Sony FD Mavica MVC-FD75, Service Manual

Page: 70 / 90

5-19
5. Contrast Adjustment (PK-59 Board)
This adjustment sets correctly the VIDEO signal level that drives
the LCD. If disordered, the LCD screen will not be sharp, or will
white blur or black blur.
Mode PLAY
Signal Alignment disk: Stair-step signal
of 10 steps
Measurement Point Pin
9
of CN802 (VG)
External trigger: Pin
8
of
CN802 (COM)
Measuring Instrument Oscilloscope
Adjustment Page F
Adjustment Address 35
Specified Value A=3.09 ± 0.07 Vp-p
Note: This is the tracking adjustment in relation to “Bright
Adjustment”.
Adjusting method:
Order Page Address Data Procedure
1 0 01 01
2 3 02 01
3 F 35 Change the data and set the
voltage (A) to the specified
value.
4 F 35 Press PAUSE button.
Processing after Completing Adjustment:
Order Page Address Data Procedure
1 3 02 00
2 0 01 00
Note:
Check that the adjustment value of “Bright Adjustment” is
satisfied.
If not satisfied, perform “Bright Adjustment”.
6. V-COM Level Adjustment (PK-59 Board)
This adjustment sets correctly the common electrode drive signal
level of the LCD panel.
Mode PLAY
Signal Alignment disk: Stair-step signal
of 10 steps
Measurement Point CN802
8
pin (COM)
Measuring Instrument Oscilloscope
Adjustment Page F
Adjustment Address 39
Specified Value A=6.16 ± 0.05 Vp-p
Note: “Contrast Adjustment” and “Bright Adjustment” must be
already finished.
Adjusting method:
Order Page Address Data Procedure
1 0 01 01
2 3 02 01
3 F 39 Change the data and set the
voltage (A) to the specified
value.
4 F 39 Press PAUSE button.
Processing after Completing Adjustment:
Order Page Address Data Procedure
1 3 02 00
2 0 01 00
2H
A
0 IRE (Pedestal)
100 IRE
A: Between the pedestal and 100 IRE
2H
A
Fig. 5-1-17
Fig. 5-1-18