Contents
Image Faults......................................................................................................... 1
Faint white line on a second side image due to the stain on the Connection Lower Guide Roller
for the Primary Fixing Assembly......................................................................................................1
Uneven gloss (Rain drop mark) in the high-density area in usage of OHT......................................... 2
Horizontal white streaks with 2mm intervals on a high density green image...................................... 5
Uneven gloss on the entire high density image...................................................................................8
Glossy streaks on high density portion..............................................................................................11
10mm wide glossy lines near 40/80/10mm from the center of the first side of duplex printing......... 12
1 mm-wide glossy lines at intervals of 5 mm in the high-density area on the first side of duplex
printing...........................................................................................................................................14
Prevention method for random horizontal lines on a halftone image due to curled ITB from
being unused for a long time......................................................................................................... 17
Ring marks on an image due to the foreign substance contamination in the developing assembly.. 21
Error in reading image position adjustment caused by paper fault................................................... 22
Marks appear on the front side of the back face of one-sided print or of the first face of two-
sided print...................................................................................................................................... 24
Strike mark on the fixing roller due to toner soiling........................................................................... 25
Streaks on image due to an erroneous assemblage of the pressure refresh roller...........................26
Vertical lines due to cross feed roller pressure................................................................................. 27
Non-glossy lines with a width of 7 mm due to the life of fixing belt................................................... 28
White horizontal lines at intervals of 2mm on green high-density image caused by uneven
charge amount of the ITB.............................................................................................................. 29
Uneven density in a grid pattern on a high density image due to the uneven resistance on ITB......31
Soiling of spots at ITB intervals.........................................................................................................33
Soiled image on the 1st side of 2-sided print.................................................................................... 34
Soiled trailing edge/soiled paper edge on both sides of 2-sided print...............................................35
Vertical white line on solid image of each color.................................................................................36
Bk soiling at the front edge on the back side.....................................................................................38
Uneven density on a Bk solid image due to the uneven resistance of ITB....................................... 39
Uneven density on the second side of a black halftone image......................................................... 41
Edge Soiling due to a soiled fixing inlet guide...................................................................................43
Image failure occurring repeatedly at the same interval (xx pitch).................................................... 44
Stains on the back side of paper or uneven density at regular interval (5.0mm) due to the
scraped drive shaft when outputting an image.............................................................................. 46
Soiled edge on the leading edge and the trailing edge of paper caused by rubbing against the
flapper on the delivery reverse unit................................................................................................52
Uneven density on the second face of a halftone image due to uneven distribution of moisture
on paper surface............................................................................................................................53
Gloss lines on image due to the scratches on the surface of fixing roller which the refresh
roller gives in its operation.............................................................................................................55
Countermeasure against uneven density at 10mm intervals............................................................ 56
Marks on image caused by friction due to mini gripper edge (Perfect Binder- B1/D1/E1)................ 58
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