Blog

Haier DC Inverter Airconditioner Repair

Model 1U71SABFRA Not amateur radio related but might serve as a reference for someone, and a future reference for me as I have 4 of these. The indoor unit started giving an error E7 flashing on the display and no cooling or heating – the outdoor fan was not starting at all. I managed to […]

Icom IC-7300 Over Voltage Repair

Parts of this repair could also be valid if you reversed polarity to the radio, though the survival for reverse polarity should be better as a diode (marked C further down) should just blow the fuses on your DC cable. Now to the over-voltage bit…. A linear power supply without a crowbar protection circuit is […]


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