REPAIR SHOP 

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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