Power Transistor Check; Main Circuit Electrolytic Capacitor Check - Daikin F-Series Service Manual

SiEN12-710A

5.1.12 Power Transistor Check

Check No.13
" Checking the power transistor
! 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 the power transistor's supply
! For the UVW, make measurements at the Faston terminal on the PCB or the relay
Tester's negative terminal Power transistor
Tester's positive terminal
Normal resistance
Abnormal resistance

5.1.13 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
! Check the continuity with the tester. Reverse the pins and make sure there is continuity.
Service Diagnosis
voltage is below 50 V using the tester.
connector.
tester.
Keep the tester in the
resistance measuring range.
When the pointer swings,
it means the capacitor
functions.
UVW
(+)
Power transistor
UVW
(+)
Several kohms to several Mohms
If the pointer does not swing at all,
or if it swings all the way but does
not return, it means the capacitor
malfunction.
Power transistor
(–)
Power transistor
UVW
0 or ∞
Check
UVW
(–)
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