Mitsubishi Electric MSZ-FD09NA Service Manual page 28

9-5. TROUBLE CRITERION OF MAIN PARTS
MSZ-FD09NA MSZ-FD12NA
Part name
Room temperature therm-
istor (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)
Check method and criterion
Measure the resistance with a tester.
Refer to 9-7. "Test point diagram and voltage", "Indoor electronic control P.C.
board", the chart of thermistor.
Check 9-6. .
Measure the resistance between the terminals with a tester.
(Part temperature 50 ~ 86°F (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 50 ~ 104°F (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.
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
28
RED
Normal
313 ~ 375 Ω
YLW
BRN
268 ~ 322 Ω
223 ~ 268 Ω
Figure
ROTOR
ORN GRN