Power Transistor Check - Daikin VRV EMERION REYQ-AATJA Service Manual

SiUS372201EB
4.4

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
h Multimeter
Point of Measurement and Judgment Criteria
 Turn OFF the power supply. Then, after a lapse of 10 minutes or more, make measurement of
No.
1
2
3
4
5
6
7
8
9
10
11
12
PCB and Circuit Diagram
 REYQ96/120AATJ* (M1C, M2C), REYQ144/168AATJ* (M1C)
W V U
Part 6 Service Diagnosis
resistance.
When using the analog type of multimeter,
Measuring
make measurement in resistance
point
measurement mode in the x1 k range.
+ – Judgement Criteria
P2 U
P2 V
50 k ~ 500 k
P2 W
U P2
V P2
W P2
50 k and more
(including )
N31 U
N31 V
N31 W
U N31
V N31
50 k ~ 500 k
W N31
 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 Judgement Criteria
—
Due to condenser
charge and so on,
resistance
measurement may
0.3 ~ 0.7 V
require some time.
—
P2
N32
Check
Remarks
Due to condenser
charge and so on,
OL resistance
measurement may
require some time.
—
Due to condenser
charge and so on,
OL resistance
measurement may
require some time.
230 V 100P
454