Daikin VRV II RXYQ8MY1K Service Manual page 244

Si39-502A
Check No. 1 Check on pulse input of position signal of fan inverter PC board
(1) Disconnect the connector X2A while power supply OFF and operation OFF.
(2) Is the voltage between pins No. 4 and 5 on X2A approx. 15 V after power supply is turned
(3) Connect the connector X2A while power supply OFF and operation OFF.
(4) Check below conditions when the fan motor is rotated one turn manually under the condition
The condition (2) dose not appear → Faulty PC board → Replacing the PC board
The conditions (4) do not appear → Faulty hall IC → Replacing fan motor of outdoor unit
Troubleshooting
on?
of operation OFF after power supply is turned ON.
Are the pulse (approx. 0 V and 5 V) generated 4 times between No. 1 and 5 on X2A?
Are the pulse (approx. 0 V and 5 V) generated 4 times between No. 2 and 5 on X2A?
Are the pulse (approx. 0 V and 5 V) generated 4 times between No. 3 and 5 on X2A?
5 Gray
4 Pink
3 Orange
2 Blue
1 Yellow
Troubleshooting (OP: Unified ON/OFF Controller)
GND
Vcc (approx. 15 V)
Position signal W
Position signal V
Position signal U
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