Philips CDR779 - Page 50

Faultfinding trees
GB 50 CDR7797.
Figure 7-2
PLAY BACK OF CD-DA
DISCS OK
PRESS <PLAY>
CD-DA DISC LOADED
CHECK:
CHECK:
•
PLAY AUDIO SIGNALS DISC TRACK 15:
SIGNAL OF 5.4 VPP ON PINS 1 AND 3 OF CONN.
1000
KILL VOLTAGE (pin 7 conn. 1000):
-8V DURING PLAY
NO
NO
NO
NO
NO
YES
YES
YES
YES
HEADPHONE?
DIGITAL
YES
DISTORTION?
DISPLAY:
“CD” &
T.O.C. INFO?
YES
DISC
DETECTION &
READING?
• ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF
"DERRn"
OR "BERRn" ERROR OCCURS
CHECK:
• DISC: DIRT, SCRATCHES, DAMAGED...
NO
• POWER SUPPLY VOLTAGES
• ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF
"DERRn"
OR "BERRn" ERROR OCCURS
CHECK:
• WIRING
I/O BOARD
⇒
FLEX CONNECTION
⇒
⇒
⇒
+5V (pin 8 conn. 1000)
KILL TRANSISTORS 7006,7007,7008, 7009
AUDIO
ANALOG
OUT?
• ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF
"DERRn"
OR "BERRn" ERROR OCCURS
•
AUDIO CONNECTIONS & CABLES
CHECK:
•
I/O BOARD
⇒
FLEX CONNECTION
⇒
+5V (pin 8 conn. 1000)
• ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF
"DERRn"
OR "BERRn" ERROR OCCURS
•
AUDIO CONNECTIONS & CABLES
⇒
•
WIRING OF HEADPHONE/IR BOARD
• ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF
"DERRn"
OR "BERRn" ERROR OCCURS
CHECK:
DIGITAL OUT TRANSFORMER 5450, IC7005
•
AUDIO CONNECTIONS & CABLES
•
I/O BOARD
⇒
FLEX CONNECTION
⇒
⇒
+5V (pin 8 conn. 1000)
• ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF
"DERRn"
OR "BERRn" ERROR OCCURS
AUDIO
OUT?
CL 96532076_017.eps
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