[GreenKeys] What are these odd devices on 28RO

[Paul Heller]

Nick is right. That “wheel” is the vertical tab.

Paul
W2TTY

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> On Oct 2, 2019, at 9:51 AM, Nick England <navy.radio at gmail.com> wrote:
> 
> 
> The switch is for the interior lights. 
> Maintenance position means the lights are on even if the motor is off. 
> Normal position means the lights are on when the motor is on, 
> Off means off :-)
> 
> I think that is a vertical tab device on the left side.
> Maybe this one - 
> http://www.navy-radio.com/manuals/tty/50004s-6509.pdf
> 
> best regards,
> Nick England K4NYW
> www.navy-radio.com
> 
> 
>> On Wed, Oct 2, 2019 at 11:08 AM ad7i <ad7i at ad7i.net> wrote:
>> Greetings --
>> 
>> I have a model 28 RO that came out of an engineering or architectural firm near NYC about 20+ years ago.  I've run it a couple of times over the years, but have recently greased and lubricated it again and hope to run it a lot more.
>> 
>> There are a couple of items under the hood that I don't understand and I wonder if people here could give me some info about them.
>> 
>> First is a Maintenance switch that's under the lid on the right hand side, on an aluminum panel.  It looks like there's an AC transformer and other components behind this panel.  Does anyone know the purpose of this switch?  Or the function of the electrical components on the back side of the switch panel?
>> 
>> I don't know if attached photos are allowed, so instead here's a link to the photo on Dropbox:
>> 
>> https://www.dropbox.com/s/c1y32kg3clkdnyt/m28ro%20switch.jpg?dl=0
>> 
>> Second, there's some sort of a wheel arrangement on the paper roller, on the left side of the printing mechanism.  Is this some sort of a form-feed system, or something else?  There a small lever at the bottom of the photo (see smaller red arrow) that seems to disengage this device, and it has been disengaged by a small wire that holds the lever down.
>> 
>> https://www.dropbox.com/s/a5f38odydara7z6/m28ro%20wheel.jpg?dl=0
>> 
>> Thanks to all those who can provide some insight into what these things do.
>> 
>> 73, Paul, ad7i
>> 
>> 
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