[GreenKeys] Model 14 restoration

[John Nagle]

> 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