Philips CDR570 Service Manual page 40

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GB 40 7. CDR570/930
CD-DA DISC LOADED
PLAY BACK OF CD-DA
Faultfinding Trees
CHECK:
•
WIRING
•
POWER SUPPLY VOLTAGES
NO
DISC
•
ELECTRICAL SERVICE DIAGNOSTICS:
DETECTION &
READING? REPLACE CDR MODULE IF "DERRn"
OR "BERRn" ERROR OCCURS
YES
CHECK:
•
DISC: DIRT, SCRATCHES, DAMAGED...
DISPLAY: NO
•
ELECTRICAL SERVICE DIAGNOSTICS:
"CD" &
REPLACE CDR MODULE IF "DERRn"
T.O.C. INFO?
OR "BERRn" ERROR OCCURS
YES
CHECK:
PRESS <PLAY>
•
AUDIO CONNECTIONS & CABLES
•
I/O BOARD
ANALOG NO
AUDIO
OUT?
YES
•
ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF "DERRn"
OR "BERRn" ERROR OCCURS
CHECK:
YES
•
AUDIO CONNECTIONS & CABLES
DISTORTION?
•
I/O BOARD
NO
•
ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF "DERRn"
OR "BERRn" ERROR OCCURS
CHECK:
•
WIRING OF HEADPHONE/IR BOARD
NO
•
ELECTRICAL SERVICE DIAGNOSTICS:
HEADPHONE?
REPLACE CDR MODULE IF "DERRn"
OR "BERRn" ERROR OCCURS
YES
CHECK:
•
AUDIO CONNECTIONS & CABLES
•
I/O BOARD
DIGITAL NO
AUDIO
OUT?
•
YES ELECTRICAL SERVICE DIAGNOSTICS:
REPLACE CDR MODULE IF "DERRn"
OR "BERRn" ERROR OCCURS
DISCS OK
⇒
FLEX CONNECTION
⇒
+5V (pin 8 conn. 1000)
⇒
KILL VOLTAGE (pin 7 conn. 1000):
-8V DURING PLAY
⇒
KILL TRANSISTORS 7006,7007,7008, 7009
⇒
PLAY AUDIO SIGNALS DISC TRACK 15:
SIGNAL OF 5.4 VPP ON PINS 1 AND 3 OF CONN.
1000
⇒
FLEX CONNECTION
⇒
+5V (pin 8 conn. 1000)
⇒
FLEX CONNECTION
⇒
+5V (pin 8 conn. 1000)
⇒
DIGITAL OUT TRANSFORMER 5450, IC7005
Figure 7-6
CL 96532076_017.eps
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