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  1. #1
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    Angry Just bought a DoA Phaser 7800 GX

    Hey all,
    I'm new to the site and figured I'd ask for some recommendations on my dilemma.

    I recently purchased a Phaser 7800 Gx online and was told it was guaranteed to work on arrival. The guy I purchased it from was transparent and told me that the hard drive was loose and I would need to secure it better somehow, but the machine prints if it is plugged in. For the price (1500) i was good with it and told him it was fine.

    So i receive the printer, and try to boot it up and get a no hard drive error with a blue screen. Ok. So i slide out the board. plug it in. Now it reads "Internal Communication Failure. Please call for assistance".
    Not very helpful.
    So i take off the shroud, and notice a blinking green led. It pulses for a few and then pauses and resumes the same error pattern. I had no idea xerox was so defensive of their service manuals but I came across mine with a little digging.

    Supposedly this machine can boot without a hard drive. This goes contradictory to what the guy said when he sold it to me.
    The 6 blinks and pause according to the service manual states that the control panel cannot communicate with the main board. I find it weird the control panel would be faulty if it gave me blue screen errors about not having a hard drive followed by a generic "internal communication failure". Where it fails at is upon the FPGA boot up checks yet the FPGA is not indicated as a problem or else the led would have blinked 3 times.

    So am i wrong to think that the control panel needs replacing even though the screen displayed a couple blue screen errors? Could it be the socket on the board where the control panel mates with it?

    Any advice on this model would be appreciated.
    -Russ

  2. #2
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    Re: Just bought a DoA Phaser 7800 GX

    I would start with an altboot with the latest firmware.

  3. #3
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    Re: Just bought a DoA Phaser 7800 GX

    Quote Originally Posted by Flash View Post
    I would start with an altboot with the latest firmware.
    It doesnt even get to that point.

    no fans kick on at all. Just the led health indicator blinking 6 times on the main board.

  4. #4
    Senior Tech 250+ Posts
    Just bought a DoA Phaser 7800 GX


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    Re: Just bought a DoA Phaser 7800 GX

    Sounds like an LVPS went bad.

    There was also a bulletin out, about a blank display (Dead Machine) due to a bad SD card.
    Change SD card and then perform ALTBOOT with latest firmware.

    Not sure which applies to you

  5. #5
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    Re: Just bought a DoA Phaser 7800 GX

    Try unplugging the RAM. Clean the gold plated contact of the RAM using an eraser. Good luck

  6. #6
    Service Manager 10,000+ Posts
    Just bought a DoA Phaser 7800 GX

    Phil B.'s Avatar
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    Re: Just bought a DoA Phaser 7800 GX

    Quote Originally Posted by rrutter81 View Post
    It doesnt even get to that point.

    no fans kick on at all. Just the led health indicator blinking 6 times on the main board.
    no ALTBOOT is a firmware loading procedure.

  7. #7
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    Re: Just bought a DoA Phaser 7800 GX

    Quote Originally Posted by Phil B. View Post
    no ALTBOOT is a firmware loading procedure.
    Yes i have the usb stick.

    The issue is it fails the Power On Self Test (POST) sequence.
    No energy star logo, no fans, no nothing.

  8. #8
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    Re: Just bought a DoA Phaser 7800 GX

    Quote Originally Posted by shinchan View Post
    Try unplugging the RAM. Clean the gold plated contact of the RAM using an eraser. Good luck
    Yea i checked the sdcard (i cant read it due to the partition being wrong?) i chalked it up as an encrypted sd card, reseated the ram (contacts are clean), reseated the hard disk. Nothing.

  9. #9
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    Re: Just bought a DoA Phaser 7800 GX

    Quote Originally Posted by rockdude View Post
    Sounds like an LVPS went bad.

    There was also a bulletin out, about a blank display (Dead Machine) due to a bad SD card.
    Change SD card and then perform ALTBOOT with latest firmware.

    Not sure which applies to you
    This doesnt quite explain the 6 blinks on the mainboard led health indicator. Also it isnt a blank display.

    bluescreen.jpg



    Screen Shot 2018-05-29 at 2.33.22 PM.jpg

    Not sure if i should trust the control panel cant communicate or if it is a board problem.
    SD Card might be bad but why would it send me down a rabbit hole?

    Thanks guys for your help

  10. #10
    Service Manager 10,000+ Posts
    Just bought a DoA Phaser 7800 GX

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    Re: Just bought a DoA Phaser 7800 GX

    Quote Originally Posted by rrutter81 View Post
    Yes i have the usb stick.

    The issue is it fails the Power On Self Test (POST) sequence.
    No energy star logo, no fans, no nothing.
    LOOK at the manual...

    ALTBOOT is for loading firmware when the machine doesn't go to the ready screen.

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