Developer is supposed to be replaced by a technician because all of old developer has to be removed from the machine usually with a vaccum. You have to be very careful how to remove it off of the mag roller so you don't scratch it and you have to leave a finger on it so you don't mess up the polarity of it from the vaccum.
Then there are some service codes that need to be ran to initialize it. This way the toner/developer sensor can be calibrated.
If any step is missed it will effect the copy quality and the developer can be contaminated as well and will have to be replaced.
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