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SiUS281811EA
Check
Part 6 Service Diagnosis
295
5.4 Power Transistor Check
CHECK 4
Perform the following procedures prior to check.
(1) Power OFF.
(2) Remove all the wiring connected to the PCB where power transistors are mounted on.
[Point of Measurement and Judgment Criteria]
· Measure the resistance value using a tester at each point of measurement below, 10 minutes later
after power OFF.
To use analog multimeter:
Measurement in the resistance value mode in the range of multiplying 1 k
Ω
.
To use digital multimeter:
Measurement is executed in the diode check mode.(
)
[Preparation]
· Multimeter
∗
Preparing a multimeter in the analog system is
recommended.
A multimeter in the digital system with diode check
function will be usable.
No.
Point of
Measurement
Judgment
Criteria
Remarks
+
–
1
P2
U
2 ~ 15 k
Ω
—
2
P2
V
3
P2
W
4
U
P2
15 k
Ω
and
above
(including
)
Due to condenser
charge and so on,
resistance
measurement may
require some time.
5
V
P2
6
W
P2
7
N3
U
8
N3
V
9
N3
W
10
U
N3
2 ~ 15 k
Ω
—
11
V
N3
12
W
N3
No.
Point of
Measurement
Judgment
Criteria
Remarks
+
–
1
P2
U
1.2 V and
over
Due to condenser
charge and so on,
resistance
measurement may
require some time.
2
P2
V
3
P2
W
4
U
P2
0.3 ~ 0.7 V
—
5
V
P2
6
W
P2
7
N3
U
8
N3
V
9
N3
W
10
U
N3
1.2 V and
over
Due to condenser
charge and so on,
resistance
measurement may
require some time.
11
V
N3
12
W
N3
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