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  1. #11
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    Re: ES 7516AC error C471

    C471 has been a nightmare lately. Mostly the 85/75ppm machines. We have lowered the fuser temps with little success. Happens most often after a fuser rebuild. We have installed the new thermostat holders/covers, firmware etc. Thermostats have been on backorder for 4 weeks

  2. #12
    Master Of The Obvious 10,000+ Posts
    ES 7516AC error C471

    blackcat4866's Avatar
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    Re: ES 7516AC error C471

    I don't know if it will fix anything, but I tried the two-pronged approach:

    1) New holder.
    2) I tested the fuser unit exhaust fan in 03-462, 461. Tests OK in low and high speed.
    3) I lowered the temperature at which the fans start/stop running: 08-2386 4>2 (to provide additional cooling).
    4) I lowered the fuser temperature at the center thermistor by 5 degrees: Normal 08-2010-0 14>13, Low 08-2010-2 14>13, Decelerating 08-2010-10 12>11

    We'll see if there's any improvement. =^..^=
    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 =^..^=

  3. #13
    Senior Tech 250+ Posts barber782's Avatar
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    Re: ES 7516AC error C471

    Has anyone noticed the excess amount of white grease on and around the fuser gears? Iv been to 4 machines so far and found that the gears are starting to bind because of the amount of grease used.

    Sent from my VTR-L09 using Tapatalk

  4. #14
    Service Manager 5,000+ Posts
    ES 7516AC error C471

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    Re: ES 7516AC error C471

    TSB-1903 Change of Thermostat Holder and Cover; Countermeasure to C471 and C472 Errors

    Version 8Created by Jeff Boss on Aug 17, 2018 2:54 PM. Last modified by Jeff Boss on Mar 19, 2019 2:54 PM.
    Copier Bulletin: TSB-1903 Rev. 01
    Date: 03/19/2019

    Models: e-STUDIO7506AC Series and e-STUDIO8508A Series

    Subject: Change of Thermostat Holder and Cover; Countermeasure to C471 and C472 Errors

    Overview
    The Thermostat Holder and Cover have been changed to prevent C471 and C472 errors from occurring.

    Table of Contents




    Description of Symptom

    A C471 error “IH board initialization abnormality” or C472 error “Power Supply abnormality” occur due to abnormal operation of the Thermostat.

    Cause of Symptom

    In some cases, the following two causes could result in a C471 error or C472 error to occur:

    Cause 1: The Thermostat Cover (P-I: 42-54) may be caught by the hook of the Holder
    (P-I: 42-51) and cause the Thermostat to break.

    Cause 2: The lead wire of the Thermostat could get caught on the ribs of the Holder and cause the Thermostat to not function properly. (Refer to TSB-1902)


    Description of Countermeasures

    Countermeasure 1: To avoid the Thermostat Cover being caught by the hook of the Thermostat Holder, the shape of the Thermostat Cover has been changed. A mark "S18" has been added to the post-change cover for identification purposes.

    Countermeasure 2: To prevent the lead wire from getting caught on the ribs of the Holder, the ribs have been removed.


    Application to Production

    The countermeasure described above has been applied to machines produced beginning with the following serial numbers:

    e-STUDIO5506AC/6506AC/7506AC: CHFH27788
    e-STUDIO5508A/6508A/7508A/8508A: CIFH28292

  5. #15
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    ES 7516AC error C471


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    Re: ES 7516AC error C471

    Quote Originally Posted by barber782 View Post
    Has anyone noticed the excess amount of white grease on and around the fuser gears? Iv been to 4 machines so far and found that the gears are starting to bind because of the amount of grease used.
    that was the fix for the gears wearing out. Now everything is a mess. Gear grease, belt oil, all over everywhere. I have found if the belt is beyond PM life, then the fuser rollers start binding. Eventually the white gear in the gear box (behind the systems board) will fail and need a fuser kit and gear.

  6. #16
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    Re: ES 7516AC error C471

    Anyone else see ripples in the belt towards the rear side that eventually lead to the sleeve being ripped in half? We also get c472 and even a message to plug in the power cord at the rear of the machine. This error was originally from the older 6560 series with 2 power cords.

  7. #17
    Master Of The Obvious 10,000+ Posts
    ES 7516AC error C471

    blackcat4866's Avatar
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    Re: ES 7516AC error C471

    I've only seen the ripples at over-yield, and I've never seen one tear in half on a Toshiba. On Kyocera, sure, the KM-8000's would be completely shredded. As long as the screws are tight on the teflon sheet and that teflon sheet doesn't get loose the sleeves seem to last.
    =^..^=
    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 =^..^=

  8. #18
    Senior Tech 250+ Posts barber782's Avatar
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    Re: ES 7516AC error C471

    Another one on the same site has got C471 now. Wtf is going on!?
    Toshiba don't seem to think there's a problem.

    Sent from my VTR-L09 using Tapatalk

  9. #19
    Master Of The Obvious 10,000+ Posts
    ES 7516AC error C471

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    Re: ES 7516AC error C471

    Success with my machine, no re-occurrences. =^..^=
    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 =^..^=

  10. #20
    Field Supervisor 500+ Posts
    ES 7516AC error C471


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    Re: ES 7516AC error C471

    Quote Originally Posted by barber782 View Post
    Hi everyone,

    Installed two Toshiba es7516ac's in a school in December 2019. After a few weeks one is getting the error code C471. Which is to do with the fuser, and turned out to be a blown thermistor.
    Iv replaced the part and reassembled the fuser sleeve components with plenty of oil.
    Now a month later the same error has appeared.
    Does anyone know why this would keep happening? Or anyone experiencing the same on these.

    Sent from my VTR-L09 using Tapatalk

    If you believe Toshiba, which I don't anymore, having dealt with this for almost 3 years, the problem is the belt holder
    unit. 6LK44125000. The part number has changed 3 times, which, could be a manufacturing change, or a problem that
    has been fixed, but NOT mentioned.
    I have tried everything I can think of to resolve these 471 issues. More oil, different types of oil, spacers to ensure better
    connections. I thought it might be a spacing problem between the fuser & the coil, so I disassembled the coil on an 08
    machine that came back after being replaced. It's spring loaded, and when you latch the fuser, spacers on the coil which have
    tension, align the fuser to the coil.
    The tolerance of the fuse for the fuser, is "designed" to work with the 55cpm through the 85cpm machines. The fuse just isn't
    up to the heat for the 85cpm machines. We don't have near the trouble with C471's in the 55, 65, 75 cpm machines in this
    series, just the 85cpm machines.
    It's sad too. This machine is basically a "newer" model of the 5540/5560 machines, with a different fuser. The older model
    machines had fusers that would last forever. They were hard screwed into the machine. These are held with a spring latch.
    I get it that they used a different mechanism to allow for a wider range of paper types, but you know that most people just
    run POP...plain ole paper.
    I don't know what the fix it, but I wish they would do something.

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