Outdoor Unit Fan System Check; Power Supply Waveforms Check - Daikin FT25CV1A Service Manual

Si01-406
5.6

Outdoor Unit Fan System Check

Check No.9 DC motor — FT50/60CV1A
AC motor — FT25/35CV1A, FTY25/35CVMA
5.7

Power Supply Waveforms Check

Check No.10 Measure the power supply waveform between pins 1 and 3 on the terminal board, and check
the waveform disturbance.
[Fig.1]
Service Diagnosis
Check the outdoor unit fan system.
Outdoor unit fan running?
YES
Outdoor unit fan system
functioning.
Check the outdoor fan system.
Does the outdoor
fan rotate?
YES
Does
the outdoor unit fan
start just after the power
is turned on?
NO
Check to see if the power supply waveform is a sine wave (Fig.1).
Check to see if there is waveform disturbance near the zero cross (sections circled in Fig.2)
NO
Fan motor lead wire
connector disconnected?
NO
Go to Check No. 15.
Check the
NO
fan motor lead wire
connector for secure
connection.
Normal
Are the
YES
resistance at connector
leads ∞? 1. red - black,
2. white - black
NO
Check the fan
capacitor for continuity.
No continuity
[Fig.2]
YES
Reconnect.
(R2857)
Abnormal
Repair.
YES
Replace the fan motor.
Continuity
Replace the fan motor.
Replace the outdoor unit PCB.
The outdoor fan system is
normal.
Check
(R2670)
119