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FDP Forum / Fender Amps: 1985 - Current / TAP button come on

fender213

USA

Marcus Swicegood
Feb 8th, 2019 12:34 AM   Edit   Profile  

I need some help here. I have a 2016 Fender Champ 100 amp Bought it brand spanking new, love this amp! But Sometimes when i want to play on chann #1 sorta clean w/effects light on the stomp switch The TAP button will engage & start to function when i don't want it to!!! I got a little pissed @ practice one night & done a solid hammer fist to the top of the case, and it stopped! I know thats not right! but it keeps coming on sometimes, & i will hit the top of the case and it will stop blinking and doing it thing. Has anyone heard of this happening? I hope its just operators head space to save me the cost of a repair bill

pcalu

usa Thumb area Mi

Feb 9th, 2019 07:00 PM   Edit   Profile  

Solid hammer fist? Nice... lol

$379 New for a solid state amp.

What did you expect?

When (not if) that amp goes, the repair cost will be half or 3/4 the cost new. (If it can be repaired)

Mustangs, Champs, Acoustasonic, Acoustic 200 & 100. you get what you get. The price reflects this.



willie

Too Near Atlanta GA

Amp Tech Emeritus
Feb 9th, 2019 07:22 PM   Edit   Profile  

Sounds like a solder joint fracture...Repair by a tech familiar with this type of amp isn't all that much. Required disassembly and close inspection with a lighted magnifier...find the flaw, reflow the solder...test and reassemble and final test. Usually an hour labor charge.

willie

Peegoo
Contributing Member
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Just beyond Mars

there's a world of fools
Feb 9th, 2019 08:09 PM   Edit   Profile  

Willie to the rescue!

The foot switches and circuits for control of these amps operate using voltage differentials. A poor connection created by a fractured solder joint does exactly what stepping on a footswitch does.

willie

Too Near Atlanta GA

Amp Tech Emeritus
Feb 10th, 2019 08:39 AM   Edit   Profile  

It does indeed my friend...

Long,long ago when I was an apprentice in a TV repair shop in Jacksonville Florida (ca.'63), the old head TV repair bench jockeys always told me that if something electrical changes when you bang on a chassis or cabinet then the problem is most likely a mechanical connection....that is, a joint, switch contact or other electro/mechanical contact.

willie

fender213

USA

Marcus Swicegood
Feb 25th, 2019 04:41 AM   Edit   Profile  

Thanks guys for feedback, I was thinking a loose connection had to be the problem!! I'm a retired Electrical Lineworker of 30 years service.I Just was hoping i needed to turn a knob a different way or something. BUT, not to" jinks" myself, which i don't believe in anyway !!!!! I got to cooking some food tonight and started my gear about 30 mins prior to let things get room temp, i was sorta side tracked too say,Got harnessed up to play & the amp performed perfect! after a little warm up time. Who knows about electronics? It Might make a good boat anchor some day. Like keeping a band together. Trying to herd cats!! Out Marcus

Peegoo
Contributing Member
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Just beyond Mars

there's a world of fools
Feb 25th, 2019 07:29 AM   Edit   Profile  

Marcus, if you know how to safely work around electronics, you can pop open that amp, trace the foot switch control circuit on the amp's schematic, and then take a really close look at those components and PCB traces in the chassis.

I'll bet you find a dodgy (or cracked) solder connection.

And it might be as simple as a loose/weak connection between the foot switch plug and jack on the rear panel.

(This message was last edited by Peegoo at 09:32 AM, Feb 25th, 2019)

willie

Too Near Atlanta GA

Amp Tech Emeritus
Feb 25th, 2019 01:07 PM   Edit   Profile  

Yeah...intermittent operation (doesn't work right, then works perfect, etc) is one of the hallmarks of bad solder connections. Finding them in a PCB type amp can be challenging...but quite doable.

w

FDP Forum / Fender Amps: 1985 - Current / TAP button come on




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