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A complete and very usefull service manual with all details.
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Text excerpt from page 79 (click to view)
Dirt on the back of paper
<Printing> Possible cause Fixing unit Step 1 Check Is the pressure roller dirty? Is any other area in the printer dirty? Dirt in the drum unit 2 Is the transfer roller dirty? Is the problem solved after the drum unit is replaced? No Replace the high-voltage power supply PCB. Yes Result Yes Remedy Clean the pressure roller. (See the following note.) Replace the drum unit
Note: Clean the pressure roller as follows; (1) Set three or more sheets of paper in the MP sheet feeder. (2) Open the top cover. (3) Turn on the power switch while holding down the switch on the printer control panel. (4) Release the panel switch when the Drum lamp is on. (5) Close the top cover. (6) Hold down the panel switch until the Ready lamp is on, then release the switch. (7) Print three patterns; grid, zip and solid black. (8) Turn off the power switch with the top cover closed. (9) Set paper in the manual slot with the solid black side up. (10) Turn on the power switch while holding down the switch on the control panel. (11) Release the panel switch when the Drum lamp is on. (12) Press the panel switch again and release it immediately. (13) Print a page of test pattern while cleaning the pressure roller.