Philips CDR770 - 5.2.5 Audio Signal Check; Digital Audio Playback

Service modes, repair tips and faultfinding trees
GB 29CDR 3rd gen. 5.
5.2.5 Audio signal check
Figure 5-19
DIGITAL AUDIO PLAYBACK
INSERT AUDIO SIGNALS DISC
START TRACK 15(1KHz 0dB)
HF-SIGNAL
ON TESTPOINT HF2 ?
NO
NO
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)
DIGITAL AUDIO PLAYBACK
OK
-
-
-
-
-
-
-
>800mVpp
eyepattern
2.5V
0,5us/DIV
MSBMSB LSB
0.5uS/DIV
32
WCLK
BCLK
DATA0
RIGHT CHANNEL
44,1KHz
2,1168MHz
LEFT CHANNEL
HF2
A14 A15 A16
(DIAGRAM 5)
DIGITAL SIGNAL
OUT OF DASP ON
TESTPOINT A24
(DIAGRAM 9)
CHECK POWER SUPPLY IC 7701
CHECK IC 7701
NO
TESTPOINT A24
CL06532018_021.eps
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