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  1. #11
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    Re: Laser printer toner transfer methods

    Quote Originally Posted by tsbservice View Post
    Yes it's transfer belt.

    Besides you're asking some abstract questions neither of us can know answers. We are service engineers not design engineers nor accountants.
    Well, I hoped the "hands-on" experts will have some insight into this topic

    Thank you for replying and sorry for the impractical question.

  2. #12
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    Laser printer toner transfer methods

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    Re: Laser printer toner transfer methods

    The main difference between a direct to paper system and an ITB, Intermediate Transfer Belt, has to so with the paper.
    1. Drums last longer when they are not subjected to contact with the potentially abrasive surface of the paper.
    2. Different types and thicknesses of paper require different transfer currents. With an ITB system only the current of the PTR, Paper Transfer Roller, need to be adjusted.
    3. ProCon, Process Control, to maintain print quality is easier with an ITB. Individual color patches are applied to the ITB and read by the Image Density sensor. This allows the toner concentration in each development unit to be adjusted for optimal quality. One of the patches is printed diagonally to allow for adjusting line position of each color.


    As for the systems using a belt to carry the paper past the drums, many suffer a jitter problem as the trail edge of the paper leaves the registration roller.

  3. #13
    Senior Tech 250+ Posts Drivee's Avatar
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    Re: Laser printer toner transfer methods

    I understand that you wish to learn something. That is ok.
    Brother move to that type of print as using transfer belt will be more precise and print quality will be better, expecialy if we know that Brother have really bad print comaparing to HP/Canon. So they just follow trends.
    btw, Brother dont have waste toner, all excess toner will be returned back to toner tank. That is reason why charge on corona wire will be increaed from 0% to 100% yield. New cartridge will reset charge to default.

  4. #14
    Junior Member Gabrielk's Avatar
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    Re: Laser printer toner transfer methods

    Quote Originally Posted by yoeljacobsen View Post
    I have a question regarding the theory of color laser printer operation.

    Going through the service manuals of a few machines, I noticed two patterns (if I read correctly):

    1. The toner is transferred directly from the drums to the paper (for instance - Brother MFC-L series).
    2. The toner is transferred to the belt and from the belt to the paper (for instance - Kyocera M6035, Lexmark cs720de)

    What are the pros and cons of each method? does it affect the print quality and amount of toner waste?
    This is the practical advice. Brother toner is a pain, Dell has worked much better for me in the past, too. Cleaning the board with a sponge isn't going to help much Abrasives like the ones suggested are the best. I've had great success using the use of a short and mild vinegar bath and. This can polish the copper.
    The quality of the toner is much more important than the quality of paper in my experience. drinking water has assisted greatly. It is important to scrub across the board since there can be clear deposits that slow the process of etching in a significant way (especially in the areas of drilling holes.
    The brand of the laminator is GBC and the motor is altered (gearing shift) so as to bring the speed down considerably. this site is a good source to find out more about this.

  5. #15
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    Laser printer toner transfer methods

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    Re: Laser printer toner transfer methods

    Quote Originally Posted by yoeljacobsen View Post
    So is it really a transfer belt?

    What did Brother gain from this method? After all, it forced such a convoluted paper path vs. using the belt for primary/secondary transfer?
    A little late in getting into the discussion. There actually at least two kinds of transfer belts. There is the transfer transport belt like the one you posted an image of on post #4 and then there are Intermediate Transfer Belts as used in most modern color machines. ITB systems mix the toner on the belt and then transfer it to the paper. They are much more capable of maintaining proper image registration between colors , both in the direction of motion and the direction of laser scan. Get a hold of some of the service manuals for older Ricoh models. They used to have a very good section on the description of how thing worked.

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