NO
NO
NO
Is IC4140 (TOP268VG) dam-
aged?
Is D4142, D4143, D4144,
D4145 or IC4140 damaged?
Repair the short circuited area
on the PCB.
Check the damaged parts.
Replace the damaged part.
Replace the damaged part.
Is the fuse (F4140) functioning
properly?
Are there any short circuits
caused by the soldering on
the PCB?
Are any parts damaged?
Replace the IC4140
(TOP268VG) and D4142 /
D4143 /D4144 / D4145.
DC 5V is not output.
R
414
3
330
K
100
N
-K
C
415
0
100
N
-K
C
415
9
1N4007
D4144
1N4007
D4143
1N4007
D4142
R
414
8
2M
2
OPTION
C
414
7
100
N
-K
10
N
-K
C
414
6
1N4007
D4145
ZJ12B
ZD4162
ZJ12B
ZD4163
OPTION
D4146
1N4007
R
415
0
1M
R
414
9
2M
2
47/25(NXA)
C4152
ZD4150
ZJ27B
10/50(NXA)
C4155
1N4007
D4148
OPEN
C4157
C
416
3
1U
-K
22(1)
R4165
R4155
10K
D4150
1N4148
4700
N
-K
C
416
1
2
1
3
S30SC6MT
D4149
D
414
0
1N
400
7
D
414
1
1N
400
7
ZJ7.5B
ZD4160
3
1
2
INK0010AC1
TR4140
ZJ12B
ZD4164
R4153
6R8
ZD4158
ZJ39B
R4154
10
BKT4143
M3
5600/6.3(
N
XA
)
C
416
2
5600/6.3(
N
XA
)
C
416
4
5600/6.3(
N
XA
)
C
416
5
R4142
1M
OPTION
OPTION
OPTION
C4160
1U-K
C4156
3300PF/250V
OPTION
R4145
1M
C
414
5
0.047
U
-K
ZD4161
OPEN
R4164
1M
1M
R4141
C4149
0.01UF/250V
0.01UF/250V
C4148
10K
R4152
D4147
AP01C-V1
ZD4156
ZJ22B
ZD4157
ZJ22B
ZD4154
ZJ22B
ZD4152
ZJ22B
ZD4153
ZJ22B
C4153
1000PF/1KV-3216
ZD4148
ZJ39B
ZD4149
ZJ39B
ZD4165
JUMPER
KTC3198G
TR4142
R4156
4K7
C
416
8
O
PE
N
C4167
OPEN
IC4143
KIA2431AP
R4147
270K
ZD4155
ZJ22B
100N-K
C4154
R4151
11K
ZD4151
ZJ22B
C
415
1
100
/200(
NH
A
)
ZD4147
ZJ39B
C4169
2200P-100V(PEF)
C
417
0
O
PE
N
(15000
/6
.3
)
4
10
6
5
2
12
9
13
W
1
3
W
4
W
3
W
5
W
2
EER2525
T4140
1
12
2 3
10
4
8
9
6
7
11
IC4140
TOP268VG
S
V
S
S
X
C
S
S
F
S
D
IC4142
PC123X2YFZ
JZC-36FD
RLY4140
A
B
C
After primary side rectification
(Caution: High voltage, electric shock)
Primary drain
(Caution: High voltage, electric shock)
After secondary rectifications
Operation waveform for each part
A
B
C
A
B
C
SMPS unit
(Unloaded)
Set
YES
YES
YES
YES
YES
YES
6. SMPS
80
Caution in
servicing
Electrical
Mechanical
Repair Information
Updating
