Homebrew PCBs

On Mon, 15 May 2006 22:40:02 +0200, gjm45janssen  
<g.janssen@....nl> wrote:

> Dear Richard, Stefan,
> Indeed, I do not see the main problem in the tray tranport at the
> moment. It is more the timing of the transport which is bothering me.
> What I mean is the following. When a print command is given with the
> unmodified printer,  (1) a new page is taken from the paper tray; (2)
> this page operates a lever switch and the paper roler starts to turn
> to transport the paper; (3) the paper is printed. If the timing
> between events is not correct, it is not going to work. For example if
> I put a page in the modified printer (flat path and paper holder etc.
> removed) past the lever switch, the paper roller tranports the paper
> out of the printer. There seems to be a critical timing between (1)
> and (2). So the synchronization between the command to print a page
> and the paper roller has to be modified. I don't know how to do that
> yet.
> With kind regards,
> Gerard


You time it before you take the printer apart, and then you use a simple  
analog timer circuit to replicate it, maybe allow for some adjustment to  
tweak it.

ST