The fuse blew in my amplifier. I replaced it but the new fuse blew as soon as I turned the power on. Does anyone know what else I should check or what might be the cause of the problem?
The amp is a Marrantz pm32 integrated stereo amplifier. I used the correct rating on the fuse I replaced (250V 1.0A). I can't find a service manual for this amp online.
2007-09-25 01:36:18 · 4 answers · asked by samthesuperfurryanimal 3 in Science & Mathematics ➔ Engineering
Thanks for all the answers so far! Just a couple of extra notes:
1. I think the problem is with the power supply stuff, not the audio.
When I used to press the power button, the red power LED would light up and after a few seconds there was a 'click' sound. Now that it's broken neither of these things happen.
2. When mentioning parts, please could you tell me what it is, what is does, what it might look like etc? I don't really know what any of the interior parts are called but can should be able to work out what you mean with a few clues.
Thanks :)
2007-09-27 01:28:00 · update #1
What usually blows in a power amplifier is the power supply capacitors. They are the large electrolytics that just get tired of all the inrush current and short. You can usually see the bad ones by looking at the shrink tubing surrounding them and as the capacitor heats up as it goes bad, the shrink tubing pulls away from the top and no longer covers over the edge of the top. In the extreme they explode from the top through the cuts that are the strain relief.
Forget the fuse. It is doing its job.
You could also have a shorted bridge rectifier in the power supply. This is usually square with four terminals. If it goes bad it often swells and cracks.
These are good places to start.
2007-09-30 13:22:21 · answer #1 · answered by Warren W- a Mormon engineer 6 · 0⤊ 0⤋
If you used the proper fuse rating even high output should work.
I would suggest that you look for a problem in the power supply.
A shorted resistor,capacitor or voltage regulator.
You'll need a meter and maybe a scope.
2007-09-25 02:00:43 · answer #2 · answered by Billy Butthead 7 · 1⤊ 0⤋
You probably had it cranked up too loud, and blew the output.
This will be the thing that is black, and is attached to the shiny metel thing with fins.
you will probably have two or four of the outputs.
Take it into local repair shop, will run you about 150.
2007-09-25 01:40:21 · answer #3 · answered by ? 3 · 2⤊ 0⤋
my suggestion is a shorted main rectifier diode(s).
2007-09-25 11:36:50 · answer #4 · answered by lare 7 · 0⤊ 0⤋