Help with L-07m Please!!!

Just got a pair of L-07M amps and 1 works great, the other blow's the 250 volt
.1 amp fuse at power up. Are there any common problems to look for?
Any help would be greatly appreciated!

Thanks all.

We'll assume that you haven't swapped the fuses...that the 5A fuse and the .1A fuse are both in their proper place.

The circuit that the small fuse supplies simply triggers the main power relay. This consists of the small transformer, a diode bridge, two 100µf caps, and the power relay with it's associated kickback diode. I'd desolder the bridge and do a diode check on it, as the most likely failure is the diode bridge or the kickback diode. A plain 1N4004 will work for the kickback diode (Dz1) and although I can't check on the pin spacing, it looks like Digikey #KBP02G-ND might fit OK for the bridge (Dz6). The Digikey part has a pin spacing of about 3.75mm.

And yeah, I'd replace the electrolytic caps on that board as well.

Thank you EW!!! All of the fuses are original, I got some new ones today, and will test where you said to.

Thanks again!!

Fixed!!! Diode.

Thank you EW!!!!

Cool. :yes:

Nice!

I really, really, really, really, really want a pair of those.

I think it's going to be time to do an overhaul on mine soon, I imagine googling "EchoWars" and "L-07M" will provide me with all of the info I need....