Daikin RXSQ24TAVJU, Service Manual, Page: 273 / 311

SiUS331708EA Check
Service Diagnosis 260
5.4 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]
· Multimeter
* Preparing a multimeter in the analog system is
recommended.
A multimeter in the digital system with diode check function will
be usable.
[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.(
)
No.
Point of
Measurement
Judgment
Criteria
Remarks No.
Point of
Measurement
Judgment
Criteria
Remarks
+ – + –
1 P2 U
2 ~ 15 k
Ω
1 P2 U
1.2 V and
over
Due to condenser
charge and so on,
resistance
measurement may
require some time.
2 P2 V 2 P2 V
3 P2 W 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.
4 U P2
0.3 ~ 0.7 V
5 V P2 5 V P2
6 W P2 6 W P2
7 N3 U 7 N3 U
8 N3 V 8 N3 V
9 N3 W 9 N3 W
10 U N3
2 ~ 15 k
Ω
10 U N3
1.2 V 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