Daikin VRV III REYQ10PY1B, Service Manual

Page: 382 / 472

SiBE37-701 Troubleshooting (OP: Unified ON/OFF Controller)
Troubleshooting 371
[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
∗
Preparing a tester in the analog system is recommended.
A tester 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 tester:
Measurement in the resistance value mode in the range of
multiplying 1k
Ω
.
Point of Measurement
Judgment Criteria Remarks
+ –
No.
15k
Ω
and
above
(including
)
2 ~ 15k
Ω
2 ~ 15k
Ω
Due to condenser charge
and so on, resistance
measurement may require
some time.
P2
P2
P2
U
V
W
N3
N3
N3
U
V
W
1
2
3
4
5
6
7
8
9
10
11
12
P2
P2
P2
U
V
W
U
V
W
N3
N3
N3
Point of Measurement
Judgment Criteria Remarks
+ –
No.
0.3 ~ 0.7V
1.2V and over
1.2V and over
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.
P2
P2
P2
U
V
W
N3
N3
N3
U
V
W
1
2
3
4
5
6
7
8
9
10
11
12
P2
P2
P2
U
V
W
U
V
W
N3
N3
N3
To use digital tester:
Measurement is executed in the diode check mode. ( )
[PC board and Circuit Diagram]
P3
U V W
N3
J1
J2
J3
P1
P1 P2
IGBT
X11A
U V W
L1
L2
L3
X10A
DM
K2
P3
N3
(V2895)
J1
J2
J3