Service Manual

Check SiUS091133

143 Service Diagnosis

5.2 Fan Motor Connector Output Check

Check No.02 FTXS series

1. Check the connection of connector.

2. Check the motor power supply voltage output (pins 4 - 7).

3. Check the motor control voltage (pins 4 - 3).

4. Check the rotation command voltage (pins 4 - 2).

5. Check the rotation pulse (pins 4 - 1).

5.3 Hall IC Check

Check No.04 FDXS series

1. Check the connector connection.

2. With the power on, operation off, and the connector connected, check the following.

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.

If NG in step 1  Defective PCB  Replace the PCB.

If NG in step 2  Defective Hall IC  Replace the fan motor.

If OK in both steps 1 and 2  Replace the PCB.

(R12404)

Motor power supply voltage (310 ~ 340 VDC)

Unused

GND

Motor control voltage (15 VDC)

Rotation command voltage (1~ 5 VDC)

Rotation pulse input

Gray (power supply)

Purple (signals)

Blue (grounding)

(R14211)