Brightness Temporary Level Adjustment; Sharpness Adjustment; Contrast Adjustment; Color Adjustment - Sony XVM-R75 Service Manual

1-6. BRIGHTNESS TEMPORARY LEVEL
ADJUSTMENT
1. Display gray scale on the monitor screen.
2. Connect digital multimeter to pin wl of IC U600.
3. Adjust the semi-fixed VBRI so that the reading on the digital
voltmeter stands at the specified value.
Specified value: 2.06 ± 0.04 V

1-7. SHARPNESS ADJUSTMENT

1. Display gray scale on the monitor screen.
2. Connect digital voltmeter to pin rk of IC U600.
3. Adjust the semi-fixed VPIC so that the reading on the voltmeter
stands at the specified value.
Specified value: 2.59 ± 0.04 V

1-8. CONTRAST ADJUSTMENT

1. Display gray scale on the monitor screen.
2. Connect digital voltmeter to pin 2 of IC U600.
3. Adjust the semi-fixed VCNT so that the reading on the voltmeter
stands at the specified value.
Specified value: 1.25 ± 0.04 V

1-9. COLOR ADJUSTMENT

1. Display gray scale on the monitor screen.
2. Connect digital voltmeter to pin 6 of IC U600.
3. Adjust the semi-fixed VCOL so that the reading on the voltmeter
stands at the specified value.
Specified value: 2.58 ± 0.04 V

1-10. HUE ADJUSTMENT

1. Display gray scale on the monitor screen.
2. Connect digital voltmeter to pin qd of IC U600.
3. Adjust the semi-fixed VTIN so that the reading on the voltmeter
is at 3.18 ± 0.04 V.
1-11. γ 2 ADJUSTMENT
1. Display gray scale on the monitor screen.
2. Connect digital voltmeter to pin wh of IC U600.
3. Adjust the semi-fixed resistor VGA2 so that the reading on the
voltmeter is at 2.43 ± 0.04 V.
1-12. γ 0 ADJUSTMENT
1. Display gray scale on the monitor screen.
2. Connect digital voltmeter to pin wj of IC U600.
3. Adjust the semi-fixed resistor VGA1 so that the reading on the
voltmeter is at 1.40 ± 0.04 V.

1-13. RGB GAIN (1) ADJUSTMENT

1. Display gray scale on the monitor screen.
2. Connect digital voltmeter to pin wk of IC U600.
3. Adjust VRGB so that the reading on the voltmeter is at 2.05 ±
0.04 V.

1-14. RGB GAIN (2) ADJUSTMENT

1. Display 5-step gray scale on the monitor screen.
2. Connect oscilloscope to pin wa of IC U600.
3. Adjust the semi-fixed resistor VRGB so that the level of the signal
on the fifth step from the above stands at the specified value A.
Specified value A: 0.58 ± 0.04 V
4. Adjust the semi-fixed VGA1 so that the level of the signal on the
first step from the above stands at the specified value B.
Specified value B: 3.25 ± 0.04 V
5. Adjust the semi-fixed VBRI so that the level of the signal on the
fourth step from the above stands at the specified value C.
Specified value C: 1.47 ± 0.04 V
6. Repeat items 3 to 5 and adjust the levels of the signals on the
fifth, first and fourth steps to their specified values.

1-15. B AND R LEVEL ADJUSTMENTS

1. Display 5-step gray scale on the monitor screen.
2. Connect oscilloscope to pin wa specified as G_OUT of IC U600.
3. Measure the black-to-black level.
4. Connect oscilloscope to pin wf specified as B_OUT of IC U600.
5. Adjust VSUB so that the back-to-black level is equal to the level
measured in item 3.
6. Connect oscilloscope to pin ql specified as R_OUT of IC U600.
7. Adjust the semi-fixed resistor VSUR so that the back-to-black
level is equal to the level measured in item 3.

1-16. VCOM AMP ADJUSTMENT

1. Display gray scale on the monitor screen.
2. Connect oscilloscope to the Q701 emitter.
3. Adjust the semi-fixed resistor VCOM until the level A of the
output waveform stand at the specified value.
Specified value: 7.0 ± 0.04 V
XVM-R75
B
C
A
GND level
black-to-black level
A
3