AMSTRAD CTM644 - CPC6128 Basic Hardware Diagnostics

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