Originally Posted by
blackcat4866
Sometimes the "Add Toner" indication is a symptom, not a cause. For example, what if the yellow was massively over-toning and is sucking the cartridge dry? The developing unit may be so full of toner that it poofing out of every seam in the developing unit. Have a peek in the waste bottle: is it very full of yellow toner?
On Toshibas it's common to have a rear primary charge insulator break. When there's no yellow charge the machine entirely coats the primary transfer belt with yellow toner, depleting the developer in about 10 seconds. The customer calls for "Add Toner Yellow". The toner add system just can't add toner as fast as it's pouring out of the developing unit. =^..^=
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