Daikin RZQ100B8V3B Service Manual page 261

ESIE05-03
5.9.3 Outdoor unit: Fan Speed Pulse
For RZQ71~140 models
(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
For RZQ100~140 models
(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
(2) (7): NO → Faulty PC board → Replace the PC board.
(3) (8): NO → Faulty PC board → Replace the PC board.
(5)(10): NO → Faulty hall IC → Replace the DC fan motor.
(2) (3) (5) (7) (8) (10): YES → Replace the PC board.
Part 3 – Troubleshooting
(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.)
(0 and 5 V) generated 4 times between pins 4 and 1 of X207A?
1
2
3
4
5
6
7
Additional Checks for Troubleshooting
Fan speed pulse input (0V and 5V)
0V
15V
GND
NC
NC
250~350V(during operation)
1
3 3
4
5
(S2679)
3–113