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Alignments and Adjustments
MD 1998LE (B1997PNST)
4
Alignments and Adjustments
This section of the service manual explains how to make permanent adjustments to the monitor settings.
4-1 General Adjustments
4-1-1 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:
Horizontal and vertical TTL signal, separate, positive or negative
3. All adjustments should be made using a signal of FH = 93.75 kHz, FV = 75 Hz, unless otherwise
defined.
4-1-2 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 (IBM PC with proper display cards or Chroma 2250 or equivalent)
6. Screwdriver
4-1-3 Switching Power Supply and Regulator Adjustment
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 (1600 x 1200 @ 93.75Khz / 75 Hz) / crosshatch pattern to the monitor.
3. Connect a DC voltage meter to D820, Heat Sink and adjust VR801 for 17.5 ± 0.1 V.
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 procedure to enter the factory preset mode:
1. At power off mode, turn S701 SW to alignment position close to CRT side.
2. Press both key and key simultaneously then power on to enter the factory preset mode.
3. Turn on the power again to return back to normal mode (user mode).
4. After finishing the manual alignment, S701 SW has to be returned back to its normal stage (close to
FBT side). Otherwise the DDC can not be read.
