6. SMPS
Operation waveform for each part
Is [U4140 : TOP268VG] dam-
aged?
Is [D4142 / D4143 / D4144 /
D4145 / U4140] 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 [U4140 : TOP268VG
and D4142 / D4143 / D4144 /
D4145].
DC 5V is not output.
NO
NO
NO
YES
YES
YES
YES
YES
YES
1
3
2
R
414
3
330
K
O
PEN
C
415
0
C
415
3
G
R
M
31
C
7U
3A
102
JW
32
L
OPTION
R4164
1M
OPTION
OPTION
R4142
1M
1M
R
414
5
ZJ7.5B
ZD4160
OPTION
R
415
0
1M
R
414
9
2M
2
ZD4148
ZJ39B
ZD4149
ZJ39B
OPTION
R4151
11K
R4153
6R8
D4146
1N4007S
O
PEN
C
416
9
ZD4150
ZJ27B
ZD4151
P6KE150A
C
415
4
100
N
-K
TR4142
KTC3198G
BKT4142
100
N
-K
C
415
9
R4156
4K7
100N-K
C4165
C
417
1
O
PEN
100
N
C
414
5
100
N
C
414
6
100
N
-K
C
414
7
D
414
1
1N
4007
S
R4141
1M
D
414
0
1N
4007
S
OPEN
ZD4161
C
415
1
100
/200
(SK)
R
414
7
270
K
ZJ15B
ZD4165
R
414
8
2M
2
ZD4147
ZJ39B
R4152
10K
C4160
1UF-K
C
416
2
5600/6.3
(12.5
*3
5)
C
416
3
5600/6.3
(12.5
*3
5)
C
416
4
5600/6.3
(12.5
*3
5)
U4143
KIA2431AP
C
417
2
1000
P
/1
KV
OPTION_2
OPTION
C4149
CT714eV5V103M250VacB
D4144
1N4007S
D4145
1N4007S
D4142
1N4007S
D4143
1N4007S
C4148
CT714eV5V103M250VacB
ZD4158
ZJ39B
10/50(HG)
C4155
D4147
AP01C-V1
UF4004
D4148
R4155
10K
C4157
OPEN
4700
N
-K
C
416
1
C4152
47/25(HG)
R4154
10
D4150
1N4148
4
10
6
5
2
12
9
13
3
EER2525
T4140
4700
N
-160
8
C
417
3
D4149
MBR3060PT
C4156
CT710eV5V222M400VacB
TR4141
INK0010AC1
1
12
2 3
10
4
8
9
6
7
11
TOP268VG
IC_TOP268VG
U4140
S
V
S
S
X
C
S
S
F
S
D
ZD4162 ZJ12B
ZJ12B
ZD4163
ZD4164 ZJ12B
U
414
2
RLY4140
JZC-36FD/005-HLT
A
B
C
After primary side rectification
(Caution: High voltage, electric shock)
Primary drain
(Caution: High voltage, electric shock)
After secondary rectifications
A
B
C
A
B
C
SMPS unit
(Unloaded)
Set
Before Servicing
This Unit
Electrical
Mechanical
Repair Information
Updating
80
