4 . Hot roller fixing machines , due to the heating roller surface rubber aging off, scratches , or fuser roller cleaning blade defects make local stained dirt, forming stains.

5. Pickup roller by toner contamination on the pickup causing stains.

6. Developer in black powder spilled on paper or leaking drum .

( Eight ) , there are stains on the copy image

Cause and Remedy :

1 . The photosensitive layer of the photosensitive drum scratches.

2 . Drum pollution, such as oil stains , fingerprints , I fall debris .

3 . Curing the toner appears on the developing roller.

4 . Hot roller fixing machines , due to the heating roller surface rubber aging off, scratches , or fuser roller so that the roller cleaning blade defects local stained dirt, forming stains.

5. Pickup roller by toner contamination on the pickup causing stains.

6. Developer in the toner from leaking or spilled on the paper drum .

( Nine ) , white spots appear on the graphic print

Cause and Remedy :

1 . Developing bias is too high. Adjust the developing bias .

2 . Light drum surface layer peeling , bumps . Clean or replace the grinding drum .

3 . Due to the low voltage wire transfer , resulting in low efficiency due to the transfer .

4 . Copy low partial moisture may also appear white .

( Ten ) , a copy of the image surface is not smooth

Cause and Remedy :

1 . Good quality toner particle is too thick.

2 . Excess carrier in the developer overflow to the copy paper.

3 . Developing concentration is too high, lower the amount of powder too .

4 . Fusing temperature is not enough , the toner not completely uniform. Adjust the fusing temperature control circuit overhaul .

( XI) , a copy of the image fixing bad

The fixing is not good quality , is manifested as a lack of fixing the toner image is not strong buildup easily be erased , the toner off. The other is a fixing excessively coarse complex image lines , the decrease in resolution , the paper yellow , brittle, it to be burned.

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