HP S7500/MV7500/CV7500
4Alignments and Adjustments
This section of the service manual explains how to make permanent adjustments to the monitor settings.
4-1General Adjustments
4-1-1Adjustment 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 = 68.68 kHz, FV = 85 Hz, unless otherwise
defined.
4-1-2Equipment 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 2000)
6.Screwdriver
4-1-3Switching 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 VGA (1024 x 768 @ 68.68 kHz/85 Hz) signal to the monitor.
3.Connect a DC voltage meter to TP001 (on the Main board), and adjust VR801 for 11.6 ? 0.1 Vdc
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 1 key and 2 key simultaneously then power ON.
2.After turn the power off, this monitor will go back to normal mode.
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