Power Transistor Check - Daikin SkyAir RZR-TA Series Service Manual

SiUS281811EA
5.4

Power Transistor Check

CHECK 4
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
[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 kΩ.
No.
1
2
3
4
5
6
7
8
9
10
11
12
To use digital multimeter:
Measurement is executed in the diode check mode.(
No.
1
2
3
4
5
6
7
8
9
10
11
12
Part 6 Service Diagnosis
Point of
Judgment
Measurement
Criteria
+ –
P2 U
P2 V 2 ~ 15 kΩ
P2 W
U P2
V P2
15 kΩ and
W P2
above
(including
N3 U
)
N3 V
N3 W
U N3
V N3 2 ~ 15 kΩ
W N3
Point of
Judgment
Measurement
Criteria
+ –
P2 U
P2 V 1.2 V and
over
P2 W
U P2
V P2
W P2
0.3 ~ 0.7 V
N3 U
N3 V
N3 W
U N3
V N3 1.2 V and
over
W N3
∗ Preparing a multimeter in the analog system is
recommended.
A multimeter in the digital system with diode check
function will be usable.
Remarks
—
Due to condenser
charge and so on,
resistance
measurement may
require some time.
—
)
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.
Check
295