[GreenKeys] ASR 33

Tue Nov 26 15:44:20 EST 2013

While on the subject of ASR33 R&R, I've got a very clean tabletop model 33
(should there be a stand?0, practically brand new and with very little use,
but I noticed the sound deadening/oil absorbing pad in the bottom
deteriorates upon contact with my finger. Any advice on replacement
material or sources for this? Everything else on the unit is clean as a
pin. Either way I've got to get the old one out of there lest it crumble
and gum up the works.

Thanks,
Cory

On Tue, Nov 26, 2013 at 2:35 PM, Teletypeparts <teletypeparts at aol.com>wrote:

> Doug,
>
> Clean the cover with 409 or Fantastik spray.  Wipe with a damp cloth
> after.  Some black marks can be removed with solvent sprayed on a rag and
> then carefully wipe the black mark.  Use the 409 first.
>
> Dont spray any solvents into the clear plastic contact holders in the tape
> reader or keyboard etc.  It will dissolve the plastic with disastrous
> results.
>
> The screws are shipping screws.
>
> Measure the broken clear plastic window and get a piece of single ply
> Plexiglass cut to fit and glue it in place with Duco Cement or model
> airplane glue.  This glue is also good on the cover repairs as it slightly
> melts the plastic as it bonds.  Just dont squeeze the parts together
> tightly as that defeats the bonding action.  Glue and splint is exactly
> correct.  Let fully cure overnight.
>
> The Plexiglass wont have the sharp edge to tear the paper, but you can
> still get by with it fine.
>
> The machine looks very clean for an older model.  The biggest issue
> besides broken parts with be congealed grease on any sliding parts.  I use
> Breakaway lightly and carefully after determining what is sticking.
>
> You can find most 33 problems by visual means.  Turn the fan on the motor
> toward the front and watch the action in the printer.  No adjustments until
> you have eliminated any problems you see visually.
>
> Have fun,
>
> Wayne
> KB1FDW
>
>
>
>
>
>  -----Original Message-----
> From: Jones, Douglas W <douglas-w-jones at uiowa.edu>
> To: greenkeys <greenkeys at mailman.qth.net>
> Sent: Tue, Nov 26, 2013 1:57 am
> Subject: [GreenKeys] ASR 33
>
> I've finally had the chance to strip the covers off the ASR33 here at
> the U of Iowa.  I took some photos of the guts:
>
> The guided tour of the machine is here:
> -- http://www.cs.uiowa.edu/~jones/pdp8/UI-8/guide.shtml#TTY33
>
> Of more interest, here is the log for the day's work:
> -- http://www.cs.uiowa.edu/~jones/pdp8/UI-8/log.shtml#2013-11-25
>
> It looks like the broken paper-tape reader will be straightforward to
> repair -- someone probably tried to use it as a hand-grip for lifting the
> machine.  Bad idea.  But, there's ample space inside for some steel
> angles, and I can easily cut, drill and tap steel to attach it all without
> adding bulk anywhere that interferes with anything.  (That's under the
> Bug 7 topic.)
>
> What is the plastic used for the cover?  PVC?  ABS?  It's pretty filthy,
> and I wonder if mild soap is the strongest thing I should use, or
> is there something like Windex recommended.
>
> Knowing what the plastic is would also help figure out how to deal
> with broken prongs -- some of the hinged lids have these, and in most
> cases, we have the pieces.  If ABS or PVC, we can glue and splint
> them with the right solvents.
>
> Bug 17 is a greater concern.  The window in the top of the cover is
> cracked and entirely loose.  It seems to be a different kind of plastic.
> Does anyone know what kind?  Repair or replace, that is the question.
>
> Oh yes, in this photo, you can see some whopping big screws that
> someone tossed into the chassis under the paper-tape punch.  What
> are they?  Shipping screws perhaps?
> -- http://www.cs.uiowa.edu/~jones/pdp8/UI-8/2013/11/25-TTYrear.JPG
>
> Any and all advice would be appreciated.
>
>            Doug Jones
>            jones at cs.uiowa.edu
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