[TUHS] weird problem with our Decwriter III terminal

[TUHS] weird problem with our Decwriter III terminal

[John Chung]

I would start with the gears first. Stepper motor
testing can be done by visual inpection by running
through 1 character at a time. Mark each turn when
moving to the next character. This requires diassembly
of the casing and other visual blocking components.

John

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>    1. weird problem with our Decwriter III terminal
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----------------------------------------------------------------------
> 
> Message: 1
> Date: Wed, 21 Jun 2006 09:38:10 +0000
> From: asbesto <asbesto at freaknet.org>
> Subject: [TUHS] weird problem with our Decwriter III
> terminal ...
> To: tuhs at tuhs.org
> Message-ID: <20060621093810.GA24010 at freaknet.org>
> Content-Type: text/plain; charset=us-ascii
> 
> 
> Hi,
> 
> maybe someone here can help us - our problem is that
> the
> decwriter terminal seem to "jump" in particular
> positions
> when printing
> 
> we don't understand how to solve this problem -
> maybe this is a
> stepper motor problem, or another problem in
> gears/transmission?
> 
> the problem is evident in this image:
> 
>
http://dyne.org/museum/dec/terminals/la120/tn/dscn3488.jpg.html
> 
> does someone have an idea about this problem?
> tnx!
> 
> :)
> 
> -- 
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> End of TUHS Digest, Vol 32, Issue 15
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[TUHS] weird problem with our Decwriter III terminal

[Wilko Bulte]

On Wed, Jun 21, 2006 at 10:31:13PM -0700, John Chung wrote..
> I would start with the gears first. Stepper motor
> testing can be done by visual inpection by running
> through 1 character at a time. Mark each turn when
> moving to the next character. This requires diassembly
> of the casing and other visual blocking components.

I don't recall if this model has one of these optical position
'belts', if yes, make sure the sensor and belt are free from
debris.

Wilko