Daikin Sensira Series - Page 98

2 | Components
Service manual
98
FTXF20~71A + FTXF20~25B + FTXF20~42C + ATXF20~71A + ATXF20~42C
+ RXF20~71A + RXF20~60B + RXF20~42C + ARXF20~71A + ARXF20~42C
Split Sensira R32
ESIE18-12E – 2021.02
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.
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99].
9 Turn ON the power of the unit.
10 With the DC fan motor connector S70 disconnected from the inverter PCB,
measure the voltage on the connector pins 4-7 (= fan motor power supply) on
the inverter PCB.
Result: The voltage MUST be 200~390VDC.
11 Measure the voltage on the connector pins 4-3 (= fan motor control) on the
inverter 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 inverter PCB,
see "2.7.1Checking procedures"[472].
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VDC. It should NOT be 0VDC.
Is the measured voltage 0VDC? Action
Yes Perform a check of the inverter PCB, see
"2.7.1Checking procedures"[472].
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.