Sony DCR-TRV738E Service Manual page 99

1-5-2. LCD SYSTEM ADJUSTMENT (PD-156 board)
1. VCO Adjustment (PD-156 board)
Set the VCO free-run frequency. If deviated, the LCD screen will
be blurred.
Mode VTR stop
Signal No signal
Measurement Point Pin 8 of CN5502 (XHD OUT)
Measuring Instrument Frequency counter
Adjustment Page C
Adjustment Address 61, 62
Specified Value f = 15734 ± 30Hz (NTSC)
f = 15625 ± 30Hz (PAL)
Note1: NTSC model: DCR-TRV840
PAL model: DCR-TRV738E/TRV740E
Note2: Refer to "LCD Type Check" for the discrimination of the LCD
type.
Note3: The data of page: 0, address: 10 must be "00".
Adjusting method:
Order Page Address Data
1 0 01 01
2 C 61
3 C 61
4 C 61
5
6
7
8 C 62 D
62
9 0 01 00
Note4: Refer to "Table 5-4-1. Hexadecimal-decimal Conversion Table".
Procedure
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 3.5 LCD TYPE CA]
When D ' 252
61
D '=D '+3
62 61
When D '>252
61
D '=255
62
[PAL 2.5 LCD TYPE SH]
When D ' 20
61
D '=D '–20
62 61
When D '< 20
61
D '=0
62
Convert D ' to a hexadecimal
62
number, and obtain D . (Note4)
62
Set the data, and press PAUSE
button.
Set the data.
DCR-TRV738E/TRV740/TRV740E/TRV840
2. RGB AMP Adjustment (PD-156 board)
Set the D range of the RGB decoder used to drive the LCD to the
specified value. If deviated, the LCD screen will become blackish
or saturated (whitish).
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note1: NTSC model: DCR-TRV840
PAL model: DCR-TRV738E/TRV740E
Note2: Refer to "LCD Type Check" for the discrimination of the LCD
type.
Note3: The data of page: 0, address: 10 must be "00".
Adjusting method:
Order Page Address Data
1 0 01
2 C 64
3 C 64
4 0 01
A
Pedestal
5-33
VTR stop
No signal
Pin 3 of CN5502 (VG)
Ext. trigger: Pin 4 of CN5502
(PANEL COM)
Oscilloscope
C
64
NTSC 3.5 LCD TYPE CA:
A = 3.22 ± 0.05V
PAL 2.5 LCD TYPE SH:
A = 3.55 ± 0.05V
Procedure
01 Set the data.
Change the data and set the voltage
(A) between the reversed waveform
pedestal and non-reversed waveform
pedestal to the specified value.
(The data should be "00" to "3F".)
Press PAUSE button.
00 Set the data.
Pedestal
2H
Fig. 5-1-16.