Daikin Air Conditioner RX36NMVJU

Voltage applied (320 + 100 V ~ 320 - 50 V)

Set operation off and power off. Disconnect the connector S70 or S71

Voltage between the pins 4 - 7 (320 VDC)

Control voltage between the pins 4 - 3 (15 VDC)

Rotation command voltage between the pins 4 - 2 (0 ~ 6.5 VDC)

Keep operation off and power off. Connect the connector S70 or S71

Rotation pulses (0 ~ 15 VDC) at the pins 4 - 1 when the fan motor is rotated 1 turn by hand

Check if 4 rotation pulses are input

Sign off on the rotation pulse check

Warning: Ensure the voltage between (+) and (-) of the diode bridge (DB1) is approximately 0 V before proceeding

Enter the voltage between (+) and (-) of the diode bridge (DB1)

Is the voltage approximately 0 V?

If voltage is not approximately 0 V, stop the procedure and report the issue

Enter the resistance between the pins of the DB1

Is the resistance less than 1 kOhm?

If resistance is less than 1 kOhm, a short circuit occurs on the main circuit

Sign off on the main circuit short check

Warning: This procedure requires trained personnel with PPE!

Main circuit checked for short circuit?

Warning: Never touch any live parts during the procedure.

Note: The surface of the test points (DC–) may be covered with the coating.

Firm contact between the multimeter probes and the test points?

Sign off on the capacitor voltage check

Warning: This check requires trained personnel with PPE!

Measure the power supply waveform between No. 1 and No. 2 on the terminal board

Is the power supply waveform a sine wave?

Is there waveform disturbance near the zero-cross?

Sign off on the power supply waveforms check

Check the connection of connector

Check the motor power supply voltage output

Check the motor control voltage

Check the rotation command voltage

Sign off on the connector output check