[GreenKeys] Model 19 progress and a few questions...

Mon Aug 7 11:10:50 EDT 2017

I will toss in another one, what drawing(s) you have may not apply to the
19 you have. Even if they came attached to the unit. If your 19 ever got in
the hands of a Ham Radio operator, 99% chance what is in a
Teletype/UW/Bell/etc drawing will not even come close.

But before that, get the RTTY handbook (scanned ?) If not try
http://www.samhallas.co.uk/repository/telegraph/introduction_to_RTTY.pdf

Get the Adjustments, Parts, and Theory. Take some time to go through them.

Have a cheap current 100 mA current meter ? You can replace the above with
it.

Live near Harbor Freight ? Get one for free about ever 4 months.

What is your power source ? put the current meter in series if it does not
say 60 mA
with its output shorted. unshort the output, and put a volt meter across
the output.
Does it say 80-120 VDC ? If either of the above are not yes, put the 19
away and
fix your supply. Then

Put the power supply across the magnets ? does the printer shut up ? yes
put the supply across the terminals you think are the right ones. Does the
printer
shut up ? yes. disconnect the supply does the printer go nuts ? yes. Your
done.

Keyboard, connect to terminals you think are the right ones. Does the meter
show 60 mA, no wrong terminals or some connection missing, broken etc.

Fix

Show 60 mA .. Power to the 19 motor off, hold down a key, hand rotate
the motor, watch the keyboard look for a contact opening, does the meter
show 0 mA ? your done.

No .. etc etc etc

On Mon, Aug 7, 2017 at 7:38 AM, Ralph Mowery <rmowery28146 at earthlink.net>
wrote:

>
>
> > -----Original Message-----
> > From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-
> > bounces at mailman.qth.net] On Behalf Of E.
> > Sent: Monday, August 07, 2017 1:45 AM
> > To: WA5CAB--- via GreenKeys
> > Subject: Re: [GreenKeys] Model 19 progress and a few questions...
> >
> >
> > Hi all!
> >
> > Sorry for that last schematic… I was trying to decipher one of the
> > previous emails with it, so the circle I had on there was incorrect ;o
> > (sorry again).  Since this is still a bit new to me (slowly figuring it
> > out), a few more questions:…
> >
> > *Does "running open" means being all noisy - clicking away and not
> > doing anything except the motor running (as opposed to an open circuit,
> > like what was being talked about with the line jack)?
> >
> > *If the above does mean running open, that is my case - it’s not doing
> > anything with the keyboard.  I have current running though the main
> > unit & keyboard (minus the perforator side - for the time being) but
> > nothing going on the typing unit (just clicking away noisily).  I got
> > lost about the jumping… either with jumping the line jack or the
> > terminals on the side (sorry - multiple emails with multiple subjects
> > ;p ).  What jumping do I need to do and where, so that it may not run
> > open (I’m hoping terminals on the side - the line jack checks out fine
> > with the ohm meter)?
> >
> > *Will the signal lamp glow when on keyboard?  If it does, looks like I
> > have more sniffing out to do...
> >
> > Today was mainly a day of taking off the typing unit, checking
> > lines/resistors, oiling and trying to figure out the mechanical side of
> > it.  May do a video tomorrow… the printing bail blade doesn’t seem to
> > be working like it should, but one thing at a time ;o .  After over a
> > week of working ’n trying to fix, I’m a bit burnt out tonight, so will
> > take a break for the rest of the evening ;p ~…..
> >
> >
>
> Running open means that the current loop going to the selector magnets on
> the printer is open.  When this happens, the printer will be doing all
> kinds of mechanical operations and making lots of noise.  When the machine
> is running closed, then just the motor and the shaft it is connected to is
> moving and the machine is relative quiet.
>
> The light on the model  19 near the keyboard is set to light up after
> about 60 some characters have been punched out on the tape punch.  It is to
> let you know when to put a line feed and mainly a carriage return on the
> tape as you can not see the amount of characters on the tape.  When you
> type in a CR the counter will go back to zero and the light will go out.
>
>
> The wiring in a printer is somewhat difficult.  However all you really
> need to know is that the magnets on the printer you have seem to be the
> holding type as it has a switch for series and parallel.  The two coils are
> in parallel with each other when you use a 60 ma loop current.  They do
> have to be phased correctly.  If not they will not have much pull.  You
> will have to reverse the wires going to one coil if this is the case.   The
> keyboard has a wire gong to the contacts that are all in series with each
> other. And make and break as the shaft rotates around.   You should be able
> to pull the two phone type plugs out, hook them in series with a 60 ma loop
> supply (magnets in parallel with each other) and get the printer to print
> from the keyboard.  The polarity of the current does not make any
> difference.
>
> I am not sure what you are using for a loop supply.  The normal type would
> be about 150 to 200 volts DC with around 2000 ohms of resistance adjusted
> for the 60 ma loop current.  You can use lower voltage, but  stay above 50
> volts to get good results.
>
> Good luck.
>
>
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