Question about Epson AcuLaser C900 Printer

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Print format changes during print

We have replaced all the consumables on the printer including the transfer unit and fuser but we still have the problem of text randomly appearing in Bold or in a larger type font or blured within a document we have changed the paper but still have the problem any ideas please

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Try removing the printer from your system. Delete it from "Printer and Faxes" and delete the driver components. Unplug the USB from the printer and reboot the computer. Download a new driver from Epson's web site and install it on your PC.

Follow the instructions during the install process for plugging in the USB etc. Once finished, run a test print and check the results. If the situation is no better, then the chances are there is a hardware problem.

Try a new USB cable and if there is still no change you can be fairly sure the issue lies with the printer. This is likely to mean that the main board of the printer is faulty and starting to break down. A C900 may not be worth the cost of fixing the issue, but if you can get a used unit off ebay or similar with a different problem, you could use the used parts to rectify your machine.

Posted on Nov 10, 2008


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It sounds like your main board (the brains) in the printer is fried (I got the same problem with mine). That part (when purchased new) costs so much, your better off just getting a new printer, and it's not your typical user serviceable part (hard to remove, many wire/plugs going to/from it).

The problem with replacing it with a used part, is that the used circuit board will still have the consumable counters in it set to old values from the printer is was pulled from, and NEW or RE-Chipped consumables will be needed to reset those back to zero again (not just the toners, but also the photo drums, fuser, and transfer belt). So, if the used board was connected to "old" consumables (nearly depleted), you won't be getting too many prints before it's asking for either new toners, photo drums, fuser, or transfer belt. The fuser and transfer belt cost upwards of $175 or more each....

How it works is like this, according to Okidata's Tech support guys. When you put a new "consumable" (toner, photo drum, fuser, transfer belt) into the printer, that main board resets the counters AND THEN it immediately blows a fuse (not a regular fuse, but a microchip fuse) in that comsumable so it can never reset the counter for that consumable again. When that consumable's counter reaches it's predetermined number of prints, the printer refuses to print until it is replaced (or it is "re-chipped" with a new fuse).

They make toner refill cartridge chips, and I think even a photo drum kit (seen it on Ebay). But I haven't found anything that would rest the fuser or tranfer belt. Let me know if you find something to reset the fuser or transfer belt.

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Try doing a "stop test." Stop the print process at various stages, and see if which component creates the defect.
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After the unit gets to the transfer belt, you should check the transfer roller and fuser.


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Hi jclaeys

Does the transfer kit include the fuser on this model? If not then it's highly likely that that's the part that needs swapping. I have also seen faulty toner cartridges produce lines so it's worth check that too.

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Hi thpep:
Here is a repeating defects ruler. Mach the first defect at the top of the page and alighn with this ruler and it will tell you what assembly is giving you the problem.

Repeating Defects
Maintenance Item Component Distance between Defects
Imaging Unit Developer Roller [YMCK] 28 mm (1.10 in.)
Drum [YMCK] 62 mm (2.44 in.)
Drum Charge Rollers 25 mm (1 in.)
IDT 1 (Y and M, C and K) 132 mm (5.20 in.)
IDT 2 all colors together 132 mm (5.20 in.)
Transfer Roller Transfer Roller 64 mm (2.52 in.)
Fuser Assembly Fuser Assembly 82 mm (3.23 in.)

Defects Associated with Specific Printer Components
Some print-quality problems can be associated with specific assemblies, the most
common problems and the associated assemblies are listed below. Also, refer to the
specific print-quality troubleshooting procedure for more information.
Imaging Unit
■ Streaks
■ Fine Lines
■ Banding in Process Direction
■ Uneven Density
■ Voids
■ Repeating Defects
Transfer Roller
■ Toner on the back side of the printed page (simplex mode)
■ Light Prints
■ Repeating Defects
■ Hot or Cold Offsetting
■ Repeating Defects

Hope this helps

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I replaced toner and now light print

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Hi katie44l:
Depending on the eviroment the printer is in depends on weather you have dust on the laser lenses. If you are in a dusty eviroment then the laser mirrors may have excessive dust on them preventing the laser beam from giving you the print quality that you need. The only way to fix this problem is to open the laser scanner motor assembly and clean the mirrors. That will require an HP certified technician to service the printer.

Image formation system
Laser printing requires the interaction of several different
technologies including electronics, optics, and electrophotographics
to provide a printed page. Each process functions independently and
must be coordinated with the other printer processes. Image
formation consists of seven processes:
Print cartridge
As the focal point of the image formation system, the print cartridge
contains toner and houses the cleaning, conditioning, and developing
stages of the process. The print cartridge contains the photosensitive
drum, primary charging roller, developing station, toner cavity, and
cleaning station. By including these components (which wear,
degrade, or are consumed) in the replaceable print cartridge, the
need for many service calls is eliminated. The special photosensitive
properties of the drum form an image on the drum surface and then
transfer the image to media.
CAUTION The print cartridge does not include a light-blocking shutter. Do not
expose the drum to light, which can permanently damage the drum.
Protect the print cartridge whenever you remove it.

Hope this helps.

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