About GK2A female jack 3.5 mm

Started by pasha811, May 03, 2022, 07:28:27 AM

Previous topic - Next topic

0 Members and 1 Guest are viewing this topic.

pasha811

I need to replace the little 3.5 mm Female Jack on my GK2A as it has worn out.
(you can check the saga in my other post about the subject  8) With the help of forum members I was able to clean it, restore it but now the glitch came back as I am not good to create a hook and go get the springy parts in place again)

Thanks to Admin I had some clue about the kind of PCB through hole mount casing I need but when checking the final findings (and after a good learn about switch Jacks I have found here : https://www.cuidevices.com/blog/understanding-audio-jack-switches-and-schematics) I discover that I am not sure that GK2A has a female switching jack. In the schematics I have tried to decode (newbie alert here) I can be 100% sure that GK3 has one while GK2A might not. However the soldering on the PCB is three holes which points to a 2 conductors 1 switch line as in this series : https://www.cuidevices.com/product/interconnect/connectors/audio-connectors/jacks/mj-3536ng

The pins do not correspond to the GK2A PCB but I can try to extend the paths, make new holes or other stuff as implementing a bridge made of cables, AWG 24 or 22.

So I need to know:

Does the GK2A hosts a Switching Female Jack ?
Can anybody provide a PCB schema (I mean not the drawing but what Pin correponds to) so I can match the pins of the new one?

Thanks a lot
Cheers
Paolo
Listen to my music at :  http://alonetone.com/pasha/

admin

#1


The  Guitar input Jack on GK-3 has a normally closed contact to reference the input signal to ground (mute) when unoccupied -for lowest noise on GK Processor.

The GK-2A lacks this switching  type jack.



The GK-2A Schematic is very popular, so much so that free image hosting sites Block access to that file

See the Attachments in the
GK  Schematics thread
https://www.vguitarforums.com/smf/index.php?topic=73.0#msg103

GK-2A


GK-3

pasha811

Thanks Admin!

If GK2A is not switching type why it is soldered with three soldering joints to the PCB? Is the third one an additional shield of some kind? Shouln't it be 2 conductors (signal and ground)?
In the meantime I have asked Roland Italy through their #1 Reseller if they have a spare part... not many chances but I found a GK2A wart body plate in 2016...

Cheers
Paolo

 
Listen to my music at :  http://alonetone.com/pasha/

philjynx

#3
Quote from: pasha811 on May 03, 2022, 09:40:56 AM
If GK2A is not switching type why it is soldered with three soldering joints to the PCB?





It's just mechanical attachment... Think glue.


Many PCB mounted components have extra solder points to physically attach them and also to help avoid pulling tracks off the PCB if they are subjected to external forces (like us tripping over the cable plugged into them).

pasha811

Quote from: philjynx on May 03, 2022, 09:47:53 AM

It's just mechanical attachment... Think glue.


Many PCB mounted components have extra solder points to physically attach them and also to help avoid pulling tracks off the PCB if they are subjected to external forces (like us tripping over the cable plugged into them).

So simple. So true. So if I attach a simple 2 conductor 1 switch line in the proper places the switch line remains useless and only an anchor point right? I need to do a close up with the PCB to find out what is the useless (not connected) pin.

Thanks!
Cheers
Paolo
Listen to my music at :  http://alonetone.com/pasha/

admin

#5
Quote from: pasha811 on May 03, 2022, 09:40:56 AM
Thanks Admin!

If GK2A is not switching type why it is soldered with three soldering joints to the PCB? Is the third one an additional shield of some kind? Shouln't it be 2 conductors (signal and ground)?
In the meantime I have asked Roland Italy through their #1 Reseller if they have a spare part... not many chances but I found a GK2A wart body plate in 2016...

Cheers
Paolo



GK2A 3.5mm Guitar Input Jack has 3 soldered legs because thats the same type jack Roland uses on several products and buys a common part by the thousands.

pasha811

Quote from: admin on May 03, 2022, 11:44:17 AM
GK2A 3.5mm Guitar Onput Jack has 3 soldered legs because thats the same type jack Roland uses on several products and buys a common part by the thousands.

Thanks Admin! So let's hope they still have one spare for me as all the ones I have found have different legs positions compared to the original  ;D
Listen to my music at :  http://alonetone.com/pasha/

pasha811

Roland has 1 spare but only the board with components. The GK2A connector needs to be moved from old to new board. 50 Euros.  That's good news but...

Today I tried with a pin made as a hook to restore the springiness of the female Jack retention mechanism and I have found out that the casing third leg was not firm into the hole in the PCB so I resolder it.

Unbelieveable... now it seems to work. I played several chords and then rock the guitar and instead of the usual stutter I got continuos sound.

That's good news but I think I will order the PCB anyway  just in case, what do you think?

Listen to my music at :  http://alonetone.com/pasha/

gumtown

#8
Unless the GK-2A is of special need to you, I would go buy a new GK-3 and be done with it.
If you were to to put hourly rate on your time for trying to repair something, the cost adds up quickly if you are inevitably fighting a losing battle.  ;)

That is my 2 cents worth of 'words of wisdom'
as time goes by, time becomes more valuable.
or maybe I'm now less tolerant to broken things.  :)
Free "GR-55 FloorBoard" editor software from https://sourceforge.net/projects/grfloorboard/

admin

Quote from: pasha811 on May 04, 2022, 06:39:53 AM
Roland has 1 spare but only the board with components. The GK2A connector needs to be moved from old to new board. 50 Euros.  That's good news but...

Today I tried with a pin made as a hook to restore the springiness of the female Jack retention mechanism and I have found out that the casing third leg was not firm into the hole in the PCB so I resolder it.

Unbelieveable... now it seems to work. I played several chords and then rock the guitar and instead of the usual stutter I got continuos sound.

That's good news but I think I will order the PCB anyway  just in case, what do you think?

If I had a new GK-2A PCB for $50, I would just unplug all the cables from the old GK-2A PCB , and swap PCB

pasha811

Quote from: gumtown on May 04, 2022, 12:57:33 PM
Unless the GK-2A is of special need to you, I would go buy a new GK-3 and be done with it.
If you were to to put hourly rate on your time for trying to repair something, the cost adds up quickly if you are inevitably fighting a losing battle.  ;)

That is my 2 cents worth of 'words of wisdom'
as time goes by, time becomes more valuable.
or maybe I'm now less tolerant to broken things.  :)

GK2A is very important to me as it sits in my 1989 Strat Plus.
Recently I cannot afford anymore playing with an high action.
GK2A has a lower profile so it fits nicely under the strings. I only had to use two screws on the pick guard. My action is now between 1.75 to 2 mm and it can be taken down to 1.75 mm. Gk3 profile is 1 mm more and that brings the action up. I tried. It is not even able to pass under the strings (whatever radius I tried) while GK2A is perfect and allowed me to come down from 2.25 mm. ( I removed the Roland .25 double tape and used screws) .

Hope that make sense to you, I do not want to cut the pick guard to install GK3 and have the same action. I have done it on another Guitar and it was not a walk in the park.

Ciao
Paolo
Listen to my music at :  http://alonetone.com/pasha/

pasha811

Quote from: admin on May 04, 2022, 01:04:34 PM
If I had a new GK-2A PCB for $50, I would just unplug all the cables from the old GK-2A PCB , and swap PCB

In an heartbeat!
Just ordered a plastic set of pry and open tools from I fix it that will help me with both my computer and the pickup socket on the PCB. I still have not a delivery date of the PcB but that is ordered.

Thanks Admin!

Cheers
Paolo
Listen to my music at :  http://alonetone.com/pasha/