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Ricoh STINGER-C1 Service Manual

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STINGER-C1
(Machine Code: A250)
SERVICE MANUAL
Subject to change
Ricoh Technical Service
May 17th, 1999

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Summary of Contents for Ricoh STINGER-C1

  • Page 1 STINGER-C1 (Machine Code: A250) SERVICE MANUAL Subject to change Ricoh Technical Service May 17th, 1999...
  • Page 2 IMPORTANT SAFETY NOTICES PREVENTION OF PHYSICAL INJURY 1. Before disassembling or assembling parts of the copier and peripherals, make sure that the copier power cord is unplugged. 2. The wall outlet should be near the copier and easily accessible. 3. Note that some components of the copier and the paper tray unit are supplied with electrical voltage even if the main power switch is turned off.
  • Page 3 SAFETY AND ECOLOGICAL NOTES FOR DISPOSAL 1. Do not incinerate AIO cartridge. Toner dust may ignite suddenly when exposed to and open flame. 2. Dispose of used AIO cartridge in accordance with local regulations. (This is non-toxic supplies.) 3. Dispose of replaced parts in accordance with local regulations. 4.

  • Page 4: Table Of Contents

    TABLE OF CONTENTS 1. OVERALL MACHINE INFORMATION ........1-1 1.1 SPECIFICATIONS ..................1-1 1.2 MACHINE CONFIGURATION ..............1-5 1.3 PAPER PATH ................... 1-6 1.4 MECHANICAL COMPONENT LAYOUT........... 1-7 1.5 ELECTRICAL COMPONENT DESCRIPTIONS........1-8 1.5.1 COPIER ENGINE ................1-8 1.6 DRIVE LAYOUT ..................1-11 1.7 COPY PROCESS ...................
  • Page 5 2.6.1 OVERVIEW ................... 2-47 2.6.2 BUILT-IN TRAY ................2-48 2.6.3 BY-PASS TRAY................2-51 2.6.4 PAPER REGISTRATION............... 2-53 2.6.5 MISFEED DETECTION ..............2-54 2.7 IMAGE FUSING..................2-57 2.7.1 OVERVIEW ................... 2-57 2.7.2 FUSING UNIT DRIVE ..............2-58 2.7.3 PRESSURE ROLLER/PAPER EXIT..........2-59 2.7.4 FUSING UNIT DRIVE RELEASE...........
  • Page 6 4. SERVICE TABLES ..............4-1 4.1 GENERAL CAUTION................4-1 4.1.1 AIO CARTRIDGE (ALL-IN-ONE CARTRIDGE) ....... 4-1 4.1.2 TRANSFER ROLLER UNIT ............. 4-1 4.1.3 SCANNER UNIT ................4-1 4.1.4 LASER UNIT..................4-2 4.1.5 FUSING UNIT .................. 4-2 4.1.6 PAPER FEED .................. 4-2 4.1.7 OTHERS ..................
  • Page 7 6.2 SCANNER ....................6-5 6.2.1 EXPOSURE GLASS REMOVAL............6-5 6.2.2 LENS BLOCK REMOVAL ..............6-7 6.2.3 EXPOSURE LAMP REPLACEMENT ..........6-8 6.2.4 1ST SCANNER ALIGNMENT ADJUSTMENT ......... 6-9 6.2.5 2ND SCANNER POSITION ADJUSTMENT ........6-10 6.3 LASER UNIT................... 6-11 6.3.1 CAUTION DECAL LOCATIONS ............ 6-11 6.3.2 LASER UNIT/TONER SHIELD GLASS REMOVAL .......
  • Page 8 7. TROUBLESHOOTING..............7-1 7.1 SERVICE CALL CONDITIONS..............7-1 7.1.1 SUMMARY..................7-1 7.1.2 SC CODE DESCRIPTIONS............. 7-2 7.2 BLOWN FUSE TABLE................7-10 7.3 ELECTRICAL COMPONENT DEFECTS..........7-10 7.3.1 SWITCHES ..................7-10 7.3.2 SENSORS ..................7-11 OPTIONS DOCUMENT FEEDER (A859) 1. OVERALL INFORMATION............A859-1 1.1 SPECIFICATIONS ................
  • Page 9 PAPER TRAY UNIT (A860) 1. OVERALL MACHINE INFORMATION ........A860-1 1.1 SPECIFICATIONS ................A860-1 1.2 MECHANICAL COMPONENT LAYOUT..........A860-2 1.3 ELECTRICAL COMPONENT LAYOUT ..........A860-3 1.4 ELECTRICAL COMPONENT DESCRIPTION ........A860-4 1.5 DRIVE LAYOUT ................. A860-5 2. DETAILED DESCRIPTIONS ..........A860-6 2.1 PAPER FEED AND SEPARATION MECHANISM......A860-6 2.2 PAPER LIFT MECHANISM ..............
  • Page 10 3. REPLACEMENT AND ADJUSTMENT........A861-14 3.1 FEED ROLLER REPLACEMENT ............. A861-14 3.2 TRAY MAIN BOARD REPLACEMENT..........A861-15 3.3 TRAY MOTOR REPLACEMENT ............A861-15 3.4 TRAY MOTOR REPLACEMENT ............A861-16 3.5 LIFT MOTOR REPLACEMENT ............A861-17 3.6 PAPER END SENSOR REPLACEMENT ......... A861-18 3.7 PAPER SIZE SWITCH REPLACEMENT..........

  • Page 11: Overall Machine Information

    17 May, 1999 SPECIFICATIONS 1. OVERALL MACHINE INFORMATION 1.1 SPECIFICATIONS Configuration: Desktop Copy Process: Dry electrostatic transfer system Originals: Sheet/Book Original Size: Maximum A3/11" x 17" Copy Paper Size: Maximum A3/11" x 17" Minimum A5/8 " x 5 " sideways (Paper tray) B6 lengthwise/5 "...
  • Page 12 SPECIFICATIONS 17 May, 1999 Power Consumption: Mainframe Only Full System 120 V 220 ~ 240 V 120 V 220 ~ 240 V Maximum Less than Less than Less than Less than 1.1 kW 1.1 kW 1.2 kW 1.3 kW Copying Approx.
  • Page 13 17 May, 1999 SPECIFICATIONS Copying Speed in Multicopy mode (copies/minute): A4 sideways/ A3/11" x 17" B4/8 " x 14" 11" x 8 " Non-memory copy mode Memory copy mode NOTE: Measurement Conditions 1) Not APS mode 2) A4/LT copying 3) Full size Warm-up Time: Less than 30 seconds (20°C, 68°F): 115 V machine Less than 40 seconds (20°C, 68°F): 230 V machine...
  • Page 14 SPECIFICATIONS 17 May, 1999 · Platen cover Optional Equipment: · Auto document feeder · Paper tray unit (1 tray) · Paper tray unit (2 trays) · 1-bin sorter · Tray heater · Optics anti-condensation heater · Drum heater · Copier feature expander (48 MB memory) Copy Capacity: Copy Tray: 250 sheets (without 1-bin sorter), 125 sheets (with 1-bin sorter)

  • Page 15: Machine Configuration

    17 May, 1999 MACHINE CONFIGURATION 1.2 MACHINE CONFIGURATION A250V501.WMF Version Item Machine Code Copier Copier A250 ADF (Optional) A859 Platen Cover (Optional) A893 Paper Tray Unit - 1 tray (Optional) A861 Paper Tray Unit - 2 trays (Optional) A860 1-bin Sorter (Optional) A869 Memory 48 MB (Optional) A887...

  • Page 16: Paper Path

    PAPER PATH 17 May, 1999 1.3 PAPER PATH A250V000.WMF 1. Optional ADF 2. By-pass feed tray 3. Optional paper tray (1 tray) 4. Paper tray 5. Optional 1-bin sorter...

  • Page 17: Mechanical Component Layout

    17 May, 1999 MECHANICAL COMPONENT LAYOUT 1.4 MECHANICAL COMPONENT LAYOUT A250V561.WMF 1. 1st mirror (scanner) 12. Pressure roller 2. Exposure lamp 13. Transfer roller 3. Polygonal mirror motor 14. By-pass feed roller 4. Original width sensor 15. By-pass table 5. 1st mirror (laser unit) 16.

  • Page 18: Electrical Component Descriptions

    ELECTRICAL COMPONENT DESCRIPTIONS 17 May, 1999 1.5 ELECTRICAL COMPONENT DESCRIPTIONS Refer to the electrical component layout on the reverse side of the point-to-point diagram for the location of the components, using the symbols and index numbers. 1.5.1 COPIER ENGINE Symbol Name Function Index No.
  • Page 19 17 May, 1999 ELECTRICAL COMPONENT DESCRIPTIONS Symbol Name Function Index No. By-pass Tray Paper Informs the CPU that there is paper in the by-pass feed table. By-pass Paper Size Detects the paper size in the by-pass tray. Vertical Transport Detects misfeeds. Registration Detects misfeeds and controls registration clutch off-on timing.
  • Page 20 ELECTRICAL COMPONENT DESCRIPTIONS 17 May, 1999 Symbol Name Function Index No. Others Opens the fusing lamp circuit if the fusing Fusing Thermofuse unit overheats. Fusing Thermistor Detects the temperature of the hot roller. C/B/T Power Pack Provides high voltage for the charge, development and transfer rollers.

  • Page 21: Drive Layout

    17 May, 1999 DRIVE LAYOUT 1.6 DRIVE LAYOUT A250V109.WMF 1. By-pass feed clutch 2. Vertical transport clutch 3. Registration clutch 4. Paper feed clutch 5. Main motor 1-11...

  • Page 22: Copy Process

    COPY PROCESS 17 May, 1999 1.7 COPY PROCESS 1.7.1 OVERVIEW –600 V –100 V –400 V A250V507.WMF 1. DRUM CHARGE In the dark, the charge roller gives a negative charge of –600 volts to the organic photo-conductive (OPC) drum. The charge remains on the surface of the drum because the OPC layer has a high electrical resistance in the dark.
  • Page 23 17 May, 1999 COPY PROCESS 4. IMAGE TRANSFER Paper is fed to the area between the drum surface and the transfer roller at the proper time for aligning the copy paper and the developed image on the drum surface. Then, the transfer roller applies a high positive charge to the reverse side of the paper.

  • Page 24: Board Structure

    BOARD STRUCTURE 17 May, 1999 1.8 BOARD STRUCTURE 1.8.1 OVERVIEW Scanner S B U Flat Cable Motor Scanner Sensors L D D Photo Circuit H a r n e s s Diode Board Motor Drive P C B I O B Polygon Mirror H a r n e s s...

  • Page 25: Description

    17 May, 1999 BOARD STRUCTURE 1.8.2 DESCRIPTION 1. BICU (Base Engine and Image Control Unit) The main board controls the following functions: · Engine sequence · Scanner, laser printer engine · Timing control for peripherals · Image processing, video control ·...

  • Page 26: Detailed Section Descriptions

    17 May, 1999 SCANNING 2. DETAILED SECTION DESCRIPTIONS 2.1 SCANNING 2.1.1 OVERVIEW A250D003.WMF An exposure lamp [A], a xenon lamp in this model, illuminates the original. The 1st, 2nd, 3rd mirrors, and lens [B] reflect the image onto the CCD (charge coupled device) [C].

  • Page 27: Scanner Drive

    SCANNING 17 May, 1999 2.1.2 SCANNER DRIVE A250D001.WMF The scanner drive motor [A] (a stepper motor) drives the 1st and 2nd scanners [B, C] through the timing belts [D], scanner drive pulley [E], and the Accuride rail at the rear. Book Mode The main CPU controls and operates the scanner drive motor.

  • Page 28: Original Size Detection In Platen Mode

    17 May, 1999 SCANNING 2.1.3 ORIGINAL SIZE DETECTION IN PLATEN MODE A250D526.WMF A250D002.WMF In the optics cavity, there are four reflective sensors in the 115 V machines, and six reflective sensors in the 230 V machines. These are the original width sensors [A] and the original length sensors [B], and they detect the length and width of the original.
  • Page 29 SCANNING 17 May, 1999 Original Size Length Sensors Width Sensors A4/A3 version LT/DLT version 11" x 17" 10" x 14" " x 14" (8" x 13") A4-L " x 11" B5-L — A4-S 11" x 8 " B5-S — : ON : OFF NOTE: The length sensors L1 and L2 are used only for 230 V machines.

  • Page 30: Image Processing

    17 May, 1999 IMAGE PROCESSING 2.2 IMAGE PROCESSING 2.2.1 OVERVIEW Circuit Data from SBU Auto Shading Gradation Processing S c a n n e r G a m m a Video Data Control E M B Application Correction (Fax or Printer Unit) LD Unit Magnification...
  • Page 31 IMAGE PROCESSING 17 May, 1999 Image Quality Adjustments The user can select text, text/photo, and photo mode, as usual. However, each of these original modes have a range of different types, as follows. Image adjustment (08) in the user tools Mode Default Text...

  • Page 32: Sbu (Sensor Board Unit)

    17 May, 1999 IMAGE PROCESSING 2.2.2 SBU (SENSOR BOARD UNIT) BICU A m p . O D D Z / C E V E N Z / C I P U A / D A G C Reference Controller Analog Processing IC Z/C: Zero Clamp G A - S 6 0 0...

  • Page 33: Auto Image Density (Ads)

    IMAGE PROCESSING 17 May, 1999 2.2.3 AUTO IMAGE DENSITY (ADS) A250D004.WMF In the SBU ADS prevents the background of an original from appearing on copies. The copier scans the image density area [A] detected by the ADS sensoras shown in the diagram. This corresponds to a few mm at one end of the main scan line. As the scanner scans down the page, the IPU on the BICU detects the peak white level for each scan line.

  • Page 34: Image Processing Unit (Ipu)

    17 May, 1999 IMAGE PROCESSING 2.2.4 IMAGE PROCESSING UNIT (IPU) Overview The image data from the SBU goes to the Image Processing Unit (IPU) IC on the BICU board, which carries out the following processes with the image data: · Auto shading ·...
  • Page 35 IMAGE PROCESSING 17 May, 1999 White Level Correction Before scanning the original, the machine reads a reference waveform from the white plate. The average of the white video level for each pixel is stored as the white shading data in the FIFO memory in the IPU chip. The video signal information for each pixel obtained during image scanning is corrected by the IPU chip.
  • Page 36 17 May, 1999 IMAGE PROCESSING Scanner Gamma ( C Correction The CCD output is not proportional to the quantity of the light received. Scanner gamma (g) correction corrects the CCD output so that grayscale data is proportion to the quantity of the light received. The machine has four possible scanner gamma curves.
  • Page 37 IMAGE PROCESSING 17 May, 1999 Main Scan Magnification/Reduction Main Scan Magnification/Reduction Changing the scanner speed enables reduction and enlargement in the sub-scan direction. However, the IPU chip handles reduction and enlargement in the main scan direction. The processing for main scan magnification/reduction is the same as in the previous digital machines.
  • Page 38 17 May, 1999 IMAGE PROCESSING Filtering Image adjustment (08) in the user tools Mode Default Text Toner Saving Normal Sharp (Service Mode) Text/Photo — Photo Priority Text Priority (Service Mode) Photo Coarse Press Print Glossy Print (Service Mode) Overview There are some software filters for enhancing the desired image qualities of the selected original mode.
  • Page 39 IMAGE PROCESSING 17 May, 1999 A250D601.WMF 2-14...
  • Page 40 17 May, 1999 IMAGE PROCESSING A250D602.WMF 2-15...
  • Page 41 IMAGE PROCESSING 17 May, 1999 Smoothing Filter Adjustment - Photo Mode Image adjustment (08) in the user tools Mode Default Text Toner Saving Normal Sharp (Service Mode) Text/Photo — Photo Priority Text Priority (Service Mode) Photo Coarse Press Print Glossy Print (Service Mode) When the user selects “Service Mode”...
  • Page 42 17 May, 1999 IMAGE PROCESSING ID Gamma ( C ) Correction ID Gamma (C Correction Image adjustment (08) in the user tools Mode Default Text Toner Saving Normal Sharp (Service Mode) Text/Photo — Photo Priority Text Priority (Service Mode) Photo Coarse Press Print Glossy Print...
  • Page 43 IMAGE PROCESSING 17 May, 1999 In error diffusion or simple binary picture processing, there are two possible types of threshold: constant threshold, and dynamic threshold. · The type that is used depends on the selected original type (text, text/photo, photo) and user tool Image Adjustment setting. ·...
  • Page 44 17 May, 1999 IMAGE PROCESSING · Edge detection: SP4-931 (vertical direction), 4-932 (horizontal direction), 4-933 (diagonal from top right to bottom left), 4-934 (diagonal from top left to bottom right). Decreasing the SP mode value causes a lighter line to be detected as an edge.

  • Page 45: Memory Controller And Extended Memory Board (Emb)

    IMAGE PROCESSING 17 May, 1999 2.2.5 MEMORY CONTROLLER AND EXTENDED MEMORY BOARD (EMB) Optional D R A M (48 MB) M e m o r y Controller B U S C P U D R A M BICU (16 MB) A250D528.WMF The BICU consists of the memory controller and the DRAM.

  • Page 46: Video Control Unit (Vcu)

    17 May, 1999 IMAGE PROCESSING 2.2.6 VIDEO CONTROL UNIT (VCU) Fine Character and Image (FCI) The FCI performs image smoothing and line width correction. These functions only affect binary picture processed images in sharp text mode. Smoothing Main Scan Direction Sub Scan Direction Fig.
  • Page 47 IMAGE PROCESSING 17 May, 1999 Toner Saving in Text Mode Image adjustment (08) in the user tools Mode Default Text Toner Saving Normal Sharp (Service Mode) Text/Photo — Photo Priority Text Priority (Service Mode) Photo Coarse Press Print Glossy Print (Service Mode) When toner saving in text mode is selected in the image adjustment sub-menu (08) of the user tools menu, an 8 x 8 matrix filter reduces the number of black dots in...

  • Page 48: Image Processing Summary

    17 May, 1999 IMAGE PROCESSING 2.2.7 IMAGE PROCESSING SUMMARY Text (Normal) This mode decreases moiré and prevents parts of low contrast text from disappearing from the copy. Recommended Originals: Normal text originals Image Processing Flow Related SP Modes A D S Scanning •...
  • Page 49 IMAGE PROCESSING 17 May, 1999 Text (Sharp) This mode prevents the rear side of a thin original from being visible, and the copy will have a lot of contrast. Recommended Originals: Newspaper, originals through which the rear side is visible. Image Processing Flow Related SP Modes A D S...
  • Page 50 17 May, 1999 IMAGE PROCESSING Text (Service Mode) For special text originals that need custom settings to produce the required copy quality. Image Processing Flow Related SP Modes • SP4-936-1 A D S • SP4-937-1 • SP4-938-1 Scanning • Auto Shading Image •...
  • Page 51 IMAGE PROCESSING 17 May, 1999 Text/Photo (Photo Priority) This mode emphasizes gradation and picture reproduction. Recommended Originals: Text/photo originals which contain mainly photo areas. Image Processing Flow Related SP Modes A D S Scanning • Auto Shading Image • SP4-942, 4-943 •...
  • Page 52 17 May, 1999 IMAGE PROCESSING Text/Photo (Text Priority) This mode maintains gradation and prevents characters in text from being deformed. Recommended Originals: Text/photo originals which contain mainly text areas. Image Processing Flow Related SP Modes A D S Scanning • Auto Shading Image •...
  • Page 53 IMAGE PROCESSING 17 May, 1999 Text/Photo (Service Mode) For special text/photo originals that need custom settings to produce the required copy quality. Image Processing Flow Related SP Modes • SP4-936-2 A D S • SP4-937-2 • SP4-938-2 Scanning • Auto Shading Image •...
  • Page 54 17 May, 1999 IMAGE PROCESSING Photo (Coarse Print) This mode emphasizes contrast of photo images, and results in coarse gradation. Recommended Originals: Large-image printed originals, with no text. Image Processing Flow Related SP Modes • Auto Shading • White/Black Line Erase •...
  • Page 55 IMAGE PROCESSING 17 May, 1999 Photo (Press Print) This mode emphasizes contrast of photo images, and results in medium gradation Recommended Originals: Fine-image printed originals, with no text. Image Processing Flow Related SP Modes • Auto Shading • White/Black Line Erase •...
  • Page 56 17 May, 1999 IMAGE PROCESSING Photo (Glossy Photo) This mode maintains the resolution of the original and reproduces the fine gradations. Recommended Original: Glossy photos Image Processing Flow Related SP Modes • Auto Shading • White/Black Line Erase • SP4-942, 4-943 Scanning Correction Image...
  • Page 57 IMAGE PROCESSING 17 May, 1999 Photo (Service Mode) For special photo originals that need custom settings to produce the required copy quality. Image Processing Flow Related SP Modes • SP4-936-3 A D S • SP4-937-3 • SP4-938-3 Scanning Image • Auto Shading Correction •...

  • Page 58: Laser Exposure

    17 May, 1999 LASER EXPOSURE 2.3 LASER EXPOSURE 2.3.1 OVERVIEW A250D000.WMF This machine uses a laser diode to produce electrostatic images on the OPC drum [A] in the all-in-one cartridge [B]. The laser diode unit [C] converts image data from the BICU board into laser pulses, and the optical components direct these pulses to the drum.

  • Page 59: Optical Path

    LASER EXPOSURE 17 May, 1999 2.3.2 OPTICAL PATH A250D306.WMF [A]: Polygonal mirror [G]: BTL (Barrel Toroidal Lens) [B]: Cylindrical lens [H]: 1st mirror [C]: LD drive board [I]: Laser synchronization detector [D]: Drum [J]: Toner shield glass [E]: LD shutter [F]: F-theta mirror The optical path from the laser diode to the drum is shown above.

  • Page 60: Auto Power Control (Apc)

    17 May, 1999 LASER EXPOSURE 2.3.3 AUTO POWER CONTROL (APC) LD Drive Board V C C L E V E L LD Driver V I D E O L D M O D E L D O F F A250D308.WMF To prevent the intensity of the laser beam from changing because of the temperature, the machine monitors the laser beam with a photodiode (PD).

  • Page 61: Ld Safety Switch

    LASER EXPOSURE 17 May, 1999 2.3.4 LD SAFETY SWITCH BICU Board LD Drive Board LD Driver + 5 V Right Door Switch 1 A250D555.WMF Right Door Switch 1 To ensure that the laser beam does not inadvertently switch on during servicing, there is a safety switch inside the right door.

  • Page 62: All-In-One Cartridge (Aio Cartridge)

    17 May, 1999 ALL-IN-ONE CARTRIDGE (AIO CARTRIDGE) 2.4 ALL-IN-ONE CARTRIDGE (AIO CARTRIDGE) 2.4.1 OVERVIEW A250D509.WMF The AIO cartridge (all-in-one cartridge) consists of the components shown above. It contains the OPC drum and the toner cassette, and includes the mechanisms for drum charge, development, and cleaning.

  • Page 63: Drive

    ALL-IN-ONE CARTRIDGE (AIO CARTRIDGE) 17 May, 1999 2.4.2 DRIVE A250D510.WMF The main motor [A] drives the drum [B], the development roller [C], and agitators [D] through a series of gears. The BICU controls the main motor speed. 2-38...

  • Page 64: Drum Charge

    17 May, 1999 ALL-IN-ONE CARTRIDGE (AIO CARTRIDGE) 2.4.3 DRUM CHARGE A250D511.WMF This machine uses a drum charge roller system instead of a scorotron corona wire system to charge the drum. The drum charge roller [A] always contacts the surface of the drum [B] because of the charge roller pressure springs [C], and gives a negative charge to the drum surface.

  • Page 65: Development

    ALL-IN-ONE CARTRIDGE (AIO CARTRIDGE) 17 May, 1999 2.4.4 DEVELOPMENT Overview A250D509.WMF This machine uses monocomponent toner. There are two agitators [A] in the AIO cartridge (shown above). The agitator(s) [A] and the mixing blade [B] mix the toner in the AIO cartridge and transport it to the development roller [C].
  • Page 66 17 May, 1999 ALL-IN-ONE CARTRIDGE (AIO CARTRIDGE) Toner End Detection High A250D666.WMF There is no toner end sensor in this machine. Instead, toner end is detected using the toner near-end sensor. When the toner near-end sensor detects a low toner condition for five seconds continuously [A], the machine starts the toner near-end copy counter.
  • Page 67 ALL-IN-ONE CARTRIDGE (AIO CARTRIDGE) 17 May, 1999 The following table shows how the two SP modes can be used to customize the toner near-end and end intervals. SP2-214 setting SP2-213 setting (count start to near-end) (near-end to end) 0: Normal 1: Low 2: High ®...

  • Page 68: Drum Cleaning

    17 May, 1999 ALL-IN-ONE CARTRIDGE (AIO CARTRIDGE) 2.4.5 DRUM CLEANING A250D512.WMF The cleaning blade [A] removes any toner remaining on the drum after the image is transferred to the paper. The cleaning blade scrapes off the remaining toner on the drum automatically transferring it to the collection area.

  • Page 69: Image Transfer And Paper Separation

    IMAGE TRANSFER AND PAPER SEPARATION 17 May, 1999 2.5 IMAGE TRANSFER AND PAPER SEPARATION 2.5.1 OVERVIEW A250D513.WMF The machine uses a transfer roller [A], which touches the surface of the drum [B]. The Power Pack - B/C/T supplies a positive current to the transfer roller, which attracts the toner from the drum onto the paper.

  • Page 70: Transfer Current Settings

    17 May, 1999 IMAGE TRANSFER AND PAPER SEPARATION 2.5.2 TRANSFER CURRENT SETTINGS NOTE: ‘Special’ paper in the SP modes appears as “Dry” paper in the user tools. Paper Tray By-pass Feed Paper Size Normal Special Normal Thick Special Paper Paper Paper Paper Paper...

  • Page 71: Transfer Roller Cleaning

    IMAGE TRANSFER AND PAPER SEPARATION 17 May, 1999 2.5.3 TRANSFER ROLLER CLEANING If the paper size is smaller than the image, or if a paper jam occurs during printing, toner may be transferred to the roller surface. To prevent the toner from transferring to the back side of the printouts, the transfer roller requires cleaning before the next printing run.

  • Page 72: Paper Feed

    17 May, 1999 PAPER FEED 2.6 PAPER FEED 2.6.1 OVERVIEW A250D201.WMF There is a built-in paper tray (tray 1) [A] and a by-pass tray [B]. The paper tray holds 250 sheets. The by-pass tray can hold 100 sheets of paper. The paper feed roller [C] drives the top sheet of paper from the paper tray to the registration rollers [D].

  • Page 73: Built-In Tray

    PAPER FEED 17 May, 1999 2.6.2 BUILT-IN TRAY A250D104.WMF Bottom Plate Lift The tray bottom plate [A] is lifted by a compressed spring, and it lifts the paper to the paper feed roller. When the cassette is being pulled out, the tray bottom plate is dropped by the cassette arm [B], which is connected to the cassette lever (handle) [C], and is locked by the stopper [D].
  • Page 74 17 May, 1999 PAPER FEED Paper Feed Drive A250D518.WMF The main motor drives the pick-up and feed mechanism. The tray paper feed clutch [A] transfers drive from the main motor to the paper feed roller [B]. This machine uses a feed roller and friction pad mechanism. The friction pad [C] only allows the top sheet to feed.
  • Page 75 PAPER FEED 17 May, 1999 Paper Size Detection A250D108.WMF The paper size switch [A] includes three sensors (microswitches). Actuators on a dial [B] behind the paper size indicator plate actuate the sensors. Each paper size has its own actuator, with a unique combination of notches. To determine the paper size, the CPU reads which switches the actuator has turned off.

  • Page 76: By-Pass Tray

    17 May, 1999 PAPER FEED 2.6.3 BY-PASS TRAY Drive A250D999.WMF When paper is placed on the tray, the by-pass tray paper feeler [A] is pushed up and the actuator leaves the by-pass tray paper sensor [B]. The by-pass tray paper feed clutch [C] transfers drive from the main motor to the by-pass feed roller [D].
  • Page 77 PAPER FEED 17 May, 1999 Paper Size Detection A250D107.WMF The by-pass feed paper width sensor [A] monitors the paper width. The side fence is connected to the terminal plate gear. When the side fences move to match the paper width, the circular terminal plate rotates over the wiring patterns on the rectangular part of the width sensor.

  • Page 78: Paper Registration

    17 May, 1999 PAPER FEED 2.6.4 PAPER REGISTRATION A250D518.WMF Main motor rotation is transmitted to the registration clutch gear [A]. The registration sensor [B] is just before the registration rollers [C]. When the paper leading edge activates the registration sensor, the registration clutch [D] turns on and the registration rollers start turning a little bit afterward.

  • Page 79: Misfeed Detection

    PAPER FEED 17 May, 1999 2.6.5 MISFEED DETECTION Scanner 1-bin tray exit sensor 1-bin sorter door Right door Fusing exit sensor Registration sensor Vertical transport cover 1st tray Vertical transport sensor 2nd tray Vertical transport sensor (Optional paper feed unit) 3rd tray Optional paper unit cover A250D603.WMF...
  • Page 80 17 May, 1999 PAPER FEED Registration sensor ON check When the registration sensor does not turn on within a certain time after the paper feed clutch turns on (1st tray: 2.0 s, 2nd tray: 1.3 s, 3rd tray: 1.7 s). Registration sensor OFF check During multi-page printing, the registration sensor is not turned off by the trailing edge of the current page after the paper feed clutch turns on to feed the next page.
  • Page 81 PAPER FEED 17 May, 1999 1 bin tray exit sensor ON check When the 1 bin tray exit sensor does not turn on within 1.8 seconds after the fusing exit sensor turns on. 1 bin tray exit sensor OFF check During multi-page printing, the 1-bin tray exit sensor is not turn off by the trailing edge of the previous page after the designated time.

  • Page 82: Image Fusing

    17 May, 1999 IMAGE FUSING 2.7 IMAGE FUSING 2.7.1 OVERVIEW A250D508.WMF The fusing unit consists of the following parts. 1. Pressure Roller Release Lever 6. Hot Roller 2. Pressure Spring 7. Exit Roller 3. Fusing Lamp 8. Fusing Exit Sensor 4.

  • Page 83: Fusing Unit Drive

    IMAGE FUSING 17 May, 1999 A250D503.WMF After the image has been transferred, the paper enters the fusing unit. The image is fused to the paper by applying heat and pressure through the combined use of the hot roller [A], fusing lamp [B], and pressure roller. The CPU monitors the hot roller temperature through the fusing thermistor [C], which is in contact with the hot roller surface.

  • Page 84: Pressure Roller/Paper Exit

    17 May, 1999 IMAGE FUSING 2.7.3 PRESSURE ROLLER/PAPER EXIT A250D505.WMF During printing, the pressure roller [A] is pressed against the hot roller [B] by springs. The hot roller strippers [C] separate the paper from the hot roller and direct it to the exit roller.

  • Page 85: Fusing Temperature Control

    IMAGE FUSING 17 May, 1999 2.7.5 FUSING TEMPERATURE CONTROL Overview A250D328.WMF The fusing temperature is controlled using the fusing thermistor [A]. The CPU checks the output from the fusing thermistor once a second. The CPU compares the current and previous temperature, then decides the power-on ratio for the next second.
  • Page 86 17 May, 1999 IMAGE FUSING Copying (North America Model) Sampling cycle: 1 second Soft start setting: 6 cycles Current minus Target ° ° ° ° ° ° ° ° –2 C or C or C or C or Previous minus Current °...
  • Page 87 IMAGE FUSING 17 May, 1999 Fluorescent Lamp Flicker Starting and stopping the fusing lamp power every second causes fluorescent lighting in the room to flicker. To reduce this flickering, use SP1-108 to change the cycle from 1 second to 3 seconds. In addition, full power is applied to the fusing lamp gradually, not all at once.

  • Page 88: Overheat Protection

    17 May, 1999 IMAGE FUSING 2.7.6 OVERHEAT PROTECTION If the hot roller temperature becomes greater than 230°C for more than 1 second, the CPU cuts off the power to the fusing lamp. At this time, the LCD will display an SC543 error.
  • Page 89 IMAGE FUSING 17 May, 1999 Returning to Standby Mode From Energy Saver Level 1 or 2 If one of the following is done, the machine returns to standby mode. · Pressing the Energy Saver key · Opening and closing the tray cover ·...

  • Page 90: Installation

    17 May, 1999 INSTALLATION REQUIREMENTS 3. INSTALLATION CAUTION Before installing options, do the following: 1. If there is a fax unit in the machine, print out all messages stored in the memory, the lists of user-programmed items, and the system parameter list.

  • Page 91: Machine Level

    INSTALLATION REQUIREMENTS 17 May, 1999 3. Ambient Illumination: Less than 1,500 lux (do not expose to direct sunlight.) 4. Ventilation: Room air should turn over at least 30 m /hr/person 5. Ambient Dust: Less than 0.10 mg/m (2.7 x 10 oz/yd 6.

  • Page 92: Minimum Space Requirements

    17 May, 1999 INSTALLATION REQUIREMENTS 3.1.3 MINIMUM SPACE REQUIREMENTS Place the copier near the power source, providing clearance as shown: A250I145.WMF A: In front : Over 750 mm (29.6") C: To rear: Over 10 mm (0.4") B: Left: Over 20 mm (0.8") D: Right: Over 10 mm (0.4") NOTE: 1) The 750 mm recommended for the front space is for pulling out the...

  • Page 93: Power Requirements

    INSTALLATION REQUIREMENTS 17 May, 1999 3.1.4 POWER REQUIREMENTS CAUTION: 1) Make sure that the wall outlet is near the copier and easily accessible. Make sure the plug is inserted firmly in the outlet. 2) Avoid multi-wiring. 3) Be sure to ground the machine. 1.

  • Page 94: Copier Installation

    17 May, 1999 COPIER INSTALLATION 3.2 COPIER INSTALLATION 3.2.1 ACCESSORY CHECK Check the quantity and condition of the accessories in the box against the following list: Description Quantity 1. Operation Instructions - System Setting........1 2. Operation Instructions - Copy Reference ........1 3.

  • Page 95: Copier Installation Procedure

    COPIER INSTALLATION 17 May, 1999 3.2.2 COPIER INSTALLATION PROCEDURE CAUTION Rating voltage for peripherals Make sure to plug the cables into the correct sockets. 1. ADF 1. Rating voltage output connector for accessory Max. DC24 V A250I209.WMF...
  • Page 96 17 May, 1999 COPIER INSTALLATION A250I210.WMF NOTE: Since the installation procedure is not a copier accessory, always bring this manual with you. CAUTION When installing the copier, make sure to keep the power cord unplugged. 1. Remove the tape strips.
  • Page 97 COPIER INSTALLATION 17 May, 1999 A250I501.WMF A250I500.WMF 2. Pull the paper tray [A] out and turn the paper size dial [B] to select the appropriate size. Adjust the side guides [C] and end guide [D] to match the paper size.
  • Page 98 17 May, 1999 COPIER INSTALLATION A250I189.WMF A250I190.WMF A250I192.WMF A250I191.WMF 3. Open the right door [A]. 4. Shake the toner cartridge [B] well several times. 5. Pull out horizontally and remove the tape [C] inside the toner cartridge, as shown. 6. Install the toner cartridge [D] in the copier. 7.

  • Page 99: Adf Installation

    ADF INSTALLATION 17 May, 1999 3.3 ADF INSTALLATION 3.3.1 ACCESSORY CHECK Check the quantity and condition of the accessories in the box against the following list: Description Quantity 1. Stepped Screw................2 2. Knob Screw................2 3. Driver Tool ................1 4.

  • Page 100: Adf Installation Procedure

    17 May, 1999 ADF INSTALLATION 3.3.2 ADF INSTALLATION PROCEDURE A859I101.WMF 1. Remove the strips of tape. 3-11...
  • Page 101 ADF INSTALLATION 17 May, 1999 A859I111.WMF A859I110.WMF 2. Remove the left scale [A] (2 screws). 3. Place the DF exposure glass [B] on the glass holder. NOTE: When installing the DF exposure glass, make sure that the white point [C] is positioned at the lower front side, as shown. 4.
  • Page 102 17 May, 1999 ADF INSTALLATION A859I102.WMF 9. Attach the decal [A] as shown. 10. Plug in the power cord, then turn the main switch on. 11. Make a full size copy from the 1st tray using the ADF. Then check to make sure the side-to-side and leading edge registrations are correct.

  • Page 103: Paper Tray Unit (1 Tray) Installation

    PAPER TRAY UNIT (1 TRAY) INSTALLATION 17 May, 1999 3.4 PAPER TRAY UNIT (1 TRAY) INSTALLATION 3.4.1 ACCESSORY CHECK Check the quantity and condition of the accessories in the box against the following list: Description Quantity 1. Screw - M4 x 10 ................ 4 2.

  • Page 104: Paper Tray Unit Installation Procedure

    17 May, 1999 PAPER TRAY UNIT (1 TRAY) INSTALLATION 3.4.2 PAPER TRAY UNIT INSTALLATION PROCEDURE A861I159.WMF 1. Remove the strips of tape. 3-15...
  • Page 105 PAPER TRAY UNIT (1 TRAY) INSTALLATION 17 May, 1999 A861I172.WMF A861I157.WMF A861I163.WMF 2. Remove the cover [A] (1 screw) and pull out the cable [B]. 3. Set the copier [C] on the paper tray unit [D]. NOTE: When installing the copier, be careful not to pinch the cable [B]. 4.
  • Page 106 17 May, 1999 PAPER TRAY UNIT (1 TRAY) INSTALLATION A861I152.WMF A861I162.WMF A861I164.WMF 5. Install the two stepped screws [A]. 6. Re-install the 1st cassette tray. 7. Install the two brackets [B] (1 screw each). 8. Connect the cable [C] to the copier, as shown. NOTE: There are cutouts on both sides of the connector.

  • Page 107: Paper Tray Unit (2 Trays) Installation

    PAPER TRAY UNIT (2 TRAYS) INSTALLATION 17 May, 1999 3.5 PAPER TRAY UNIT (2 TRAYS) INSTALLATION 3.5.1 ACCESSORY CHECK Check the quantity and condition of the accessories in the box against the following list: Description Quantity 1. Screw - M4 x 10 ................ 4 2.

  • Page 108: Paper Tray Unit Installation Procedure

    17 May, 1999 PAPER TRAY UNIT (2 TRAYS) INSTALLATION 3.5.2 PAPER TRAY UNIT INSTALLATION PROCEDURE A860I158.WMF 1. Remove the strips of tape. 3-19...
  • Page 109 PAPER TRAY UNIT (2 TRAYS) INSTALLATION 17 May, 1999 A860I172.WMF A860I156.WMF A860I163.WMF 2. Remove the cover [A] (1 screw) and pull out the cable [B]. 3. Set the copier [C] on the paper tray unit [D]. NOTE: When installing the copier, be careful not to pinch the cable [B]. 4.
  • Page 110 17 May, 1999 PAPER TRAY UNIT (2 TRAYS) INSTALLATION A860I151.WMF A860I162.WMF 5. Install the two stepped screws [A]. 6. Re-install the 1st tray cassette. 7. Install the two brackets [B] (1 screw each). 3-21...
  • Page 111 PAPER TRAY UNIT (2 TRAYS) INSTALLATION 17 May, 1999 A860I164.WMF A860I007.WMF 8. Connect the cable [A] to the copier, as shown. NOTE: There are cutouts on both sides of the connector. The left side has one cutout, and the right side has two. 9.

  • Page 112: 1-Bin Sorter Installation

    17 May, 1999 1-BIN SORTER INSTALLATION 3.6 1-BIN SORTER INSTALLATION 3.6.1 ACCESSORY CHECK Check the quantity and condition of the accessories in the box against the following list: Description Quantity 1. Screw - M3 x 6 ................1 2. Installation Procedure ............... 1 3-23...

  • Page 113: 1-Bin Sorter Installation Procedure

    1-BIN SORTER INSTALLATION 17 May, 1999 3.6.2 1-BIN SORTER INSTALLATION PROCEDURE A869I173.WMF 1. Remove the strips of tape. NOTE: There is a screw in the plastic bag [A]. 3-24...
  • Page 114 17 May, 1999 1-BIN SORTER INSTALLATION A869I117.WMF A869I105.WMF 2. Open the right door [A]. 3. Release the levers [B] and remove the fusing unit [C] (2 screws). 4. Remove the small front cover [D] (1 screw). 5. Remove the cap [E] with a wire cutter [F]. 3-25...
  • Page 115 1-BIN SORTER INSTALLATION 17 May, 1999 A869I136.WMF A869I106.WMF 6. Remove the cap [A] with a wire cutter [B]. 7. Remove the cover [C] (1 rivet [D]), located inside the one-bin sorter area. 3-26...
  • Page 116 17 May, 1999 1-BIN SORTER INSTALLATION A869I107.WMF A869I108.WMF 8. Connect the connector [A] for the 1-bin sorter unit [B], as shown. NOTE: Before installing the 1-bin sorter unit, check that the component under the connector [A] is not bent. 9. Set the pins [C] for the 1-bin sorter unit and secure the unit with the screw from the accessories [D].
  • Page 117 1-BIN SORTER INSTALLATION 17 May, 1999 A869I109.WMF A869I174.WMF 10. Install the bin [A], as shown. NOTE: Mount the bin on the 1-bin sorter unit. 11. Re-install the small front cover and fusing unit. NOTE: When re-installing the small front cover, be careful not to pinch the cable.

  • Page 118: Platen Cover Installation

    17 May, 1999 PLATEN COVER INSTALLATION 3.7 PLATEN COVER INSTALLATION 3.7.1 ACCESSORY CHECK Check the quantity and condition of the accessories in the box against the following list: Description Quantity 1. Stepped Screw................2 3.7.2 PLATEN COVER INSTALLATION PROCEDURE A250I111.WMF 1.

  • Page 119: Extended Memory Board Installation

    EXTENDED MEMORY BOARD INSTALLATION 17 May, 1999 3.8 EXTENDED MEMORY BOARD INSTALLATION 3.8.1 ACCESSORY CHECK Check the quantity and condition of the accessories in the box against the following list: Description Quantity 1. Screw - M3 x 6 (two of these are not for use with A250) ....4 2.

  • Page 120: Extended Memory Board Installation Procedure

    17 May, 1999 EXTENDED MEMORY BOARD INSTALLATION 3.8.2 EXTENDED MEMORY BOARD INSTALLATION PROCEDURE A887I176.WMF A887I113.WMF CAUTION Before installing this option, do the following: 1. If there is a fax unit in the machine, print out all messages stored in the memory, the lists of user-programmed items, and the system parameter list.

  • Page 121: Drum Heater Installation (Option)

    DRUM HEATER INSTALLATION (OPTION) 17 May, 1999 3.9 DRUM HEATER INSTALLATION (OPTION) A250I001.WMF 1. Remove the left cover, copy tray, and front cover. (See Exterior Removal, section 6.1.) 2. Remove the AIO cartridge. 3. Remove the fusing unit. (Refer to Fusing Unit Removal, section 6.5.1.) 4.

  • Page 122: Optics Anti-Condensation Heater Installation (Option)

    17 May, 1999 OPTICS ANTI-CONDENSATION HEATER INSTALLATION (OPTION) 3.10 OPTICS ANTI-CONDENSATION HEATER INSTALLATION (OPTION) A250I002.WMF 1. Remove the exposure glass. (See Exposure Glass Removal, section 6.2.1.) 2. Remove the rear cover. (See Rear Cover Removal, section 6.1.1.) 3. Pass the connector [A] through the opening [B]. 4.

  • Page 123: Tray Heater Installation

    TRAY HEATER INSTALLATION 17 May, 1999 3.11 TRAY HEATER INSTALLATION A250I202.WMF 1. Remove the rear cover for the paper tray unit [A] (2 screws). 3-34...
  • Page 124 17 May, 1999 TRAY HEATER INSTALLATION - 1-tray paper feed unit - - 2-tray paper feed unit - A250I007.WMF A250I004.WMF 2. Two-tray unit only: Remove the cable guide [A] (1 screw). 3. Install the clamps [B]. 3-35...
  • Page 125 TRAY HEATER INSTALLATION 17 May, 1999 - 1-tray paper feed unit - - 2-tray paper feed unit - A250I009.WMF A250I005.WMF 4. Pass the connector [A] through the opening [B]. 5. Install the tray heater [C] (1 screw). 3-36...
  • Page 126 17 May, 1999 TRAY HEATER INSTALLATION - 1-tray paper feed unit - - 2-tray paper feed unit - A250I008.WMF A250I006.WMF 6. Clamp the cables [A], as shown. 7. Join the connectors [B]. 8. Two-tray unit only: Re-install the cable guide. 3-37...
  • Page 127 TRAY HEATER INSTALLATION 17 May, 1999 - 1-tray paper feed unit - - 2-tray paper feed unit - A250I150.WMF A250I149.WMF 9. Remove the two screws [A] from the rear side of the paper feed unit. 3-38...
  • Page 128 17 May, 1999 TRAY HEATER INSTALLATION A250I003.WMF 10. Remove the 1st tray. 11. Remove the two screws [A] and install the two screws [B] which were removed in step 9. 12. Re-install the 1st tray and rear cover. 3-39...

  • Page 129: Service Tables

    17 May, 1999 GENERAL CAUTION 4. SERVICE TABLES 4.1 GENERAL CAUTION Do not turn off the main switch while any of the electrical components are active. Doing so might cause damage to units, such as the AIO, when they are pulled out of or put back into the copier.

  • Page 130: Laser Unit

    GENERAL CAUTION 17 May, 1999 4.1.4 LASER UNIT 1. Do not loosen the screws that secure the LD drive board to the laser diode casing. Doing so would throw the LD unit out of adjustment. 2. Do not adjust the variable resistors on the LD unit, as they are adjusted in the factory.

  • Page 131: Service Program Mode

    17 May, 1999 SERVICE PROGRAM MODE 4.2 SERVICE PROGRAM MODE 4.2.1 SERVICE PROGRAM MODE OPERATION The service program (SP) mode is used to check electrical data, change modes, and adjust values. Service Program Access Procedure How to Enter the SP Mode Press the following keys in sequence.

  • Page 132: Service Program Mode Tables

    SERVICE PROGRAM MODE 17 May, 1999 To input a value or setting for an SP mode 1. Enter the required program mode as explained above. 2. Enter the required setting using the numeric keys, then press the k key or “OK”...
  • Page 133 17 May, 1999 SERVICE PROGRAM MODE Mode No. Function Settings Class Class 1 and 2 Side-to-Side Regist. +9 ~ –9 Adjusts the printing side-to-side (1st Paper Feed) registration from the 1st paper feed 0.1 mm/step +0.0 mm station using the Trimming Area Pattern (SP5-902, No.10).
  • Page 134 SERVICE PROGRAM MODE 17 May, 1999 Mode No. Function Settings Class Class 1 and 2 Fusing Idling 0: No Selects whether fusing idling is done 1: Yes or not. Normally disabled in this machine. However, if fusing is incomplete on 1-103* the 1st and 2nd copies, switch it on.
  • Page 135 17 May, 1999 SERVICE PROGRAM MODE Mode No. Function Settings Class Class 1 and 2 Fusing Soft Start Setting Selects whether the fusing 0: 1 sec temperature control cycle is 1 or 3 1: 3 sec seconds. 1-108* If this is “1”, the power supply fluctuates less when the fusing lamp turns on.
  • Page 136 SERVICE PROGRAM MODE 17 May, 1999 Mode No. Function Settings Class Class 1 and 2 Paper Tray Adj. Optional Paper Tray Unit Only: 0 ~ 9000 (S Size Comeback T - 1) Adjusts the upper lift motor forward 1 ms/step 300 ms rotation time for paper of the same size as or smaller than the small size...
  • Page 137 17 May, 1999 SERVICE PROGRAM MODE Mode No. Function Settings Class Class 1 and 2 Paper Tray Adj. Optional Paper Tray Unit Only: 0: Non (M Size Setting - 1) Selects the middle size threshold for (Not use) the upper tray. 1: HLT “0”...
  • Page 138 SERVICE PROGRAM MODE 17 May, 1999 Mode No. Function Settings Class Class 1 and 2 Paper Tray Adj. 0 ~ 9000 Optional Paper Tray Unit Only: (S Size Comeback T - 2) 1 ms/step Adjusts the lower lift motor forward 300 ms rotation time for paper of the same size as or smaller than the small size...
  • Page 139 17 May, 1999 SERVICE PROGRAM MODE Mode No. Function Settings Class Class 1 and 2 Paper Tray Adj. Optional Paper Tray Unit Only: 0: Non (M Size Setting - 2) Selects the middle size threshold for (Not use) the lower tray. 1: HLT “0”...
  • Page 140 SERVICE PROGRAM MODE 17 May, 1999 Mode No. Function Settings Class Class 1 and 2 Development Bias 0 ~ –1000 Adjusts the development bias during Adjustment 1 V/step copying. –400 V 2-201* This can be adjusted as a temporary measure if faint copies appear due to an aging drum.
  • Page 141 17 May, 1999 SERVICE PROGRAM MODE Mode No. Function Settings Class Class 1 and 2 Gradation Type This is for the designer’s test purposes. 2-905* Do not change the value. 0: No Transfer Roller Cleaning Determines how often the transfer roller is cleaned.
  • Page 142 SERVICE PROGRAM MODE 17 May, 1999 Mode No. Function Settings Class Class 1 and 2 Side-to-side Registration – 9.0 ~ + 6.0 Adjusts the side-to-side registration 0.1 mm/step for scanning in platen mode. 0.0 mm (–): The image disappears at the left side.
  • Page 143 17 May, 1999 SERVICE PROGRAM MODE Mode No. Function Settings Class Class 1 and 2 White Plate Scanning – 3.0 ~ + 3.0 Adjusts the width of the area on the (Scanning Area) white plate (in the sub scan 0.1 mm/step 0.0 mm direction) that is scanned for auto shading.
  • Page 144 SERVICE PROGRAM MODE 17 May, 1999 Mode No. Function Settings Class Class 1 and 2 IPU/SBU Test Pattern Prints test patterns from the IPU or SBU video data outputs. (1 ~ 13: IPU, 14 ~ 16: SBU) 0. No Print 1.
  • Page 145 17 May, 1999 SERVICE PROGRAM MODE Mode No. Function Settings Class Class 1 and 2 SBU DC Cont 0 ~ 255 Adjusts the coefficient of the D/A Adjustment converter for the AGC gain curve for 1/step (EVEN) DC cont for the EVEN channel. Do not change the value.
  • Page 146 SERVICE PROGRAM MODE 17 May, 1999 Mode No. Function Settings Class Class 1 and 2 Scanner Motor Control 0: Normal Selects the scanner motor control 1: Special method. If “1” is selected, the current for the scanner motor will be reduced and 4-910* jitter copy image problems will be alleviated.
  • Page 147 17 May, 1999 SERVICE PROGRAM MODE Mode No. Function Settings Class Class 1 and 2 P - MTF Coefficient This adjustment is only effective 0 ~ 15 (T/P Main 160%~200%) for the “Service Mode” original 1/step 4-915* type setting. Selects the MTF filter coefficient. P - MTF Coefficient 0 ~ 13 See “Detailed Descriptions - Image...
  • Page 148 SERVICE PROGRAM MODE 17 May, 1999 Mode No. Function Settings Class Class 1 and 2 P - MTF Strength This adjustment is only effective 0 ~ 7 (T/P Main 126%~159%) for the “Service Mode” original 1/step type setting. Selects the MTF strength using P - MTF Strength 0 ~ 7 grayscale processing.
  • Page 149 17 May, 1999 SERVICE PROGRAM MODE Mode No. Function Settings Class Class 1 and 2 This adjustment is only effective 0: Pat-1 P - Smoothing - Main for the “Service Mode” original 1: Pat-2 Scan (Text) type setting. 2: Pat-3 P - Smoothing - Main Selects the smoothing pattern for the 3: Through...
  • Page 150 SERVICE PROGRAM MODE 17 May, 1999 Mode No. Function Settings Class Class 1 and 2 P - Binary Threshold - 0 ~ 255 Adjusts the threshold in dynamic Center 1/step binary mode for pixels not on edges of text/graphic elements. This adjustment is only effective for the “Text - Service Mode”...
  • Page 151 17 May, 1999 SERVICE PROGRAM MODE Mode No. Function Settings Class Class 1 and 2 P - Matrix Filter (Photo) Selects the dither matrix filter in 0: 53 photo mode. A larger number 1: 105 increases the number of gradations, 2: 143 but may reduce the contrast.
  • Page 152 SERVICE PROGRAM MODE 17 May, 1999 Mode No. Function Settings Class Class 1 and 2 P - Edge 0 ~ 255 Adjusts the threshold for edge Threshold - Left 1/step detection in the diagonal direction from top left to bottom right (for dynamic thresholding).
  • Page 153 17 May, 1999 SERVICE PROGRAM MODE Mode No. Function Settings Class Class 1 and 2 This adjustment is only effective 0 ~ 15 P - IPU ADS Adjustment for the “Service Mode” original (Text) 1/step type setting. P - IPU ADS Adjustment Decides how much is subtracted (Text/Photo) from the white video level.
  • Page 154 SERVICE PROGRAM MODE 17 May, 1999 Mode No. Function Settings Class Class 1 and 2 0: Normal White Line Erase Selects whether or not white line erase is done (without “Service 1: Disable Mode”). 4-942* See “Detailed Descriptions - Image Processing”...
  • Page 155 17 May, 1999 SERVICE PROGRAM MODE Mode No. Function Settings Class Class 1 and 2 User Code Mode 0: No Selects whether the user code (Copier) feature is enabled in copy mode or 1: Yes not. If this value is changed, the user tool setting is also changed.
  • Page 156 SERVICE PROGRAM MODE 17 May, 1999 Mode No. Function Settings Class Class 1 and 2 Display Language Selects the display language. 5-808* See “Display language” for details. mm/inch Selection Selects whether mm or inches are 0: mm (Europe/Asia used in the display. model) 5-809* 1: inch...
  • Page 157 17 May, 1999 SERVICE PROGRAM MODE Mode No. Function Settings Class Class 1 and 2 NVRAM Data Upload Uploads SP and UP mode data 0: No (except for counters and the serial 1: Yes number) from the flash memory on the BICU board to a flash memory card.
  • Page 158 SERVICE PROGRAM MODE 17 May, 1999 Mode No. Function Settings Class Class 1 and 2 Exhaust Fan Control Inputs the fan control timer for Timer energy saver mode. The fan slows down after this time has passed since the end of a job The fan stops after this time has 5-906* passed since any of the following...
  • Page 159 17 May, 1999 SERVICE PROGRAM MODE Mode No. Function Settings Class Class 1 and 2 Fax Forwarding Mode Selects whether the fax mode key is 0: No accepted when an SC has occurred. 1: Yes When an SC occurs while there are received fax messages in the SAF 5-930* memory, change the value to “1”.
  • Page 160 SERVICE PROGRAM MODE 17 May, 1999 Mode No. Function Settings Class Class 1 and 2 ADF Registration Adjusts the side-to-side registration –5.5 ~ +9.5 (Side-to-Side) in the ADF mode. 0.1 mm/step 0.0 mm Use the key to toggle between + and - before entering the value.
  • Page 161 17 May, 1999 SERVICE PROGRAM MODE Mode No. Function Settings Class Class 1 and 2 Binding Hole Range Adjusts the maximum binding hole 0 ~ 20 size for originals. If the original set 1 mm/step 6-911* sensor in the ADF detects a gap 12 mm wider than this, it assumes that a new page has just started to feed in.
  • Page 162 SERVICE PROGRAM MODE 17 May, 1999 Mode No. Function Settings Class Class 1 and 2 Copy Counter - Paper Displays the total number of copies Tray (1st) fed from each paper feed tray. Copy Counter - Paper Tray (2nd) 7-204* Copy Counter - Paper Tray (3rd) Copy Counter - Paper...
  • Page 163 17 May, 1999 SERVICE PROGRAM MODE Mode No. Function Settings Class Class 1 and 2 Total Jams by Location Displays the total number of paper (A Jam) jams by location. Total Jams by Location (B Jam) Total Jams by Location (C Jam) Total Jams by Location (R Jam)
  • Page 164 SERVICE PROGRAM MODE 17 May, 1999 Mode No. Function Settings Class Class 1 and 2 Resets Counters Resets the counters except for the 0: No total counter (SP7-003) and the 1: Yes timer counter (SP7-991). Press down the “Photo mode” key 7-808 and the “OK”...
  • Page 165 17 May, 1999 SERVICE PROGRAM MODE Mode No. Function Settings Class Class 1 and 2 Orig. Jam History Clear Resets the original jam history. 0: No 1: Yes Press down the “Photo mode” key and the “OK” or key at the same 7-906 time to reset the counter.

  • Page 166: Test Pattern Printing (Sp5-902)

    SERVICE PROGRAM MODE 17 May, 1999 4.2.3 TEST PATTERN PRINTING (SP5-902) 1. Input the level 3 number for the test pattern you need. 2. Press the / (Interrupt) key on the display to access the copy mode display. 3. Select the required copy features such as paper size, image density, and reproduction ratio.

  • Page 167: Input Check (Sp5-803)

    17 May 1999 SERVICE PROGRAM MODE 4.2.4 INPUT CHECK (SP5-803) [Serviceman P-Mode] Input Check Code: Prev. Next B a c k A250M501.WMF 1. Access SP mode 5-803. 2. Select the number that will access the switch or sensor you wish to check (see the table below.
  • Page 168 SERVICE PROGRAM MODE 17 May 1999 Reading Number Description 28 ~ 30 Not used Paper end sensor Paper not detected Paper detected Not used Paper size switch See Table 1 Not used Paper near-end sensor See Table 4 36 ~ 40 Not used Upper paper end sensor Paper not detected Paper detected...
  • Page 169 17 May 1999 SERVICE PROGRAM MODE Reading Number Description Key counter installed Not installed Installed (Optional key counter) 79 ~ 89 Not used DF open sensor (Optional ADF) Closed Opened Feed cover open sensor Closed Opened (Optional ADF) Original set sensor (Optional ADF) Paper not detected Paper detected Registration sensor (Optional ADF)
  • Page 170 SERVICE PROGRAM MODE 17 May 1999 Table 2: Paper Size Switch (Optional Paper Tray Unit) S W N o . 1 A250M002.WMF Number SW 1 SW 2 SW 3 SW 4 SP Value Paper Size — A4 Sideways A4 Lengthwise 11"...
  • Page 171 17 May 1999 SERVICE PROGRAM MODE Table 5: Paper Height Sensor (Optional Paper Tray Unit) Number SP Value Paper Amount 100% 70 ~ 75% 45, 46 Near-end 25 ~ 30% Table 6: Paper Tray Unit Set Sensor Number SP Value Unit Installed None Paper tray unit (1 tray)

  • Page 172: Output Check (Sp5-804)

    SERVICE PROGRAM MODE 17 May 1999 4.2.5 OUTPUT CHECK (SP5-804) [Serviceman P-Mode] Output Check Code: Data: Prev. Next B a c k A250M502.WMF CAUTION: To prevent mechanical or electrical damage, do not keep an electrical component on for a long time. 1.
  • Page 173 17 May 1999 SERVICE PROGRAM MODE Number Description Lower lift motor (Up) (Optional paper tray unit) Upper lift motor (Down) (Optional paper tray unit) Lower lift motor (Down) (Optional paper tray unit) 33 ~ 48 Not used Exit tray LED 1-bin tray LED Polygonal mirror motor Polygonal mirror motor and laser diode...

  • Page 174: Copy Jam History Display (Sp7-903)

    SERVICE PROGRAM MODE 17 May 1999 4.2.6 COPY JAM HISTORY DISPLAY (SP7-903) After entering the SP mode, select “1” and press the “OK” or k key. The LCD panel will display the following message. [Serviceman P-Mode] Jam rev.01 10:09:17:36 F e e d 3 A4 2 Code: 070 J a m B Prev.

  • Page 175: Original Jam History Display (Sp7-905)

    17 May 1999 SERVICE PROGRAM MODE 4.2.7 ORIGINAL JAM HISTORY DISPLAY (SP7-905) After entering the SP mode, select “1” and press the “OK” or k key. The following message is displayed. [Serviceman P-Mode] Jam rev.01 0:06:55:51 Size: A4 2 Code: 210 Org.

  • Page 176: System Parameter And Data Lists (Sp5-992)

    SERVICE PROGRAM MODE 17 May 1999 4.2.8 SYSTEM PARAMETER AND DATA LISTS (SP5-992) 1. Access SP mode 5-902 and select the number corresponding to the list that you wish to print. 2. Press the / (Interrupt) key on the operation panel to access the copy mode display.

  • Page 177: Memory All Clear (Sp5-801)

    17 May 1999 SERVICE PROGRAM MODE 4.2.9 MEMORY ALL CLEAR (SP5-801) NOTE: Memory All Clear mode resets all the settings and counters stored in the NVRAM to the defaults, except for the following: · Electrical total counter value (SP7-003) · Machine serial number (SP5-811) ·...

  • Page 178: Program Upload/Download

    SERVICE PROGRAM MODE 17 May 1999 4.2.10 PROGRAM UPLOAD/DOWNLOAD In this machine, the BICU software is upgraded using a flash memory card. There are two program download procedures. · SP5-826: Uploads from the BICU to a flash memory card. · SP5-827: Downloads from a flash memory card to the BICU. Program Download (SP5-827) A250M211.WMF 1.
  • Page 179 17 May 1999 SERVICE PROGRAM MODE Display during writing [Serviceman P-Mode] Program Download Status: 1-02254 2.08 04/1 11:02 A250M505.WMF Display when the download is complete [Serviceman P-Mode] Program Download Loading completed 04/1 11:02 A250M506.WMF Display if writing failed [Serviceman P-Mode] Program Download Loading error!!! 04/1...
  • Page 180 SERVICE PROGRAM MODE 17 May 1999 Program Upload (SP5-826) A250M211.WMF 1. Turn off the main switch. 2. Remove the cover [A] (1 rivet). 3. Plug the flash memory card [B] into the card slot. NOTE: Make sure that the surface printed “A” faces the left side of the machine (as viewed from the front of the machine).

  • Page 181: Nvram Data Download

    17 May 1999 SERVICE PROGRAM MODE 4.2.11 NVRAM DATA DOWNLOAD After doing the memory all clear procedure, NVRAM data will be reset to their default settings. So it is necessary to upload the NVRAM data before clearing the NVRAM, and to download the NVRAM data afterwards. ·...
  • Page 182 SERVICE PROGRAM MODE 17 May 1999 NVRAM Data Upload (SP5-824) 1. Turn off the main switch. 2. Remove the cover [A] (1 rivet). 3. Plug the flash memory card [B] into the card slot. NOTE: Make sure that the surface printed “A”...

  • Page 183: Aps And Platen/Df Cover Sensor Output Display

    17 May 1999 SERVICE PROGRAM MODE 4.2.12 APS AND PLATEN/DF COVER SENSOR OUTPUT DISPLAY (SP4-301) A250M604.WMF 0 0 0 0 " x 14" 1. Platen cover sensor status 1 = Closed 2. APS sensor status 1 = Paper detected 3. Paper size display 4-55...

  • Page 184: Df Aps Sensor Output Display (Sp6-901)

    SERVICE PROGRAM MODE 17 May 1999 4.2.13 DF APS SENSOR OUTPUT DISPLAY (SP6-901) A250M600.WMF Large Small 0 0 1 0 " x 14" 1. Original set sensor status 1 = Paper detected 2. APS sensor status 1 = Paper detected 3.

  • Page 185: Display Language (Sp5-808)

    17 May 1999 SERVICE PROGRAM MODE 4.2.14 DISPLAY LANGUAGE (SP5-808) Europe Europe Europe Europe US/Asia (standard) (option 1) (option 2) (option 3) NA: English UK: English DE: German FR: French IT: Italian ES: Spanish NL: Dutch SE: Swedish NO: Norwegian DK: Danish FI: Finnish CZ: Czech...

  • Page 186: User Tools

    USER TOOLS 17 May 1999 4.3 USER TOOLS The User Tools are accessed by users and key operators, and by sales and service staff. User Tools are used to input or change the copier’s default settings. 4.3.1 HOW TO ENTER AND EXIT USER TOOLS Press the User Tools button, then select the User Tools program.
  • Page 187 17 May 1999 USER TOOLS Copy Setting Table 1. General Features 1. APS Priority 2. ADS Priority 3. Original Priority 4. Max. Copy Q’ty 5. Set Ratio 6. En. Ratio Priority 7. Re. Ratio Priority 8. Image Adjustment 9. Copy Auto Reset 2.

  • Page 188: Leds

    LEDS 17 May 1999 4.4 LEDS BICU Number Function Monitors the +5 V line for the slave CPU. LED 101 Usually, this LED is blinking. Monitors the +5 V line. LED 102 Usually, this LED is lit. Number Function Monitors the connection between the IOB and the BICU. LED 100 Usually, this LED is blinking.

  • Page 189: Preventive Maintenance Schedule

    17 May, 1999 PM TABLE 5. PREVENTIVE MAINTENANCE SCHEDULE 5.1 PM TABLE NOTE: 1) After carrying out PM, clear the maintenance counter (SP7-909). 2) The amount mentioned as the PM interval indicates the number of prints. Symbol key: C: Clean R: Replace L: Lubricate I: Inspect EM 100k 200k 300k NOTE OPTICS...

  • Page 190: How To Clear The Maintenance Counter

    HOW TO CLEAR THE MAINTENANCE COUNTER 17 May, 1999 EM 100k 200k 300k NOTE Feed belt Clean with water or alcohol. Separation roller Clean with water or alcohol. Pick-up roller Clean with water or alcohol. Stamp Replace if necessary White plate Clean with water or alcohol.

  • Page 191: Replacement And Adjustment

    17 May, 1999 EXTERIOR REMOVAL 6. REPLACEMENT AND ADJUSTMENT 6.1 EXTERIOR REMOVAL A250R112.WMF 6.1.1 REAR COVER 1. Remove the rear cover [A] (5 screws) 6.1.2 COPY TRAY 1. Remove the copy tray [B], as shown (2 screws). NOTE: If a 1-bin sorter is installed, remove it before removing the copy tray. 6.1.3 LEFT COVER 1.

  • Page 192: Front Cover

    EXTERIOR REMOVAL 17 May, 1999 6.1.4 FRONT COVER A250R105.WMF A250R907.WMF 1. Remove the copy tray. (Refer to Copy Tray Removal, section 6.1.2.) 2. Remove the small front cover [A] (1 screw). 3. Remove the front cover [B], as shown.

  • Page 193: Upper Right Cover

    17 May, 1999 EXTERIOR REMOVAL A250R908.WMF 6.1.5 UPPER RIGHT COVER 1. Remove the upper right cover [A] (1 screw). 6.1.6 LOWER RIGHT COVER 1. Remove the upper right cover. 2. Remove the lower right cover [B] (1 screw). 6.1.7 RIGHT SMALL COVER 1.

  • Page 194: Operation Panel

    EXTERIOR REMOVAL 17 May, 1999 6.1.8 OPERATION PANEL A250R123.WMF 1. Remove the operation panel [A] (5 screws and 1 connector).

  • Page 195: Scanner

    17 May, 1999 SCANNER 6.2 SCANNER 6.2.1 EXPOSURE GLASS REMOVAL Platen Cover Model A250R009.WMF 1. Remove the left scale [A] (2 screws). 2. Remove the rear scale [B] (3 screws). 3. Remove the exposure glass [C]. NOTE: When re-installing the exposure glass, place it so that the mark [D] is in the right front position.
  • Page 196 SCANNER 17 May, 1999 ADF Model A250R010.WMF 1. Remove the upper right cover. (See Upper Right Cover Removal, section 6.1.5.) 2. Remove the two screws [A]. 3. Remove the rear scale [B] (3 screws). 4. Remove the exposure glass [C] with left scale. NOTE: When re-installing the exposure glass, make sure that the left scale is inserted into the two pegs [D] on the edge holder.

  • Page 197: Lens Block Removal

    17 May, 1999 SCANNER 6.2.2 LENS BLOCK REMOVAL A250R005.WMF 1. Remove the exposure glass. 2. Remove the lens cover [A] (6 screws). 3. Remove the screw [B] securing the grounding wire, and disconnect the flat cable [C]. 4. Remove the lens block [D] (4 screws).

  • Page 198: Exposure Lamp Replacement

    SCANNER 17 May, 1999 6.2.3 EXPOSURE LAMP REPLACEMENT A250R001.WMF 1. Remove the exposure glass. 2. Remove the platen cover (2 screws) and remove the upper rear cover (2 screws). 3. Remove the operation panel (5 screws and 1 connector). 4. Move the 1st scanner to the opening in the center of the frame. 5.

  • Page 199: 1St Scanner Alignment Adjustment

    17 May, 1999 SCANNER 6.2.4 1ST SCANNER ALIGNMENT ADJUSTMENT A250R008.WMF A250R007.WMF 1. Remove the exposure glass. 2. Remove the platen cover (2 screws) and remove the upper rear cover (2 screws). 3. Remove the operation panel (5 screws and 1 connector). 4.

  • Page 200: 2Nd Scanner Position Adjustment

    SCANNER 17 May, 1999 6.2.5 2ND SCANNER POSITION ADJUSTMENT A250R888.WMF 1. Remove the exposure glass. 2. Remove the platen cover (2 screws) and remove the upper rear cover (2 screws). 3. Remove the operation panel (5 screws and 1 connector). 4.

  • Page 201: Laser Unit

    17 May, 1999 LASER UNIT 6.3 LASER UNIT WARNING Turn off the main power switch and unplug the machine before attempting any of the procedures in this section. Laser beams can seriously damage your eyes. 6.3.1 CAUTION DECAL LOCATIONS Caution decals are located in the laser section as shown below. A250R999.WMF 6-11...

  • Page 202: Laser Unit/Toner Shield Glass Removal

    LASER UNIT 17 May, 1999 6.3.2 LASER UNIT/TONER SHIELD GLASS REMOVAL A250R501.WMF 1. Remove the AIO. 2. Remove the paper exit tray (2 screws). 3. Remove the laser unit [A] (4 screws and 3 connectors). 4. After removing the laser unit, remove the toner shield glass [B]. NOTE: When reinstalling the laser unit, be careful not to damage the actuator of the shutter.

  • Page 203: Ld Unit/Laser Synchronization Detector Removal

    17 May, 1999 LASER UNIT 6.3.3 LD UNIT/LASER SYNCHRONIZATION DETECTOR REMOVAL A250R502.WMF 1. Remove the paper exit tray (2 screws). 2. Remove the laser unit. 3. Remove the LD unit [A] (4 screws and 1 connector). 4. Remove the laser synchronization detector [B] (2 screws and 1 connector). 6.3.4 EXIT TRAY PAPER SENSOR REMOVAL 1.

  • Page 204: Polygonal Mirror Motor Removal

    LASER UNIT 17 May, 1999 6.3.5 POLYGONAL MIRROR MOTOR REMOVAL A250R503.WMF 1. Remove the paper exit tray (2 screws). 2. Remove the laser unit cover [A] (5 screws). 3. Remove the polygonal mirror motor [B] (4 screws and 1 connector). 6-14...

  • Page 205: Laser Unit Alignment Adjustment

    17 May, 1999 LASER UNIT 6.3.6 LASER UNIT ALIGNMENT ADJUSTMENT A250R889.WMF Paper Feed Direction Trim Pattern Moving the lever to the Moving the lever to the front changes the trim rear changes the trim pattern as shown above pattern as shown above A250R890.WMF 1.

  • Page 206: Image Transfer

    IMAGE TRANSFER 17 May, 1999 6.4 IMAGE TRANSFER 6.4.1 TRANSFER ROLLER REMOVAL Preparation 1) Turn off the main switch. 2) Open the right side cover. A250R703.WMF 1. Open the transfer roller cover [A]. 2. Remove the transfer roller [B]. NOTE: Do not touch the transfer roller surface with bare hands. 6-16...

  • Page 207: Fusing

    17 May, 1999 FUSING 6.5 FUSING 6.5.1 FUSING UNIT REMOVAL Preparation 1) Turn off the main switch. 2) Open the right side cover. CAUTION Be careful when removing the fusing unit, because it could be very hot. A250R117.WMF 1. Remove the two screws [A]. 2.

  • Page 208: Hot Roller, Fusing Lamp And Thermofuse Replacement

    FUSING 17 May, 1999 6.5.2 HOT ROLLER, FUSING LAMP AND THERMOFUSE REPLACEMENT Preparation 1) Remove the fusing unit. (Refer to Fusing Unit Replacement, section 6.5.1.) A250R551.WMF 1. Remove the fusing cover [A] (2 screws). 2. Remove the fusing exit sensor [B]. 3.
  • Page 209 17 May, 1999 FUSING A250R553.WMF 5. Disconnect the hot roller stripper pawl springs (see Hot Roller Stripper Pawl Removal, section 6.5.5.) 6. Remove the hot roller grounding terminal [D] (1 screw). 7. Remove the two screws securing the fusing lamp terminals [E]. 8.

  • Page 210: Pressure Roller Replacement

    FUSING 17 May, 1999 6.5.3 PRESSURE ROLLER REPLACEMENT Preparation 1) Remove the fusing unit and separate the fusing unit. (Refer to Hot Roller, Fusing Lamp and Thermofuse Replacement, section 6.5.2.) A250R505.WMF A250R552.WMF A250R506.WMF 1. Remove the paper entrance guide [A]. 2.

  • Page 211: Fusing Thermistor Replacement

    17 May, 1999 FUSING 6.5.4 FUSING THERMISTOR REPLACEMENT Preparation 1) Remove the hot roller. (Refer to Hot Roller and Fusing Lamp and Thermofuse Replacement, section 6.5.2.) A250R504.WMF 1. Remove the thermofuse [A]. 2. Remove the cable cover (1 screw) [B]. NOTE: When reinstalling the cable cover, secure the cable under the cover correctly.

  • Page 212: Hot Roller Stripper Pawl Replacement

    FUSING 17 May, 1999 6.5.5 HOT ROLLER STRIPPER PAWL REPLACEMENT Preparation 1) Remove the fusing unit and separate the fusing unit. (Refer to Hot Roller, Fusing Lamp and Thermofuse Replacement, section 6.5.2.) A250R507.WMF 1. Disconnect the hot roller stripper pawl springs [A] (5 springs). 2.

  • Page 213: Paper Feed

    17 May, 1999 PAPER FEED 6.6 PAPER FEED 6.6.1 PAPER FEED ROLLER REPLACEMENT Preparation 1) Remove the fusing unit. (Refer to Fusing Unit Replacement, section 6.5.1.) 2) Remove the AIO. A250R706.WMF 1. Draw out the first paper cassette. 2. Remove the center paper feed roller guide [A]. 3.

  • Page 214: Friction Pad Replacement

    PAPER FEED 17 May, 1999 6.6.2 FRICTION PAD REPLACEMENT A250R701.WMF 1. Draw out the paper cassette. 2. While unhooking the hooks [A], remove the friction pad [B], as shown. NOTE: Be sure to unhook the hooks or they may break. 6-24...

  • Page 215: Standard Tray Paper Feed Clutch Replacement

    17 May, 1999 PAPER FEED 6.6.3 STANDARD TRAY PAPER FEED CLUTCH REPLACEMENT Preparation 1) Remove the rear cover. (Refer to Rear Cover Removal, section 6.1.1.) 2) Remove the main motor and gear box. (Refer to Main Motor/Gear Box Replacement, section 6.7.1.) 3) Remove the AIO.

  • Page 216: Vertical Transport Roller/Sensor/Clutch Replacement

    PAPER FEED 17 May, 1999 6.6.4 VERTICAL TRANSPORT ROLLER/SENSOR/CLUTCH REPLACEMENT A250R708.WMF A250R709.WMF 1. Remove the rear right cover. 2. Replace the vertical transport clutch [A] (1 snap ring). 3. Open the vertical transport cover and remove the pin [B]. 4. Remove the vertical transport guide [C] (2 screws). 5.

  • Page 217: By-Pass Feed Roller Replacement

    17 May, 1999 PAPER FEED 6.6.5 BY-PASS FEED ROLLER REPLACEMENT A250R705.WMF A250R704.WMF 1. Remove the rear right cover. 2. Remove the AIO cartridge and the fusing unit. 3. Release the by-pass feed sensor feeler [A] by pushing the left side of the feeler shaft, as shown.

  • Page 218: By-Pass Feed Friction Pad Replacement

    PAPER FEED 17 May, 1999 6.6.6 BY-PASS FEED FRICTION PAD REPLACEMENT Preparation 1) Remove the by-pass feed roller. (Refer to By-pass Feed Roller Removal, section 6.6.5.) A250R714.WMF 1. While unhooking the hooks [A], remove the friction pad [B], as shown. NOTE: Be sure to unhook the hooks or they may break.

  • Page 219: By-Pass Feed Sensor Replacement

    17 May, 1999 PAPER FEED 6.6.7 BY-PASS FEED SENSOR REPLACEMENT A250R711.WMF 1. Remove the rear right cover. 2. Replace the by-pass feed sensor [A], as shown. 6-29...

  • Page 220: By-Pass Tray Removal

    PAPER FEED 17 May, 1999 6.6.8 BY-PASS TRAY REMOVAL A250R715.WMF A250R716.WMF 1. Open the vertical transport cover and remove the pin [A]. 2. Remove the front right cover [B] (1 screw). 3. Disconnect the by-pass tray sensor connector [C]. 4. While lifting the hook [D] upward, lower the by-pass tray and remove it as shown.

  • Page 221: By-Pass Feed Paper Width Sensor Removal

    17 May, 1999 PAPER FEED 6.6.9 BY-PASS FEED PAPER WIDTH SENSOR REMOVAL Preparation 1) Remove the by-pass tray (Refer to By-pass Tray Removal, section 6.6.8.). A250R717.WMF A250R718.WMF 1. Remove the tray lever [A] (1 snap ring and 1 pin). 2. Remove the upper by-pass tray [B] (1 mylar and 2 hooks). 3.

  • Page 222: Registration Roller Removal

    PAPER FEED 17 May, 1999 6.6.10 REGISTRATION ROLLER REMOVAL Preparation 1) Remove the by-pass paper feed roller cover. (Refer to By-pass Paper Feed Roller Removal, section 6.6.5.) 2) Remove the rear cover. (Refer to Exterior Removal, section 6.1.) 3) Remove the main motor and gearbox. (Refer to Main Motor and Gearbox Removal, section 6.7.) A250R712.WMF 1.

  • Page 223: Registration Sensor Replacement

    17 May, 1999 PAPER FEED 6.6.11 REGISTRATION SENSOR REPLACEMENT Preparation 1) Remove the gearbox. (Refer to Main Motor and Gearbox Removal, section 6.7.) A250R713.WMF 1. Remove the registration sensor connector. 2. Replace the registration sensor [A], as shown. 6-33...

  • Page 224: Toner End Sensor Replacement

    PAPER FEED 17 May, 1999 6.6.12 TONER END SENSOR REPLACEMENT Preparation 1) Remove the AIO cartridge. A250R702.WMF 1. Replace the toner end sensor [A], as shown (1 connector). 6-34...

  • Page 225: Others

    17 May, 1999 OTHERS 6.7 OTHERS 6.7.1 MAIN MOTOR/GEAR BOX REPLACEMENT Preparation 1) Remove the rear cover. 2) Remove the by-pass feed roller (refer to By-pass Feed Roller Replacement, section 6-6-5). A250R901.WMF 1. Remove the flywheel [A] (3 screws). 2. Remove the registration roller clutch [B]. 3.

  • Page 226: Iob (Input Output Board) Replacement

    OTHERS 17 May, 1999 6.7.2 IOB (INPUT OUTPUT BOARD) REPLACEMENT Preparation 1) Remove the rear cover. A250R906.WMF 1. Replace the input output board [A] (4 screws and all connectors). 6-36...

  • Page 227: Bicu (Base-Engine Image Control Unit) Replacement

    17 May, 1999 OTHERS 6.7.3 BICU (BASE-ENGINE IMAGE CONTROL UNIT) REPLACEMENT Preparation 1) Remove the left cover. A250R905.WMF 1. Remove the base-engine image control unit [A] (6 screws and all connectors). 2. Re-install the NVRAM from the old board in the socket on the new board. 6-37...

  • Page 228: Power Supply Unit And B/C/T Power Pack Replacement

    OTHERS 17 May, 1999 6.7.4 POWER SUPPLY UNIT AND B/C/T POWER PACK REPLACEMENT Preparation 1) Remove the left cover. A250R904.WMF A250R903.WMF A250R902.WMF 1. Remove the exit tray [A] (2 screws). 2. Remove the front cover [B]. 3. Remove all connectors. 4.

  • Page 229: Standard White Density Adjustment

    17 May, 1999 STANDARD WHITE DENSITY ADJUSTMENT 6.8 STANDARD WHITE DENSITY ADJUSTMENT This is to adjust the standard white density level. Perform this adjustment in any of the following conditions: · After replacing the standard white plate. · After replacing the NVRAM on the BICU. (If only the BICU is replaced, this adjustment is not necessary, as long as the NVRAM from the old BICU is put on the new BICU.) ·...

  • Page 230: Copy Adjustment Printing/Scanning

    COPY ADJUSTMENT PRINTING/SCANNING 17 May, 1999 6.9 COPY ADJUSTMENT PRINTING/SCANNING NOTE: 1) You need to perform these adjustment(s) after replacing any of the following parts: · Scanner · Lens Block/SBU Assembly · Scanner Drive Motor · Polygon Mirror Motor · Paper Trays ·...
  • Page 231 17 May, 1999 COPY ADJUSTMENT PRINTING/SCANNING Blank Margin NOTE: If the leading edge/side-to-side registration cannot be adjusted within the specifications, adjust the blank margin for the leading/left side edge. 1. Check the trailing edge and blank margin for the right side edge. Adjust them using the following SP modes.

  • Page 232: Scanning

    COPY ADJUSTMENT PRINTING/SCANNING 17 May, 1999 6.9.2 SCANNING NOTE: 1) Before doing the following scanner adjustments, check and adjust the printing registration/side-to-side adjustment and the blank margin adjustment, 2) Use an OS-A3 test chart to perform the following adjustments. Registration: Platen Mode 1.
  • Page 233 17 May, 1999 COPY ADJUSTMENT PRINTING/SCANNING Magnification NOTE: Use an OS-A3 test chart to perform the following adjustment. A: Main scan magnification B: Sub-scan magnification A250R517.WMF Main Scan Magnification 1. Place the test chart on the exposure glass and make a copy from one of the feed stations.

  • Page 234: Adf Image Adjustment

    COPY ADJUSTMENT PRINTING/SCANNING 17 May, 1999 6.9.3 ADF IMAGE ADJUSTMENT Registration and Blank Margin A: Leading edge registration B: Side-to-side registration A250R516.WMF A250R515.WMF NOTE: Make a temporary test chart as shown above using A3/11" x 17" paper. 1. Place the temporary test chart on the ADF and make a copy from one of the feed stations.
  • Page 235 17 May, 1999 SERVICE CALL CONDITIONS 7. TROUBLESHOOTING 7.1 SERVICE CALL CONDITIONS 7.1.1 SUMMARY There are 4 levels of service call conditions Level Definition Reset Procedure To prevent the machine from being Enter SP mode, then turn the main damaged, the SC can only be reset by a power switch off and on.
  • Page 236 SERVICE CALL CONDITIONS 17 May, 1999 7.1.2 SC CODE DESCRIPTIONS SC101: Exposure Lamp Error Definition: [B] The standard white level was not detected properly when scanning the white plate. Possible Causes: · Exposure lamp defective · Lamp stabilizer defective · Exposure lamp connector defective ·...
  • Page 237 17 May, 1999 SERVICE CALL CONDITIONS SC122: Scanner Home Position Error 3 Definition: [B] The scanner home position sensor detects the on condition while the scanner returns to the home position. Possible Causes: · Scanner home position sensor defective · Scanner drive motor defective ·...
  • Page 238 SERVICE CALL CONDITIONS 17 May, 1999 SC302: Charge Roller Current Leak Definition: [B] A current leak signal for the charge roller is detected. Possible Causes: · Charge roller damaged · Power pack-B/C/T · Poor connection of the OPC drum in the all-in-one cartridge SC320: Polygonal Mirror Motor Error Definition: [B] The lock signal for the polygon mirror motor is not detected within 4 seconds...
  • Page 239 17 May, 1999 SERVICE CALL CONDITIONS SC324: LD Drive Current Over Definition: [B] The LD drive board applies more than 100 mA to the LD. Possible Causes: · LD unit defective (not enough power, due to aging) · Poor connection of the cable between the LD unit and the BICU board ·...
  • Page 240 SERVICE CALL CONDITIONS 17 May, 1999 SC502: 2nd Tray Lift Malfunction SC503: 3rd Tray Lift Malfunction Definition: [C] The paper lift sensor is not activated after the tray lift motor has been on for 13 seconds. Possible Causes: · Tray upper lift sensor defective ·...
  • Page 241 17 May, 1999 SERVICE CALL CONDITIONS SC544: Fusing Low Temperature Error Definition: [A] A fusing temperature of less than 100°C is detected for 1 second by the fusing thermistor. Possible Causes: · Fusing thermistor defective · Power supply unit defective SC546: Unstable Fusing Temperature Definition: [A] The fusing temperature does not rise 3°C or more within 5 seconds after the...
  • Page 242 SERVICE CALL CONDITIONS 17 May, 1999 SC691: Communication Error between BICU and Fax Controller Unit Definition: [B] The BICU board cannot communicate with the fax control unit properly. Possible Causes: · The cable between the BICU board and the fax control unit has a poor connection ·...
  • Page 243 17 May, 1999 SERVICE CALL CONDITIONS SC901: Mechanical Total Counter Definition: [B] The mechanical total counter is not working properly. Possible Causes: · Mechanical total counter defective · Input/output board defective · Disconnected mechanical total counter SC921: MSU Hardware Error Definition: [B] The hardware of the MSU is defective.
  • Page 244 BLOWN FUSE TABLE 17 May, 1999 7.2 BLOWN FUSE TABLE Rating Fuse Symptom when tuning on the main switch 115 V 220 ~ 240 V 15 A/250 V — No response. 8 A/125 V 3.15 A/250 V No response. Normal operation. But optional heater is not 3.15 A/125 V 3.15 A/250 V working (when turning off the main switch).
  • Page 245 17 May, 1999 ELECTRICAL COMPONENT DEFECTS 7.3.2 SENSORS Symbol Description CN No. Condition Symptom Scanner HP Open SC194 is displayed. 327-8 Short SC120 is displayed. Original Width 320-8, 9 The CPU cannot detect proper original Open size. Original Length 1 320-3, 4 Short Original Length 2...
  • Page 246 ELECTRICAL COMPONENT LAYOUT (A250/A859/A860/A861/A869) - A250 - - A250 - - A860 - - A859 - A860S102.WMF A250S153.WMF A859S102.WMF - A859 - - A250 - - A860 - A250S152.WMF Symbol Index No. Description P to P Symbol Index No. Description P to P Symbol Index No.
  • Page 247 1-Bin Tray (A869) A250 Point to Point Diagram Junction Bin Tray Gate Paper Exit Switch Tray Motor Sensor Solenoid Sensor Registration Key Counter Registration Sensor Exit Tray LED Vertical By-pass Clutch Right Right Paper Paper By-pass By-pass Vertical Exit Tray Paper Vertical Platen...

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