Sony FD Mavica MVC-FD75, Service Manual

Page: 69 / 90

5-18
3. D Range Adjustment (PK-59 Board)
This adjustment sets correctly the D range of the LCD driver.
If disordered, the LCD screen will blur or white 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 38
Specified Value A=3.20 ± 0.05 Vp-p
Adjusting method:
Order Page Address Data Procedure
1 0 01 01
2 3 02 01
3 F 38 Change the data and set the
voltage (A) to the specified
value.
4 F 38 Press PAUSE button.
Processing after Completing Adjustment:
Order Page Address Data Procedure
1 3 02 00
2 0 01 00
4. Bright 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 30
Specified Value A=1.34 ± 0.05 Vp-p
Note: This is the tracking adjustment in relation to “Contrast
Adjustment”.
Adjusting method:
Order Page Address Data Procedure
1 0 01 01
2 3 02 01
3 3 18 08 Press PAUSE button.
4 F 30 Change the data and set the
voltage (A) to the specified
value. (Check that the data is
41 to BF)
5 F 30 Press PAUSE button.
Processing after Completing Adjustment:
Order Page Address Data Procedure
1 3 18 00 Press PAUSE button.
2 3 02 00
3 0 01 00
Note: Check that the adjustment value of “Contrast Adjustment”
is satisfied.
If not satisfied, perform “Contrast Adjustment”.
2H
A
Pedestal
Pedestal
A: Between the reversed waveform
pedestal and non-reversed waveform pedestal
2H
A
Pedestal
GAMMA 1
limiter level
A: Between the pedestal and GAMMA 1
limiter level
Fig. 5-1-15
Fig. 5-1-16