LaserJet 4 Plus: Two unwanted black lines.

[Mike Parsons]

Our LaserJet 4 Plus has developed a fault in printing from XP or
self-test:

XP, e.g. Word, or self-test print.
Plus two 5mm horiziontal black lines: 40mm from top and 35mm from
botton of page.

I have switched off the printer.
I removed toner cartridge, moved it from side to side and up and
down and replaced cartridge.

No change.

Any ideas?

Thanks.

Mike

 

[Flasherly]

Our LaserJet 4 Plus has developed a fault in printing from XP or
self-test:

XP, e.g. Word, or self-test print.
Plus two 5mm horiziontal black lines: 40mm from top and 35mm from
botton of page.

I have switched off the printer.
I removed toner cartridge, moved it from side to side and up and
down and replaced cartridge.

No change.

Any ideas?

Thanks.

Mike

Apologies first -- I'm only an unqualified fellow laserer, not a
technician: the strip below the optical drum that lends a charge to an
incoming sheet of paper (from the oppositely charged element inside
the toner unit, charging toner particles) is "somehow" conveying a
relative charge of imprecision, to allow lines 45mm and 35mm
equidistantly juxtaposed on every ruined printed page. Recommended
cleaning procedure for the charging strip, is that it only be cleaned
by wiping with the same paper normally fed for printing, which may or
not be of any help. Which brings to mind the thermal unit. Apart from
how the lines as subsequently printed strips are first impressed and
received by the heater unit, from a charged body of toner now attached
to the page, makes no sense given a new cartridge, unless there's
toner reserves elsewhere, outside the cartridge, and the insides of
the printer isn't clean.

 

[Mike Parsons]

Apologies first -- I'm only an unqualified fellow laserer, not a
technician: the strip below the optical drum that lends a charge to an
incoming sheet of paper (from the oppositely charged element inside
the toner unit, charging toner particles) is "somehow" conveying a
relative charge of imprecision, to allow lines 45mm and 35mm
equidistantly juxtaposed on every ruined printed page. Recommended
cleaning procedure for the charging strip, is that it only be cleaned
by wiping with the same paper normally fed for printing, which may or
not be of any help. Which brings to mind the thermal unit. Apart from
how the lines as subsequently printed strips are first impressed and
received by the heater unit, from a charged body of toner now attached
to the page, makes no sense given a new cartridge, unless there's
toner reserves elsewhere, outside the cartridge, and the insides of
the printer isn't clean.

I cleaned inside the laser printer with a paper cloth and the black
lines continued to print.

I changed the cartridge and the black liines did not print.

Hurray!

Thanks for your help.

Mike

 

[Fred]

Sounds like the fuser if the lines appear in all printouts.
Fred