPUT I

I IEXT SS INPUT ISWEEP OUTPUT! I SS OUTPUT I

I

I Z2 I

Iss LEVEL ADJI ISS OUTPUT LEVEL I

(OPTION) [SSFREoHZ] E EXT ~J(d)f---

I. I

I SS OUTPUT I

~S OUTPUT LEVEL dSI3

I fl f2 f3

I f4

f5

f6

f7

SECTION 5 REPAIR BB GENERATOR-General

BLOCK DIAGRAM OF BB GENERATOR

Fig. 5.3-1

ISWEEP OUTPUT I

f2

f4

f6 f7

f5

f3

fl A type

2 MHz 200 kHz 100 kHz

S type 92.593 kHz 277.778 kHz 555.556 kHz

C type

250 kHz 500 kHz

83.333 kHz

NOTE -; OPTIONAL FREO.

I I I 5-21

SECTION 5 REPAIR BB GENERATOR-General

I' I I I\JIlL ~

N~ I

Front View I I I

56445

(a) With Cover Installed

I :.-t-t...i.. ,

TI IRear View ZI

Z5-R38 Meter Zero Adj.

Z3-R33 Meter Sense Adj.

Z3-R8 18 Hz Sweep Lc.wl Adj.

Z3-R4 18 Hz S_p Frcq. Adj.

56433

56437

......--o"no~ ---... 18 Z~ Zlp Ztt S3

Z2 ! I,

Z3

Z4

Z5

Z6

56444

(b) With Cover Removed Bottom View

Fig. 5.3-2 Top Views of BB Generator Fig. 5.3-3 Front, Rear and Bottom Views of BB Generator

56443

5-22 I

I SECTION 5 REPAIR I I I I I

NoTE ,.

,AC'" ~ ... ,:eINEeT/ONI 1- rz fi,-(@-(l,) I/O V '1 - l, IZl-(~-~) /IS or '[ - 1; I-(I!-Il) /10 LI

I 1- iJ I@-~-@J L- 1J I ~- cr>

21lJ'tI ~-"I:i>-~ Z30V ~- '" I-il> z'i-/iV ~- 151 ~ - ~

I 71

(Ae * ~ V) 1=I

I

I I I I I I

._- ----_. ~------------- If' [mIl >/5 I ~ I 1!iU~~ >---B- -----------JI6

ISWUPOV1PUT I r-=.-e j-I /JB iJvrPl/T I ~7-0_ (JWEEP ourPl/r) ~-

n ( 6/1 011 "VT) >---Q--------

1[;''N qp 1m

(9 III .)lle

~

4 d=t

ll~ j, g '>

OIVIVER ? I !'ILT!(.. FILTER j . ~ " ~ ill ! _J L ~ L J L____ L Ed L_ 1m (Y4~__ L'2e'J ~

n

,Il QI ~'~ ~j" "t tz.slU(J3

+ I' 6B OIlTPlJllil'LdB_ll_.ff ""

r;;:iJ NI(H NOTE FIL TER 5 WITH :l: ; OPTION _."~~,.. @o"..

:!1 Q ..;..O~ Q" ' C; I)" .. ~ l>~ "I

C.L.: Table 6.3-1

l -lIZI PO~RsiJPL_:::-l Iz~ ~8 05CA~;l llio ~8 OJc~DI ~-sIPEEPcc;------l ~--BB l r :-~ I ~ 3. s ,

7

-! ---1-

" n

~~ !1-

---' !!-!:L ~ !L -'!. II

"

_

FILTER Lt~_=..;~li=~) _l~N'N"~ J ~ ;n;~I_ ~;n=~ j j ~ IJ4) (I&) (Jlf) all)I r--l

7:7 HoTHER BOARIJ

! '~I'~\ '~I'~~l~~l 'i'~~~J~l 'i"~OO'~'N,r'lll

BB GENERATOR-General

BB GENERATOR

Fig. 5.3-4

rss-f:RHI H~l

IA TrIO (, TYPE>

188 OIlTPIJT LEVEL-A';:" I

------g

IJIt'UPural

------ 0 ISifffPF.REQ]hl ~C2!J@]

- -- - a::o::=:::J

S3-b

EQj'EEP tlLlTPUT I I ~4VTPur I 188 oUTPiJ"O

5-23/(5-24 blank)

I SECTION 5 REPAIR BB GENERATOR-.Troubleshooting

I I 5.3.2 Troubleshooting of BB GENERATOR

I Locate points in trouble in the following manner and check the circuit of each block. (1) I No BB Output Signal I

I I

case 1 I

case 2

II

case 3

II I

I case 4

I

BB OUTPUT of rear panel is normal. (about 0 dBml. I> Check the circuit of 5.3.7 (Z5) and 5.3.8 (Z6).

Normal when BB FREQ is 556 kHz or lower.

I> Check the circuit of 5.3.10 (Z8 to Zl1).

Normal when BB FREQ is 2.4 MHz or higher. (optional) I> Check the circuit of 5.3.4 (Z2) and 5.3.6 (Z4).

Normal when a BB signal (0 dBm) is applied from EXT BB INPUT of rear panel with EXT set of BB F REQ.

I> Check the circuit of 5.3.4 (Z2) and 5.3.10 (Z8l.

(2) I No Sweep Output Signal

Normal when a sweep signal (1 Vp-p) is applied from EXTSWEEP INPUT of rear panel W'ithEXT set of SWEEP FREQ.

I case 1 I Normal when SWEEP FREQ is 50 (60) Hz.I

I> Check the 18 Hz circuit of 5.3.5 (Z3).

I case 2 Normal when SWEEP FREQ is 18 Hz.I I> Check the 50 (60) Hz circuit of 5.3.5 (Z3).

I case 3

I> Chcek BPF circuit of 5.3.5 (Z3l.

(3) I No,BB + Sweep Output Signal 1I

case 1 r Check BB and Sweep Output Signals of items (n and (2). 1I I case 2 r

- BB signal of BB + SWEEP signal is defective. 1 I I> Check Q2 of 5.3.8 (Z6).

case 3 Sweep signal of BB + SWEEP signal is defective. 1

I I> Check Q1 of 5.3.8 (Z6). I I 5-25

SECTION 5 REPAIR IBB GENERATOR-ZI I

5.3.3 Zl POWER SUPPLY indicated in the Table below. In addition, a part of AC line signals is sent from J2-2 to Z3 SWEEP I(1 ) Circuit Description CCT.

This is the circuit for supplying DC voltages of 24 V, 12 V and +5 V. The voltages are set as (2) Circuit Check

Points for Measurement

Voltage (V)

Voltage Tolerance (V) Ripple (mV) Setting

12-5 -12 V 0.3 V 5 mV or less Voltage adjustment: R8

JZ-6 -24 V 0.5 V 5 mV or less 12-7 +5 V to.15 V 5 mV or less

Voltage adjustment: R2l12-8 +12 V to.3 V 5 mV or less 12-9 +24 V to.5 V 5 mV or less

R21 R8 TPI TP3 TP2 Z1 POWER SlFPLY 88-T 432U19~5 (8)

D D ,~m, ~ L ~I r rr -1 ~ r r '" r Q Q - It>_. II: 11:_11:-... CI r '" Cl II: Q21,.... I r-R1S'L a: LU ++r &!N....II: II:l ~ + L I C 2 n\ r-RI7, l l r- -C6 rQ29 ~

II r [r"I, CS(""';' J r ,C12 .... + IQ23~ CI0r-\ ,....R23, .... U 5 I, 5 I, rr 5 I, l lit Q5 I, rr SQ9 I, 1 u [~~ l n }n~~rI~r5 n ~lUPt~~~~~~ p ~~~1l u+l + j'o, 'LLhnf. Jj .()cllUH L'D~ j HJ'03' '0' 1

rQ17~ QI, B Q8 J2 10 L R 1 ..J .--' J 1 2~ '--Q27W

Fig. 5.3-5 Zl POWER SUPPLY Component Location

5-26

I I I I I

I I I I I I I I I I

----------- -

I SECTION 5 REPAIR BB GENERATOR-Zl I

Zl POWER SUPPLY

I Fig. 5.3-6 I Rn 3.31

I

SECTION 5 REPAIR BB GENERATOR-Z2

5.3.4 Z2 BB OSC AND DIVIDER C - 500 kHz) quartz crystal oscillator Xl, and sending it out from JI-7, 8 and 9.

(1) Circuit Description This is the circuit for generating BB signal, (2) Circuit Check

dividing output signal from the highly stable (Type Oscillation frequencies and levels are set as A - 2 MHz, Type B - 555,556 kHz, Type follows:

Name of MSA Series

BB Frequency (kHz)

Points for Measwement

Tolerance of Frequency

(Hz) Level Setting

Type A 100 Jl7 TO.5 n- r 2 Vp-p or more _.1.

The frequency is adjusted by trimmer for fine adjustment of crystal oscillator Xl. Refer to Fig. 5.3-7.

200 Jl8 1.0

2 MHz Jl9 10

Type B 92.593 JI7 TO.46 J1-r2 Vpp or more

--'

Same as above.

277.778 JIS 1.4

555.556 JI9 2.8 Type C 83.333 JI7 0.41 J1-r2 Vp-p

or more_L

Same as above.

250 JI8 1.25

500 Jl-9 2.5

Z2 BBOSCANDDIVIDER BBi4T Q4 e 14 03 8 I I) I) I

1 71 7o '--R2-' 14'--R4-'S '--R 1---1r NE-.. C .:.) _ I

+ L (J ~ 02 7 '- R13 ....I '--RS-' '--R9-' '-06 -++--'

'--R7---1 '--Q7 *'"

E '-R5- ---1 '--R6 -J '--R3-' '--Rll --'

I II '-- C 1-----' '--RI2-J XI I J I 10

442U55876 (B)

I I I I I I I I

Type A I 7 04 I 7 03Z2 BB OSC AND DIVIDER

,

I I + L ~ BOI 02 7

'--R13 --' '--R8 --' '-- R9--' '- R7--'

E '--06 ...., '- R5 --'

'-- 07"'" '-- R6--'

'-- R3 --' '-- Rll--' '-- Cl --' '-- R12--'

X I 1+ JI 10 442U52019 (B) I I

Type Band C

I I I I I

Fig. 5.3-7 Z2 BB OSC AND DIVIDER Component Location

5-28

I

I

SECTION 5 REPAIR BB GENERATOR-Z2

Z2 BB OSC AND DIVIDER (A TYPE)

Fig. 5.3-8

1- C' 71 I;"4.7

FRESUENCY _____ Q4- 1./1./3.14. (;U - 5 lMHl X'TAL 05C +/2V-I~----t rRO!1 TZ- 8i/

-t-5V r- DII/IDEK \ / \ [ BB rf(E6( HB IQ2

+5V ~ rf(OM {/-:rZ-7+/ZV ftp820lDR2 47tJ

13, :\j,z az

/1

&./ Q3I ~3 r-TR425C943

. - - 330 PPB21?D 9

To zl1,-J1-2 TO lJI-3

0

7

5

6

8

4

T() - -I1-410

0

o 0J l6 ' -~

4 Q2!p; ~

a, lQ7~ 330

/5'153 IS '1.53

R5 /16 6al) ~Ji/) I

..t R8 fR9 330 &a0

J m Q4.

ftPB213D

Ill! 680

442U';S876 _J

c.L.: Table 6.3-3 (A TYPE)

5-29/(5-30 blank)

--

SECfION 5 REPAIR BB GENERATOR--Z2

Z2 BB OSC AND DIVIDER (B/C TYPE)

I

I Fig. 5.3-9 I

I , - f- CI I

- 4 7 J/ I

"c- 4 Q3- /4 T.... . ,.........; IFI?E().UENcr ()( /, / 1 \ 04 -(4 -+/2V 2 / TKOt1 4,/- JZ-8~ DIVIDER

-t"5V,- SJ"6 j(H~ X/TAL 05C \

+/2V R2 470

-L QID... 25[923

XI

Q6 /5963 R7

/D

L R/l

33() ~S ~ao /?8 ~R9

.JJO ~ 68() 4

,--- .. ,~ (

SECTION 5 REPAIR BB GENERATOR-Z3 I

I 5.3.5 Z3 SWEEP CCT

(1) Circuit Description

(2) Circuit Check Levels and frequencies at various points are set as

follows: I This is the circuit for generating 18 Hz and LINE

SWEEP signals.

Points for Measurement

11-5

Frequency

18 Hz

Tolerance of Frequency

0.18 Hz

LINE -

11-9 18 Hz or

LINE -

Check the circuit by referring to Fig. 5.3-11 in case setting cannot be made at the various points

R" R8 R12 Z3 SWEEP ff~ DDqH~t H 1tlH lDQ~ Lll Lca...J L.C7..J rlLls~)D JJ JUJu JJJ

TPI L. R29---1 '---R23---1 Q2 G ( 1 8-f 1 a r 1 8 r r r r ( r r ( - H", H ~ N a: }.....( (i M tl ,,01 ~ l 4 Q 7 5 r ( ( (( r (~ - on ..... J, on 16 ~ '( a: a: ~ a:l i L ~ -l.. t L l 432U19507 (8)

Level

I Vp-p O.I V

I Vp-p O.I V

30 Vp-p or

more

Setting

SWEEP FREQ (switch on the front panel): set at 18 Hz

CD Setting of frequency: R4 (1) Setting of level: R8

SWEEP FREQ (switch on the front panel): set at LINE

Setting of level: RI2CD SWEEP OUTPUT, BB + SWEEP OUTPUT output open

CD Setting of level: R37

H

I SECTION 5 REPAIR BB GENERATOR-Z3

I I Z3 SWEEP CCT

I Fig. 5.3-11 I

r--- 611I I I JJPCl51A .,,v-iI ~rr--;+::::""'----/

J I 2

R8 11 @ 10K

I

Q c I5WEEPOIITf'IJTI

:;1H en 6' QI3

2sC/008

,('33 II"

Qil 2sA578

R31 ~ 8.2k'f 1(37 3

0 101' ;>

c l3 ISIlIEE.PilfEZJ

Y: i' %iV '\ ( Yj os ~v ) .,,, liA\( x; ZOm5%iV I 481

SECfION S REPAIR BB GENERATOR-Z4

5.3.6 Z4 BB FILTER as well as for eliminating higher harmonic.

(1) Circuit Description (2) Circuit Check This circuit is for setting level of the BB signal Levels at various points are set as follows:

which is obtained from Z2 BB asc AND DNIDER

Points for BB Frequency (kHz) Level (V) SettingMeasurement Type A Type B Type C

Jl-14 (G)

100 92.593 83.333 1.5 Vp-p :1:0.2 V

Level adjustment:

Level adjustment:

Level adjustment:

R1

R17

R23

200 277.778 250 1.5 Vp-p rO.2 V

2 MHz 555.556 500 1.5 Vp-p :1:0.2 V

Check the circuit by referring to Fig. 5.3-13 in possible. case setting specified in the above table is not

R23. ~ + ;;j l:j ( !3 ~ r ~O Z4 BB FILTER BB-T 20~J&~ ~ ~ ! ([" 'C [" )[ [~ l r ( ,-R7-, ,-R24-"'. III l l ~N M ~ :c ~ l l ~ cI> +,-C13.,

'OR174~4;rrr rr ~ ~ Qt1r, '( r rr llQ6~ :~:~ 2 3B'-C ~~~ ~ N \.~ C7I ;:: &!~ ((""\ l ,-R6--, ~18-, ttl l t .. L3 LLle~ E+QQ2II> L4 '( (

R1 + + + U l ( (E ellU 0:3 0

1 4 Ql E 1 1+ l(([ ~ ~ B;:: C7I

') ., .... r-R14~ ll< a: a: 20B'- C 9 y~ JU ;; Ll L2 ,-R15..., l tEne J j

,-R2-, J J TPI Q~ 1 J1 22

432U19509 (B>,--- ~ \.-.e15~ '-R12---.J

I I I I I I I I I I I I

Fig. 5.3-12 Z4 BB FILTER Component Location I I I I I I I

5-34 I

II

r-- L.OW ,PASS FlL TEF!,LEVEL SEr~ \

I LP. F QI fc cc T No. A.nPE BANOC J TYPE! Ann eMHl

BANoe TrpE

(S6KHl!

(4 IOOOpF fiJiJO,F [5 47 0pF Z2Q,.F (6 NODpF 2000l'F C7 - -C'I fOOOpF 1000,.F e,l

-

LI 470pF

--_-.:4"TIS,IO

E

220l'F --'----

4"'THIJ7 F

Ll !f31TIS'S"IO f /d1Tlf1J7

F

ATrPE lO0mi

9AI/DC TrPE 17!tHI

Cf'l NOOH uoopF

rei fOoopf 3JofF (N 4'fOOpF nood (l3 10iJOpf" 2000 ,F Cls ?lOOfF 2Z(I[;rF ('Z6 I OlJOpF JJopF

L3 '~---

L4 _ C

ro '771fl31 jE

4JfT14137

C ~1TI4m

E I4J'Tffl31

A. T!7'E /!JOml

BANDC

93KHz

(31 4700pf 4700,F C3l Noo,f" 2200l'F

CD aolj).F o.ol)lF 04 (36

r------1000P~_ 4'10(11'(

10oo,F

4700 l'F

(3'1 1---

LS

Z2t10pF 2200,.F

D _ 7J1Tf4-137

0

D

4J1T/407

L6 !43'1'T/41J? 4"if'fi;rm 0

25,4578 CZ Ib' IlS

(). ' LI L2 ~l~'

-2. c< Iu t "1 "f'lIU :3 _2 II< I @~

-121/ ATrPEc : Jc ~ 2Mflr )(

:8, c un: fc = $,5 6 kill

I 0&

04 I 2SA5'13 '-u=--t:

.N? cr.1 R?I IK + _ 330 /.3~/8 ~ L4- ;??? ~ ra---

"-- BUTTEl? A1'1P ------./ 18 /9 t:: ---12V 20 n -:rZ-S

-t-12V 21 ---Z/-:T2-8 2Z

432U/930t;

C.L.: Table 6.3-6 (A TYPE) Table 6.3-7 (B/C TYPE)

5-35

SECTION 5 REPAIR BB GENERATOR-Z5

5.3.7 Z5 AGC AMP

(1) Circuit Description This circuit consists of an

rendering the level of BB signal AGe loop for constant and a

meter circuit for indicating BB output level.

(2) Circuit Check Output level of this circuit is set as follows:

Point for Measurement

Level Range of Level Adjustment Remarks

J2 +10 dBm +1 dB to -1 dB BB LEVEL ADJ: From min. to max.

Setting of the BB OUTPUT LEVEL meter: Check the circuit by referring to Fig. 5.3-15 in a) Meter - zero setting R33 case the above specified setting is not possible. b) Meter - sensitivity setting R38

'" @ r-R9"""""'\ ZS AGe AMP BB-T ~R26", ID I' ) J2 (!.l...

,-R27 """""'\ R33rID, r r r ID @ r r 9 r r r I R38DU) It) It) t l>~ ftttuo",f t~ t ~ ~ ~ ~ '1 1'1 l '1 ) '1 1 1 1 '1 '1 '1 '1 '1 '1 I0' I S l @ ~ U ~ U ':! ~ ~ ~ III ~ ~ ~ :e ~ :;; g: ~ M~ ~ !~ 0 0 [ 3 ID '" r ; J ; J ;;;J j J JJ; Jj; rTPI lHJ~llll"'Ou la:l~ r r r r r~~ ~ .! ! r ( Or@r 8 "rQ"'~~~~~i~1 ~~lll~ll~1D :f Llll~-JOl~~l ~ f ~ ~; ~ a::~oa::ua::a::a::a::ua::J(\l \I 6 L~a::~~a:: l0J J J J ) J J J I J' 22 ~ @ l lU

010 @ @ r--- ~ 432U17S72 (B)

Fig. 5.3-14 Z5 AGC AMP Component Location

I I

5-36

JBB LEVELAD.TI

E4-:T/-8

188 OIiTPIiT Lfl"fl!

,-,.

f. 2'" 1

_____

SEcnON S REPAIR IBB GENERATOR-Z6 I

5.3.8 Z6 OUTPUT AMP OUTPUT signal, and the other is composed with the sweep signal, sending out from 13 as the I(1) Circuit Description BB + SWEEP signal.

This unit divides the BB signal into two and, following processing through the buffer amplifier, (2) Circuit Check then sends one of them out from J4 as the BB Check the circuit by referring to Fig. 5.3-17., I

Z6 OUTPUT AMP

D J2

432UI9511 (B)

+,-CII------..,----R14

C1Z + r "

+'-C .. --I~ "--RB----J '-R4-"

+'--CZ--' '--R7---1 E OIB ( '1 I CI4 + :3 L4 ...... L3r, l U U0 0 JI 22 ) ,)

BB-T r-RI3-----"'BqEQ~R9, D

~RII--". (~ '---R1Z---I D J4 J3l + '--CI3-"+

(+ rC4-...+ rCO, rC6, - ,-R6 0 ,reo" 0 r C6 --".

'-RO-" u~ oC LI LZ0 0

Fig. 5.3-16 Z6 OUTPUT AMP Component Location

5-38

I I I I I I I I I I I I I I I I

I SECTION 5 REPAIR BB GENERATOR-Z6 I

Z6 OUTPUT AMP

I I Fig. 5.3-17 I

0-5 11/d/V )( /0 mSffAiV Q/

2SC JJ'?O J I I Q ( IBB -t-SIIIEEPOIJTfUr! :14 I ~ 69 a I .._) 0 ~- Q ( IS80VT/Wl()c;Z tit 1 ~()()T

- l1I ~--'T -/27v L/ D~ Cl

I /5

~

I (BB SHjNAL) -24,V F,fOt"! i'3-JI-9F/?OI1 AT2-- e--j 0 I 02 2Sc890 I cl3 3.3-39V

...

I I L5 .;?4V FROM ZI-:rc-9 I 432U ItiS / I I I I I I c.L.: Table 6.3-9

I 5-39

Y; x;

-2./.V

SECIION 5 REPAIR BB GENERATOR-Z7

5.3.9 Z7 MOTHER BOARD the circuit boards.

(l) Circuit Description (2) Circuit Check This circuit is for making connections between

,-------, ,

10 J3

I I

~I I I-I',

,

~ ~ ,----, ,-----, 10 J'

I :;

L-~LI I ~I I 1 I ~, ~, ..

, '0;;1 I

L-

,I '"~U ,U ,U '" LJ

I 10

"

~I

,oIlZ7 MOTHER BOARD BB-T !'

432 U I 9 !513 IB) 10 "' ~

I I,

Fig. 5.3-18 Z7 MOTHER BOARD Component Location

5--40

I I I I I I I I I I I I I I I I I I I I

------

I SECTION 5 REPAIR BB GENERATOR-Z7

I Z7 MOTHER BOARDI

I Fig. 5.3-19 I

:J'tJlf'31 4 1.516

I J/5

I I I

SWEP OUT

I 88 tJvl I I

EXT 88

I "I >-f-L~----+-+------l

I [L !..

~ 1-6

~ !..,.

" !!.. L1 I.

~ L!. 1-

" ~10 11 11 JIB

~

sWlCPOVT(....1

1:J DI'#ATIOI/ J/fiIIAL $~ 1:5 7t :MI, OHKATIOIV 51GilAL ,,,,,,/I,OI'HATIOll 5kfilAL JOOki/' o!'HATM"! JlliNAL ELT 88 O/,RATlO"!

} LEVEL SFI

METER

T/Z'I/

""Y2M OI'KATloN EXrjWfP

.swE~P our

SWEEP IN

18'" O!,.RA77oN S!frNAL ,LINE Offl?A 11011 51qilAL

~",EEP ouT (~EAR{'AI/EL)

:71

C ,u(6')J1l

SECTION 5 REPAIR BB GENERATOR-Z8 I

I 5.3.10 Z8 TO Zll BB OSC AND FILTER

(l) Circuit Description This is an oscillating circuit of BB signal

(optional).

(2) Circuit Check Oscillating frequency and level are set as follows:

I I

Points for Measurement

Frequency (MHz)

Tolerance of Frequency (Hz)

Level (Vp-p) Setting

R6 2.4 2.4 about 0.73

Adjustment of frequency; Set by use of trimmer for fine adjustment of crystal oscillator XI.

Adjustment of level; Set by use of R I.

3.58 3.58 " 4.43 4.43 " 5.6 5.6 " 8.2. 8.2 " 12.39 l2.39 "

I I I

88 o.sc AND FILTER. OR Q1I ;- R2. ~8-T c C,0 8 r--.. E. ~ R:t----.o

C10"'/ C3'" ....

C'l( '" ....t ~ Cj

l aLi :c~ C7

( '" "E ~ ct'C '" "-Ll.

~ f\.S---"" XI /0 Jl 44~utS60q(6)

Fig. 5.3-20 BB OSC AND FILTER Component Location

5-42

I I I I I I I I I I I I I

SECTION 5 REPAIR BB GENERATOR-Z8

Z8 TO Zll BB OSC AND FILTER

Fig. 5.3-21

- I I JI I

I X,

TAL 03C\ I.---- LOW f"A-5'S FILTER~ t/?V I / -----I-/2V ----/ZV

I() R/ --L 11\ , 9 I >R6

/0

-/ZV Z

100~ CI 0.01

Hr--t

Z/I-JI-/6~ I rv at?1 () I

?SA5"7CJ

LEVEL SET -IZV

I

I _ __________ _ 442U45609 I

~ XI LI, L 2 [3 C4 C5 C6 t7 Co 2.4t1Hz14X42424S 43YT/S5/0{ IOOOfF I~O?F /OOOPF /tXJfF /~OOF;= /SOf'F 3.5fJffflz. ~ c ~ L1 470?F 330fF /OOOPF ?20fF 47tJfF 330fF 4. 4311Hz ~ D '; A 4-70Pf I!;OfF /OOO!'r - 47{JfF IS-OFF S. 611Hz 'l L I; B 470ff 33PF 4-70ff 330f'f 4-70fF 33f'F fj 211Hz '-' N /1 C 330PF /5f'P 470fl /OOFF 330fF /5'fF

/2. 39t1Hl (, Q It f) Z20?f /$FF 330fF 47PF 220?F /SfF

C.L.: Table 6.3-11

5-43

SECIION S REPAIR IF SWEEP GENERATOR-General

5.4 IF SWEEP GENERATOR

5.4.1 General This unit generates the IF signal which is

FM-modulated and frequency-swept by the BB signal and the sweep signal sent from the BB Generator. The 70 MHz/140 MHz qualtz crystal oscillators are also built into the unit.

The block diagram is shown in Fig. 5.4-1. IF SWEEP GENERATOR consists of the following

blocks.

Zl MIX AND AGC consists of a mixer from which IF signal is extracted, a variable attenuator for ALC and a modulator for AM modulator.

Z2 IF AMP is an output amplifying circuit.

Z3 DIVIDER AND PeD AFC LOOP frequency detecting circuit.

Z4 OSC DRIVE CCT consists of Zll and Z12 power supply drive circuits, amplifier for ALC and meter drive circuit.

Z5 COMPARISON CCT consists of ALC CCT for sweep signal and comparison circuit for AFC.

I

Z6 VIDEO AGC consists of ALC CCT for BB signal and drive circuit for AM modulator I Z7 70 MHz/140 MHz X'TAL OSC is a quartz crystal oscillation circuit for 70 MHz and 140 MHz. I Z8 POWER SUPPLY is a circuit for supplying DC voltage. IZ9 BRIDGE is a circuit for rectifying supplied power.

ZlO DIAL CONTROL consists of SWEEP WIDTH I setting circuit, SWEEP CENTER frequency setting circuit, and FM DEVIATION setting circuit. I Zll FM OSC is an oscillator for FM signal.

Z12 SWEEP OSC is sweep signal generator. I Z13 BUFFER AMP

Z14 MOTHER BOARD is a circuit for connecting I between the printed circuit boards.

ZIS DIAL SENS ccr is seal sens change-over circuit I of SWEEP WIDTH and SWEEP CENTER dials.

I I I I I I I I I

5-44 I

I I I I I I

I ~ OUTPUT LEVEL dBm

I AUX IF OUTPUT I

I

I . .. -

(BB INPUT)) A - I from BB-T

(SWEEP INPUT)) A I

I

I IIF OUTPUT I from BB-G) 1-1;1QI

HOUTPUT LEVELl I ALC LOOP IZllI

I FM OSC~FREQ SET)

JZ4 (2/2) I" I" tj-.. I,_----II"--+--~' II IF LEVEL ADJI I

ICRYSTAL OUTPUT I I AM INPUT

Z7I I I I I I I

SECTION 5 REPAIR IF SWEEP GENERATOR-General

BLOCK DIAGRAM OF IF SWEEP GENERATOR

Fig. 5.4-1

%l I PIN BIAS I E

5-45

SECTION 5 REPAIR IIF SWEEP GENERATOR -General I

I

I I I I I

NoTE /I I I

AC 1t 1t V cONfeT/ON

11)0 "... IOOI! I t:Q 5 @to (1(4" ) /(18", 1/711 / Co J' @tD (3 II 7J

117 "" ,z7r / ((1 1" @to (~t/J 8) 20il '"" 21611 z t-, s @t, 6

~/6 ---2'4;' .?3 I, ' I

:CI :/'f ';,0 ,0 L ....//

COI1PA~A"'I/)JtI cc r MHlJ2

I SECTION 5 REPAIR IF SWEEP GENERATOR -Troubleshootinl I

5.4.2 Troubleshooting of IF SWEEP GENERATOR and check the circuit of each block. I Locate points in trouble in the following manner I (1) No I F OUTPUT signal I case 1 AUX I F OUTPUT -10 dBm is normal. "Chec