[GreenKeys] Model 14 restoration

[Richard Knoppow]

    I wonder if this warning was anything like the and of film 
warning attached to some theater projectors. It had a bell with 
an arm that rested on the side of the reel. As long as it fell on 
film the bell didn't ring but when the film ran out the arm would 
poke through the holes in the reel and work the bell. You could 
sometimes hear them in the audience if the film was not loud. It 
was a signal to wake the operator up to watch for the change over 
cues.

On 3/17/2021 9:46 AM, John Nagle wrote:
>> From: Nick<creativegardening at hotmail.com> 
>> To:"GreenKeys at mailman.qth.net" <GreenKeys at mailman.qth.net> 
>> Subject:
>> [GreenKeys] Model 14 restoration
>>
>> There is a working bell located on the left side of the 
>> printer and
>> another one located on the right side in the far back on the
>> keyboard. That particular one doesn't have a hammer, guess the 
>> entire
>> bell assembly is missing. On the backside of that bell is a 
>> small,
>> flat and square (?x?") THING - looks like a capacitor and both 
>> wires
>> are connected/grounded to the base of the keyboard via one tiny
>> screw.
>>
>> 1. why is there a second bell ? 2. how was this bell activated 
>> ? 3.
>> is that little square box really a capacitor and why is it 
>> there ?
>
> The bell at the back of the keyboard assembly is the 
> out-of-tape bell.
> It rings continuously if the supply of blank tape gets low.
> I have two Model 14 tape printers with those.
>
> See Figure 2, page 17 of.
>
> http://aetherltd.com/public/model14manuals/126_Model14_Descr_Dec31.pdf 
>
>
> and, for the reperforator, Figures 6 and 7, page 23, of
>
> http://aetherltd.com/public/model14manuals/172B.pdf
>
> Electrical arrangements vary. Some Model 14 and 15 machines have
> RF noise suppression capacitors. The keyboard contacts will arc 
> when
> in series with the selector magnet and its huge (5H) inductance.
> But the Model 14 predates radio, so in the early models there's
> no noise suppression. A sealed grey box with two terminals is
> probably a capacitor. Use an ohmmeter and see if it's
> shorted.
>
>             John Nagle
>
>
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL