Dead Yamaha Stagepas300

This little PA wasn't making noise, and only seemed to power up for a few seconds. It's not really my field, but I thought I'd take a look since half of it belongs to me ... first observation is that something is rattling around inside. When I fish it out it appears to be part of a component case. Generally, this is a Bad Sign. Something has generated enough heat to blow fairly tought plastic resin apart.

I could read that it was a TOP249YN, which is a component that does some of the fancy switched-mode power supply stuff for you. I found a component with the missing front.



I snipped all but one of the legs off and heated the last leg while I pulled with a pair of long-nosed pliers. Then removed each stump in the same way. Then inserted the replacement component (bought from Farnell, so probably way too expensive for what it is - total $30NZD including postage?) making sure to apply heat-transfer compound and reattach to the heatsink. Soldered it up, and it worked. I'll let you know if it explodes again.

Basically we haven't had many problems with the unit over the past three years. It doesn't seem to plug into a PC for recording so well, get some funny artefacts in the recording.

But generally, a good unit and hope it keeps going for a few more years now.