Philips CDR570 Service Manual page 30

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