Alignments And Adjustments - Acer AC901 Manual

5 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 or 220 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:
3. All adjustments should be made using a signal of FH = 91 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)
2. 30 kV high voltage probe (HP34111A)
3. Oscilloscope (TEK2235 or equivalent)
4. Minolta Color Analyzer II
5. Signal generator (COMPAQ PC with proper display cards or Chroma 2250//2225)
6. Screwdriver
5-1-3 Switching Power Supply and Regulator Adjus tment
a. The regulated B+ 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.
2. Apply XGA (1280 x 1024 @ 91 kHz/85 Hz) signal to the monitor.
3. Connect a DC voltage meter to TP001 end, and adjust VR801 for 10.7 + 0.1 V DC
4. If a fuse is broken during adjustment, remember to replace it with the exact same type of fuse.
b. If necessary, follow the following procedures to enter the factory mode.
1. Press both key and
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2. After turn the power off, monitor will go back to normal mode.
Horizontal and vertical TTL signal, separate, positive or negative
key simultaneously then power On.
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