Mission 705a active bass speaker blowing both fuses on startup

[markreed89]

Hi, so I've got a pair of Mission speakers with active bass. There's an amplifier board with a crossover that amplifies the bass drivers. both speakers were buzzing due to swollen capacitors. I'm a complete electronics novice with just some basic soldering skills but I managed to replace all the caps on them successfully and they were running great but the one speaker after ten minutes suddenly blew it's fuses. It now blows them the moment it's powered up. I tried swapping the filter caps around between the speakers, and a few other bits but I still can't get the ones speakers fuses to stop blowing. I cant find any obvious cause, nothing looks burnt etc. I've posted some photos below so you can see what I'm dealing with.

Thanks

Mark

 

[mbarazeen]

check the rectifier diodes for short circuit (D401-404)