Sony CCD-TRV312 Operating Instructions (primary manual), Service Manual, Page: 167 / 212

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21-6. V-COM level adjustment (Type 2, 3 MODEL)
Purpose : Set to contrast of the image.
Adjustment Error : Image will be blue (whitish) or saturated.
Mode STOP or Playback
Signal Color bar signal with chroma and
burst signals turned OFF
Measurement point
〈
CN1804
〉
pin
8
(COM-O)
Measuring equipment Oscilloscope
Adjustment page F
Adjustment address E1
Specification Type 2 : A=6.60
±
0.05Vp-p
Type 3 : A=6.85
±
0.05Vp-p
Adjustment procedure:
Order Page Address Data Procedure
1 6 00 01 After setting the data, press the PAUSE button. (Preparation)
2 F E1 Change the data of page : F, address : E1, and adjust the V-COM level (A) to the specified
value.
3 Press the PAUSE button.
4 6 00 00 After setting the data, press the PAUSE button. (End)
2H
A
Note 1 : Set the BRIGHT control volume to their mechanical
center during adjustment.
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