AMSTRAD CPC464 User manual

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CONTENTS
Page
Techmcal Specification 2
Flash Test 2
CPC464 Cabinet Parts List 2
CPC464 Keyboard Cabinet Drawing 3
Cassette Mechanism and Parts List 4,5,6
Cassette Deck Alignment Instructions 6
CPC464 Cassette PCB 7
CPC464 Cassette Deck Circuit Diagram 8
CPC464 Basic Hardware Analysis
Cassette & Software Analysis 10
CPC464 Function Diagrams 10 & 11
CPC464 Main PCB 12,13 & 14
CPC464 Circuit Diagram 15 &16
CPC464 Electrical Parts List 17
GT64 Cabinet Drawing and Parts List 18
GT64 Circuit Diagram & Voltages 19
GT64 Main PCB & Alignment Instructions 20
GT64 Electrical Parts List 21
CTM640 Cabinet Drawing & Parts List 22
CTM640 Electrical Parts List 23 & 24
CTM640 Alignment Instructions 23
CTM640 Voltages 24
CTM640 Circuit Diagram back pull out
CTM640 PCB back pull out
SAFETY TEST
All monitors are safety tested
to the following specifications.
1). Flash Test
Test at 4kV 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
Test between the live and
neutral of the mains lead
joined together and ALL
accessible metal points on the
esterior 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.
TECHNICAL SPECIFICATION
LSI CHIPS:
Z80A processor running at 4MHz
64K bytes of RAM (over 42K available to user)
32K bytes of ROM containing BASIC and the
operating system
6845 CRT controller device
Gl sound generator chip
AY-3-8912 3 voice, 7 octave
8255 parallel 1/0 device interface to the Gl
sound chip
DISPLAY SPECIFICATION:
Mode
Normal High Res. Multiclr.
No. of 4 from 2 from 16 from
Colrs. 27 27 27
Vert. 200 200 200
Dots.
Horiz. 320 640 160
Dots.
Horiz. 40 80 20
Chars.
KEYBOARD:
74 keys — qwerty style, numeric cluster, cursor
and copy cursor, large enter, shift, caps lock, tab,
escape, delete, clear, control.
DATACORDER:
Write speed software selectable — 1K baud or 2K
baud, read speed automatically established by
software. Write protect interlock. Motor on/off
controlled by software.
ADD-ON ABILITY:
Compact floppy disk drive system including CP/M*
and LOGO language.
Centronics compatible printer.
Joystick(s).
Additional ROM’s.
Additional RAM up to 8160K.
EXTERNAL SOCKETS:
PCB edge connectors for general purpose expansion
and Centronics parallel printer.
9 Pin socket for joystick
6 Pin socket for — RGB and sync
— composite video
— luminance and sync
3.5mm socket for stereo sound output
5mm socket for CPC464 power supply (supplied
exclusively from screen)
DIMENSIONS (mm):
w h d
Keyboard : 580 70 =«-170
CTM640 > 375 = 340 365
GT64 > 305 315 335
WEIGHTS (kg):
Keyboard t 2.4
CTM640 > 10.6
GT64 : 6.3
POWER SUPPLY:
Screen System: 240V AC 50Hz
(keyboard and datacorder power supplied by screen
system)
*CP/M is a registered trademark of Digital Research
Inc. AMSTRAD and AMSOFT are trademarks of
Amstrad Consumer Electronics PLC.
In keeping with our policy of continually improving our service, and
technical quality of our products, we reserve the right to change
component types, manufacturers, sources of supply or technical
specification at any time
Keyboard, Colour Monitor. Green VDU — Designed in U.K
Made in Korea
AMSTRAD CONSUMER ELECTRONICS PLC
BRENTWOOD HOUSE, 169 KINGS ROAD,
BRENTWOOD, ESSEX CM14 4EF
Telephone: Brentwood [phone]
Telex: 995417 AMSELE G
CPC464 CABINET PARTS LIST
Sym| Description
1 Top Cabinet 3 Ribs 170001
2 | On/Off Switch 170002
3. | Vol. Control Pot. 170003
4 | Knob Vol. Control 170004
5 |LED Red 170005
6 | Cassette Lid 170006
7 Key Board Assy. 170007A
Z.7D101
7 |Key Board Assy. 170007B
270102
8 | Rubber Contact mat. 170008
Key Board
9 |Rubber Contact Mat 170009
Digit
10 | Rubber Contact Mat 170010
Spacer
11 Bottom Cabinet 170011
3 Ribs
12 |Cassette Mechanism 170012
13 | Tape Counter 170013
14 |Counter Belt 170014
15 | Record Button Cass. 170015
16 | Play Button Cass. 170016
17 |Rewind Button Cass. 170017
18 |Fast Forward Button 170018
Cass.
Stop/Eject Button 170019
Cass.
Pause Button Cass. 170020
Cass. Door Spring 170021
1/0 Socket 170022
User Port Socket 170023
D.C. Socket 170024
DIN Socket 170025
Inlay Main 170026
Inlay Cassette 170027
Keyboard Contact 170028
P.C.B. /A
Keyboard Contact
P.C.B. /B
Bottom Cabinet
5 Ribs
Top Cabinet 5 Ribs
Speaker
170029
170030
170031
170124

CPC464 CABINET DRAWING

CASSETTE MECHANISM

CASSETTE MECHANISM

CPC464 CASSETTE MECHANISM PARTS LIST
Sym |Description
R/P Head
Erase Head
Head Base
Auto Stop Arm
Stopper 809172
Pinch Roller Assembly 809162
Spring Pinch Roller 809161
Fibre Washer 809175
Rewind Spool 809160
Take Up Spool 809159
Record Safety Lever 809158
Idler Gear 809173
Back Up Spring 170203
Main Belt 170204
Flywheel 809156
Locking Plate Stopper 170205
Locking Plate 170206
Spring Post Locking Plate 170207
Motor 170208
Idler Assembly 809155
Pause Lock Plate 809168
Leaf Switch 809157
F.F. Idler Arm Assembly 809152
Eject Lever Cassette Door 170209
Spring Cassette Buttons 170210
Motor Pulley 170211
jLeaf Switch 170212
170201
170202
809170
809171
CASSETTE DECK ALIGNMENT INSTRUCTIONS
To check cassette module independently of the C.P.U. connect 5V DC across points B(-) and C(+),
and link E to G and H to F. The cassette will then operate in an audio mode.
(See page 8 - Cassette Circuit Diagram)
Equipment Required: Frequency Counter, AV.O., V.T.V.M., Oscilloscope & Test Tape.
STEP FUNCTION SIGNAL IN SIGNAL OUT METHOD REMARKS
Cassette Azimuth
Adjustment.
Monitor V.T.V.M. 1) Insert Test Tape recorded at 6kHz constant. Monitor switched on and fix
2) Set Volume to maximum on CPC464. connections.
3) Connect V.T.V.M. to Pin 7 of I.C.302 to read
between 330mV to 520mvV. By adjusting azimuth
screw on the cassette head.
2. Speed Check. Put the standard tape | Monitor Check output from the tape on the oscilloscope. Speed variation £4% will not
in the cassette Oscilloscope. The range to be used is 100uS. affect software loading.
mechanism.

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CONNECT
TO
CPC464
-
BASIC
240V
AC
MAINS
HARDVVARE
ANALYSIS
RED
LED LIGHTS
REPLACE
MAINS FUSE
CHECK FOR
FAULTY CABLE
OR PLUG ASSY
% FROM MONITOR
2 :
uw YES
—_
5
i Coane a FAULTY LED
e SOLDERED. BROKEN PCB TRACK
z q0iNze FAULTY CONNECTER
CHECK KEYBOARD PCB F
FOR SIGNS OF ABUSE: fe)
- CRACKS a
— LIQUID SPILLAGE a
~ DISTORTED MOUNTING 5
CHECK
CONNECTOR
LEAD
#
TEST
SWITCH
AND
TERMINATION
5
ON
COMPUTER
FAULTY
SWITCH
KEYBOARD
UNI
RGB
VIDEO ANY YES
CONNECTOR PICTURE
INSERTED
AT ALL
?
CHECK
KEYBOARD
IF UNIT STILL
TRY
REPLACE OK FAULTLY SEEK
TAPE ANOTHER SPECIALIST CONNECTOR
TAPE ADVICE
NO IMPROVEMENT
FAULTY AUDIO AMP OR SPEAKER
FAULTY VOLUME CONTROL
FAULTY AUDIO CONNECTOR
PLUG /SOCKET
FAULTY AY-3-8192 SOUND IC
SEE CASSETTE
FLOW CHART
NO
K
STILL NOTHING ( FAULTY ULA
rc
A
XK
a
FAULTY VIDEO CONNECTOR
FAULTY CABLE ASSY
FAULTY ULA
FAULTY PCB
r
CHECK FAULTY MONITOR
CABLE TERMINATION
INTERNAL CONNECTORS
% BRIGHTNESS CONTROL
Z80A
6845
CRYSTAL
RAM

CASSETTE & SOFTWARE ANALYSIS
CHECK CLEAN CHECK HEAD CHECK SWITCH CHECK TAPE
CONNECTIONS ON CASSETTE MOTOR CONT-
TO TAPE DECK TAPE HEAD ALIGNMENT KEYS ROL RELAY
POSSIBLE FAULT WITH
COMPUTER BOARD:RAM FAILURE
ULA FAILURE
SOFTWARE
LOADS, BUT
WITH UNUSUAL
RESULTS
N.B ACTUAL ‘PHYSICAL’ DAMAGE TO
Full diagnostic teste on the C.P.U. can be carried out using the SOFTWARE TAPE WILL PREVENT
Amstrad RP1 Test Pack. IT FROM LOADING AT ALL: IE
Please contact Amstrad PLC for information on same. THERE WILL BE NO ‘HALF’ WORKING
PROGRAMS. THEY EITHER LOAD-
OR THEY DON'T.
CPC464 FUNCTION DIAGRAMS
ENA -
(Cil4 veo 8Q 6D 7D 72 62 6D 5D 5a ICH3 Veo 2G ty! 2A4 1¥2 243 13 242 lYA 2Al
OUTPUTIQ ID 2D 20 32 3D 4D 42 GND
CONROL
1C104.105 STROBE A 7
yeroag vec. 26 SELECT PATA INPUTS _ OUTPUT ICHO Yoo ga 4A 4Y 98 3A GY
1G BAA
| A lic ic2 ici ico Vy
PEER iP OE eT
EARERRCAREARCAGE: / BTU EI tI
STROBE. OU BUT
iG seLECT DATA INPUTS 1Y ~ GND PAS IBS 1Ne OA eB 2k “GND
INPUTS OUTPUTS
AB C Dd 9 8
A B CD
BCD -TO-DECIMAL
123456789
ICil2 Veco 4B 4A 4Y 3B GA OY
iclol
fia) fe) fe]
il
1A 1B OLY) 2A 2B O2Y =~ GND
{C106 Vcc 8@ 8D 7D 7Q 6@ 6D 5D 5@ CLOCK ICl25 cc 48 4A 4Y¥ 3B 3A OY
eet Eley)
TEV TT
I
CLEAR 12 ID 2D 2@ 3@ 3D 4D 4 GND iA 1B fy 2A 2B 2Y GND