|Printer and Photocopier Troubleshooting and Repair Collection : So you took your printer apart....
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Dot Matrix and Daisy-Wheel Printers
"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 (firstname.lastname@example.org).)
Greetings. A few:
- 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?
- 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? :-)
- 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!)
- Did you reconnect all the cables? Is the front-panel (display+buttons)
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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