MANUAL SERVICIO EKG BURDICK EK10.pdf

8/20/2019 MANUAL SERVICIO EKG BURDICK EK10.pdf

http://slidepdf.com/reader/full/manual-servicio-ekg-burdick-ek10pdf 1/39

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Service

Manual

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CONTENTS

GENERAL

INFORMATION

PAC

Basic

System

Description

..............

Block

Diagram..............

Soecifications...............

SERVICE

Safety

and

Service

Cautions

.......................5

Tools and Test

Equipment.......,.....

............

5

Printhead

Disable.......

............

5

Automatic

Shutdown

Disable

..............,.....

5

Setup

for

24OV 50/60H2

.....,.............

...,.,.. .5

SAFETY

AND PERFORMANCE

CHECKS

Chassis

Leakage.....

.................6

Patient

Leakage

..................,....6

Printhead

Dot

Test......

..............6

Printhead Protection

Test............

............. ..6

1

1.1

1.2

LJ

2

2.1

2.2

¿.J

2.4

2.4

3

3.1

3.2

3.3

J.+

-

3

)

I



EK

1

0

Et

e c

trocardiog

rap,

h

THEORY

OF OPERATION

I

8.1

8,2

QA

ó.b

8.7

SCHEMATICS

AND

COMPONENT

DIAGRAM

Power

Supply

Circuit

Schematic..

.............28

lnput

Circuit

Schematic

..........28

I

nput

Circuit Schematic

(continued)

.......................28

Logic Circuit Schematic

.........28

Logic Circuit Schematic

(continued)

.........28

EK10

PCB

Component

Diagram

(prior

to

Rev.

D).......

.....,..............28

EK10

PCB

Component

Diagram

(Rev,

D

and

after)...

.....................28



Seruice

Manual

I

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I

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,1

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Fl

1

GENERAL

INFORMATION

1.1 BASIC

SYSTEM

DESCRIPTION

The

EK10

is

a

single channel electrocardio-

graph

which

uses a thermal

array

wr¡t¡ng

sys-

tem to

print

standard

electrocardiograms.

An

optional

nicad

battery allows the

EK10

to

oper-

ate

independently of the

AC

power

line for

about

an

hour

(long

enough to acquire approxi-

mately 50

ECGs)

before recharging

is neces-

'sary.

A

single

pr¡nted

circuit board

assembly,

the

EK10

PCB,

contains the

main circuitry

for

the

system.

The 12.5V

nicad

battery

provides

power

when

an

AC

power

source

is not con-

nected, This battery is recharged whenever the

EK'10

is

plugged

into

an

AC

line

and the power

switch

is

ON.

A logic

switch allows

the battery

to

charge continuously, even

when the

rest

of

the circuitry

is inactive.

Overcharge

protection

is

built-in.

ECG data signals

are

acquired,

amplified,

fil-

tered, and digitized before

being

processed

further

by the

system. A microprocessor han-

dles control functions. Operator

prompts

and

menus

appear

on a 2-line

by

2O-character

liq-

uid

crystaldisplay.

User

inputs

are

provided

by

means

of a

membrane

switch

keypad.

ECG

recordings

are

printed

by

the

writer

assembly,

whích consísts of a

48mm

thermal array

print-

head

and a

DC motor.



EK

1

0

El

e ctrocardi

og

rap

h

1.3

SPECIFICATIONS

Dimensions:

Weight:

Power Requirements:

Mains voltage

fuses:

Battery

fuse:

Operating

tem

perature:

Storage

temperature:

Relative

humidity:

Frequency

response:

Input impedance:

Electrode offset

tolerance:

A/D

conversion:

Signal output

(version

2

only):

11" x

13"x

$3/16"

9lbs.

including

optional battery

110-120

I

220-240VAC

50/60H2

standard, 30VA

2.SVdc

nickel-cadmium

battery

(optional)

110-120V 2 x 0.3A slow blow,

3AG

220-240V,2

x

160mA

time

lag,

type

T

110-120V 24

slow

blow

3AG

220-240V,24 time

lag,

type

T

10"C

to

40'C

-34'C

to

70"C

15%

to

90%

non-condensing

meets

or exceeds AAMI standard (unfiltered)

.04H2 to

30H2,

-3dB (filtered)

greater

than

50M

ohm

*300mV

B

bits

1V

out

per

1mV

input,

r10%

gain

connector,

9-oin

D-subminiature



Service

Manual

t

t

p

t

t

i

I

;-

I

t

t

h

0

2 SERVICE

2.1

SAFETY AND

SERVICE

CAUTIONS

CAUTION

-

Power

line

voltage

is

present

on

the

EKl0

PCB.

Main voltage

can be

encountered

at

the fuse,

power

switch, and

power

transformer.

Always

ensure that

the

unit

¡s

unplugged

whenever

you

are disas-

sembling

it.

The

EK|0

uses

CMOS

integrated

circuits

and caution

must

be

taken

dur¡ng

mainte-

nance

procedures

to

prevent

damage

which

can be

caused by static

electr¡city.

An

anti-static

work

surface

is

recommend-

ed.

Use

only Burdick-approved

thermal

ECG

recording paper.

Wax-coated or

blush-coat-

ed

paper

will

damage

the

printhead.

2.2

TOOLS AND

TEST

EQUIPMENT

The

EK.l0 requires only

standard

electronics

tools

for

maintenance

to

the board

level.

The

following

is

a

list

of suggested test equipment.

Note:

the

printhead

can

be

re-enabled

onl'¡

by

turning the

unit

OFF

and

then

ON

again.

3.

Return

to

the

main menu by selecting

RTNI.

2.4

AUTOMATIC

SHUT

DOWN DISABLE

The

EK10

automatically shuts down

(returns

to

standby)

after 15

minutes if

no

keys

are

pressed.

For

convenience during

repair

ses-

sions, this

feature

can

be

disabled as

follows:

1.

From

the

main menu,

press

front

panel

ke-vs

V4

and

V6

simultaneouslv

to enter the Test

&

Setup

Menu.

2.

Press

the

V4 key

and

the

EK.l0

v¡ill

display

a

message indicating

that the

15 minute

shut

down

is

disabled,

Note:

the automatic

shut

down can

be

re-

enabled only by turning the

unit

()FF

and

then

ON again.

3.

Return

to the

main menu

by

selecting

RTN.

2.5

SETUP FOR

24OV

5O/6OHZ

The

EK10

can

be

configured

easíly

for

opera-

tion at 240V

50/60H2 according

to the

following



EK

1

0 Ele ctroc ardi

og

ra

p

h

3

SAFETY

AND

PERFOR.

MANCE CHECKS

NOTE

-

Leakage

tests

should be

conducted

with

a high

quality

meter

or

safety

analyzer

capable

of testing to

AAMI specifications.

lnappropriate meters can

produce

erro-

neous leakage

readings.

Leakage

tests

should be performed

at a

non-conductive

work

station.

WARNING

-

Use

caut¡on

when

conducting

/hese

fesfs.

The meter

must

be

suitably

insulated

and

capable

of

withstanding

the

power

line voltage.

3.1

CHASSIS LEAKAGE

1. Turn

the EK10

rear

panel power

switch ON.

2.

Connect

a

leakage meter

between the

rear

panel

chassis

ground

iack

and

power

line

ground.

Ensure that

leakage

current

is less

than

1@pA.

3.

Open

ground

line

and ensure

leakage

cur-

6.

With

reversed

polarity,

open ground

line

and

ensure

leakaoe

current

is less

than

2AuA.

3.3

PRINTHEAD

DOT

TEST

This

test can be used to determine

if

all the

indi-

vidual

printhead

dots

are

functioning

properly.

1.

From

the

main menu, press front panel

keys

V4

and

V6

simultaneously to enter

the

Test

& Setuo

Menu.

2.

3.

Press

the

Lead

I

key

to

initiate

test.

The writer

will

print

a

diagonal

line,

which

should

be

inspected

for

continuity,

Fading

at the top

or

bottom of

the

page

indicates

that the

printhead

is

mis-aligned.

Individua,

dots

or

groups

of

dots

which

do

not

print

indicate

a

problem

with

the

printhead

con-

trol circuitry

or the

printhead

itself.

Always

ensure that

the

pi'inthead

and

paper

path

are

kept

free

of

dirt or

other

foreign mater¡al.

For

additional

information,

refer

to

section

6

Maintenance.

Return

to

the

main menu

by selecting

RTN.



Service Manual

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4 PROBLEM

SOLVING

4.1

TROUBLESHOOTING

Past

experience

has

shown

that

a

large

per

centage

of

service

calls

are

due to

poor

ECG

technique and

broken

cables.

Before

disassem-

bling

the electrocardiograph,

ensure

that

tech-

nique

and

faulty

cables

are

eliminated

as

the

source

of

the

problem.

Refer

to

the Operator's

Manual for additional

information,



EK

|

0

Ele ctrocard

i

og

rap

h

4.1.1

Display

I )I

SPLAY

IS

COMPLETELY

BLr''NK

I)UNDDK EK\O

PLUCGED

IN AND

IIFAR

PANEL

rcWEB

SWI|CH

ON?

WTH

POWER

OFF

CHECK

ALL

INTERNAL

CONNECTIONS.

APPLY

rcWER.

STILLBUNK?

O PT O NAL B,{TTERY

N S

TAUE

D? TURN

ON

AND PI-UG IN

EATTEEY FULLY CHARGED?

1 O.

I

2V

ACROSS TERMINAL?

RECHARGE

OR

REPUCE



Service

Manual

4.1.1

Display

(cont¡nued)

SUPPLY VOLTAGES OK?

APNOX

+5V

Af

1C2.1,

+5V

ACBOSS C3l,

+8V

AÍ

lCí.l.

AND-8V

Af

D6.4

FAULW

rcVEB

SUPftY CINCUÍRY

FAULTY LOGIC

CIRCUINY ON

CN

PCB

DISABLE

PRINTHFAD.

ffiESS

MANUAL,

ÍHEN

STAP.

DID WITER

MOTOR

ACTMATE?

tc26.e

us.6)

snoBED

HtGH

APnOX.

NERY

t)rns?

tc28.s snoBEo

H|GH To

LOW? FAULTY IC26

AB

LOGIC

CIRCUITRY

ON

CPU

rcB



EK 1

0

El

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ctrocardiog

rap

h

4.1.2

Writer

(

,;i:

WRITER

DOES

NOT PfrNT,

BUÍ PAPEB

ADVANCES

AP%OX.

t0.t6V

AT

J2.14? DISCONNECI WRITER

CABLE

Af

J2.

APffiOX

t0-t6v AT J2.14?

FAULIY

PRINTHEAO

FAULTY POWER

SUWLY

DISABLE

PRIN'|HEAD. PRESS

MANUAL

ARE

LAGIC

SIGNALS

AT J2.6,

J2.1,

AND J2.8 SWJTCHING?

MUTLIftE FAILURES

ON CPU

rcB

AND,OR WNITER



EKl0 Electrocardiograph

ji*;

4.2

WAVEFORMS

AND

TESTPOINTS

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SYSTEM

TIMING

EKlO

IC4#6

EKIO

ADTXO &

ADSCLK

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EK

1

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ctrocardiog

raph

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4.3

CONNECTOR

PINOUTS

EKIO PC

BOARD

Connector Pln#

J1

(ver.

2

only)

1

7

DescripJlon

'1V

output

Chassis

ground

Printhead strobe

Printhead

strobe

Chassis

ground

Transmit

data

line

Chassis

ground

Data latch

signal

+5V

Serial

clock

Printhead

strobe

signal

Temp.

sense

to

processor

Thermistor

ground

Printhead

ground

Pri nthead

supply

voltage

Pr¡nthead

ground

Printhead

supply voltage

1

I

¿

4

7

T

B

o

10

11

IJ

.A

t+

to

Name

1V

OUT

GND

STROBEl

STROBE2

GND

TXD

GND

LATCH

VDD

¡ULÑ

STROBE3

THERMISTOR

THERMGND

PHGND

VH

PHGND

VH



Service

Manual

I

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t

4.3 CONNECTOR

PINOUTS

(CONTINUED)

\

f

Connector

Name-

VDD

VD

AO

A1

E

LDT.LDO

KEYBD4-O

POWER

GND

KEYBDd.a

SHIELD

J6

Pln#

1

z

A

6

6

a aA

.tc

l-J

6

ó-ll

t¿

Descrlotion

Ground

+5V

supply

to

LCD

Adiust

LCD control

signal

LCD control

signal

LCD

control

sígnal

LCD

data

lines

Keyboard

row lines

Front

panel power switch

Chassis

ground

Keyboard

column

lines

Earth

ground



EK

1

0 Ele ctroc

ardi

og rap

h

5

REMOVAL

AND

REPLACE.

MENT

PROCEDURES

5.1

BEMOVAL AND REPLACEMENT

CAUTION

-

Always

ensure that

unit

is

unplugged

prior

to

performing

any disas-

sembly.

NOTE:

When

removing connectors or

wires

from

PC

boards, observe and

mark their

position.

Careful

observation

will

prevent

wire

or connector

reversal durino re-assem-

bly.

NOTE:The EK10

uses

CMOS

integrated circuits

and

cautton

must

be

taken

during

mainte-

nance

procedures

to

prevent

damage

which

can

be caused by

stat¡c electricity.

An anti-static

work

surface

is

recommend-

ed.

5.1.1

Top Enclosure

1,

Remove

paper

compartment cover

and

uducr,

2.

Turn

the EKlO

on

its

back.

Remove

two

(2)

halves

together.

Failure

to

do

so

may

dam-

age

the

wires.

5.1.2

LCD

Module

1.

Remove the

top enclosure

as

previously

described.

2.

Remove cable

connecting

the

LCD module

to

the

EK10

PCB.

3.

Gently

unsnap

LCD

module

from

its retainer

posts

on the top enclosure and

remove.

4.

Replace

in reverse

order.

5.1.3

Writer Assembly

CAUTION:The

printhead

is

susceptible

to

dam-

age

from

static

electr¡city.

An

ant¡-stat¡c

work

surface

is

recommended.

1.

Remove

the

top

enclosure as

previously

described.

2.

Release

latches on

either side

of

the

writer

assembly and

carefully slide

upwards

in

slots

to

access

connector.

3.

Remove

connector on

EKlO

PCB

atlaching

motor.

Remove

ground

wire

attached to

hr

el

\Fh



Service

Manual

4.3

CONNECTOR

PTNOUTS

(CONTTNUED)

Connector

Name

v55

VDD

VD

AO

A1

E

LD7-LDO

KEYBD4.O

POWER

GND

KEYBDd-a

SHIELD

J6

Pln#

1

¿

3

4

5

o

a 1t

,- l$

1-5

6

7

B-1

1

12

D.escription

Ground

+5V

supply

to

LCD

Adjust

LCD control

signal

LCD

control

signal

LCD control

signal

LCD

data

l¡nes

Keyboard row lines

Front

panel

power

switch

Chassis ground

Keyboard

column

lines

Earth

ground



the unit

so

the

weight

of

the

battery causes

lhe

cover to

drop out

of

place.

Use

a

long-nose

pliers

to

disconnect

the

battery terminal connector

from

the

PC

board. CAUTION:

Pullon

the

connector,

not

the

wires themselves.

5.

Replace in reverse order.

NOTE:

Ensure

that

battery

terminalwires

are

properly routed in the compartment

cover.

The wires

are

damaged

easily

if

they

become

trapped

between

the cover

and

main

assembly,

5.1.5

EK10

PCB

1.

Remove

the

battery

as

previously

described.

2.

Remove

the top

enclosure

as

previously

described.

3.

Remove

the

writer

assembly

as

prevíously

described.

4.

Unplug

connector

on

EK10

PCB

attaching

LCD module.

Lift

the

EK10

PCB

up

and out of

bottom

enclosure.

Replace in

reverse

order.

NOTE:After

replacing

the

EK10 PCB,

adjustments will be necessary.

Refer to

printhead

voltage

and motor

speed

adjustments

on

page

20

5.1.6

Battery

Fuse

The

battery

fuse is

located

on

the

EK10 PCB.

Refer

to

the

previous

instructions for

EK10 PCB

removal.

lf replacement

is necessary,

use

only a

fuse

of

the

same type and

rating.

5.1.7 Power Llne

Fuses

The

oower

line

fuses are accessible from

the

bottom

of the

EK10.

lf

reolacement

is

neces-

sary, use

only

a fuse of the

same type and

rat-

ing.

1.

Ensure

that the

unit

is

unplugged.

2.

Turn

the

EK10

on

its

back

and

locate

the

fuse

access cover

at

the corner of

unit.

o.

7.



EKl

0

Electroca

rdiograph

l'.

5,2 EXPLODED

VIEW

007514

|j-Lead

Patient Cable

007958

Thermal

ECG

PaPer

(150ft.)

C47262

Pwer

Cord

833007

Line Fuse

833098 Line Fuse

(odd

voltage)

8330'f 4

gattery

Fuse

862276

Paper

Spool

862330

Top

Enclosure

w/membrane

switch

862302

LCO Module

AssemblY

8625'f

2

Paper

ComPartment

Cover

862282

Thrust

Eearlng

862269

Platen

Roller

862332

Paper

Drive AssemblY

I

n

;



Seruice

Manual

r

lr

ir

Ir

n

ffl

:):/

6

MAINTENANCE

6.1 PREVENTIVE

MAINTENANCE

The

purpose

of

preventive

maintenance

is

to

eliminate

future

problerns

as

much as

possible

and to

keep

the

equipment

in

good

operating

condition.

This ensures

safe

and satisfactory

ECG

recordings.

THE FOLLOWING

PREVENTIVE

MAINTE-

NANCE CHECKS

SHOULD

BE

CARRIED

OUT

AT

LEAST ONCE

A

YEAR:

.

Visual insoection

.

Cleaning

.

Check

power

cord

.

Check

patient

cable

.

Check

leakage currents

Simple

maintenance routines, normally

per-

formed

darly

or

weekly

by

the

user,

are

described

in the

Operating

lnstructions.

In

the

event

of a malfunction,

refer

the

repair

to

an

authorized

Burdick

Service

Representative.

6.1.1

Msual

Inspection

.

Soft,

lint-free

cloth

.

Polishing cloth

.

Distilled

water

.

Mild detergent

solution

.

Soft

brush

Disconnect

the

AC

power

cord

before

attempt-

ing

any

cleaning. Clean

the

housing

with

a

damo cloth.

Do

not

use

abrasive cleaners

or

polishes.

Wipe

dry

with

a soft,

clean cloth.

Also,

wipe the

paper

compartment.

CAUTION:Avoid putt¡ng any liquids such

as

alcohol

or

solvents

directly

onto

the unit.

Contamination

from

liquids

may

result

in

severe

electrical

damage.

6.1.3 Power

Cable

Check the

power

cord

and appliance

inlet for

any

visible

signs

of deterioration,

loose

connec-

tions, or burn

damage.

6.1.4 Patient

Cable

Check

the

patient

cable

and

input connector

for

any

visible

signs

of damage

or

loose

connec-

tions.

Disconnect the

patient

cable

from

the

unit

and inspect

it for short

circuits, broken

wires, or



EK

1

0 El

e

ctrocardiog

raph

will

provide

approximately

one

hour of

continu-

ous

service

(about

50

ECG recordings

in

AUTO

mode).

Approximately

15

hours are

required to

fully

recharge

the

battery.

NOTE:

The

EK10

can be

operated under

AC

power

without affecting

the charge

time.

However, if

the

battery becomes

completely

discharged, the

unit

will

not operate

even

under

AC

power.

About once every

6

months, the

EK10 should

be

allowed to

run

on battery

power

until

the

low

battery

indicator

(LB)

is

displayed on

the

main

menu.

Then recharge the

unit.

This

ensures

that

the

battery

will

operate

at full

capac¡ty.

Under

normal

circumstances,

the

battery's

life

expectancy

is

3

-

5

years.

6.4

PRINTHEAD VOLTAGE

ADJUSTMENT

lf

a

message indicating

high

or

low

printhead

resistance

is

displayed

when

the

EK10

is first

powered

up,

the

printhead

voltage

needs

adjustment.

Since

individual

printheads

vary in

resistance,

this

adjustment also

is

necessary

',vhenever

the EKlO

PCB

or

printhead

has been

lf necessary,

adiust

R109

until the

dis-

played

value

matches the

value

indicated

on the printhead. A

hole in

the battery

com-

..

partment

is

provided

for

access

to

R109.

To

terminate

the

adjustment

procedure,

press

STOP.

Return to the

main

menu

by

selecting

RTN.

6.5 PAPER

SPEED

ADJUSTMENT

This adlustrnent

should

be

performed

after

repair

or

replacement

of

the

EK10

PCB

or

writer

assembly.

lt

allows the

paper

speed to

be

adiusted

for

both

25mmis

and

50mm/s.

From the

main menu,

press

front

panel

keys

V4

and

VO

simultaneouslv

to enter the

Test

&

Setup

Menu.

Select

SPD

to

display

the

Speed Adjust

Menu.

From

this

menu.

select

either

25mm/s or S0mmis.

The writer

will

print

a

contlnuous strip of

cal-

ibration lines

until the STOP

key

is

pressed.

At

25mm/s the

marks

should

be Smm apart,

with

25mm

between the

large

tic

marks. At

SOmmis they should be

1Omm

apart,

with

+-

1.

2.

4.



Service

Manual

6.6

ADJUSTMENT

LOCATIONS

The

following

adjustments

can be

accessed

írom the battery compartrnent:

A

-

50mm/s speed

adiustment

(R122)

B

-

25mm/s speed

adjustment

(R121)

C

-

Printhead

voltage

adjustment

(F109)

Also. refer

to

sections

8.6

and

8.7 EK10 PCB

Component

Diagram

for

the

location

of these

comDonents.

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EK

1

0

El

e

ctrocardiog

rap

h

7 THEORY

OF OPERATION

7.1 EKl

O

PCB

Allof

the circuitry

for

the EK10

Electrocardio-

graph

is

contained

on a single

printed

circuit

board, the

EK.l0

PCB.

For

the

purpose

of

dis-

cussion,

the

circuitry

on this

board

can

be

iden-

tified as

follows:

power

supply,

amplifier,

micro-

processor, keyboard interface, motor

control,

orinthead

control,

and

LCD

¡nterface.

7.1.1

Power

Supply

The

EK.l0 can be

operated

at

line

voltages

of

120VAC

or

24OVAC. Jumpers

select

the

appro-

priate

setting.

The

line

voltage is applied

to

transformer

T1

through fuses

F1

andF2

and

the

rear

panel

power

switch,

S1.

An inductor

filters

electromagnetic

¡nterference

that

is radiated

from

the

power

line. The

transformer

secondary

provides

17VAC

to

rectifier

D1

,

The

rectifier

and

C1

produce

an unregulated

23V at

the

input

of

lC1,

a

voltage

regulator.

R2

provides

a current

path

for

D3

and

D4,

which together

form

a

13.6V reference.

CG

provides

ripple

filtering for

R10

debounce the

circuit.

Once the logic switch

is

on, power is

available

to

ail

the circuits at the

drain

of

Q6.

The logic

switch

can be turned off

by

pressing

the

front

panel power

ON/OFF switch

again, or by

the

PWRDWN signal

from

the

microprocessor.

In

either

case,

Q4

is turned off

again.

This

causes

the

output

of

lc3 at

pin

13

to

return

to

a

high

condition,

turn¡ng

off

the

logic

switch

Q6.

The

+5V power supply

is

generated 6y

lCZ,

which

has

an

internal

oscillator

that

produces

a

+SVDC

output through

DB,

L1

,

and

C22.

R14

and

R'f

5

provide

the

under

voltage

sensor

input.

When

the

output

falls

below

4.4V

Q3

turns

on

to

produce

the

strobe

inhibit

signal,

STRINH.

This

signal

prevents

strobe

pulses

from

enabling

the

printhead,

lf

a strobe

error

is

detected,

the

STRERR signal

turns

on

Q5

to

force the strobe

inhibit.

The

isolated

power

supplies

are

generated

from

lC4, a

pulse

width

modulator.

lts

output

voltage

varies with

the

input

and

load

to

produce

unreg-

ulated

voltages for

three

isolated regulators:

lCs,

lC6,

and

1C45. The logic

supply

voltage is

applied to

lC4

at

pin

7

and to

the isolation

transformer

T2

at

pin

5. R24

and C'l9 determine

T

I

I



:|,

n

rt

r

n

n

ü:;

aod

R27 determine

the

output

voltage.

C24

and

C25

provide

filtering

for

the

+8.5V isolated

sup-

ply. The -8.5V

isolated

supply

is

the

same

as

the

+8.5V

supply except

that

the

ground

and

output

pins

are

reversed

to

yield

a

negative

voltage.

7.1.2

Amplifier

Since

the

input

circu¡try

for each

patient

lead

is

the

same, only

one input is

described

¡n

detail.

The

RA input

is

current

limited by

resistor

R30

and applied

to butfer amplifier

lC7-D.

Diodes

D14

and

D15

protect

against

high

voltage

defibrillator

pulses.

Diodes D1

2

and

D13 are

connected

to each of

the

lead

protection

diodes

and

províde

a current

path

to

the

isolated

ground.

Capacitor

C33

filters out

high

frequen-

cies on the

input

signal.

After

being

buffered,

the limb lead signals pass through a

lead

weighting

resistor network,

RN1,

and

are

applied to

the

lead

select

multiplexers

lClO and

|C11.

The

chest

lead

signals

are

muitiplexed

by

tc12.

lC9-B

detects

when

a

S-lead

patient

cable

is

attached

to

the

input

connector.

The

cable

pro-

vides

continuity

between CSA ancj CSB

to

associated components

are

not

present

on

boards

prior

to

Rev.

D.)

lC34

is

the gain select

multiplexer. The x2,

x1,

andxl12

gain

selections

are

developed

across

a

resistor

divider

network

consisting

of

R94,

R96,

and

R97.

Signals

85

and BG

determine

which

input

signal

at

lC34 will

be

passed

to

the

offset amplifier,

|C16. Signal

87

causes

a

cali-

bration

pulse

by turning

on

Q9.

This

results in

a

1mV input

at

the

lead

select

multiplexel

IC1

1

.

lC'17

is an B-bit

serial analog

to

digital convert-

er.

The

CS

signal

enables the

converter to clock

data

out

to the

isolation

network. This network

provides

the

means

to

interface non-isolated

microprocessor

circuitry

to the

isolated

amplifi-

er.

Signals

are sent

across the

isolation

barrier

with

the aid

of

a

modulator clock.

The isolated

modulator

clock signal,

ISOCLK,

runs at 6MHz

and

is

under control

from

the

microprocessor.

ISOCLK

provides

the

modulat-

ing

signal

to

lC24-8,

which

drives

transformer

TB.

The

output

from TB

is

sensed

by

lC22-C,

which

provides

the

demodulating

clock

for

lC22-A,lC22-8,

and

lC22-D.

The

signal

is

also

sent through

lC21-A

to

serve

as the

modulating

clock

for

the outout

from

1C17. lC21-A

drives

the

output through

T3. This

output

is

sensed

by



i

i

i

:

l

EKl 0

Electrocardiograph

7.1.3

Microprocessor

lC33 is

a

NEC7B310

microprocessor

which

has

4

analog to digital

converters,

3

timers,

DMA circuitry,

serial l/O,

and

peripheral

interface

ports

built

in.

The

microprocessor

controls

the timing

of data

acquis-

ition, handles

input from the front

panel

keyboard, and

sends

the

appropriate output to the

LCD and

thermal

printhead.

A

thermister

provides

temperature

information

to

the

microprocessor,

which can

shut

down

the system

if

the

printhead becomes too warm.

The

system

clock

originates

from

Y1,

a 12MHz

crystal.

The

signal

is

buffered by

lC39 and

lC41

before

being

applied

to

the microprocessor.

lC29

is

the

system

ROM, which contains the operating

pro-

granr

for the microprocessor. lC30

provides

tempor-

ary RAM

storage

for data and

processor

commands.

lC31

latches address

lines A0-A7 when the ALE

signal

from the

microprocessor is

applied at pin

11.

lC2B

produces

an

enable

signal

for the

liquid

crystal

display

when

the

appropriate

address

is

presented

on

lines A13-A15.

7.1.4

Keyboard Interface

Pull-up

resistors in

RN3

provide

+5V

to the keyboard.

before

being

applied

to

pin

3 of

1C37.

A high

from

P37

causes

the motor to stop. Q12

is

the

motor current

driver,

which

is

driven

by the output at

pin

6 of

1C37.

R101

provides

short

cicuit

protection.

7.1.5a Motor Control

(Revision

G)

The

paper

drive can

run

at either 2Smm/sec or

50mm/

sec.

Field

effecttransistors

Q17

and

Q16

selecteither

the

25mm/sec

potentiometer R121 or the S0mm/sec

potentiometer

R122,lf

the S0mm/sec

speed

is select-

ed,

the

50MM/25MM signalfrom

the microprocessor

is

high.

lC39-E

inverts

this

signal so that

the base

of

Q20

is

driven

low

and

the base of

Q19

is driven high.

This

in

turn

causes

the

gate

of

Q16

to

go

high

and the

base

of

Q17

to

go

low.

The

50mmlsec

potentiometer,

R'122, is

thereby

selected.

lf the

2Smm/sec

speed

is

selected,

the

50MM/25MM

signalgoes

low and the

opposite action takes

place

resulting in

Q17

turning

off and

Q17

turning

on which selects the 2Smm/sec

potentiometer,

R121.

lC37

provides

the

constant

speed

control.

The

micro-

processor

(1C33)

turns

the

motor

on

and off

via

the

PAUSE/RUN

signalfrom

its P37

line. To

turn

the mo-

tor on,

the

signal is brought low

and inverted by

Q13

before being applied to

the

gate

of

Q18.

When the

T

F

I

T

q



l#+.¡.1;

¡1&r+9,

r:'

lri.rl.:.i.i

r'l

l¡i;.¡1.1:'

detector

circuitry,

which

is

comprised

of lC23

and

1C32.

The

falling

edge

of

the

strobe triggers

one-shot

lC23 and

is

the D input for

flip flop

1C32.

lf the strobe

pulse

is less

than 2.0ms,

pín

2 of

lC32

is high when

pin

7 of lC23

returns

high, and

the

output

at

pin

6

of

lC32

remains

low.

lf

the strobe

pulse

is

longer than

2.0ms,

pin

2 of

lC32

is

low when

lC23 times out.

This

causes

pin

6

of

lC32

to

go

high,

sending the STRERR

signal

to

P16 of the

microprocessor

and

to

the strobe

inhibit circuitry.

A

reset signal

is applied at

pin

1 of

lC32 during power up

to ensure

that

the

printhead

is

not

strobed

during

this

time.

7.1.7 LCD

Interface

1C26, 1C43, and

lC44

provide

the

interface between

the

microprocessor

and the

liquid crystal

display.

The

A1

address

line to the

LCD is

high for read

operations

and

low

for write

operations. The A0

address

line high

for data and low for

the instruction

mode.

The

LDO-

LD7

data lines

interface

with lC43

during

a write.

During

a

write

operation,

the output at lC44-8,

pin

4,

is high.

This signal

causes

data to be clocked

into

1C43.

When the

output

from lC44-B

returns low,

pin

B

of

lC26-C

goes

low

to

latch

the

data

into

the

LCD.

The liquid crystal

display

has

an

internal

controller

-'jNF&MF-''"



EK

1 0

ElectrocardiograPn

I

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Service

Manuat

7.1.10

EK10

PCB Block

Dlagram

é

8b

Eü



8 SCHEMATICS

AND

COMPONENT

DIAGRAMS

8.1 POWER

SUPPLY

CIRCUIT

SCHEMATIC

8.2 INPUT C¡RCUIT

SCHEMAT¡C

8.2A

INPUT C¡RCUIT SCHEMATIC

(Rev.

D

and

after)

8.3

INPUT CIRCUIT

SCHEMATIC

(continued)

8.4

LOGIC

CIRCU¡T

SCHEMATIC

(Rev.

F

and

below)

8.4A

LOGIC CIRCUIT

SCHEMATIC

(Rev.

G

and

after)

..'-iffi

.,,'l*.ffiH

8.5

8.6

LOGIC

CIRCUIT SCHEMATIC

(continued)

,

K10 PCB

COMPONENT

DIAGRAM

(prior

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Rev.

D)

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MANUAL SERVICIO EKG BURDICK EK10.pdf