Oki ES3640MFP Service & Troubleshooting Manual page 46

Things to observe when analyzing the ID Check Pattern test page include:
• Streaks in Process Direction (in the direction of feed, parallel with paper
travel)
• Banding in Scan Direction (across the page, perpendicular to paper travel)
• Uneven Density
• Voids
• Repeating Defects
• Mis-registration
Note: Consult the "Repeating Defect Spacing Chart" below.
Repeating Defects Spacing
Component
Imaging Drum
Developer Roller
Charge Roller
Supply Roller
Fuser Belt
Heat Roller
Transfer Unit Belt
Defect Spacing
94 mm (in.)
49 mm (in.)
37.4 mm (in.)
102 mm (in.)
124 mm
87.3 mm (in.)
706 mm
Replace
Imaging Unit
Imaging Unit
Imaging Unit
Imaging Unit
Fuser
Fuser
Transfer Unit