Sony DCR-TRV738E Service Manual page 102

DCR-TRV738E/TRV740/TRV740E/TRV840
1-5-3. LCD SYSTEM ADJUSTMENT (PD-160 board)
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: NTSC model: DCR-TRV740/TRV840
PAL model: DCR-TRV740E
Note2: 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 D
9 0 01
Note3: Refer to "Table 5-4-1. Hexadecimal-decimal Conversion Table".
VTR stop
No signal
Pin 8 of CN5502 (XHD OUT)
Frequency counter
C
61, 62
f = 15734 ± 30Hz (NTSC)
f = 15625 ± 30Hz (PAL)
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)
[NTSC 2.5 LCD]
When D ' 238
61
D '= D '+17
62 61
When D '> 238
61
D '= 255
62
[NTSC 3.5 LCD]
When D ' 247
61
D '=D '+8
62 61
When D '> 247
61
D '= 255
62
[PAL 2.5 LCD]
When D ' 17
61
D '=D '–17
62 61
When D '< 17
61
D '= 0
62
Convert D ' to a hexadecimal
62
number, and obtain D . (Note3)
62
Set the data, and press PAUSE
62
button.
00 Set the data.
2. PSIG Gray Adjustment (PD-160 board)
Set the uniformity improvement signal to an appropriate level.
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note: The data of page: 0, address: 10 must be "00".
Adjusting method:
Order Page Address Data
1 0 01
2 C 66
3 C 66
4 0 01
5-36
VTR stop
No signal
Pin 4 of CN5502 (PSIG)
Oscilloscope
C
66
A = 5.00 ± 0.1V
Procedure
01 Set the data.
Change the data and set the PSIG
signal level (A) to the specified
value.
(The data should be "00" to "7F")
Press PAUSE button.
00 Set the data.
2H
Fig. 5-1-20.
A