Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Instruments and Amps Everything that makes music, Especially including instrument amps.

Fender FM 212 popping sound when switching off
Fender FM 212 popping sound when switching off
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 9th January 2012, 05:45 PM   #1
nilhegar is offline nilhegar
diyAudio Member
 
Join Date: Jan 2012
Default Fender FM 212 popping sound when switching off

Hello,

I have a 5-6 year old Fender FM 212R solid state guitar amp which had some problems recently. After a gigging, it started to make crackling noises even if every volume pots were turned down, it did it with every cable, with or without any guitars. Also, it made a loud popping sound when switching off the amp, regardless of the volume settings, it made that sound even if the amp is muted (no jacks plugged in). The crackling noises could be summoned by hitting the top of the amp, so I thought that there are some broke solders inside. So I disassembled the amp, and fixed these issues. Voila, the crackling noises gone, but the loud pop when switching off it remained..

Does anybody have some clue what could be the problem?

Thanks in advance!

Tom
  Reply With Quote
Old 9th January 2012, 11:39 PM   #2
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
This isn't the first amp to pop when you turn it off, nor will it be the last. Power-off pops are extremely common, and I don;t consider them problems or defects.
  Reply With Quote
Old 10th January 2012, 08:07 AM   #3
nilhegar is offline nilhegar
diyAudio Member
 
Join Date: Jan 2012
Thanks for the reply!

I have another 212 combo and two fm100h heads with 412 cabinets, and none of them makes this popping sound. I want to repair it, because we run a rehearsal room and a bad amp makes bad reputation for us. Does anybody have any idea how to repair it?
Thanks!
  Reply With Quote
Old 10th January 2012, 08:48 AM   #4
Enzo is offline Enzo  United States
diyAudio Member
 
Join Date: Sep 2004
Location: Lansing, Michigan
OK then. Leave the power switch ON, but unplug the amp from the wall. Does it still pop that way? Electrically the two methods - switch of pull cord - are the same.

If that still pops, then your pop is likely a turn-off thump. That can be a million things.

If that does not pop, then your power switch is sparking and the amp circuit picks that up as power dies away. A cap across the switch might help, or even just a different switch. Should be easy enough to wire in a different switch to see if that changes things.

Does the amp behave properly otherwise?
  Reply With Quote

Reply


Fender FM 212 popping sound when switching offHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Zenith K731 AM/FM radio audio random cracking sound in FM mode AC439 Tubes / Valves 15 20th February 2009 09:06 PM
Fender twin reverb farts out after switching to standby frickecello Instruments and Amps 2 19th July 2008 06:52 AM
Fender Hotrod Deville 212 e_c_mccollum Instruments and Amps 1 7th April 2007 04:35 PM
woofer popping sound caw Chip Amps 3 14th June 2006 11:33 AM
Not really a DIY question. Popping when switching inputs. mattjk Pass Labs 5 1st January 2005 12:45 PM


New To Site? Need Help?

All times are GMT. The time now is 06:46 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki