Daikin RXYQ-TA Series, Руководство по обслуживанию, Страница: 308 / 337

Check SiUS341615E
295 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
Point of Measurement and Judgement 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 x1k
Ω
range.
When using the digital type of multimeter,
make measurement in diode check mode
(
)
No.
Measuring
point
Judgement
Criteria
Remarks No.
Measuring
point
Judgement
Criteria
Remarks
+ – + –
1 P2 U
2 ~ 15 k
Ω
1 P2 U
1.2 V and
more
Due to condenser
charge and so on,
resistance
measurement may
require some time.
2 P2 V 2 P2 V
3 P2 W 3 P2 W
4 U P2
15 k
Ω
and
more
(including
)
Due to condenser
charge and so on,
resistance
measurement may
require some time.
4 U P2
0.3 ~ 0.7 V
5 V P2 5 V P2
6 W P2 6 W P2
7 N3 U 7 N3 U
8 N3 V 8 N3 V
9 N3 W 9 N3 W
10 U N3
2 ~ 15 k
Ω
10 U N3
1.2 V and
more
Due to condenser
charge and so on,
resistance
measurement may
require some time.
11 V N3 11 V N3
12 W N3 12 W N3
P3
U V W
N3
J1
J2
J3
P1
P1 P2
IGBT
X11A
U V W
L1
L2
L3
X10A
DM
K2
P3
N3
J1
J2
J3
Since the appearance of PCB shown in this outline drawing is different from
the actual appearance, use it as a reference drawing.