Adjustment; Measuring Instruments, Jigs And Tools; Power-Supply Voltage; Power Circuit Closure - NEC AccuSync LCD71VM Service Manual

4. Adjustment

4.1 Measuring Instruments, Jigs and Tools

The measuring instruments, jigs, and tools required at the time of the adjustment of the unit to be adjusted
are as specified below.
a. A signal generator that can generate an output of signal timing produced by the adjusted (*) VG-819 or
specified in [4. Setting method for the VG-819.] In this case, however, this signal generator should be
capable of displaying all white and all black as a screen display pattern.
* The word "adjusted" shall mean that the amplitude of each signal R, G, B, which is output from the signal
generator, is maintained at 0.7Vp-p ± 0.05V when a load of 75Ω is connected.

4.2 Power-supply Voltage

INPUT: 100Vac ~ 240Vac

4.3 Power Circuit Closure

1) Connect the suitable cable of the VG-819 according to the setting mode.
2) Turn on the Power switch of the VG-819.
3) Connect the AC power cable to the unit being adjusted.
4) Turn on the Power switch of the unit being adjusted.
5) After the completion of signal discrimination, the LED is turned green.

4.4 ADC Bias and Gain Adjust

1) Enter an input signal of 1280×1024 (75Hz), in 32-gray gradation.
2) Enter the factory mode according to "3.2 Hot key for Factory Adjust"
3) Press the (+) or (−) buttons several times to display the [AUTO CONTRAST] adjust menu.
4) Pressing the SELECT button, adjust the cursor to [AUTO]. When the AUTO/RESET button is pressed,
adjustment of the bias and the gain is carried out.
5) When adjustments have been finished, press the power switch OFF → ON to close the factory mode.
1 2 3 4
AU TO
GA IN R ED
GA IN GR EEN
GA IN BLUE
O FF S ET R ED
O FF S ET GR E EN
OFFSET BLUE
5 6 7
2 44
2 50
220
9 0
8 5
82
4-5