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  1. #21
    Service Manager 2,500+ Posts tsbservice's Avatar
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    Re: What happens to the developer?

    Quote Originally Posted by allan View Post
    Can't help it i have to spill.

    Developer does get #u&ed in more than one way. The sharp corners for the grains gets warn down and your nice and puffy mag brush is not the same anymore and these rounded grains have a way of breaking free from the magnetic field. Toner gets impacted onto the grains also making it less attracted to the magnetic field, it gets heavier and the extra weight is not magnetic. With the impacted toner machines using toner to carrier ratio sensors will count the toner stuck to the developer as part of the toner concentration and will read a higher TCR value leading to less toner supplied and resulting in light prints. Eventually a lot of the developer would have escaped from the tank and some machines have a minimum value of toner it will add counted by hopper rotations. If there is still enough developer in the tank to cover the mag roller the set amount of toner added will be too much overshooting the TCR target leading to over-toning. Then there is paper dust, its got a way of getting into the dev tank and then just accumulates in there. The paper dust is added to the toner side of the ratio and leads to the machine not adding enough toner.

    You can setup a bench tool to read TCR value of a dev toner mix if you really want to.
    Its amazing to see that most of the developer used by the OEM's are the same stuff regardless if its color or not.
    I'm very glad we have here many actually thinking engineers not only toner jockeys/masters of screwdriver. Sometimes I feel so lone where I am 😅
    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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  2. #22
    Technician
    What happens to the developer?


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    Re: What happens to the developer?

    The % is life remaining not level remaining. Developer isn't consumed it just wears. However if there is arcing, as was common in older machines, it would suck the developer out into the machine and create usually worse arcing and eventually error code for TLD, ATDC, L-Detect(Toner Level). I actually used to save some developer to repair a machine in a pinch. Fix the arcing issue first of course, Then add a little of the used developer at a time until the error went away or L-detect was successful, then hope it would hold up until I could return with a new developer. But with current models I wouldnt save developer. However I have saved the waste toner on monochrome machines. Ive actually poured the waste toner back into the toner bottle on a couple occasions. Way back in the day, when Konica originally had waste toner bottles and the toner bottle poured into the hopper, our service manager had us dumping waste toner into the toner hopper on every service call. Which from the model 7033 2000-ish, until the 4 series most if not all the monochrome Konica actually did this anyway.

  3. #23
    RTFM!! 2,500+ Posts allan's Avatar
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    Re: What happens to the developer?

    Quote Originally Posted by apostlegato View Post
    I have saved the waste toner on monochrome machines. Ive actually poured the waste toner back into the toner bottle on a couple occasions.I have saved the waste toner on monochrome machines. Ive actually poured the waste toner back into the toner bottle on a couple occasions.

    What a waste... Yea been doing it. Pity the waste from 754 will not be good for a 423.
    Had to do it for my 951 machines due to shortages and no ill effect. Sure its not the best to keep your developer crisp.
    Whatever

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