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Circuits to be checked
• PQwer supply circuit
• Horizontal circuit
Circuits to be checked
1. Raster not visible
• Power supply circuit
• Horizontal circuit
4. TROUBLESHOOTING
POWER IS NOT SUPPLIED
Is there 16V between 0701
collector and ground?
0701,0702,0703, Z0701, C707, R705, R702, R703,
0601,0602,0603,L601,0605,OY,L602,L603,0611,C616
R638, R639
RASTER NOT VISIBLE
2. High voltage is on, but no raster
Is there 11.5V between 0701
emitter and ground?
• Video output circuit
• Horizontal circuit
3. No high voltage supply
• High voltage circuit
Check voltage level of CRT and Gl. Voltage should
change between -20 to +15V when the brightness
control is manipulated, if it is normal.
F701
F702
0701
0702
0703
0704
T701
L701
Check connection of all connectors
residing between monitor and computer.
CRT
D608,C630
T602
Brightness control
potentiometer
R617, R607, R619
6
0607,
C617
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