Dot Matrix and Daisy-Wheel Printers
So you took your printer apart.... "I stupidly
took apart my Panasonic KX-P1123 to attempt a head swap (the cable
was too short!), now that it's back together it just beeps when
I try to print. The only things I touched were the rod that the
head assembly slides on and the toothed belt also had to come off
(I don't think it's a timing belt.. there's no clear markings suggesting
that). When I try to print, the head moves to the center, there's
no pin action and it starts beeping at two second intervals (and
won't stop). It's not the paper sensors because they seem to work
properly...any ideas?" (From: Filip M. Gieszczykiewicz (filipg@repairfaq.org).)
Greetings. A few:
1. Make sure you didn't trap and crimp any wires
.. there SHOULD be a 'Column 0' sensor - either a photo-interrupter
or a switch. The print head will activate it during the self-init.
BTW, move the carriage all the way to the right, close the cover
and turn it on - does the print head move or does it just sit there
and beep?
2. Ensure that you have the ribbon cable correctly
hooked up between the printer & head .. some [smarter] printers
can tell... I am not sure about that one, but some printer have
an optical (IR) sensor that detects ribbon presence (or am I spoiled
with fixing $$$ printers? :-)
3. This should be obvious - but does the print
head move FREELY all the way from the left to right and back? Don't
forget to oil (not too much!) the rails!
4. Did you reconnect all the cables? Is the front-panel
(display+buttons) attached?
More depends on the answers and results of the
above. BTW, most newer dot-patrix printers just need 2 screws to
be removed to release the head. I know the Epson LQ-1050 works like
that (and many of that Stars as well). Anyones needs parts from
the former? I have one with a dead head (and it's not economical
to repair).
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