If the print is a dismal gray rather than a sharp black, you are
probably almost out of toner. This can manifest itself evenly across the
entire page or in splotches or stripes, depending on the printer.
Sometimes you can wring a little bit more out of a toner cartridge by
taking it out and gently shaking it from side to side (never up and down,
as toner can spill out). You can also try turning up the printer’s
contrast adjustment, if it has such a knob (usually on the back side if it
exists). Faded print can also result from a dirty corona wire, because a
dirty wire inhibits a full electrical charge from being passed.
If the printouts are consistently varied in density, and you have to
frequently remove the toner cartridge and shake it to redistribute the
toner inside it, make sure the printer is sitting on an even, flat
surface.
Horizontal black lines
A horizontal black line on the printout is probably the result of a
dirty or damaged roller. There are lots of rollers in the printer, and you
can use the space between the lines on the page to determine which roller
is causing the problem. Measure the distance between the errant black
lines on the page and then use Table A to determine which part
might be causing the problem.
Table
A
Distance
between lines
Faulty
part
0.5”
Registration
assembly
1.5”
Upper
registration roller
1.75”
Lower
registration roller
2.0”
Toner
cartridge developer roller
2.56”
Lower fusing
assembly roller
3.16”
Upper fusing
assembly roller
3.75”
Toner
cartridge photo drum
Regularly spaced splotches
If there are evenly spaced black spots but they don’t extend all the
way across the page, the problem is probably a scratch or flaw in the drum
or a build-up of toner on the fusing roller. If the spots are less than
three inches apart vertically, it’s probably the drum, because the drum
has a larger diameter than the fusing roller.
Vertical black line on edge of page
This can indicate an almost empty or faulty toner cartridge or (less
frequently) some spilled toner inside the printer.
Comment by dileep007, posted on Aug 28, 2008
Now that you are familiar with the printing process, you can probably
guess some of the common problems and their causes even before I explain
them. The best way to determine the cause is to identify at what point in
the process the printer is breaking down.
Loose or smeared toner
Here’s an easy one. If the toner is loose (that is, not fused to the
paper), the fuser is not melting the toner, and thus the toner is not
fusing with the paper. Make sure the fuser is heating; if not, replace it.
Similarly, smeared toner happens because the nonstick coating on the
fusing roller is scratched or has baked-on debris. You can try to clean it
with a soft cloth and alcohol, but make sure you let it cool down first!
Note
In this
article, I recommend replacing certain parts, but unless you are
a technician working for an authorized service center for that
type of printer, you might not be able to get the needed parts
easily.
Smeared output can also result when you refeed a printed page into the
printer to make a double-sided page. This happens because the rubber
rollers that grip the paper to pull it into the printer can pick up toner
from the first side’s printing and smear it.
Vertical
white areas
To fix this problem, clean the corona wires. Why? This problem is
caused by either the main corona or the transfer corona being covered with
toner in a certain spot. A quick fix is to change the toner cartridge,
even if it isn’t empty. Because the primary corona is located in the
cartridge, this will correct problems with a dirty primary corona.
To clean corona wires, use a special felt-lined tool that comes with your
printer or use an alcohol-dipped cotton swab. But be very careful! Corona
wires are thin and easy to break with too much pressure. To locate the
primary corona, remove the toner cartridge and look for an exposed wire.
The transfer corona’s location depends on the printer, but it is usually
protected with a webbing of filament threads. Not all laser printers allow
you access to the transfer corona, so check your manual if you can’t
find it.
Gray mist
If the white areas look like they have been lightly sprayed with a
gray mist, making them look slightly dirty or dingy, the problem is also
likely to be a dirty corona wire. (See the preceding section.)
This can also be the result of turning the printer’s print density
control up too high. The newer the drum, the lower this setting can be. As
the drum ages, you must turn up the print density control higher to
achieve sharp black printouts. However, if you turn it up too high, the
entire page acquires a dirty gray tinge. Some printers include the drum in
the toner cartridge, so you get a new one each time you change toner. On
other printers, the drum is separate, and you must eventually replace it
when it wears out.
Comment by dileep007, posted on Aug 28, 2008
any doubts you can reply me
i am always here to assist you
thank you
bye
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