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ViewSonic Corporation
E771-4
6
Troubleshooting
6-1 No Raster
No Raster
Measure
voltage of В+ at
Т402 pin 3 on
PWB-MAIN
OV
Normal
High
(68 V, 31.5 kHz)
(75 V or more)
"T
Check voltage of
Short Circuit
cathode, heater, Grid
Check МОЇ
Check DC B+ line,
Q411, D817
Check 1801,
Q803, R814,
Check
D801, D802, D803,
0804, T801, R804,
F801
R813, ZD807,
20801, R831,
R830, R818
Confidential - Do Not Copy
Page 21
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