Twin Famicom B button not working?

Started by TurtleKirby1234, May 13, 2024, 12:15:50 am

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TurtleKirby1234

As you might've known from my previous posts (probably not), I recently got a Twin Famicom ;D But then I found out the B button doesn't work, which is probably the first time I've ever appreciated the fact that none of the Famicom launch titles use it. Fortunately, when I used the ancient trick of "using straw to blow into the button :pacman: ", it actually ended up working!! But then it stopped working again. It ended up being pretty unreliable afterwards anyway, so I decided to unscrew the controller to see the problem, but the screws were too tight. So, every time I needed to use the B button, I had to blow into it while pressing it, and pray it works. While it usually does, I'm concerned about its long-term health. Is there a more effective and permanent way to fix it without replacements? :help:
How do I write a signature again?

Skawo

Clean the pad and the conductive part of the rubber dome with 99% isopropyl alcohol

TurtleKirby1234

Quote from: Skawo on May 13, 2024, 12:23:43 amClean the pad and the conductive part of the rubber dome with 99% isopropyl alcohol
I guess everything works with isopropyl alcohol. Thanks for the help.
How do I write a signature again?

TurtleKirby1234

Edit: It didn't work, and actually ended up breaking it even more, affecting the A button.

How exactly do you do it again? If it doesn't work, then maybe I should just get a third-party controller and plug that in...
How do I write a signature again?

P

Affecting the A-button sounds like something else went wrong when you opened it, maybe something that was about to fail was hurried when you did things with it.

Could be the membrane, conductive pads, the cable or even broken traces on the PCB.

Replacement membrane can be bought easily, Famicom joypads uses the same parts as NES joypads.
For cleaning the conductive pads you can use a toothbrush and scrub them with isopropyl alcohol then let it dry.
To check the cable you need a multimeter and do a continuity test on each wire to see that none is broken.
The same goes for the PCB, use the probes on relevant terminals if you see a suspicious trace. The whole PCB can also be cleaned with isoprobyl alcohol, perhaps some old flux residue has become conductive and needs to be cleaned off or something.

MWK

I'm always using yer good 'ol pencil rubber eraser - never let me down so far  8)

TurtleKirby1234

Quote from: MWK on May 15, 2024, 10:29:45 amI'm always using yer good 'ol pencil rubber eraser - never let me down so far  8)
I love how all these ancient techs using everyday items actually work.
How do I write a signature again?