Sony CCD-TRV312 Operating Instructions (primary manual), Service Manual, Page: 164 / 212

6-35
20-3. BRIGHT adjustment
Purpose : Adjusts video signal level to drive the LCD
panel.
Adjustment Error : Picture on LCD will be white saturated or black
compressed.
Mode Playback
Signal Color bar signal with the chroma and
burst signals turned OFF.
Measurement point CN804
〈
CN1804
〉
pin
2
(VG)
Measuring equipment Oscilloscope
[External trigger : CN804
〈
CN1804
〉
pin
!¡
(HDB)]
Adjustment page F
Adjustment address D8
Specification Type 1 : A=1.50
±
0.05Vp-p
Type 2 : A=0.50
±
0.05Vp-p
Type 3 : A=0.47
±
0.05Vp-p
Type 4 : A=2.44
±
0.05Vp-p
Adjustment procedure:
Related Adjustment:
CONTRAST adjustment
Order Page Address Data Procedure
1 6 00 01 After setting the data, press the PAUSE button. (Preparation)
2 F D8 Change data using the PLAY and STOP buttons until the VG signal amplitude (A) has
the specification value.
3 Press the PAUSE button.
4 6 00 00 After setting the data, press the PAUSE button. (End)
NTSC MODEL (TYPE 4 only) PAL MODEL (TYPE 1, 4)
2H
2H 2H
Pedestal level of
inverted waveform
Amplitude level A
Pedestal level of
non-inverted
waveform
2H
2H 2H
Pedestal level of
inverted waveform
Amplitude level A
Pedestal level of
non-inverted
waveform
Note 1 : Adjustment procedure of TYPEs 2 and 3 machines
are as follows :
D.RANGE (item 20-5)
→
BRIGHT (item 20-3)
→
CONTRAST (item 20-4)
Note 2 : The adjustment points of the TYPEs 2 and 3 machines
are as follows :
Note 3 :
This adjustment must be performed together with the
CONTRAST adjustment as the pair adjustment.
(Re-adjust them when they are out of specifications.)
Type 1
Type 2
Type 3
Type 4
LCD size
2.5 inch (PAL only)
3.0 inch (NTSC)
3.5 inch (NTSC/PAL)
LCD board
PD-74/SD-24
PD-75/SD-25
PD-77
PD-76
No mark : Type 1, Type 4
〈 〉
: Type 2, Type 3
NTSC MODEL (TYPE 3 only) PAL MODEL (TYPE 2 only)
2H
2H 2H
Pedestal level
(peak to peak)
of blue signal
Blue
A
2H
2H 2H
Pedestal level
(peak to peak)
of blue signal
Blue
A