5-4.Trouble Shooting Forpower Supply - Sanyo SFX-110 Service Manual

5-4. Trouble shooting for power supply
Refer to the power
s~pply c-ircuit diagram- (page
48 and 67)
'L
'L-
.
Symptom Cauae
Parts damaged Out-put
oper
No AC supply to the PSI-I, F1 OPEN
No out-put
L1 OPEN No out-put
No lightning protection works Z1 OPEN
Normal operation
Z1 SHORT F1 OPEN No out-put
EMI noise (big) cl OPEN Normal operation
cl SHORT F1 OPEN
No out-put
C7
OPEN Normal operation
C7
SHORT
Normal operation
Rush current (big) NTC1 SHORT
Normal operation
No rectify circuit works D11 SHORT F1 OPEN No out-put
D12 SHORT F1 OPEN
No out-put
D13 SHORT
F1 OPEN No out-put
D14
SHORT
F1 OPEN No out-put
C5
OPEN FI OPEN, Q1 SHORT No out-put
C5 SHORT
F1 OPEN No out-put
No switching circuit works QI D
OPEN No out-put
Q1 S
OPEN
No out-put
Q1 G OPEN
F1 OPEN, Q1 SHORT No out-put
Q1 D-S SHORT
FI OPEN No out-put
Q1 G-S SHORT No out-put
Q1 D-G SHORT F1 OPEN, Q1 SHORT
No out-put
Q2 E
OPEN F1 OPEN, Q1 SHORT No out-put
Q2 C
OPEN FI OPEN, Ql, D104 SHORT
No out-put
Q2 B OPEN
F1 OPEN, Ql, D104 SHORT No out-put
Q2 C-E SHORT
Q2 B-E
No out-put
SHORT F1 OPEN, Q1 SHORT No out-put
Q2 C-B SHORT
No out-put
No current feed back circuit works
Rll OPEN Normal operation
Rll SHORT No out-put
R12 OPEN
Normal operation
R12 SHORT
No out-put
D5 OPEN Normal operation
SHORT
::3
Normal operation
SHORT No out-put
No out-put at all D101 OPEN FI OPEN, Q1 SHORT No out-put
D101 SHORT
F1 OPEN, Q1 SHORT No out-put
D4 OPEN
F1 OPEN, Q1 SHORT No out-put
D102
SHORT
FI OPEN, Q1 SHORT No out-put
All Out-put IOW IC101 IN-GND SHORT
All
Out-put IOW
(No enough out-put appears) D104 SHORT
All
Out-put IOW
D11O SHORT All
Out-put IOW
D11O OPEN
D104 SHORT All
Out-put IOW
D101 C
OPEN
D104 SHORT All
Out-put IOW
D101 E OPEN D104 SHORT All
Out-put IOW
D101 B OPEN DI04 SHORT
All
out-put IOW
D11O B-E SHORT
D104 SHORT All
Out-put IOW
PC1 PRI SHORT D104 SHORT All
Out-put IOW
PC1 SEC SHORT D104 SHORT
All
Out-put IOW
PC1 SEC OPEN
D104 SHORT All
Out-put IOW
-1 5V out-put low
D107 SHORT -1 5V out-put low
Q102 C
OPEN
-1 5V out-put low
Q102 E OPEN
-1 5V out-put low
Q102 B
OPEN -1 5V out-put low
Q102 B-E
SHORT -1 5V out-put low
Q102 C-B SHORT
-1 5V out-put low
D105 OPEN -1 5V out-put low
D105 SHORT IP101 OPEN -1 5V out-put low
D106 OPEN
-1 5V out-put low
D106 SHORT IP101 OPEN -1 5V out-put low
-1 5V out-put high
Q102 C-E
SHORT -1 5V out-put high
D107 OPEN
-1 5V out-put high
+5V out-put low
IC101 IN OPEN +5V out-put low
IC101 OUT OPEN
+5V out-put low
IC101 OUT-GND SHORT
+5V out-put low
D102 OPEN
+5V out-put low
+5V out-put high IC101 GND OPEN
+5V out-put high
IC101 IN-GND SHORT
+5V out-put high
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