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print out becomes dark ?

any time i print out the paper becomes dark and when i check the drum the yellow toner is around it.
please can you help me to resolve the problem
wonder, October 2015
If its a colour copier/printer the yellow drum may need changing but the software would have a test/calibration to confirm or maybe a charging unit needs replacing/recharging. Really depends what the unit is?

Olwen669, October 2015
You could start by telling us what the equipment is, plus the make and model

X, October 2015