Daikin FTXA20A, Service Manual

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2 | Components
Service manual
95
FTXA20~50A(W)(S)(T) + FTXA20~50B(B)(S)(T) + RXA42+50A +
RXA20~35A(9) + RXA42+50B
Split Stylish R32
ESIE18-03D – 2021.05
Is the measured rectifier voltage
correct? Action
Yes Perform a check of the power modules,
see
"Checking procedures" [
4
91].
No Replace the main PCB, see "Repair
procedures" [
4
98].
To perform a diode module check
1 First check the rectifier voltage of the main PCB, see "Checking
procedures" [
4
91].
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.
a
d
b
c
a d
b
c
a V DC out (+)
b V AC in
c V AC in
d V DC out (–)
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.
VDC Com Ref VDC Com Ref
d b 0.51~0.52 V b d O.L
b a 0.51~0.52 V a b O.L
d c 0.51~0.52 V c d O.L
c a 0.51~0.52 V a c O.L
4 If the diode module is NOT OK, replace the main PCB, see "Repair
procedures" [ 4 98].