Sony HCD-H11 Service Manual page 14

Adjustment Location
[TCB BOARD] – Conductor side –
RV41 :
MW Tuned indication
Lighting Level
CV2 :
SW Control Voltage
Adjustment
T2 :
SW Control Voltage
Adjustment
RV42 :
FW Tuned indication
Lighting Level
CV1 : SW Tracking Adjustment
T1 : SW Tracking Adjustment
D1
FE1
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 10MΩ impedance.
4. Clean an object lens by an applicator with neutral detergent when
the signal level is low than specified value with the following
checks.
Focus Bias Adjustment
This adjustment is to be done when the optical block is replaced.
Adjustment procedure :
BD board
TP (RF)
TP (VC)
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 ( 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.
7. After adjustment, remove the lead wire connecd in step 2.
RF signal reference waveform (eye pattern)
r
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
Adjustment Location : BD board. (see page 15)
S-Curve Check
BD board
TP (FEO)
TP (VC)
Procedure :
1. Connect oscilloscope to test point TP (FEO) and BD board.
2. Connect between test point TP (FOK) and TP (GND) by lead wire.
3. Turned Power switch on.
– 14 –
oscilloscope
(DC range)
+
–
VOLT/DIV : 0.2V
TIME/DIV : 500ns
1.3 ± 0.3Vp-p
oscilloscope
+
–