Compaq CRT Monitor s7500 Service Guide - Page 16

Alignments and Adjustments

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HP S7500/MV7500/CV7500 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 AdjustmentConditions a) PowerSupply Apply AC 115 V or 220 V b) Warm-up Time The monitor mustbe powered on for 15 minutesbefore starting any alignment, but requires30 minutes of warm-up timefor convergence adjustment. c) SignalInput 1. Video: RGBAnalog, 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. 4-1-2 EquipmentRequired The followingequipments are necessary for adjustment procedures: 1. Volt-ohm-A meter (SanwaFD-750C or equivalent) 2. 30 kVhigh voltage probe (HP34111A) 3. Oscilloscope (TEK2235 orequivalent) 4. Minolta Color Analyzer II 5. Signal generator (IBM PC with proper display cards or Chroma 2000) 6. Screwdriver 4-1-3 Switching Power Supplyand 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 supplysection, the following readjustment procedures are recommended: 1. Allow the monitor towarm-up for about 15 minutes. 2. Apply VGA (1024x 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. Page 14

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Page 14
HP S7500/MV7500/CV7500
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) SignalInput
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.
4-1-2
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 2000)
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 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.