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Check R17,18
and D10.
Are
R17,18 and D10
normal?
Replace R17,18
or D10
YES
Check the swiching of
transistor Q4.
is
Q4
normal?
Replace Q4.
Check if the voltage at the
anode of D8 alternates.
Check if the voltage at the
cathode is about +28VDC.
Is D8
normal?
Replace D8.
Check the voltage out-
put at out pin @ @)
of ICQ.
Is
NO
it about
Replace IC9.
+5VDC?
YES
Check the coil of L5.
NO
<>
Replace L5.
-
YES
20vidiv |
36V
Q2 Base Voltage Waveform
Observe the waveform
at power ON from the
base of Q2.
Is the
waveform
normal?
NO
Replace Q1 and Q2.
Replace D7 or L8.
Are
D7 and L3
normal?
YES
Replace
Ic9.
58V
-}--
10V/div
Q1 Emitter Voltage Waveform
= 10
sec/div
10V/div
36V
J
Q4 Collector Voltage Waveform
2vidlv
5
sec/div
8-31
IC9 @O , @} Voltege Waveform
NOTE: When output voltages are
not normal, check R12,R13.
5
sec/div
10 « sec/div
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