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  1. #1
    Learning 100+ Posts nullskull's Avatar
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    C4521 code on a 3070L

    I got a C-4521 code constantly showing up every time on booting up the machine. I've opened the machine and vacuumed out the toner that spilled on the color registration sensor panel. I also cleaned the sensor on that panel. It seems like the cleaning module for the transfer belt is fine and it already was replaced fairly recently. Is there a couple things I should do in the admin settings in order to get the machine working? Or is there something I might be missing?

  2. #2
    Master Of The Obvious 10,000+ Posts
    C4521 code on a 3070L

    blackcat4866's Avatar
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    Re: C4521 code on a 3070L

    Vacuuming could have damaged those patch sensors. I use a blower brush (not canned air) or a stretch-N-dust to clean that area.
    First run this adjustment, below. If it fails, you probably blew one of those patch sensor with vacuuming. Replace sensors and run adjustments again:

    Clean color registration sensors. Run color registration auto adjustment to re-calibrate the sensors any time it has been removed: Utility > Stop 00 Stop 01 > Machine Adjustment > Printer Adjustment > Color Registration Auto Adj. > Start (perform up to (3) times).

    Ideal values should be -1 < x < +1 =^..^=
    Last edited by blackcat4866; 02-27-2024 at 09:20 PM.
    If you'd like a serious answer to your request:
    1) demonstrate that you've read the manual
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    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. #3
    RTFM!! 5,000+ Posts allan's Avatar
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    Re: C4521 code on a 3070L

    Quote Originally Posted by blackcat4866 View Post
    Vacuuming could have damaged those patch sensors. I use a blower brush (not canned air) or a stretch-N-dust to clean that area.
    First run this adjustment, below. If it fails, you probably blew one of those patch sensor with vacuuming. Replace sensors and run adjustments again:

    Seen that happen due to an unearthed vacuum cleaner. On a C1100 I had to replace the shutter motor driver on the main board also due to guys using an electric blower on that sensor assy.

    That is good advise to use a blower brush. Moving toner to fast can create real bad static.
    Whatever

  4. #4
    Service Manager 5,000+ Posts tsbservice's Avatar
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    Re: C4521 code on a 3070L

    Quote Originally Posted by allan View Post


    That is good advise to use a blower brush. Moving toner to fast can create real bad static.
    Side note on using blower brush. Lately but better late than never I started using blower brush. OEM for like 5 euro. I'm very satisfied and amazed how good this tool is. It's making real wonders on cleaning ADFs and is unbelievable good at cleaning small drum units without disassembly on our Brothers.
    Must have tool definitely.

    0016924_genuine-konica-minolta-blower-brush.jpg
    A tree is known by its fruit, a man by his deeds. A good deed is never lost, he who sows courtesy, reaps friendship, and he who plants kindness gathers love.

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    I don't reply to private messages from end users.

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