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Does 900V p-p fly back pulse
appear on pin 1 of FBT?
Check and replace
Q704,D708,R716
Q701,703 base driving pulse exist?
Check and replace Q704
Q704 drain pulse exist?
Check +12V,Q701,703
Q704 gate pulse exist?
Check and replace D708,709
Pin 9 of IC701 pulse exist?
Replace IC701
YES
NO
YES
NO
NO
YES
YES
NO
NO
6-1-8 High Voltage Failure
Check pin 36 of IC501 output
varies with different value?
(DC 0V
～
5V)
Check pin 7,8 of IC105
output varies with different
value? (DC 1V ~ 6V)
Check and replace IC501
Check and replace IC105
Check L304 output
varies with different value?
NO
YES
YES
NO
6-1-7 H-Linearity Failure
L304
Q701,Q703 BASE
FBT 1pin
