[GreenKeys] Model 33 progress (II)

[Paul Pennington]

I had good luck with Fedron.  Make sure you use it outside and try not to
breathe the fumes.

Paul Pennington
Augusta, Georgia


On Tue, Feb 28, 2017 at 11:14 AM, Brad via GreenKeys <
greenkeys at mailman.qth.net> wrote:

> I’ve finally gotten around to hooking my Model 33 up to a computer (one of
> my SWTPC 6800s).  When I left it, I had it mostly working (many thanks to
> Wayne!).  A few glitches included one or two characters that don’t come out
> right consistently (L comes out as M usually, for example), a tendency when
> plugged in/running for more than 30 min for output to suddenly become
> gibberish (and return to normal after a 1-2 hour cooling period) and of
> course my hardened platen which can’t move paper.
>
>
>
> To address the last one, I was looking at something like this:
>
>
>
> http://www.mgchemicals.com/products/cleaning-products-
> for-electronics/cleaners/specialty-cleaners/rubber-renue-408a-408b
>
>
>
> Don’t know how you guys feel about that particular one.  Seems like it
> would do the job.  My platen isn’t cracked or broken, just really smooth
> and has almost no grip.
>
>
>
> I don’t have a fix for the ‘overheat’ problem – I suspect it is the larger
> of the two caps in the machine – but I don’t have enough skill to test.
> I’m going to order a brand new replacement and see what happens.
> Resistors, etc all seem ok.
>
>
>
> The character problem seems to be something local.  If I hit L, which to
> the SWTPC means Load, the 33 will produce an M but the machine pauses just
> like it’s supposed to when trying to load something in.  If it were
> actually sending an M I ought to be able to start entering a memory address
> to look at, but it freezes the console as it’s supposed to and I can’t do
> that.   Also, if I run a test program that produces every character the
> 6800 can send out, L comes out exactly as it should.  I’m thinking this is
> just something sticking in the printer – when it’s running a string of
> characters at high speed I think it gets just enough momentum to fire out
> an L, whereas typing individual characters isn’t sufficient.  The fact that
> the machine seems to think I’m sending an L even when it prints an M
> locally suggests the encoding system on it is working fine.
>
>
>
> Apart from that, there are some other ‘bugs’ – my paper tape reader is
> missing its power supply (I am ready to buy if anyone comes across one),
> and the punch is definitely not putting out everything like it’s supposed
> to.
>
>
>
> Thanks again to everyone including Wayne who helped previously to get it
> to this point!
>
>
> Brad
>
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