Philips CDR930 - Page 32

Service modes, repair tips and faultfinding trees
GB 32 CDR 3rd gen.5.
Figure 5-22
APPLY AUDIO SIGNAL(1kHz 0dB)
ON CONNECTOR 1400 AND ROTATE
THE EASY JOG/ENTER KEY UNTIL
THE DISPLAY SHOWS -12 DB.
SELECT ANALOG RECORDING
INPUT BY PRESSING SOURCE
CHECK AUDIO SIGNAL
ON TESTPOINTS A1 AND A2
NO NO NO
NO
NO
NO
NO
YES YES YES YES
YES
YES
YES
YES
CHECK FLEX - CONNECTOR BETWEEN I/O - BOARD AND MAINBOARD
- - - - -
- -
-
-
- -
-
- -
-
-
- - -
(DIAGRAM 6)
ANALOG AUDIO PATH DURING RECORDING
CHECK AUDIO SIGNAL
ON TESTPOINTS A3 AND A4
(DIAGRAM 6)
CHECK POWER SUPPLY IC 7401 CHECK IC 7401
CHECK AUDIO SIGNAL
ON TESTPOINTS A5 AND A6
(DIAGRAM 6)
CHECK POWER SUPPLY IC 7801 CHECK I2C - SIGNAL OF IC 7801 CHECK IC 7801
CHECK AUDIO SIGNAL
ON TESTPOINTS A7 AND A8
(DIAGRAM 6)
CHECK POWER SUPPLY IC 7405 CHECK IC 7405
CHECK I2S - SIGNALS
ON TESTPOINTS A9, A10 AND A11
(DIAGRAM 9)
CHECK POWER SUPPLY IC 7406 CHECK SAFETY RESISTORS R3411 AND R3439 CHECK Vref = 1,65V ON PIN 28
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
ANALOG AUDIO PATH
DURING RECORDING
OK
0V
TRACK 15 1KHz 0dB
AUDIO SIGNALS DISC
2ms/DIV
5.44Vpp
A1
A2
0V
2ms/DIV
2.68Vpp
A3
A4
0V
2ms/DIV
739mVpp
A5
A6
0V
2ms/DIV
2.44Vpp
A7
A8
MSBMSB LSB
0.5uS/DIV
32
WCLK BCLK DATA1
RIGHT CHANNEL
44,1KHz
2,1168MHz
LEFT CHANNEL
A10A9 A11
A12 A14 A15
A17 A18
CL06532018_024.eps
290200