Lcd System Adjustment; Vco Adjustment (Pd-125 Board) - Sony DCR-PC100 Service Manual

1-5.

LCD SYSTEM ADJUSTMENT

Note 1: The back light (fluorescent tube) is driven by a high voltage AC
power supply. Therefore, do not touch the back light holder to
avoid electrical shock.
Note 2: When replacing the LCD unit, be careful to prevent damages
caused by static electricity.
Note 3: Set the function settings of the touch panel as follow.
PANEL BRIGHT (Menu setting) ..................................... Center
PANEL COLOR (Menu setting) ....................................... Center
[Adjusting connector]
Most of the measuring points for adjusting the LCD system are
concentrated in CN8201 of the PD-125 board.
The following table shows the Pin No. and signal name of CN8201.
Pin No. Signal Name
1 VG
2 COM
3 GND
4 PSIG
5 VCO CENT
Table 5-1-8
PD-125 board
5
CN8201
Fig. 5-1-17
1

1. VCO Adjustment (PD-125 board)

Set the VCO free-run frequency. If deviated, the LCD screen will
be blurred.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Check the GND level of the oscilloscope.
3) Select page: D, address: 84, change the data and set the PCO
output voltage (A) to the specified value.
4) Press the PAUSE button.
5) Select page: 0, address: 01, and set data: 00.
H
5-33
VTR stop
No signal
Pin 5 of CN8201 (VCO CENT)
Oscilloscope (DC range)
D
84
A = 1.8 ± 0.1V
A
GND level
(0Vdc)
Fig. 5-1-18