Question about Xerox Phaser 8400 Laser Printer

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8400 blurry print

Printer intermittantly prints blurry pages ( looks like you are reading thru someone else glasses). tried running cleaning procedures for light streaks and smeared pages. Also replaced maint. kit. 3 days later printer started doing it again.

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  • Anonymous Sep 26, 2008

    I couldn't get the square stainless steel piece to come out.

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I had a similar problem. I discovered that the imaging drum was too hot. There is a temperature sensor that rides on the drum surface to monitor the temperature. You can see it if you lift the exit cover on the right side. The sensor is white, and has a thin probe which rides on the drum surface. There's a single screw accessible from the right side which holds it in place. A hole on that side will allow a screwdriver (torx) to access the screw and the little unit can be removed (be patient- it can be done!). Clean the probe with some alcohol and replace it. The problem is caused when the ink on the drum smears because it's too hot. Dirt (wax and oil)under the sensor probe prevents contact with the drum, and makes the printer think the drum is too cold.

Posted on Apr 08, 2008

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What is happening is that the print head is not moving completely into the proper position and making the image to far away from the drum.
One of 2 things.
1. From the front, if you remove the left side cover. On the lower part of the frame about mid way back, you will see a stainless steel block about 1 inch by 1 inch square. it may be getting some ink in it and not pivoting back and forth smoothly. You can slip off the spring assembly over it, latch it up and to the left, away from the block. remove that block and clean it well.
2. Remove both the right and left side covers, and then the ink cover, then ink loader. The ink loader is just clipped in, and has 2 connectors on it. The second thing that could be happening is the cables to the print head may be hanging up, causing the print head to be out of position.
Between those 2 things, those would be a 95 percent cause of your issue.

Posted on Mar 31, 2008

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Posted on Jan 02, 2017

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Yeah I just read a tip. There seems to be a problem with the wave amp board, I will send you the engineering note. Sometimes though that encoder needs replaced and cleaning is not the total fix. The encoder may need replaced, but I found this also.

I just received this, this morning.



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Solution: thumbsup.gif Fixed! thumbsdn.gif Did not fix. Historically blurry print was caused by oil on the drum encoder wheel. This can be caused by the wave amp board. A cracked capacitor on the board causes the wave amp to produce a malformed amplified wave signal to the printhead. This in turn causes the printhead to eject ink at the wrong times, so the prints look blurry.

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