Brother International HL-1070 Service Manual - Page 80

I-16 Black bank Possible cause Drum unit Step 1 Check Is the wire cleaner positioned at its home position? Result Remedy No Return the wire cleaner to its home position. Yes Replace the drum unit. I-17 Gray background Possible cause Density dial Print paper Step 1 2 Check Is the problem corrected by adjusting the density dial? Does the paper being used meet the paper specification (weight, etc.). Drum unit 3 Is the problem solved after replacing the drum unit? Result Remedy Yes Adjust the dial to the most suitable position. No Recommend to change the paper to a specified type of the paper. Yes Recommend to change the paper to a fresh pack paper. Yes Replace the H.V. power supply. Replace the drum unit. Note: The following cases raise the possibility of this problem. 1. The drum unit is at the end of its life. 2. There is dust or paper powder. 3. A large number of paper whose width is narrower than A4 is printed. IV-16