Philips CDR779, Service Manual

Page: 49 / 78

Faultfinding trees
GB 49 CDR779 7.
7. Faultfinding trees
7.1 CDR-Module
Figure 7-1
NO DISC LOADED
SWITCH ON POWER
PRESS
< OPEN/CLOSE >
SEE CD-DA DISC
FAULT FINDING
SEE CD-R DISC
FAULT FINDING
SEE CD-RW DISC
FAULT FINDING
INSERT DISC
PRESS < OPEN/CLOSE >
DISPLAY?
DISPLAY:
"INSERT DISC"
CD-DA DISC
LOADED?
CHECK:
•
POWER SUPPLY (SEE FAULT FINDING GUIDE PSU)
⇒
WIRING
⇒
ON/OFF SWITCH
⇒
FUSES
⇒
VOLTAGES
•
DISPLAY (SEE FAULT FINDING GUIDE DISPLAY BOARD)
⇒
WIRING
⇒
CONTROL SIGNALS
⇒
CLOCK SIGNAL 8MHz
⇒
SUPPLY VOLTAGES
⇒
ELECTRICAL SERVICE DIAGNOSTICS:
DISPLAY TEST, KEYBOARD TEST
•
POWER SUPPLY VOLTAGES
•
ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF
"DERRn"
OR "BERRn" ERROR OCCURS
CHECK:
•
MECHANICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF ERROR OCCURS
TRAY?
CD-R DISC
LOADED?
NO NO
NO
NO
NO
YES
YES YES
YES
YES
CD-RW DISC
LOADED?
YES
STBY LED?
PRESS < DISPLAY >
•
MAINS, MAINS CABLE
CHECK:
STANDBY LED
⇒
NO
YES
⇒
KEYBOARD
•
WIRING
•
DISPLAY BOARD (SEE FAULT FINDING GUIDE DISPLAY BOARD)
⇒
WIRING
⇒
CONTROL SIGNALS
⇒
CLOCK SIGNAL 8MHz
⇒
SUPPLY VOLTAGES
⇒
ELECTRICAL SERVICE DIAGNOSTICS:
DISPLAY TEST, KEYBOARD TEST
⇒
KEYBOARD
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