Star Tech Journal

17
STAR*TECH JOURNAL/APRIL 1983
FAILURE
ON THE
PRIMARY
SIDE
NO
OUTPUT
FAILURE
ON +12V
YES
'
,I
THE F1-FUSE WILL
BE INSTANTLY
CUT.
-1 BRIDGE RECTIFIER
1
YES
.J
1 05 (C2335)
I
I 01
I
-1
YES
' I
THE F2-FUSE (A)
WILL BE INSTANTLY
CUT.
NO
YES
'"
(C2612)
, I
I
I
I
1 025 (RD18E)
J C27 (33uF 25V)
-1
NO
THE VOLTAGE IS
LOW OR NO
VOLTAGE APPEARS.
I
YES
, I
023 (RD11 E)
'I
,I
NO
'I 010 (RD5.1 E)
I
, I
'I
04 (RD6.8E)
I
, I
'I
02 (C1384)
I
\V
,I
,v
V
THE VOLTAGE IS
TOO LARGE.
,v
/I IC1
(uPC311 C) BETWEEN PIN 4 AND PIN 8
l
,I
'I 06
(CTU22S)
I
"
C7,
'I
YES
ca
,I
J C6 (47uF 16V) CIRCUIT CUT OR BAD SOLDERING
'I
,I
'I IC1
\[/
'I 04 (C945)
'I
'
'I 03 (C945) BAD CONNECTION
YES
, I
IC1
'1
,I
R22
1
(uPC311C) BETWEEN PIN 2 and PIN 3
NO
I ,
1
YES
'
'
THE F3-FUSE
WILL BE INSTANTLY
CUT.
YES
I
NO
THE VOLTAGE IS
LOW OR NO
VOLTAGE APPEARS.
YES
~
R26
(RD18E)
C28 (33uF 25V)
)I 07
I
I
I
(1K11.V4) NO CONNECTION OF CENTRAL TERMINAL OR BAD1j
SOLDERING
,
OUTPUT
FAILURE
ON -12V
I
(uPC311C) DEFECTIVE
d
' II
I
I
'I 02 (C1384)
NO
THE VOLTAGE
CAN NOT BE
ADJUSTED.
I
(1 OOOuF 25V)
(CTU22S)