Specifications

SiUS34-907
Troubleshooting 213
Power Transistor Check
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.
[Preparation]
· Tester
* Preparing a tester in the analog system is recommended.
A tester in the digital system with diode check function will be
usable.
[Point of Measurement and Judgement Criteria]
· Measure the resistance value using a tester at each point of measurement below, 10 minutes later after power OFF.
To use analog tester:
Measurement in the resistance value mode in the range
of multiplying 1kΩ.
To use digital tester:
Measurement is executed in the diode check mode.( )
No.
Point of
Measurement
Judgement
Criteria
Remarks No.
Point of
Measurement
Judgement
Criteria
Remarks
+– + –
1P2 U
2 ~ 15kΩ
1P2 U
1.2V and
over
Due to condenser
charge and so on,
resistance
measurement may
require some time.
2P2 V 2 P2 V
3P2 W 3 P2 W
4U P2
15kΩ and
above
(including
∞)
Due to condenser
charge and so on,
resistance
measurement may
require some time.
4U P2
0.3 ~ 0.7V
5V P2 5 V P2
6W P2 6 W P2
7N3 U 7 N3 U
8N3 V 8 N3 V
9N3 W 9 N3 W
10 U N3
2 ~ 15kΩ
10 U N3
1.2V and
over
Due to condenser
charge and so on,
resistance
measurement may
require some time.
11 V N3 11 V N3
12 W N3 12 W N3
CHECK 4