Contents
Chapter 14 Correcting Faulty Images
14.1 Making Initial Checks................................................................................................................................................14-1
14.1.1 Installation Environment.......................................................................................................................................................... 14-1
14.1.2 Checking of Paper.................................................................................................................................................................... 14-1
14.1.3 Checking of Paper Setting ....................................................................................................................................................... 14-1
14.1.4 Checking of the Durable Parts ................................................................................................................................................. 14-1
14.1.5 Checking of the Periodically Replaced Parts........................................................................................................................... 14-1
14.1.6 Checking of Each Unit/Checking Item of Each Function System........................................................................................... 14-1
14.1.7 Others....................................................................................................................................................................................... 14-2
14.2 Test Print ....................................................................................................................................................................14-2
14.2.1 Overview.................................................................................................................................................................................. 14-2
14.2.2 Test Print TYPE....................................................................................................................................................................... 14-2
14.2.3 Selecting the Test Print TYPE ................................................................................................................................................. 14-3
14.2.4 16-Gradation (TYPE=4) .......................................................................................................................................................... 14-3
14.2.5 Full Area Half Tone (TYPE=5) ............................................................................................................................................... 14-3
14.2.6 Grid (TYPE=6) ........................................................................................................................................................................ 14-4
14.2.7 MCYBk Horizontal Line (TYPE=10) ..................................................................................................................................... 14-4
14.2.8 64-Gradation (TYPE=12) ........................................................................................................................................................ 14-5
14.2.9 Full Color 16-gradation (TYPE=14)........................................................................................................................................ 14-5
14.3 Troubleshooting .........................................................................................................................................................14-6
14.3.1 Image Faults............................................................................................................................................................................. 14-6
14.3.1.1 Light Image / Weak Density .......................................................................................................................................................................14-6
14.3.1.1.1 When printing on CLC extra heavy paper (209g), light image occurs at solid black areas of output image .....................................14-6
14.3.1.1.2 Uneven density/light image: Developing high-voltage cable has poor contact ..................................................................................14-6
14.3.1.2 Uneven Density...........................................................................................................................................................................................14-7
14.3.1.2.1 When copying thin gray lines in Text/Printed Img. mode, moire-like image appears .......................................................................14-7
14.3.1.2.2 Uneven density (uneven gross) occurs when copying/printing high-density image with thick coated paper in use..........................14-7
14.3.1.2.3 Uneven density appears at 4mm intervals in main scanning direction ...............................................................................................14-7
14.3.1.3 Image Displacement/Out of Focus..............................................................................................................................................................14-8
14.3.1.3.1 Smeared image/hue variation (variation of drum potential) occurs in humidity environment ...........................................................14-8
14.3.1.3.2 Yellow displaced at trail edge of image upon installation: Screw on ITB connecting shaft is loosened ...........................................14-8
14.3.1.3.3 When duplex printing, position of image on both 1st and 2nd sides is displaced in sub scanning direction .....................................14-9
14.3.1.4 Partially Blank/Streaked..............................................................................................................................................................................14-9
14.3.1.4.1 Void occurs in main scanning direction on halftone area/oval-shaped patterns/E060-0000: J423 connector (11-pin CT connector) on
main body side of pre-conditioning unit has poor contact ..............................................................................................................................14-9
14.3.1.4.2 Void occurs in sub scanning direction upon installation: ATR shutter solenoid cable comes into contact with developing cylinder.14-
10
14.3.1.4.3 Measure against scratches made on Fixing Roller in circumferential direction: Lines appear in sub scanning direction ...............14-11
14.3.1.4.4 Lines (smeared image): Mylar comes off post duct in P-kit assembly .............................................................................................14-12
14.3.1.4.5 In low temperature environment, void occurs at border between halftone area and solid image area .............................................14-13
14.3.1.4.6 Fingerprint.........................................................................................................................................................................................14-13
14.3.1.5 Smudged/Streaked.....................................................................................................................................................................................14-14
14.3.1.5.1 Yellow vertical stripes on copy images/blank image on PG test chart printouts: PF-A board is faulty ...........................................14-14
14.3.1.5.2 Soiled back: Transfer roller B3 in Secondary transfer mount assembly is soiled.............................................................................14-14
14.3.1.5.3 Soiled back (patch mark) appears: HV8 PCB is faulty.....................................................................................................................14-14
14.3.1.5.4 Soiled back: A failure in cleaning the secondary transfer roller is caused .......................................................................................14-15
14.3.1.5.5 Dark spots appear on output image ...................................................................................................................................................14-15
14.3.1.5.6 The poor picture by the attachment mistake of seal support plate (front, rear) ................................................................................14-15
14.3.1.6 Ghost / Memory ........................................................................................................................................................................................14-17
14.3.1.6.1 Fixing Gloss Ghost............................................................................................................................................................................14-17
14.3.1.7 Faulty Color Reproduction........................................................................................................................................................................14-18
14.3.1.7.1 At scanner reading upon installation, faulty image occurs: S-B Board PCB has poor contact ........................................................14-18
14.3.1.7.2 Hue variation occurs: OFST value (target value) for PASCAL is changed......................................................................................14-19
14.3.1.7.3 Faulty gradation occurs with machine equipped with DADF-R1 after auto gradation adjustment (full adjustment) ......................14-19
Summary of Contents for imagePRESS C1
Page 1: ...Oct 22 2008 Service Manual imagePRESS C1 Series ...
Page 2: ......
Page 6: ......
Page 38: ...Contents ...
Page 39: ...Chapter 1 Introduction ...
Page 40: ......
Page 42: ......
Page 72: ...Chapter 1 1 30 F 1 18 ...
Page 85: ...Chapter 1 1 43 T 1 26 ...
Page 88: ......
Page 89: ...Chapter 2 Installation ...
Page 90: ......
Page 94: ......
Page 234: ......
Page 235: ...Chapter 3 Basic Operation ...
Page 236: ......
Page 238: ......
Page 244: ......
Page 245: ...Chapter 4 Main Controller ...
Page 246: ......
Page 248: ......
Page 276: ...Chapter 5 Original Exposure System ...
Page 277: ......
Page 332: ...Chapter 6 Laser Exposure ...
Page 333: ......
Page 342: ...Chapter 6 6 8 F 6 10 1 Laser Light 2 Laser Shutter 3 Laser Shutter Lever 1 1 2 2 1 2 3 3 3 3 ...
Page 344: ...Chapter 7 Image Formation ...
Page 345: ......
Page 431: ...Chapter 7 7 82 ...
Page 462: ...Chapter 8 Pickup Feeding System ...
Page 463: ......
Page 504: ...Chapter 8 8 39 7 F 8 52 8 F 8 53 9 F 8 54 1 3 2 1 2 4 3 1 2 4 3 ...
Page 505: ...Chapter 8 8 40 10 F 8 55 11 F 8 56 12 F 8 57 1 4 2 3 5 4 1 3 2 1 4 2 5 3 ...
Page 506: ...Chapter 8 8 41 13 F 8 58 14 F 8 59 15 F 8 60 5 1 2 3 4 1 2 3 5 4 1 2 3 4 5 ...
Page 507: ...Chapter 8 8 42 16 F 8 61 1 2 3 4 5 ...
Page 509: ...Chapter 8 8 44 3 F 8 64 A Duplexing reversal position 4 F 8 65 2 1 A 2 1 ...
Page 510: ...Chapter 8 8 45 5 F 8 66 6 F 8 67 2 1 2 1 ...
Page 511: ...Chapter 8 8 46 7 F 8 68 8 F 8 69 3 2 1 3 2 1 ...
Page 512: ...Chapter 8 8 47 9 F 8 70 10 F 8 71 3 2 1 2 3 1 ...
Page 513: ...Chapter 8 8 48 11 F 8 72 B Duplexing re pickup stop position 12 F 8 73 3 2 B 1 3 1 2 ...
Page 514: ...Chapter 8 8 49 13 F 8 74 14 F 8 75 1 2 3 1 2 3 ...
Page 516: ...Chapter 8 8 51 F 8 77 SL3 M10 PS17 ...
Page 533: ...Chapter 8 8 68 F 8 154 1 2 4 3 2 3 4 ...
Page 534: ...Chapter 9 Fixing System ...
Page 599: ...Chapter 10 Externals and Controls ...
Page 642: ...Chapter 11 MEAP ...
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Page 695: ...Chapter 12 Maintenance and Inspection ...
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Page 700: ...Chapter 12 12 2 F 12 1 28 9 10 14 13 29 29 11 12 27 6 3 1 2 5 4 7 8 15 16 ...
Page 701: ...Chapter 12 12 3 F 12 2 17 20 24 23 25 26 19 18 24 21 22 ...
Page 704: ...Chapter 12 12 6 F 12 3 1 2 3 4 9 6 5 7 8 11 12 13 14 15 10 ...
Page 715: ...Chapter 12 12 17 F 12 18 1 1 2 2 ...
Page 716: ...Chapter 13 Standards and Adjustments ...
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Page 732: ...Chapter 14 Correcting Faulty Images ...
Page 862: ...Chapter 15 Self Diagnosis ...
Page 894: ...Chapter 16 Service Mode ...
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Page 1222: ...Chapter 17 Upgrading ...
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Page 1256: ...Chapter 17 17 31 F 17 65 2 Turn off the main power switch and remove the USB device ...
Page 1257: ...Chapter 18 Service Tools ...
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Page 1264: ...Oct 22 2008 ...
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