Question about Xerox Phaser 8500/DN Printer

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8500 phaser timing

Still have timing problem. Gears grind when starting up.
I have set the module of gears on the right side, holes lined up in gears and lower gear at arrow. Upper gear hole up and a little to left. Head free and wiper down. Gears on left all run free and square block cleaned. Any thing else I need to do? It did pass a page clear through a couple of times. Jams either in front or with page half out of top. Then stops with an error.
Errors I have gotten, 4,024.45:6975......08, 035.42:6975.......08,025.41:6975 in that order.
The maintenance module moves up and down and the drum turns off and on. Could it be a firmware problem? I have reset the Navram from the menu. Thanks for any and all help so far. Steve

Posted by stevefxxx on

  • 1 more comment 
  • stevefxxx Aug 13, 2008

    Thanks for your reply.

    What can I do with or about the pressure plate?

    I don't know where, what it is or what it does.


  • stevefxxx Aug 13, 2008

    Thanks for your reply.
    What can I do with or about the pressure plate?
    I don't know where, what it is or what it does.


  • stevefxxx Aug 13, 2008

    Thanks again.

    There was a chunck of cooled off ink under the plate.

    Earlier I found the black ink tray was pushed out of place and could have alowed it to leak.

    Problem fixed.........




1 Answer

Rick Kasper

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Doubtful its the firmeware. The maintenance kit pressure plate with sensor is most likely the problem. Once teh process drive is times and aligned properly then the pressure plate is really the only thing left.

Posted on Aug 13, 2008

  • Rick Kasper Aug 13, 2008

    It is the black flat plastic piece under teh maintenance kit that lifts it up and down. Located to the left and below the maintenance kit.



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Step Questions and Actions Yes No
1 1.
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[email protected]

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Hi eduardo580:
This your problem.

7,010.43: The printhead is stuck in the tilted position, or is not able to tilt forward to the print position, due to problems.

1 1.
Reboot the printer.
2. Did this correct the problem? Complete. Go to Step 2.
2 1. Do the printhead lock arms rotate correctly? Go to Step 3. Repair/replace
the lock arms.
3 1. Has ink spilled ink around the printhead that
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manually push the printhead right to left.
Clean the printhead area. Go to Step 4.
4 1. Does the X-axis motor drive the printhead to
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Go to step 5. Troubleshoot the X-axis drive.
5 1. Check the process gearbox for obstructions or damaged.
2. Ensure the gears are correctly aligned and homed.
3. Verify the process shaft and drive module shaft are at their home positions.
4. Did this correct the problem? Complete. Go to Step 6.
6 1. Has ink spilled on the head tilt gear on its
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Clean the gears. Go to Step 7.
7 1. Use service diagnostics to run the Head Maintenance Wiper Clutch test.
2. Did the test fail?
Replace the wiper drive clutch. Go to Step 8.
8 1. Ensure the wiper is properly aligned.
2. Use service diagnostics to run the Wiper Drive Test.
3. Did the test fail?
Replace the exit module assembly. Go to Step 9.
9 1. Use service diagnostics to run the Load Maintenance Clutch test.
2. Did the test fail?
Inspect the maintenance drive system,
replace any defective parts. Go to step 10.
10 1. Verify the headtilt gear will engage. You can
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2. Is the gear engaged properly?
Go to Step 11. Set the headtilt gear.
11 1. Use service diagnostics to run the Tilt Axis Drive test.
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1 Answer

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Thank you

John C

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1 Answer

Xerox Phaser 8500n 70,010.43

A little bit of ink in that area can be normal. Although I would clean it out if I were in there.
To remove the print head, you have to remove that block. Then on each side of the print head there is a plastic bracket held in with one screw on each side. They are brass torx screws, they just lift out of the frame on each side of the print head, they are the print head latches.
You mention the head tilts backrward fine, but don't mention it moving forward. Does it get within about 1/4 of an inch of the drum? Is shoul dmove frely forward also. But removing it may be find the problem.
Remove the loose ink.
One other thing to check is the process drive motor. It is mounted on the right side of the machine and has a gear cluster on it. On the clear plastic are timing holes to ling up the gears to the frame. You can just pin them with paper clips. You have to remove the motor to do that correctly, 4 screws and some connectors run across the assembly. Remove it and pin the gears through the holes and when installing make sure the arrow on the frams lines up with the one on the assembly.

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