SiEBE18-526 Check
Troubleshooting 325
Check No. 11 Check for Fan Speed Pulse Input on Outdoor Unit PC Board
(1) Disconnect the connector X206A with the power supply OFF and Operation OFF.
(2) Is the voltage between pins 4 and 3 of X206A about 15 VDC after turning the power supply
on?
(3) Is the voltage between pins 4 and 1 of X206A about 5 VDC?
(4) Connect the connector X206A with the power supply OFF and Operation OFF.
(5) When making one turn of the upper fan motor by hand after turning the power supply on, is a
pulse (0 and 5 V) generated 4 times between pins 4 and 1 of X206A? (Measure at the
contact terminal on the harness side with the connector connected.)
(6) Disconnect the connector X207A with the power supply OFF and Operation OFF.
(7) Is the voltage between pins 4 and 3 of X207A about 15 VDC after turning the power supply
on?
(8) Is the voltage between pins 4 and 1 of X207A about 5 VDC?
(9) Connect the connector X207A with the power supply OFF and Operation OFF.
(10)When making one turn of the lower fan motor by hand after turning the power supply on, is
a pulse (0 and 5 V) generated 4 times between pins 4 and 1 of X207A?
(2) (7): NO → Faulty PCB → Replace the PCB.
(3) (8): NO → Faulty PCB → Replace the PCB.
(5)(10): NO → Faulty Hall IC → Replace the DC fan motor.
(2) (3) (5) (7) (8) (10): YES → Replace the PCB.
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Fan speed pulse input (0V and 5V)
0V
15V
GND
NC
NC
250~350V(during operation)
(S2679)
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