Fan Motor Connector Check; Hall Ic Check; Power Supply Waveform Check - Daikin Super Multi NX FFQ25B8V1B Service Manual

SiBE121021_C
8.2

Fan Motor Connector Check

Check No.02 1. Check the connection of connector.
2. Check motor power supply voltage output (pins 4 - 7).
3. Check motor control voltage (pins 4 - 3).
4. Check rotation command voltage output (pins 4 - 2).
5. Check rotation pulse input (pins 4 - 1).
8.3

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
8.4

Power Supply Waveform 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]
Service Diagnosis
S1 or S200
7
6
5
4
3
2
1
∗
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
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)
Motor power supply voltage (310 ~ 340 VDC)
Unused
Unused
GND
Motor control voltage (15 VDC)
Rotation command voltage (1~ 5 VDC)
Rotation pulse input
Replace the PCB.
Replace the fan motor.
Replace the PCB.
S7
1 Gray (power supply)
2
Purple (signals)
3
Blue (grounding)
[Fig.2]
(R1736)
(R14225)
(R14211)
Check
(R1444)
363