ViewSonic A91f+-1, Service Manual

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A
﹒
GENERAL
﹒
1. All specification must be met over line voltage range of 90vac to 264VAC 50Hz / 60Hz, unless otherwise
specified
﹒
2. Operating temperature range is 0
℃
to 40
℃
with a relative humidity of 10% or less to 90%
﹒
3. The monitor must be operational in a usable state within 30 minutes after turn-on
﹒
4. All signal levels are measured assuming termination at the monitor’s input jacks or in its characteristic
impedance
﹒
5. An ambient lighting level of 400 to 600 Lux is assumed when setting brightness for raster extinction threshold
﹒
6. All purity related specifications must be met without external degaussing
﹒
7. All controls must have excess range
（
no control may be left at an end stop when proper alignment is
completed.
8. 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 or noisy inputs while at any possible settings of user accessible controls likewise, the
monitor should survive extended periods of operation with line voltage reduced below the specified minimum.
9. 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
﹒
10. Discharge of CRT anode should be done only to CRT ground strap
﹒
11. Geometric measurements assumed to be made along a straight surface with a flat rule or template
﹒
5. Adjusting Procedure
34
ViewSonic Corporation
Co
nfidential - Do Not Copy A91f+-1