Jittery LA36 updated
Gordon JC Pearce
gordonjcp at gjcp.net
Tue Jan 24 14:56:52 CST 2006
jim stephens wrote:
> how freely does the mechanism move on the carriage? sometimes this causes
> jitter, though not at rest.
Freely enough, with the power off obviously. There is a little
resistance as the ribbon feeds, but not much.
> look at the power to the control circuit and the drivers to the servo
> motor and
> make sure it's not about to blow, and maybe has high ripple on it if the
> is happening at rest.
It does happen occasionally. I haven't scoped the PSU rails yet but on
the odd occasion that it does jitter at rest, it doesn't sound ripply.
What I have found is that it seems to do it when the opto-interruptor is
at certain positions. Sometimes it will print 1/4 of a line, skip a
1/4, print another 1/4 and skip the rest.
I took the opto sensor assembly off and blew it out with an air duster.
This didn't help.
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