1. Manuals
  2. Brands
  3. Ricoh Manuals
  4. All in One Printer
  5. K-C3
  6. Service manual

Ricoh K-C3 Service Manual

Machine code b245/b268/b269/b276/b277
Hide thumbs Also See for K-C3:
Table of Contents

Advertisement

Quick Links

See also: Service Manual
Model K-C3
Machine Code:
(B245/B276/B277/B268/B269)

SERVICE MANUAL

©Ricoh Company, Ltd.
January 18th, 2006
Subject to change

Advertisement

Table of Contents
loading

Related Manuals for Ricoh K-C3

Summary of Contents for Ricoh K-C3

  • Page 1: Service Manual

    Model K-C3 Machine Code: (B245/B276/B277/B268/B269) SERVICE MANUAL ©Ricoh Company, Ltd. January 18th, 2006 Subject to change...

  • Page 2: Table Of Contents

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Table of Contents Table of Contents........................i Read This First ........................1 Safety Notices and Symbols & Abbreviations..............1 Important Safety Notices ................... 1 Laser Safety ........................2 Symbols and Abbreviations ....................2 Installation..........................3 Installation Requirements....................3 Environment ........................3 Machine Level .......................
  • Page 3 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Anti-condensation Heater Installation................31 Tray Heaters ........................32 Upper Tray Heater ....................... 32 Lower Tray Heater (Two-tray Model Only) ..............34 Tray Heaters For The Optional Paper Feed Units ............35 Key Counter Installation ....................39 GDI Expansion ........................ 42 Accessory Check......................
  • Page 4 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Scanner Unit ........................59 Exposure Glass/DF Exposure Glass ................59 Lens Block ........................59 Lamp Stabilizer Board And Exposure Lamp ..............61 Original Width/Length Sensor..................61 Scanner Motor ......................63 Scanner Home Position Sensor................... 64 Adjusting Scanner Positions ..................65 Laser Unit........................
  • Page 5 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Relay Sensor ....................... 90 Lower Paper Feed Clutch (Two-tray Models Only) ............90 Vertical Transport Sensor (Two-tray Models Only) ............91 Paper Size Switch ....................... 91 Image Transfer ........................ 92 Image Transfer Roller ....................92 Image Density Sensor ....................93 Fusing ..........................
  • Page 6 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 ADF Image Adjustment....................115 Troubleshooting ........................ 117 Service Call Conditions ....................117 Summary ........................117 SC Code Descriptions ....................117 Electrical Component Defects ..................128 Sensors ........................128 Switches ........................129 Blown Fuse Conditions ....................131 LED Display ........................
  • Page 7 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Original Jam History Display (SP 7508)..............173 ADF APS Sensor Output Display (SP 6901).............. 174 Detailed Section Descriptions ................... 175 Overview ........................175 Component Layout ....................175 Paper Path......................... 176 Drive Layout ......................177 Board Structure ......................178 Block Diagram ......................
  • Page 8 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Developer Mixing....................... 209 Development Bias ..................... 210 Toner Supply......................211 Toner Supply Mechanism ..................212 Toner Density Control ....................212 Toner Supply in Abnormal Sensor Conditions............216 Toner Near End/End Detection and Recovery ............216 Drum Cleaning and Toner Recycling ................218 Drum Cleaning......................
  • Page 9 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Energy Saver Modes of Basic Machines............... 242 Overview........................242 AOF ........................... 243 Timers........................243 Recovery ........................243 Energy Saver Modes of GDI Machines ................. 244 Overview........................244 AOF ........................... 245 Timers........................245 Recovery ........................245 Specifications........................246 General Specifications ....................

  • Page 10: Read This First

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Read This First Safety Notices and Symbols & Abbreviations Important Safety Notices Prevention of Physical Injury Before disassembling or assembling parts of the copier and peripherals, make sure that the power cord is unplugged. The wall outlet should be near the copier and easily accessible. 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 11: Laser Safety

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Laser Safety The Center for Devices and Radiological Health (CDRH) prohibits the repair of laser-based optical units in the field. The optical housing unit can only be repaired in a factory or at a location with the requisite equipment. The laser subsystem is replaceable in the field by a qualified Customer Engineer.

  • Page 12: Installation

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Installation Installation Requirements Before installing options, please do the following: If there is a printer option in the machine, print out all data in the printer buffer. Turn off the main switch and disconnect the power cord, the telephone line, and the network cable.

  • Page 13: Machine Level

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Machine Level Front to back: Within 5 mm (0.2") of level Right to left: Within 5 mm (0.2") of level Minimum Space Requirements Place the copier near the power source, providing clearance as shown: A (front): 750 mm (30") B (left): 150 mm (6") C (rear): 50 mm (2") D (right): 250 mm (10")

  • Page 14: Copier Installation

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Copier Installation Power Sockets for Peripherals Make sure to plug the cables into the correct sockets. [A]: Socket for ADF/ARDF (Rated voltage output max. DC24 V) [B]: Socket for paper tray unit (Rated voltage output max. DC24 V) Accessory Check Check that you have the accessories in this list.

  • Page 15: Installation Procedure

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Description Q’ty Printer/Scanner Reference (-19, -29) Network Reference (-19, -29) Quick Guide Copy Edition (-19, -29) 10 Quick Guide Printer/Scanner Edition (-19, -29) 11 Manual for this machine (-19, -29) 12 Safety Information (-19, -29) Installation Procedure Unplug the machine power cord before starting the following procedure.
  • Page 16 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Open the right door [B], and remove the PCU (photoconductor unit) [C]. Separate the PCU into the upper part and the lower part ( x 5). Put a sheet of paper on a level surface and place the upper part on it. This prevents foreign material from getting on the sleeve rollers...
  • Page 17 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Distribute a pack of developer [D] to all openings equally. Do not spill the developer on the gears [E]. If you have spilled it, remove the developer by using a magnet or magnetized screwdriver. Do not turn the gear [E] too much. The developer may spill. Reassemble the PCU and reinstall it.
  • Page 18 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 11. Pull out the paper tray [I] and turn the paper size dial to the appropriate size. Adjust the positions of the end and side guides. To move the side guides, release the green lock on the rear side guide. 12.

  • Page 19: Platen Cover Installation

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Platen Cover Installation Accessory Check Check that you have the accessories indicated below. Description Q’ty Stepped Screw Installation Procedure Unplug the machine power cord before starting the following procedure. Install the platen cover ( x 2).

  • Page 20: Ardf Installation

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 ARDF Installation Accessory Check Check the quantity and condition of the accessories against the following list. Description Q’ty Scale Guide DF Exposure Glass Stud Screw Knob Screw Original Size Decal Screwdriver Tool Attention Decal—Top Cover Stamp Cartridge Installation Procedure...

  • Page 21: Installation Procedure

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Installation Procedure Unplug the copier power cord before starting the following procedure. Remove the strips of tape. Remove the left scale [A] ( x 2). Place the DF exposure glass [B] on the glass holder. Make sure that the white mark [C] is on the bottom at the front end.
  • Page 22 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Secure the ARDF unit with the knob screws [G]. Connect the cable [H] to the copier. Attach the appropriate original size decal [I] as shown. 10. Attach an attention decal to the top cover. The attention decals in the package are written in different languages.
  • Page 23 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 11. Open the ARDF [J]. 12. Install the stamp cartridge [K] to the ARDF. 13. Make a full size copy, and check that the side-to-side and leading edge registrations are correct. If they are not, adjust the side-to-side and leading edge registrations.

  • Page 24: Adf Installation

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 ADF Installation Accessory Check Check the quantity and condition of the accessories against the following list. Description Q’ty Scale Guide DF Exposure Glass Stud Screw Fixing Screw Original Size Decal Screwdriver Tool Attention Decal—Top Cover Stamp Cartridge Installation Procedure...

  • Page 25: Installation Procedure

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Installation Procedure Unplug the machine power cord before starting the following procedure. Remove the strips of tape. Remove the left scale [A] ( x 2). Place the DF exposure glass [B] on the glass holder. Make sure that the white mark [C] is on the bottom at the front end.
  • Page 26 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Secure the ADF unit with the fixing screws [G]. Connect the cable [H] to the copier. Attach the appropriate scale decal [I] as shown. 10. Attach an attention decal to the top cover. The attention decals in the package are written in different languages.
  • Page 27 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 11. Open the ADF [J]. 12. Install the stamp cartridge [K] to the ADF 13. Turn the main power switch on. Then check if the document feeder works properly. 14. Make a full size copy, and check that the side-to-side and leading edge registrations are correct.

  • Page 28: Two-Tray Paper Tray Unit Installation

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Two-tray Paper Tray Unit Installation Accessory Check Check the quantity and condition of the accessories against the following list. Description Q’ty Screw – M4x10 Unit Holder 2 x 2 pieces Adjuster Unit Holder Installation Procedure If the optional printer unit is installed: Print out all data in the printer buffer.
  • Page 29 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 After removing the tape that secures the peripheral components and cardboard to the paper tray, make sure that there is no tape and/or tape reside remaining on the tray. Attach the adjuster [A] to the base plate as shown. This step is not necessary if a cabinet is installed.
  • Page 30 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Set the copier on the paper tray unit. Before placing the copier on the paper tray unit, make sure that the harness [C] is safe. The paper tray unit does not function properly if the harness is damaged.
  • Page 31 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Install the two brackets [F] ( x 1 (each)) Connect the connecting harness [G] to the copier. There are cutouts for the plugs on both sides. The left side has one cutout, and the right side has two. 10.
  • Page 32 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 12. Rotate the adjuster (installed at step 2) to fix the machine in place. If a cabinet is installed, this step is unnecessary. 13. Load the paper in the paper trays and make full size copies from each tray. Check if the side-to-side and leading edge registrations are correct.

  • Page 33: One-Tray Paper Tray Unit Installation

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 One-tray Paper Tray Unit Installation Accessory Check Check the quantity and condition of the accessories against the following list. Description Q’ty Screw – M4 x 10 Stepped Screw – M4 x 10 Unit Holder Installation Procedure If the optional printer unit is installed: Print out all data in the printer buffer.
  • Page 34 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Remove the cover [A] (1 rivet). Before placing the copier on the paper tray unit, make sure that the harness [B] is safe. The paper tray unit does not function properly if the harness is damaged. Set the copier on the paper tray unit.
  • Page 35 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 One-tray copier model (B268/B276): Remove the 1st tray cassette [C]. Two-tray copier models (B269/B277): Remove the 2nd tray cassette [C]. Install the two screws [D]. Reinstall the tray cassette.
  • Page 36 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Install the two brackets [E]. (1 stepped screw each). Connect the connecting harness [F] to the copier. There are cutouts for the plugs on both sides. The left side has one cutout, and the right side has two. Reinstall the cover removed in step 2.

  • Page 37: One-Bin Tray Installation

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 One-Bin Tray Installation Accessory Check Check the quantity and condition of the accessories. Description Q’ty Installation procedure One-bin sorter Exit tray Tapping screw M3 x 6 Installation Procedure Unplug the machine power cord before starting the following procedure. Remove the inverter tray [A].
  • Page 38 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Open the front cover [D]. Remove the front right cover [E] ( x 1). Disconnect the connector [F]. Cut the front cover as shown, to make an opening [G] for the 1-bin tray. Install the 1-bin tray [H]. Make sure the connectors [I] are connected firmly.
  • Page 39 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 12. Reattach the front right cover [K]. 13. Close the front cover [L]. 14. Install the exit tray [M] as follows: Keep the front end higher than the rear end. Push the left hook into the opening in the copier. Push the right hook into the opening in the copier.

  • Page 40: Anti-Condensation Heater Installation

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Anti-condensation Heater Installation Unplug the machine power cord before starting the following procedure. Remove the exposure glass. Remove the left cover. Pass the connector [A] through the opening [B]. Install the anti-condensation heater [C], as shown. Join the connectors [A, D].

  • Page 41: Tray Heaters

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Tray Heaters Unplug the machine power cord before starting the following procedure. Upper Tray Heater Remove the 1st tray cassette [A]. Remove the rear cover. Pass the connector [B] through the opening [C] and install the tray heater [D] ( x 1).
  • Page 42 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Install the relay harness [E]. Fix the harness with the clamp [F]. Reinstall the 1st tray cassette and the rear cover.

  • Page 43: Lower Tray Heater (Two-Tray Model Only)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Lower Tray Heater (Two-tray Model Only) Remove the 2nd tray cassette [A]. Remove the rear lower cover. B277/B269 only: Remove the DCB [B] with bracket ( x 4, x 3). Pass the connector [C] through the opening [D] and install the tray heater [E] ( x 1).

  • Page 44: Tray Heaters For The Optional Paper Feed Units

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Tray Heaters For The Optional Paper Feed Units Remove the rear cover [A].for the paper tray unit One-tray paper feed unit: Two-tray paper feed unit: Two-tray unit only: Remove the cable guide [B]. Install the clamps [C].
  • Page 45 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 One-tray paper feed unit: Two-tray paper feed unit: Pass the connector [D] through the opening [E]. Install the tray heater [F] ( x 1)
  • Page 46 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 One-tray paper feed unit: Two-tray paper feed unit: Clamp the cables [G], as shown. Join the connectors [H]. Two-tray unit only: Reinstall the cable guide. One-tray copier model (B268/B276): Remove the 1st tray cassette. Two-tray copier models (B269/B277): Remove the 2nd tray cassette.
  • Page 47 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 10. Remove the two screws [I] and install the two hexagonal socket screws [J]. 11. Reinstall the 1st tray/2nd tray(s) and rear cover.

  • Page 48: Key Counter Installation

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Key Counter Installation Unplug the machine power cord before starting the following procedure. Remove the left cover. Remove the rear cover. Cut the cap [A] with nippers. Punch out the small hole [B] using a screwdriver. Hold the key counter plate nuts [C] on the inside of the key counter bracket [D] and insert the key counter holder [E].
  • Page 49 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Connect the connector [G] to CN126 on the BICU. Hold the harness with the clamps [H][I][J]. The relay harness is not included in the key counter bracket accessories 10. Join the relay harness [K] with the connector [L]. 11.
  • Page 50 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 12. Pass the relay harness through the opening [M] and reinstall the left cover. 13. Install the stepped screw [N]. 14. Join the connectors [O]. 15. Pass the joined connectors through the opening of the key counter holder assembly [P], and put the connectors inside the assembly.

  • Page 51: Gdi Expansion

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 GDI Expansion Accessory Check Description Q’ty Cover-CPS NA Cover-CPS EU Ferrite Core (B866 only) Tapping Screw-M3X6 Sheet-EULA Seal-Caution Installation Procedure Installing Expansion Component Unplug the machine power cord before starting the following procedure. Remove the rear cover [A] ( x 6).
  • Page 52 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Connect the controller box [D] to the BICU. Make sure that the BICU [E] is not damaged and that the three openings [F][G][H] hold the controller box. Fasten the screws ( x 7). Attach the ferrite core [I] to the network cable [J]. The end of the ferrite core must be about 10 cm (4") from the end of the cable [K].

  • Page 53: Installing Panels And Keys

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Installing Panels and Keys Remove the dummy cover [A] from the operation panel Install the printer/scanner panel [B] on the operation panel.

  • Page 54: Preventive Maintenance

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Preventive Maintenance PM Tables After preventive maintenance work, reset the PM counter (SP 7804 1). PM intervals (60k, 80k, and 120K) indicate the number of prints. Key: AN: As necessary C: Clean R: Replace L: Lubricate I: Inspect Optics 120k NOTE...
  • Page 55 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 120k NOTE Paper feed guides Clean with water or alcohol. Paper-dust Mylar Clean with water or alcohol. Fusing Unit 120k NOTE Hot roller Pressure roller Pressure roller cleaning roller Hot roller bushings Pressure-roller bushing Hot roller stripper pawls Dry cloth Thermistor Dry cloth...

  • Page 56: How To Reset The Pm Counter

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 How to Reset the PM Counter After preventive maintenance work, reset the PM counter (SP 7804 1) as follows. Activate the SP mode ( p.133). Select SP 7804 1 (Reset–PM Counter). Press the OK key [A]. The message "Execute" shows. Press the button [B] below the message "Execute."...
  • Page 57 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 To reset the PM counter, press the button [C] below the message "Execute." Wait until the message "Completed" shows. Quit the SP mode.

  • Page 58: Replacement And Adjustment

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Replacement and Adjustment General Cautions Do not turn off the main switch while any of the electrical components are active. Doing so may result in damage to units (such as the PCU) as they are pulled out or replaced. PCU (Photoconductor Unit) The PCU consists of the OPC drum, charge roller, development unit, and cleaning components.

  • Page 59: Laser Unit

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Laser Unit Do not loosen or adjust the screws securing the LD drive board on the LD unit. This will put the LD unit out of adjustment. Do not adjust the variable resistors on the LD unit. These are adjusted at the factory.

  • Page 60: Special Tools And Lubricants

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Special Tools and Lubricants Part Number Description Q’ty A0069104 Scanner Positioning Pins (4 pins/set) 1 set A2929500 Test Chart S5S (10 pcs/set) 1 set VSSM9000 FLUKE 87 Digital Multimeter N8036701 4MB Flash Memory Card A2579300 Grease Barrierta S552R 52039502 Grease G-501...

  • Page 61: Exterior Covers & Operation Panel

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Exterior Covers & Operation Panel Rear Cover Unplug the DF cable [A] (if installed). Rear cover [B] ( x 6) Rear Lower Cover (Two-tray Models Only) Rear cover (see above) or tray harness cover [A] (1 rivet). Rear lower cover [B] ( x 2)

  • Page 62: Copy Tray

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Copy Tray Copy tray [A] ( x 2) Upper Covers Platen Cover, ARDF, or ADF (if installed) Rear cover Left upper cover [A] ( x 2) Front upper left cover [B] ( x 3) Operation panel [C] ( x 4, x 1) Right upper cover [D] (...

  • Page 63: Left Cover

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Left Cover Left cover [A] ( x 3) Front Cover Pull out the (top) paper tray. Open the front door [A]. Front cover [B] ( x 4)

  • Page 64: Front Right Cover

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Front Right Cover Open the front door [A]. Front right cover [B] ( x 1) Right Rear Cover Right upper cover ( p.53) Open the duplex unit (B269/B277 only). Right rear cover [A] ( x 1)

  • Page 65: Right Door (Duplex Unit (B269/B277))

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Right Door (Duplex Unit (B269/B277)) Right rear cover (see above) Open the right door [A]. Open the clamps [B] and disconnect the two connectors [C] or three connectors (B269/B277). Right door By-pass Tray Right rear cover (above) Open the right door.

  • Page 66: Left Lower Cover (Two-Tray Models Only)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 procedure) and disconnect the connector (5-pin connector with colored wires). Cable holder [A] (B269/B277 only) Front-side clip ring [B] Front-side pin [C] (You can push the pin from behind the right door.) Front-side tray holder arm [D] Remove the rear-side clip ring, pin, and tray holder arm in the same manner.

  • Page 67: Platen Cover Sensor

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Platen Cover Sensor Top rear cover Platen cover sensor [A] ( x 1)

  • Page 68: Scanner Unit

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Scanner Unit Exposure Glass/DF Exposure Glass - Exposure Glass - Front upper left cover ( p.53) Left scale [A] ( x 2) Rear scale [B] ( x 3) Exposure glass [C] Make sure that the mark is at the rear left corner, and that the left edge is aligned to the support on the frame when you reinstall the exposure glass.
  • Page 69 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 lens assembly may slide out of position. Exposure glass ( p.59) Lens cover [A] ( x 5) Disconnect the flat cable [B]. Lens block [C] ( x 4). Adjust the image quality ( p.111) after you install a new lens block.

  • Page 70: Lamp Stabilizer Board And Exposure Lamp

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Lamp Stabilizer Board And Exposure Lamp Operation panel ( p.53) Exposure glass ( p.59) Slide the first scanner to a position where the front end of the lamp is visible. Place one hand under the lamp stabilizer board [A] and release the hook [B]. Lamp stabilizer board ( x 2) Press the plastic latch [C] and push the front end of the lamp toward the rear.
  • Page 71 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 - Sensor Positions - Sensor positions vary according to regions as shown below. - Sensor Positions for China Model (8K/16K) - This procedure is for China models only. You must rearrange the positions of the original width and length sensors for the copier to detect the following original sizes: 8K SEF (270 x 390 mm) 16K SEF (195 x 270 mm)

  • Page 72: Scanner Motor

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 16K-LEF). Turn off the main switch. Exposure glass ( p.59). Original width/length sensors [A] [B] Rearrange the sensor positions [C] [D]. Turn on the main switch and check the operations. Scanner Motor Left upper cover, front upper left cover, operation panel, top rear cover ( p.53) Exposure glass ( p.59)

  • Page 73: Scanner Home Position Sensor

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Scanner Home Position Sensor Left upper cover, top rear cover ( p.53) Exposure glass, DF exposure glass (if installed) ( p.59 Disconnect the connector [A]. Scanner left lid [B] ( x 7) Sensor tape [C]. Scanner home position sensor [D]...

  • Page 74: Adjusting Scanner Positions

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Adjusting Scanner Positions Grasp the front and rear ends (not the middle) of the first scanner when you manually move it. The first scanner may be damaged if you press, push, or pull its middle part. - Overview - Adjust the scanner positions when the first scanner [C] and second scanner [B] are not parallel with the side frames [A], or, when you have replaced one or more of the scanner...
  • Page 75 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 The alignment marks [G] [I] on the frames The scanner positions are correct when these holes and marks are aligned. - Adjusting the First Scanner Contact Points - A(R)DF or platen cover Operation panel, top rear cover ( p.53).
  • Page 76 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 - Adjusting the Second Scanner Contact Points - A(R)DF or platen cover Operation panel, top rear cover ( p.53). Exposure glass ( p.59) Rear exhaust fan [A] ( x 2) Controller bracket [B] ( x 3) Disconnect the platen-cover-sensor connector [C].
  • Page 77 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 11. The adjustment holes in the first scanner 12. The adjustment holes in the second scanner 13. The alignment marks on the frames 14. Insert the positioning tools [G] [H] through the holes and marks. 15. Check that the scanner belts are properly set in the brackets. 16.

  • Page 78: Laser Unit

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Laser Unit The laser beam can seriously damage your eyes. Be absolutely sure that the main power switch is off and that the machine is unplugged before you access the laser unit. Location Of Caution Decal Toner Shield Glass Open the front door.

  • Page 79: Laser Unit

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Press the toner shield glass cover [B] to the left and pull it out. Pull out the toner shield glass [C]. Laser Unit Toner shield glass. ( p.69) Copy tray ( p.53) Pull out the (upper) paper tray. Front cover ( p.54) Laser unit [A] (...

  • Page 80: Polygonal Mirror Motor

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Laser unit ( p.69) LD unit [B] ( x 1) Do not screw the LD unit in too tightly when you install it. Polygonal Mirror Motor Laser unit ( p.69) Two rubber bushings [A] Laser unit cover [B] ( x 1) Polygonal mirror motor [C] ( x 4)

  • Page 81: Laser Unit Alignment Adjustment

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Laser Unit Alignment Adjustment Reinstall the copy exit tray before you turn the main switch on. The laser beam may go out of the copier when the copy exit tray is not installed. The laser beam can seriously damage your eyes. Start the SP mode.
  • Page 82 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 edges). See the trim pattern made in step 2, and find how much the corners should be shifted. 10. Tighten the screw [A]. 11. Tighten the screws on the laser unit. 12. Reinstall the copy tray. 13.

  • Page 83: Pcu Section

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 PCU Section Toner bottle with the holder [A] Open the right door. Press the latch [B] and pull out the PCU [C]. Do not touch the OPC drum surface with bare hands. Load new developer ( p.79).

  • Page 84: Pick-Off Pawls And Toner Density Sensor

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Pick-off Pawls and Toner Density Sensor Do not turn the PCU upside down. This causes toner and developer to spill out. PCU ( Previous procedure) Pawl [A] Pull down the pawl and release the bottom end. Toner density sensor [B] ( x 1) The toner density sensor is taped to the bottom of the PCU.

  • Page 85: Opc Drum

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 OPC Drum PCU ( p.74) Front side piece [A] ( x 1) Rear side piece [B] ( x 2, 1 coupling) Separate the drum section [C] from the developer section [D]. To ensure that the left-side gears line up, keep the drum cover [E] closed when reinserting the front side piece.

  • Page 86: Charge Roller And Cleaning Brush

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Charge Roller and Cleaning Brush OPC Drum ( Previous procedure) Holding pin [A] Stepped screw [B] Charge roller [C] and cleaning brush [D] (with the holders and springs) Turn the gear [E] (as necessary) so that the rear holder [F] comes out. When reassembling, adjust the image quality ( p.80).

  • Page 87: Cleaning Blade

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Cleaning Blade Drum charge roller ( Previous procedure) Cleaning blade [B] ( x 2) When reassembling, adjust the image quality ( p.80). Reassembling Apply toner to the edge of the new cleaning blade when you replace the cleaning blade.

  • Page 88: Developer

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Developer PCU ( p.74) To let the toner fall to the development section, gently tap about eight different spots on the top of the PCU with a screwdriver. Each spot must be approximately at an equal distance from the next spot. Reinstall the PCU in the copier.

  • Page 89: After Replacement Or Adjustment

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Make sure no toner or developer stays on the gear. Clean the gears as necessary with a blower brush, etc. Be sure to replace the Mylar at the rear side in the correct position. (The Mylar protects the gears at the rear side from falling toner).

  • Page 90: Toner Supply Motor

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Toner Supply Motor Copy tray ( p.53) Open the front door. Toner bottle holder ( p.74) Toner supply motor [A] ( x 1)

  • Page 91: Paper Feed Section

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Paper Feed Section Paper Feed Roller Paper cassette Clip [A] Push the shaft back through the opening, and tilt it up. If the black plastic bushing [B] comes off, make sure you remount it when reinstall the shaft. Paper feed roller [C]...

  • Page 92: Friction Pad

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Friction Pad Paper cassette Clip [A] Push the shaft back through the opening, so that the roller moves clear of the friction pad. Friction pad [B] Paper End Sensor Paper cassette Paper end sensor [A] ( x 1)

  • Page 93: Exit Sensor

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Exit Sensor - Non-Duplex Models - Open the right door. Front right cover ( p.55) Guide [A] ( x 2) Exit sensor bracket [B] ( x 1) Exit sensor [C] ( x 1) - Duplex Models - Open the right door.

  • Page 94: By-Pass Feed Roller And Paper End Sensor

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Exit sensor bracket [E] ( x 1) Exit sensor [F] ( x 1) By-Pass Feed Roller and Paper End Sensor By-pass tray ( p.56) If you have a support to keep the by-pass tray within the reach of the connector cable, you do not need to disconnect the connector.

  • Page 95: Registration Roller

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Registration Roller PCU ( p.74) Front cover ( p.54) Right door ( p.56) Rear cover ( p.52) High-voltage power supply ( p.88) Registration clutch ( p.88) Unhook the springs [A] and [B] at the rear and front sides. Guide support [C] and guide [D] ( x 1, x 1)

  • Page 96: By-Pass Paper Size Switch

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 By-Pass Paper Size Switch By-pass tray ( p.56) Tray lever [A] ( x 1, 1 pin) Lift the upper tray [B] By-pass paper size switch [C] ( x 1) When reinstalling the switch: Move the paper guides to their middle position (about halfway between fully open and fully closed), and install the round gear so that the hole in the gear [D] aligns with the peg [E] on the sliding gear.

  • Page 97: Registration Clutch

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Registration Clutch Rear cover ( p.52) High-voltage power supply board (with the bracket) [A] ( x 4, all connectors) Registration clutch [B] ( x 1, x 1) Registration Sensor Open the right door. Registration sensor [A] ( x 1)

  • Page 98: Upper Paper Feed Clutch And By-Pass Feed Clutch

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Upper Paper Feed Clutch and By-Pass Feed Clutch Rear cover ( p.52) High-voltage power supply board ( p.88) Clutch cover [A] ( x 2, 2 bushings, x 2 ) Paper feed clutch [B] ( x 1) By-pass feed clutch [C] ( x 1) Make sure that the rotation-prevention tabs [D] on the clutches fit correctly into...

  • Page 99: Relay Sensor

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Relay Sensor Relay clutch (Previous procedure) Sensor bracket [A] ( x 1) Relay sensor [B] ( x 1) Lower Paper Feed Clutch (Two-tray Models Only) Rear lower cover ( p.52) Clutch bracket [A] ( x 2) Lower paper feed clutch [B] ( x 2, 1 bushing, x 1)

  • Page 100: Vertical Transport Sensor (Two-Tray Models Only)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Vertical Transport Sensor (Two-tray Models Only) Right lower cover ( p.57) Metal plate [A] ( x 3) Vertical transport sensor [B] ( x 1) Paper Size Switch Paper cassette Switch cover [A] ( x 1) Paper size switch [B] ( x 1)

  • Page 101: Image Transfer

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Image Transfer Image Transfer Roller Do not touch the transfer roller surface with bare hands Open the right door. Lift the plastic holders [A] with the image transfer roller [B]. Leave the springs under the holders. Make sure that the pegs [C] on the holders [D] engage with the springs when you reassemble.

  • Page 102: Image Density Sensor

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Image Density Sensor Open the right door. Plastic cover [A] Image transfer roller (Previous procedure) Push down on the notch [B] to free the sensor. Image density sensor [C] ( x 1)

  • Page 103: Fusing

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Fusing Fusing Unit The fusing unit can become very hot. Make sure that it has cooled down sufficiently before you handle it. Turn off the main switch, and unplug the machine. Front right cover Open the right door. Fusing unit [A] ( x 2, x 4)

  • Page 104: Fusing Lamps

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Fusing Lamps Fusing unit Separate the hot roller section [A] from the pressure roller section [B] ( x 4). Front holding plate [C] ( x 1) Rear holding plate [D] ( x 1) Fusing lamp with the connector (600W) [E] ( x 2) Fusing lamp with the connector (550W) [F] ( x 2)

  • Page 105: Hot Roller Stripper Pawls

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Hot Roller Stripper Pawls Hot roller section (See above) Roller guard [A] ( x 3) Metal holders [B] (1 holder for each) Hot roller stripper pawls [C] (1 spring for each) Hot Roller Hot roller stripper pawls (See above) Hot roller [A] (2 C-rings, 1 gear, 2 bearings)

  • Page 106: Thermostat

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Thermostat Hot roller (See above) Thermostat [A] ( x 2 for each) Pressure Roller and Bushings Separate the hot roller section from the pressure roller section ( p.95). Fusing entrance guide [A] ( x 2) 2 springs [B] 2 pressure arms [C] 2 Bushings [D] Pressure roller [E]...

  • Page 107: Nip Band Width Adjustment

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 NIP Band Width Adjustment Do this adjustment when the fusing unit is at its operating temperature. The size of the OHP sheet must be A4/LT LEF. Any other sizes may cause a paper jam. [A] Pressure roller [B] Hot roller Place an OHP sheet on the by-pass feed table.

  • Page 108: Cleaning Roller

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Cleaning Roller Pressure roller and bushings ( p.97) Cleaning roller [A]...

  • Page 109: Duplex Unit (Duplex Models B269/B277 Only)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Duplex Unit (Duplex Models B269/B277 Only) Duplex Exit Sensor Open the right door. Sensor bracket [A] ( x 1) Another bracket [B] comes off with the sensor bracket. Duplex exit sensor [C] ( x 1) Duplex Entrance Sensor Open the right door.

  • Page 110: Duplex Inverter Sensor

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Duplex Inverter Sensor Copy tray [A] ( x 2) Exit cover [B] ( x 1) Sensor bracket [C] ( x 1, x 1) Duplex inverter sensor [D] ( x 1)

  • Page 111: Duplex Transport Motor

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Duplex Transport Motor Open the right door. Detach the chain and spring from the frame, and lower the right door. Cover [A] ( x 1) Motor bracket [B] ( x 4, x 1). Duplex transport motor [C] ( x 2) Duplex Inverter Motor Rear cover...

  • Page 112: Duplex Control Board

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Duplex Control Board Rear lower cover ( p.52) Duplex control board [A] ( x 4 , all connectors)

  • Page 113: Other Replacements

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Other Replacements Quenching Lamp PCU ( p.74 ) Quenching lamp [A] ( x 1) High-Voltage Power Supply Board Rear cover ( p.52) High-voltage power supply board [A] ( x 2, 3 standoffs, all connectors)

  • Page 114: Bicu (Base-Engine Image Control Unit)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 BICU (Base-Engine Image Control Unit) Rear cover ( p.52) BICU [A] ( x 7, all connectors, 2 flat cables) Remove the NVRAM [B] from the old BICU and install it on the new BICU when you replace the BICU. The NVRAM keeps machine-specific data. Main Motor Rear cover ( p.52)

  • Page 115: Rear Exhaust Fan (B269/B277 Only)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Rear Exhaust Fan (B269/B277 Only) Rear cover ( p.52) Rear exhaust fan [A] ( x 2, x 1) Reassembling - Make sure that the arrow on the fan [B] points the outside of the copier when you reassemble The arrow indicates the direction of the air current.

  • Page 116: Left Exhaust Fan

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Left Exhaust Fan Rear cover ( p.52) Left cover ( p.54) Fan cover [A] ( x 3) Fan [B] ( x 3, x 1) Reassembling - Make sure that the arrow on the fan [C] points the outside of the copier when you reassemble.

  • Page 117: Gearbox

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Gearbox - Replacement Procedure - Inverter tray [A] Two screws [B] from the middle rear cover This step releases the topmost part of the BICU bracket. High-voltage power supply board (with the bracket) ( p.88) BICU (with the bracket) [C] ( x 6) If you have difficulty to remove the bracket, remove the screw at the middle of the crosspiece (see step 6).
  • Page 118 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 PCU ( p.74) This step releases the gear (on the gearbox) that drives the PCU. Ground plate [E] ( x 2) Gearbox [F] ( x 5, 1 belt) Do not change the position of the spring [G] and make sure that the bushing [H] on the PCU drive shaft is in the correct position you when you reassemble.
  • Page 119 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 - Gear Arrangement in the Gearbox - The gears are numbered 1 to 12 in the order in which they are to be installed in the gearbox. These numbers show both on the gearbox and on the front (exposed) surface of each gear.

  • Page 120: Copy Adjustments Printing/Scanning

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Copy Adjustments Printing/Scanning You need to perform the adjustment after you do a Memory All Clear, and after you replace or adjust any of the following parts. First or second scanner Lens Block Scanner Motor Polygonal Mirror Motor Paper Tray Paper Side Fence For detailed explanations about how to access and use the SP modes, see Section...
  • Page 121 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 A: Leading Edge Registration B: Side-to-side Registration - Blank Margin - If the leading edge or side-to-side registration cannot be adjusted to within the specification, then adjust the leading-edge blank margin or the left-side blank margin. Check the trailing edge and right side edge blank margins, and adjust them using the following SP modes.

  • Page 122: Scanning

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Check the magnification (the grid size should be 2.7 x 2.7 mm), and if necessary use SP 2998 to adjust it. The specification is 100 1%. Scanning Before doing the following scanner adjustments, check and adjust the printing leading-edge and side-to-side registrations and the printing blank margins (as described above).
  • Page 123 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 - Main Scan Magnification - Place the A3 test chart on the exposure glass and make a copy from one of the feed stations. Check the magnification ratio. If necessary, adjust the magnification using the following SP mode. SP mode Specification Main Scan Magnification...

  • Page 124: Adf Image Adjustment

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 ADF Image Adjustment A: Leading edge registration B: Side-to-side registration Make a temporary test chart as shown above, using A3/11" x 17" paper. Place the temporary test chart on the ADF and make a copy from one of the feed stations.
  • Page 125 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Check the registration, and if necessary adjust it with SP 6006 5. The specification is 1.0%.

  • Page 126: Troubleshooting

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Troubleshooting Service Call Conditions Summary There are four levels of service call conditions. Level Definition Reset Procedure To prevent damage to the machine, the main Enter SP mode, and then turn machine cannot be operated until the SC has the main power switch off and been reset by a service representative (see the note below).
  • Page 127 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Symptom Possible Cause Definition during initialization or Scanner home position sensor copying. connector defective Scanner drive motor connector defective BICU board defective Scanner home position error 2 Scanner home position sensor defective The scanner home Scanner drive motor defective position sensor does not Scanner home position sensor detect the on condition...
  • Page 128 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Symptom Possible Cause Definition detected. Poor connection of the PCU Polygonal mirror motor error The polygon mirror motor Polygon mirror motor defective does not reach operating Poor connection between the speed within 10 seconds polygonal mirror motor driver and the after the motor ON signal BICU board is sent, or does not turn...
  • Page 129 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Symptom Possible Cause Definition A current leak signal for High voltage supply board defective the transfer roller is Poor connection of the PCU detected. Transfer/separation unit set A current feedback signal incorrectly for the transfer roller is Transfer roller damaged not detected.
  • Page 130 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Symptom Possible Cause Definition continues 5 times Power supply board defective consecutively. The fusing temperature is not detected in 25 or 35 seconds. Fusing overheat error (center) The fusing temperature is over 230C for 1 second Fusing thermistor defective (detected by the Power supply board defective...
  • Page 131 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Symptom Possible Cause Definition Fusing overheat error (rear) The fusing temperature is over 230C for 1 second Fusing thermistor defective (detected by the Power supply board defective thermistor). Fusing lamp overheat error (rear) After the fusing temperature reaches the Fusing thermistor defective or out of target temperature, the...
  • Page 132 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Symptom Possible Cause Definition energy saver mode. (for GDI machine only) Accounting error 1 An error is detected during the communication Accounting device defective with the MF accounting Loose connection device. Accounting error 2 After communication is established with the MF Accounting device defective accounting device, a...
  • Page 133 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Symptom Possible Cause Definition within 60 seconds after the ADF starts feeding. Startup without video output end error Video transfer to the engine is started, but the engine did not issue a Controller board defective video transmission end command within the specified time.
  • Page 134 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Symptom Possible Cause Definition during the self-diagnostic test. Self-diagnostic Error: RAM The resident RAM returned a verify error Download controller firmware again during the self-diagnostic test. Self-diagnostic Error: ROM The resident read-only memory returned an error Controller board defective during the self-diagnostic Download controller firmware again...
  • Page 135 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Symptom Possible Cause Definition write/read test (done at memory power off/on and at recovery from low power or night/off mode). Printer application program error The printer status does not become ready when the printer application Application program defective program is necessary for image processing.
  • Page 136 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Symptom Possible Cause Definition perform an unexpected does not appear on the panel, and is operation. However, only logged. unlike SC990, the object of the error is continuity of the software. Unexpected Software Error Software encountered an Software defective unexpected operation not An error undetectable by any other...

  • Page 137: Electrical Component Defects

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Electrical Component Defects Sensors Component Condition Symptom The Paper Jam message will appear Open whenever a copy is made (paper has not 111-2 Registration reached the sensor). (BICU) The Paper Jam message appears even if Shorted there is no paper at the sensor.

  • Page 138: Switches

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Component Condition Symptom there is no paper at the sensor. 125-3 Open Toner Density SC390 is displayed. (BICU) Shorted 123-2 Open The toner density control process is Image Density (BICU) changed (see the note below the table). Shorted 102-2 Open...
  • Page 139 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Component Condition Symptom if the vertical transport door is opened. 113- Open The CPU cannot detect the proper paper Lower Paper Size 1,2,4 size, and misfeeds may occur when a Shorted (BICU) copy is made from the 2nd paper tray. The CPU misdetects or is not able to 136- detect the size of the paper set in the...

  • Page 140: Blown Fuse Conditions

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Blown Fuse Conditions All the fuses in the following table are on the power supply board. Rating Fuse 120 V 220 – 240 V 15A/125V 8A/250V 5A/125V 2.5A/250V 1A/250V 1A/250V 4A/250V 4A/250V 4A/250V 4A/250V 4A/250V 4A/250V 4A/250V 4A/250V...

  • Page 141: Led Display

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 LED Display BICU Number Function Monitors the +5 V line for the CPU and the surrounding circuit. LED 1 Usually, this LED is blinking.

  • Page 142: Service Tables

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Service Tables Service Program Mode Do not let the user access the SP mode. Only service representatives are allowed to access the SP mode. The machine quality or its operation is NOT guaranteed if persons other than service representatives accesses the SP mode. How to Enter the SP Mode The following two modes are available: SP Mode (Service Program Mode): The SP Mode includes the programs that are...
  • Page 143 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 While holding down the [Enter] key, press the [1] key (on the numeric keypad). While holding down the [Enter] key, press the "OK" key. Selecting Programs When a blinking underscore (or several blinking underscores) shows, you can type a number from the numeric keypad [D].

  • Page 144: Sp Mode Tables

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 SP Mode Tables The following codes are used: Asterisk (*): The settings are saved in the NVRAM. Most of them return to the default values when you execute SP 5801 2 The DFU menu is for design or factory use only. You must not change the settings. Brackets ([ ]): The brackets enclose the setting rage, default value, and minimum step (with unit) as follows: [Minimum Maximum / Default / Step].
  • Page 145 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Display By-pass 1007 1007 1 Display By-pass Displays the by-pass paper width switch output. Fusing Idling This program decides the action of the Fusing Drive Release Mechanism. When you select "1," the contact/release control is disabled and the drive 1103* power is always transmitted to the fusing unit.

  • Page 146: Sp2-Xxx (Drum)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Inputs the fan control time. The fan maintains normal speed for the specified time after occurrence of an SC or following entry into Warm-up mode, Low Power mode, or Night/Off mode. Fusing Jam SC Code Setting 0=No 1=Yes 1159* This SP mode detects SC559.
  • Page 147 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 [0.0 ~ 9.0 / 2.0 / 0.1 mm/step] ( p.111) Leading edge 2101 1 Specification: 2 ± 1.5 mm Adjusts the leading edge erase margin. [0.0 ~ 9.0 / 3.0 / 0.1 mm/step] ( p.111) Trailing Specification: 2 +2.5/–1.5 mm 2101 2 Adjusts the trailing edge erase margin.
  • Page 148 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 2221 3 PWM Displays the PWM value. 2221 4 Vsdp Displays the Vsdp value. 2221 5 Vt Displays the Vt value. 2221 6 Vts Displays the Vts value. Transfer Current Adjustment 2301* [–2 = –4 mA / –1 = –2 mA / 0 = 0 mA / 1 = 2 mA Normal paper / 2 = +4 mA] 2301 1 Adjusts the current applied to the transfer roller when feeding from a paper...
  • Page 149 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Polygon Mirror Motor Idling Time 2915* [0 = None / 1 = 15 s / 2 = 25 s] Selects the polygon mirror motor idling time. To increase the speed of the first copy, the mirror motor begins idling when the user sets an original, touches a key, or opens the platen cover or DF.

  • Page 150: Sp4-Xxx (Scanner)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 [0 = No / 1 = Yes] Selects whether the ID sensor is or is not used for toner density control. This 2927 1 value should normally be left at “1”. If the value is “0”, dirty background may occur after long periods of non-use.
  • Page 151 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 The specification is 100 ± 1.0% Main scan magnification is implemented in steps of 0.5. Accordingly, your input value should be a multiple of 0.5 (–1.0, –0.5, 0, +0.5, or +1.0) Leading Edge Registration (Scanner) [–5.0 ~ +5.0 / 0.0 / 0.1 mm/step] 4010* Adjusts the leading edge registration for scanning in platen mode ( p.111).
  • Page 152 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 APS Priority [0 = Normal / 1 = A4/LT / 2 = 8K/16K] 4305* 1. A4/LT North America model: When the ASP detects the LT size, the controller interprets it as the A4 size. Other models: When the ASP detects the A4 size, the controller interprets it as the LT size.
  • Page 153 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 returned if the adjustment result is not in the range of the values in SP 4901 6. White Number of Attempt [0 20 / 0 / 1/step] Displays how many times the white-level adjustment is retried. The value does not include the first execution of the white adjustment.
  • Page 154 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Notch Selection Selects the value of the center ID adjustment notch for the ID adjustment LEDs. Normally the center notch is 3 (range 1-5). If –1 is selected, each notch shifts 4923* down (becomes lighter). If +1 is selected, each notch shifts up (becomes darker).·...

  • Page 155: Sp5-Xxx (Mode)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 4932 1 Sharpness- Low ID (Copy) White Line Erase [0 ~ 2 / 1 / 1/step] 4941* Selects the white line erase level. 0: None, 1: Weak, 2: Strong 4941 1 This setting is effective only Photo 1, Photo 3, Special 3 or Special 4 mode. 0: White line erase is not used, and white level correction is used instead·...
  • Page 156 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 APS Mode [0 = Enabled / 1 = Disabled] 5127* 5127 1 Enables or disables the APS mode.. PM Alarm Interval (Printout) [0 ~ 9999 / 0 / 0K copies/step] 5501* 5501 1 Specifies when the PM alarm occurs. Memory Clear 5801 5801 2 Engine (...

  • Page 157: Sp6-Xxx (Peripherals)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 NVRAM Upload 5824 5824 1 ( p.165) NVRAM Download 5825 5825 1 ( p.165) Program Download 5827 5827 1 Downloads programs to the machine Printer Free Run 5901 5901 1 Executes the free run. Press "ON" to start; press "OFF" to stop. Test Pattern Print 5902 5902 1 (...

  • Page 158: Sp7-Xxx (Data Log)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Adjusts the side-to-side registration for the front side of the original, for ADF mode. Use the key to select “+” or “–” before entering the value ADF Adjustment (Leading Regist) [–5.0 ~ +5.0 / 0.0 / 0.1 mm/step] 6006 2 Adjusts the leading edge registration for ADF mode.
  • Page 159 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Counter–Paper Jam [0 ~ 9999 / 0 / 1/step] 7502* 7502 1 Shows the total number of copy paper jams. Counter–Orgn Jam [0 ~ 9999 / 0 / 1/step] 7503* 7503 1 Shows the total number of original jams, Counter-Each P Jam [0 ~ 9999 / 0 / 1/step] Displays the total number of the paper jams classified by timing and...
  • Page 160 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Counter-Each P Jam (Off-Duplex Exit) 7504 128 Paper does not reach the duplex exit sensor. Counter-Each P Jam (On-Duplex Exit) 7504 129 Paper is caught at the duplex exit sensor. Counter-Each P Jam (Off-1 bin Exit SN) 7504 130 Paper does not reach the one-bin tray.
  • Page 161 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Displays the P/N and suffix of the Printer/Scanner ROM. Display–PM Count 7803* 7803 1 Displays the PM counter. Reset–PM Counter 7804 Resets the PM counter (SP 7803 1). When the program ends normally, the 7804 1 message "Completed"...

  • Page 162: Sp8-Xxx (History)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Reset–Info Count 7992* Reset–Info Count (Reset-Timer Count) 7992 1 Clears the counter of SP 7991 1. Reset-Info Count (Reset-ID Er Count) 7992 5 Clears the counter of SP 7991 5. SP8-XXX (History) T: Total Scan PGS [0 9999999 / 0 / 1 sheet/step] 8191* Displays the total number of scanned pages.
  • Page 163 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 8381 1 Displays the print count of all application programs. C: Total Prt PGS [0 9999999 / 0 / 1 sheet/step] 8382* 8382 1 Displays the print count of the copier application program. F: Total Prt PGS [0 9999999 / 0 / 1 sheet/step] 8383* 8383 1 Displays the print count of the fax application program.
  • Page 164 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 T: PrtPGS/Ppr Size [0 9999999 / 0 / 1 sheet/step] Displays the total print count classified by paper size. This is the total for all 8441* application programs. 8441 1 (A3) 8441 2 (A4) 8441 3 (A5) 8441 4 (B4) 8441 5 (B5) 8441 6 (DLT)

  • Page 165: Sp9-Xxx (Etc.)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Displays the total print count classified by paper source. 8451 1 Bypass Tray 8451 2 Tray 1 8451 3 Tray 2 8451 4 Tray 3 8451 5 Tray 4 T: PrtPGS/Ppr Type [0 9999999 / 0 / 1 sheet/step] Displays the total print count classified by paper size.

  • Page 166: Using Sp Modes

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Using SP Modes Adjusting Registration and Magnification To adjust the registration and magnification, you need to use several service programs. The chart shows an example of the procedure to adjust the machine in the basic configuration.

  • Page 167: Id Sensor Error Analysis (Sp 2221)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 ID Sensor Error Analysis (SP 2221) The image quality may become very bad when the ID sensor does not operate properly. However, there is no such SC code that indicates ID-sensor malfunction; instead, SP 2221 shows you some information on the ID sensor. Check this information when the image quality is not very good.

  • Page 168: Memory Clear

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 document feeder (or platen cover) is open. Example 2 indicates that the paper size and its orientation is "A4 LEF," and that the document feeder (or platen cover) is closed. The "Paper Size" data starts with eight digits. The first digit indicates the output of L2; the second digit, L1;...
  • Page 169 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 than controller data SCS, IMH, MCS, Copier application, Printer application, Controller data Controller SP 5801-xxx Scanner application, Web service/network application, NCS, R-Fax, DCS, UCS - Exceptions - SP 5801 2 (basic machine) and SP 5998 1 (GDI machine) clears most of the settings and counters stored in the NVRAM on the BICU (the values return to their default values).

  • Page 170: Input Check (Sp 5803)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Select "Execute." When the program has ended normally, the message "Completed" shows. If the program has ended abnormally, an error message shows. Press the cancel key. Turn the main switch off and on. 10. Download the NVRAM data from a flash memory card ( p.165) - Without Flash Memory Card - Print out all SMC data lists (...
  • Page 171 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Num. Sensor/Switch Lower Relay S Paper detected Not detected Vertical Trans S Paper detected Not detected Registration Sensor Paper detected Not detected Exit Sensor Paper detected Not detected Duplex Inverter S Paper detected Not detected Duplex Entrance S Paper detected Not detected Duplex Exit S...

  • Page 172: Output Check (Sp 5804)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Copier 8Hx13 Europe Not set A4 LEF A4 SEF A5 LEF LT LEF A3 SEF North 8Hx13 Not set A4 LEF LT SEF LG SEF LT LEF DLT SEF America China Not set A4 LEF B5 LEF A4 SEF A5 LEF B4 SEF -- A3 SEF Paper Feed...
  • Page 173 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 To stop the operation, select "OFF." - Output Check Table - Number 005, 006, 040, and 041 may not respond when the fusing temperature is high. Num. Component Main Motor Forward Main Motor Reverse Quenching Lamp Toner Supply Motor Forward Fan Motor High Fan Motor Low...

  • Page 174: Serial Number Input (Sp 5811)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Serial Number Input (SP 5811) - Specifying Characters - SP 5811 1 specifies the serial number. For the basic machine (the machine without the optional controller), you use the numeric keypad. For the GDI machine (the machine with the optional controller), you use the numeric keypad and the optional operation panel.
  • Page 175 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 - NVRAM Upload (SP 5824 1) - Turn off the main switch. Remove the card cover [B] (1 rivet). Turn the face of the flash memory card [A] ("A" is printed on it) toward your left- hand side, and insert it into the card slot.

  • Page 176: Firmware Update Procedure

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Turn off the main switch. Remove the card cover [B] (1 rivet). Turn the face of the flash memory card [A] ("A" is printed on it) toward your left- hand side, and insert it into the card slot. Turn on the main switch.
  • Page 177 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Insert the flash memory card [A]. Press down the power switch on the operation panel and hold it, and turn on the main switch. Select "Execute" [C]. Do not touch any key while the message "Load Status..." shows. This message indicates that the program is running.
  • Page 178 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 GDI (Printer Scanner) Update Procedure Turn the main switch off. Remove the slot cover [A] (1 x Insert the flash memory card [B] as shown above...

  • Page 179: Test Pattern Print (Sp 5902 1)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Turn on the main power switch Push the printer application key [C] Push the OK key [D] and then push Execute. Do not turn the machine off while the message “Now Writing” shows. This message indicates the program is running. Make sure the message “Completed”...
  • Page 180 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Press the copy start key. The copy mode is activated Specify copy settings and press the key. To return to the SP mode, press the key. - Test Patterns - Test Patterns Using VCU Pattern (No print) Vertical Lines (Single Dot) Horizontal Lines (Single Dot) Vertical Lines (Double Dot)

  • Page 181: Paper Jam Counters (Sp 7504)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Test Patterns Using IPU A4 Gradation Patches 2 (128 Grades) Trimming Area (A4) Test Patterns Using SBU Pattern Grid Pattern (double dot) Gray scale 1 (256 grades) Gray scale 2 (256 grades) Paper Jam Counters (SP 7504) The table lists the menu numbers (the last three digits of SP 7504 XXX) and the paper jam timings and locations.

  • Page 182: Original Jam History Display (Sp 7508)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Basic machine: 001 All, 002 SP, 003 UP, 004 Log, or 005 Big Font GDI machine: 001 All (Data List), 002 SP (Mode Data List), 003 User Program, 004 Logging Data, 005 Diagnostic Report, 006 Non-Default, 007 NIB Summary, 008 Net File Log, 021 Copier User Program, 022 Scanner SP, 023 Scanner User Program, 040 Parts Alarm Counter Print, 064 Normal Count Print, 065 User Code Counter, 066 Key Operator Counter, 067 Contact List Print, 069 Heading1 print,...

  • Page 183: Adf Aps Sensor Output Display (Sp 6901)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 ADF APS Sensor Output Display (SP 6901) - Sensor Positions - Large to Small - Reading Data - Paper Size EU/AA — B5 LEF 11" x 17" " x 5 " LEF A5 LEF " x 11" SEF A4 SEF "...

  • Page 184: Detailed Section Descriptions

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Detailed Section Descriptions Overview Component Layout The above illustration is the B269/B277 model. B245/B268/B276: No duplex unit, one paper tray 1. 2nd Mirror 21. Registration Roller 2. Exposure Lamp 22. Registration Sensor 3. 1st Mirror 23. By-pass Tray 4.

  • Page 185: Paper Path

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 16. Pressure Roller 36. Laser Unit 17. OPC Drum 37. Toner Supply Bottle Holder 18. Middle Transport Roller 38. Exit Roller 19. Duplex Exit Sensor 39. 3rd Mirror 20. Image Density Sensor 40. Scanner HP Sensor Paper Path The B269/B277 model has a duplex unit mounted on the right side of the machine.

  • Page 186: Drive Layout

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Drive Layout 1. Scanner Motor 6. Relay Clutch 2. Main Motor 7. Lower Paper Feed Clutch 3. Hot Roller 8. By-pass Feed Clutch 4. OPC Drum 9. Upper Paper Feed Clutch 5. Development Roller 10. Registration Clutch...

  • Page 187: Board Structure

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Board Structure Block Diagram Only B269/B277 models contain the duplex unit. The one-bin tray is for models B268/B269 (with the optional controller box). BICU (Base Engine and Image Control Unit)

  • Page 188: Sbu (Sensor Board Unit)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 The main board controls the following functions: Engine sequence Timing control for peripherals Image processing, video control Operation control, system control (Basic machine only) Machine control Drive control for the sensors, motors, and clutches of the printer and scanner High voltage supply board control Serial interfaces with peripherals Fusing control...

  • Page 189: Copy Process Overview

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Copy Process Overview Exposure A xenon lamp exposes the original. Light reflected from the original passes to the CCD, where it is converted into an analog data signal. This data is converted to a digital signal, processed and stored in the memory. At the time of printing, the data is retrieved and sent to the laser diode.
  • Page 190 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 on the laser beam intensity, which is controlled by the BICU board. Development The magnetic developer brush on the development roller comes in contact with the latent image on the drum surface. Toner particles are electrostatically attached to the areas of the drum surface where the laser reduced the negative charge on the drum.

  • Page 191: Scanning

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Scanning Overview 1. Exposure Lamp 5. Scanner Motor 2. 1st Scanner 6. Original Length Sensor 3. Exposure Glass 7. Original Width Sensors 4. Lens Block 8. Scanner HP Sensor The original is illuminated by the exposure lamp (a xenon lamp). The image is reflected onto a CCD (charge coupled device) on the lens block via the 1st, 2nd, and 3rd mirrors, and through the lens on the lens block.

  • Page 192: Scanner Drive

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Scanner Drive A stepper motor drives the 1st and 2nd scanners [A, B]. The 1st scanner is driven by the scanner drive motor [C], drive gear through the timing belt [D], scanner drive pulley [E], scanner drive shaft [F], and two timing belts [G]. The 2nd scanner is driven through the 1st scanner and two timing belts [H].

  • Page 193: Original Size Detection In Platen Mode

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 mode. Original Size Detection in Platen Mode In the optics cavity for original size detection, there are four reflective sensors. The original width sensors [A] detect the original width, and the original length sensors [B] detect the original length.
  • Page 194 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Original Size Length Sensors Width Sensors SP 4301 display A4/A3 version LT/DLT version 11" x 17" 11110000 8.5" x 14" 11010000 8.5" x 13" — 11000000 A4-SEF 8.5" x 13" 01000000 A4-LEF 11" x 8.5" 00110000 B5-LEF 8.5"...

  • Page 195: Image Processing

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Image Processing Overview The CCD generates an analog video signal. The SBU (Sensor Board Unit) converts the analog signal to an 8-bit digital signal, then it sends the digital signal to the BICU board. The BICU board can be divided into three image-processing blocks: the IPU (Image Processing Unit), FCI (Fine Character Image), and VCU (Video Control Unit).

  • Page 196: Sbu (Sensor Board Unit)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 SBU (Sensor Board Unit) The CCD converts the light reflected from the original into an analog signal. The CCD line has 7,400 pixels and the resolution is 600 dpi (23.6 lines/mm). The CCD has two output lines, for odd and even pixels, to the analog processing circuit. The analog processing circuit performs the following operations on the signals from the CCD: Z/C (Zero Clamp):...

  • Page 197: Ipu (Image Processing Unit)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 IPU (Image Processing Unit) Overview The image data from the SBU goes to the IPU (Image Processing Unit) on the BICU board, which carries out the following processes on the image data: Auto shading White/black line correction Scanner gamma correction Magnification (main scan) Filtering (MTF and smoothing)
  • Page 198 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 All modes can be customized with a range of SP modes that can be adjusted to meet user requirements. The user can select the mode that best suits their original with the following user tool: Original Type: User Tools – Copier Features – Image Adjustment Original Type Mode Targeted Original Type...
  • Page 199 B245/B276/B277/B268/B269 Service Manual 18-Jan-06...
  • Page 200 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Original Modes The machine has 10 original modes. There are two text modes, three photo modes, and five “special” modes. The original mode key on the operation panel has two settings, text and photo. With the default settings, the machine uses “Normal Text (Text 1)”...
  • Page 201 B245/B276/B277/B268/B269 Service Manual 18-Jan-06...
  • Page 202 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Auto Shading Overview There are two auto shading methods: black level correction and white level correction. Auto shading corrects errors in the signal level for each pixel. Black and white level correction is always done. Black Level Correction The IPU detects the black dummy data from one end of the CCD signal (32 pixels at the end are blacked off) and takes the average of the black dummy data.
  • Page 203 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 When you specify "2," instead of "1," in SP 4941 1, the feature erases darker white lines (namely, less whiter lines). Note that this SP does not affect the width of white lines to be erased. Black Line Erase The black line erase feature is the function that erases black lines made by the dust or dirt on the exposure glass.
  • Page 204 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Scanner Gamma Correction The CCD output is not proportional to the quantity of light received. Scanner correction corrects the CCD output so that grayscale data is proportional to the quantity of light received. The machine has two possible scanner gamma curves: Text and Photo. When selecting Text, the machine does not use scanner gamma correction.
  • Page 205 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Mirroring for ADF Mode When making copies using the ADF, the magnification circuit creates a mirror image. This is because the scanning start position along the main scan direction in ADF mode is at the opposite corner of platen mode. In platen mode, the original is placed face down on the exposure glass.
  • Page 206 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 part of an edge, the machine applies the MTF filter for edges, using the value set in SP 4930. The higher the setting, the sharper the image. However, this is only used when the customer uses Text 1, Text 2, Photo 1-3, Special 1, Special 2, or Special 5. The default value is “0”...
  • Page 207 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Gradation Processing Overview There are three types of gradation processing (listed below). Refer to the “Default Image Processing Mode for Each Original Type” section for more details on which processes are used for each original mode. Binary picture processing Error diffusion Dithering...

  • Page 208: Video Control Unit (Vcu)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Video Control Unit (VCU) Fine Character and Image (FCI) The FCI performs image smoothing. This functions only affects binary picture processed images for certain original modes. Usually, binary picture processing generates jagged edges on characters, as shown in the above illustration.

  • Page 209: Laser Exposure

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Laser Exposure Overview 1. LD unit 7. 2nd mirror 2. Synchronization detector lens 8. F-theta lens 3. Double toroidal lens 9. Polygon mirror 4. Shield glass 10. Cylindrical lens 5. OPC drum 11. Synchronization detector mirror 6.

  • Page 210: Auto Power Control (Apc)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Auto Power Control (APC) The LD driver IC drives the laser diode. To prevent the intensity of the laser beam from changing because of the temperature, the machine monitors the current passing through the laser diode (LD). The machine adjusts the current to the laser diode by comparing it with the reference level from the reference circuit.

  • Page 211: Ld Safety Switch

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 LD Safety Switch To ensure technician and user safety and to prevent the laser beam from inadvertently switching on during servicing, there are safety switches at the front and right covers. When the front cover or the right cover is opened, the power supply to the laser diode is interrupted.

  • Page 212: Photoconductor Unit (Pcu)

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Photoconductor Unit (PCU) Overview The PCU consists of the components shown in the above illustration. An organic photoconductor (OPC) drum (diameter: 30 mm) is used in this machine. 1. Cleaning Blade 6. Development Roller 2. Toner Collection Coil 7.

  • Page 213: Drive

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Drive The main motor [A] drives the drum [B] through a series of gears and the drum drive shaft [C]. The main motor assembly includes a drive controller, which outputs a motor lock signal when the rotation speed is out of the specified range.

  • Page 214: Drum Charge

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Drum Charge Overview This copier uses a drum charge roller to charge the drum. The drum charge roller [A] always contacts the surface of the drum [B] to give it a negative charge of –950 V. The high voltage supply board gives a negative charge of –1700 V to the drum charge roller through the screw [C] and terminal plate [D].

  • Page 215: Charge Roller Voltage Correction

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Charge Roller Voltage Correction Correction for Environmental Conditions With a drum charge roller system, the voltage transferred from roller to drum varies with the temperature and humidity around the drum charge roller. The higher the temperature or humidity is the higher the applied voltage required.

  • Page 216: Id Sensor Pattern Production Timing

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 voltage is compared with Vsg (read from the bare drum at the same time). If the humidity drops, the drum potential goes up (to a higher negative voltage) even if the charge roller voltage supply stays the same (efficiency of voltage transfer is higher with lower humidity).

  • Page 217: Development

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Development Overview The development unit consists of the following parts. Development roller Mixing auger 2 TD sensor Mixing auger 1 Doctor blade This machine uses a single-roller development system. Two mixing augers mix the developer. The toner density (TD) sensor and image density (ID) sensor (see the illustration in the PCU section) are used to control the image density on the copy.

  • Page 218: Drive

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Drive The main motor [A] drives the development roller [B] and mixing augers [C] through a train of gears and the development drive shaft [D]. When the PCU is pushed in, the development drive shaft engages the development roller gear. The development drive gears (except for the gears in the development unit) are helical gears.

  • Page 219: Development Bias

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 towards the front of the machine. Mixing auger 1 [B] returns the excess developer, along with new toner, to the rear of the mixing assembly. Here the developer is reapplied to the development roller. Development Bias This machine uses a negative-positive development system, in which black areas of the latent image are at a low negative charge (about –154 50 V) and white areas are at a high negative charge (about –950 V).

  • Page 220: Toner Supply

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Toner Supply Toner Bottle Replenishment Mechanism When a toner bottle is placed in the bottle holder unit [A] and the unit is pushed in completely, toner shutter [B] moves against the side [C] of the PCU. When the toner bottle holder lever [D] is put back in the original position, the cap [E] on the toner bottle is pulled away and kept in place by the chuck [F].

  • Page 221: Toner Supply Mechanism

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Toner Supply Mechanism The toner supply motor [A] drives the toner bottle [B] and the mylar blades [C]. First, the toner falls down into the toner bottle holder. The toner supply mylar blades transfer the toner to the slit [D]. When the PCU is installed in the machine, the shutter [E] above the PCU is opened by the toner bottle holder.
  • Page 222 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 The four-toner density control modes are as follows. Sensor control 1 Mode Sensor control 1 (SP 2921, “0”): Normally use this setting only Toner supply decision Compare Vt with a reference voltage (Vts or Vref) Toner is supplied to the development unit when Vt is higher than the reference voltage (Vts or Vref).
  • Page 223 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Toner control process This toner control process is the same as sensor control 1 mode. Toner supply amount Fixed (SP 2925) Toner end detection Performed Fixed control 2 Fixed control 2 (SP 2921, “3”): Use temporarily if the TD sensor Mode needs to be replaced Toner supply decision None...
  • Page 224 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Toner Supply Reference Voltage (Vref) Determination The toner supply reference voltage (Vref) is used for toner supply determination (see below). Vref is determined using the following data: ID sensor output (Vsp/Vsg) (Vts or the current Vref) - Vt Toner Supply Determination The reference voltage (Vts or Vref) is the threshold voltage for determining whether or not to supply toner.

  • Page 225: Toner Supply In Abnormal Sensor Conditions

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 The value of “t” can be changed using SP 2922 (default: 0.4 second) The value of “T” can be changed using SP 2923 (default: 30 seconds) T (30) means that toner is supplied intermittently in a 1/3 duty cycle (1 s on, 2 s off) for 30 seconds Toner Supply in Abnormal Sensor Conditions ID Sensor...
  • Page 226 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 enters the toner near end condition and the toner end indicator starts blinking. Then the machine supplies toner for a certain time, which depends on the setting of SP 2923 (see the previous page). Toner Near End Recovery If the machine detects “Vt <...

  • Page 227: Drum Cleaning And Toner Recycling

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Drum Cleaning and Toner Recycling Drum Cleaning The cleaning blade [A] removes any toner remaining on the drum after the image is transferred to the paper. This model uses a counter blade system. The cleaning blade scrapes off toner remaining on the drum. When toner builds up in the cleaning unit, toner at the top of the pile is removed by the toner collection coil [B].

  • Page 228: Toner Recycling

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Toner Recycling Toner picked up by the toner collection coil [A], is transported to the opening [B] in the side of the PCU. Then, this toner falls into the development unit with new toner coming from the toner bottle and it is all mixed together by mixing auger 1 [C] and used again.

  • Page 229: Paper Feed

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Paper Feed Overview There are one or two paper trays, each of which can hold 250 sheets. The paper tray feed stations use a friction pad system. To prevent paper from getting caught inside the machine when the tray is pulled out, the paper feed roller and shaft do not separate from the tray when the tray is pulled out.

  • Page 230: Paper Feed Drive Mechanism

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Paper Feed Drive Mechanism The main motor [A] drives the pick-up and feed mechanism of both the first and second paper trays. The paper feed clutches [B] transfer drive from this motor to the paper feed rollers [C].

  • Page 231: Paper Lift Mechanism

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Paper Lift Mechanism When the paper tray [A] is closed, projection [B] on the copier frame pushes slider [C] (on the bottom part of the paper tray) off the bottom plate hook [D]. After the release slide comes off, compressed springs lift the bottom plate.

  • Page 232: Paper Size Detection

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Paper Size Detection Paper Tray Size A3, 11" x 17" A4 LEF A4 SEF, 8 " x 11" A5 LEF, 8 " x 14" " x 13" 11" x 8 " * (Asterisk) ON=Not pushed, OFF=Pushed There are three paper size micro-switches [A] on the front right plate of the paper tray unit.
  • Page 233 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 The by-pass feed paper size switch [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 paper size switch.

  • Page 234: Side Fences

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Side Fences If the tray is full of paper and it is pushed in strongly, the fences may deform or bend. This may cause the paper to skew or the side-to-side registration to be incorrect. To correct this, each side fence has a stopper [A] attached to it.
  • Page 235 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 The amount of paper buckle at the registration roller to correct skew can be adjusted with SP 1003. If jams frequently occur after registration, SP 1903 can be used to activate the relay clutch so that the relay roller assists the registration roller in feeding the paper along. When feeding from the by-pass tray, the by-pass feed clutch is activated, turning the by-pass feed roller.

  • Page 236: Image Transfer And Paper Separation

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Image Transfer and Paper Separation Overview The transfer roller [A] touches the surface of the drum [B]. The high voltage supply board supplies a positive current to the transfer roller, which attracts the toner from the drum onto the paper.

  • Page 237: Image Transfer Current Timing

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Image Transfer Current Timing There are two transfer current levels: low and high. The image transfer procedure is as follows: When the CPU receives the image writing start signal, the CPU instructs the high voltage supply board to supply +10 microamperes (low transfer current level) to the roller.

  • Page 238: Paper Separation Mechanism

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 During transfer roller cleaning, the high voltage supply unit supplies a negative cleaning voltage (about –1 kV) to the transfer roller. Any negatively charged toner on the transfer roller is then transferred back to the drum. Then a positive cleaning current (+10 microamperes) is applied to the transfer roller to push back to the drum any positively charged toner on the transfer roller.

  • Page 239: Image Fusing And Paper Exit

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Image Fusing and Paper Exit Overview 1. Paper exit roller 7. Fusing lamps 2. Exit sensor 8. Thermistor 3. Hot roller strippers 9. Thermostat 4. Pressure roller 10. Hot roller 5. Cleaning roller 11. Thermostat 6. Pressure spring...

  • Page 240: Fusing Unit Drive And Release Mechanism

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Fusing Unit Drive and Release Mechanism Fusing Unit Drive The main motor [C] drives the fusing unit through a gear train, and drives the paper exit rollers [A] through the timing belt [B]. Drive Release Mechanism When the right door [I] is open, the spring [G] pushes the top end of the gear holder [F] to the right.

  • Page 241: Fusing Entrance Guide Shift

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 The hot roller [L] takes a shorter time to become hot enough if it is not turning during warming up. When, however, the fusing temperature (at the start) is low, the temperature of the hot-roller surface may become uneven. You can disable this control ( p.135).

  • Page 242: Pressure Roller

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 If creasing occurs frequently in the fusing unit, adjust the entrance guide to the right, by securing it with the inner holes [C]. This allows more direct access to the gap between the hot roller and the pressure roller. Pressure Roller The pressure springs [A] constantly apply pressure between the hot roller [B] and the pressure roller [C].
  • Page 243 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 The CPU checks the output from the fusing thermistor once every 1.5 seconds. The CPU decides how long the lamps must be switched on during the next 1.5 seconds by comparing the following temperatures: The center thermistor temperature and the target center temperature The end thermistor temperature and the target end temperature The fusing lamp works to maintain a target fusing temperature of 160C during copying.

  • Page 244: Overheat Protection

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 The Warm Up Temperature (SP 1105 1-2) to output the first print after the Low Power Mode. The Copying Temperature (T4: SP 1105 5-6) to output the second print (and after the second) You can raise the Warm Up Temperature to make better the fusing quality of the first print. While the copier is adjusting the fusing temperature to the Warm Up Temperature, the message "Copy starts after warm up"...
  • Page 245 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 feature can fully protect the hardware. The second feature works as the fail-safe feature for the first one. The third feature works as the fail-safe feature for the second one. First Feature: If the fusing temperature reaches 230C (or higher) and stays so for one second, the controller turns the fusing lamp off.

  • Page 246: Duplex Unit

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Duplex Unit Overall The printed page from the fusing unit goes straight through to the exit tray, or upward to the inverter section, depending on the position of the junction gate. If the user selects duplex mode, the page is directed to the inverter tray, then reversed through the duplex unit, and back into the machine for printing the second side.

  • Page 247: Drive Mechanism

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Drive Mechanism 1. Duplex Inverter Roller 4. Duplex Transport Motor 2. Duplex Inverter Motor 5. Lower Transport Roller 3. Upper Transport Roller 6. Middle Transport Roller Basic operation To increase the productivity of the duplex unit, copies are printed as follows. - Larger than A4 Short-edge/LT Short-edge - The paper feed path can hold only one sheet of copy paper at a time.
  • Page 248 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 - Up to A4 Short-edge/LT Short-edge - The paper feed path can hold two sheets of copy paper. Example: 8 pages. The number [A] in the illustration shows the order of pages. The number [B] in the illustration shows the order of sheets of copy paper (if black, this indicates the second side).
  • Page 249 B245/B276/B277/B268/B269 Service Manual 18-Jan-06...

  • Page 250: Feed In And Exit Mechanism

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Feed In and Exit Mechanism During duplex copying, the inverter gate solenoid [A] switches on and the junction gate [B] switches over to direct the paper to the inverter. When the paper trailing edge reaches the duplex inverter sensor [C], the inverter roller [D] reverses its rotation direction and the paper goes to the duplex unit.

  • Page 251: Energy Saver Modes Of Basic Machines

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Energy Saver Modes of Basic Machines This section illustrates the energy saver modes of the basic machine (the machine without the optional controller). For the energy saver modes of the GDI machine (the machine with the optional controller), see the section of "Energy Saver Modes of GDI Machines". Overview The machine has two energy-saver modes: the Low Power Mode and the Night/Off Mode.

  • Page 252: Aof

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 When AOF is off, the engine controller is unable to start the Night/Off Mode. The user should keep AOF on ( > System Settings > Key Operator Tools > AOF). Timers The engine controller references the Energy Saver Timer to start the Low Power Mode, and references the Auto Off Timer to start the Night/Off Mode.

  • Page 253: Energy Saver Modes Of Gdi Machines

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Energy Saver Modes of GDI Machines This section illustrates the energy saver modes of the GDI machine (the machine with the optional controller). For the energy saver modes of the basic machine (the machine without the optional controller), see the section of "Energy Saver Modes of Basic Machines". Overview The machine has three energy-saver modes: the Low Power Mode, the Transit Mode, and the Night/Off Mode.

  • Page 254: Aof

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 See "" in the section of "Energy Saver Modes of Basic Machines". Timers The Energy Saver Timer and Auto Off Timer start at the same time (t0) when the machine ends all jobs, when the user ends all manual operations, or when the controller starts the default application program (the program specified by the user [ >...

  • Page 255: Specifications

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Specifications General Specifications Configuration: Desktop Copy Process: Dry electrostatic transfer system Originals: Sheet/Book/Object Original Size: Maximum A3/11" x 17" Maximum: A3/11" x 17" A5 LEF/8 " x 5 " (Paper tray), Minimum: A6 SEF/5 " x 8 "...
  • Page 256 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 with ISO 7779. Measurements were taken from the normal position of the operator. B245/B276/B268: 550 x 568 x 420 mm (21.7" x 22.4" x 16.5") B269/B277: 587 x 568 x 558 mm (23.1" x 22.4" x 23.0") Dimensions (W x D x H): Measurement Conditions With bypass feed table closed...
  • Page 257 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 250 sheets (B245/B276/B268) 250 sheets x 2 (B277/B269) Optional Paper Tray Unit: 500 sheets x 1, or 500 sheets x 2 Bypass Tray: 100 sheets (sheets up to 432 mm [17"]) 40 postcards 10 envelopes Copy weight: 80 g/m (20 lb.) Toner Replenishment: Cartridge replacement (260 g/cartridge)

  • Page 258: Supported Paper Sizes

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Supported Paper Sizes Original Size Detection North America, Europe, Asia, Taiwan North America Europe/Asia/Taiwan Paper Size (W x L) Platen Platen A3 SEF 297 x 420 mm B4 SEF 257 x 364 mm A4 SEF 210 x 297 mm A4/LT A4/LT A4 LEF...
  • Page 259 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 China, Korea China/Korea China/Korea (localized) Paper Size (W x L) Platen Platen A3 SEF 297 x 420 mm B4 SEF 257 x 364 mm A4 SEF 210 x 297 mm A4 LEF 297 x 210 mm B5 SEF 182 x 257 mm B5 LEF...

  • Page 260: Paper Feed And Exit

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Paper Feed and Exit Main Frame, Duplex Main frame tray Size Paper Duplex China/ North Asia/ (W x L) Europe Korea America Taiwan A3 SEF 297 x 420 mm A3 LEF 420 x 297 mm B4 SEF 257 x 364 mm B4 LEF 364 x 257 mm...
  • Page 261 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Key: Detected (Main frame tray)/Processed (Duplex) Not detected (Main frame tray)/Not processed (Duplex) Selected manually Specified from the key pad Custom W: 90 to 297 mm L: 148 to 600 mm...

  • Page 262: Machine Configuration

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Machine Configuration...
  • Page 263 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Unit/Component Machine Code Diagram Copier (1-tray non-duplex model) B245/B268/B276 Copier (2-tray with duplex) B269/B277 [C] + [G] Platen cover (optional) B406 ADF (optional) B813 Copier ARDF (optional) B814 Paper tray unit–1 tray (optional) B385 Paper tray unit–2 trays (optional) B384 1-bin tray (optional) B621...

  • Page 264: Optional Equipment

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 Optional Equipment ARDF Standard sizes Single-sided mode: A3 to A5, 11" x 17" to " x 8 " Double-sided mode: A3 to A5, 11" x 17" to " x 8 " Original Size: Non-standard sizes (Single-sided mode only) Max.

  • Page 265: One-Tray Paper Tray Unit

    B245/B276/B277/B268/B269 Service Manual 18-Jan-06 One-Tray Paper Tray Unit Paper Size A5 to A3, 5 " x 8 " SEF to 11" x 17" Paper Weight: 60 – 105 g/m , 16 – 28 lb Tray Capacity: 500 sheets (80 g/m , 20 lb ) x 1 tray Paper Feed System: Feed roller and friction pad...
  • Page 266 B245/B276/B277/B268/B269 Service Manual 18-Jan-06 461 mm x 478 mm x 104 mm Size (W x D x H): (508 mm x 478 mm x 104 mm when tray extended)

This manual is also suitable for:

B245B268B277B276B269

Table of Contents