Power Transistor Check - Daikin Aurora Series Service Manual

SiUS341802E
3.4

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
RXLQ72TATJU
Point of Measurement and Judgement Criteria
Turn OFF the power supply. Then, after a lapse of 10 minutes or more, make measurement of
resistance.
When using the analog type of multimeter,
make measurement in resistance
measurement mode in the x1 kΩ range.
PCB and Circuit Diagram
Service Diagnosis
Measuring
Judgement
point
No.
criteria
+ –
1 P4 U
2 P4 V 2 ~ 30 kΩ
3 P4 W
4 U P4
5 V P4
15 kΩ or
6 W P4
more
7 N4 U
(including )
8 N4 V
9 N4 W
10 U N4
11 V N4 2 ~ 30 kΩ
12 W N4
U
V
W
P4
N4
∗ Prepare the analog type of multimeter.
For the digital type of multimeter, those with
diode check function are available for the
checking.
When using the digital type of multimeter,
make measurement in diode check mode
(
Remarks
Due to condenser
charge and so on,
resistance
measurement may
require some time.
)
Measuring
Judgement
point
No.
criteria
+ –
1 P4 U
1.2 V or
2 P4 V
more
3 P4 W
4 U P4
5 V P4
6 W P4
0.3 ~ 0.7 V
7 N4 U
8 N4 V
9 N4 W
10 U N4
1.2 V or
11 V N4
more
12 W N4
230V 16K
L1B L2B L3B
X41A
R1
K3R
X601A
PS
K84R
+ –
P11 V1R
P22
P21
V1D
K1M
C1
+
SHT1
+ -
V1R
HAP
U V W
Check
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.
X4A
X6A
X63A
N4
P4
N5
BLU
WHT
P5 RED
X6A
X71A
X72A
286