Plus 4 power switch

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Gyro Gearloose
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Plus 4 power switch

Post by Gyro Gearloose » Fri Jan 25, 2019 1:43 pm

Got a Plus 4 that wouldn't power up. Power supply was good, fuse was good. Seller assured me it worked before it was put in storage.
Probing the power connector revealed no difference in resistance between 5V and ground with the switch either on or off.
Measuring the resistance at the switch itself revealed that there was no contact made in the ON position.
Wiggling the switch's rocker would occasionally cause contact.
So I took the switch apart, indeed the contacts were oxidized or something like that.
Attached is a picture of the two contacts in there, one is cleaned with a pencil eraser, the other isn't.
See the difference? :D

Putting the switch back together is another story....
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20190125_033252.jpg


The price one pays for pursuing any profession, or calling, is an intimate knowledge of its ugly side.

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Gyro Gearloose
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Re: Plus 4 power switch

Post by Gyro Gearloose » Fri Jan 25, 2019 3:31 pm

Meh, it was quicker than expected, since it turned out I still had a little tube of special contact grease just for switches.
The Plus 4 powers up. I haven't checked anything else yet.
The price one pays for pursuing any profession, or calling, is an intimate knowledge of its ugly side.

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Zippy Zapp
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Re: Plus 4 power switch

Post by Zippy Zapp » Fri Jan 25, 2019 8:20 pm

Cool. The switch went together good then? Those switches are hard to find, these days, so disassembly and cleaning is a great option.
Nice Work!
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Gyro Gearloose
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Re: Plus 4 power switch

Post by Gyro Gearloose » Sat Jan 26, 2019 1:02 am

I've gotten good at switch surgery because I also do the same on my 1960s Tektronix lab stuff. There are some very nice switches in there that are just beautiful pieces of engineering. But either impossible to find or you get the right one but with the wrong color lens for the illuminated ones.
The price one pays for pursuing any profession, or calling, is an intimate knowledge of its ugly side.

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