Faultfinding Trees - Philips CDR779 Service Manual

7. Faultfinding trees

7.1 CDR-Module
NO DISC LOADED
SWITCH ON POWER
PRESS <DISPLAY>
PRESS <OPEN/CLOSE>
NO
STBY LED?
YES
CHECK:
•
MAINS, MAINS CABLE
•
POWER SUPPLY (SEE FAULT FINDING GUIDE PSU)
NO
•
DISPLAY (SEE FAULT FINDING GUIDE DISPLAY BOARD)
DISPLAY?
YES
CHECK:
NO
DISPLAY: •
WIRING
"INSERT DISC"
•
POWER SUPPLY VOLTAGES
•
ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF "DERRn"
YES
OR "BERRn" ERROR OCCURS
PRESS
<OPEN/CLOSE>
CHECK:
•
DISPLAY BOARD (SEE FAULT FINDING GUIDE DISPLAY BOARD)
NO
TRAY?
YES
•
MECHANICAL SERVICE DIAGNOSTICS:
INSERT DISC
REPLACE CDR MODULE IF ERROR OCCURS
NO
CD-DA DISC
CD-R DISC
LOADED?
LOADED?
YES YES
SEE CD-DA DISC SEE CD-R DISC
FAULT FINDING FAULT FINDING
Faultfinding trees
⇒
WIRING
⇒
ON/OFF SWITCH
⇒
FUSES
⇒
VOLTAGES
⇒
WIRING
⇒
SUPPLY VOLTAGES
⇒
CLOCK SIGNAL 8MHz
⇒
CONTROL SIGNALS
⇒
KEYBOARD
⇒
STANDBY LED
⇒
ELECTRICAL SERVICE DIAGNOSTICS:
DISPLAY TEST, KEYBOARD TEST
⇒
WIRING
⇒
SUPPLY VOLTAGES
⇒
CLOCK SIGNAL 8MHz
⇒
CONTROL SIGNALS
⇒
KEYBOARD
⇒
ELECTRICAL SERVICE DIAGNOSTICS:
DISPLAY TEST, KEYBOARD TEST
NO
CD-RW DISC
LOADED?
YES
SEE CD-RW DISC
FAULT FINDING
Figure 7-1
CDR779 7.
CL 96532076_016.eps
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