Daikin RXYQ96PYDN Service Manual page 476

SiUS34-801A_b
[CHECK 4] Power Transistor Check
Perform the following procedures prior to check.
(1) Power Off.
(2) Remove all the wiring connected to the PC board where power transistors are mounted on.
[Preparation]
· Tester
[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 tester:
Measurement in the resistance value mode in the range of
multiplying 1kΩ.
Point of Measurement
No.
+
1
P2
2 P2
3 P2
4 U
5 V
6 W
7 N3
8 N3
9 N3
10 U
11 V
12 W
[PC board and Circuit Diagram]
Troubleshooting
Judgment Criteria Remarks
–
U
2 ~ 15kΩ
V
W
P2
P2
Due to condenser charge
15kΩ and
P2 and so on, resistance
above
measurement may require
U
(including )
some time.
V
W
N3
2 ~ 15kΩ
N3
N3
Troubleshooting (OP: Unified ON/OFF Controller)
∗ 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
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
J1
J2
J3
P1 P3
P1
DM
X10A K2
J1
L1
J2
L2
L3
J3
Judgment Criteria Remarks
–
Due to condenser charge
U
and so on, resistance
1.2V and over
V
measurement may require
some time.
0.3 ~ 0.7V
U
V
Due to condenser charge
and so on, resistance
1.2V and over
measurement may require
some time.
U V W
N3
P2 P3
IGBT
N3
U V W
X11A
)
(V2895)
461