Apple 705-0040 Apple Hairpin Spring Key Switch Lot Of 2 New Apple IIC

Description

SKU
:
C-d-(0121)
Apple 705-0040 Apple Hairpin Spring Key Switch Lot Of 2 New Apple IIC
Product Description
: New old stock. Never used. There would be some sign of solder if they had been used. Work smooth with fast response. Checked with ohmmeter to be sure of operation and read open to 0 ohms on both sides when depressing switch. I actually acquired 6 of these switches but for some reason (maybe to use in a repair?) 4 were missing the hairpin clip, part of reason I ohmed out the 2 with clips.
Acquired from elderly retired electrical engineer/instructor.
Please Only Purchase If You Know This Is The Switch You Need. See measurements in photos. I read doing some research that different style key switches were used on the same model keyboards.
Please let me know if you have any questions.
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Usually when keys are not working in a keyboard there can be two different general issues:
single key switches with problems within the switches themselves - or
problems with the PCB and damaged PCB-lines.....
It ́is rather easy to determine between this two kind of issues.
If a PCB-line is damaged - then ALL of the keys in that line will fail......
If only single key switches within of a line or different lines are out of order - then the damage is surely located within the key switch itself! Any attempt to repair a switch itself or to replace it, causes first the need to unsolder the key switch
from the PCB before you can extract it from the keyboard
If the problem is not dependent to the PCB but instead to the switches themselves, it sometimes helps just to hit that key quite a lot of times (some 200 hits or more) and probably spray very carefully some contact-spray to the key at the top where the key cap slider enters the key switch cabinet.
The reason this sometimes solves the problem is the fact that due to age the contacts within the switch might have become corroded with a small film of oxidative metal and the moving of the switch and the contact-spray makes the film get removed "by action" (i.e., you might say "rubbed off").
We are a U.S. seller. This product is in stock and ready to ship.
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Please view all of the photos as they are part of the description and intended to help you determine age and condition.
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Any items being used and vintage may have scuffs and/or scratches. Any defects and/or damage will be noted.
Almost all specs are from research, but without manuals I can not guarantee or verify these are correct numbers.
These items are used and due to the age in most cases vintage stuff. We try to describe as best we can. Most listing items I have collected came from estate sales and/or garage and yard sales over the years.
I do not know the history of any items. I do basic simple tests to see if an item works. If I find something is non-working or broken, I will list as such.
However, once something leaves my physical hands, I have no control over it.