Fixed Broken GK2A!

Started by pasha811, December 24, 2023, 08:18:06 AM

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pasha811

Well, Last year I had some problems with the Normal Guitar input of my GK2A. After many tries and following suggestions from forum members I found that one of the solder joint was gone. I re-solder it and all was ok. In the meantime weeks before I ordered from my local Roland shop a pre-amp board replacement for GK2A. 50 Euros.
It remained there for almost a year until today when the GK2A Normal Guitar input damage was not repairable (to me). So I proceeded to exchange the amp board old for new.

The female jack case broke and provided no contact.
The Internal contacts are now exposed.
https://drive.google.com/file/d/1CyqpV-G5uBmMzxq1vECUHFHPkRuVAwPM/view?usp=drive_link

Do you have circuit view of JK1 it has three solder joints and I'd like to solder a female jack but with wires as I cannot find an identical one.

https://drive.google.com/file/d/1COWb6cZBvgyyhO6mqJ7YM66OW7pjLXdq/view?usp=sharing

Thanks!
Merry Christmas
Pasha

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


pasha811

Quote from: Elantric on December 24, 2023, 01:22:17 PM


http://mitsubamushi.yana.jp/gk/gk2a.html



https://www.rapidonline.com/lumberg-1503-08-jack-socket-3-5mm-angled-pcb-mount-3-pole-stereo-straight-leg-54-4735


https://www.tme.com/us/en-us/details/1503-08/jack-connectors/lumberg/1503-08/

https://www.tme.com/Document/c4c9470305b4035b32f28ac6aae15c65/1503-08.pdf

Thanks Steve! 8)
The Lumberg Connectors has 4 legs while mine has three. I understand that this is a stereo with double switch while mine was (RIP) mono. That should allow the installation with 4 legs because one of the holes in the PCB is free (and always has been). So even without knowing the circuitry I can solder the 4 legs connector and it will work, right? On the Japanese Page the GK2A shown has 4 solder joints under the normal guitar 3.5mm input female jack socket. Is that because there are different versions of GK2A around right? Mine is the three solder joints one.

Have a nice Christmas!
Listen to my music at :  http://alonetone.com/pasha/

Elantric

#3
Cut one of the front legs, they are both ground

Roland has employed different PCB Design revisions for GK-2A, some have Guitar Input 3.5mm TS jack with  4 pins,  others have 3 pins - its only mono Tip / Sleeve connection required.