Daikin VRV III-S RXYMQ36 48PVJU Service Manual page 222

SiUS34-907
CHECK 4
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
[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.
Point of
Measurement Judgement
No.
+ –
1 P2 U
2 P2 V
3 P2 W
4 U P2
5 V P2
6 W P2
7 N3 U
8 N3 V
9 N3 W
10 U N3
11 V N3
12 W N3
Troubleshooting
Remarks
Criteria
2 ~ 15kΩ
Due to condenser
15kΩ and
charge and so on,
above
resistance
(including
measurement may
∞)
require some time.
2 ~ 15kΩ
* Preparing a tester in the analog system is recommended.
A tester in the digital system with diode check function will be
usable.
To use digital tester:
Measurement is executed in the diode check mode.(
Point of
Measurement
No.
+ –
1 P2 U
2 P2 V
3 P2 W
4 U P2
5 V P2
6 W P2
7 N3 U
8 N3 V
9 N3 W
10 U N3
11 V N3
12 W N3
Judgement
Remarks
Criteria
Due to condenser
charge and so on,
1.2V and
resistance
over
measurement may
require some time.
0.3 ~ 0.7V
Due to condenser
charge and so on,
1.2V and
resistance
over
measurement may
require some time.
)
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