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• Trouble Shooting Chart
Problem 1: No voltage appears
at
any
output
terminal.
~
Check AC
COrdi
AC socket, F101, F102
Is there AC 220V (240V
AC switch and C101.
for U.K.I present across
C101?
V~
Check n01
Problem 2: +12V is not developed.
~
Check IC201 and its
peripheral
parts.
r---
Is there AC 20V
present across the
V;:
Check output switching
red lead of n01 7
circuit.
Leave R203 be open;
~
Nrl
N~
does there appear
f---
Check n01.
Check 0201
1Vp-p pulse at pin
No. 11 of IC201.
I . -
V~
Is there DC 20V
present across C2027
.--
Does waveform of the
V~
chart appear in
~V~
collector of Q2027
Check L201 and
C205,C209.
Problem 4: +5V is
not
developed.
No
Check IC301 and its
~
peripheral
parts.
r -
Is there AC 14V
present across the
Check output
yellow lead of T101 7
Yes
switching circuit.
Leave R303 be open;
~
n
No
does there appear
f - -
Check n01.
r-t
Check 0301.
1Vp-p pulse at pin
No. 11 of IC301.
L-
Is there DC 14V
V~
f - -
present across C302?
Does
waveform of the
V~
chart appear in collector
t - - -
of 03027
Check L301, C305.
Yes
and C309, C310.
-14-
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