Oki LP-1040 Maintenance Manual page 261

■Technician troubleshooting
Check printing using the engine test pattern 15
If you notice intervals in the occurrence of missing areas, determine the problematic part using the table below showing the part circumferential lengths (intervals), and then clean or replace the part.
Part
Photoconductor drum
Heat roller
Backup roller
Developing sleeve
* The developing sleeve rotates twice as fast as the photoconductor drum, thus its circumferential length is half of 125.6 mm (4.95 inches) or 63 mm (2.48 inches).
Process cartridge
Check whether or not the process cartridge has been replaced in the
process cartridge log (see p. 2-15).
The process cartridge has been replaced
No
Replace the process cartridge
Yes
Not solved
Check the other possible problem locations
7-32
External diameter Circumferential length
60 mm (2.36 inches) 188 mm (7.40 inches)
50 mm (1.97 inches) 157 mm (6.18 inches)
60 mm (2.36 inches) 188 mm (7.40 inches)
40 mm (1.58 inches) 63* mm (2.48 inches)
Fuser unit
The heat roller is damaged or deformed
Yes
OK Replace the fuser unit (see p.9-78)
End of procedure * After replacing the fuser unit, adjust the nip pressure (see p. 10-17) and
calibrate the skew/slack (see p. 10-20)
Not solved
Check the other possible problem locations
No
Clean the heat roller
Not solved
OK
End of procedure
Developer unit
The roller (MAGNET ROLL) surface is damaged
OK
Clean the developer blade (BLADE-S-DV)
Yes
Not solved
Replace the developer unit (see p. 9-35)
OK
Not solved
End of procedure
Check the other possible problem locations
OK
End of procedure