Compaq CRT Monitor s7500 Service Guide - Page 20

Troubleshooting

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5 Troubleshooting 5-1 No Raster HP S7500/MV7500/CV7500 No Raster Measure voltage of B+ at T402 pin 2 on PWB-MAIN 0 V Yes Check DC B+ line, Q451, Q402, T402 Short Circuit at load? No Check voltage of C808 Yes Check I801, R807, R808, Q801, Q802, ZD802, VR801 Normal (68 V, 31.5 kHz) Check voltage of cathode, heater, Grid 1, Grid 2, etc. No Check D801, D802, D803, D804, T801, R804, F801 High (75 V or more) Check I401, I703, R719, C741, R4F6, R4F5, R4C4 Page 18

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Page 18
HP S7500/MV7500/CV7500
5
Troubleshooting
5-1 No Raster
Check voltage of
cathode, heater,
Grid 1, Grid 2, etc.
Check I401,
I703, R719, C741,
R4F6, R4F5, R4C4
Check
I801, R807,
R808, Q801,
Q802, ZD802,
VR801
Check D801,
D802, D803,
D804, T801,
R804, F801
Yes
No
Normal
(68 V, 31.5 kHz)
Short Circuit
at load?
Measure
voltage of B+ at
T402 pin 2 on
PWB-MAIN
No Raster
0 V
High
(75 V or more)
Check DC
B+ line, Q451,
Q402, T402
Yes
Check voltage
of C808
No