6. Toner carrier moisture resistivity decreased chargeability of the toner and the carrier deteriorates , the developing adverse effect . Replacing the toner or carrier.

7 . Fatigue carrier (including wet and dry developing developing ) the carrier to the toner ( or ink ) adsorption capacity decreased , the toner tends to free , and the residue was adsorbed potential ( bright area ) , the bottom ash produced .

8. The toner and the carrier does not match , the effect is not the same model .

9. Drum fatigue. Clean or replace the drum .

10. The power supply is too low then the machine should ensure that the voltage is not less than 220 volts.

( Five ) , copy after copy color light , contrast is not enough

Cause and Remedy :

1 . The surface of the photosensitive drum charge potential is too low , resulting in the post-exposure surface potential difference is too small , the electrostatic latent image of a small contrast . Adjustment or adjustment of distance between the electrode charging potential of the photosensitive drum and the charging wire .

2 . Humidity copier job is too large, the sheet caused by excessive moisture .

3 . Because of the physical and chemical indicators of copy paper does not meet the requirements, such as caused by paper thickness , smoothness and density and other factors .

4 . Mechanical and electrical aspects of the reasons are: the transfer charger wire is dirty , stained with toner , dust , paper, affect the transfer voltage ; wire transfer from the drum surface ( paper ) far , the transfer current is too small to make back of the paper with sufficient transfer of charge , the impact of the transfer effect. Clean the transfer charger wire or wire transfer to adjust the distance of the photosensitive drum .

5. Developer in the toner is not enough to fully developed enough to cause development contrast .

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