Read Sony CHC-P33D / HCD-H33D Service Manual online
– 16 –
6. After check, remove the lead wire connected in step 2.
Note :
•
Try to measure several times to make sure that the ratio
of A : B or B : A is more than 10 : 7.
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.
brightness to obtain best waveform.
Adjustment Location : BD board (see page 16)
RF Level Check
+
–
–
BD board
TP (RF)
TP (VC)
TP (VC)
oscilloscope
Procedure :
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in and press the
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in and press the
( button.
4. Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
Note :
Clear RF signal waveform means that the shape “≈” can be
clearly distinguished at the center of the waveform.
clearly distinguished at the center of the waveform.
•
RF signal waveform
Adjustment Location : BD board (see page 16)
E-F Balance Check
+
–
–
BD board
TP (TEO)
TP (VC)
TP (VC)
oscilloscope
Procedure :
1. Ground MAIN board IC101 (pin (£) with the lead wire.
2. Connect oscilloscope to test point TP (TEO) on BD board.
3. Turned Power switch on.
4. Put disc (YEDS-18) in and press the
1. Ground MAIN board IC101 (pin (£) with the lead wire.
2. Connect oscilloscope to test point TP (TEO) on BD board.
3. Turned Power switch on.
4. Put disc (YEDS-18) in and press the
( button.
5. Confirm that the oscilloscope waveform is symmetrical on the
top and bottom in relation to 0 Vdc, and check this level.
specified level :
•
——————
×
100 = less than ± 7%
•
A+B= 300 ± 100 mVp-p
6. Remove the lead wire connected in step 1.
Focus/Tracking Gain Adjustment (RV102, RV103)
This gain has a margin, so even if it is slightly off. There is no prob-
lem.
Therefore, do not perform, this adjustment.
Please note that it should be fixed to mechanical center position
when you moved and do not know original position.
lem.
Therefore, do not perform, this adjustment.
Please note that it should be fixed to mechanical center position
when you moved and do not know original position.
Adjustment Location :
[BD BOARD] – Side B –
A-B
2 (A + B)
RF
FOK
RV101
IC101
IC102
TE1
FE1
FEO
RV103
TEO
VC
RV102
PCK
GND
IC104
symmetry
within 2.4 ± 0.7 Vp-p
4. Put disc (YEDS-18) in and turned Power switch on again and
actuate the focus search. (actuate the focus search when disc
table is moving in and out.)
table is moving in and out.)
5. Check the oscilloscope waveform (S-curve) is symmetrical be-
tween A and B. And confirm peak to peak level within 2.4 ± 0.7
Vp-p.
Vp-p.
•
S-curve waveform
B
A
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
TIME/DIV: 500 ns
level:
1.3
1.3
±
0.3Vp-p
level: 300 ± 100 mVp-p
0 V
A
B
•
Traverse waveform
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