Mitsubishi Electric MSZ-FD25VA Service Manual page 27

10-5. TROUBLE CRITERION OF MAIN PARTS
MSZ-FD25VA MSZ-FD25VAS MSZ-FD35VA MSZ-FD35VAS MSZ-FD50VA MSZ-FD50VAS
Part name
Room temperature ther-
mistor (RT11)
Indoor coil thermistor
(RT12, RT13)
Indoor fan motor (MF)
Horizontal vane motor
(MV1)
Vertical vane motor
(MV2)
i-see Sensor motor
(MT)
i-see Sensor (RR)
PLASMA electrode unit
Check method and criterion
Measure the resistance with a tester.
Refer to 10-7. "Test point diagram and voltage", "Indoor electronic control
P.C. board", for the chart of thermistor.
Check 10-6. .
Measure the resistance between the terminals with a tester.
(Part temperature 10 ~ 30°C)
Horizontal vane motor (MV1)
Vertical vane motor (MV2)
i-see Sensor motor (MT)
Cover the i-see Sensor with black vinyl tape. Then, turn ON the power
supply. (i-see Sensor is energized.) Measure the voltage between connector
terminals of i-see Sensor with a tester.
(Part temperature 10 ~ 40°C)
i-see Sensor
i-see Sensor P.C. board
Black vinyl tape
i-see Sensor connector terminals
(GND) - (+)
(+) - (GND)
NOTE: Pay attention to static electricity.
Check 10-6.
Color of the lead wire
BRN - other one
Cover the i-see
4
Sensor with
3
black vinyl tape.
2(GND)
1
connector
Normal range
1.874 ~ 3.387 VDC
1.010 ~ 1.420 VDC
27
Figure
RED
YLW
Normal
BRN
313 ~ 375 Ω
268 ~ 322 Ω
223 ~ 268 Ω
ROTOR
ORN GRN