Sharp XV-Z1A Service Manual page 25

Step
Adjustment Position
17 Gamma
(DAC)
18 SID signal level
Adjustment Conditions
1. Receive the 10 step gray
scale signal of NTSC.
2. Connect the oscilloscope to
pin (2) of P4303.
3. Push S2001 and set the fol-
low DAC mode.
Group : VIDEO 4
Subject : RGB GAM 1
RGB CTR 1
4. Connect the oscilloscope to
pin (1) of P4303.
Group : VIDEO 4
Subject : R GAM 1
R CTR 1
5. Connect the oscilloscope to
pin (3) of P4303.
Group : VIDEO 4
Subject : B GAM 1
B CTR 1
1. Receive the 10 step gray
scale signal of NTSC.
2. Connect the oscilloscope to
pin (6) of P4303.
3. Push S2001 and set the fol-
low DAC mode.
Group : VIDEO 3
Subject : SID CTR
Adjustment Method
» Using the Operation key switch
tween 2nd gradation and GND for
4.4 ±0.1Vp-p
adjust level between black level and GND for
3.0 ±0.1Vp-p
2nd gradation
Black level
4.4V
3.0V
GND
» Using the Operation key switch
tween signal center and SID signal level.
4.0 ±0.1Vp-p
4.0V
4.0V
25
XV-Z1E/A
' " , adjust level be-
' " , adjust level be-