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Thread: MP2555

  1. #11
    Field Supervisor 500+ Posts
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    Re: MP2555

    i had a couple of instance where the compatible toner not working properly . try make a sky shot double sided 25 copies and see if toner stays bonded if not toner is no good to use.

  2. #12
    Field Supervisor 500+ Posts tcypy1961's Avatar
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    Re: MP2555

    Quote Originally Posted by luca72 View Post
    iI had similar problems a couple of times on this series, it was the double thermistor that was faulty
    2 questions: 1. No error code???
    2. What role does the sleeve play??? Older copiers(which I prefer) had two rollers. Fusing a result of heat & pressure. I inspected the unit more closely(having never done so before) noticing the flimsiness of this part. What supports the sleeve??? Did not want to fully disassemble since I don’t have replacement parts. Did check pressure between the sleeve & press roller and found it to be tighter on ends than the middle but couldn’t see any swelling in press roller on ends as was stated for a possible problem. I’m going to replace the sleeve and press roller hope it resolves issue. Also noticed poor fusing is worse in duplex copying.
    Thanks!!!

  3. #13
    Technician / Shop Manager 100+ Posts JonManchester's Avatar
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    Re: MP2555

    try fresh dry paper, paper with some moisture in it would cause such issues. If you don't have fresh paper, make 20 pages of blank copies then use that paper to make 20 duplex copies to see if there is any difference.
    Live for something or die for nothing.

  4. #14
    Retired 10,000+ Posts
    MP2555

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    Re: MP2555

    Quote Originally Posted by tcypy1961 View Post
    What role does the sleeve play??? Older copiers(which I prefer) had two rollers. Fusing a result of heat & pressure.
    1. Reduced overall machine weight and therefore reduced shipping costs.
    2. Reduce energy consumption. Costs less to use.
    3. RoHS, Restriction of Hazardous Substances, compliance. Manufacturers don't get fined for non-compliance.

  5. #15
    Service Manager 1,000+ Posts luca72's Avatar
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    Re: MP2555

    Quote Originally Posted by tcypy1961 View Post
    2 questions: 1. No error code???
    2. What role does the sleeve play??? Older copiers(which I prefer) had two rollers. Fusing a result of heat & pressure. I inspected the unit more closely(having never done so before) noticing the flimsiness of this part. What supports the sleeve??? Did not want to fully disassemble since I don’t have replacement parts. Did check pressure between the sleeve & press roller and found it to be tighter on ends than the middle but couldn’t see any swelling in press roller on ends as was stated for a possible problem. I’m going to replace the sleeve and press roller hope it resolves issue. Also noticed poor fusing is worse in duplex copying.
    Thanks!!!
    I usually change the pressure roller when: either it has exceeded the pm duration, or when it is scratched where the thermistors touch, and I change those too, you don't see any codes, because the machine probably reads the wrong temperature, so that's all for it ok.

    the sleeve system, as it is conceived, mainly serves to almost instantaneously reach the melting temperature for fixing the toner... in addiction of everything slimslob said.


    I find this thing about the "non-homogeneity" of pressure roller quite unlikely
    "loneliness is an invention of the white man, when we are alone we talk to everything around us, we are never alone" (Ojibwa)

  6. #16
    Field Supervisor 500+ Posts tcypy1961's Avatar
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    Re: MP2555

    [QUOTE=luca72;2578429]iI had similar problems a couple of times on this series, it was the double thermistor that was faulty[/Would the thermistor cause insufficient heat; that is the temp not to reach set amount??? And this wouldn’t throw an error code???


  7. #17
    Service Manager 1,000+ Posts luca72's Avatar
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    Re: MP2555

    [QUOTE=tcypy1961;2582844]
    Quote Originally Posted by luca72 View Post
    iI had similar problems a couple of times on this series, it was the double thermistor that was faulty[/Would the thermistor cause insufficient heat; that is the temp not to reach set amount??? And this wouldn’t throw an error code???
    the answer is within your question, if the thermistor is out of tune, the controller doesn't know it, so it controls the heater based on incorrect data, (even a toner crust is enough)...however since there is a rindondance with a comparing the signals of the two upper ternistors at a distance, if the deviation remains in a certain range, the machine does not generate any code, but a toner fixing defect is produced.
    I would like to remember that the bulk of the sc codes that statistically involve the fuser unit are mostly related to over temperatures.
    "loneliness is an invention of the white man, when we are alone we talk to everything around us, we are never alone" (Ojibwa)

  8. #18
    Field Supervisor 500+ Posts tcypy1961's Avatar
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    Re: MP2555

    [QUOTE=luca72;2582854]
    Quote Originally Posted by tcypy1961 View Post

    the answer is within your question, if the thermistor is out of tune, the controller doesn't know it, so it controls the heater based on incorrect data, (even a toner crust is enough)...however since there is a rindondance with a comparing the signals of the two upper ternistors at a distance, t if the deviation remains in a certain range, the machine does not generate any code, but a toner fixing defect is produced.
    I would like to remember that the bulk of the sc codes that statistically involve the fuser unit are mostly related to over temperatures.
    So I’m looking at all the thermistors(4)???

  9. #19
    Service Manager 1,000+ Posts luca72's Avatar
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    Re: MP2555

    [QUOTE=tcypy1961;2582863]
    Quote Originally Posted by luca72 View Post
    So I’m looking at all the thermistors(4)???
    Usaly the faulty termistor are those at contact, the othet have different code, and rare possibilità of out trim or fault
    "loneliness is an invention of the white man, when we are alone we talk to everything around us, we are never alone" (Ojibwa)

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