5-35
5. Contrast Adjustment (PD-117/118 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 Camera
Subject Arbitrary
Measurement Point Pin 3 of CN5502 (VG)
External trigger : Pin 4 of CN5502
(PANEL COM)
Measuring Instrument Oscilloscope
Adjustment Page D
Adjustment Address AA
Specified Value A=3.47 ± 0.07 Vp-p
(2.5 LCD TYPE S 61 k model)
A=3.34 ± 0.07 Vp-p
2.5 LCD TYPE S 123 k model
3/3.5/4 LCD TYPE S model
A=2.80 ± 0.07 Vp-p
(2.5 LCD TYPE C 61 k model)
A=3.00 ± 0.07 Vp-p
(3.5/4 LCD TYPE C model)
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: D, address: AA, change the data and set the voltage
(A) between the pedestal (0 IRE) and 100 IRE to the specified
value.
(The data of address: AA, should be “00” to “7F”)
3) Press the PAUSE button.
4) Select page: 0, address: 01, and set data: 00.
4. RGB AMP Adjustment (PD-117/118 board)
Set the D range of the RGB driver used to drive the LCD to the
specified value. If deviated, the LCD screen will become blackish
or saturated (whitish).
Mode Camera
Subject Arbitrary
Measurement Point Pin 3 of CN5502 (VG)
External trigger : Pin 4 of CN5502
(PANEL COM)
Measuring Instrument Oscilloscope
Adjustment Page D
Adjustment Address A5
Specified Value A=3.59 ± 0.05 Vp-p
(TYPE S model)
A=2.81 ± 0.05 Vp-p
(2.5 LCD TYPE C 61 k model)
A=3.20 ± 0.05 Vp-p
(3.5/4 LCD TYPE C model)
Adjusting method:
1) Select page: 0, address: 01, and set data: 01.
2) Select page: D, address: A5, change the data and set the voltage
(A) between the reversed waveform pedestal and non-reversed
waveform pedestal to the specified value.
(The data of address: A5, should be “00” to “3F”)
3) Press the PAUSE button.
4) Select page: 0, address: 01, and set data: 00.
Fig. 5-1-26
A
2H
100 IRE
Pedestal
Fig. 5-1-25
A
2H
Pedestal
Pedestal
Ver. 1.1 2001. 01
( )
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