Bright Adjustment (Pk-45 Board); Contrast Adjustment (Pk-45 Board) - Sony MVC-FD91 Service Manual

4. Bright Adjustment (PK-45 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 Playback
Signal Alignment disk (TFD2-1(+) or TFD2-
2(–)):
Stair step signal of 10 steps (MVC-
006T.JPG)
Pin 9 of CN701 (VG)
Measurement Point
External trigger: Pin 8 of CN701
(COM)
Measuring Instrument Oscilloscope
Adjustment Page F
Adjustment Address 30
Specified Value A = 2.00 ± 0.05V
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: 3, address: 02, and set data: 01.
3) Select page: 3, address: 19, and set data: 08.
4) Select page: F, address: 30, change the data and set the voltage
(A) between the pedestal and white level to the specified value.
5) Press the PAUSE button of the adjustment remote commander.
6) Select page: 3, address: 02, and set data: 00.
7) Select page: 3, address: 19, and set data: 00.
8) Select page: 0, address: 01, and set data: 00.
White
A
Pedestal
Fig. 5-1-21.
2H

5. Contrast Adjustment (PK-45 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
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: 3, address: 02, and set data: 01.
3) Select page: F, address: 34, change the data and set the voltage
(A) between the 0 IRE (pedestal) and 100 IRE to the specified
value.
4) Press the PAUSE button of the adjustment remote commander.
5) Select page: 3, address: 02, and set data: 00.
6) Select page: 0, address: 01, and set data: 00.
A
0 IRE
5-26
Playback
Alignment disk (TFD2-1(+) or TFD2-
2(–)):
Stair step signal of 10 steps (MVC-
006T.JPG)
Pin 9 of CN701 (VG)
External trigger: Pin 8 of CN701
(COM)
Oscilloscope
F
34
A = 3.05 ± 0.07V
100 IRE
2H
Fig. 5-1-22.