Check SiUS04-904
Service Diagnosis 151
5.1.13 Rotating Pulse Input on the Outdoor Unit PCB Check
Check No.15 Outdoor fan motor
Make sure that the voltage of 320 ± 30 V is applied.
1. Set operation OFF and power OFF. Remove the connector S70.
2. Check that the voltage between the pins 4-7 is 320 VDC.
3. Check that the control voltage between the pins 3-4 is 15 VDC.
4. Check that the rotation command voltage between the pins 2-4 is 5 VDC.
5. Keep operation OFF and power OFF. Connect the connector S70.
6. Check whether 2 pulses (0 - 15 V) are output at the pins 1-4 when the fan motor is rotated 1 turn
by hand.
When the fuse is melted, check the outdoor fan motor for proper function.
If NG in step 2 Defective PCB Replace the PCB.
If NG in step 4 Defective Hall IC Replace the outdoor fan motor.
If OK in both steps 2 and 4 Replace the PCB.
5.1.14 Hall IC Check
Check No.16 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 faulty PCB Replace the PCB.
If NG in step 2 faulty Hall IC Replace the fan motor.
If OK in both steps 1 and 2 Replace the PCB.
To Next Page
Loading...
