Daikin VRV II-Q RQYQ8-48PY1B Service Manual page 192

Troubleshooting by Remote Controller
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
No.
+ –
1 P2 U
P2 V
2
3 P2 W
4 U P2
V P2
5
6 P2
W
7 U
N3
8
N3 V
9 N3 W
10 U N3
11 V N3
W
12 N3
[PCB and Circuit Diagram]
182
Judgement Criteria Remarks
2 ~ 15kΩ
Due to condenser charge
15kΩ and
and so on, resistance
above
measurement may require
(including )
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. Judgement Criteria
+ –
1 P2
U
P2 V 1.2V and over
2
3 P2 W
4 U P2
5 V P2
6 P2
W
0.3 ~ 0.7V
U
7 N3
8 N3 V
N3 W
9
10 U N3
11 1.2V and over
V N3
W
12 N3
SiBE341027
)
Remarks
Due to condenser charge
and so on, resistance
measurement may require
some time.
Due to condenser charge
and so on, resistance
measurement may require
some time.
Service Diagnosis