Just bought a DoA Phaser 7800 GX

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  • rrutter81
    Technician
    • May 2018
    • 28

    [Dead] 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
  • Flash
    Trusted Tech

    250+ Posts
    • May 2007
    • 378

    #2
    Re: Just bought a DoA Phaser 7800 GX

    I would start with an altboot with the latest firmware.

    Comment

    • rrutter81
      Technician
      • May 2018
      • 28

      #3
      Re: Just bought a DoA Phaser 7800 GX

      Originally posted by Flash
      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.

      Comment

      • rockdude
        Trusted Tech

        Site Contributor
        250+ Posts
        • Feb 2011
        • 257

        #4
        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

        Comment

        • shinchan
          Trusted Tech

          100+ Posts
          • May 2011
          • 182

          #5
          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

          Comment

          • Phil B.
            Field Supervisor

            10,000+ Posts
            • Jul 2016
            • 22808

            #6
            Re: Just bought a DoA Phaser 7800 GX

            Originally posted by rrutter81
            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.

            Comment

            • rrutter81
              Technician
              • May 2018
              • 28

              #7
              Re: Just bought a DoA Phaser 7800 GX

              Originally posted by Phil B.
              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.

              Comment

              • rrutter81
                Technician
                • May 2018
                • 28

                #8
                Re: Just bought a DoA Phaser 7800 GX

                Originally posted by shinchan
                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.

                Comment

                • rrutter81
                  Technician
                  • May 2018
                  • 28

                  #9
                  Re: Just bought a DoA Phaser 7800 GX

                  Originally posted by rockdude
                  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

                  Comment

                  • Phil B.
                    Field Supervisor

                    10,000+ Posts
                    • Jul 2016
                    • 22808

                    #10
                    Re: Just bought a DoA Phaser 7800 GX

                    Originally posted by rrutter81
                    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.

                    Comment

                    • rrutter81
                      Technician
                      • May 2018
                      • 28

                      #11
                      Re: Just bought a DoA Phaser 7800 GX

                      Originally posted by Phil B.
                      LOOK at the manual...

                      ALTBOOT is for loading firmware when the machine doesn't go to the ready screen.
                      Im telling you. The FPGA is detecting a problem with the hardware before the thing even goes to boot.

                      I tried the ALTBOOT - forced upgrade method. It does not work. It's like if you tore your ram out and tried to ALTBOOT it. I still receive the blue screen of death. I actually had to open the shroud up to see the LED health indicator light.

                      Screen Shot 2018-05-29 at 3.43.10 PM.jpg

                      I assume it is failing at step 4. I would assume the SD CARD, however, I still get the led blinking error.

                      Comment

                      • rockdude
                        Trusted Tech

                        Site Contributor
                        250+ Posts
                        • Feb 2011
                        • 257

                        #12
                        Re: Just bought a DoA Phaser 7800 GX

                        I would "CHANGE" the SD Card.

                        This is a "KNOWN" problem with this machine!

                        Part No. 160E04222 List Price $63.00 + $15.00 shipping

                        Good Luck

                        Comment

                        • rrutter81
                          Technician
                          • May 2018
                          • 28

                          #13
                          Re: Just bought a DoA Phaser 7800 GX

                          Originally posted by rockdude
                          I would "CHANGE" the SD Card.

                          This is a "KNOWN" problem with this machine!

                          Part No. 160E04222 List Price $63.00 + $15.00 shipping

                          Good Luck

                          thanks for the advice. its top on my list!

                          Comment

                          • rrutter81
                            Technician
                            • May 2018
                            • 28

                            #14
                            Re: Just bought a DoA Phaser 7800 GX

                            Just an update.

                            I replaced the sd card and have the same 6 blink led error. I had a hunch that wasn't the problem as the led blinking indicator shouldn't be giving false positives. I at least have 3 copies of this sd card so I don't have to pay the premium for it anymore.

                            If you read this, just do a sector by sector copy of the sd card and you won't have to pay the outrageous prices of a simple sd card.

                            I will be ordering a replacement control panel (which I believe is the issue) and see if that solves it.
                            Last edited by rrutter81; 06-02-2018, 12:34 AM.

                            Comment

                            • rrutter81
                              Technician
                              • May 2018
                              • 28

                              #15
                              Re: Just bought a DoA Phaser 7800 GX

                              Well.
                              I replaced the control panel and still have an internal communication failure. LED on the mainboard still blinks 6 times and then repeats.

                              I'm kind of at a loss at this point.
                              Maybe the wiring harness is messed up?
                              The receiving board is no good?

                              I figured following the manual would have solved it.

                              Here is a video of what I am working with...

                              xerox 7800 error code on Vimeo

                              Comment

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