Image Quality
3-20 09/06 PHASER 3124 / PHASER 3125
IQ 18 Periodic Defective Image
If a mark or other printing defect occurs at regular intervals on the page it may be caused by a
damaged or contaminated roller. Measure the repetition interval and refer to the table below to
identify the roller concerned.
Table 1: Periodic Defective Image
No Roller Defective Image Typical Defect
1 OPC Drum 75.5mm (2.97 inches) White spots on a black image or vice versa
2 Charge Roller 37.7mm (1.48 inches) Black spots
3 Supply Roller 47.5mm (1.87 inches) Light or dark horizontal image bands
4 Developing Roller 35.2mm (1.39 inches) Horizontal image bands
5 Transfer Roller 46.2mm (1.82 inches) Ghost image
6 Heat Roller 77.7mm (3.06 inches) Black spots or ghost image
7 Pressure Roller 75.4mm (2.97 inches) Black spots on the back page
8 Feed Roller 57mm (2.24 inches) Black spots
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