Color LaserJet M750dn printing faint in all colors

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  • KJEpps
    Senior Tech

    50+ Posts
    • Jun 2012
    • 63

    #1

    [CQ] Color LaserJet M750dn printing faint in all colors

    I printed the Print Quality Troubleshooting pages and all colors are evenly faint (no streaks or lines). I checked to make sure the printer was plugged into the wall and not a surge suppressor. I cleaned the interior, checked the high voltage contacts, and ran the Laser Glass cleaning procedure. I also ran a full calibration. None of this worked. Then I went into Preboot and cleaned the disk then updated the firmware to the latest 2305090_000473. Still didn't work.

    The customer is using HP brand toners. The Transfer Kit is at 90% remaining and in good shape, so it's hard to imagine that it is defective. Should I try one or both of the High Voltage Power Supplies? It has an Imaging HV PCA and a Secondary Transfer HV PCA? Which would you try? Or both?
  • theengel
    Service Manager

    1,000+ Posts
    • Nov 2011
    • 1784

    #2
    Re: Color LaserJet M750dn printing faint in all colors

    Is an NVRAM dump possible on these? You might try that, although, I can't see how all of that wouldn't happen in a firmware upgrade.

    Anyway, it's more likely the transfer than a power supply.

    Comment

    • KJEpps
      Senior Tech

      50+ Posts
      • Jun 2012
      • 63

      #3
      Re: Color LaserJet M750dn printing faint in all colors

      The customer opted to try the Transfer Kit first. He just notified me that it didn't fix the problem, so I'll be ordering the HVPS's.

      I'll keep you posted...

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