C750i Poor Print quality

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  • barber782
    Trusted Tech

    250+ Posts
    • Aug 2011
    • 284

    #1

    C750i Poor Print quality

    Hi everyone,

    Got a frustrated customer with a C750i, who is not happy with the print quality.
    The customer is printing on 200gsm stock to produce booklets.
    In the other room they have a c458 which they much prefer.
    Recently they have had all drums fitted and transfer belt.
    Counter for colour is around 500k, black 100k.
    Nothing Settings wise under service mode has been modified other than software switch 153 set to 40.
    Firmware is on GC2-RF.
    Using latest PCL universal driver (have tried PS)
    Tried printing file directly from USB with same result.
    Grads look OK, maybe on the blotchy side (especially black.).
    Density calibration has been done.
    Genuine tone used.

    ​​​​I have attached photos of samples from both machines.
    The darker and spotty/grainy image is from the c750i.

    Is this what you'd expect in terms of quality for this machine? Or am I missing something?​
    Attached Files
  • copytechman
    Senior Tech

    Site Contributor
    500+ Posts
    • Nov 2008
    • 934

    #2
    Weight settings correct for media? If so tweak 2nd transfer values? Just a thought. How does it look on plain paper? (mentioned blotchy gradations, 2nd transfer again)

    A.

    Comment

    • blackcat4866
      Master Of The Obvious

      Site Contributor
      10,000+ Posts
      • Jul 2007
      • 23006

      #3
      I read somewhere here that there are software switch settings that do improve the image quality. Search for i-series imaqe quality.

      Did I copy out the switch settings? Sorry, I can't find it right now.

      Here it is:
      https://www.copytechnet.com/forum/te...e-series-color
      If you'd like a serious answer to your request:
      1) demonstrate that you've read the manual
      2) demonstrate that you made some attempt to fix it.
      3) if you're going to ask about jams include the jam code.
      4) if you're going to ask about an error code include the error code.
      5) You are the person onsite. Only you can make observations.

      blackcat: Master Of The Obvious =^..^=

      Comment

      • Ziggy
        Senior Tech

        Site Contributor
        VIP Subscriber
        500+ Posts
        • Feb 2018
        • 711

        #4
        sw188 to hex 80 and sw153 to hex 20. reboot and run gradation

        Comment

        • Max
          Senior Tech

          500+ Posts
          • Oct 2011
          • 556

          #5
          sw188 to hex 81 I believe. Try on plain paper, if improves then try copytechman suggestion

          Comment

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