[GreenKeys] Model15 keyboard wiring?

[steve bennett]

 John,

When all else fails read the manual right? lol
I think I have it figured out now.

Thanks,
-Steve AD8CI


     On Wednesday, February 26, 2025 at 03:01:36 PM EST, john <john at tubetestingpros.com> wrote:  
 
 Greetz!One of the books I sent is the operation / service manual for that machine.. IIRC the wiring diagram is in there someplace...
-------- Original message --------From: steve bennett via GreenKeys <greenkeys at mailman.qth.net> Date: 2/26/25 11:38 (GMT-08:00) To: greenkeys at mailman.qth.net, harold at w6iwi.org Subject: Re: [GreenKeys] Model15 keyboard wiring? 
 
Maybe I am measuring between the wrong contacts?
Why are there 3 contacts instead of 2?
There is a left, a center, and a right contact.
The center and right might be tied together therefore electrically the same.

-Steve     On Wednesday, February 26, 2025 at 02:18:07 PM EST, Harold Hallikainen via GreenKeys <greenkeys at mailman.qth.net> wrote:  
 
 The keyboard SHOULD be a short when idle. Perhaps one of the switch
contacts is bad. It also may appear to be an open circuit at low voltage
and current and do fine with high voltage and current (60 mA). The
keyboard should indeed be in series with the selector magnets.

Good luck!

Harold

On Wed, February 26, 2025 12:09 pm, steve bennett via GreenKeys wrote:
> GKs,
>
>  Greetings. John Lawson was kind enough to send me a keyboard for my model
> 15 and
> I am trying to figure out how to wire it.
> My machine is a RO and is not equipped with the electrical contacts for
> the keyboard.
>
> I thought it would just be wired in series with the printer but apparently
> I was wrong.
> The keyboard is an open circuit when in the idle state and when a key is
> pressed contacts in the
> mechanism close in sequence to produce the code.
> Exactly the opposite of what I was thinking it would do.
> If I wire the keyboard in parallel with the printer it will appear as a
> short circuit to the loop supply
> when contacts close so it would effectively shunt the selector magnets and
> short out the loop supply.
> (My loop is a Flesher TU170)
>
> That does not sound safe.
> Can someone explain how this is supposed to work? Do I need at add a
> current limiter to the keyboard or does
> it do it's own current limiting?
>
> And does polarity matter?
>
> Thanks,
> -Steve
>
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