Planet Audio ZR300.4

[Perry Babin]

It sounds like it may have an intermittently shorted power transformer.

 

[o. l. t.]

Seeing as it has stopped working again, I feel you may be right.

 

[Perry Babin]

With all power semiconductors clamped tightly to the sink and a 10 amp fuse in the B+ line, power the amp up and twist/push/pull on the transformer to see if it blows the fuse. If you have a current limiter (headlamp or large 2 ohm resistor), that would be better than the fuse. You'd have to monitor the voltage across the resistor with a meter to see if there are any changes in current draw.

 

[o. l. t.]

At the moment it won't even power up and it is getting 5v out the chip as it should so it's the +12 side that is not working properly I'd say. I dunno, about to chunk it out the window and forget it. Not worth it.

It works then don't, then works, then don't. Now nothing at all.

 

[Perry Babin]

Post the voltage on all of the pins on the 494.

 

[o. l. t.]

Actually you can hear the transformer make a tiny "tink" sound when you connect the remote. It's trying, but nothing is flowing. I think I have a bad capacitor.