Specifications

Check SiUS12-928_A
157 Service Diagnosis
6.1.12 Main Circuit Electrolytic Capacitor Check
Check No.14  Never touch any live parts for at least 10 minutes after turning off the circuit breaker.
 If unavoidably necessary to touch a live part, make sure there is no DC voltage using the tester.
 Check the continuity with the tester. Reverse the pins and make sure there is continuity.
6.1.13 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. Disconnect 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 0 ~ 15 VDC.
5. Keep operation off and power off. Connect the connector S70.
6. Check whether 2 pulses (0 ~ 15 VDC) 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.
1
2
3
4
5
6
7
Actual rotating pulse output (0-15V)
15V
320VDC
Rotation command pulse input (0-15V)
S70
PCB