Repair of Mordaunt Short MS309W, Active Powered Subwoofer with 8" Aluminium Driver
Fault - Customer reported no output,
The customer had taken the active amplifier chassis and back panel out of the main speaker cabinet to save on shipping,
On test found that there was an output but there was a high frequency component riding on the output waveform.
Removed the back cover from the amplifier assembly , on inspection found that the 2 x 10uf 100V bipolar capacitors that sit on the output were burst and had ejected dielectric all over the surrounding area of PCB, (see top left below)
Cleaned up PCB fitted 2 new 10uf 100v Bi Polar capacitors, refitted the PCB and tested
As can be seen the waveform is now crystal clear with no high frequency component visible
Refitted the back cover and tested unit for 4 hours all ok
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