Sanyo 24KHS72 Service Manual - Page 51
Noise Malfunction and Electromagnetic Interference
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9-5. Noise Malfunction and Electromagnetic Interference An inverter A/C operates using pulse signal control and high frequencies. Therefore, it is susceptible to the effects of external noise, and is likely to cause electromagnetic interference with nearby wireless devices. A noise filter is installed for ordinary use, preventing these problems. However, depending on the installation conditions, these effects may still occur. Please pay attention to the points listed below. (1) Noise malfunction This refers to the application of high-frequency noise to the signal wires, resulting in abnormal signal pulses and malfunction. Locations most susceptible to noise Trouble Correction 1. Locations near broadcast stations where there are strong electromagnetic waves 2. Locations near amateur radio (short wave) stations 3. Locations near electronic sewing machines and arc-welding machines Either of the following trouble may occur. 1. The unit may stop suddenly during operation. 2. Indicator lamps may flicker. (The fundamental concept is to make the system less susceptible to noise.) - Insulate for noise or distance from the noise source. - 1. Use shielded wires. 2. Move unit away from the noise source. (2) Electromagnetic interference This refers to noise generated by high-speed switching of the microcomputer and compressor. This noise radiates through space and returns to the electric wiring, affecting any wireless devices (televisions, radios, etc.) located nearby. Locations most susceptible to noise Trouble Correction 1. A television or radio is located near the A/C and A/C wiring. 2. The antenna cable for a television or radio is located close to the A/C and A/C wiring. 3. Locations where television and radio signals are weak. 1. Noise appears in the television picture, or the picture is distorted. 2. Static occurs in the radio sound. 1. Select a separate power source. 2. Keep the A/C and A/C wiring at least 1 meter away from wireless devices and antenna cables. 3. Change the wireless device's antenna to a high- sensitivity antenna. 4. Change the antenna cable to a BS coaxial cable. 5. Use a noise filter (for the wireless device). 6. Use a signal booster. 51
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