Mitsubishi SCM40ZJ-S Service Manual page 77

(a) Inspection of electronic expansion valve
• Inspection of electronic expansion valve as a separate unit
Measuring point Resistance when normal
(b) Outdoor unit fan motor check procedure
main
outdoor
Models SCM40, 45, 50, 60, 71, 80
FM
⑥ ⑤ ④
⑥ ⑤ ④
CNFAN
GND
DC280V
Measuring point Resistance when normal
⑥ - ④
③ - ④
② - ④
① - ④
Fan motor resistance check
Models SCM40, 45, 50, 60, 71, 80
Measuring point
⑥-④(Red - Blue)
③-④(Brown - Blue)
Notes(1) Remove the fan motor and measure it without power cnnected to it.
(2) If the measured value is below the value when the motor is normal, it means that the fan motor is fauly.
6 5 4 3 2 1
sub
(SCM100,125:
main
0
③ ② ①
③ ② ①
Outdoor main PCB
DC several (0 ‐ 6V)
DC15V
DC280V
DC15V
0 ‐ 6
DC several V( V)
DC several V( 0 ‐ 5 V)
Resistance when normal
20 MΩ or higher
20 kΩ or higher
)
main
Models SCM100,125
⑨ ⑧ ⑦
⑨ ⑧ ⑦
CNFAN
DC several (0 ‐ 6V)
Measuring point
① - ④
⑤ - ④
⑥ - ④
⑦ - ④
Models SCM100,125
Measuring point
①-④(Red - Blue)
⑤-④(Brown - Blue)
76
- -
'11 • SCM-SM-110
main
FM
0
⑥ ⑤ ④ ③ ② ①
⑥ ⑤ ④ ③ ② ①
Outdoor main PCB
GND
DC280V
DC15V
Resistance when normal
DC280V
DC15V
0 ‐ 6
DC several V( V)
DC several V( 0 ‐ 5 V)
Resistance when normal
20 MΩ or higher
20 kΩ or higher