AMSTRAD CPC6128 User manual

PRICE:

£8.00

CONTENTS

Safety

Test

Keyboard

Exploded

View and Parts

List

CPC6128

Basic

Hardware

Analysis

Function

Diagrams

Function

Diagrams

Software

Errors

Diagnostic

Flow

Chart

Alignment

Checks

CPC6128

Main PCB

CPC6128

CPU

Circuit

Diagram

Electrical

Parts

List

GT65

Exploded

View

and

Cabinet

Parts

List

GT65

Circuit

Diagram and

Voltages

GT65 Main PCB and

Alignment

Instructions

GT65 Electrical Parts List

CTM644

Cabinet

Drawing and Electrical Parts

List

CTM644

Electrical Parts List and Alignment Instructions

CTM644

Electrical Parts

List

and

Voltages

CTM644

Circuit

Diagram

Main PCB

Interface

Circuit

Diagram

Disc

Control

Circuit

Diagram

Cassette

Control

Circuit

Diagram

Mechanism

and

Mechanical

Replacements

Technical

Specification

Page

2

3

4

5

6

7

8,9,10,11

12,13,14,15

16,17,18

19,20

21

22

23

24

25

26

27

28

29,30

31,32

33,34

35,36

36

37

Back

page

2

SAFETY

TEST

All

Monitors

are

safety

tested

to

the

following

specifications.

1).

Flash

Test

at

3kV

between

the

live

and

neutral

of

the

mains

lead

joined

together

and

ALL

accessible

metal

points

on

the

exterior

of

the

set.

2).

Insulation

Resistance

Test

between

the

live

and

neutral

of

the

mains

lead

joined

together

and

ALL

accessible

metal

points

on

the

exterior

of

the

set

to

show

a

resistance

of

at

least

4Mohm.

If

after

servicing

there

is any

doubt

about

continued

electrical

safety

the

above

tests

should

be

carried

out.

AMSTRAD

CONSUMER

ELECTRONICS

PLC

BRENTWOOD

HOUSE,

169

KINGS

ROAD,

BRENTWOOD,

ESSEX

CM14

4EF.

Telephone:

Brentwood

(0277)

228888.

Telex:

995417

AMSELE

G.

2

1

4

KEYBOARD

EXPLODED

VIEW

KEYBOARD

PARTS

LIST

Sym

Description

1

Cabinet

Top

Assembly

2

Frame

FDD

3

Knob

Volume

4

Cabinet

Bottom

5

Keyboard

Assembly

ESU-244

6

Compact

Floppy

Disc

Drive

EME-155

7

Volume

Rotary

K121

LOlOT-20KB

8

Jack

RCA 3.5

HSJ1061-01-440

9UserPort

Socket

HXC0730-0

1-0

10

Jack

DIN

TCS4450-01-101

11

Jack

DC

HEC0470-01-630

12

Jack

DIN

TCS4460-01-1011

13

Cord

DC

14550401

14

Relay

G4S-1112P-1-B-19

15

Cord

Connector

8W6Q004A

16

SpeakerC040K01K2451

Part No.

170855

170856

170806

170857

170858

190005

170807

170022

170023

170850

170024

170025

170822

170123

170862

170124

CPC61

28

-BASIC

HARDWARE

ANALYSIS

RED

NO

LED LIGHTS >----1_--<

?

MAINS

FUSE

OK

?

NO

REPLACE

MAINS

FUSE

YES

{

CHECK FAULTY MONITOR

•CABLE TERMINATION

ALL OK •INTERNAL CONNECTORS

•BRIGHTNESS CONTROL

NOTHING{FAULTY

ULA

Z80A

6845

CRYSTAL

RAM

FAULTY VIDEO

CONNECTOR

FAULTY CABLE ASSY

FAULTY

ULA

>------<

FAULTY

PCB

STILL

NO

ANY

PICTURE

AT

ALL

?

{

FAULTY

LED

1----

BROKEN

PCB

TRACK

FAULTY

CONNECTER

YES

5V

NO

CHECK

FOR

DC

PRESENT

>-------l FAULTY CABLE

ON

OR

PLUG

ASSY

CABLE

FROM

MONITO

NO

RGB

VIDEO

YES

CONNECTOR

>---<

INSERTED

TEST SWITCH {

ON COMPUTER

1---_

FAULTY

SWITCH

KEYBOARD

UNIT

CHECK

INTERNAL

CONNECTORS,

SOLDERED

JOINTS

CHECK

KEYBOARD

CONNECTOR

FAULTY AUDIO

AMP

OR

SPEAKER

FAULTY VOLUME CONTROL

FAULTY AUDIO CONNECTOR

PLUG/SOCKET

FAULTY

AY-3-8192

SOUND IC

YES

NO

IF

UNIT STILL

FAULTLY

SEEK

SPECIALIST

ADVICE

NO

YES

DOES

SOUND

OPERATE

?

DO

__

I-

N_

O

<ALL

KEYS

OPERATE

?

NO IMPROVEMENT

SEE DISC

FLOW CHARi

CHECK

KEYBOARD

PCB

FOR

SIGNS

OF

ABUSE:

-CRACKS

-LIQUID SPILLAGE

-DISTORTED MOUNTING

CHECK CONNECTOR LEAD

AND TERMINATION

REPLACE}

DISC

Full

diagnostic

tests

on

the

C.P.U.

can

be

carried

out

using

the

Amstrad

RP2

Test

Pack.

Please

contact

Amstrad

PLC

for

information

on same.

4

ICI/4

I 2

OUTPUT

IQ

CONROL

FUNCTION

DIAGRAMS

ICIOI

ICI06

5

CPC6128

FUNCTION

DIAGRAMS

FUNCTION

FOR

A

I1ICROCOI1PUTER

AND

IC's

ICI08 ICI07

IC

1/1

ADRESS

BUS

-A2

I-AI

o

-Ao

-GND

8-RFSH)SYSTEI1

7-11]

CONTROL

6 -

RESET~to~TROL

-DUSRO

CPU

-

BUS

4 -

WA

IT

CONTROL

3-BUSAK

2-lJRjSYSTEI1

I

-IW

CONTROL

L-

........J

ADRESS

BUS

Vo

PORTA

WRITE

CONTROL

3

-RESET

INPUTS

o

I1AI

I1A2

I1A3

Vee

---.....

__

----r-

KEYBOARD

SW,

CONNCTOR

NO.

234

568

10

~PD

765A

VCC

RWISEEK

lCT/DIR

FR/STP

HDl

ROY

WP/TS

FlT/TRC

PSo

PS1

WDA

USo

US1

HD

MFM

WE

VCO

RD

ROW

l..... ---.,....::.:r

WCK

RESET

R5

ViR

CS

AO

DBO

DB1

DB2

DB3

DB4

DB5

DB6

DB]

ORO

DACK

TC

lOX

INT

ClK

GND

q

5

4

7

6

3

II

12

II

DEL

!1/

II

"

ESC

Q

TAB

A

APc,

Z

12

LOCK

11$

If

1+

II

If

IJ

If

1/

IJ

43EWSDCX

11&

1/,;,

IJ

1/

II If

I

65R T GFBV

lie

II

I

II

If

II II

1/

I

8 7 UYHJN

SPACE

KEY

1/

1/)

If

II

If

II If

11<

I

-

If;

9aILKM•

Ifi-

11=

1/ I

If

1/+

IJ;(

II?

I

>

t-IP

;.-

@.

1/

II

If

1/

II

1/ I

CLR [

ENTE

]4

ISH~~

"

CTRL

-R

f

If

'f

1/

II

If

I

.-

COPE

78512

If;

II

If

II

1/

If

1/

I

t

--.

+963

ENTE

.

-R

ICI02

ANALOG

CHANNEL

C

TEST

I 2

Vee

ANALOG

CHANNEL

B

ANALOG

CHANNAL

A

Vss

lOA?

lOA.

IOAs

IOA4

IOA3

IOA2

lOA

I

lOAD

6

Software

Errors

If

a

drive

fault

is

reported

the

fault

may

be a

software

problem.

Before

investigating

the

drive

please

carry

out

the

following

checks

to

ensure

it is

not

a

software

problem.

Detection

and

Correction

of

"Soft

Errors"

Soft

errors

are

usually

caused

by

the

following

reasons.

1)

Random

external

noise

of

several

usec

or

less.

2)

Minute

off-tracking

and

shifting

of

write

timing

that

are

not

detected

during

the

write

operation

which

can

cause

the

soft

error

during

the

read.

To

remedy

such

soft

errors,

take

the

following

procedures

at

the

controller

side.

1)

Repetitive

reading

on

the

track

by

10

times

or

more

until

the

data

is restored.

2)

When

the

data

is

not

restored

by

step

1,

access

the

head

to

the

adjacent

track

in

the

same

direction

as

move

previously, and

thereafter

return

the

head

to

the

original

track.

3)

Repeat

the

step

1.

4)

If

the

data

is

not

restored

by

the

above

steps,

the

error

cannot

be

remedied

Write

Error

When

an

error

is

caused

during

the

write

operation,

the

error

is

usually

detected

during

the

through

the

read

operation

called

"Write

check".

To

correct

the

error,

repeat

the

write

operation

again and

carry

out

the

Write

check.

If

the

result

is still

incorrect

even

after

the

write

operation

is

repeated

more

than

10

times,

either

the

disc

or

the

drive

are

working

incorrectly.

To

find

out

the

trouble

source,

carry

out

the

read

operations

with

another

track.

Should

the

error

still be found,

change

the

disk

and

repeat

the

above

procedures.

Should

error

still

be

found,

the

drive

should

be

considered

defective.

If

the

8rror

is

removed,

the

original

disk

must

be

defective.

Discard it.

Seek

Error

1)

Step

motor

or

step

motor

drive

circu

it is

defective.

2)

The

torque

of

the

carriage

is

not

correct.

Restoration

procedures

from

the

seek

error.

Make

the

re-calibration

to

the

track

00.

Then,

carry

out

the

re-seek

to

the

original

track.

Notes:

1)

Always

ensure

the

head is clean.

2)

Index/Sector

Factor

(Ready

Defect)

As

the

unit

has

Optional

Read

Output

It

is

normally

not

ready

until 2

revolutions

are

made

after

the

disk

insertion.

7

3-A

Diagnostic

Flow

Chart

This

chart

must

be

used

in

conjunction

with

the

Alignment

Procedures.

This

chart

is

for

information

only

and

does

not

guarantee

an

exact

diagnosis.

For

warranty

purposes

any

faulty

drive

mechanism

must

be

returned

toAmstrad

for

replacement.

Service

Agents

should

not

attempt

anyrepairs on

the

mechanism

or

to

its

p.e.B.

P.No.

30001.

N

Motor

rotation

NRead

error

N

Write

error

N

Interchange-

ability

error

8

Disk

Drive O.K.

3-8

Motor

rotation

y

FLOW

CHART

(cont)

N

Check

wiring

Adjust

to

200±1

ms

N

y

Replace

motor

Replace

drive

9

3-C

Read

error

Test

with

disk

EME -CF2

y

N

FLOW

CHART

(cont)

y

Replace

drive

10

Replace

disk

(inspect

by

drive)

Replace

drive

N

Replace

drive

N

Replace

head

assembly

Replace

drive

Replace

TROO

sensor

3-D

Open

Repair

head

connector

FLOW

CHART

(CaNT)

Write

error

Short

Replace

control

PCB

Amplifier

system

Head

system

Replace

drive

Media

failure

N

Adjust

positioning

N

Adjust

index

timing

11

The

data

contained

in

the

following

4

pages

is

for

information

only.

Service

Agents

must

not

carry

out

any

repair

or

adjustment

to

the

Drive

mechanism

and

its

associated

PCB

30001

during

warranty.

Fauity

mechanism

must

be

returned

to

AMSTRAD

for

exchange.

Alignment

Checks

Please

use

this

information

in

conjunction

with

the

diagnostic

flow

chart.

Equipment

required:

Double

Beam

Scope;

EME

-CF2 Test

Disk

(please

refer

to

disk

notes

for

usage).

The

following

checks

can

be

carried

out

in

routine

servicing. If

the

wave

patterns

do

not

appear

this

confirms

a

fault

with

the

mechanism.

Before

attempting

any

replacement

check

these

waveforms

thoroughly.

Content

of

adjustment

and

checking

CE

DISK

EME CF2

1.

Rc:dial

adjustment

by

use

of

Track

19

(Fig.

1).

0

2.

Adjustment

of

the

index

burst

by

use

of

Track

39

(Fig.

2).

0

3.

Azimuth

check

by

use

of

Track

39

(Fig. 3-4). 0

List

of

Test

Points

Test

point

Name

of

signal

TP 1Read

signal

of

filter

outlet

TP 2Read

signal

of

filter

outlet

TP 3

Signal

ground

TP 5TROO

sensor

output

TP 9

Index

signal

TP

11

Signal

ground

2ms 2ms

....

'U.5

BLOCK

2

BLOCK

3

BLOCK

49

iiiiII

ms

,....

-

,....

2F

1F 1F

"

.....

~

....

-

....

~

i4-500fJs

........

....

--

300fJs

500fJs

200ms

(TOTAL

49

BLOCKS)

12

INDEX

Fig.1

Waveform

of

T19

(Servp

pattern)

INDEX

ALIGNMENT

CHECKS

.....-

,.....

-

500fJsec

Fig.

5-1

Index

burst

waveform

Amplitude

ratio (%)

100

80

60

40

20

~

~-

~

--

~

~~

~

JI

__

Ibl

lajI-IE}

Inner:

bla

x100%

Outer:

alb

x100%

10

20

30

40

50

Amount of

Off

-center

(I-'

)

Fig. 5-2

Off-centre

calibration

curve

(Effective

width

of

read

head

is

180u)

Fig.

5-3

Azimuth

burst

-48'

-72< +48' n+72'

-

12HH

OB-

0-8·&88-

+

12

-BG-HB-

Fig, 5-4

shows

azimuth

burst

in

the

cases

of

azimuth

-12',0'

and

+12.

13

ALIGNMENT

CHECKS

(cant)

Fig. 2Waveform of

T39

(Index pattern -Radial alignment)

Difference

between

Track

00

and

39

is

within

18fJs

(2')

300fJs

+114-

2F

(l25kHz)

INDEX

I

.

500fJs

-

1.8ms 0.6ms

~500fJs

r-01ms

100%

2F(125kHz)

INDEX

I.B

234

Fig.3

Waveform

of

T39

(Azimuth,

alignment)

120

o5 3 5 0 5 3 5 0.5

, I

BLOCK

47

I I I

....J

I I

BLOCK

1

BLOCK

2

BLOCK

3

47

pair

servo-patters

for

posi~ioning

use

Fig.4

Waveform

of

T39

+72 -48'

+48'-72'

U

IL...-

--J

Index

Aximuth

burst

2F

1F

II

Track

~

it

,enre'

it

.ij}

r-

--

r-

921J

t90

IJ

I

-I

I

_.

-I-

-

--

-

-r--

OJ.

'O.~

I

~I

L-

0.5 0.5 0.5 0.5

L-

3sJL

2.0

10.0

3.5

0.5

O.

0.5

14

ALIGNMENT

CHECKS

(cant)

1)

Check

Positioning

1)

Load

CE Disk.

2)

Set

up

track

00,

Motor

off.

3)

Scope

to

TP5.

4)

Adjust

00

Sensor

(8 on Fig. 6)

so

that

scope

shows

correct

difference

as Fig.

2.

2)

Adjustment

of

Index

Timing

1)

Load

the

CE

Disk

(refer

to

disk

info)

2)

Step

the

disk

to

the

track

39.

3)

Synchronise

the

oscilloscope

by

TP9

(INDEX).

Set

the

time

base

to

0.1

msec/DIV.

4)

Connect

the

probe

to

TP1.

Connect

the

ground

probe

to

TP3

and

TP11 (ground) of PCB.

Set

the

input

to

AC

and

set

the

vertical

axis

to

20mV/DIV.

5)

Measure

timing

between

sweep

start

and

an

initial

data

pulse. It

should

be

500

usee

±500

usee.

When

the

timing

is

not

within

this

range,

proceed

with

the

following

adjustment.

(Refer

to

Fig. 5-1).

6)

Loosen

the

tW'1

screws

fixed

LED

printed

board.

Adjust

the

position

of

LED

printed

board

so

that

the

timing

is

500

usee

±

100

usee.

7)

Re-check

the

timing.

8)

Seek

to

the

track

00

and

make

sure

that

the

timing

is

within

500

usee

±

200

usee.

Tighten

the

screws.

(Fig. 5 -

1).

3)

Check

of

Head

Output

This

check

is

effective

only

when

making

write

and

read

check

as

described

below. If

the

output

level is

less

than

the

prescribed

output,

clean

the

head

before

check.

Disk

used

for

this

check

must

be

in

good

condition.

1)

Load

the

CE Disk.

2)

Select

track

39.

3)

Connect

one

of

the

probes

of

the

oscilloscope

to

TP1

of

the

printed

circuit

board,

another

probe

to

TP2,

and

the

probe

to

ground

to

TP3, TP11 (ground).

Invert

one

channel,

and

set

it

to

Add input,

set

input

to

AC,

and

set

the

vertical

axis

to

50mV/DIV

and

the

horizontal

axis

to

20msec/DIV.

4)

Make

sure

tha

average

output

level is

the

following

value

or

more:

140

mV p-p (SN

25dB

or

more)

If

the

output

is

less

than

the

above-described

value,

replace

the

head.

4)

Adjustment

of

Positioning

1)

Load

CE disk.

2)

Select

Track

19.

3)

Monitor

the

output

in

the

same

way

as

the

head

output

inspection.

Calculate

the

off-track

amount

in

reference

to

the

calibration

graph,

showing

the

interrelation

between

the

burst

amplitude

ratio

and

off-track

amount.

(Refer

to

Fig. 5-2).

4)

The

average

of

amplitude

ratio

should

be

below

26

um.

If it is

not

within

this

range,

make

the

following

adjustment.

i)

Loosen

the

bolt

of

the

rotation

stopper

which

fixes

the

screw

shaft

(Fig. 6-3).

Rotate

the

screw

shaft

and

adjust

it in

such

a

way

that

the

amplitude

ratio

may

become

below

15

uM.

Tentatively

set

the

bolt

at

that

position.

ii)

Make

the

to

track

step

to

the

inner

and

outer

circles

and

bring

it

to

the

original

position.

Make

sure

that

the

adjustment

is all right. Then,

tighten

the

bolt.

5)

Confirmation

of

Head

Azimuth

1)

Load

the

CE

Disk

2)

Select

Track

39.

3)

Synchronise

the

probe

of

the

oscilloscope

byTP9 of PCB

and

connect

another

probe

to

TP1,

and

the

probe

ground

to

TP3, TP11 (ground).

Set

the

input

to

AC,

the

vertical

axis

to

10

mV/DIV,

and

the

horizontal

axis

to

0.5

msec/DIV.

Make

sure

that

the

two

outside

burst

waveforms

are

smaller

than

two

inside

burst

waveforms

as

shown

in Fig. 5-3.

Note:

Signal

preceding

the

azimuth

burst

is

the

index

burst.

If

the

azimuth

is

still

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20

ELECTRICAL

PARTS

LIST

Circ. Ref.

Description

Part No.

Carbon

Film

Resistors

470hm

R146-153,

161,

162

10020

560hm

R155,306

10022

820hm

R141

10030

1500hm

R136

10036

1800hm

R134

10037

2200hm

R137

10040

2700hm

R126,

128,

130

10042

5600hm

R317

10050

6800hm

R1

25,

127,

129,

135,

157, 158,

10052

301

1

kohm

R113,

121-123,

132,

140,211,

10061

212,216,313,315,321

1

k50hm

R124

10065

2k2ohm

R102,

109,

110,

112,214

10069

3k30hm

R131

10073

4k7ohm

R144,

310,323

10077

10kohm

R114-117,

120, 133,

142,217,

10085

309,312

18kohm

R308,311

10091

22kohm

R118,119,304,305

10093

47kohm

R302,

303,

307,

319,

320

10101

470kohm

R314

1

Mohm

R111

10147

3M30hm

R101

170867

10Mohm

R143,145

170868

4ohm7

V4W

Fuse

R322

170866

100ohm1f2W

R316

1400183

Ceramic

Capacitors

15pF

C137,138

170869

220pF

C139-141,310

400107

270pF

C313

170126

470pF

C306

24004

0.1

uF

C101-135,201-213

24020

Electrolytic

Capacitors

1

uF/50V

C309,311,314,317,318

20062

22uF/10V

C308

20025

47uF/10V

C136,

303,

306

1400244

100uF/10V

C301,304

20028

100uF/16V

C315

20028

Polycarbonate

Capacitors

(All

working

voltage

50V

D.C.)

0.001 uF

C312

170217

0.01

uF

C305

170128

0.047uF

C318

1409178

0.068uF

C302

170129

0.1

uF

C319

320

170851

Diodes

D1

01,303,304

1S2472-HS

170115

D201

DS442XFA5

170816

D301 10E1

170865

D302

SLP-155B

(R)

170866

Circ. Ref.

Description

Part No.

IC's

IC101

HD74LS145

170101

IC102

AY-3-8912

40001

IC103

TMM-23256P-1953

40025

IC104,

105,

109,

HD74LS153

170103

113

IC106

HD74LS273

170104

IC107

M5L8255AP-5

170105

IC108

HD6845SP

170106

IC110,210

HD74LS132

170107

IC111

Z8400APS

40080

IC112,207

HD74LS32

40013

IC114

HD74LS373

170108

IC115

HD74LS244

170109

IC116

HSG3130/3170

40010

IC117

TC74HCU04P

40008/A

IC11 ePAL

16L8AC

40031

IC119-134

MSM3764-20RS

170110

IC201

UPD765AC-2

40018

IC202

FDC9216BT

170812

IC203

SN74HC240N

170863

IC204

TMM-23128P-1851

40015

IC205

DN74LS08

40011

IC206,208

DN74LS38

40019

IC209

DN74LS136

40016

IC211

DN74LS27

40012

IC212

DN74LS74

40014

IC213

TC74HC161

P

170864

IC301

LA4140

170111

IC302

LA6358S

170814

Tra

nsistors

Q101

/2SC2120Y

170113

Q1

02,301,302

2SC1815Y

170114

W303

2SC950Y

170448

Miscellaneous

J101

Jack

DIN

170025

J102

Socket

D

Sub

9

170023

J103

Jack

RCA3.5

170022

J104,

105

Socket

IC

20

DIL

170021

J106

Socket

IC

10

DIL

170865

J301

Jack

DC.

170024

J302

Jack

DIN

170850

VR301 Vol. Rot.

20k

170807

CD302

D.C.

Cord

170882

CD201

Cord

Connector

170862

FDD201

Compact

Floppy

Disc

190005

Drive

EME-155

NR101

R.

Network

Exb

P86222J

170860

NR201

R.

Network

Exb

P87681

J

170861

RY301

Relay

G4S-1112P-1-B-19

170123

SP301

Speaker

C040K01

K2451

170124

X101

Crystal

HC-18RW

16MHz

170859

No

part

numbers

are

given

for

any

parts

on

PCB30001,

should

there

be

any

electrical

fault

with

that

PCB

Service

Agents

should

return

the

whole

Disc

Drive

Mechanism

complete

with

the

PCB

for

replacement.

21

GT65

CABINET

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7

GT65

CABINET

PARTS

LIST

Sym

Description

Part

No.

1

Front

Cabinet

170831

2

Cable

Clamp

170502

3

Bracket

Cabinet

(L)

170504

4

Bracket

Cabinet

(R)

170503

5

Bracket

P.C.B. (L)

170505

6

Bracket

P.C.B.

(R)

170506

7C.R.T.

Green

170507

8

Metal

Washer

C.R.T.

170508

9Fixing

Screw

C.RT

170509

10

Deflection

Yoke

170510

11

C.RT

Socket

170511

12

Power

Tx.

S/170832

13

Rear

Cabinet

170513

14

Control

Knobs

170514

15

Button

Power

170515

16

On/Off

Switch

170516

17

V.

Hold

Pot.

170833

18

Contrast

Pot.

170518

19

Brightness

Pot.

170519

20

D.C.

Cord

170316

21

DIN

Cord

170317

22

D.C.

Jack

170834

23

u

Metal

Shield

170512/SH

22

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