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Check
SiUS121736EA
211
Service Diagnosis
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.
(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)
Æ
Defective PCB
Æ
Replace the PCB (control PCB).
If NG in step (2)
Æ
Defective Hall IC
Æ
Replace the indoor fan motor.
If OK in both steps (1) and (2)
Æ
Replace the PCB (control PCB).
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.
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)
1
Gray (power supply)
Purple (signals)
Blue (grounding)
2
3
(R14211)
S7
[Fig.1]
[Fig.2]
(R1736)
(R1444)
Содержание 4MXS-R Series
Страница 7: ...SiUS121736EA Table of Contents vi 3 Operation Limit 267...
Страница 23: ...SiUS121736EA Specifications 10 Part 2 Specifications 1 RA Indoor Unit 11 2 SA Indoor Unit 19 3 Outdoor Unit 22...
Страница 133: ...SiUS121736EA Wired Remote Controller BRC944B2 Remote Controller 120 6 Wired Remote Controller BRC944B2...