Vco Adjustment (Pd-143 Board); Rgb Amp Adjustment (Pd-143 Board) - Sony DCR-TRV15E Service Manual

2. VCO Adjustment (PD-143 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 D
Adjustment Address A2, A3
Specified Value f = 15625 ± 30Hz
Note1: Refer to "LCD Type Check" for the discrimination of the LCD
type.
Adjusting method:
Order Page Address Data
1 0 01 01
2 D A2
3 D A2
4 D A2
5
6
7
8 D A3 D
A3
9 0 01 00
Note2: 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 .
A2
Convert D to decimal notation,
A2
and obtain D '. (Note2)
A2
Calculate D ' using following
A3
equations (Decimal calculation)
[2.5 LCD TYPE]
When D ' 25
A2
D ' =D '–25
A3 A2
When D ' < 25
A2
D ' = 0
A3
[3.5 LCD TYPE]
When D ' 9
A2
D ' =D '–9
A3 A2
When D ' < 9
A2
D ' = 0
A3
Convert D ' to a hexadecimal
A3
number, and obtain D . (Note2)
A3
Set the data, and press PAUSE
button.
Set the data.

3. RGB AMP Adjustment (PD-143 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
Note: Refer to "LCD Type Check" for the discrimination of the LCD type.
Adjusting method:
Order Page Address Data
1 0 01
2 D A5
3 D A5
4 0 01
A
Pedestal
5-31
VTR stop
No signal
Pin 3 of CN5502 (PANEL VG)
External trigger: Pin 4 of CN5502
(PANEL COM)
Oscilloscope
D
A5
A = 3.59 ± 0.05V (LCD TYPE S)
A = 3.20 ± 0.05V (LCD TYPE C)
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. 5-1-17.