Micom Failure - Kortek KT-2914F Service Manual

5-2-12 Micom Failure

Does 5V appear Pin6 of IC502?
IC502 Pin8 and pin8 wave
form are right?
IC502 Pin 5 is over than
4.5Volt ?
All input/output value
are right?
5-2-13 No Raster
Does fly back pulse at
collector of Q712 appear?
YES
Check the Pin 26 of IC301.Does
12Vp-p pulse appear?
YES
Does the wave form at
pin 8 of T703 appear?
YES
Check the voltage PIN 7 of
IC701 Does 12V DC appear?
YES
Does the wave form at
pin 4 of IC701 appear?
Check heater
voltage 6.3V
YES
YES
YES
YES
Done
NO
NO
NO
NO
YES
NO
Check and replace
X501,C512,C513
NO
Check and replace R507
NO
Check and replace IC502
Check D712,D715
and 80V Line
NO
Check and replace IC301
Check and replace
Q714,Q715,Q713
Check the
12V line
Check and replace
IC701
X501
IC301 26pin
T703 8pin