Table of Contents
Check
8.3
Hall IC Check
Check No.04
CDXS, FDXS Series
1. Check the connector connection.
2. With the power on, operation off, and the connector connected, check the following.
8.4
Power Supply Waveform Check
Check No.11
Measure the power supply waveform between No. 1 and No. 2 on the terminal board, and check
the waveform disturbance.
[Fig.1]
211
(1) Output voltage of about 5 V between pins 1 and 3.
(2) Generation of 3 pulses between pins 2 and 3 when the indoor fan motor is operating.
If NG in step (1)
Defective PCB
If NG in step (2)
Defective Hall IC
If OK in both steps (1) and (2)
Check if the power supply waveform is a sine wave (Fig.1).
Check if there is waveform disturbance near the zero-cross (sections circled in Fig.2)
Replace the PCB (control PCB).
Replace the indoor fan motor.
Replace the PCB (control PCB).
S7
1
Gray (power supply)
2
Purple (signals)
3
Blue (grounding)
[Fig.2]
(R1736)
SiUS121736EA
(R14211)
Service Diagnosis
(R1444)
- Quick Links:
- Outdoor Unit
- Outdoor Unit
- Outdoor Unit
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Troubleshooting
