HP 940c Alignment Issue - Need ideas

[Tom D.]

I have an HP 940c which has been great until now. Recently had it in storage for almost 2 months. When I started it up again the graphics are now printing misaligned. Went through the alignment procedure, but row "B" on the alignment sheet never comes close to being aligned.
I take this to mean that it is so far out that software alone won't solve it. I changed the cartridges as a precaution, but no luck.
Any idea how this happened or how to fix it - could find no information anywhere.


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[Fred McKenzie]

I have an HP 940c which has been great until now. Recently had it in storage
for almost 2 months. When I started it up again the graphics are now printing
misaligned. Went through the alignment procedure, but row "B" on the
alignment sheet never comes close to being aligned.
I take this to mean that it is so far out that software alone won't solve it.
I changed the cartridges as a precaution, but no luck.
Any idea how this happened or how to fix it - could find no information
anywhere.

Tom-

I'm not familiar with the 940c. Many printers have an ink head that
travels back and forth on a metal bar. It prints a line of characters
left to right, and then prints a reversed line when traveling right to
left.

If there was any kind of oil on the metal bar, it could collect paper
dust. Some oil might also oxidize with the same result of slowing down
the print head as it travels across, so characters printed one way might
not line up with those printed during the return trip.

If this happens to be the case, the solution may be to clean the bar.
There may be a proper kind of lubricant to use, but it might also be
designed so plastic riding on polished metal doesn't need any.

Fred

 

[John]

Tom-

I'm not familiar with the 940c. Many printers have an ink head that
travels back and forth on a metal bar. It prints a line of characters
left to right, and then prints a reversed line when traveling right to
left.

If there was any kind of oil on the metal bar, it could collect paper
dust. Some oil might also oxidize with the same result of slowing down
the print head as it travels across, so characters printed one way might
not line up with those printed during the return trip.

If this happens to be the case, the solution may be to clean the bar.
There may be a proper kind of lubricant to use, but it might also be
designed so plastic riding on polished metal doesn't need any.

Fred

For the series HP900 , HP recommends not to lubricate the rod. The bar
has a brass bushing that has natural lubrication but I would recommend
cleaning it with WD40. I have applied lubrication and the cartridge
carrier became noisy.