LG HMC036KDT1 Service Manual - Page 35
Electronic, Parts, Troubleshooting, Guide
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Electronic Parts Troubleshooting Guide Electronic Parts Troubleshooting Guide 1. The Outdoor U (* Refer to Electronic Control Device drawing and Schematic diagram.) Turn off Main Power (After 10 seconds) Turn on Main Power ❑oes "beeping" sound is made from the Indoor Unit? ND YES Check the voltage of power(About AC 220V/AC240V, 60Hz) • Main power's voltage • Voltage applied to the unit • Connecting method of Indoor/Outdoor connecting cable - Check Fuse (Outdoor PCB Ass'y) • Check Varistor ZNRO1J(Outdoor PCB Ass'y) Primarily, the operating condition of Micom is OK. Check each load(Indoor/Outdoor Fan Motor, Compressor, Stepping Motor etc.) and contacting condition of related connector Check the connection housing for contacting • Connector related to CN-DCIAC • Display PWB Ass'y Check Items • Power Transformer (Outdoor unit) - Input Voltage - Output Voltage 4 • ICO1D(7812) Output (Indoor/Outdoor unit) • ICO2D(7805) Output (Indoor/Outdoor unit) 4 • ICO1A(KIA7036, Reset IC) X01(8MHz) PCB Board Operation Check Content Remedy - About AC220V/240V±- 10% - Check the power voltage - About AC14±3V • Replace Trans • DC +12V • Replace ICO1D • DC +5V • Replace ICO2D • Voltage of Micom No. 2, (DC +4.5V over) and Soldering condition. • Replace faulty parts Service Manual 35