Philips CDR779 - 7 Faultfinding Trees

Faultfinding trees
GB 49CDR779 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?
NONO
NO
NO
NO
YES
YESYES
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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