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  1. #1
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    Phaser 7800 Fault

    Hey guys,
    Looks like my phaser is giving me another issue and you all have been my go-to over the years. Tray 4 on my phaser is giving me problems and wont allow me to print unless I leave it part-way open. The fault code on the actual display is 374.940.04 but on the server of the device it is 74-210-00. I'm guessing a lift motor on tray 4 is dead, but i do hear motors run when I close the tray. So maybe it is a gear?

    I found this package to replace it, but not sure without opening it up.
    604K20542 replaces 604K20541, 604K20540, Tray Lift Gear Kit (OEM) Xerox(R) 7500 & 7800


    Are there any procedures i can follow to replace or diagnose what is the actual issue? I've already replaced numerous things on the phaser over the years like the imaging unit and what-not but I havent ever messed with the tray assembly.
    Any assistance would be greatly appreciated!
    -russ

  2. #2
    Service Manager 10,000+ Posts
    Phaser 7800 Fault

    Phil B.'s Avatar
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    Re: Phaser 7800 Fault

    Quote Originally Posted by rrutter81 View Post
    Hey guys,
    Looks like my phaser is giving me another issue and you all have been my go-to over the years. Tray 4 on my phaser is giving me problems and wont allow me to print unless I leave it part-way open. The fault code on the actual display is 374.940.04 but on the server of the device it is 74-210-00. I'm guessing a lift motor on tray 4 is dead, but i do hear motors run when I close the tray. So maybe it is a gear?
    Are there any procedures i can follow to replace or diagnose what is the actual issue? I've already replaced numerous things on the phaser over the years like the imaging unit and what-not but I havent ever messed with the tray assembly.
    Any assistance would be greatly appreciated!
    -russ
    is there any paper stuck at the tray sensors?

    have you checked the feed tires?

  3. #3
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    Re: Phaser 7800 Fault

    Quote Originally Posted by Phil B. View Post
    is there any paper stuck at the tray sensors?

    have you checked the feed tires?
    Hey Phil,
    Thanks for the reply.
    I dont see anything amiss when i pull the tray out.

  4. #4
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    Re: Phaser 7800 Fault

    For fun, I replaced tray 4 with tray 5 and the error follows the tray itself. So placing tray 4 in to the tray 5 slot gave me a tray 5 error.

  5. #5
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    Re: Phaser 7800 Fault

    Ok i found the culprit. One of the plastic gears broke off in back for whatever reason.
    /sigh
    this printer loves to break a lot ��

  6. #6
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    Re: Phaser 7800 Fault

    Quote Originally Posted by rrutter81 View Post
    Hey Phil,
    Thanks for the reply.
    I dont see anything amiss when i pull the tray out.

    Isn't tray 4 the same as tray 3? swap trays 3 and 4. I bet the problem follows the tray. The lift gear assy on the the side of the tray is messed up. Either broken or just out of place. Should be easy to replace if needed.

  7. #7
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    Re: Phaser 7800 Fault

    Quote Originally Posted by Jettdog View Post
    Isn't tray 4 the same as tray 3? swap trays 3 and 4. I bet the problem follows the tray. The lift gear assy on the the side of the tray is messed up. Either broken or just out of place. Should be easy to replace if needed.
    Yeah. I ended up doing what you suggested and found one of the gears was broken. Thanks!

  8. #8
    Senior Tech 250+ Posts jhalfhide's Avatar
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    Re: Phaser 7800 Fault

    The new gears now come with a metal backing to them to stop them breaking.

    Part number 604K20543

    Sent from my LYA-L09 using Tapatalk

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