Philips CDR770 - Digital Audio Path During Recording

Service modes, repair tips and faultfinding trees
GB 31CDR 3rd gen. 5.
Figure 5-21
NO
DIGITAL AUDIO PATH
DURING RECORDING
CONNECT DIGITAL INPUT FROM
EXTERNAL SOURCE AND
SELECT THE DIGITAL RECORDING
INPUT BY PRESSING SOURCE
CHECK DIGITAL SIGNAL
ON TESTPOINT
A23
(DIAGRAM9)
CHECK FLEX - CONNECTOR
BETWEEN I/O-BOARD AND
MAINBOARD
-
NO
NO
NO
YES
YES
YES
YES
-
-
-
-
-
-
-
-
CHECK I2S - SIGNALS
ON TESTPOINTS A13, A14 AND A15
(DIGRAM 9 AND 5)
CHECK POWER SUPPLY IC 7701
CHECK IC 7701
CHECK POWER SUPPLY IC 7300
CHECK I2C - SIGNAL OF IC 7300
CHECK IC 7300
CHECK EFMDATA AND
EFMCLOCK ON TESTPOINTS
A17 AND A18
(DIAGRAM1)
CHECK ACTIVITY
ON TESTPOINT A27
(DIAGRAM1)
CHECK POWER SUPPLY IC 7008
CHECK I2C - SIGNAL OF IC 7008
CHECK IC 7008
DIGITAL AUDIO PATH
DURING RECORDING
OK
MSBMSB LSB
0.5uS/DIV
32
WCLK
BCLK
DATA1
RIGHT CHANNEL
44,1KHz
2,1168MHz
LEFT CHANNEL
A14A13 A15
A23
A17
A18
CL06532018_023.eps
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