HP LaserJet 4345 Multifunction Printer series - Manual (Page 248)

Repetitive defect 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.
1
2
3
4
5
6
1 First occurrence of the defect
2 Print cartridge (37.7 mm [1.5 inches])
3 Transfer roller (part of the maintenance kit) (47 mm [1.9 inches
4 Print cartridge (54.0 mm [2.13 inches])
5 Print cartridge (62.8 mm [2.5 inches])
6 Fuser (part of the maintenance kit) (94.0 mm [3.75 inches])
7 Print cartridge (94.2 mm [3.75 inches])
To identify if the print cartridge is the problem, insert a print cartridge from another
HP LaserJet 4345mfp, if one is available, before ordering a new print cartridge.
If the defect repeats at 94.0 mm (3.75 inch) intervals, try replacing the print cartridge before
replacing the fuser.
234 Chapter 10 Solving problems ENWW