Jittery LA36

Tony Duell ard at p850ug1.demon.co.uk
Tue Jan 24 16:21:50 CST 2006

> Hi there,
>    I've finally got the ribbons for my LA36, unjammed the pins in the 
> printhead and it is printing.  It's not quite right yet, though...
> The printhead often jitters backwards and forwards, sometimes several 
> inches.  When you hit "RETURN" it's obviously lost track of where the 
> head is, and slams it into the left-hand stop, where it sits obstinately 
>   pressed against the spring.
> Cleaning up the photosensor bit on the interrupter wheel seemed to help 
> a little.

I thinkl you're in the right area. I would grab the prints and look at 
that circuitry, stick a 'scope on the outputs of the phototransistor 
amplifiers, etc.

Oh, and do check the power lines for mains ripple!


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