Check
SiMT041311E
187
Service Diagnosis
3.9
Rotating Pulse Check on Outdoor Unit PCB
Check No.16
Outdoor fan motor: S70
Humidifier fan motor: S72
Make sure that the voltage of 320 ± 30 V is applied.
1. Set operation off and power off. Disconnect the connector S70 or S72.
2. Check that the voltage between the pins 4 - 7 (S70) or the pins 5 - 8 (S72) is 320 VDC.
3. Check that the control voltage between the pins 3 - 4 (S70) or the pins 4 - 5 (S72) is 15 VDC.
4. Check that the rotation command voltage between the pins 2 - 4 (S70) or the pins 3 - 5 (S72)
is 0 ~ 6.5 VDC.
5. Keep operation off and power off. Connect the connector S70 or S72.
6. Check whether 4 pulses (0 ~ 15 V) are output at the pins 1 - 4 (S70) or the pins 2 - 5 (S72)
when the fan motor is rotated 1 turn by hand.
If NG in step 2
→
Defective PCB
→
Replace the outdoor unit PCB.
If NG in step 4
→
Defective Hall IC
→
Replace the corresponding fan motor.
If OK in both steps 2 and 4
→
Replace the outdoor unit PCB.
(R19735)
1
2
3
4
5
6
7
2
3
4
5
6
7
8
S70
S72
Actual rotating pulse output (0 ~ 15 VDC)
Rotation command pulse input (0 ~ 6.5 VDC)
15 VDC
320 VDC
PCB
