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No
1.
2 .
3 .
4 .
5 .
C o l l e c t o r Waveforms
o u t p u t
S h o r t e d S e c o n d a r y Components
Check f u s e :
I f f u s e is blown, replace it b u t do n o t a p p l y power u n t i l t h e
c a u s e of t h e f a i l u r e is f o u n d .
P r e l i m i n a r y Check on Major P r i m a r y Components:
Check
diode
b r i d g e
( I l l ) ,
p o w e r t r a n s i s t o r ( Q l ) , a n d d r i v e
t r a n s i s t o r ( 4 2 , 4 3 1 f o r s h o r t e d j u n c t i o n s .
I f a n y component
is
f o u n d s h o r t e d , replace
i t .
P r e l i m i n a r y
C h e c k
on Major S e c o n d a r y Components:
U s i n g a n ohmmeter from a n o u t p u t t h a t is common t o e a c h
o u t p u t a n d w i t h o u t p u t
loads
d i s c o n n e c t e d , c h e c k f o r s h o r t e d
r e c t i f i e r s or c a p a c i t o r s .
Check Over V o l t a g e Protector:
Read
t h e o u t p u t v o l t a g e
w i t h
a
DVM
a t t h e
+5
o u t p u t t e r m i n a l s
by i n c r e a s i n g t h e i n p u t v o l t a g e f r o m
OV.
O u t p u t v o l t a g e
w i l l
a p p e a r a t some i n p u t v o l t a g e and t h e n go down t o OV a g a i n .
Check t h e D i o d e
D 1 1
or P h o t o C o u p l e r (PHCZ)
.
Check
Q1
Waveforms
:
Read
waveform of
Q 1
Collector w i t h oscilloscope a t x 1 0 0
p r o b e .
F i g u r e 2
is Q1 Collector
n o r m a l waveform.
F i g u r e 3
is
Q 1
Base
n o r m a l waveform.
F i g u r e
4
is t h e waveforms when s h o r t e d c i r c u i t s of t h e
s e c o n d a r y p a r t s as
l i s t e d
i n T a b l e
2 .
Check l i s t e d p a r t s
a c c o r d i n g t o t h e waveform.
I
I
Table
2 .
L i s t of S h o r t e d C i r c u i t s
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