Any HP Printer Engineers?
Discussion
Plotloss said:
Laserjet 1150 smearing.
Bit like the toner isnt fusing properly before it goes through the final set of rollers so you get a ghost image repeated down the page.
Bit like the toner isnt fusing properly before it goes through the final set of rollers so you get a ghost image repeated down the page.
How far away from the actual image is the ghost image? ie how far apart are the repeats ,if you get my drift.
From the HP website:
""Ghosting
Ghosting refers to an object or letter that is repeated several times down the length of a page at even intervals. The repeated image appears as a light or dark area relative to the surrounding image. This condition most often occurs when a fine gray scale follows a large black pattern. The condition is caused by residual electrical charges left on the surface of the electro-photographic (EP) drum or a lack of toner in the developed region. Ghosting is a condition experienced in one form or another by all devices that use the EP process. Both the developer and the EP drum can produce dark or light ghosting.
NOTE: For a repeating image to be considered ghosting, the image repeating down the page must not be a result of ink from a preprinted letterhead or form. Letterhead must be able to withstand the fuser temperature of 392 degrees Fahrenheit. Refer to HP LaserJet Printers - Print Media Guide for more information on paper and letterhead specifications.
The most common form of ghosting results from a developer condition known as developer starvation. Developer starvation occurs when so much toner has been required to print the first image that the developer does not have enough time to pick up enough new toner and charge it sufficiently. Developer starvation will produce light ghosting.
Follow these corrective steps to reduce image ghosting:
Use a different pattern. Avoid patterns that use a 50 percent gray scale or a "dot-on-dot-off" pattern.
Make changes to the layout of the page so that gray scale patterns do not follow black areas. If possible, make dark patterns lighter and light patterns darker. Print the image in landscape.
Experiment with print density and Resolution Enhancement Technology (RET) settings.
Print a completely black page immediately in front of the page that is experiencing the ghosting condition. This black page must be part of the same print job so that the printer's gear train does not pause between the pages.
Check humidity and temperature: Low temperature and humidity can exaggerate a ghosting condition. Make certain that the printer's environment meets the requirements given in the printer's Users Guide. Light or dark ghosting caused by the developer is highly affected by environmental conditions.
Print at 300 dots per inch (dpi).
Important items to remember when dealing with ghosting issues:
In most cases of light ghosting, changing the print cartridge will not help the condition. Replacing the print cartridge, since the EP drum or charging roller may be damaged may correct dark ghosting caused by the EP drum.
Since ghosting is mainly an issue with the EP process, switching HP LaserJet printer components and assemblies will not, in most cases, correct this condition""
In my experience most instances of ghosting are caused by the toner resistant film on the fixing assy. degrading and keeping a small amount of toner on it's surface thereby causing a repeat image on the sheet as it passes through said assy.
Edited by esselte on Thursday 2nd November 12:26
The ghost image is about 3" down, from the original.
Solid greys are also coming out a bit funny.
Thing is, with a toner at £50 I'm loathed to buy one, only to discover that the printer is knackered.
What with a new network laser of better spec being £90 and a colour laser at £150...
Its tricky...
Solid greys are also coming out a bit funny.
Thing is, with a toner at £50 I'm loathed to buy one, only to discover that the printer is knackered.
What with a new network laser of better spec being £90 and a colour laser at £150...
Its tricky...
Plotloss said:
The ghost image is about 3" down, from the original.
Solid greys are also coming out a bit funny.
Thing is, with a toner at £50 I'm loathed to buy one, only to discover that the printer is knackered.
What with a new network laser of better spec being £90 and a colour laser at £150...
Its tricky...
Solid greys are also coming out a bit funny.
Thing is, with a toner at £50 I'm loathed to buy one, only to discover that the printer is knackered.
What with a new network laser of better spec being £90 and a colour laser at £150...
Its tricky...
If it's repeating every 3" then from my manual that points to the upper heating element film ( as I posted previously).Should be a cinch to change the fixer but I don't know how much it'd cost for the part.
Edited by esselte on Thursday 2nd November 13:04
Edited by esselte on Thursday 2nd November 13:05
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