If colleagues experience black block results on the HP LaserJet P1102 printer. try changing the cartridge first. If you replace the cartridge the results are still the same. So what you have to check is the grounding part that is attached to the power supply. Is the grounding wire safe? If there are 2 wires, it means it is safe. then check the power supply to see if there is a lot of toner powder which causes grounding to fail. if the power supply has been cleaned & the results are still the same. then the final step is to replace the transformer whose position is in the middle of the grounding section.
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