Troubleshooting - HP CRT Monitor s7500 Service Manual

5 Troubleshooting

5-1 No Raster
Yes
Check DC
B+ line, Q451,
Q402, T402
Page 18
0 V
Short Circuit
at load?
No
Check voltage
of C808
Yes
Check
I801, R807,
R808, Q801,
Q802, ZD802,
VR801
No Raster
Measure
voltage of B+ at
T402 pin 2 on
PWB-MAIN
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
HP S7500/MV7500/CV7500
High
(75 V or more)
Check I401,
I703, R719, C741,
R4F6, R4F5, R4C4