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Check SiUS121827E
234 Part 6 Service Diagnosis
FFQ Series
1. Check the connection of connector.
2. Check motor power supply voltage output (pins 5 - 8).
3. Check motor control voltage (pins 5 - 4).
4. Check rotation command voltage output (pins 5 - 3).
8.3 Hall IC Check
Check No.04 FDXS, CDXS Series
1. Check the connector connection.
2. With the power ON, operation OFF, and the connector connected, check the following.
(1) Output voltage of about 5 V between pins 1 and 3.
(2) Generation of 3 pulses between pins 2 and 3 when the fan motor is operating.
If NG in step (1) → Defective PCB → Replace the PCB (control PCB).
If NG in step (2) → Defective Hall IC → Replace the fan motor.
If OK in both steps (1) and (2) → Replace the PCB (control PCB).
8
7
6
5
4
3
2
1
X20A
(R24373)
Motor power supply voltage (290 ~ 330 VDC)
Unused
Unused
GND
Motor control voltage (15 VDC)
Rotation command voltage (0 ~ 5 VDC)
Rotation pulse input
Unused
1
Gray (power supply)
Purple (signals)
Blue (grounding)
2
3
(R14211)
S7
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