HCD-RV7/RV8
21
21
– VIDEO BOARD (Component Side) –
TP308
(V-OUT)
TP70
(54 MHz)
TP182
(4.2336 MHz)
TP415
(L-OUT)
TP413
(R-OUT)
RV501
Video
Level
Adjustment
– BD BOARD (Conductor Side) –
TP70
(TE)
TP68
(FE)
TP71
(RFDC)
TP73
(DVC)
TP72
(RFAC)
Note:
Clear RF signal waveform means that the shape “
◊
” can be clearly
distinguished at the center of the waveform.
TRAVERSE LEVEL CHECK
Procedure :
1. Connect an oscilloscope to TP70 (TE) and TP73 (DVC) on the
BD board.
2. Turn the power ON.
3. Load a disc (LUV-P01) and playback the number nine track.
4. Press the
hH
button. (Becomes the 1 track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
Connecting Location:
Note:
1.
CD Block is basically designed to operate without adjustment. Therefore,
check each item in order given.
2.
Use LUV-P01 (Part No. 4-999-032-01) unless otherwise indicated.
3.
Use an oscilloscope with more than 10M
Ω
impedance.
4.
Clean the object lens by an applicator with neutral detergent when the
signal level is low than specified value with the following checks.
S-CURVE CHECK
Procedure :
1. Connect an oscilloscope to TP68 (FE) and TP73 (DVC) on the
BD board.
2. Turn the power ON.
3. Load a disc (LUV-P01) and actuate the focus search. (In
consequence of open and close the disc tray, actuate the focus
search)
4. Confirm that the oscilloscope waveform (S-curve) is
symmetrical between A and B. And confirm peak to peak level
within 2
±
0.5 Vp-p.
Note:
• Try to measure several times to make sure than the ratio
of A : B or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the
brightness to obtain best waveform.
Procedure :
1. Connect an oscilloscope CH1 to TP71 (RFDC), CH2 to TP72
(RFAC) and TP73 (DVC) on the BD board.
2. Turn the power ON.
3. Load a disc (LUV-P01) and playback the number nine track.
4. Confirm that oscilloscope waveform is clear and check if RF
signal level is correct or not.
level=1.2
±
0.55Vp-p
symmetry
A (DC voltage)
center of
waveform
B
DVC
1 track jump waveform
TP70 (TE)
TP73 (DVC)
BD board
+
–
oscilloscope
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
level : 0.75
±
0.1Vp-p (RFDC)
1.05
±
0.3Vp-p (RFAC)
+
–
symmetry
S-curve waveform
within 2
±
0.5Vp-p
A
B
+
–
oscilloscope
BD board
TP68 (FE)
TP73 (DVC)
CD SECTION
VIDEO SECTION
VIDEO LEVEL ADJUSTMENT
(AUDIO LEVEL/VIDEO CLOCK/AUDIO SERVO
CLOCK CHECK)
Procedure :
1. Connect an oscilloscope to TP308 (V-OUT) on the VIDEO
board.
2. Connect a level meter to TP415 (L-OUT) and TP413 (R-OUT)
on the VIDEO board.
3. Connect a frequency counter to TP70 (54 MHz) and TP182
(4.2336 MHz) on the VIDEO board.
3. Turn the power ON.
4. Set a test disc (HLV-402 (Part No. 8-909-870-00))
5. Press three buttons
x
,
[ENTER]
, and
[OPEN/CLOSE]
simultaneously.
6. The message “MPEG AV TEST” is displayed on the fluorescent
indicator tube. Color bar signal outputs and sine-wave (1 kHz
0dB) appears.
7. Adjust the RV501 on the VIDEO board for 0.714
±
0.05 Vp-p.
Note:
TP308 (V-OUT) on the VIDEO board must be teminated by 75
Ω
.
8. Confirm that the value of level meter is 2.5
±
2.0 dBs. (If audio
output disappear, press the
[PLAY MODE]
button twice)
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.
11. Change disc to a MP3 test disc (MP3 1kHz 0dB sine-wave is
recorded)
12. Confirm that the value of level meter is 2.4
±
2.0 dBs.
+
–
level meter
VIDEO board
TP415 (L-OUT)
TP413 (R-OUT)
VIDEO board
TP70 (54 MHz)
TP182 (4.2336 MHz)
+
–
frequency counter
VIDEO board
TP308 (V-OUT)
+
–
oscilloscope
0.714
±
0.05 Vp-p
Connecting and Adjustment Location:
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TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
