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FDP Forum / Amp Mods, Repairs, and Projects / Noisy Frontman 212R

Roger Ball
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Canada

New guitars, old amps. Perfect.
Oct 25th, 2017 02:18 PM   Edit   Profile   Print Topic   Search Topic

Is anyone familiar with this amp? It belongs to the grandson of one of my bandmates and has a random static noise that comes and goes, sometimes loud. It is dead silent when there is nothing plugged into either input but gets noisy as soon as a cable or even just a plug is inserted. The level of the noise isn't affected by any control setting.

Looking around the board and poking with a chopstick the only thing I discovered was that a power resistor (R114) wasn't connected at one end but pushing the lead down through the board increased the background level a bit but didn't affect the noise issue. I'm not eager to disassemble the amp just for this issue.

I'm happy to give it back and recommend he take it to a real tech unless there's something easy I could try. These amps are not like the old ones I'm used to.

Any advice would be appreciated.



Peegoo
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Enjoying

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Oct 25th, 2017 03:10 PM   Edit   Profile   Print Topic   Search Topic

Sounds like a possible loss of ground connection at the input jack.

If you can get to the jack(s) solder connections on the board, look closely at them for cracks.

This is a fairly common problem on (1) amps that have the jacks soldered directly to the board and (2) are used by kids.

The "used by kids" aspect is due to kids being pretty hard on their gear, and guitar cables get yanked around while plugged into the amp. This stress on the input jack flexes the solder connections on the board and they fatigue and crack.

If nothing is physically broken, the simple fix is to re-flow the solder joints (use a dot of fresh rosin-core solder) at the jack's connections to the PC board.

Roger Ball
Contributing Member
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Canada

New guitars, old amps. Perfect.
Oct 25th, 2017 06:53 PM   Edit   Profile   Print Topic   Search Topic

That makes perfect sense. I'll give it a go tomorrow and report back.

Thanks, Peegoo!

willie
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Too Near Atlanta GA

Amp Tech Emeritus
Oct 26th, 2017 12:34 PM   Edit   Profile   Print Topic   Search Topic

That R114 I think is a load resistor in the negative speaker line. You may well have other solder failures in that amp, especially if it has been subjected to abuse (dropping it, banging it, etc...anything that might precipitate fractures in solder/lead junctions.

willie

Roger Ball
Contributing Member
**********
******

Canada

New guitars, old amps. Perfect.
Oct 26th, 2017 06:46 PM   Edit   Profile   Print Topic   Search Topic

I re-flowed the connections for the input jacks and repaired the R114 connection but no difference in the noise issue.

I'm not going to pursue this any further since I don't want to mess with it and possibly screw something up. At least I've learned how to take one of these things apart and re-assemble it. Not the most fun I've ever had.

On the positive side, the amp is now a lot cleaner than it was when I got it!

Thanks for the suggestions, guys.

FDP Forum / Amp Mods, Repairs, and Projects / Noisy Frontman 212R




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