Daikin FTKS20D3VMW, Service Manual

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Check SiENBE12-713
284 Service Diagnosis
6.1.13 Main Circuit Electrolytic Capacitor Check
Check No.14
"
Checking the main circuit electrolytic capacitor
!
Never touch any live parts for at least 10 minutes after turning off the circuit breaker.
!
If unavoidably necessary to touch a live part, make sure there is no DC voltage using the
tester.
!
Check the continuity with the tester. Reverse the pins and make sure there is continuity.
6.1.14 Turning Speed Pulse Input on the Outdoor Unit PCB Check
Check No.15
<Propeller fan motor>
Make sure the voltage of 320±30V is being applied.
(1) Stop the operation first and then the power, and disconnect the connector S70.
(2) Make sure there is about DC 320 V between pins 4 and 7.
(3) With the system and the power still off, reconnect the connector S70.
(4) Make a turn of the fan motor with a hand, and make sure the pulse (0-15 V) appears twice at
pins 1 and 4.
If the fan motor protection fuse is blown out, the outdoor-unit fan may also be in trouble. Check
the fan too.
If the voltage in Step (2) is not applied, it means the PCB is defective. Replace the PCB.
If the pulse in Step (4) is not available, it means the Hall IC is defective. Replace the DC fan
motor.If there are both the voltage (2) and the pulse (4), replace the PCB.
∗
Propeller fan motor : S70
Keep the tester in the
resistance measuring range.
When the pointer
swings, it means the
capacitor functions. If the pointer does not swing at all, or if it
swings all the way but does not return, it
means the capacitor malfunction.
1
2
3
4
5
6
7 DC320V
S70
PCB
Turning speed pulse input (0-15 V)
15V
(R5223)