Sony CCD-TRV32 Service Manual page 165

20-4. CONTRAST adjustment
Purpose : Adjusts contrast of LCD picture
Adjustment Error : Details of black will be lost, or white
saturated/black compressed picture.
Mode Playback
Signal Color bar signal with chroma and
burst signals turned OFF.
CN804 〈CN1804〉 pin 2 (VG)
Measurement point
Measuring equipment Oscilloscope
[External trigger : CN804 〈CN1804〉
pin 4 (HDB) 〈HSY〉]
Adjustment page F
Adjustment address DD
Type 1 : A=2.00 ± 0.05Vp-p (PAL)
Specification
Type 2 : A=3.30 ± 0.05Vp-p (PAL)
Type 3 : A=3.45 ± 0.05Vp-p (NTSC)
Type 4 : A=2.87 ± 0.05Vp-p
Adjustment procedure:
Order Page Address
1 6 00
2 F DD
3
4 6 00
Related Adjustment:
BRIGHT adjustment
NTSC MODEL
2H
(NTSC/PAL)
Data
01 After setting the data, press the PAUSE button. (Preparation)
Change data using the PLAY and STOP buttons until the amplitude (A) has the
specification value.
Press the PAUSE button.
00 After setting the data, press the PAUSE button. (End)
White (100%)
A
Pedestal level
LCD size
Type 1
2.5 inch (PAL only)
Type 2
Type 3
3.0 inch (NTSC)
Type 4
3.5 inch (NTSC/PAL)
No mark : Type 1, Type 4
〈 〉 : Type 2, Type 3
Note 1 : Set the BRIGHT control volume to their mechanical
center during adjustment.
(Center is the 17 clicks from the BRI MIN.)
Note 2 : This adjustment must be performed together with the
BRIGHT adjustment as the pair adjustment.
(Re-adjust them when they are out of specifications.)
Procedure
PAL MODEL
2H
6-36
LCD board
PD-74/SD-24
PD-75/SD-25
PD-77
PD-76
White (100%)
A
Pedestal level