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Table of contents
To correct trouble
1. Image quality
1.1 Spot
1.1.1 Cyclic white spot/black spot ----------------------------------------------------------------------------------- 4
1.1.2 Color Spots due to soilage inside machine ---------------------------------------------------------------- 5
1.1.3 Color Spots (black spots) -------------------------------------------------------------------------------------- 9
1.1.4 White Spot due to the developing leakage (foreign material) ---------------------------------------- 11
1.1.5 White dots from 2nd transfer unit -------------------------------------------------------------------------- 12
1.2 Line/Band
1.2.1 Line and uneven density countermeasure flow
--------------------------------------------------------- 13
1.2.2 White lines (to sub-scan direction) ------------------------------------------------------------------------ 16
1.2.3 Gloss line caused by fusing paper exit roller ------------------------------------------------------------ 18
1.2.4 Banding in the main scan direction on halftone image printed on thick paper
(Jitter problem) --------------------------------------------------------------------------------------------------------- 19
1.2.5 Line like ripple on image ------------------------------------------------------------------------------------- 22
1.2.6 Waste toner packin ------------------------------------------------------------------------------------------ 23
1.2.7 Darker image up to 44mm from leading edge or after 53mm from white area
(Developing memory) ----------------------------------------------------------------------------------------------- 24
1.2.8 Lines or banding to the main scan direction (CD) due to speed difference
between 2nd transfer and fusing ------------------------------------------------------------------------------- 25
1.2.9 Image got blurred affected by ozone (cyclic white band) ------------------------------------------- 27
1.2.10 Photoconductor (Drum) memory ------------------------------------------------------------------------ 28
1.2.11 Developing screw mark ---------------------------------------------------------------------------------- 30
1.2.12 Lines or banding on image due to speed change (shock noise) -------------------------------- 33
1.2.13 Developing roller (44mm) cycle banding (different density) -------------------------------------- 42
1.2.14 Irregular darker or lighter density band appears after leaving machine under high humidity
environment ------------------------------------------------------------------------------------------------------------ 43
1.2.15 Jittering lines at trailing edge ---------------------------------------------------------------------------- 44
1.2.16 8mm interval FD lines ------------------------------------------------------------------------------------- 45
1.2.17 Density change by static electricity --------------------------------------------------------------------- 46
1.2.18 FD Lines and Banding ------------------------------------------------------------------------------------- 48
1.2.19 5mm cycle density difference caused by the fusing unit ------------------------------------------ 51
1.2.20 Color lines in CD at 13mm from the leading edge -------------------------------------------------- 52
1.2.21 White line due to separation claw mark --------------------------------------------------------------- 54
1.2.22 Gloss band in CD with margin width ------------------------------------------------------------------- 55
1.2.23 Image lacks at the corner of the trailing edge (Soilage in main scan direction (CD) ------- 57
1.3
Others
1.3.1 Image after white part becomes darker (Developing ghost)
--------------------------------------- 58
1.3.2 Darker at the trailing edge of image ----------------------------------------------------------------------- 60
1.3.3 Background or toner scattering after continuous low coverage ------------------------------------ 61
1.3.4 How to maintain consistent color during continuous printing ---------------------------------------- 62
1.3.5 Unexpected density drop if "Dens. Adj. Per Paper" set positive (+) value -------------------- 64
1.3.6 Small blank area or color registration error ------------------------------------------------------------ 66
1.3.7 Too high gloss ------------------------------------------------------------------------------------------------- 68
1.3.8 Rough image on the 1st side of duplex ----------------------------------------------------------------- 70
1.3.9 White or color banding at thick paper leading and trailing edges --------------------------------- 71
1.3.10 C-2451, C-2452, C-2453 or C-2454, Low toner density ------------------------------------------ 73
1.3.11 Poor transfer at image front ------------------------------------------------------------------------------ 74
1.3.12 Prevention of the backside soilage --------------------------------------------------------------------- 76
1.3.13 Fainted outline, darker at edge -------------------------------------------------------------------------- 77
1.3.14 Image bacground under high temperature ----------------------------------------------------------- 78
1.3.15 Backside image soilage ----------------------------------------------------------------------------------- 79
1.3.16 Toner is not cleaned at the edge of the transfer belt ----------------------------------------------- 81
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