Repair of BIEMA W220 MK2 Amplifier
Fault - Shuts down after a few minutes of operation
Removed top cover and checked out the temp sensing switches on the heatsink, the one on the left is N/O 50 deg C and the one on the right is N/C 90 deg C
Found the 50 deg C N/O switch to be faulty, this switch controls the cooling fans and as a result the fans were not working at all
Fitted a new temp switch
Fixed the new switch to the heatsink (to gain access to the side of the heatsink allowing removal and replacement of the switches you have to lift the PCB out of the case unplugging various cables, then re-assemble.
Re-tie wrapped cable looms
Re-fitted top cover
Tested unit - both channels @ 360w RMS fans now working - all ok
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