38MGRBQ: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
50
E3/ PC 40 (Communication malfunction between IPM board and outdoor main control board) diagnosis (Cont)
Fig. 45 — E3/ PC 40
NOTE: Use a multimeter to test the DC voltage between black pin and white pin of signal wire. The normal value should be around 5V. Use a
multimeter to test the DC voltage between the black pin and red pin of signal wire. The normal value should be around 12V.
Fig. 46 — E3/ PC 40
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