Read Sony CHC-P33D / HCD-H33D Service Manual online
– 15 –
Adjustment Location
[TCB BOARD] – Component side –
CD SECTION
Note :
1. CD Block basically constructed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use the oscilloscope with more than 10M
3. Use the oscilloscope with more than 10M
Ω
impedance.
4. Clean an object lens by an applicatior with neutral detergent
when the signal level is low than specified value with the fol-
lowing checks.
lowing checks.
Focus Bias Adjustment
This adjustment is to be done when the optical block is replaced.
Adjustment procedure :
1. Connect oscilloscope to test point TP (VC) and TP (RF) on BD
board.
2. Ground main board IC101 (pin (£) with the lead wire.
3. Turned power switch ON. (Stop mode)
4. Put disc (YEDS-18) in and press the
3. Turned power switch ON. (Stop mode)
4. Put disc (YEDS-18) in and press the
( button.
5. Press the
P button. (Tracking servo ON)
6. Adjust RV101 so that the oscilloscope waveform is as shown in
the figure below (eye pattern).
A good eye pattern means that the diamond shape (≈) in the
center of the waveform can be clearly distinguished.
A good eye pattern means that the diamond shape (≈) in the
center of the waveform can be clearly distinguished.
7. After adjustment, remove the lead wire connecd in step 2.
•
RF signal reference waveform (eye pattern)
When observing the eye pattern, set the oscilloscope for AC
range and raise vertical sensitivity.
range and raise vertical sensitivity.
Adjustment Location : BD board (see page 16)
S-Curve Check
Procedure :
1. Connect oscilloscope to test point TP (FEO) on BD board.
2. Connect between test point TP (FOK) and TP (GND) by lead
1. Connect oscilloscope to test point TP (FEO) on BD board.
2. Connect between test point TP (FOK) and TP (GND) by lead
wire.
3. Turned Power switch on.
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
TIME/DIV: 500 ns
1.3
±
0.3 Vp-p
+
–
–
BD board
TP (FEO)
TP (VC)
TP (VC)
oscilloscope
+
–
–
BD board
TP (RF)
TP (VC)
TP (VC)
oscilloscope
(DC range)
FE1
D1
CV1: SW Tracking Adjustmnet
T1: SW Tracking Adjustment
RV41:
AM Tuned Level
Adjustment
AM Tuned Level
Adjustment
CV2:
SW OSC voltage
Adjustment
SW OSC voltage
Adjustment
T2:
SW OSC voltage
Adjustment
SW OSC voltage
Adjustment
RV42:
FM Tuned Level
Adjustment
FM Tuned Level
Adjustment
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