Sony DCR-TRV240 Service Manual page 130

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: Before performing the adjustments, check the data of page: 0,
address: 10 is "00". If not, set data: 00 to this address.
Note 4: Set the LCD BRIGHT (Menu display) to the center.
Set the LCD COLOR (Menu display) to the center.
[Adjusting connector]
Most of the measuring points for adjusting the LCD system are
concentrated in CN5502 of the PD-160 board. Connect the
measuring instruments via the multi CPC jig (J-6082-311-A). The
following table shows the Pin No. and signal name of CN5502.
Pin No. Signal Name
1 VB
3 VG
5 VR
7 XHD
9 GND
Table 5-1-15.
PD-160 board
CN5502
9 10
2
1
Pin No. Signal Name
2 XVD OUT
4 PSIG
6 MAKER CHECK
8 XHD OUT
10 GND
1. VCO Adjustment (PD-160 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
Note1: The data of page: 0, address: 10 must be "00".
Adjusting method:
Order Page Address Data
1 0 01
2 C 61
3 C 61
4 C 61
5
6
7
8 C 62
9 0 01
Note2: Refer to "Table 5-4-1. Hexadecimal-decimal Conversion Table".
5-29
DCR-TRV240/TRV340
VTR stop
No signal
Pin 8 of CN5502 (HSY)
Frequency counter
C
61, 62
f = 15734 ± 30Hz
Procedure
01 Set the data.
Change the data and set the VCO
frequency (f) to the specified
value.
Press PAUSE button.
Read the data, and this data is
named D .
61
Convert D to decimal notation,
61
and obtain D '. (Note2)
61
Calculate D ' using following
62
equations (Decimal calculation)
When D ' 238
61
D ' = D '+ 17
62 61
When D ' > 238
61
D ' = 255
62
Convert D ' to a hexadecimal
62
number, and obtain D . (Note2)
62
D Set the data, and press PAUSE
62
button.
00 Set the data.