Sony DVCAM DSR-PD150, Service Manual

Page: 178 / 279

5-34
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.
[Adjusting connector]
Most of the measuring points for adjusting the LCD system are
concentrated in CN2105 of the PD-126 board. The following table
shows the Pin No. and signal name of CN2105.
Table 5-1-9.
1. VCO Adjustment (PD-126 board)
Set the VCO free-run frequency. If deviated, the LCD screen will
be blurred.
Mode VTR stop
Signal No signal
Measurement Point Pin
5
of CN2105 (HSY)
Measuring Instrument Frequency counter
Adjustment Page D
Adjustment Address A2, A3
Specified Value f = 15734 ± 30Hz (NTSC)
f = 15625 ± 30Hz (PAL)
Note1:
NTSC: DSR-PD150
PAL: DSR-PD150P
Adjusting method:
Order Page Address Data Procedure
1 0 01 01 Set the data.
2 D A2 Change the data and set the
VCO frequency (f) to the
specified value.
3 D A2 Press PAUSE button.
4 D A2 Read the data, and this data is
named D
A2
.
5 Convert D
A2
to decimal notation,
and obtain D
A2
'. (Note2)
6 Calculate D
A3
' using following
equations (Decimal calculation)
NTSC model:
When D
A2
' 221
D
A3
' = D
A2
' + 34
When D
A2
' > 221
D
A3
' = 255
PAL model:
When D
A2
' 34
D
A3
' = D
A2
' – 34
When D
A2
' < 34
D
A3
' = 00
7 Convert D
A3
' to a hexadecimal
number, and obtain D
A3
. (Note2)
8 D A3 D
A3
Set the data, and press PAUSE
button.
9 0 01 00 Set the data.
Note2: Refer to “Table 5-4-1. Hexadecimal-decimal Conversion Table”.
Pin No.
1
2
3
4
5
Signal Name
VG
COM
GND
PSIG
HSY
PD-126 board
CN2105
1 5
Fig. 5-1-21.