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FDP Forum / Miscellaneous and Non-Fender Topics / What's the diagnosis?

Charente
Contributing Member
****

France

Aug 19th, 2017 11:22 AM   Edit   Profile   Print Topic   Search Topic

I have a Joyo Vintage Overdrive pedal (TS clone). As a drive I find it a little 'meh' but I don't have Fender voiced amp so maybe that's why. On the other hand, set right, it does a reasonable job of emumlating a treble boost paired with my little Marshall JTM1 stack. So I want to keep it around.

Thing is, last night I replaced the battery and tried to plug in. Couldn't get the lead into the output jack at all but drawing on decades of technical expertise (brute force and ignorance) it eventually went in - but no sound.

Now with just the input lead from the guitar plugged in the LED switches on and off but no sound (obviously). With input and output leads plugged in the LED doesn't toggle but it's either no sound or the amp's unaffected sound (the drive vol and tone knobs have no effect). The latching footswitch must be doing something then so that's not the problem.

The obvious thing to do is pull it apart but I'm kind of frazzled after the last few days and I thought there's some experienced intelligent folks here who'll know straight off what the problem is.

PS - It's Chinese isn't an acceptable answer.

SonicBlue

Sunbury-on-Thames

Aug 19th, 2017 11:38 AM   Edit   Profile   Print Topic   Search Topic

The force used to push in the output lead may have broken the jack off the PCB, that's if it's a PCB mounted socket of course.

Therealfrogman
Contributing Member
*****

Pueblo, Co

Relics produce tone, man.....
Aug 19th, 2017 11:53 AM   Edit   Profile   Print Topic   Search Topic

I am holding a Joyo PCB in my hand right now and I own several of these Joyo pedals, they all have the jacks attached to the board and they are not as simple as a standard guitar jack.


Attached is a picture of what it probably looks like.

BTW, that Nocaster in your profile is calling my name!

I would venture to guess that perhaps one of clips got dislodged or the entire jack has shifted.

External link

(This message was last edited by Therealfrogman at 02:06 PM, Aug 19th, 2017)

Charente
Contributing Member
****

France

Aug 19th, 2017 12:05 PM   Edit   Profile   Print Topic   Search Topic

"The force used to push in the output lead may have broken the jack off the PCB"

That sounds likely.

Peegoo
Contributing Member
**********
**********
******

The rain sounds like

a round of applause
Aug 19th, 2017 01:08 PM   Edit   Profile   Print Topic   Search Topic

Another possibility is those fake Cliff-type switching jacks they use are often a bit sloppy on the fit.

If your cable plug has even a little bit of a shoulder on it at the tip/sleeve insulating washer, that shoulder can hang up on the internal contacts and bend 'em.

Check the solder connections on the board first (as described above).

If they look okay, stick a cable into the jack and use a meter to test across the jack's solder tabs and the other end of the cable (the plug).

That should tell you where the fault is.

Pinetree
Moderator Emeritus
(with many stars)

NW Pennsylvania

Aug 19th, 2017 02:08 PM   Edit   Profile   Print Topic   Search Topic

A photo of the innards would help.



Charente
Contributing Member
****

France

Aug 20th, 2017 08:37 AM   Edit   Profile   Print Topic   Search Topic

Thanks Therealfrogman. That's exactly what the innards are like and yes the Nocaster is pretty nice.

The problem is now sorted. It turned out to be more a simple mechanical issue than electrical.

What must have happened, probably when I changed the battery was that the battery wire must have got caught in the output jack contacts and when I forced the jack plug in it nipped a little insulation wire off which then mechanically wedged in the contact leaf.

I picked it out with tweezers, wrapped a little insulation tape around the damaged insulation, tested and reassembled.

All is now well and thanks for the suggestions.

Here's the offending (red) insulation :

Output jack

Pinetree
Moderator Emeritus
(with many stars)

NW Pennsylvania

Aug 20th, 2017 08:45 AM   Edit   Profile   Print Topic   Search Topic

Yay!



Te 52

Laws of Physics

strictly enforced
Aug 20th, 2017 08:55 AM   Edit   Profile   Print Topic   Search Topic

Nice piece of detective work, Inspector Charente.

Peegoo
Contributing Member
**********
**********
******

The rain sounds like

a round of applause
Aug 20th, 2017 09:26 AM   Edit   Profile   Print Topic   Search Topic

"You said 'minkey'."

Well done, mon ami!

Charente
Contributing Member
****

France

Aug 20th, 2017 09:49 AM   Edit   Profile   Print Topic   Search Topic

It's alright I have a leesens ;-)

Nah Te 52. Once I opened it up it was obvious that the little sliver of red plastic didn't belong there.

What I can't work out is why it made the pedal behave the way it did but I can live without knowing.

FDP Forum / Miscellaneous and Non-Fender Topics / What's the diagnosis?




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