Ricoh Pro C7500 Original Instructions Manual
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Ricoh Pro C7500 Original Instructions Manual

Ricoh Pro C7500 Original Instructions Manual

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Shared Maintenance Offering:
Advanced Settings for Custom Paper
Original Instructions
For safe and correct use, be sure to read Safety Information
separately provided before using the machine.

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Summary of Contents for Ricoh Pro C7500

  • Page 1 Shared Maintenance Offering: Advanced Settings for Custom Paper Original Instructions For safe and correct use, be sure to read Safety Information separately provided before using the machine.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS 1. Introduction Basic Procedure..............................3 Advanced Settings..............................4 2. Mechanism Electrophotographic process - Overview......................5 Electrophotographic Process-Laser Exposure....................7 Laser Unit (Exposure)............................. 7 Electrophotographic Process – Development....................8 Development..............................8 Electrophotographic Process – Photoconductor Unit-to-Belt Transfer............10 Photoconductor Unit-to-Belt Transfer......................10 Electrophotographic Process –...
  • Page 4 Maximum Image Density..........................34 Image Transfer Output..........................34 Paper Transfer.............................. 35 Fusing................................37 Paper Feed/Delivery from Mainframe Trays....................45 2-Tray LCIT..............................45 Main/Bypass............................... 51 Decurler Unit..............................51 Mainframe..............................52 Interposer..............................56 Finisher: Output............................57...

  • Page 5: Introduction

    1. Introduction This chapter provides an overview of the Media Library. Basic Procedure This machine is capable of printing on a wide variety of media using the latest technologies in digital printing such as the AC transfer and elastic fusing belt. Also, the introduction of the Clear/White toner makes it possible to print copies with added values.

  • Page 6: Advanced Settings

    1. Introduction Advanced Settings Printing from the Media Library is possible with a simple procedure, however, precise adjustments (such as the transfer and fusing conditions) may be required depending upon the media attributes, which differ by each and every media. Such precise adjustments can be made from [Media] hub [Detailed settings].

  • Page 7: Mechanism

    2. Mechanism This chapter provides explanation on the basic electrophotographic process of the engine by referring to the items of the Detailed settings. Electrophotographic process - Overview M0EBIC1101 1. Laser unit 2. Laser beam 3. Charger roller 4. Photoconductor unit 5.
  • Page 8 2. Mechanism • Image transfer Photoconductor unit-to-belt transfer …… Toner images created on each photoconductor unit [4] are transferred sequentially to the ITB [6]. Belt-to-paper transfer …… Toner image on the ITB [6] is transferred onto the paper when the paper passes through the PTR [8].

  • Page 9: Electrophotographic Process-Laser Exposure

    Electrophotographic Process-Laser Exposure Electrophotographic Process-Laser Exposure Laser Unit (Exposure) The laser unit is equipped with the Vertical Cavity Surface Emitting Laser (VCSEL) technology. 40 laser beams are emitted to produce 2400dpi×4800dpi. Laser beams are reflected on the polygon mirror and lenses to create a latent image on each of the photoconductor units by imparting static electricity on the surface of the photoconductor unit.

  • Page 10: Electrophotographic Process - Development

    2. Mechanism Electrophotographic Process – Development Development The development system employs the dual-component development method. The developer is pre-mixed to prevent image quality degradation caused by deterioration of the developer that occurs over time. Electrostatic latent image areas of the photoconductor unit attract negatively charged toner particles from the development roller [1].
  • Page 11 Electrophotographic Process – Development The developer consists of positively charged carrier (+) and negatively charged toner (-). The carrier is pre-mixed with the toner in the toner bottle and the mixture is supplied to the development unit to constantly refresh old developer in the development unit with new developer. Related Advanced Settings page 34 "Maximum Image Density"...

  • Page 12: Electrophotographic Process - Photoconductor Unit-To-Belt Transfer

    2. Mechanism Electrophotographic Process – Photoconductor Unit-to-Belt Transfer Photoconductor Unit-to-Belt Transfer To enable printing in all five toner colors as well as printing using only special color, the mechanism to contact/separate the ITB and ITB rollers was modified in the photoconductor unit-to-belt transfer process for the machine.

  • Page 13: Electrophotographic Process - Belt-To-Paper Transfer

    Electrophotographic Process – Belt-to-Paper Transfer Electrophotographic Process – Belt-to-Paper Transfer Belt-to-Paper Transfer Applied voltage The AC transfer technology is used for the belt-to-paper transfer, to support printing on textured media. Negatively charged toner image (-) on the intermediary transfer belt [4] is transferred to the paper by applying a bias voltage [2] to the paper transfer bias roller [1].
  • Page 14 2. Mechanism By nature of AC, in which the current flows in an alternating up-and-down movement, toner particles sync with this movement. Toner transferred to the media is pulled back to the ITB to gain further transferability, enabling toner particles to fall into the indentations on the rough surfaced media. Textured paper mode DZH009 1.

  • Page 15: Paper Transfer Belt Rotation Speed

    Electrophotographic Process – Belt-to-Paper Transfer page 36 "Paper Transfer Output: Textured Paper Mode" Leading/Trailing edge correction To prevent image quality problems caused by the unstable condition of the paper when it enters the nip of the PTR, the belt-to-paper transfer bias is adjusted for the leading/trailing edges. The following are the three bias correction settings that adjust the bias level and duration.

  • Page 16: Pressure Control System

    2. Mechanism 3. Paper transfer belt Since the paper is simultaneously gripped by the paper transfer roller [1] and the paper transfer timing roller, uneven density and banding problems may occur, if the speed differs between these rollers. paper transfer belt rotation speed (and paper transfer timing roller speed) is made adjustable for this reason.
  • Page 17 Electrophotographic Process – Belt-to-Paper Transfer 1. Paper transfer pressure motor 2. Pressure cam 3. Pressure arm Related Advanced Settings page 36 "Paper Transfer Pressure Mode" page 36 "Paper Transfer Pressure"...

  • Page 18: Electrophotographic Process - Fusing

    2. Mechanism Electrophotographic Process - Fusing Fusing Unit The fusing belt has a thick elastic layer, as with the previous model, to allow the belt to reach farther into the surface indentations of textured media. Conventional fusing belt Base layer Elastic layer Surface layer Textured paper...

  • Page 19: Fusing Nip Width Adjustment

    Electrophotographic Process - Fusing The fusing temperature is momentarily increased one notch immediately before the paper passes through the nip, to compensate for the slight temperature drop of the fusing belt [1] due to the heat absorption by the paper. In addition, the target fusing temperature is momentarily increased another notch immediately before the pressure roller [4] contacts the fusing belt, to compensate for the slight temperature drop due to the contact.

  • Page 20: Fusing Cleaning Unit

    2. Mechanism Fusing Cleaning Unit The cleaning web [2] is pressed against the pressure roller [1], to rub off toner and paper dust adhered to the fusing belt. The web is soaked with silicone oil, which is supplied to the pressure roller and the fusing belt in very small amounts.
  • Page 21 Electrophotographic Process - Fusing Scratched fusing belt caused by paper edge Fusing belt surface condition Paper edge Scratches Scratches are polished by the belt smoothing operation Fusing belt DZH214 Image quality issues such as gloss streaks and uneven gloss can be resolved by polishing the surface of the fusing belt with the fusing belt smoothing roller [1].

  • Page 22: Paper Delivery

    Skew correction & main scan registration A Ricoh original technology is applied to separately control skew correction and main scan registration, to achieve high accuracy in front-to-back registration. The leading edge of the paper fed by the registration timing roller [4] strikes the rotary gate [3]. This buckles the paper slightly and aligns its leading edge with the gate and corrects any skew.
  • Page 23 Paper Delivery Leading edge detection mechanism in more detail This detects the paper edge position (in the direction perpendicular to the paper feed direction) by scanning the paper path using the contact image sensor (CIS), capturing it as an image when the paper passes the registration roller and detecting the border between the background and paper in the image.
  • Page 24 2. Mechanism Rotation speed of the transfer timing roller [2] is adjusted according to the timing the leading edge is detected, to deliver the paper for the belt-to-paper transfer process at the perfect timing. If the leading edge is detected at a timing that exceeds the adjustment range (+/-4.0mm), the system alerts J080 and stops.

  • Page 25: Decurl Unit

    Paper Delivery M0EBIC1115 Related Advanced Settings page 54 "Transfer Timing Roller" / page 55 "Transfer-Fusing Transfer Belt/Fusing Belt: Paper Length" / page 55 "Cooling Roller After Fusing/Detection Roller/Paper Output Roller/ Switchback: Entrance Roller/Switchback: Exit Roller" / page 51 "Correct Paper Curl" Decurl Unit De-curling mechanism Paper curls can be corrected by installing the optional decurl unit.

  • Page 26: Bypass

    2. Mechanism The speed in which the paper passes through the decurl unit can be adjusted. If the speed is set too fast, toner may adhere to the edge of the paper, and if set too slow, wrinkles/creases may occur. Set to an optimum speed according to the stock.

  • Page 27: 2-Tray Lcit

    Paper Delivery Related Advanced Settings page 51 "Main/Bypass" 2-Tray LCIT The LCIT employs the air-assist pickup, similarly to the paper feed units of offset printers. In addition to paper riffling by the air-assist from both sides of the paper, the upper surface of the paper is suctioned by air one sheet at a time, achieving smoother paper delivery of coated paper and art paper, which tend to stick together, reducing double-feeding and paper misfeeds, and achieving excellent paper delivery.
  • Page 28 2. Mechanism M0EBIC1108 1. Updraft fan nozzle 2. Blower fan nozzle 3. Side fan nozzle 4. Side fan 5. Separation fan 6. Updraft fan 7. Return fan 8. Paper upper limit sensor 1 (High) 9. Paper upper limit sensor 2 (Low)

  • Page 29: Interposer

    Paper Delivery M0EBIC1109 1. Feed Belt 2. Vacuum fan 3. Chamber Related Advanced Settings page 45 "2-Tray LCIT" Interposer Air is blown out to fan and separate even the types of paper that are prone to stick together, and to ensure stable feeding of the paper loaded in the paper tray one by one.
  • Page 30 2. Mechanism M0EBIC1117 1. Air duct 2. Blower fan • Air flow M0EBIC1118 Related Advanced Settings page 56 "Interposer"...

  • Page 31: Finisher

    Paper Delivery Finisher Paper ejection jogger mechanism The finisher is equipped with the paper jogger arm to align the edge of paper at the upper part of the paper exit. Just before the paper is delivered to the finisher shift tray, the paper jogger arm lowers and performs the action (opening and closing) to align the edge of paper.
  • Page 32 2. Mechanism M0EBIC1124 A. For paper types that can be aligned smoothly B. For paper types that cannot be aligned smoothly Related Advanced Settings page 57 "Finisher: Output"...

  • Page 33: Details Of Detailed Settings

    3. Details of Detailed Settings This chapter explains the functions of the Detailed settings and the related image quality problems that can be prevented/improved by adjusting these settings. For detailed procedure, see the Troubleshooting manual. Overview Print Mode Image quality is adjusted in balance with productivity according to the print mode (BW/FC/FCS/S), which differ in the maximum toner amount, i.e.

  • Page 34: Registration

    3. Details of Detailed Settings Registration Image Position/Magnification Auto Adjust Image Position 1102 [Auto Adjust Image Position] Function • No. of Check Sheets: Front Side Auto Adjust Image Position: Change the number of sheets for printing the chart used to check the adjustment result when the machine is set to print on one side and for printing charts when printing on one side.
  • Page 35 Registration If [No Detection Mark] is selected, the image position is adjusted according to the shape of the paper. If [Detection Mark] is selected, detection marks are applied on the four corners of the paper and the image position is adjusted according to the shape of the paper and the marks. [No Detection Mark] is less accurate than [Detection Mark].

  • Page 36: Image Quality

    3. Details of Detailed Settings Image Quality Maximum Image Density 1201 [Max Image Density] Function Adjusts the amount of toner developed on the photoconductor unit. When to use To adjust the maximum toner density for the media in use. Note the possible side effects, such as worm track and toner scattering, if set too high. Related Troubleshooting •...

  • Page 37: Paper Transfer

    Image Quality • Shock Jitter For detailed procedure, see the Troubleshooting manual. Paper Transfer Paper Transfer Output 1214 [Paper Transfer Output] Function Adjusts the amount of paper transfer bias applied for transferring the toner image from the intermediate transfer belt to the paper. When to use Problems which are prone to occur in a low temperature and humidity environment, such as white spots, toner blasting and mottling on solid-fills, may be solved by adjusting these settings.
  • Page 38 3. Details of Detailed Settings Paper Transfer Output: Textured Paper Mode 1218 [Paper Transfer Output: Textured Paper Mode] Function To improve toner transferability on textured paper, specify whether or not to enable the textured paper mode and paper transfer AC bias control. When to use If poor transfer occurs when using textured paper or plain paper whose surface is not smooth, the problem may be solved by setting this to [On] and adjusting the bias control.

  • Page 39: Fusing

    Image Quality Paper Transfer Roller Reverse Rotation 1227 [Paper Transfer Roller Reverse Rotation] Function Adjust the intervals between automatic cleaning of the paper transfer cleaning. (If set to "0", this will not be executed.) Set the intervals shorter when using paper that produces much paper dust. * Throughput is reduced if set to a value other than "0".
  • Page 40 3. Details of Detailed Settings • Black Spots • Creases or Worm Tracks • Paper Jam • Glossy Banding • Insufficient Fusibility For detailed procedure, see the Troubleshooting manual. Fusing Temperature 1232 [Fusing Temperature] color [Heat Roller Temp] Function Adjusts the temperature of the fusing belt. When to use Problems such as insufficient fusing, glossy ghosting, uneven streaks, uneven glossiness, and fusing paper jams (J033) may be solved by adjusting this setting.
  • Page 41 Image Quality Correct Temperature 1232 [Fusing Temperature] color [Correct Temperature] Function Adjusts the amount of temperature added to the target before the job starts, to compensate for the heat absorbed by the media. When to use Effective for abnormal image quality problems such as glossy residual image and uneven gloss. Related Troubleshooting •...
  • Page 42 3. Details of Detailed Settings Function Adjust pressure roller temperature. When to use If an uneven luster appears, adjust the fusing pressure temperature. Related Troubleshooting • Uneven Gloss For detailed procedure, see the Troubleshooting manual. Print Mode When Switching Paper Type 1234 [Print Mode When Switching Paper Type] Function Adjust the waiting time when switching the paper in a job with mixed paper.
  • Page 43 Image Quality Fusing Pressure Roller Cooling 1236 [Fusing Pressure Roller Cooling] Function Under the following conditions, set the cooling fan level of pressure roller. When to use Adjust this setting to decrease the pressure roller temperature to solve problems such as uneven glossiness on thick paper.
  • Page 44 3. Details of Detailed Settings Related Troubleshooting • Black Spots For detailed procedure, see the Troubleshooting manual. Margin 1239 [Margin] Function Adjusts the width of the margins at the leading and trailing edges. When to use To adjust the margin width of the leading/trailing edges. Insufficient margin at the leading edge may cause wraparound jams in the fusing unit or affect the images at the leading edge.
  • Page 45 Image Quality Fusing Nip Width: Envelope 1240 [Fusing Nip Width: Paper Type] 02: [Envelope] 1241 [Fusing Nip Width Adjustment] 02: [Envelope] Function Specifies the fusing nip width specifically for envelope printing. When to use Effective for wrinkles, worm track that occur with envelope. Related Troubleshooting •...
  • Page 46 3. Details of Detailed Settings For detailed procedure, see the Troubleshooting manual. Fusing Pressure Roller On Before Fusing 1244 [Fusing Pressure Roller On Before Fusing] Function Turn on or off pressurization when the feed speed of the fusing belt is adjusted before paper is fed. When to use Use this if the fusing nip width is set to "1"...

  • Page 47: Paper Feed/Delivery From Mainframe Trays

    Paper Feed/Delivery from Mainframe Trays Paper Feed/Delivery from Mainframe Trays 2-Tray LCIT Paper Feed Mode 1301 [2-Tray LCIT: Paper Feed Mode] Function Adjusts the behavior of the fan. Setting option Behavior [Prevent Double Feed Amount of air blown from the float fan and side fans is reduced 20% (Weakest Blow)] against the standard value.
  • Page 48 3. Details of Detailed Settings When to use If double-feeds do not improve by setting 1301: [2-Tray LCIT: Paper Feed Mode] to [Prevent Double Feed (Weakest Blow)], decrease the airflow in [Side Fan Level] in steps of 10%. If paper misfeeds persist even after changing the air flow in 1301 [2-Tray LCIT: Paper Feed Mode] to [Prevent Non Feed (Strongest Blow)], try increasing the air flow in steps of 10% along with the value for the side fan level.
  • Page 49 Paper Feed/Delivery from Mainframe Trays Face curl Back curl Sheets float up and tend to result in double- Sheets get pressed down and tend to result in feeds. non-feeds. Side Fan Level 1302 [2-Tray LCIT: Fan/Shutter] [Side Fan Level] Function Adjusts the amount of air blown from the side fans to separate the sheets.
  • Page 50 3. Details of Detailed Settings If double-feeds occur when printing on non-woven-fabric paper or other high-porosity paper, the problem may be solved by decreasing the air flow in steps of 10%. Related Troubleshooting • Paper Misfeeds For detailed procedure, see the Troubleshooting manual. Return Fan Level 1302 [2-Tray LCIT: Fan/Shutter] [Return Fan Level]...
  • Page 51 Paper Feed/Delivery from Mainframe Trays Function As the default, this is set to On. Normally, this is set to On, because setting it to Off may cause streaks on some paper. When to use To reduce paper feed belt streaks on printed copies, set the shutter to ON. Paper Floating Wait Time 1303 [2-Tray LCIT: Other Settings] [Paper Floating Wait Time]...
  • Page 52 3. Details of Detailed Settings When to use Set this to [On] if paper misfeeds frequently occur immediately after the paper is fed. Tray Elevation Assist(Assist Mode) 1303 [2-Tray LCIT: Other Settings] [Tray Elevation Assist] Assist Mode Function Specify the operation to assist raising the bottom plate according to paper thickness. When to use If paper misfeeds frequently occur when the paper almost runs out, set this to [Assist On When Remaining Paper Low].

  • Page 53: Main/Bypass

    Paper Feed/Delivery from Mainframe Trays Function Specify the speed to raise the bottom plate when the assist mode in [Tray Elevation Assist] is set to When to use If paper misfeeds persist even after setting the assist mode to On, set this to [Faster] or [Fastest]. If the specified value is not appropriate, paper misfeeds or double-feeding paper jams may occur.

  • Page 54: Mainframe

    3. Details of Detailed Settings When to use If the line speed of the decurler unit is set too fast, stains could appear on the edge of the sheets, which become noticeable when the prints are stacked. If set too low, creases, wrinkles streaks and stains can appear especially with thin paper.
  • Page 55 Paper Feed/Delivery from Mainframe Trays Function Specify to turn the detection of problems, such as paper skew, ON/OFF. When to use • [Detect/Control JAM047/097/098] Deactivate this setting, if J047/097/098 occurs frequently. However, do so only after confirming that adjusting 1331-06: [Setting] does not resolve the jam. •...
  • Page 56 3. Details of Detailed Settings Increasing the value for the light emission mode helps such paper edge detection, but doing so also helps in detecting paper dust and other foreign particles to cause the cleaning alert to occur more frequently. Related Troubleshooting •...
  • Page 57 Paper Feed/Delivery from Mainframe Trays When to use Image quality problems, for example, banding, spots, etc. which are caused by the difference in the rotation speed against the transfer timing roller. Related Troubleshooting • Uneven Density • Patchy Images • Banding •...

  • Page 58: Interposer

    3. Details of Detailed Settings Function Adjusts the motor rotation speed. When to use Effective for scratches, streaks, wrinkles/creases in sub scan direction (across feed direction). Related Troubleshooting • Image Deformation, Scratches, Streaks, Paper Creases or Bent Corners For detailed procedure, see the Troubleshooting manual. Written Image 1341 [Motor Speed] [Speed Adjustment]...

  • Page 59: Finisher: Output

    Paper Feed/Delivery from Mainframe Trays Function Fan Setting: Set the fan operation of Interposer. Fan Level: Adjust the fan level of Interposer to make paper part easily. When to use Adjust the fan level if misfeeds or double-feeds occur frequently. Related Troubleshooting •...
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