[GreenKeys] Model 15 troubleshooting

[Larry Tighe]

What's the numbers on the motor pinion and shaft gear?

lar
----- Original Message ----- 
From: "John Nagle" <nagle at animats.com>
To: <greenkeys at mailman.qth.net>
Sent: Friday, January 30, 2009 14:45
Subject: [GreenKeys] Model 15 troubleshooting


>    OK, I have my model 15 oiled, powered, and connected with
> keyboard and printer in series.  It runs, but won't type correctly.
> Not even close.
> 
>    First, this is a "clean" model 15; there's no sign of damage
> or nonstandard modifications.  It was just in storage for a long
> time, and the lubricants had gunked up.  I've cleaned it by
> immersion in Simple Green, and oiled it per the manual, using
> 5W-20 Valvoline synthetic, with lithium grease on the gears and
> big sliding parts.  Small oiling points were oiled with a one-drop
> precision oiler.  Everything runs, and reasonably quietly.
> 
>    Loop power is 120VDC regulated, through a resistor just under 2K.
> The selector magnet has a 55 ohm resistance, and loop current was
> measured at 60.4 mA.  The selector magnet ("pulling" type)
> seems to be pulling in correctly.
> 
>    But the selector magnet seems to be "slow", like it can't keep
> up with the incoming bit stream.  RYRYRY doesn't bring up alternating
> code bars.  It's as if the selector magnet can only keep up with
> about half the bit rate.  (The machine seems to be running at standard
> speed; it's not like somebody put in 100WPM gears or something.)
> 
>    The selector magnet faces are clean of oil, the selector magnet
> moves freely, and all the obvious stuff seems OK.  The swords
> and everything downstream from there seems fine.   I've de-gunked
> and carefully oiled everything in that area, and it doesn't help.
> Adjusting the range finder has little effect.
> 
>    Am I missing anything obvious?
> 
> John Nagle
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