Sony HCD-VX333 Service Manual page 18

HCD-VX333
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3 7 63 1515 0
Note : Clear RF signal waveform means that the shape " ◊ " can be clearly
distinguished at the center of the waveform.
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
E-F Balance (1 Track jump) Check
oscilloscope
BD board
TP(TE0)
TP(VC)
Procedure :
1. Connect oscilloscope to TP (TE0) and TP (VC).
2. Turned Power switch on.
3. Load a disc (YEDS-18) and playback the number five track.
4. Press the gG button. (Becomes the 1 track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscilloscope
waveform.
1 track jump waveform
0V
TE
L 13942296513
level=1.3±0.6Vp-p
A
Specified level: –– × 100=less than ±22%
B
6. After check, remove the lead wire connected in step 1.
Adjustment Location : BD board
[BD BOARD] (Conductor Side)
TP (RF)
TP (VC)
TP (AGCCOM)
TP (TE0)
TP (FE0)
IC103
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level : 1.45 ± 0.3Vp-p
center of
waveform
B
A (DC voltage)
symmetry
TP (DGND)
IC101
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8
VIDEO CD SECTION
Frequency Adjustment
Connection:
VIDEO board
(27 MHz)
Procedure:
1. Connect the frequency counter to check point of the VIDEO
board.
2. Turned power switch on.
3. Press the CD button to select the CD.
4. Adjust CT503 on the VIDEO board so that the frequency counter
reading 27.0 MHz ± 80 Hz at stop status.
Adjustment Location : VIDEO CD board
[VIDEO CD BOARD] (Component Side)
J301
Q Q
3 6 7 1 3
CN501
CN502
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2 9 9 4 2 8
frequency counter
CN301
1 5 0 5 8 IC507 2 9 9 4
(GND)
CT503
(27MHz)
VIDEO
Frequency
Adjustment
CN503
m
co
9 9
2 8 9 9