General Printer Problems
Panasonic 1124 power supply problem
The following, of course, also applies to many
other printers and other electronic equipment, for that matter.
"I have a Panasonic 1124 printer which
keeps blowing the only 250V 3A fuse on board. The fuse burns as
soon as the power is turned on.
I unhooked the components which connect to the logic board - i.e.,
printhead and tractor feed.
Is it possible that the problem is in the power supply? If it is,
what can it be? (The bridge rectifier consists of four hefty diodes)."
(From: Bruce A Haugh (yrp456@freenet.mb.ca).)
With the power supply disconnected from the rest
of the printer circuits, blows the fuse, the problem is with the
power supply. I have a Raven PR-9101 (made by Panasonic) that has
the exact same symptoms. Turns out that one of the secondaries on
the power transformer has shorted. You'd need schematics to confirm
voltages.
(From: Robert McCallum (simply@sk.sympatico.ca).)
I've fixed quite a few panasonic printers and
yes 90% of the time when the machine is dead, it's one or more of
the bridge diodes.
(From: Kerry Messana (messana@capital.net).)
It's fairly simple to diagnose where the problem
is originating. If you unplug (if possible) the output cable from
the power supply and it still blows the fuse then the power supply
is at fault. As for what could be wrong, well, I am not familiar
with the particular supply. If it is a linear supply a good place
to start is the bridge circuit. If it is a switching supply you
could also start there but there are more possibilities further
on.
(From: John A. McCulloch (advp@notnow.com).)
Another very common problem with the whole Panasonic
11XX series of printers is the zener diode and pass transistor.
When the diode shorts, the transistor blows, and I mean *blows*!
Cannon LBP-8 A1 Printer 40 and 22 errors
(From: GTRIST (gtrist@aol.com).)
The 40 and 22 errors normally refer to a problem
with the cabling etc. Make sure that you have it cabled properly.
Also, it can be a bit tricky changing from parallel to serial I/O.
Make sure that it is indeed selected.
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