Daikin VRV-WIII RWEYQ72PTJU Service Manual page 252

Troubleshooting by Indication on the 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, after 10 minutes 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
2
P2
3 P2 W
4 U P2
5 V P2
6 W P2
7 N3
8 N3
9 N3 W
10 U N3
11
V N3
12 W N3
[PCB and Circuit Diagram]
244
Judgement Criteria Remarks
–
U
2 ~ 15kΩ
V
Due to condenser charge
15kΩ or
and so on, resistance
more
measurement may require
U
(including )
some time.
V
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
1.2V and over
2 P2 V
3 P2 W
4 U P2
5 V P2
6 W P2
0.3 ~ 0.7V
7 N3 U
8 N3 V
9 N3 W
10 U N3
11 1.2V and over
V N3
12 W N3
SiUS30-1301
)
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