Amstrad PC1512 PC MM CM Service Manual

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I
PC1512
PERSONAL COMPUTER

PC-MM
MONOCHROME MONITOR

PC-CM
COLOUR MONITOR
SERVICE MANUAL

CONTENTS

Page

Safety Note
Technical Specification
Servicing Note
FD-3 Flow Chart
FD-3 Flow Chart
FD-3 Servicing Information
List

Electrical Parts List

CPU

Memory expandable on motherboard

16& 17
18-20
21

Assembly Component Side
Exploded View CPU Unit
P.C.B.

Hard Disc Installation Instructions
Alignment Instructions PC-CM
Alignment Instructions PC-MM/PC1512
Cabinet Diagram & Parts List PC-CM
Cabinet Diagram & Parts List PC-MM
Chassis Schematic Diagram
Keyboard Schematic Diagram & P.C.B. Layout
Keyboard Exploded View
Chassis Schematic Diagram PC-MM
Chassis Schematic Diagram
Chassis Schematic Diagram
Chassis Schematic Diagram PC-MM Monitor
Chassis Schematic Diagram
PC-CM Power Supply
PC-CM Main PCB Component Layout
PC-CM Main PCB Component Layout
CRT PC Board, Colour Monitor
Schematic Diagram FD-3 CPU

22

unit with all circuitry on a single motherboard.
processor.

8MHz 8086

3
3

7- 14
15

Cabinet Diagram Exploded View

2K system

51

2

4-6

FD-3 Exploded View
Cabinet Diagram Exploded View & Parts

TECHNICAL SPECIFICATION

2

&23
24
25
26
27
28
29

30-33

34&35
36
37
38
39
40
41

42
43
43
44

to 640K.
Integral colour graphics adaptor with special 16 colour hi-res

mode.
Three full-size compatible expansion slots with power available
in the standard unit to supply a hard disc and controller.
Choice of one or two 360K 5 A" floppy discs or one floppy with a
1

1

or

20 megabyte hard disc

drive.

HARD DISC VERSIONS ARE SUPPLIED WITH AN EXTRA
FLOPPY DISC AND MANUAL WITH BACKUP, RESTORE AND
FORMAT UTILITIES.
Motherboard includes an RS232c serial and parallel interface
with standard connectors.
Loudspeaker with volume control.
Battery-backed real time clock and configuratioon RAM.
Socket for 8087 maths co-processor.
Connector for light pen.

Complete with Colour Monitor

or

Monochrome (Grey

Level)

Monitor.

The standard
modes.

built-in

colour adaptor provides

all

the following

resolution Alpha; 16 colours, 40x45 characters.
High resolution Alpha; 16 colours, 80x25 characters.
.^
2 colour, Three 4-colour pallettes,

Medium

Medium resolution Graphics;
320x200 pixels.

High resolution Graphics; 2 colour, 640x200 pixels.
-FSpecial high-res Graphics; 16 colours, 640x200 pixels.
Full size

QWERTY

keyboard.

Illuminated Numlock and Capslock.
Keyboard joystock port.
Extra DEL-» and ENTER keys.

Two

button

Mouse

with

Dedicated port on system unit.
Microsoft compatible MOUSE.COM plus special text operation.

DIMENSIONS (all in mm)
PC1 51 2SD System unit 372(w) x 384(d) x
PC1512DD System unit 372(w) x 384(d) x

PC-MM
PC-CM

35(h) 6.05Kg
135(h) 7.75Kg

1

465(w) x 1 60(d) x 58(h) 1 .1 75Kg
Monochrome Monitor 350(w) x 300(d) x 31 5(h) 7.43Kg
Colour Monitor 372(w) x 365(d) x 330(h) 1 1.6Kg

Keyboard Unit

inc feet

SAFETY TEST
All

monitors are safety tested to the following specifications.

1). Flash Test
Test at 3kV between the live and neutral of the mains lead joined together and
and ALL accessible metal points on the exterior of the set.

2). Insulation Resistance Test
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
tests should be carried out.

doubt about continued

AMSTRAD

BRENTWOOD HOUSE,

electrical safety the

above

pic

169 KINGS ROAD, BRENTWOOD, ESSEX CM14
TELEPHONE; 0277 230222. TELEX: 995417 AMSELE G.

4EF.

NOTE
THE FLOWCHARTS ARE FOR INFORMATION ONLY AND FOR WARRANTY PURPOSES ANY FAULTY
DRIVE MECHANISM MUST BE RETURNED TO AMSTRAD FOR REPLACEMENT. SERVICE AGENTS
SHOULD NOT ATTEMPT TO REPAIR THE MECHANISM.
SERVICE AGENTS SHOULD NOTE THAT THE HARD DISC UNITS ARE THE MOST SOPHISTICATED
MECHANISMS AND SHOULD NEVER BE OPENED IN A NORMAL ENVIRONMENT. IF ANY ATTEMPTS
ARE MADE TO OPEN THE HARD DISC UNITTHE GUARANTEE IS THEN INVALIDATED AND AMSTRAD
TAKES NO RESPONSIBILITY TO EXCHANGE THE DRIVE.
YOU SHOULD NOTE FURTHER THAT THERE ARE TWO TYPES OF HARD DISC UNITS IN USE
i.e. XEBEC AND TANDON. WHEN ORDERING THE REPLACEMENT UNITS MAKE SURE THAT THE
PART NO. IS EITHER 171663/X FOR XEBEC DRIVE OR 171663/T FOR TANDON DRIVE. THIS
INFORMATION APPLIES ONLY TO THE 20MB DRIVES.
AMSTRAD RESERVES THE RIGHT TO AMMEND THE CIRCUIT OR CHANGE THE COMPONENTS
WITHOUT PRIOR WARNING.
USE RP4 DIAGNOSTICS EXPANSION CARD OR DIAGNOSTIC DISC FOR FAULT FINDINGS.

FD-3 SERVICE

1.

Introduction

This section
1-1

INFORMATION

is

for the

maintenance

of

DFC222A.

General

The floppy disk drive is a high precision equipment and requires the following jigs, tools, measuring
instruments, and adjustments when repairing or changing parts.
2.

2-1

Special Jigs, Tools and Measuring Instruments
List of

CE

Special Jigs and Tools

diskette

Blank diskette
Test pin connector
Alignment adjusting

O
2-2

track adjusting

List of

jig

jig

Measuring Instruments

Oscilloscope
Brikon
Frequency counter
2-3

CE

Diskette (Alignment Diskette)

This diskette

is

used

for the following

(2)

R/W head radial position
R/W head azimuth

(3)

Index position

(1)

adjustments and inspection.

Trouble

3£
See

error
of

command

FDC.

NO

YES

->-

Nn

YES

->-

Change LED

See

this maintenance
maunal to other
mechanical troubles.

Cannot
write

V
Is write protect
signal received?

YES\/

NO
Medium may be
damaged.

•-YES

—

Does write
medium is changed?
it

Is write
protect seal stuck

if

on medium?

Is

Y

Y

NO

YES
Remove

head cord damaged

seal

or disconnected?

YES

V
Exchange head

NO

Is write gate
correctly opened?

NO

Check

circuit

check system

YES

_L_
Is

setting

appropriate?

YES
Check

circuit

NO

Drive NG
(stepping motor)

NO

Write protect sensor has

Check write
protect circuit and
periphery.

failed.

its

J

±
Is

termination

NO

Mount
correctly

resistor correctly

attached?

YES

YES

1_
Is

environment

NO

condition appropriate?

Set up environmental
condition appropriately

Is

spindle

YES

YES
Are errors
after changing
another medium?

NO

Medium may
be

caused
to

NO

speed OK?

faulty

Is

index

NO

Adjustment

signal correctly sent?

YES
a very
large noise source
present?
Is

YES

Remove

noise

source

NO

YES

Is tlkere

NO

&
Is

\l/

there

sufficient

NO

Change head

head

azimuth
azimuth

Is

NO

Tilting of

due

heads

YES

YES
Are errors

guide shafts

to shock, or

are defective

head pressure

NO

Is

caused on inner
circumference of

seek

NO

operation

>

Check step motor and
driving mechanism

normal?

tracks?

YES

YES

A
Is

time margin
circumference

NO

Is

power

correctly fed?

of inner

tracks sufficient?

^L

YES

Change the
circuit board.

YES

printed

Change

the head if problem
is not solved.

v

^_
Check data separator

Check

on system side

(Read errors are caused)

circuit

NO

Check power
ripple noise

FD-3

FLOWCHART

Are connectors

NO

..

NO

^

Plug correctly

correctly plugged?

YES

r>

Medium may

short bar

Is

setting correctly?

be faulty

>

Set normally

YES
YES

NO

medium

Is

rotating?

YES
sk_

J1L.

Does cariage
operate properly?

Does read
changed to
it

if

NO.

another medium?

XL

Check step motor
and circuit head
mechanism

Is

power fed?

NO

Check power

driving

operating step
motor.

YES

YES

NO

A
Is

alignment

NO-

OK?

Does read
waveform show
after

YES

Adjustment,

Does DC motor

alignment

(Apply 12V)

3l
Is

NO

spindle

Change DC motor

*

YES

NO

YES

NO^

operate?

adjustment?

Read

J/

Are cords
and wires correctly

has
a problem.

speed OK?

circuit

NO^

Correct
incorrect wiring.

connected?

Exchange

V

MC3470AP.
Change printer
circuit board.

YES

Over-

YES

NO

speeding?

1_

XL.

Is index signal
sent correctly?

NOi

YES

V

Operating
normally?

Check motor

YES

-

YES
I

OK

Is

motor

ON

signal sent?

head cord
trouble.

servo cord
disconnected
from motor?

*_

XL.

TRKOO OK?

NO

Possibility of circuit
part faults. Adjust

V
YES
Is

motor

Is

index sent?

V

start

centering motor-control
printed circuit board.

-NO

Adjust

YES

time appropriate?

NO

XIndex sensor
is

faulty

YES
Read

circuit

Adjust

V
may

have problems.

Change MC3470AP.
Change printed

signal on
system side

Check

YES

Possibility of

or

control printed
circuit board. Is

Is

NO.

V

Adjust

V

circuit board.

Can

it be
adjusted?

V
NO
Change motor

Drive has problem

(Medium

slip or

other reason).

-YES- OK

W

3.

Diagnosis Procedure

3-1

General
Errors caused by an incorrect operating procedure, erroneous programming, damaged diskette,
sott errors caused by dirty air, random electric noise, and other external factors are often
considered to be drive failures or incorrect adjustments. Check that errors are repetitively
produced with the first diskette and that similar errors are also produced with other diskettes,
unless obvious assembly trouble and damage are found in visual inspection.

and

3-2

Soft Error Detection

and Correction

caused by the following.
between the R/W head and disk. Normally, this dirt

Soft errors are generally
(1) Dirty air
(2)

Random

electrical noise less than several

is

cleaned by the

liner in

the diskette.

microseconds.

Delicate track misalignment and writing timing misalignment that are not detected during
writing may cause soft errors during reading.
(3)

(4) Improper ground of the drive or host system power supply.
(5) Improper motor speed.
The following actions are required on the control side to recover the foregoing soft
(1) Reread the track ten times or until data recovers.
(2) Access the head to an adjacent track in the same direction as the track
the
recovered by Step 1. Then return the head to the previous track.
(3) Repeat Step 1.
if

(4)

3-3

errors.

error

is

not

Errors that cannot be recovered after taking these steps cannot be recovered.

Write Error

Operate READ-AFTER-WRITE if an error occurs during the write operation.
If the
error cannot be recovered after operating READ-AFTER-WRITE more than four times,
operate READ-AFTER-WRITE on another track to determine whether the diskette or drive is
responsible for the error. Change the diskette and repeat these steps if the same error remains. If
the error still remains, the drive has some fault and if the error is erased, the diskette is defective
and should be discarded.
3-4

Read
Most

errors are soft errors. Data can be recovered by following the error recovery steps (3-2).

3-5

Seek

Error

(1)

Trouble with the stepping motor or stepping motor drive

(2)

Carriage trouble.

Seek

3-6

Error

error

is

recovered by system

(1)

Recalibrate

(2)

Detect ID

soft.

circuit.

There are two recovering ways.

field

Compatibility Error

some

cases, data written by one drive cannot be read by another drive. This
following reasons:
In

The check points are
(1)
(2)
(3)
(4)

3-7

listed

Improper head alignment — 5-2
The head output is low — 5-6
Motor speed irregularity — 5-1
Check if the recommended sector format

List of

is

below.

is

set up.

Test Points (see figure 3-7)

Name

Test Point

Signal

TP1

AMP OUT +
AMP OUTGND

TP2
TP3
TP4
TP5
TP6
TP7
TP8
TP9

3
Fig.

3-7 Test Point Layout

STEP
READ DATA
INDEX
WRITE PROTECT

TRACK

GND

dur mainly to the

Exchange

4.

Parts

4-1

Printed Circuit Board

Exchange (See Figure

4-1)

Board Removal

4-1-1 Printed Circuit

and cord holder

a)

Expand the two shield board pins

b)

Unfasten the three fix screws and remove the shield board.
Disconnect the connectors (head, stepping motor, spindle motor, track sensor, index sensor, and

c)

pin.

write protect sensor).
d)
e)
f)

three printed circuit board

Unfasten the

Moves
Lift

'.he

head

to inner about

fix

screws.

10mm.

the rear edge of the printed circuit board and

pull

it

back.

4-1-2 Printed Circuit Board Mounting and Adjustment

the printed circuit board as if to lower the front edge, insert the front
insertion hole on the front plate, then lower the rear edge.

a) Tilt

b) Fix
c)

LED

into the

LED

three screws.

the printed circuit board with

Secure the shield board with three

fix

screws.

Reconnect the disconnected connectors (head, stepping motor, spindle motor,
index sensor, and write protect sensor).

d)

track sensor,

Bend the two shield board pins and fix the head cable.
track sensor (5-3), azimuth (5-4), index burst
f) Check the spindle speed (5-1), radial track (5-2),
time (5-5), level (5-6), resolution (5-7), symmetry (5-8) and write protect sensor (5-9) after mounting.
e)

and

Note: Insert the head cord under the shield board

Printed Circuit Board

Fig. 4-1

4-2

fix at

the

same

routing as before exchange.

Removal

Lever Exchange (See Figure 4-2)

Removal

4-2-1 Lever
a)

Set the lever horizontally.

b)

Unfasten the

c) Pull

fix

screw

of the lever.

the lever forward.

4-2-2 Lever Mounting

Place the wide part of the lever cam on the hub side and check that the lever shaft hole can be
seen from above. (Hub open state).
b) Set the lever horizontally and insert from the front.
a)

c)

4-3

Secure the lever with a screw.

Front Plate Exchange (See Figure 4-3).

4-3-1 Front Plate

Removal

a)

Remove

b)

Unfasten the two front plate

c) Pull

the lever as described
fix

in

4-2-1.

screws.

^

the front plate forward.

4-3-2 Front Plate Mounting
a) Insert
b)

the front plate from the

Secure the

Mount the
4-4

Eject

4-4-1 Eject

front plate with

lever as described

front.

two screws.
in

4-2-2.

Assembly Exchange (See Figure

4-4)

Assembly Removal.

b)

Make the lever vertical (clamp state).
Remove the printed circuit board as described

c)

Insert protection

a)

to protect
d)

Unfasten the two Eject Assembly

e) Lift

in

4-1-1.

paper (high quality white paper approximately

10x30 mm) between

the heads

them.

the top head (approximately 2

fix
-

screws.

3 mm), and remove the Eject Assembly.

Assembly Mounting and Adjustment.
a) Lift the top head and insert the Eject Assembly under the Head Arm.
b) Adjust the position of eject assembly that the ejector lock when the diskette is inserted and the
diskette is ejected when the lever is operated and secure the eject assembly with two screws.

4-4-2 Eject

8

c)

Remove

d)

Mount the

the protection paper.
printed circuit board as described

in

4-1-2.

4-5

Lever Frame Assembly Exchange (See Figure 4-5)

4-5-1 Lever

Frame Assembly Removal

d)

Remove
Remove
Remove
Remove

e)

Unfasten the

a)

b)
c)

the printed circuit board as described
the lever as described

in

4-1-1.

4-3-1
4-4-1.

in

four lever frame assembly

Lift the lever frame
slidinh to the left.

a) Lift

in

4-2-1.

the eject assembly as described

f)

4-5-2 Lever

in

the front plate as described

screws.

fix

assembly slightly making sure that the top head

Frame Assembly Jvlounting and Adjustment.
the top head slightly and slide the pad mounting

is

not raised, and

part of the lever frame

remove the

assembly under the

top head.
b)

Secure the

c)

Mount the
Mount the
Mount the

d)
e)

lever frame

eject

assembly with

four screws.

assembly as described

front plate as

described

lever as described

in

in

in

4-4-2.

4-3-2.

4-2-2.

Unfasten the two screws of hub shaft holder and centre by moving the hub up and down several
times and secure the two screws.
f)

Mount the

g)

Ilj^

printed circuit board ad described

in

4-1-2.

mounting, adjust the index burst time. (Refer to

h) After

4-6

Stepping Motor Assembly Exchange (See Figure 4-6)

4-6-1

Stepping Motor Assembly Removal

Remove

a)

the printed circuit board as described

b)

Unfasten the head assembly metal

c)

Unfasten the stepping motor belt

d)

Unfasten the two stepping motor assembly

e) Lift

in

5-5).

4-1-1.

belt fix screw.

fix

screw and remove the keep
fix

plate.

screws.

the stepping motor assembly upward, then slide

it

to the

left

to

remove from the metal

belt.

Disconnect the stepping motor assembly cord from the hook.

f)

4-6-2 Stepping Motor

Assembly Mounting Adjustment

Keep the metal

a)

belt in the loop form, insert the stepping

motor assembly, mount the metal

belt

and keep plate with screws.
Align the oval hole of the stepping motor mounting plate with the guide pin
stepping motor assembly with two screws.
Temporary tightening of screws are required.
b)

c) Pull

the

tip of

the metal belt and mount the metal belt on the

tip of

and mount the

the head assembly with a screw.

Move

the head assembly back and forth and check that the metal belt is not twisted. If twisted,
loosen the metal belt fix screws on the stepping motor assembly and head assembly, and
move the head assembly back and forth several times.
Fasten the screws tightly.

d)

slightly

Place the stepping motor assembly cord on the hook.

e)

Mount the

f)

printed circuit board as described

in

4-1-2.

g) Adjust the radial track after mounting. (Refer to 5-2).

Caution:

Do

not reuse the metal belt removed from the head assembly.

4-7

Head Assembly Exchange (See Figure

4-7-1

Head Assembly Removal

4-7)

Remove the printed circuit board as described in 4-1-1.
Remove the lever as described in 4-2-1
Remove the front plate as described in 4-3-1.
d) Remove the eject assembly as described in 4-4-1.
e) Remove the lever framne assembly as described in 4-5-1
f) Remove the stepping motor assembly as described in 4-6-1.
g) Unfasten the PCB post fix screws and remove the PCB post.
a)

b)

c)

h)
i)

Unfasten the two screws fastening the guide shaft keepers A and B and remove keepers A and

Lift

B.

the guide shaft rear edge and remove the guide shafts in a backward direction, individually. Be
damage guide shafts or mix the right and left shafts.

careful not to
j)

4-7-2

Carefully

remove the head assembly.

Head Assembly Mounting and Adjustment
the two guide shafts in the head assembly without mixing the right and
housing while holding the guide shaft.

a) Fit

b)

Secure guide shaft keepers A and B using four screws.

left,

and mount

in

the

Secure the

c)

PCB

post using screws.

Mount the stepping motor assembly as described in 4-6-2.
Mount the lever frame assembly as described in 4-5-2.
f) Mount the eject assembly as described in 4-4-2.
g) Mount the front plate as described in 4-3-2.
h) Mount the lever as described in 4-2-2.
d)

e)

Place the printed circuit board as described

i)

in

4-1-2.

(5-5), and checktheO track sensor(5-3),
j)Adjustthe radial track(5-2) and index burst time
resolution (5-7) and symmetry (5-8) after mounting.
azimuth (5-4), level (5-6),

4-8

Spindle Motor Assembly Exchange (See Figure 4-8)

4-8-1 Spindle
a)

b)
c)

d)
e)

Motor Assembly Removal
the printed circuit board as described

Remove
Remove
Remove
Remove
Remove

the lever as described

in

4-1-1.

in

4-2-1.

the front plate as described

in

4-3-1.

the eject assembly as described

in

4-4-1.

the lever frame assembly as described

in

4-5-1

four spindle motor fixing screws (three screws on top and one screw on

Unfasten the
the bottom).
f)

Remove the spindle motor
the spindle.
g)

in

a

downward direction. Be careful

not to

damage the top surfaces of

4-8-2 Spindle Motor Assembly Mounting Adjustment

Secure the spindle motor with
centre of the housing hole.

four screws. Align the

a)

b)
c)

d)
e)

Mount
Mount
Mount
Mount

the lever frame assembly as described
the eject assembly as described
the front plate as described
the lever as described

in

in

in

W/P LED

approximately the

^

4-5-2.

4-4-2.

4-3-2.

4-2-2.

Place the printed circuit board as described

f)

in

in

4-1-2.

track sensor (5-3) and index burst time (5-5)
g) Adjust the spindle speed (5-1 ), radial track (5-2),
and check the azimuth (5-4), level (5-6), resolution (5-7), symmetry (5-8) and write protect sensor (59) after mounting.

Track Sensor Assembly Exchange (See Figure 4-9)

4-9

Track Sensor Assembly Removal

4-9-1

Remove

a)

4-9-2

the printed circuit board as described

b)

Unfasten the

c)

Remove

the

track sensor assembly

fix

in

4-1-1.

screw.

track sensor assembly.

Track Sensor Assembly Mounting and Adjustment.
track sensor assembly with screws.
a) Mount the
Temporary tightening of screws is required.
b)

Place the printed

c)

Adjust the

circuit

board as described

in

4-1-2.

track sensor after mounting. (Refer to 5-3).

^

4-10 Metal Belt Exchange (See Figure 4-10)

4101 Metal Removal

Remove the printed circuit board as described in 4-1-1.
b) Remove the lever as described in 4-2-1.
c) Remove the front plate as described in 4-3-1.
d) Remove the eject assembly as described in 4-4-1.
e) Remove the lever frame assembly as described in 4-5-1.
f) Remove the stepping motor assembly as described in 4-6-1.
g) Remove the head assembly as described in 4-7-1.
a)

h)

Unfasten the metal belt

fix

screws and remove the metal

belt

from the head assembly.

4102 Metal Belt Mounting and Adjustment
a) Mount the metal belt on the head assembly using screws. (Be careful
b) Mount the head assembly as described in 4-7-2.
c) Mount the stepping motor assembly as described in 4-6-2.
d) Mount the lever frame assembly as described in 4-5-2
e) Mount the eject assembly as described in 4-4-2.
f) Mount the front plate as described in 4-3-2.
g) Mount the lever as described in 4-2-2.
h) Mount the printed circuit board as described in 4-1-2.
i)

10

Adjust the radial track (refer to 5-2), index burst time

(5-5),

and

of

the metal belt direction).

track sensor (5-3) after mounting.

5.

Adjustments and Checks

5-1

Spindle Speed Adjustment

and clamp a blank diskette by rotating the motor.
Stop on
track.
Connect the frequency counter to TP6.
d) Rotate the speed adjusting variable resistor on the spindle-motor printed circuit board and
adjust so that the counter shows 200 +2 ms.
If the spindle-motor is not an adjusting variable resistor type, check the counter shows
200 ±2 ms only and adjusting is unnecessary.

a) Insert

b)
c)

fc

^_
5-2

Radial Track Adjustment
a) Insert

b)
c)

Move

a

CE

diskette.

the head to Track

Adjust as follows

if

one

of

1

6 and check the cat's-eye waveforms of the top and bottom heads.

the top or bottom heads

is

not

more than 75%

in

an amplitude

ratio of

two waveforms.
stepping motor assembly and move the stepping motor
assembly back and forth to adjust the amplitudes. The amplitudes of two waveforms should be
nearly the same. Then tighten the rear screw.
d) Slightly

e)
f)

loosen the

Check the

fix

cat's-eye

Repeat from

d)

if

screws

of the

waveforms

adjustment

of the top

and bottom heads.

fails.

Measuring Conditions
Channel 1-TP1 (10mV/div) MODE-ADD
Channel 2-TP2 (10mV/div) Sweep-20ms/div

Head Reading Outouc Signal (TP1 -TP2)

—

X

I

2;

7 5

%

b

Fig.

5-

11

Track Sensor Adjustment

5-3

CE

a)

INsert a

b)

Continuously seek between

tracks of

diskette.

DFC222A

and

2 Tracks at the

minimum access time between

specifications.

Adjust the
track sensor assembly so that the step signal and
timing as shown in Figure 5-3.
Then secure with a screw.
c)

track

one are always on the

Measuring Conditions
Channel 1-TP4 (0.2V/div) MODE-DUAL
Channel 2-TP8 (0.2V/div) Sweep-10ms/div

A

2TK

1TK

QTK

1TK

2TK

Step Signal

TK Signal

J

Direction

5-4

<\

Azimuth Check
a) Insert

a

CE

diskette.

b) Move the head to Track 34 and check that the azimuth waveforms of the top and bottom heads
are as described in Figure 5-4.
c)

Exchange the head assembly if the azimuth

of

one of the top and bottom heads is not as shown

Figure 5-4.

Measuring Conditions

Channel 1-TP1 (10mV/div) MODE-ADD
Channel 2-TP2 (10mV/div) Sweep-1 ms/div
Trigger— TP6

Shows
L)

Wher. a>d
v..

(negative")

tiinuta
2">

=- V,

Vher.

awi&P*

A = 270 mV

I"

i

n

^*=*hmji^

13

5-7

Resolution Check
a)

Insert a blank diskette.

b) Move the head to Track 39, write
average output level.

1

F and 2F by the top and bottom heads, then measure the

The resolution is higher than 55%, and calculations
2F output (mV)/1 F output (mV) x 1 00>55%

c)

shall

be as follows:

Measuring Conditions

Channel 1-TP1 (10mV/div) MODE-ADD
Channel 2-TP2 (10mV/div) Sweep-20ms/div
Trigger— TP6

Resolution

=

2F average output
1

95%
55%
5-8

level

F average output level

or less with TKO
or more with TK39

Symmetry Check
a) Insert

a blank diskette.

b) Move the head to track
and write 1 F by the top and bottom heads.
Measuring Conditions
Channel 1-TP5 (0.1V/div) MODE--CH1
Trigger— INT.CH1
Sweep-0.5ms/div

Slope(+)

T = 400 ns or
(If

5-9

you have individual spec,

Write Protect Sensor

less

this item

obey your

spec.)

Check

Load and unload a diskette and check that write protect sensing

is

definitely

made

using Brikon.

5-10 Head Cleaning

Check for excessive dust or oxidised magnetic

powders on the load pad using such a dentist's
mirror. Clean the heads using a cloth that produces no flues or an applicator dipped in 91%
isopropyl alcohol. Clean the heads carefully and remove accumulated dust and oxidised magnetic
iron powders. Wipe the head using a cloth that produces no flues.

14

iron

THIS

FD-3 EXPLODED VIEW
DRAWING REFERS TO ALL THOSE DESCRIBED

IN

THE TEXT

J§ -5
15

16

17

ELECTRICAL PARTS LIST

Decription
Circuit Reference
Metal Oxide Resistors
0.22ohm/y2 W
R544, 545

Part No.

22kohm/3W
82kohm/1W

R407
R428
R506
R513
R802
R512
R509

Fuse Resistors
1ohm/ /2W
10ohm/ AW
22ohm/ /2W
39ohm/ /4W
1kohm/ /4W

R427
R516
R426
R406
R515

171594
809256
171595
171596
171597

0.22ohm/1W
0.33ohm/2W

R547-550

R504
R415
R520

1ohm/1W
47ohm/1W
56ohm/1W
56ohm/2W
100ohm/1W
470ohm/1W
1kohm/1W

R541
R511

2.2kohm/1W
4.7kohm/2W

1

1

1

1

1

Cement

Resistors

5.6ohm/5W
R501
Ceramic Capacitors
680pF
C540
2000pF/4kV
C539
0.001 5uF/500V
C524
0.0022uF/2kV
C502-504
0.0056uF/500V
C516, 520, 527
|

C508

0.01uF/1kV

1422133
1400213
170430
171598
1400223
171599
171600

Electrolytic Capacitors

C427
C429
C505
C435
C517
C522
C425
C530

10UF/25V
10uF/160V
150uF/400V
220uF/35V
330uF/35V
470uF/16V
1000UF/10V
1000uF/16V
1000uF/25V
3300uF/16V
3300uF/35V

C521

C529
C525
|

0.1uF/250VAC

|

C501

171601

171602
171603
20055
171604
1400248
171605
1400158
171606
171607
171608
171609

171610

VR201

Volume Rotary Gang

VR204

VRSF 500ohm
VRSF 500ohm
VR Rotary 30kohm
VRSF 10kohm
VRSF2kohm
VRSF 100kohm
VRSF 5KO
VRSF 1kohm

171612
171613
171614
171615
171616
171617
171618
171619

Power On/Off Switch

171511

171611

500ohm-10kohm

VR402
VR403
VR404
VR405
VR501
VR502-505, 507
Switch

SW501

Part No.

L502
L503
L506

Coil Linearity
Coil Inductor
Coil Line Filter AC
Coil
Coil
Coil Core Tridal

L801
T401
T501
FB401

Trans Horizontal Drive
Transformer Switching
Flyback Transformer

171557
171558
171559
171502
171560
171504
171620
171561
171562
171563
171564

PCB001 MM0018A
PCB002 MS0053A

171565
171566

CRT

171567

L402
L501

P.C.

Filter

Line

Boards

Jack
Socket

Miscellaneous

CD201
CD402

CD403
CD404
CD502
CD801
DY401
TH401
V801

Cord
Cord
Cord
Cord
Cord
Cord

171568
171569

DIN

Jumper
Jumper
Jumper

17lA||i

DIN
Connector

171571
171572
171573
171574
171575

DY
Thermistor
Tube, Cathode Ray

340AXBWDN
Fuse

Fuse

171621

3.1 5A(T)

PC-CM
OEC9001
TC74HC02P
UPC1378H

IC101

I.C.

IC102

I.C.

IC401

I.C.

IC402

LA7820
STK7356
L78M12

IC501

IC502
IC503
IC601

IC602
IC603
IC604

ICP501.502
ICP503

1771477
171622
170444
1400368
190062
190063
171479
171480
170112
171481
171075

L78M05
STK7358
BA6993
LA6324
BA707
ICP-N75
PFR-315-F003
ICP-N50

1714
171

2SC1815

170447

803
2SA1015
Q401,402,603,
606,607,613,617

170453

Q101-103, 105113, 401, 601,
602, 610-612,
616, 618, 801-

Q403
Q404
Q604, 605
Q608, 609, 615

Q614

2SD1426
2SC2271
TLP580
2SD1207-T

171484
170449
171485
170451
171486
171487

2SB1134R
2SC3789
-

18

&S

Transistors

Q804-806
l

Description

CoreTridal L201

ICP601

Variable Resistors

VR401

Reference

& Transform ers

L201
L401

I.C.'s

Metal Polycarbonate Capacitors

0.1uF/250V
C428
Metal Plastic Capacitors

Circuit

Coils

171584
171585
171072
171069
171586
171587
171588
171589
171590
170406
171591
171076
171592
171593

-

.,.-

-

-.

ELECTRICAL PARTS LIST

Description

Reference

Part No.

R181
R189-194

1kohm

10061

Resistor Network

4.7kohm

NR101

NR102
NR103
NR104
NR105

1

kohm

x 7
x 5

2.2kohm x 6
2.2kohm x 5
4.7kohm x 8
Lkohm x 10

NR801
Ceramic Capacitors
C805, 806
47pF NPO
0.1

Description

Circuit

Part No.

Reference

Transistors

Resistors

5.6ohm Fuse

C504-506, 802, 803
Trimmer 200pF Ceramic

uF

TC101

2SC1815Y
2SA1015Y
KTC2120

171666
171667
171668
171669
171670

Switches

171671

PCB

171672
171058
171371

170447
170453
170113

Q101, 102, 105
Q103, 104, 106, 107
Q1 08-1 13

171409

Switch Key Board

SW801
Variable Resistors

Volume Control CPU

VR401

Unit

171579

Assy's

CPU PCB MC0032B
LED PCB MC0033B

PCB101
PCB102

Part of

Keyboard PCB

PCB801

171410

PCB101

MK002A

171412

PC-MM

Electrolytic Capacitors

47uF/16V

!

20027

C801

TC74HC04
AN5753
UPC1031H2

IC201
IC401

Crystals

X101

Crystal

X102
X103

Ceramic Oscillator

X801

Ceramic Oscillator KBR-6.0M

171372
171373
171374
171375
171376
171377

L101, 102

171404

Crystal
Crystal
Crystal

m

HC49U.843M

DSVT30032K
HC18RW24.0
HC18RW28.636

Coils

IC402
IC501
IC502
IC503
IC504

STK7356
BA6993
LA6324
BA707
502

ICP-N50

40008/A
151040
171546
171478
171480
170112
171481
171547

Transistors

Inductor Coil

Jacks & Connectors
14 Pin DIL
8 Pin DIL
20 Pin DIL
9 Pin D

Intergrated Circuits

SKT

Mate N Lock
Mate N Lock
Socket D Sub
DIN Cord 6 Way

J1 03-1

170120
170119

CD101

170121
171408
171673

J101, 102

20
J121, 122
J801

CE101-103
CD801

171674
171675
171420

Reference No.

Part No.

CD104

Semiconductors
Description

Diodes

DS442X-BT
TLS134A LED

D101-104, 501, 502,801

D503

1422117
171403

IC's

MC1488P
1489AP
•«r7406P

IC104
IC105, 122

INS8250N

IC106

DN74LS240P
DN74LS244
MBL8259A-2P
DN74LS125P
SED9420CAC

IC107, 117
IC108, 115, 121, 124

UPD765AC-2

IC112
IC113
IC114
IC116
IC118
IC120
IC123
IC125
IC126
IC127
IC128
IC129
IC130

MBL8086-2P

DN74LS245P
AMS40039
AMS40041
AMS40045
TC74HCUD4P
AMS40043
UPD8237AC-5
UPD4126C-15
AMS40044
MC146818P
MN41256-15
LA4140

AMS40042
TC74HC14P

Q402
Q501, 502, 514,
518, 519
Q503, 507, 508,
517
Q504, 505

Q507
Q509, 510, 516
Q513, 515

Q801
Diodes
D207

2SD1159
2SC536

170453
170623
150350

2SA608

920113

TLP580
2SC2229
2SD1207
2SB1134R
2SC2229

171548
170624

MTZ5. 1 BT-77
ISS231T-77

D.Z.

D208, 401,402,
410,512, 513, 517

170114

D.

170451

171486
170624
1422112
171582

521, 524, 525

IC101
IC102, 103

DN74LS373

DN74LS174P
UPD8253C-5
DN74LS14P
AMS40040

2SC1815
Q201-203, 205,
401,506, 511, 512
2SA1015
Q204, 520

IC109
IC110
IC111

IC131, 133

IC132
IC134
IC135-152
IC401
IC801

IC802

171378
171379
171380
170108
171381
171382
171383
171384
171385
171034
40018
171387
171388
171389
171391
171392
171393
171577
171394
171395
40008/A
171396
171397
171398
171578
171399
171400
170111
171401
171033

D403

11E2TA1 Diode Silicon
D.10ELS4 Diode Rectifier
D.11E1TA1 Diode Silicon
D.Z. GZA6.2Y Diode Zener
D.KDS1555 Diode Silicon
D.20E10FA13

C.

D404, 405, 407

D406
D408
D409
D501-504
D505
D506
D507
D508-510

D.Z.

GZB18B

D.DFC15L-KC5
D.Z. GZB9.1B
D.DFH10G-KB4

GZA18YBT

D511, 526, 527

D.Z.

D514
D515
D516
D517

D.30DF2
DSF 10B

D520, 801

D522
D523
D528-531

D.F5KQ60
D.F10PO4Q
D.DS442X-BT
D.Z. MTZ5.1BT
D.Z. MTZ5.6BT
D.KDS1555

Carbon Film Resistors
R572
330ohm/ /4W
R571
470ohm/ AW
R573
10kohm/ /4W
R238-243
75ohm/V2W
1

1

1

171549
171550
171551

171552
800222
171048
171553
171491
171493
171492
171554
171555
171556
171496
171497
1422117
1422112
171499
810332

10044
10048
10085
151583

19

ELECTRICAL PARTS LIST
Circuit

Reference

Diodes
D101-105
D106-115, 401405, 407-409,
505, 608, 609,
613, 616-620
D406, 412, 413,

Description

Part No.

MTZ6.8BT-77
ISS132T-77

171488
171489

DFD05G

171490

610

D410
D411

D.Z.MTZ11BT
C.BB4-FC

D501- 504
D506, 603
D507, 509, 604-

20E10FFA13
DFC15L-KC5
DFH10G-KB4

171623
1422116
170848
171491
171492

606
D508, 602

GZB9.1B
30DF6-FC
SR-2M

D510
D511
D601

GZB18B
GZA18Y
F5KQ60

D607
D611

D612
F10PO4Q
D614
MTZ5.1BT-77
D615
MTZ5.6BT-77
Carbon Film Resistors
75ohm
R1 54-1 58
|

171493
171494
1400122
171495
171624
171496
171497
171498
171499

Description

0.32MF/200V

15ohm/2W
47ohm/1W
56ohm/1W
68ohm/2W
100ohm/2W
1kohm/1W
2.2kohm/1W
3.3kohm/1W
3.9kohm/1W
4.7kohm/2W
5.6kohm/2W

22kohm/3W
33kohm/2W
82kohm/1W
Fuse Resistors
0.82ohm/1W
1ohm/y2 W
8.2ohm/ /4W
1

lOohm/'AW
100ohm/ /4W
100ohm/ /2 W
470ohm/ /2 W
1 kohm/ViW
1

1

1

Cement

R511

R624
R737
R512
R507, 612

R610
R613
R504
R503
R434
R805-807
R609
R508
R607

R442
R443
R437
R510 616
R412
R444
R509
R614

171625
171072
171077
171626
171627
171628
171629
171630
171631
170406
171632
171633
170407
171634
171635
171636
171637
171638

|

|

Coil Line^.ty
Coil RX-9P-472K
Coil Line Filter AC PLA1022C
Coil Degauss
Coil
Coil ELO606RA-101K

L402

L601
L80 1-804
T401
T501
T601
FB401

Trans, Horizontal Drive
Tranformer, Switching
Transformer, Switching
Transformer Flyback

17l||p
171500
171501
171502
171503
171504
171505
171506
171507
171508
171509

Switches

SW401
SW501

I

|

Switch Slide
Switch Push

171510

PCB MM0019A Monitor Main
PCB MS0054A CRT Socket/

171512
171513

171511

P.C. Boards

PC BO0
PCB002

Colour Drive

Jacks

CRT

Socket,

JC801
Miscellaneous

Socket Cover

1422141
171639
170404

CD101
CD601

Cord DIN 14 Pin
Cord DIN 8 Pin

809256
171640
1400183

TH501

Degauss Element

V801

Tube, Cathode Ray
M34EAQ1 0X-AT1 460/90

ICP501, 502

ICP-N75
PRF-315-F003
ICP-N50

171057
171483
171547

VRSF 1KOhm
VR Rotary 500ohm-500ohm

171691
171692
171616
171693
171694
171695
171612
171618
171619
171696
171697
171698
171699
171700

171641
171642

F501

ICP503
ICP601

1422138

FuseS506

171514

CRT

3.15A(T)

171

l

6.

Now push

7.

1

and press a

key.

(RETURN)

will

RETURN

key (another three times).

now appear so now type format

c:/s

(RETURN).

the Y key (RETURN).

The hard disc will now begin to format, if you have a 1 0Mb machine then
If you have a 20Mb machine then 610 cylinders will
be counted.

cc

in.

8.

Once

9.

Nowtypeconfig(RETURN).Thisprocedurewillcopyallfivediscs(order5,1,2,3,4)ontc

h<

it

will

u_

t )

305

cylinders.

this

is

done, take out disc

1

and

insert disc

5 (the maroon

disc).

Once finished the screen willshowsomeinformationaboutthesizeofthediscandthenumb.

had

&•

nd

f

,

directories present.

To now use the hard disc remove the floppy disc from the driveand store
four discs then restart the computer by pushing Alt Ctrl and Del.
1

0.

in

a safe place wi

After a short while the AMSTRAD PC info will come up and tell you when the machine
and then after a little longer the screen will clear and will display this message,
1 1

was

e

la

ui

F1=DOSPLUS.SYS
F2=DOS.SYS
Select operating system:
If

you choose F1 then

DOS

Plus and

Gem will

be booted, or

if

you press F2 then

MS-DOS will be booted.

25

ALIGNMENT INSTRUCTIONS FOR PC-CM
Equipment required:

Digital Multimeter;

Dummy

Load; 0.82ohm/30W, D.B.O.Scope; Odometer (Teal Time Meter),

Diagnostic Disc/Tool.

Power

To Set +5V.

1.

SIGNAL

FUNCTION

Step

Test Point A

supply.

REMARKS

METHOD

SIGNAL OUT

IN

Adjust

VR604

to read 5.10V

±0 02V.

1)

2)

Refer to Fig. 1.
Prevent short circuit when pulling

the

To Set + 12V.

2.

Power

Test Point

supply.

Adjust

B.

VR603

to read 12

15V +0.02V.

1)

2)

Power supply.

To Set -5V.

Adjust

Test Point C.

VR601

to read

5V ±0.05V.

1)

2)

Power

To set -1 2V.

Adjust

Test point D.

supply.

VR602

to read

12.0V ±0.05V.

1)

2)

Power

To set protect

Pin 11 of 14 Pin

supply.

DIN Plug.

Adjust

VR606

ammeter

adjustment.

in

to read 4.5A

series with

on the

dummy

1)

load.

2)

Load diagnostics

Size setting.

in

PC1512.

Monitor screen.

Adjust
1

Sub Brightness

7.

Control.

Load Diagnostics

in

PC1512.

VR404 so

2mm ±3mm

all

the border
around.

PCB

forward.

PCB

when

pulling

when

pulling

forward.

forward.

Set optimum Brightness &
Contrast setting.

is

VR 102-2 to max. adjustment
level wave form
27% when initial white level is
100% against black scope Q302

Monitor Screen.

forward.

Refer to Fig. 1.
Prevent short circuit

the
V.

6.

PCB

Refer to Fig. 1.
Prevent short circuit

the
5.

PCB

Refer to Fig. 1.
Prevent short circuit when pulling

the
4.

forward.

Refer to Fig. 1.
Prevent short circuit when pulling

the
3.

PCB

Set

1)

Refer to Fig.

2.

VR101 so the grey
is

collector
8.

Sub Contrast

9.

Sub

Control.

Load Diagnostics

in

PC1512.

Monitor Screen.

Select Colour Bar Chart. Set Bright
Control to VR102-2 max. and
VR1 02-1 to min. Adjust VR1 03 to set

Scope

Set VR403 to Mid position.
Adjust VR402 to read

proper intensity
H.

Hold Control.

From IC402

Pin

4.

Pin 4 of IC402.

level.

m

Frequency 15.625kHz.

NOTE
very important to observ the isolated power supply area. Any measurements within the power supply circuit should be
carried with reference to top point of C505 in order to keep the chopper circuit oscillating.
is

It

MAJOR COMPONENTS LOCATION GUIDE

:^s>
oj—
„VR601
(1-5VADJ.

r-GRAY

VR602
-12V ADJ.

VR603
12V AD J.

VR604

Q)

—

Q

.

5VADJ.LJ

12V

PROTECT

—

VR403

,

H.HOLD

00 VR402
SUB

IC101

VR101
IGRAY

CONT.

Q

Qv.size
IC402

Fig. 1.

iVR103

LJsub

H.H0LD

26

-f:phnr
f^uyuuui

VR606

iNTWurrt
Fig. 2.

J

ALIGNMENT INSTRUCTIONS FOR PC-MM
Equipment required:
FUNCTION

Step
1.

Digital Multimeter;

SIGNAL

Dummy

Load;

0.82ohm/30W D.B.O.Scope; Diagnostic

Test Point A.

Disc/Tool.

METHOD

SIGNAL OUT

IN

Power Supply.

To Set +5V.

Adjust

VR505

to read

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5.10V ±0.02V.

Refer to Fig. 3.
Prevent short circuit

1)

2)

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2

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1

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Refer to Fig. 3.
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1)

2)

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1

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ammeter

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in

to read 4.5A

series with

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1)

load.

2)

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the
6.

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tor monitor.

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the.

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to get Circle.

1)

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1)

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1)

Refer to

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1)

Refer to

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adjustment
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when

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when

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2)

7.

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when

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Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.5
Linearized                      : Yes
Page Layout                     : TwoPageRight
Page Count                      : 52
XMP Toolkit                     : XMP Core 4.1.1
Metadata Date                   : 2012:10:05 19:39:35Z
Create Date                     : 2012:10:05 19:33:56Z
Modify Date                     : 2012:10:05 19:39:35Z
Creator Tool                    : Digitized by the Internet Archive
Producer                        : Recoded by LuraDocument PDF v2.53
Part                            : 2
Conformance                     : B
Document ID                     : uuid:uuid:d34f8c49-5eec-c74a-ecd6-7a86a4640036
Version ID                      : 2
Title                           : Amstrad PC1512 PC-MM PC-CM Service Manual
Creator                         : Digitized by the Internet Archive
Keywords                        : http://archive.org/details/amstrad-pc1512-pc-mm-pc-cm-service-manual

EXIF Metadata provided by EXIF.tools