Troubleshooting - HP mx703 Service Manual

5 Troubleshooting

5-1 No Raster
Short Circuit
Yes
Check DC
Check voltage
B+ line, Q451,
Q402, T402
I801, R807,
R808, Q801,
Q803, ZD802,
Page 18
0 V
at load?
No
of C808
No
Yes
Check
Check D801,
D802, D803,
D804, T801,
R804, F801
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.
HP mx703/m703
High
(75 V or
more)
Check I401,
I703, R719, C741,
R4F6, R4F5, R4C4