[GreenKeys] M15 How to disable unshift-on-space?
Richard Knoppow
1oldlens1 at ix.netcom.com
Sat Sep 19 01:42:17 EDT 2015
I wish I had been paying more attention; I saw Fusetrons for sale
somewhere unexpected just recently. I think it was Home Depot. There
are still some homes with fuse boxes that use these. I think the
ordinances in Los Angeles require homes to have circuit breakers and not
fuses. Its certainly so for rental units but I am not sure about
private homes. In any case Fusetrons seem to still be around.
I have seen other old electronic equipment with conventional Edison
screw base fuses. Most later equipment uses cartridge style fuses in
clip fuse holders. I think even Radio Shack has fuse clips. The fuse
holders for screw base fuses are nothing more than ceramic lamp
holders. Fusetrons also go in these but with an adaptor to accept the
special thread that keeps you from putting in the wrong sized fuse. The
adaptors can't be removed without destroying them.
If Teletype did not install fuses its possible UPI did in order to
protect the machine and perhaps also to avoid running afoul of ordinances.
On 9/18/2015 10:20 PM, Ed Sharpe Archivist for SMECC via GreenKeys wrote:
> adding this to public archive as here is my value for the upi
> unit which I took home to clean lube and adj.
> my other units have anything from nothing to a regular looking
> fuse and holder that looks like one used inside a radio.
> as to the value I am not there right now.but the UPI recent 15
> ((HA You can buy 4 for 70 bucks?!?!?!?
> here is a new listing for my fusetron fuse by another mfr... someone
> may want to educate us on valuses needed
> <http://www.zoro.com/i/G3449686/>
>
> *
>
>
> Fuse, 3-2/10A, T, 125VAC, Screw-In, PK4
> <http://www.zoro.com/i/G3449686/>
>
> * $70.25
> * BUSSMANN
> * G3449686T-3-2/10
>
> In a message dated 9/18/2015 9:41:24 P.M. US Mountain Standard Time,
> drlegendre at gmail.com writes:
>
> Ed,
>
> Have had the fuses replaced with +what+ ?? ;-)
>
> On Fri, Sep 18, 2015 at 11:14 PM, <COURYHOUSE at aol.com
> <mailto:COURYHOUSE at aol.com>> wrote:
>
> our latest UPI ro 15 has the screw in fuse! all other
> 15s we have had the fuses replaced.
> Ed# www.smecc.org <http://www.smecc.org/>
> In a message dated 9/18/2015 8:59:38 P.M. US Mountain Standard
> Time, drlegendre at gmail.com <mailto:drlegendre at gmail.com> writes:
>
> Wow, so the household fuse is correct - that's just nuts!
> Maybe I'll pull it and bypass with a 1A slow-blow and
> maybe a CIL to deal with inrush currents. The present
> arrangement just isn't what I'd call proper 'protection'..
>
> In other news, I think I've corrected the aberrant
> behavior. And yes, it does seem like it's all down to that
> very fine clearance between the cutout lever and the
> vertical extension of the SP function lever. I added a few
> turns of solid metal foil tape to the little dog-leg on
> the end of the cutout lever, to reduce the clearance to
> nearly nil.. maybe 0.002 or so.
>
> And the USOS is gone, at least for now. Obviously I have a
> lot more to learn about this mechanism, but for now, I'm
> stunned that such a tiny little gap could allow the
> unwanted behavior. My hunch is that something else,
> somewhere, is either improperly adjusted, improperly
> installed, or just plain worn. Very surprising, but again,
> I have much to learn.
>
> I will post a pic of the connector box in a few minutes.
> But for now, the machine is behaving as I'd like... =)
>
> On Fri, Sep 18, 2015 at 10:09 PM, Jim Haynes
> <jhhaynes at earthlink.net <mailto:jhhaynes at earthlink.net>>
> wrote:
>
> All the ones I've seen use the screw-type household
> fuse, except it's
> an odd value like 6 1/4 amp slow-blow. Remember that
> the motor draws
> much more starting current than running current. Also
> some installations
> include a 120VDC power supply, and there is often a
> convenience outlet
> on the side of the base where the repair guy can plug
> in a soldering
> iron or a light fixture. Not that I'd want to be
> soldering on the wiring
> while it is plugged into the power line.
>
> The bare machine doesn't care about polarity. Those
> which include a
> polar relay on the base do. And there are some
> variables like a motor
> control relay that is controlled by polarity.
>
> Can you send a picture of the Bell System box you are
> talking about?
>
>
>
>
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--
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL
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