Mitsubishi SCM40ZS-S Technical Manual page 220

(a) Inspection of electronic expansion valve
(i)
(ii)
(iii)
(iv)
• Inspection of electronic expansion valve as a separate unit
Measuring point Resistance when normal
(b) Outdoor fan motor check procedure
(i) Outdoor main PCB output check
outdoor
Models SCM40, 45
FM
⑥ ⑤ ④
⑥ ⑤ ④
CNFAN
GND
DC280V
DC15V
(ii) Fan motor resistance check
Models SCM40, 45
Measuring point
⑥-④(Red - Black)
③-④(White - Black)
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
②
main
main
0
③ ② ①
③ ② ①
Outdoor main PCB
DC several (0-6V)
Measuring point
⑥ - ④
③ - ④
② - ④
Resistance when normal
20 MΩ or higher
20 kΩ or higher
DC
source
Model SCM50
⑥
⑥
CNFAN
DC280V
Resistance when normal
DC280V
DC15V
DC several V( 0-6 V)
Model SCM50
Measuring point
⑥-④(Red - Blue)
③-④(Brown - Blue)
219
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'16 • SCM-T-199
main
FM
0
⑤ ④ ③ ② ①
⑤ ④ ③ ② ①
Outdoor main PCB
DC several (0-6V)
GND
DC15V
Resistance when normal
20 MΩ or higher
20 kΩ or higher