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FDP Forum / Guitar Mods, Repairs, and Projects / Fisher preamp battery drain

6 Cylinder Slim

north woods

It just needs more voltage
May 6th, 2018 05:21 AM   Edit   Profile  

This is my first acoustic guitar with built in electronics. The unit drains batteries when the cable is unplugged. Is it most likely the strap jack/ switch?
Would it make sense to try to repair or just replace the jack? Is it possible the fault is something else inside the preamp? Thanks.

Peegoo
Contributing Member
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Always

trust your cape
May 6th, 2018 07:23 AM   Edit   Profile  

It could be several things.

You are correct...the jack is the first thing to check. Rather than replace it, remove it and check it with a meter to see if the internal switch is functioning properly.

Other possibilities are a sloppy solder joint causing a short in the circuit, or perhaps a stray wire whisker that’s bridging a gap and shorting the power.

The internal components of the preamp like these rarely fail to dead short because it’s a low-voltage circuit.

wrnchbndr

New Jersey

I'm back with the otters again
May 6th, 2018 07:59 AM   Edit   Profile  

Most guitars with active electronics like yours use the ring terminal on the jack to apply the negative side of the battery to ground when they're plugged in. When unplugged, the ring terminal on the jack should not be connected to ground. 90% of guitars with a battery work this way.

Then there are the 10% that get a little more complicated. Some employ an actual switch in the jack.

Breath deep, take your time. Figure out how its supposed to work before disconnecting wires.


6 Cylinder Slim

north woods

It just needs more voltage
May 6th, 2018 09:14 AM   Edit   Profile  

There is continuity from the input jack ring terminal to the coil spring that contacts the negative side of the battery with no phone plug connected. So, there's s short somewhere, hopefully in the jack. I've never seen one of these jacks before. YouTube showed me how to fish it out of the sound hole with a 1/4" dowel. I guess I'll take a look and see if there's anything I can do to fix it while it's still connected. After that, I'll be tempted to leave it be and just remember to remove the battery each time. Lazy me. Thanks for your replies.

Mick Reid
Contributing Member
*****

Australia

American-made in Oz!!
May 6th, 2018 04:01 PM   Edit   Profile  

Is it a new guitar with warranty?

If so I’d take it in for repair. If not, I’m sure you’ll be able to do it yourself. It would be a bummer to have to remove the battery every time.
Something as little as that would cause me to not play it as often as I might otherwise, and that would be a shame.


6 Cylinder Slim

north woods

It just needs more voltage
May 6th, 2018 08:30 PM   Edit   Profile  

It's not new. I'll take a look at the jack Maybe it's an easy fix and I'll learn something new. Sometimes you luck out.

ejm

usa

May 7th, 2018 06:33 AM   Edit   Profile  

Fisher?


Peegoo
Contributing Member
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Always

trust your cape
May 7th, 2018 06:39 AM   Edit   Profile  

Fishman.

We know what he means :o)

6 Cylinder Slim

north woods

It just needs more voltage
Jun 4th, 2018 03:38 PM   Edit   Profile  

Turned out to be a strange but easy repair. I fished the jack out of the sound hole with a dowel and found a second washer behind the nut on the contacts behind the jack. It was one of those washers with teeth that is supposed to grip the wood in front of the nut. Somehow, this second washer ended up on the wrong side of the nut and nobody bothered to remove it. I guess it slid up the wire and got caught up on the contacts. Snipped it off problem solved. No problem with the...Fishman...preamp.

Peegoo
Contributing Member
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A dog

in a cake shop
Jun 4th, 2018 04:55 PM   Edit   Profile  

Outstanding!

Super easy repair!

And there was no cutting out of the signal to clue you in to the weirdness? Strange indeed.

6 Cylinder Slim

north woods

It just needs more voltage
Jun 5th, 2018 10:08 AM   Edit   Profile  

Yeah, the signal worked fine. This was shabby workmanship though. Hard to imagine how it happened. Seems like once they realized the washer was on the wrong side of the nut, they would have simply swapped them around before they soldered on the jack. But here, they left it on the wires and added another in front of the nut. Weird, but that's what happened.

FDP Forum / Guitar Mods, Repairs, and Projects / Fisher preamp battery drain




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