Xerox 7750DXF - Phaser Color Laser Printer Service Manual page 163

The Imaging Units
Potential Defects (usually single color):
Spots
Deletions
Bands
Repeating defects - 44 mm (1.7 in.) or 94 mm (3.7 in.)
The Developer Housings
Potential Defects (usually single color):
Bead Carryout (grit on copy)
Spots
Deletions
Mottle
Uneven density front to rear
Repeating defects - 28.3 mm (1.1 in.)
The Accumulator Belt Assembly
Potential Defects (usually all colors):
Spots
Deletions
Banding
Uneven density front to rear
Offsetting/Ghost Images (cleaner malfunction)
Repeating defects - every 4th 8 1/2 x 11 or every other 11 x 17
The Fuser
Potential Defects (all colors):
Streaks
Spots
Bands
Offsetting
Repeating defects - 84 mm (3.3 in.) or 94 mm (3.7 in.)
Transfer Roller - 88mm
Print-Quality Troubleshooting 5-3