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VIDEO SECTION
VIDEO LEVEL ADJUSTMENT
(AUDIO LEVEL/VIDEO CLOCK/AUDIO SERVO
CLOCK CHECK)
oscilloscope
VMP board
TP308 (V-OUT)
+
–
level meter
VMP board
TP415 (L-OUT)
+
TP413 (R-OUT)
–
frequency counter
VMP board
TP70 (54 MHz)
+
TP182 (4.2336 MHz)
–
Procedure :
1. Connect an oscilloscope to TP308 (V-OUT) on the VMP board.
2. Connect a level meter to TP415 (L-OUT) and TP413 (R-OUT)
on the VMP board.
3. Connect a frequency counter to TP70 (54 MHz) and TP182
(4.2336 MHz) on the VMP board.
3. Turn the power ON.
4. Set a test disc (HLV-402 (Part No. 8-909-870-00))
[FUNCTION]
[DSG]
[DIRECTION]
5. Press three buttons
,
and
simultaneously.
6. The message "MPEG AV TEST" is displayed on the liquid
crystal display. Color bar signal outputs and sine-wave (1 kHz
0dB) appears.
7. Adjust the RV501 on the VMP board for 0.714 ± 0.05 Vp-p.
Note: TP308 (V-OUT) on the VMP board must be teminated by 75 Ω.
0.714 ± 0.05 Vp-p
8. Confirm that the value of level meter is 2.5 ± 2.0 dBs. (If audio
[PLAY MODE/TUNING MODE]
output disappear, press the
button, and the message "CD SERVICE" is displayed on the
liquid crystal display)
9. Confirm that the value of frequency counter is 54 MHz ± 400
Hz.
10. Confirm that the value of frequency counter is 4,2336 MHz.
[REPEAT/FM MODE]
11. Press the
button to change the traverse
ON/OFF, and the message "TRAVERSE ON" or "TRAVERSE
OFF" is displayed on the liquid crystal display.
12. Press the
l m
button to turn the optical pick-up inside
position, and the message "SLED IN" is displayed on the liq-
uid crystal display.
13. Press the
M L
button to turn the optical pick-up outside
position, and the message "SLED OUT" is displayed on the
liquid crystal display.
14. Change disc to a MP3 test disc (MP3 1kHz 0dB sine-wave is
recorded)
15. Confirm that the value of level meter is 2.4 ± 2.0 dBs.
– VMP BOARD (Component Side) –
TP308
(V-OUT)
TP70
(54 MHz)
TP182
(4.2336 MHz)
RV501
Video
Level
Adjustment
TP413
TP415
(R-OUT)
(L-OUT)
DECK SECTION
0 dB=0.775 V
Note: Confirm each contents of this section first of all. If the results are
not satisfied, do the adjustment.
1.
The adjustments should be performed with the rated power supply
voltage unless otherwise noted.
2.
The adjustments should be performed in the order given in this service
manual.
3.
The adjustments should be performed for both L-CH and R-CH.
REC BIAS ADJUSTMENT
Procedure:
1. Mode: REC
FUNCTION: MD
MAIN board
AUDIO IN (MD/VIDEO) jack (SJ302)
L-CH, R-CH
1) 315 Hz
50 mV (– 23.8 dB)
2) 10 kHz
AF OSC
600 Ω
attenuator
set
2. Mode: Playback
recorded
level meter
portion
+
set
–
MAIN board
SPEAKER terminals (SJ301)
L-CH, R-CH
3. Confirm playback the signal recorded in step 1 become speci-
fied values as follows.
If these values are out of specification values, adjust the RV101
(L-CH) and RV201 (R-CH) on the TC board to repeat steps
1and 2.
Specified values: Playback output of 315 Hz to playback
output of 10 kHz: ± 0.5 dB
Adjustment Location: TC board
– TC BOARD (Component Side) –
RV101 (L)
RV201 (R)
15
15
blank tape
CN-123
REC Bias
Adjustment
HCD-M80
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