AUX Air Conditioner Service manual
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2. No power supply（out of work completely）-tentative diagnosis
2.1. Check item
1) Does the input voltage is correct？
2) Does AC power wires connected correctly？
3) Does the output voltage of voltage stabilizer l7805 (ic2) is correct？
4) Does between indoor and outdoor unit communication is normal？
2.2. Fault diagnosis procedure
Note：There is according with an outdoor unit and two indoor unit.and a set of PCB. Please check them
accordingly.
1 Unplug the indoors and outdoors and re-plug after about 5 seconds
2 Listen if noise from buzzer or not?
3 Check the indoor power wire connection and the fuse are intact or not?
4 The outdoor PC board switched on communication signal or not?
5 Check the indoor/outdoor communication connection normal.or not?
6 Check the primary voltage of transformor
7 Check the transformor is normal or not?
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