Mitsubishi Heavy Industries SCM71ZM-S1 Technical Manual page 224

(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 unit fan motor check procedure
(i) Outdoor main PCB output check
outdoor
Models SCM71, 80
⑥ ⑤ ④
⑥ ⑤ ④
CNFAN
GND
DC280V
Measuring point
⑥ - ④
③ - ④
② - ④
(ii) Fan motor resistance check
Models SCM71, 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
②
main
main
FM
0
③ ② ①
③ ② ①
Outdoor main PCB
DC several (0-6V)
DC15V
Resistance when normal
DC280V
DC15V
DC several V( 0-6 V)
Resistance when normal
20 MΩ or higher
20 kΩ or higher
DC
source
223
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'17 • SCM-T-225
main