HP laserjet m1212nf - Manual (Page 238)

Repetitive defects ruler
If defects repeat at regular intervals on the page, use this ruler to identify the cause of the defect. Place
the top of the ruler at the first defect. The marking that is beside the next occurrence of the defect
indicates which component needs to be replaced.
If the defect correlates with the print engine or the fuser, the product might require service. Contact
HP Customer Care.
Figure 12-1 Repetitive defects ruler
0 mm
27 mm
29 mm
39 mm
56 mm
75 mm
Distance between defects Product components that cause the defect
27 mm Print engine
29 mm Print engine
39 mm Print engine
56 mm Fuser
75 mm Print cartridge
224 Chapter 12 Solve problems ENWW