Philips CDR770 - Analog Audio Playback

Service modes, repair tips and faultfinding trees
GB 30 CDR 3rd gen.5.
Figure 5-20
ANALOG AUDIO PLAYBACK
INSERT AUDIO SIGNALS DISC
START TRACK 15(1KHz 0dB)
HF-SIGNAL
ON TESTPOINT HF2 ?
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
CHECK CAHF-SIGNAL ON
TESTPOINT HF1 FOR ACTIVITY
CHECK TR 7375,7373,7371,
7370,7361AND IC 7360
I2S-SIGNALS
ON TESTPOINTS
A14,A15,A16 ?
(DIAGRAM 5)
CHECK IC 7300
CHECK POWER SUPPLY D3V3
CHECK SYS CLK BE ON
TESTPOINT R10 (= 8,4672 MHz)
VoutL AND VoutR
ON TESTPOINTS
A19 AND A20 ?
CHECK POWER SUPPLY IC 7406
CHECK SAFETY RESISTORS
R3411 AND R3439
CHECK V
REF = 1,65V ON PIN 28
AUDIO-SIGNAL
ON TESTPOINTS
A21 AND A22 ?
CHECK POWER SUPPLY IC 7409
CHECK KILL TR 7412 AND 7413
AUDIO-SIGNAL
ON TESTPOINTS
A25 AND A26 ?
CHECK KILL TR 7410 AND 7411
CHECK IC 7408
FOR CDR 775 CHECK IC 7407
ANALOG AUDIO PLAYBACK
OK
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
>800mVpp
eyepattern
2.5V
0,5us/DIV
2ms/DIV
2.4Vpp
19
20
0V
2ms/DIV
4,2Vpp
21
22
MSBMSB LSB
0.5uS/DIV
32
WCLK
BCLK
DATA0
RIGHT CHANNEL
44,1KHz
2,1168MHz
LEFT CHANNEL
HF2
A14 A15 A16
(DIAGRAM 5)
CHECK POWER SUPPLY IC 7701
CHECK IC 7701
(DIAGRAM 6)
(LINE OUT)
(HEADPHONE)
CHECK IC 7409
I2S-SIGNALS
ON TESTPOINTS
A10,A11,A12 ?
(DIAGRAM9)
CL06532018_022.eps
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