Marantz CDR631 Service Manual page 13

Faultfinding Trees
CD-DA DISC LOADED
DISC
DETECTION &
READING?
YES
DISPLAY:
"CD" &
T.O.C. INFO?
YES
PRESS <PLAY>
ANALOG
AUDIO
OUT?
YES
DISTORTION?
NO
HEADPHONE?
YES
DIGITAL
AUDIO
OUT?
YES
PLAY BACK OF CD-DA
DISCS OK
CHECK:
• WIRING
NO
• POWER SUPPLY VOLTAGES
• ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF "DERRn"
OR "BERRn" ERROR OCCURS
CHECK:
NO
• DISC: DIRT, SCRATCHES, DAMAGED...
• ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF "DERRn"
OR "BERRn" ERROR OCCURS
CHECK:
NO
•
AUDIO CONNECTIONS & CABLES
•
AUDIO BOARD
⇒
FLEX & WIRE CONNECTIONS
⇒
+5V (pin 4. W855), +12V(pin 2. W855), -12V(pin 6. W855)
⇒
SEE FAULTFINDING GUIDE AUDIO BOARD - ANALOG OUT PATH
• ELECTRICAL SERVICE DIAGNOSTICS:
YES
REPLACE CDR MODULE IF "DERRn"
OR "BERRn" ERROR OCCURS
CHECK:
•
CONNECTION OF HEADPHONE
•
HEADPHONE BOARD
NO
⇒
WIRE CONNECTION
⇒
+10V (pin 6. J903), -10V (pin 2. J903)
⇒
KILL VOLTAGE (pin 1. J903) : -8V DURING PLAY
⇒
KILL TRANSISTORS QN01 - QN02
⇒
PLAY SBC442 DISC (1kHz, -30dB) AND CHECK SIGNAL AT
Q901
•
ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF "DERRn"
OR "BERRn" ERROR OCCURS
CHECK:
•
AUDIO CONNECTIONS & CABLES
•
NO
AUDIO BOARD
⇒
FLEX & WIRE CONNECTIONS
⇒
+5V (pin 3. W853)
⇒
CHECK SINGNAL
-FOR COAXIAL OUT AT QT31,LT13
-FOR OPTICAL OUT AT QT31,JT21
• ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF "DERRn"
OR "BERRn" ERROR OCCURS
Figure 6-2
11