SG-40MAHB-01: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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DIAGNOSIS AND SOLUTION (CONT)
Fig. 23 —Test the DC voltage
Use a multimeter to test the DC voltage between (2) terminal and (3) terminal of the outdoor unit. The red pin of the multimeter connects to the (2)
terminal while the black pin connects to the (3) terminal. When the air conditioner is running normal, the voltage moves alternately between
(approximately) -50V to 50V. If the outdoor unit malfunctions, the voltage moves alternately with a positive value. If the indoor unit malfunctions,
the voltage has a fixed value.
Fig. 24 —Test the Reactor resistance
Use a multimeter to test the reactor resistance which does not connect with the capacitor. The normal value should be around zero (0)
ohm. Otherwise, the reactor has malfunctioned and needs to be replaced.
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