Daikin Indoor Unit Wall Mounted Type FTXS35D3VML

Check No.10: Power Supply Waveforms Check

Measure the power supply waveform between pins 1 and 3 on the terminal board

Check to see if the power supply waveform is a sine wave (Fig.1)

Check to see if there is waveform disturbance near the zero cross (sections circled in Fig.2)

Sign off on the power supply waveforms check

Warning: Never touch any live parts for at least 10 minutes after turning off the circuit breaker.

If unavoidably necessary to touch a live part, make sure the power transistor's supply voltage is below 50 V using the tester.

Enter the supply voltage of the power transistor

Measurements at the Faston terminal on the board or the relay connector successful?

Sign off on the power transistor check

Voltage of 320±30V is being applied

Stop the operation first and then the power, and disconnect the connector S70

With the system and the power still off, reconnect the connector S70

Turn of the fan motor with a hand, and make sure the pulse (0-15 V) appears twice at pins 1 and 4

Is the fan motor protection fuse blown out?

If the fan motor protection fuse is blown out, the outdoor-unit fan may also be in trouble. Check the fan too

Is the voltage in Step (2) not applied?

Warning: Ensure the power is off before starting the procedure

Continuity of the switch connection checked

Can the shutter be opened and closed with hand?

Sign off on the limit switch continuity check

Warning: Be sure to wait 10 minutes or more after turning off all power supplies before disassembling work.

Remove the fan motor fixing plate.

Remove the outer panels and plates.

Take out the fan motor fixing plate toward yourself.

When assembling, fit the lower hooks.

Loosen the washer fitted nut to remove the propeller fan.

When assembling, align mark of the propeller fan with D-cut section of the motor shaft.

When assembling, make sure ! mark of the fan motor goes up.