Philips CDR Mozart Service Manual page 20

GB 20 5. CDR Mozart
Digital Audio Path During Playback
DIGITAL AUDIO PATH DURING PLAYBACK
USE FREYA SERVO BOARD CIRCUIT DIAGRAM 2 AND 4 AND
MOZART MAIN BOARD CIRCUIT DIAGRAM 1 AND 3 AND BOTH BOTTOM- AND TOP VIEW: TEST POINTS
DIGITAL AUDIO PLAYBACK
INSERT AUDIO SIGNALS DISC
START TRACK 15(1KHz 0dB)
HF-SIGNAL
ON TESTPOINT HF2 ?
(FREYA DIAGRAM 4)
I2S-SIGNALS
ON TESTPOINTS
A3, A4, A5 ?
(FREYA DIAGRAM 4)
DIGITAL SIGNAL
OUT OF CDR60 ON
TESTPOINT A24
(MOZART BOARD
DIAGR. 3)
DIGITAL SIGNAL
EBU-OUT1 FROM MOZART
TESTPOINT A20
(MOZART BOARD
DIAGR. 1)
DIGITAL SIGNAL
EBU_DIG_OPT_OUT
TESTPOINT A2
(MOZART BOARD
DIAGR. 3)
DIGITAL AUDIO PLAYBACK
OK
Trouble Shooting
-
CHECK CAHF-SIGNAL ON
NO
TESTPOINT HF1 FOR ACTIVITY
-
CHECK TR 7103, 7102, 7105,
7109, 7361 AND IC 7360
YES
A3
2,1168MHz
BCLK
44,1KHz
WCLK LEFT CHANNEL
0.5uS/DIV
MSB
DATA0
-
CHECK IC 7018
NO -
CHECK POWER SUPPLY D3V3
-
CHECK SYS CLK ON
TESTPOINT R14 (= 8,4672 MHz)
YES
-
CHECK CONNECTION FROM CDR
NO
FREYA BOARD CONN. 1000 TO CONN.1201
ON CDR MOZART MAIN BOARD
YES
-
CHECK IC 7000
NO
-
CHECK TR 7011
YES
-
NO
CHECK R 3272
YES
A4 A5
32
LSB
A2 A20
ch1: pkpk= 1.30 V
ch1
ch1: freq= 1.85MHz
1
CH1 1.00 V~
HF2
eyepattern
2.5V
0,5us/DIV
>800mVpp
RIGHT CHANNEL
MSB
A24
MTB 500ns ch1+
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