Daikin Perfera ARXM R Series, Service Manual

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3 | Components
Service manual
147
RXM20~71R + ARXM25~71R + FTXM20~71R + ATXM25~50R +
FVXM25~50A
Split New Perfera R32
ESIE20-11 – 2021.01
8 Disconnect the DC fan motor connector S70 and measure the resistance on
the connector pins shown below. The measured resistance MUST be:
VDC Comm Resistance
1 4 >1 MΩ
2 4 >100 kΩ
3 4 >100 Ω
7 4 >100 kΩ
INFORMATION
The measured resistance values may deviate from the listed values due to instability
during the measurements.
DC fan motor resistance measurements
are correct? Action
Yes Continue with the next step.
No Replace the DC fan motor, see "Repair
procedures" [
4
148].
9 Turn ON the power of the unit.
10 With the DC fan motor connector S70 disconnected from the main PCB,
measure the voltage on the connector pins 4-7 (= fan motor power supply) on
the main PCB.
Result: The voltage MUST be:
Unit Voltage
Class 42~60 + ARXM71R 200~390 V DC
RXM71R 342~408 V DC
11 Measure the voltage on the connector pins 4-3 (= fan motor control) on the
main PCB.
Result: The voltage MUST be 15±10% V DC.
Are both measured voltages correct? Action
Yes Continue with the next step.
No Perform a check of the main PCB, see
"Checking procedures" [ 4 132].
12 Measure the voltage on the DC fan motor connector S70 pins 2-4 (= rotation
command) on the PCB.
Result: The measured voltage should be 0~7.5 V DC. It should NOT be 0 V DC.
Is the measured voltage 0 V DC? Action
Yes Perform a check of the main PCB, see
"Checking procedures" [
4
132].
No Continue with the next step.
13 Connect the DC fan motor connector to the PCB. Remove the plastic insert
from the connector for easier measurement.