CDDA DISC FAULTFINDING GUIDE
PLAY BACK OF CDDA
DISCS OK
PRESS PLAY
CDDA DISC LOADED
AUDIO?
CHECK:CONNECTOR BOARD
OPTICAL TRANSMITTER JT02
SAFETY RESISTOR 3501
CHECK:POWER SUPPLY AND AUDIO BOARD
FLEX CONNECTION TO CDR MODULE
DIGITAL OUT TRANSFORMER LT04
CHECK:HEADPHONE BOARD
WIRING
OP-AMP Q901
KILL TRANSISTORS QN91, QN92
CHECK: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.
JT03
KILL VOLTAGE ON PIN 7 OF CONN. JT03:
-8V DURING PLAY, +5V DURING STOP, PAUSE?
KILL TRANSISTORS QN51, QN52, QN53, QN54,
NO
NO
NO
NO
NO
YES
YES
YES
YES
HEADPHONE?
DIGITAL OUT?
OPTICAL OUT?
NO
YES
DISTORTION?
DISPLAY SHOWS:
“CD”
T.O.C. INFO
SERVICE TEST MODE:
ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF ERROR OCCURS.
SERVICE TEST MODE:
ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF ERROR OCCURS.
IC QT01
IC QT01
1-14
