Bright Adjustment (Pk-52 Board); Contrast Adjustment (Pk-52 Board) - Sony MVC-FD85 Service Manual

4. Bright Adjustment (PK-52 board)

Set the level of the VIDEO signal for driving the LCD to the specified
value. If deviated, the screen image will be blackish or saturated
(whitish).
Mode PLAY
Signal Arbitrary
Measurement Point Pin 9 of CN803 of FC-72 board
(VG)
External trigger: Pin 8 of CN803 of
FC-72 board (COM)
Measuring Instrument Oscilloscope
Adjustment Page D
Adjustment Address D0
Specified Value LCD TYPE SA: A = 7.0 ± 0.1 V
LCD TYPE ST: A = 7.5 ± 0.1 V
Note: Refer to "1-5-1. LCD type check" for the discrimination of the LCD
type.
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: 5, address: F1, set data: 03.
3) Select page: D, address: D0, change the data and set the voltage
(A) between the reversed waveform pedestal and non-reversed
waveform pedestal to the specified value.
4) Press the PAUSE button of the adjustment remote commander.
5) Select page: 5, address: F1, set data: 00.
6) Select page: 0, address: 01, and set data: 00.
A
Pedestal
Fig. 5-1-24.
Pedestal
2H

5. Contrast Adjustment (PK-52 board)

Set the level of the VIDEO signal for driving the LCD to the specified
value. If deviated, the screen image will be blackish or saturated
(whitish).
Mode
Signal
Measurement Point
Measuring Instrument
Adjustment Page
Adjustment Address
Specified Value
Note: Refer to "1-5-1. LCD type check" for the discrimination of the LCD
type.
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: 5, address: F1, set data: 03.
3) Select page: D, address: D4, change the data and set the voltage
(A) between the 10 steps peak and pedestal to the specified
value.
4) Press the PAUSE button of the adjustment remote commander.
5) Select page: 5, address: F1, set data: 00.
6) Select page: 0, address: 01, and set data: 00.
10 steps peak
A
Pedestal
5-34
PLAY
Arbitrary
Pin 9 of CN803 of FC-72 board
(VG)
External trigger: Pin 8 of CN803 of
FC-72 board (COM)
Oscilloscope
D
D4
LCD TYPE SA: A = 2.30 ± 0.05 V
LCD TYPE ST: A = 2.30 ± 0.05 V
2H
Fig. 5-1-25.