Vco Adjustment (Pk-062 Board); D Range Adjustment (Pk-062 Board) - Sony DSC-P31M Service Manual

3. VCO Adjustment (PK-062 Board)

Set the VCO free-run frequency. If deviated, the LCD screen will
be blurred.
Mode PLAY
Signal Arbitrary
Measurement Point Pin 7 of CN903 (HSY)
Measuring Instrument Frequency counter
Adjustment Page A
Adjustment Address 82 (NTSC)
83 (PAL)
Specified Value T = 15734 ± 30 Hz (NTSC)
T = 15625 ± 30 Hz (PAL)
Menu setting:
1) VIDEO OUT of SET UP setting
.................................. NTSC (NTSC mode)
(This adjustment must be performed in NTSC mode, so don't
set the menu setting to "PAL" )
Adjusting method:
Order Page Address Data
1 0 01 01
2 4 F1 13
3 4 1D 82
4 A 82
5 A 82
6 A 83
7 A 83
Processing after Completing Adjustments:
Order Page Address Data
1 4 F1 00
2 4 1D 80
3 0 01 00
Procedure
(NTSC)
(PAL)
Change the data and set the
frequency (f) to the NTSC
specified value.
Press PAUSE button.
Change the data and set the
frequency (f) to the PAL
specified value.
Press PAUSE button.
Procedure
(NTSC)
(PAL)

4. D Range Adjustment (PK-062 Board)

Set the D Range of the RGB decoder for driving the LCD to the
specified value.
If deviated, the LCD screen image will be blackish or saturated
(whitish).
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Adjusting method:
Order Page Address Data
1 0 01
2 A 02
3 4 F1
4 A 85
5 A 85
Note: Adjust it between data 00 and 3F.
Processing after Completing Adjustments:
Order Page Address Data
1 A 02
2 4 F1
3 0 01
A
Pedestal
A: Pedestal level difference between 1H period and
previous 1H period.
5-35
DSC-P31/P31M
PLAY
Arbitrary
Pin 9 of CN903 (VG)
External trigger: Pin 8 of
CN903 (PANEL_COM)
Oscilloscope
A
85
A = 2.95 ± 0.05 Vp-p
Procedure
01
03 Press PAUSE button.
03
Change the data and set the
voltage (A) to the specified
value. (Note)
Press PAUSE button.
Procedure
00 Press PAUSE button.
00
00
Pedestal
2H
Fig. 5-1-18