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Old 04-24-2016, 09:00 PM   #1
onemanvan
 
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Default Central electronics control/display panel push button repair

It has gotten to the point where I have to press VERY HARD for the buttons to make contact.
After a few hours of researching possible solutions I finally chose this one.

1) Clean black contact pads with isopropyl alcohol to help promote good adhesion.

2) Cut up a small square of adhesive backed aluminum foil tape.

3) Position tape on top of black contact pad using a pair of tweezers.

3) Press HARD with thumb for 20 seconds to help promote good adhesion.

It now takes very little pressure to activate the buttons.
Only time will tell if the little aluminum squares stay adhered.

John...
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Old 04-25-2016, 12:58 AM   #2
OldWest
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Default Re: Central electronics control/display panel push button repair

Sounds like a great solution.

1. What's the trick to remove computer console--some release in the side slots?

2. How to remove the symbol pad to get access for tape--pry out or ???

Thanks.
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Old 04-25-2016, 03:13 AM   #3
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Default Re: Central electronics control/display panel push button repair

I KNEW somebody was going to ask me those questions:-)

1. What's the trick to remove computer console--some release in the side slots?

Remove the DOME light - on either side of the control module there are tabs - press those in and the module pops out. Getting it back in - at least in my case - is a bit trickier... When you push the module back into it's hole the tabs don't automatically lock it into place. You have to insert a long thin screw driver or drill bit into the little holes on either side of the module face plate and gently pry the tabs outward until they snag the edges of the cutout in the headliner.

2. How to remove the symbol pad to get access for tape--pry out or ???

First remove the plug from the back of the module. To do that pull out on the black plastic retainer. It doesn't come all the way out - just most of the way. Then gently but firmly work the plug loose from the module.

Take the module inside your shop and put it on the work bench. Lay it face down and notice there are little tabs poking out from the inside rim of black face plate. Those tabs lock onto the body of the white plastic module. There are two tabs at each end and three along each side. Starting at one corner of the module. Take a flat blade screw driver and gently pry the frame of the face plate outward till the tab is clear of the rim on the white plastic module. Once the tab is clear of the rim press the face plate frame downward. Alternate between the two tabs on the corner. If you're not having any success with that corner try another one. Once you get one corner of the face plate unlocked from the frame the other tabs are easier. It's hard to describe exactly what hand motions and the correct sequence to use... Just be very careful, patient and persistent. Eventually you'll figure it out. Either that or you break it all to hell and cuss me out for ever suggesting this fix in the first place:-)

Once the face plate has been separated from the module body you'll see the rubbery button assembly. It just lifts out of the face plate.

Last edited by onemanvan; 04-25-2016 at 03:47 AM.
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Old 05-14-2016, 04:30 AM   #4
CaptnALinTiverton
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Default Re: Central electronics control/display panel push button repair

I thought I read somewhere on the internet that using isopropyl alcohol is not good for carbon contacts. Where is the other forum or string on this forum about buying new carbon contacts on Amazon?

AL
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Old 07-04-2019, 04:24 AM   #5
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Default Re: Central electronics control/display panel push button repair

Quote:
Originally Posted by onemanvan View Post
It has gotten to the point where I have to press VERY HARD for the buttons to make contact.
...
Only time will tell if the little aluminum squares stay adhered.
So, John - how has time treated this fix? I need to do this for my control panel next weekend :)

Cheers,
Brian.
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Old 07-04-2019, 03:31 PM   #6
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Default Re: Central electronics control/display panel push button repair

The aluminum squares have not fallen off. As time goes by some buttons are beginning to require a firmer press but it's still acceptable.
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Old 07-04-2019, 03:41 PM   #7
MrTomacco
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Default Re: Central electronics control/display panel push button repair

There are several types of isopropyl out there. Did you use the anhydrous (without water) alcohol?
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Old 07-04-2019, 05:08 PM   #8
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Default Re: Central electronics control/display panel push button repair

General Chemicals sells sold a "contact pad renew" kit ... it's a carbon-bearing cyanoacrylic "paint".
(now "Chemtronics" as "CircuitWorks")

I've used it on many such keypad gadgets that are exposed to ridiculous weather situations.

Two examples:
https://www.mgchemicals.com/products...epair-kit-8339
Digikey carries it, too: https://www.digikey.com/products/en?keywords=CW2605-ND
(the Digikey version is the one i've used many times ... and heavily-used keys treated 15 years ago are still working)

--dick
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Last edited by autostaretx; 07-04-2019 at 05:11 PM.
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