Daikin FTXP20-71L, Service Manual

Page: 102 / 192

3 | Components
Service manual
102
ATXP20~35 + FTXP20~71 + ARXP20~35 + RXP20~71
Split Comfora R32
ESIE18-01E – 2023.01
Outdoor unit fan … Action
Does not rotate or rotates for a short
time Continue with the next step.
5 Turn OFF the unit via the user interface.
6 Turn OFF the respective circuit breaker.
DANGER: RISK OF ELECTROCUTION
Wait for at least 10 minutes after the circuit breaker has been turned OFF, to be sure
the rectifier voltage is below 10 V DC before proceeding.
7 Check that the DC fan motor connector is properly connected to the PCB.
8 Unplug the DC fan motor connector and measure the resistance on the
connector pins shown below. The measured resistance MUST be:
VDC Comm Resistance
1 4 71~79 Ω
1 7
4 7
10 (GND) 1 OL
4
7
11 1.96 kΩ
12 10.9 kΩ
13
INFORMATION
The measured resistance values may deviate from the listed values due to instability
during the measurements.
Are the measured resistance values
correct? Action
Yes Continue with the next step.
No Replace the DC fan motor, see "Repair
procedures" [
4
104].
9 Turn ON the power of the unit.
10 With the DC fan motor connector S71 disconnected from the main PCB,
measure the voltage on the connector pins 10-11 (= fan motor control) on the
inverter PCB.
Result: The voltage MUST be 15±10% V DC.
Is the measured voltage correct? Action
Yes Continue with the next step.
No Perform a check of the main PCB, see
"3.7.1 Checking procedures" [
4
84].
11 Connect the DC fan motor connector to the PCB. Remove the plastic insert
from the connector for easier measurement.