Mitsubishi Electric MUZ-HJ25VA-E2 Service Manual page 43

11-4. TROUBLE CRITERION OF MAIN PARTS
MUZ-HJ25VA MUZ-HJ35VA MUZ-HJ50VA MUZ-HJ60VA MUZ-HJ71VA
Part name
Defrost thermistor
(RT61)
MUZ-HJ50VA
MUZ-HJ60VA
MUZ-HJ71VA
Outdoor heat exchanger
temperature thermistor
(RT68)
Discharge temperature
thermistor (RT62)
Fin temperature thermistor
(RT64)
Compressor (MC)
MUZ-HJ25VA
MUZ-HJ35VA
Outdoor fan motor (MF)
INNER FUSE
RA6V21-AB
+0
152 °C CUT OFF
-5
RA6V21-BB
126 ± 2: CUT OFF
MUZ-HJ50VA
MUZ-HJ60VA
MUZ-HJ71VA
Outdoor fan motor (MF)
R.V. coil (21S4)
MUZ-HJ25VA
MUZ-HJ50VA
MUZ-HJ60VA
MUZ-HJ71VA
Expansion valve coil (LEV)
MUZ-HJ35VA
Expansion valve coil (LEV)
OBH648F
Check method and criterion
Measure the resistance with a tester.
Refer to 11-6. "Test point diagram and voltage", 1. "Inverter P.C.
board", for the chart of thermistor.
Measure the resistance with a tester.
Before measurement, hold the thermistor with your hands to warm it up.
Refer to 11-6. "Test point diagram and voltage", 1. "Inverter P.C.
board", for the chart of thermistor.
Measure the resistance between the terminals with a tester.
(Part temperature -10 ~ 40°C)
Normal
U-V
MUZ-HJ25VA MUZ-HJ35VA MUZ-HJ50VA MUZ-HJ60/71VA
U-W
2.01 ~ 2.86 Ω 1.20 ~ 1.72 Ω 0.78 ~ 1.11 Ω 0.78 ~ 1.11 Ω
V-W
Measure the resistance between the terminals with a tester.
(Part temperature -10 ~ 40°C)
Color of lead wire
WHT – BLK
BLK – RED
Color of lead wire
RED – BLK
BLK – WHT
WHT – RED
Measure the resistance between the terminals with a tester.
(Part temperature -10˚C ~ 40°C)
Normal
MUZ-HJ25/35/60/71VA
1.19 ~ 1.78 kΩ
Measure the resistance using a tester.
(Temperature: -10 ~ 40°C)
Color of lead wire
RED – ORN
RED – WHT
RED – BLU
RED – YLW
Measure the resistance using a tester.
(Part temperature: -10 ~ 40°C)
Color of lead wire
WHT – BRN
BRN – ORN
YLW – RED
RED – BLU
Normal
MUZ-HJ25/35VA
RA6V21-AB RA6V21-BB, BD
305 ~ 374 Ω 222 ~ 272 Ω
247 ~ 304 Ω 245 ~ 300 Ω
Normal
MUZ-HJ50VA MUZ-HJ60/71VA
30 ~ 43 Ω 11 ~ 16 Ω
MUZ-HJ50VA
1.41 ~ 2.00 kΩ
Normal (Ω)
37 ~ 54
Normal
37 ~ 54 Ω
43
Figure
WHT RED BLK
2 3
1
W
V
U
FUSE
BLK RED WHT
WHT RED BLK
W
V
U
WHT
LEV
ORN
RED
(+12V)
WHT
BRN LEV
ORN