Question about Xerox Phaser 8400 Laser Printer

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Xerox Phaser 8400 problems with vertical alignment

Hello We have been using our Xerox Phaser 8400B without problems for a while (3 years now)  but for the last year, we are having problem with vertical miss-alignment  of the 4 colors (including black). We change the roller for higher print count and it was working OK for a while then again, the color start shifting vertically  making looks like out of focus. The printing material looks like an EKG machine  on a tight spread.  Can anybody help us? Thanks

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  • mmijp Jul 21, 2008

    Here is a sample of the problem:



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Most likely the drum endbell has come loose. You see, the motor drives the endbell which is connected to the drum. When the endbell gets lose (which can happen) the drum (and thus the drum surface) get our of step. It causes artifacts just like this. It would be really hard for this to be anything but the endbell slipping out of the drum. You may be able to see this if you look closely or listen. It might make a scratching sound. anyway, just my guess.

Posted on Mar 04, 2012

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That can be one of two things.
1. There is a drum encoder on the end of the drum motor.that picks up silicon lubricant from the maintenance kit roller. Normally removing it and cleaning it will resolve the issue, sometimes it needs replaced.
2. There is a print head block that can become dirty and not allow the print head to get into the proper printing position, but that most likely would cause an 07,10.043 code and shut down. I really suspect a dirty/contaminated encoder.
The encoder is on the right side of the machine looking from the front, once you locate the drum shaft you will see it. Sort of flush it out with alcohol and allow it to dry, put it back in and you should resolve your problem. If not let me know.
If you need to order one the part number with diagram is on, under downloads and documentation, there is an online parts list for that machine.

Posted on Jul 22, 2008


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Parts possibly bad are the NVM, the Print Head or the Electronics module.
Hard without a manual to determine, all are expensive.

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