Mitsubishi Electric 1786FD2 Service Manual page 84

MEA 1786FD2 CRT Monitor Service Guide
9. SPOT KILLER NG
G1=0
VDC
CHECK BLANK SIGNAL
UC CKT
SPOT KILLER NG
CHECK -190V
YES
CHECK Q203 CIRCUIT
OK
G1< -50VDC
CHECK CONNECTOR
G1 VOLTAGE
CHECK
NG
Q202
OK OK
CHECK
R216,R217,R218
HOLDDOWN CKT
NO
CHECK -190V TRACE
CHECK G1 VOLTAGE
IF IT BECOMES
VERY LOW (LESS THAN
-120VDC) WHEN POWER
SWITCH OFF.
YES
CHECK Q202
REPLACE
Trouble Shooting
NG
9