Daikin REYQ-XA, Service Manual

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Check SiUS371901E
377 Service Diagnosis
4.4 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
REYQ72-120XATJU
Point of Measurement and Judgment Criteria
Turn OFF the power supply. Then, after a lapse of 10 minutes or more, make measurement of
resistance.
PCB and Circuit Diagram
CHECK 4
Multimeter
∗
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 analog type of multimeter,
make measurement in resistance
measurement mode in the x1 k
Ω
range.
When using the digital type of multimeter,
make measurement in diode check mode
(
)
No.
Measuring
point
Judgment
criteria
Remarks No.
Measuring
point
Judgment
criteria
Remarks
+ – + –
1 P4 U
2 ~ 30 k
Ω
—
1 P4 U
1.2 V or
more
Due to condenser
charge and so on,
resistance
measurement may
require some time.
2 P4 V 2 P4 V
3 P4 W 3 P4 W
4 U P4
15 k
Ω
or
more
(including
)
Due to condenser
charge and so on,
resistance
measurement may
require some time.
4 U P4
0.3 ~ 0.7 V —
5 V P4 5 V P4
6 W P4 6 W P4
7 N4 U 7 N4 U
8 N4 V 8 N4 V
9 N4 W 9 N4 W
10 U N4
2 ~ 30 k
Ω
—
10 U N4
1.2 V or
more
Due to condenser
charge and so on,
resistance
measurement may
require some time.
11 V N4 11 V N4
12 W N4 12 W N4
V1R
L3B
P22
PS
X41A
V1R
N5
V1D
SHT1
L2B
K1M
R1
V
+
X72A
WHT
X63A
L1B
-
X6A
C1
P21
W
BLU
X4A
HAP
X601A
U
K3R
+
K84R
X71A
P11
–
P4
+
X6A
N4
P5 RED
230 V 16K
N4
U
V
W
P4