Please Help me fix my Marshall G30R CD (similar to MG series)

[tomer629]

I pulled this amp out of a closet to give it to my 10 year old nephew who just bought his first guitar. He was very excited to have a Marshall amp. Only problem is he was really let down when we plugged it in and there was no sound.

I have a little experience with guitar and amp electronics but I havent had to fix anything in a few years and Im a little rusty.


Ok here is whats wrong...

No sound on either channel, if I crank it up and play through it I can hear my signal coming through just BARELY. It is there but its extremely quiet. It also sounds like its drenched in reverb. Could it be a problem with the spring reverb? I opened it up and there are no obvious bad connections, heat damage, etc...

This amp worked last time I tried it, then I put it in a closet for 2 years and now there is no sound, any Ideas? Im not afraid to go at it with a soldering iron if I have too. Can I just bypass the reverb tank if thats the problem.

Thanks for any help, If I can get this thing working it will make a little boy very happy.

[Gtr_tech]

There's a headphone jack right? Try plugging/unplugging a cable into that jack repeatedly. Pwr up....any better now? My guess is that jack has become unable to pass the spkr ground connection due to sitting around/dirt/oxidation.

If that trick improved the situation, turn the amp upside down and spray some contact cleaner into that jack. Then do the plug/unplug thing all over again. That should take care of it as long as the jack's contacts have maintained their springy-ness and are able to make the normally closed connection. The solder connections could be cracked as well, but if the headphone jack was never/rarely used I doubt thats the issue.

[Enzo]

The reverb is not the problem.