D Range Adjustment (Pk-50 Board); Bright Adjustment (Pk-50 Board) - Sony MVC-FD85 Service Manual

3. D Range Adjustment (PK-50 board)

Set the D range of the LCD driver to the specified value. If deviated,
the LCD screen will become 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 D5
Specified Value LCD TYPE SH: A = 3.62 ± 0.05V
LCD TYPE CA: A = 2.50 ± 0.05V
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: D5, 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. 5-1-16.
Pedestal
2H

4. Bright Adjustment (PK-50 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: 2, address: 10, set data: 01.
4) Select page: D, address: D0, change the data and set the voltage
(A) between the pedestal and GAMMA1 limiter level to the
specified value.
5) Press the PAUSE button of the adjustment remote commander.
6) Select page: 2, address: 10, set data: 00.
7) Select page: 5, address: F1, set data: 00.
8) Select page: 0, address: 01, and set data: 00.
GAMMA 1 limiter level
A
Pedestal
5-29
PLAY
Arbitrary
Pin 9 of CN803 of FC-72 board
(VG)
External trigger: Pin 8 of CN803 of
FC-72 board (COM)
Oscilloscope
D
D0
LCD TYPE SH: A = 2.00 ± 0.05V
LCD TYPE CA: A = 1.32 ± 0.05V
2H
Fig. 5-1-17.