Video Section - Sony CX-JV77 Service Manual

CX-JV77

VIDEO SECTION

AUDIO LEVEL, VIDEO CLOCK, AUDIO SERVO
CLOCK CHECK
VMP43GY board
TP415 (L-OUT)
TP413 (R-OUT)
VMP43GY board
TP70 (54 MHz)
TP182 (4.2336 MHz)
Procedure :
1. Connect an oscilloscope to TP308 (V-OUT) on the VMP43GY
board.
2. Connect a level meter to TP415 (L-OUT) and TP413 (R-OUT)
on the VMP43GY board.
3. Connect a frequency counter to TP70 (54 MHz) and TP182
(4.2336 MHz) on the VMP43GY board.
3. Press the button to turn the power on.
I/1
4. Set a test disc (HLV-402 (Part No. 8-909-870-00))
5. Set to the MPEG AV TEST mode. (Refer to the CD SERVICE
MODE (See page 17))
6. The message "MPEG AV" is displayed on the flourescent
indicator tube. Color bar signal outputs and sine-wave (1 kHz
0dB) appears.
7. Confirm that the value of level meter is 2.5 ± 2.0 dBs. (If audio
output disappear, press the [PRESET EQ] button, and the
message "SERVICE MODE" is displayed on the flourescent
indicator tube)
8. Confirm that the value of frequency counter is 54 MHz ± 400
Hz.
9. Confirm that the value of frequency counter is 4,2336 MHz.
10. Change disc to a MP3 test disc (MP3 1kHz 0dB sine-wave is
recorded)
11. Confirm that the value of level meter is 2.4 ± 2.0 dBs.
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level meter
+
–
frequency counter
+
–
– VMP43GY BOARD (Component Side) –
TP70
(54 MHz)
TP182
(4.2336 MHz)
TP413
TP415
(R-OUT)
(L-OUT)