Philips CDR570 Service Manual page 31

Service modes, repair tips and faultfinding trees
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)
YES
CHECK I2S - SIGNALS
ON TESTPOINTS A13, A14 AND A15
(DIGRAM 9 AND 5)
YES
CHECK EFMDATA AND
EFMCLOCK ON TESTPOINTS
A17 AND A18
(DIAGRAM1)
YES
CHECK ACTIVITY
ON TESTPOINT A27
(DIAGRAM1)
YES
DIGITAL AUDIO PATH
DURING RECORDING
OK
A23
-
CHECK FLEX - CONNECTOR
NO
BETWEEN I/O-BOARD AND
MAINBOARD
A13 A14 A15
2,1168MHz
BCLK
44,1KHz
LEFT CHANNEL
WCLK
0.5uS/DIV
MSB
DATA1
-
CHECK POWER SUPPLY IC 7701
NO
-
CHECK IC 7701
-
CHECK POWER SUPPLY IC 7300
NO
-
CHECK I2C - SIGNAL OF IC 7300
-
CHECK IC 7300
- CHECK POWER SUPPLY IC 7008
NO
-
CHECK I2C - SIGNAL OF IC 7008
CHECK IC 7008
-
A18
Figure 5-21
CDR 3rd gen.
32
RIGHT CHANNEL
LSB MSB
A17
CL06532018_023.eps
5. GB 31
290200