TechnicalManual

STEREO/MONO POWER AMPLIFIER

RB-1050Table of Contents

Specification

Specification...................................... 1Parts List ........................................... 2~3Adjustment........................................ 3Case Outlines.................................... 4Note On Safety.................................. 4PCB Assembly .................................. 5~6Schematic Diagram .......................... 7~8

Continuous Power Output 70 watts/ch (20 - 20 kHz, <0.03%, 8 ohms)

Total Harmonic Distortion <0.03 %(20 - 20 kHz, 8 ohms)

Intermodulation Distortion <0.03 %(60 Hz : 7 kHz 4 : 1)

Frequency Response (±1 db) 10 Hz - 100 kHzDamping Factor (20-20,000 Hz, 8 ohms) 500Speaker Impedance (Normal mode) 4 ohms minimumSignal to Noise Ratio (IHF A network) 116 dB Input Impedance / Sensitivity 33 k ohms / 1.0 voltPower Requirements 115 volts, 60 Hz (U.S. version)

230 volts, 50 Hz (European version)Power Consumption 250 WattsDimensions (W x H x D) 430 x 92 x 350 mm

1615/16 x 35/8 x 1313/16 ins. Weight (net) 8.1 kg / 17.86 lb.

SHINSEN-BLD. 4F 10-10 SHINSEN-CHO, SHIBUYA-KU,TOKYO 150-0045, JAPAN

Serial. NO.Beginning

®

Quality Uncompromised

Y-329A-000125C/S-S

2

Parts List-1

C601.602C603.604C605.606C607.608C609.610

C611.612C613-616C617.618C623.624C651.652

C653C654C701.702C703C704

C705C706C707C708C901-908

C909-912C913D601-608D609-612D651.652

D653D654D701.702D901.902D903

D904.905F601-604IC651IC701PJ1.2

Q601-606Q607-612Q613.614Q615.616Q619.620

Q621.622Q651.652Q653-656Q657-659Q701-704

Q902R601.602R603.604R605.606R607.608

R609.910R611.612R613.614R615.616R617.618

X-1296-01 PCB ASSEMBLY041 50BGF4R7M 044 TFKP2-2A681H044 FSC160V221H041 25BGF100M044 FSC160V331H

041 50BGF10M044 FSC160V561H044 FSC160V471H044 KT18-2A104K041 UTES1E100-FB

041 UTES1E101-FB041 UTES1E470-FB044 50MSAN104J042 TP50V183J041 UTES1E100-FB

044 50MSAN104J042 TP50V103J041 TUTES1C471-TF041 UTES1E101-FB043 TC500V103

041 ALC20S1022DF ※041 UTES1J221034 T1N4148-86034 T1N4003-TB034 T1N4148-86

034 TRD5.6JST1034 T1N4148-86034 T1N4148-86034 BR84 ※034 T1N4148-86

034 T1N4003-TB※036 5ST3.15※031 MPC1237HA031 NJM555D066 4TR-2709#3

033 TC2362-FG033 TA1016-FG033 B631-EF033 D600-EF033 TC3478A-LKU

033 TA1376A-LKU032 TC536-FG032 TA608-FG032 TC536-FG032 TC536-FG

032 TC536-FG054 EE10-102054 EE10-333054 TMFR4470R054 TMFR401K5

054 TMFR4270R054 TMFR4220R054 TMF1/4-5600F054 TMFR401K5054 TMFR4270R

CAPACITOR ELEC.50V4.7UFCAPACITOR FILM 100V680PFCAPACITOR STYROL 160V220PFCAPACITOR ELEC.25V100UFCAPACITOR STYROL 160V330PF

CAPACITOR ELEC.50V10UFCAPACITOR STYROL 160V560PFCAPACITOR STYROL 160V470PFCAPACITOR FILM 100V0.1UFCAPACITOR ELEC.25V10UF

CAPACITOR ELEC.25V100UFCAPACITOR ELEC.25V47UFCAPACITOR FILM 50V0.1UFCAPACITOR MYLAR 50V0.018UFCAPACITOR ELEC.25V10UF

CAPACITOR FILM 50V0.1UFCAPACITOR MYLAR 50V0.01UFCAPACITOR ELEC.16V470UFCAPACITOR ELEC.25V100UFCAPACITOR CERA.500V0.01UF

CAPACITOR ELEC.50V8200UFCAPACITOR ELEC.63V220UFDIODEDIODEDIODE

ZENER DIODEDIODEDIODEBRIDGED DIODEDIODE

DIODEMINI FUSE 250VT3.15AIC(PROTECTION)IC(TIMER)2P PINJACK

TRANSISTOR(2SC2362K-FG)TRANSISTOR(2SA1016K-FG)TRANSISTOR(2SB631K-EF)TRANSISTOR(2SD600K-EF)TRANSISTOR(2SC3478A-LKU)

TRANSISTOR(2SA1376A-LKU)TRANSISTOR(2SC536K-FG)TRANSISTOR(2SA608K-FG)TRANSISTOR(2SC536K-FG)TRANSISTOR(2SC536K-FG)

TRANSISTOR(2SC536K-FG)RESISTOR METAL 1KRESISTOR METAL 33KRESISTOR METAL 1% 470RRESISTOR METAL 1% 1.5K

RESISTOR METAL 1% 270RRESISTOR METAL 1% 220RRESISTOR MRS25 560RRESISTOR METAL 1% 1.5KRESISTOR METAL 1% 270R

R619.620R621.622R623.624R625.626R627.628

R629.630R631.632R633.634R635.636R639-642

R645.646R647.648R651.652R653.654R655-658

R661.662R663.664R665.666R667.668R669.670

R671.672R673.674R675.676R677.678R679

R680R681R682R683R684

R685.686R687.688R701.702R703R704

R705R706R707R708.709R710

R711R712R713R720R901

R902R903R904R905R921

RY601RY901SP1TH651.652VR601.602

054 TMFR4220R054 TMFR4047K054 TMFR4100R054 TMF1/4-6801F054 TMF1/4-3901F

054 TMFR4100R054 TMFR4001K054 TMFR4047R054 NIR2-0.22JF054 NIR2-0.22JF

054 NIR2-0.22JF054 1WS10JF054 TMFR4012K054 TMF3300054 TMFR4220R

054 TMF8200054 TMF2202054 TMF1502053 CR14-681J-A053 CR14-273J-A

053 CR14-122J-A053 CR14-472J-A053 CR14-473J-A053 CR14-104J-A053 CR14-153J-A

053 CR14-563J-A053 CR14-153J-A053 CR14-104J-A053 CR14-474J-A053 CR14-682J-A

053 CR14-182J-A053 CR14-124J-A053 CR14-104J-A053 CR14-224J-A053 CR14-124J-A

053 CR14-103J-A053 CR14-101J-A053 CR14-473J-A053 CR14-104J-A053 CR14-105J-A

053 CR14-473J-A053 CR14-564J-A054 1WS3.3KJF054 1WS3.3KJF053 CR14-223J-A

054 1WS1.5KJF053 CR14-822J-A054 ERQ12AJ2R2P※054 1WS1.5KJF053 CR14-222J-A

063 DH2TU-24063 DH2U-24※067 C-4493A00034 TTC-503051 SFR002-222

RESISTOR METAL 1% 220RRESISTOR METAL 1% 47KRESISTOR METAL 1% 100RRESISTOR MRS25 6.8KRESISTOR MRS25 3.9K

RESISTOR METAL 1% 100RRESISTOR METAL 1% 1KRESISTOR METAL 1% 47RRESISTOR METAL 2W 0.22RRESISTOR METAL 2W 0.22R

RESISTOR METAL 2W 0.22RRESISTOR METAL 1W 10RRESISTOR METAL 1% 12KRESISTOR METAL 330RRESISTOR METAL 1% 220R

RESISTOR METAL 820RRESISTOR METAL 22KRESISTOR METAL 15KRESISTOR CARBON 680RRESISTOR CARBON 27K

RESISTOR CARBON 1.2KRESISTOR CARBON 4.7KRESISTOR CARBON 47KRESISTOR CARBON 100KRESISTOR CARBON 15K

RESISTOR CARBON 56KRESISTOR CARBON 15KRESISTOR CARBON 100KRESISTOR CARBON 470KRESISTOR CARBON 6.8K

RESISTOR CARBON 1.8KRESISTOR CARBON 120KRESISTOR CARBON 100KRESISTOR CARBON 220KRESISTOR CARBON 120K

RESISTOR CARBON 10KRESISTOR CARBON 100RRESISTOR CARBON 47KRESISTOR CARBON 100KRESISTOR CARBON 1M

RESISTOR CARBON 47KRESISTOR CARBON 560KRESISTOR METAL 1W 3.3KRESISTOR METAL 1W 3.3KRESISTOR CARBON 22K

RESISTOR METAL 1W 1.5KRESISTOR CARBON 8.2KFUSIBLE RESISTOR 2.2RRESISTOR METAL 1W 1.5KRESISTOR CARBON 2.2K

RELAY (SPEAKER)RELAY (POWER)SPEAKER TERMINALTHERMISTORSEMI-FIXED RESISTOR 2.2K

SYMBOL PARTS NO. DESCRIPTION SYMBOL PARTS NO. DESCRIPTION

3

Parts List-2

C710D703.704

HJ1.2IC702Q705.706Q707R714

R715R716R717R718R719

R757S701

VR001.002

C001S901

Q617.618Q623.624Q625.626Q627.628Q631.632

069 C-3417A

X-1296-02 PCB ASSEMBLY041 UTES1H2R2-FB034 T1N4148-86

065 YKB21-5103A031 PC817B032 TA608-FG032 TC536-FG053 CR14-102J-A

053 CR14-471J-A053 CR14-103J-A053 CR14-473J-A053 CR14-104J-A053 CR14-102J-A

053 CR14-224J-A064 C-4660A00

X-1296-03.04 PCB ASSY051 C-4170A31

X-1296-05 PCB ASSEMBLY044 DE1307E472M※061 C-4176A08※

HEAT SINKER ASSEMBLY032 D1953032 C4793032 A1837033 D1047-DE033 D1047-DE

FUSE CLIP

CAPACITOR ELEC.50V2.2UFDIODE

MINI JACKPHOTO COUPLERTRANSISTOR(2SA608K-FG)TRANSISTOR(2SC536K-FG)RESISTOR CARBON 1K

RESISTOR CARBON 470RRESISTOR CARBON 10KRESISTOR CARBON 47KRESISTOR CARBON 100KRESISTOR CARBON 1K

RESISTOR CARBON 22KSLIDE SWITCH

VARIABLE RESISTOR 50KB

SPARK KILLERPOWER SWITCH

TRANSISTOR(2SD1953)DRIVER TRANSISTOR(2SC4793)DRIVER TRANSISTOR(2SA1837)POWER TRANSISTOR(2SD1047-DE)POWER TRANSISTOR(2SD1047-DE)

Q633.634Q637.638

033 B817-DE033 B817-DE017 RM4-18B00019 TO-126019 TO-3P

OTHERS011 FP-508011 TJ3-01A00012 RV4-09A00014 C-4713A01

014 RM4-07B00015 RP-369019 4TR-2823#2019 4TSH-19#2022 T-1055U01※

034 LTL1214A034 SEL1124R063 A-0710W-10A※069 C-4629A01※072 C-4621A01※

072 C-4622A01※072 C-4623A01※072 C-4624A01※081 TJ3-10A00081 Z-204

POWER TRANSISTOR(2SB817-DE)POWER TRANSISTOR(2SB817-DE)HEAT SINKER BOARDINSULATION SHEET(S)INSULATION SHEET(L)

SUB PANEL ASSYH/S PANEL ASSYPUSH KNOB 14FUPPER COVER

BOTTOM BOARDREAR CHASSISPLASTIC FOOT 24FPLASTIC FOOT 50FPOWER TRANSFORMER

LED 2FLED 1X5BREAKERAC INLETAC CORD SET for STD

AC CORD SET for AUSTRALIAAC CORD SET for UKAC CORD SET for CEEINSIDE CARTON STYROL MOULDING

SYMBOL PARTS NO. DESCRIPTION SYMBOL PARTS NO. DESCRIPTION

NOTE ON SAFTY : Symbol ※ Fire or electrical shock hazard. Only original parts should be used to replaced any part marked with symbol ※ .Any other component substitution (other than original type), may incease risk of fire or electrical shock hazard.

Instruments : DC milli–voltmeterNotes : Prior to Bias Adjustment, run about 5minutes with rated output(8ohms) and

warm up Power Transistor and Heat Sink. Set input off.

Step

TP1

TP2

X-1296-01 PCB VR601

VR602X-1296-01 PCB

1

2

Coupling Location Adjust forAdjust

DC milli–voltmeter reads 4mV

Adjustment

4

Case Outlines

Service Note

Cautions during Inspection and Repair

1. Keep in mind the safety warningsThe safety instructions are shown as the labels or printings on the exterior, the inside chassis or the parts, etc. Refer to the instructions when proceeding with inspection or repair.

2. Use only the specified parts for replacementThe selected parts are used at critical area to reduce fire hazard or electrical shock. So when replacing these parts where designaged with marks or ※ marks on the schematic diagram or the parts list, ensure to use only the same parts.

3. Ensure to dress back the AC (Mains) cord to the original positionIf for some reason, the AC cord is moved or partially disassembled, ensure to re-route or assemble back to the original position. The AC cord area is protected and secured by tubing and insulation materials for the sake of safety, so that no loose wire will touch and cause fire hazard and electrical shock.

4. Check for safety aspects after inspection or repairEnsure all parts, such as screws or wires, removed during inspection or repair are secured back to the original positions, and check visually for any anomaly. Also check for any electrical leakage or resistance to maintain the safety.

2SA608K2SA1016K2SA1376A2SC536K2SC2362K2SC3478A 2SB631K

2SD19532SD600K

2SA18372SC4793

2SB8172SD1047

PC817B NJM555D MPC1237HA

5 6

PCB Assembly

7 8

Schematic Diagram