Check
SiSG121917E
175
Part 6 Service Diagnosis
8.8 Rotation Pulse Check on the Outdoor Unit PCB
Check No.16
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 4 - 3 is 15 VDC.
4. Check that the rotation command voltage between the pins 4 - 2 is 0 ~ 15 VDC.
5. Keep operation off and power off. Connect the connector S70.
6. Check whether 4 pulses (0 ~ 15 VDC) are output at the pins 4 - 1 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 outdoor unit PCB (main PCB).
If NG in step 4
Defective Hall IC
Replace the outdoor fan motor.
If OK in both steps 2 and 4
Replace the outdoor unit PCB (main PCB).
1
2
3
4
5
6
7
320 VDC
(R21120)
S70
Act
u
al rotation p
u
lse inp
u
t (0
~
15 VDC)
Rotation command
v
oltage (0
~
15 VDC)
Control
v
oltage 15 VDC
PCB
