Mitsubishi Diamond Pro 750SB Service Manual page 81

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CHECK
B301 EMITTER H-BLKD
PULSE 40Vp-p
YES
CHECK
Q305 DRAIN PULSE
280Vp-p
YES
CHECK
G1 VOLTAGE ABOUT
-20 ~ -5V
YES
TROUBLE IN
G2 VOLTAGE T301
NO
CHECK
FBT 2PIN
NO
80V
YES
NO
6-7
TROUBLE IN
C331, D316, C332
TROUBLE IN
NO
Q309, R301, D151
TROUBLE IN
U301, Q303, Q305
TROUBLE IN
Q307, ZD303, T301, D309