ViewSonic E95 - Page 55

General
1.
10.
11.
All specification must be met over line voltage range of 90OVAC to 264VAC 50Hz/60Hz unless other wise
specified.
Operating temperature range is 0 DEG.C to 40DEG. C with a relative humidity of 10% or less to 95%.
The monitor must be operational in an unstable state within 30 section after turn-on.
All signal levels are measured assuming termination at the monitor’s input jacks or in its characteristic impedance.
An ambient lighting level of 400 to 600 LUX is assumed when setting brightness for raster extinction threshold.
All purity related specifications must be met without external degaussing.
All controls must have excess range (No control may be left at an end stop when proper alignment is completed).
The monitor is not required to meet specs during the following but must tolerate, without damage to the CRT or
circuits, Any sequence or combination of power on and off, signal on and off, unplugging of power or signal,
erratic, Wrong frequency of inputs while at any possible settings of user accessible controls noisy
An isolation transformer should be used when performing alignment and tests. Portions of the power supply board
are hot ground The remaining boards are cold ground
Discharge of CRT anode should be done only to CRT ground strap.
Geometric measurement are assumed to be made alone a straight surface with a flat rule or template.
A. Instrument alignment
1.
Deflection presets
1.1 Control pots (VR201, VR401, VR402, VR403 ) are set at middle point. screen VR set to MIN.
Power supply alignment
2.1 Input VESA 1024x768 / 75Hz mode & cross-hatch pattern.
2.2 Adjust VR201 until voltage at TP201=198V+ 0.2V.
Extreme high voltage alignment
3.1 Input VESA640x480 31.5KHz/60Hz mode & cross-hatch pattern.
3.2 Contrast 100%, brightness 50%.
Adjust VR402 let H.V=26 + 0.1KV (E95-1)
Adjust screen (G2 knob)let G2 = 540 + 10VDC.(E95-1).
Set focus (G3 / G5 knob) to be distinguish.
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