Hall Ic Check; Power Supply Waveforms Check - Daikin FTXN25KEV1B Service Manual

Check
5.2

Hall IC Check

Check No.04 1. Check the connector connection.
2. With the power on, operation off, and the connector connected, check the following.
If NG in step 1
If NG in step 2
If OK in both steps 1 and 2
The connector has 3 pins.
5.3

Power Supply Waveforms Check

Check No.11 Measure the power supply waveform between No. 1 and No. 2 on the terminal board, and check
the waveform disturbance.
Fig.1
88
∗
Output voltage of about 5 V between pins 1 and 3.
∗
Generation of 3 pulses between pins 2 and 3 when the fan motor is operating.
Defective PCB
Defective Hall IC
S7
1
2
3
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)
Replace the PCB.
Replace the fan motor.
Replace the PCB.
Gray (power supply)
Purple (signals)
Blue (grounding)
Fig.2
SiBE041102_A
(R14211)
Service Diagnosis