NIHON KOHDEN ECG 8830A User manual

SM.ECG8830A.03

Cardiofax

ELECTROCARDIOGRAPH

ECG-8830A

0634-000023C

CONTENTS

Page

Section

GENERAL

1

Introduction

1-1

Explanation

1-2 1-3

Composition

1-4

Fuse

Replacement

SPECIFICATION.

2

THEORY

3

General

3-1 3-2

Control Operation

3-3

Power

3-4 3-5

Regulators

TROUBLE

4

АБЛУ$ТМЕМТ5

5

5-1

Assembly

5-1-1

5-1-2

Assembly

5-2

DIPSwiteh....................

5-3

5-3-1 5-3-2 5-3-3

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

Board

Unit

and

Assemly

Paper

and

DIP

Switch Setting DIP

Switch

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

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

of

Panels

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

OF

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

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

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

SHOOTING

Mechanical

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

Feed

Mechanical

Thermal;

and

Controls

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

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

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

OPERATION

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

ae

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

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

Adjustment

Location

Head

Setting

................................ _ 5.6

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

Resistance

of

Thermal

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

of

Motor

een

and

Head

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

Dip

Switch 1 ..

.....

1.C1

1.1

1.2

1.6

1.7

2.C1

3.C1

3.1

3.2

3.12

3.13

3.18

4.01

5.C1

5.1

5.2

5.3

5.4

5.5

Section

SELFCHECK................................

6

Error

6-1

6-2

Self-Check

7

DISASSEMBLING

MECHANICAL

7-1

Disassembling

7-2

General

7-3

Recorder

7-4

Disassembling

1-5

Disassembling

Messages

Mechanical

Unit

ECG8830A.SM.02

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

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

the

Top

Casing

Part

Mechanical

the

Thermal

the

Mark

AND

PARTS

Assy

List

and

Part

List

Head

Detection

eee

LIST

and

Bottom

Exploded

and

Exploded

Assy

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

Unit,

Motor

6.CI

6.1

6.2

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

Casing

Diagram

Assy

........

Diagram

.........

7.C1

.

...

7.1

7.2

7.4

7.6

C.1

Section

8

ELECTRICAL

ECG-8830A UT-2283 UT-2284 UT-2285 WS-821D

PARTS

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

CONTROL OPERATION POWER RECODER

BOARD

UNIT

LIST

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

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

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

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

........

Lea

Man

8.C1

8.1

8.7

8.10

Section

CIRCUIT

9

ECG-8830A ECG-8830A ECG-8830A WS-821D UT-2283 UT-2283 UT-2283 UT-2283 UT-2283 UT-2283 UT-2283 UT-2283 UT-2283 UT-2283 UT-2283 UT-2283 UT-2283 UT-2283 UT-2283 UT-2283 UT-2284

UT-2284 UT-2285 UT-2285 UT-2285 UT-2285 UT-2283 UT-2283 UT-2284 UT-2285

DIAGRAMS

PARTS

BLOCK CABLE CHASSIS RECORDER CONTROL CONTROL CONTROL CONTROL CONTROL CONTROL CONTROL CONTROL CONTROL CONTROL CONTROL CONTROL CONTROL CONTROL

CONTROL

OPERATION OPERATION POWER POWER POWER POWER

CONTROLBD.........................

OPERATION POWER

LOCATION

DIAGRAM CONNECTION

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

BD BD BD BD BD BD BD BD BD BD BD BD BD BD BD BD

BD

(1/4)

BD

(2/4)

BD

(3/4)

BD

(4/4)

BD

&

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

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

(1/16) (2/16) (3/16) (4/16) (5/16) (6/16) (7/16) (8/16) (9/16) (10/16) (11/16) (12/16) (13/16) (14/16) (15/16)

(16/16) BD BD

BD

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

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

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

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

(1/2) (2/2)

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

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

GUIDE

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

.

ーーーーー

sci

9.1

9.2

9.3

9.4

9.5

9.6

9.7

9.8

9.9

9.10

9.11

9.12

9.13

9.14

9.15

9.16

9.17

9.18

9.19

9.20

9.21

9.22

9.23

9.24

9.25

9.26

9.27

9.28

9.29

9.30

C.2

ECG8830A.SM.02

1.

GENERAL

Introduction

må

2

Explanation

mh

3

Composition

4

FuseReplacement

må

1-4-1

Power

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

of

Panel

and

Controls

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

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

Fuse

Replacement

...

må må

må 2

må

î° må

N

SNO

ECG8830A.SM.02

1-1

Introduction

The

ECG-8830A rechargeable The

enhanced

(1)

Smaller

The

number

enhancing

(2)

NKC

battery

reliability

number

the

custom

is a 3,

and

4,

user

6-channel,

have

of

components

of

components

operational

LSIs

automatic/manual presettable been

realized

is

reliability,

recording

minimized,reducing

and

by

the

making

ECG

mode.

following:

the

number

troubleshooting

recorder

easier.

1.

GENERAL

with a built-in

of

connections,

Newly LSIs enhanced

(3)

Greatly

Unlike amp, and

developed 2 NKC

contains

the

reliability.

reduced

the

conventional

and

other

circuits,

employs a thermal

Multi-layer

printed

equivalent

number

head

circuit

custom

of

LSIs

of

about

adjustments

cardiographs

the

ECG-8830G

on

the

recorder

CAUTION

boards

dedicated

100

discrete

requiring

eliminates

to

are

used

to

the

ICs,

adjustments

the

eliminate

in

this

unit.

ECG-8830G

contributing

of

the

adjustment

the

need

for a main

are

used.

to

the

preamp, of

the

Each

greatly

main preamp amp.

ECG8830A.SM.01

1.1

1.

GENERAL

1-2

Explanation

4

LCD

Display

of

Panels

and

Controls

|

| ( LCD

Battery

A

©

|

Name

DISPLAY

Leads

Off

TOR

aa

QRS

3

mark

w

808

jv

Pe

Lead

Group

E

v

AVL

"avı

ave

|

Xx

Ve

vs

|

Auto

2

Ve

|

vs]

|

v

mark

5

τη

pci”

v

Recording

7

uto

y

Channels

©

|

＊

1.2

PaperEmpty

ON/OFF

(2)

CHG

©

Battery

AC

(4)

AC

Name

Charging

Power

Elapsed

Lamp

Time

Lamp

Heart

CHANNELS

(5)

Channel

INTMT

(6)

Intermittent

Select

PAPER

(7)

Paper

Rate

ECG8830A.SM.02

EMG

Name

Select

RECORD

Recording

Switch

SPEED

Select

Speed

Switch

Filter

Switch

EXTRA

EMG

SENSITIVITY

(9)

Sensitivity

FEED

Paper

Name

FILTER

Switch

Filter

Select

Switch

Feed

Switch

M

B

©

Controls

Г

ONE

and

DANGER)

-

Switches

Explosion

anaesthetics

Risque

d'anesthesiques

cut

d’explosion,

Sac

|

hazard,

Do

not

use

Ne

pas

inflammables,

employer

-

In

the

presence

en

presence

|

of

Flammable

|

1.

GENERAL

OS

A

Os

(DI

O

B

Corr

EJ

CI

|

E

BEE

nn/s

INTHT

CORE

FEED

—

Ou

12

af

B8B

58

+

ISLHW

PAPER

|

OCOPY

(a!

Y

ww

25

|

SPEED

(

06

RESET

Ex

I

Il | avi | Va

IH]

50

EMG

mn/s

06

|

(<

OSTART/STP

ava}

Vili

ave]

Vs]

eww

at

1/4

[FILTER]

SENSITIVITY

PERC

|

LEAD

SELECT

|

Va

ve

Vo,

|

Ex | @

1/24

τε

=)

34

Auto 9 |

yw

1

0

Etre)

CHANNELS

E

|

(I

e

|

/AUTOGAIN

CHECK

«€

OAUTO/MANUAL

[ο

|

(5)

(2)

—®

©

7

(D

RESET

Reset

(2)

Extra

(3)

AUTO

Auto

[

Name

CHECK

Switch

Lead

GAIN

Gain

Select

Switch

Check

05)

COPY

Copy

LEAD

Lead

Switch

SELECT

Select

ECG8830A.SM.02

Switch

(7)

AUTO/MANUAL

Switch

START/STOP

二

Select

Switch

13

1.

GENERAL

©

Left side

panel

2)

@)

(29)

Name

Grounding

Main

Power

Fuse

Holder

Power

Socket

Post

Switch

1.4

ECG8830A.SM.02

1.

GENERAL

Right

©

Rear

|

side

panel

|

panel

，

=

|

O

i

po

=

(25)

Name

Battery

Compartment

PATIENT

Input

Connector

DC/CRO

DC

input,

terminal

CRO

output

ECG8830A.SM.02

1.5

1.

GENERAL

1-3

Composition

|

ECG-8830A

AC-0051

ト

L

—

UT-2283

—

WS-821D

L

ECG-0084Z

UT-2284

UT-2285

RH-821D

Operation

OPERATION

CONTROL

POWER

Recorder

BD

Magazine

Acceso9ries

Unit

BD

Unit

Location

of

components

©

CONTROL

@

POWER

©

OPERATION

BD

1.6

ECG8830A.SM.02

1-4

Fuse

Replacement

CAUTION

1.

GENERAL

Replacement Before

1-4-1

the

Power

should

fuse

replacement,

Fuse

Replacement

be

done

only

by a technical

turn

the

power

Pull

OFF

the

person.

and

fuse

cover

disconnect

off

with a finger.

the

power

cord.

Remove it

with

specified

ECG8830A.SM.02

the

fuse

with a pair

one.

of

tweezers

and

replace

1.7

2.

SPECIFICATIONS

=

WN B V O

G

Amplifier

ecorder

OoOwer

requirment

afety

peration imensions

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

.....

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

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

condition

and

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

weight

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

1.

aaa

N N N

ECG8830A.SM.01

.

1.

ECG

Amplifier

2.

SPECIFICATIONS

Calibration

Input

Electrode

Digital

Freguency

Input

ECG

impedance

Sensitivity

offset

tolerance

conversion

response

Time

constant

EMG

DC

CRD

circuit

leads

voltage

CMRR

filter

input

output

Isolated

and

Standard

I

mV

+2%

=

10

MQ

=

100dB

10

mm/mV

=

400

mV Sampling Aceuracy: Meets

AAMI C,

and D *

0.05

Hz

to

>

3.2

sec.

35

Hz

to

45

20

Hz

to

25

10

mm/0.5

0.5V

or

1V/1mV

defibrillation

12

leads

protected

(Standard), x 1/4, X 1/2,

rate:

4000

samples/sec/CH

1.25

¿V/bit

standard

75

Hz

(— 3 dB)

Hz

(— 3 dB)

or

1V

EC11(1982),3.2.7.2

(— 3 dB)

or selectable

x1,

x2

Test

sequence

A,

2.

Recorder

ECG

3.

Power

Rechargeable

The

frequency Devices Standard

1982

for

Paper

Recording

waveform

Printing

requirement

AC

battery

response

by

AAMI

diagnostic

speed

width

channels

density

asource

operation

5,

10,

216 3,

4, 6 selectable

Horizontal:

Vertical: 8 dots/mm

117V

Battery

Operating Charging Charging

of

this

ECG

is

in

accordance

using

the

triangular

Electrocardiographic

25,

50

mm

40

110%,

used:

time: time: method:

waveform.

Device,

mm/sec

dots/mm

60Hz,

lead

with

1982

selectable

(25

mm/sec)

120VA acid

battery,

=

30

min.

12

hours constant protection

the

Standard

A.A.M.I.

12

in

continuous

or

more

current

circuit

for

Electrocardiographic

V,

200

1.9

mA

Ah

operation

with

overcharge

ECG8830A.SM.01

2.1

2.

SPECIFICATIONS

4.

Safety

6.

Operation

7.

Dimensions

Leakage

Withstand

condition

Operating

Operating Storage

Storage

and

Current

voltage

Temperature

Humidity

temperature

Humidity

weight

risk

class 3 (CSA Chassis: 2 100 Patient-Applied

1500V across

10 25

—

70

15

415 Approx.

AC

patient

to

40

°C

to

95

%

10

to

60

to

106

kPa

to

95

%

(W) X 420

13

rms

across

circuit

°C

(D) X 106

kg

(including

standard)

ZA

(Source)

Part: = 20

primay

and

primary

(H)

battery)

¿A

and

mm

(Source

or

chassis,

for 1 minute.

Sink)

2500 V AC

rms

2.2

ECG8830A.SM.01

1

Generdl

2

Control

3

Operation

4

PowerUnit

ооо

5

Regulators

3.

に

ににににににににににににににに

Board

ににににに

Board

.

.................. c <<.

にににににににににににに

にににににににににににににににににににににに

cc

ににににににににににににににににににににににに 3.1

600000000 o ea

THEORY

ににににににににににに

n a

OF

n a

にににに

n

OPERATION

に

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

3.2

3.12

3.13

3.18

ECG8830A.SM.01

.

3.

THEORY

OF

OPERATION

3-1

General

The

(1)

(2)

instrument

Control The

Control

Major

consists

Board

hardware Communication ECG

signal Patient Power Recorder

A/D - D/A

Pen

movement

Operation

A

4-bit

The

4-bit

Array

circuit

supply

control

converter

Board

CPU

on

the

data

controls

functions:

with

processing

isolation

for

isolation

tone

can

be

control

of

four

units.

all

of

the

operation

circuit

generator

the

key

scanning,

communicated

board.

functions

unit

by

DC-DC

LED

with

in

this

instrument.

converter

and

LCD

the

main

display.

CPU

through

the

control

|

Gate

(3)

Power

The

provides

head.

(4)

Recorder

The paper-empty

Unit

power

unit

+5

Unit

recorder

consists

V,

+24

V,

unit

consists

detection

of a battery

and

+8 V for

of

the

sensor.

The

charging

the

thermal

recorder

circuit,

control

head,

unit

AC/DC

unit

paper

driving,

is

connected

and

+24 V for

selection

motor,

to

the

control

circuit,

the

thermal

marker

board.

and

ECG8830A.SM.01

3.1

3.

THEORY

3-2

OF

OPERATION

Control

Board

The

control

movement

(1)

ECG This KV

circuit,

interface electrical

Main

1.

Input

2.

ECG

3.

Electrode QRS

>

5.

Communication

board

tone

generator,

input

section

against

includes defibrillator

an

8ch

for isolation.

functions:

circuit

waveform

detection

consists

of

and a recorder

an

input

discharge,

lead

selector, a multiplex

communicating

protection

acquisition:

check

with

the

an

ECG

protection

with

I,

II,

4000

main

CPU

input

control

input

the

section, a main

section.

circuit

capable

buffer

A/D

converter,

main

CPU

amplifiers,

V1-V6 8 channels

samples/sec/ch

via

serial

interface

and

o

CPU

of

withstanding

an

an 8 bit

the

DC-DC

(8M

baud

section, a pen

voltage

electrode

CPU, a serial

check

converter

per

second).

5

for

ECG

Acquisition

The

ECG

signals

are

amplified 8 times

from

R,

L, F (BR,

negatively

One

ladder

converter

rate

are

converted maker Electrode A/D

converted

This ECG to

the

amplifier

lead

among

(U0210)

of

250

pulse

A/D

signal

input

fed

(U0213)

usec

failure

converter

is

(U0140).

Procedure:

from

BL,

back

to

the

when

with

per

8-channels

from

check,

in

value

is

fed

back

ECG

the

patient

by

U0101,

BF)

the

RF

amplified

selected

the

R,

analog

is

each

to

averaged

channel

appears.

an

extension

through

signal

by

connecter

U0102,

signals

by

lead.

ECG

signals

by

the

L,

and F signals.

controlled

digital.

and

is

detected

type.

the

D/A

the

ladder

go

through

and

U0103.

U0104.

(I,

The

II,

multiplexer

A/D

by

U0303.

The

digital

converted

to

when

The

DC

converter

circuit

the

Lead

R,

L,

and

V1

to

(U0105)

conversion

Eight

leads

ECG

signal

1000

sample/sec

an

overflow

component

(U0220,

0205)

(U0210)

protection

I,

II

signals

and F are

V6)

is

derived

and

is

sent

is

performed

(I,

II,

undergoes

or

underflow

superimposed

to

apply

and

the

circuit

are

mixed

to

and

per

and

derived

and

by

the

A/D

at

the

V1

to

V6)

the

pace

channel.

of

the

on

the

off-set

differential

3.2

An

8-bit

the

rate

through

CPU

(U0307)

of

18

bytes/ms

the

communication

controls

and

the

detects

Gate

Array

ECG8830A.SM.01

communication

QRS

information,

(U0309).

with

the

electrode

main

CPU

failure

section

and

noise

at

ON

A

-[OJJUO)

(DVD

VET

a/v

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3.

THEORY

VD [04}U07

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OPERATION

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ECG8830A.SM.01

3.3

3.

THEORY

OF

OPERATION

(2)

Main

CPU

The

main

Gate

Array.

ECG

input

Main

functions:

1.

Various

AC

2.

ECG

3.

Control

The

control

signal.

section

CPU

section

The

control

section,

recorder

filtering:

interference

waveform

of

Gate

signal.

each

Array

The

storage

operation

main

and

consists

Gate

of

Array

control,

EMG

rejection/Hi-cut

for

copy

receives

CPU

ECG

section's

an

MC68000

(U1101)

and

operation

function

data

operations

CPU,

controls

board.

filter,

every

ROM,

the

drift

1ms

and

are

controlled

RAM,

and a control

communication

filtering

generates

by

this

with

an

interrupt interrupt

the

Control

1.

Interface e

Address

Produces

@

Interrupt Masking Produces

2.

Dynamic

256K X 4bit

3.

Keyboard

Two-way

4.

Serial

5.

A/D-D/A

An

interface

D/A

Gate

Array for

the

decoder

an

internal

control

an

IPL

RAM

control

(1M X 4)

interface

communication

interface

module

converter

with a 12-bit

general

main

CPU

and signal

interface

is

function:

(U1404)

register,

decoding

for

the

dynamic

interface

with

provided

D/A

converter.

Dip

SW,

ROM

and

interrupt

main

RAM

for

to

compose a successive

CPU

is

provided

the

ECG

signals

CPU

on

input

in

the

interface

the

control

operation

section

approximate

select

Gate

board

signals

Array.

A/D

and

3.4

6.

Dip

Interface

7.

Parallel

Interface

and

switch

to

interface

to

send

the

interface

encode

detect

power

the

OFF

ECG8830A.SM.01

Dip

switch

power

control

setting

status

signal

(AC

to

or

battery operation,

the

power

unit.

battery

voltage),

DIP

SW

I

32

MHz

128KB

PROGRAM

ROM

WAVE

RAM

3.

THEORY

OF

OPERATION

XDATA

XCLX

—>

RESET

to

OPERATION

CONTROL

GA(4)

U1101

γ

A

BOARD

<

SYSTEM

16

MHz

CLOCK

Y

“|

Main

SZ

CPU

U1404

A/D-D/A

CPU

THERMAL

HEAD

8

MHz

x

o

RECORDER

CONTROL

GA(5)

U

1602

ECG8830A.SM.01

3.5

3.

THEORY

OF

OPERATION

(3)

A/D,

It The (U1101) is and select A/D-D/A D/A

A/D

GA4 the When U0507. voltage output

D/A

converter

consists

controlled

ofa

A/D

converter,

compose a successive

by

hold

signal

converter: + 2.56V,

conversion

sets

multipelxer(U0515).

ADHOLD

MUXO

conversion

MUXO

The

comparator

from

signal

D/A

the

DAHOLD,

for

Low

goes

the

D/A

ADCMP

section

converter

D/A

is

DC

with a sample

the

sample

converter

A/D

from

GA4,

performed

12

bits

input

signals

or

High

to

High,

at

(U0506)

converter

from

the

and

hold

approximate

control

sample

and

every 2 ms.

select

the

same

compares (U0512). comparator

and

A/D

comparator

the

time

The

hold

circuit,

A/D

signals

hold

DC-IN1

the

U0507

A/D

(U0506).

multiplexer

and

Control

converter.

XLD,

SD,

signal

or

DC-IN2

multipexer

voltage

conversion

_

Gate

The

A/D-D/A

and

XSCK,

ADHOLD,

ADCMP.

analog

output

with

is

performed

and

Array

the

signal

is

held

the

reference

amplifiers.

GA4

converter

D/A

sample

channel

through

by

the

using

the

D/A

conversion

GA4

sets

(U0512).

This

signal

when

DAHOLD

through

freguency

D/A

GA4 which The DAHOLD The

(U0505A) The this The

the

conversion

sets

is

D/A

output

pen

movement

D/A

converted

volume

for

CRO

MUXO

U0512

is

component.

MUXO

to

be

converted

is

signal(PENCNT)

and

to

Low

produces

sampled

amplifier(U0510A)

for

printed

set

the

can

goes

pen

Low

to

High

filter

tone

ECG

be

adjusted

by

Low.

movement

and

out

signal

(U0505B)

output

and

is

signal(PENCNT).

signal

and

sends

the

CRO-output

the

multiplexer(U0515)

The

output

sends

to

the

is

held

is

sent

produced

by

VR0601.

signal

and

the

tone

the

D/A

converter

sampled

when

to

the

which

from

signal

averaged

DAHOLD

rhythm signal

filter(U0510B)

by

A/M

eliminates

the

lead

from

while

is

sent

to

value

(U0512).

the

multiplexer

goes

modulator

high

white

noise(NOISE)

the

Low.

data

to

rhythm

DAHOLD

CRO

which

eliminates

of

the

absolute

through

frequency

the

D/A

lead

is

High

output

(U0515)

the

component.

modulated

converter

data.

and

held

terminal

high

ECG

signal

while

amplifier

by

the

3.6

DIP

SW

8: | There

Refer

are

two

possible

to

Section

ECG8830A.SM.01

5-3-3

sensitivities

DIP

Switch

Setting.

using

DIP

switch

8.

\

from

XD

SD

XSCK

———>

DAHOLD

MUXO

\

ADCMP

ADHOLD

GA4

_

NM

D/A

U0506

NOISE

<“

NA

D/A

12

一

y

“一

i-

Mu

>

> _

>

Hiplexer

U0515

A/D,

D/A

E

oO

converter

oo oO oo

section

em

U0509A

AW

УЛ

AN

Ia

3.

THEORY

AM

|

OF

OPERATION

Modulator

A

>

|

b

oo:

RCOOUT

e

DC-IN2

<

DC-IN1

ECG8830A.SM.01

DIP

SW8

SW

3.7

3.

THEORY

OF

OPERATION

(4)

Recorder Recorder Thermal

Motor

Mark

controller control

head

controller,

and

paper-out

contains

gate

array,

detector

of

the

four

blocks:

for

motor

Xtal

18.432MHz

CPU

U1404

THERMAL

HEAD

8

MHz

SYSTEM

16

MHz

RAM

U1601

A

у

RECORDER

CONTROL

G

A(5)

U1602

Recorder Contains:

The

recorder

to

be

transferred

This

converted

control

ECG control thermal

control

ECG

into

serial

|

gate

data

converter,

frequency

head

gate

to

the

thermal

data

array

(U1602)

generator,

interface.

array

converts

head.

and

character

and

transferred

CLOCK 2 MHz

PRINT

DATA

THERMAL

CONTROLLER

MOTOR

CONTROLLER

PAPER-OUT

MARK

DETECTOR

character

I/O

the

data

to

HEAD

&

|.

№

<

font

buffer

port

for

ECG

data

delivered

the

thermal

RAM

controller,

the

recorder

from

the

main

to

the

character

head.

|

TP)

THERMAL

πα.

|

I

|

jm

|

1

| | RECORDER

unit,

CPU

into

font

MOTOR

>.

M

5

RA

UNIT

motor

and

the

data

buffer

y

is

3.8

Recorder

Control

ECG8830A.SM.01

3.

THEORY

OF

OPERATION

Thermal This temperature enable speed The capacitor's This

*

Each according darker

*When

vibrator

head

circuit

pulse

and

timing

thermister

charge

pulse

is

thermal

print.

the

stops

controller

keeps

the

by

applying

is

controlled

capacitor's

in

circuit.

also

controlled

head

to

the

paper

to

apply

print

the

thermal

heating

thermal

is

empty,

the

density

to

the

by a monostable

charge

by

head

pulse.

constant

thermal

current

head

XLACH

unit

has a unique

resistance

to

protect

>

controls

from

the

TH

against

head

multivibrator

varied.

the

to

thermal

variations

the

appropriate

the

voltage

recorder

resistance.

get

the

-

control

same

head,

in

the

enable

(U0804)

applied

gate

Dip

SW 1 should

energy

the

monostable

thermal

pulse.

with

to

the

array.

level

the

timing

and

head

The

paper

be

set

the

multi-

DIP

SW1

L

SPEED

ANALOG

SW

SPEED | U0705

. =

=

L

|

I

Head

上

777

XLATCH

XEMPTY

Control

MONOSTABLE

MULTIVIBLATOR

U0804

の

o

ENABL

ECG8830A.SM.01

3.9

3.

THEORY

OF

OPERATION

.

Motor The

motor

gate

array comparator the

speed

phase

comparator comparator included performed

To

protect

controller

speed

control

outputs

compares

sensor.

provides

in

the

APC,

by

the

pulse-wide-modulation

the

motor,

the

If

there

(motor

an

AFC

an

circuit

uses a phase-locked reference reference

is

any

phase

speed

error

to

signal

keep

is

the

overcurrent

clock

with difference

slower

to

motor

(PWM).

limiter

(MCLK)

the

or

the

motor

speed

(Max

loop

and

motor

between

faster

through

constant.

1A)

is

E

(PLL).

RUN

The

signal.

rotation

the

than

specified

the

Motor

provided.

recorder

signal

two

inputs

low-pass speed

control

The

phase

detected

of

speed),

filter

control

by the the

is

from

MCLK

RUN

GAS

APC: AFC:

r~-------------------

I

| 1 | PWM

PLL

|

! ! | CONTROLLER

に

L

Auto Auto

Phase

Controller

Frequency

人

APC

AFC

3

|

| !

|

Controller

00728

_______

R0720

2072

1

u0701A | oc

sw

A

MM

AJ

i

con

|

I | TROLLER | | 1

R—

~

U0701B

Motor

Control

|

I

! I |

00701

1

I

|

!

|

MOTOR

1

|

I

|

1

FG

1

|

FREQUENCY

|

GENERATOR

!

3.10

ECG8830A.SM.01

3.

THEORY

OF

OPERATION

Mark

Mark This using a photoreflector. output output When a mark positive

Vbe

When

Paper-out This release. The detection SW1.

and

paper-out

detection

circuit

of

circuit

paper-out

detects

is

applied

ON

or

OFF.

is

input

of

Tr

goes

high

the

space

detector

detects

When

one

condition

using a photoreflector.

detection

the

to

the

detected,

U0801

and

after

the

or

both

turns

recording

The

voltage

buffer

goes

mark

is

type

the

intensity

high

Tr

ON.

is

conditions detected

paper

which

detected,

paper-out

Magazine

marks. obtained op-amplifier

of

the

raises

take

place,

by

the

photo

It

by

linearizing

to

incoming

the

reverse

condition

the

transistor

release

m

employs a reflectance

the

photo

operate

|

output

take

and

paper-out

is

detected

Tr

light

turns

and

place.

recording

condition

state

(Q0802)

OFF

turns

OFF

paper

through by

the

PHTr1,

is

reflectance

microswitch

detector

transistor

with

the

D0801

magazine

detected.

so

一

=

7

A

LA

L

00801

PHTr1

PHT2

R0803

SW1

RO805

>.

PX

+

U0801B

00801

UN

Le

0302

<

RO806

<

OUTPUT

>

OUTPUT

RO804

ECG8830A.SM.01

3.11

3.

THEORY

OF

OPERATION

3-3

Operation

Contains Communication 1-chip When a switch return is

on

and

Board

the

operation

CPU

(U0101).

line

(SWX0-7)

driven

with

is

pressed

by

the

switches,

the

control

The

scan

and

for

that

drive

IC

LEDs,

board

line

the

scan

switch

(U0103).

LCD is

is

decoded

line

goes

The

and

via

an

(SWS0-3)

LOW,

LCD

control

8-bit

by

indicating

1-chip

two

the

decoder

for

is

controlled

way

CPU. parallel

(U0102)

that

switch

and

interface

every

goes

operation.

driven

by

U0101.

10

LOW,

The

in

LED

the

ms.

the

3.12

ECG8830A.SM.01

3.

THEORY

OF

OPERATION

AC

3-4

Power

Unit

The

power

LINE

FILTER

unit

張

consists

of

the

AC

input

section,

Power

| |

IAC14V

B

iAC18V |

1 I

I 1

i I 1

у

|

¡

i | | | | 1 I

|

—o

battery,

Boar

SWITCHING

REGULATOR

SWITCHING

IREGULATOR

+24V

+5V

and

power

board.

|

|;.,*24¥.

|

i

|

|;

FSV

[-M2%-0.5A,

|

1

|

THERMAL

551

PRINTER,

DC-DC

CONVERTOR ,

MOTOR

DIGITAL

|

CIRCUIT

CHARGE

-|

CONTROL

| 7

¡

i i

REGULATOR

+8V

SWITCHING

—|REGULATOR

-8V

Jima

BATTERY

Power

Unit

i

+8V

1

EXMA

ローーーーー

I

i

>

ANALOG

CIRCUIT

テ

ECG8830A.SM.01

3.13

3.

THEORY

OF

OPERATION

(1)

AC This

circuit.

1.

When a fuse Confirm Confirm

2.

The instrument. or

(2)

faulty

Battery The board

input

section

An

AC

that that

power

specified

transformer

When

part

protects

supplies

inlet

contains a fuse

blows:

no there

is

Use

internal

is

the

not

found.

battery

the

battery.

14

Vac

for

only

specified

parts

no

shortage

is

provided

fuse

is

LCT-1912ANK.

the

power holder, a power

CAUTION

or

boards

in

the

with a thermal

cut

off,

board

fuses

are

power

do

not

A

and

for

the

burn.

line.

replace

fuse

between

-

18

Vac

for

switch,

replacement.

and a noise

fuse

not

the

transformer

the

battery

the

to

battery

filter.

burn

if

the

and

charging

out

the

cause

the

power

(3)

Power It and V

(3-1)

Board

consists

for

Relay

AC

Capacitors then

of a relay

+24 V (Thermal

digital,

or

drive Battery

the

relay

18 V for

(C0108,

drive

circuit

operation

(RY0102)

circuit, a battery

head,

DC-DC

analog

0109)

circuit.

is

selected

are

charged

is

set

to

converter

by

the

by

Q0105

ON.

charge

on

the

relay

circuit, a relay

control

(RY0101). through

board,

To

R0107

control

and Motor),

reduce

rush

for

about 1 second

circuit,

+5

current

3.14

ECG8830A.SM.01