Daikin Emura RXJ20A5V1B Service Manual page 129

To check the rectifier voltage of the main PCB
To perform a diode module check
RXJ20~50A + FTXJ-A(W)(S)(B)
Split Emura 3 R32
ESIE22-04B – 2022.08
Prerequisite: First perform all earlier main PCB checks, see
4
procedures" [ 126].
1 Turn ON the power of the unit.
2 Measure the voltage on the rectifier voltage check terminals (+ and –) on the
main PCB.
Result: The measured voltage MUST be approximately 300~350 V DC.
a
a + terminal
b – terminal
INFORMATION
When measuring on the front of the main PCB, make sure to locally remove the
protective varnish with the test leads of the multi meter.
Is the measured rectifier voltage
correct?
Yes
No
1 First check the rectifier voltage of the main PCB, see
4
procedures" [ 126].
INFORMATION
If the rectifier voltage is OK, the diode module is OK. If rectifier voltage is NOT OK,
replace the main PCB.
Below procedure describes how to check the diode module itself.
Prerequisite: Stop the unit operation via the user interface.
2 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.
3 Check the diode module in reference with the image and the table below.
b
Action
Perform a check of the power module,
see "Checking
Replace the main PCB, see
procedures" [
4 Components
|
"Checking
4
procedures" [ 126].
"Repair
4
131].
"Checking
Service manual
129