Philips CDR880 - CD-RW Disc Faultfinding Guide

21
CDDA DISC FAULTFINDING GUIDE
CDDA DISC LOADED
NO ERVICE TEST MODE:
ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF ERROR OCCURS.
DISPLAY SHOWS:
T.O.C. INFO
YES
PRESS PLAY
HECK:CONNECTOR BOARD
FLEX CONNECTION TO CDR MODULE
PLAY AUDIO SIGNALS DISC TRACK 15:
SIGNAL OF 5.4 VPP ON PINS 1 AND 5 OF CONN.
1500?
KILL VOLTAGE ON PIN 7 OF CONN. 1500:
-8V DURING PLAY, +5V DURING STOP, PAUSE?
KILL TRANSISTORS 7501, 7502, 7503, 7504
DISTORTION?
ES
YE ERVICE TEST MODE:
7 ELECTRICAL SERVICE DIAGNOSTICS:
NO
ES
YES
REPLACE CDR MODULE IF ERROR OCCURS.
HECK: HEADPHONE BOARD
0
s
ie) WIRING
le ~OP-AMP 7300
KILL TRANSISTORS 7301, 7302
iO
Y
HEADPHONE?
Y
HECK:CONNECTOR BOARD
le) OPTICAL TRANSMITTER 1521
OPTICAL OUT? @ SAFETY RESISTOR 3501
PLAY BACK OF CDDA
DISCS OK
HECK:CONNECTOR BOARD
FLEX CONNECTION TO CDR MODULE
DIGITAL OUT TRANSFORMER 5450
N
N
N
N
PCS 83 982
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