5005 Lead 12 Combo Headphone/Line Out Jack Issue

Nobail

New Member
Joined
Nov 22, 2021
Messages
5
Reaction score
3
Location
Massachusetts, USA
Hi Folks,

<TLDR> How do those combo HP/Line out jacks work?</TLDR>

I have a 5005 Lead 12 Combo amp (with the combo line/out and headphone jack) that I have not had very long, but until yesterday was working great. However, yesterday, I plugged my guitar into the H.P/Line Out jack by mistake and then back into the guitar input jack, and now the amp won't work unless I have something plugged into the line out jack. I temporarily have this "fixed" by just keeping a 3.5 to 1/4 adapter plugged into the output jack, but this bugs me. I like things to work as they are supposed to work. So, how can I fix this?

So, of course, this jack is the finicky all-in-one combo jack where 1/2 way in, it outputs to headphones only and cuts the output to the speaker and full way in does line out and speaker output. There is probably a proper name for this type of jack, but I don't know it. Anyway, this jack seems to be working as expected in that if I plug in headphones half way, only the headphones work and if I plug the headphones all the way in, both the headphones and speaker work. However, when I remove the headphones (nothing in the jack), the speaker does not work. So... ummm... rats!!

Now, this jack is soldered to the board and I am not really in the mood to replace it if I don't have to, especially when my adapter trick works. I will if I have to do, but if I can fix the problem by adjusting or bending the leads in the jack which contact the plug, I would definitely try that first. Unfortunately, I don't seem to be able to figure out the magic combo of adjustments to make. As far as I can tell, there are three leads in the jack which make circuits and I will number them in the order in which they would contact the plug when it enters the jack. My assumptions are that if 1 and 2 make a circuit, then headphones only work and if 2 and 3 make a circuit, then line out and speakers work. I assume if no circuit is made, then only speaker works, but not sure about that.

Can someone explain or show me a link which explains how these types of jacks work and how the circuits work when 1) no input, 2) half input (headphones) and 3) full input (speakers and line out) work? The magic seems to be with lead 3. When I have sure this is completing a circuit (without a plug in), the speaker works. However, I am not really sure how these plugs work, so if someone can help educate me, I would be grateful. If someone knows name of this jack (combo jack? Two-way jack? ) and/or can point me to a replacement, that would also be helpful. I have replaced jacks on boards before, but not my favorite thing to do. But, in this case, I clearly don't know jack. :)

Thanks
-Hal
 

fitz288

Well-Known Yinzer
Gold Supporting Member
Joined
Apr 7, 2020
Messages
5,757
Reaction score
15,447
Location
the Burgh
Hi Folks,

<TLDR> How do those combo HP/Line out jacks work?</TLDR>

I have a 5005 Lead 12 Combo amp (with the combo line/out and headphone jack) that I have not had very long, but until yesterday was working great. However, yesterday, I plugged my guitar into the H.P/Line Out jack by mistake and then back into the guitar input jack, and now the amp won't work unless I have something plugged into the line out jack. I temporarily have this "fixed" by just keeping a 3.5 to 1/4 adapter plugged into the output jack, but this bugs me. I like things to work as they are supposed to work. So, how can I fix this?

So, of course, this jack is the finicky all-in-one combo jack where 1/2 way in, it outputs to headphones only and cuts the output to the speaker and full way in does line out and speaker output. There is probably a proper name for this type of jack, but I don't know it. Anyway, this jack seems to be working as expected in that if I plug in headphones half way, only the headphones work and if I plug the headphones all the way in, both the headphones and speaker work. However, when I remove the headphones (nothing in the jack), the speaker does not work. So... ummm... rats!!

Now, this jack is soldered to the board and I am not really in the mood to replace it if I don't have to, especially when my adapter trick works. I will if I have to do, but if I can fix the problem by adjusting or bending the leads in the jack which contact the plug, I would definitely try that first. Unfortunately, I don't seem to be able to figure out the magic combo of adjustments to make. As far as I can tell, there are three leads in the jack which make circuits and I will number them in the order in which they would contact the plug when it enters the jack. My assumptions are that if 1 and 2 make a circuit, then headphones only work and if 2 and 3 make a circuit, then line out and speakers work. I assume if no circuit is made, then only speaker works, but not sure about that.

Can someone explain or show me a link which explains how these types of jacks work and how the circuits work when 1) no input, 2) half input (headphones) and 3) full input (speakers and line out) work? The magic seems to be with lead 3. When I have sure this is completing a circuit (without a plug in), the speaker works. However, I am not really sure how these plugs work, so if someone can help educate me, I would be grateful. If someone knows name of this jack (combo jack? Two-way jack? ) and/or can point me to a replacement, that would also be helpful. I have replaced jacks on boards before, but not my favorite thing to do. But, in this case, I clearly don't know jack. :)

Thanks
-Hal
:welcome: to the forum.
Try a little contact cleaner first.
Deoxit is a staple fix-all to try before you get out the soldering iron and start tearing the amp apart.
Might just be some old dirty or stuck contacts.
Spray some on a cable end or the adapter and work it in and out of the jack a dozen times and see if that does the trick.
 

Nobail

New Member
Joined
Nov 22, 2021
Messages
5
Reaction score
3
Location
Massachusetts, USA
Hi fitz288. Thanks for the kind welcome. I forgot the obligatory "first post" comment. :) I also forgot to say that I tried that, which would have been a very helpful thing to add. oops. In any event, I sprayed deoxit in the jack and when that failed, I opened up the amp and sprayed more deoxit on the jack leads and even used a pipe cleaner to see if anything was cleaned out. The pipe cleaner did some have some black on it, but unfortunately, the issue remains. The amp only works (or perhaps it is more accurate to say the speaker only works) if something is plugged in the hp/line-out jack.
 

fitz288

Well-Known Yinzer
Gold Supporting Member
Joined
Apr 7, 2020
Messages
5,757
Reaction score
15,447
Location
the Burgh
BTW, is this just a regular stereo jack or something else?
Sorry man, closest thing I got is the Lead15MS, but it's got separate headphone & line out jacks.
I'm not sure if there's a schematic out there that would specify a part, or what the right part is that does that functionality.
But someone smarter than me (not a high bar) may come along and shed some light on this.
It might just be a standard TRS jack that's wired for the half way in thing - IDK :shrug:
Hang in there.
 

Tatzmann

Well-Known Member
Joined
Nov 8, 2021
Messages
1,012
Reaction score
1,428
This is a cliff stereo switching jack.
You have tried to clean it, but not
the parts that need cleaning, which
are the metal tabs which connect
or disconnect by plugging in a plug.

Fast way:
Little strip of paper soaked in contactcleaner
can be inserted between the metaltabs
and moved back and forth.

Long way involves building a tool for this
task. Try the paperstrip method.

The jacks sometimes are almost
impossible to clean, either because
you cant get to it without desoldering,
or they just start to act up again.
Dont bend the tabs, it will make things
worse. Sometimes they have to be replaced.
 

Nobail

New Member
Joined
Nov 22, 2021
Messages
5
Reaction score
3
Location
Massachusetts, USA
Thanks for the advice. I’m done working on the amp tonight, but will try tomorrow. I’ll start looking for a replacement jack in any case.
 

Nobail

New Member
Joined
Nov 22, 2021
Messages
5
Reaction score
3
Location
Massachusetts, USA
Looks like I don’t have good enough sandpaper, so I’ll need a trip to the store. In the meantime, I’m a bit confused on how to get a replacement jack. Here is a pic. So, it is a switched stereo jack. But, it looks different than ones I have seen, especially the third lead. 75D60E24-7356-4DBD-972E-5D268188293C.jpeg Anyone have a link to a replacement?

Also, I’m curious how they work. What circuits should be connected when nothing is plugged in? Is the top one always on? How does a switched jack work?
 


Top