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ViewSonic Corporation
E771-4
S
Alignments and Adjustments
This section of the service manual explains how to make permanent adjustments to the monitor settings.
5-1. General Adjustments
5-1-1 Adjustment Conditions
a) Power Supply
Apply AC 115 V or220 V
b) Warm-up Time
The monitor must be powered on for 15 minutes before starting any alignment, but requires 30 minutes of
warm-up time for convergence adjustment.
c) Signal Input
1. Video: RGB Analog, 0.7 Vp-p, positive
2. Synchronization:
Horizontal and vertical TTL signal, separate, positive or negative
3. All adjustments should be made using a signal of FH = 68 kHz, FV = 85 Hz, unless otherwise defined.
5-1-2 Equipment Required
The following equipments are necessary for adjustment procedures:
1. Volt-ohm-A meter (Sanwa FD-750C or equivalent)
. 30 kV high voltage probe (HP34111A)
. Oscilloscope(TEK2235 or equivalent)
. Minolta Color Analyzer II
. Signal generator (IBM PC with proper display cards or Chroma 2000)
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. Screwdriver
5-1-3Switching Power Supply and Regulator Adjustment
а. Theregulated В+ control has been preset in the factory and needs no adjustment. However, if any repair
is made on the power supply section, the following readjustment procedures are recommended:
1. Allow the monitor to warm-up for about 15 minutes.
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2. Apply XGA (1024 x 768 @ 68 kHz/85 Hz) signal to the monitor.
3. Connect a DC voltage meter to К512-ТР001 end, and adjust VR801 for 12.5 + 0.2 V DC
4. Ifa fuse is broken during adjustment, remember to replace it with the exact same type of fuse.
b. If necessary, follow the following proceduresto enter the factory mode.
1. Press both п) key and 5) key simultaneously then power on.
Now, we are in the factory preset mode.
2. When turns the power off, monitor will go back to normal mode (user mode).
3. When you used ATE adjustment future, you should switch S705 to ATE (Factory Position). When you
finish the adjustment, please switch S705 to DDC (normal) position to back normal mode.
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Confidential - Do Not Copy
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