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Kyocera Mita FS-6750 Service Manual

Kyocera mita fs-6750 laser printer service manual
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SERVICE
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Summary of Contents for Kyocera Mita FS-6750

  • Page 1 SERVICE MANUAL...
  • Page 2 FS-6750 Service Manual ©Kyocera Corporation 2001 All rights reserved. Export Edition Notice Trademark Notice Warning The information in this manual is PRESCRIBE is a registered This equipment has been certified to subject to change without notification. trademark of Kyocera Corporation.
  • Page 3 Conventions/Preface Conventions Throughout this manual, the following conventions are used: Color (red) is available when viewed online to emphasize important notices. letters are used to name printer parts and assemblies. CAPITAL Italic letters refer related chapters or sections or documentations. Bold letters are also used for emphasis wherever italics may cause a confuse.
  • Page 4 Conventions/Preface About the chapters ... The service manual applies to the printer model Ecosys FS-6750 and its option paper feeder PF-26. It provides information on servicing the equipment in the following chapters: Chapter Contents One - Product information Includes printer specifications, product appearances, safety information, etc.
  • Page 5 Conventions/Preface REVISION HISTORY Version Date Replaced pages Remarks 1.00 7-Nov-01 — — http://www.kyocera.com VISIT US AT OUR INTERNET HOME PAGE:...
  • Page 6 Conventions/Preface This page left intentionally blank...

  • Page 7: Table Of Contents

    Chapter 1 P R O D U C T I N F O R M A T I O N 1.1 Printer identification labeling, page 1-2 1.2 Printer specifications, page 1-3 Expansion memory (DIMM), page 1-4 Memory card (CompactFlash), page 1-5 Hard disk (Microdrive), page 1-6 1.3 Front and internal views, page 1-7 Internal Component, page 1-8...

  • Page 8: Printer Identification Labeling

    The printer bears its model and serial numbers on a label at its back. The label also contains other safety precautions. Figures below show the printer labels in two dif- ferent destinations (versions). Figure 1.1 Printer labels Taiwan version Korea version FS-6750...

  • Page 9: Printer Specifications

    ±10%, 60 Hz ±2% Watts Max. 928 W, normal 421 W, standby 122 W, sleep 16 W (Taiwan) Max. 928 W, normal 419 W, standby 120 W, sleep 19 W (Korea) Current consumption 7.6 A (Taiwan)/3.9 A (Korea) Environment FS-6750...

  • Page 10: Expansion Memory (Dimm)

    No responsibility is assumed by Kyocera Mita with respect to loss or damage caused by the use of these DIMMs. Table 1. 2 Recommended DIMMs Manufacturer Capacity Model Melco Inc. 16 MB PM-HP-16M-KC 32 MB PM-HP-32M-KC 64 MB PM-HP-64M-KC 128 MB PM-HP-128M-KC FS-6750...

  • Page 11: Memory Card (Compactflash)

    Availability of the following memory cards (CompactFlash), manufac- turers, and specifications may change without notice. No responsibil- ity is assumed by kyocera Mita with respect to loss or damage caused by the use of these memory card. Table 1. 3 Recommended Memory cards—1/2...

  • Page 12: Hard Disk (Microdrive)

    32 MB 48 MB 64 MB 80 MB Hard disk (Microdrive) The following hard disk is available for the printer. Table 1. 4 Recommended hard disk (Microdrive) Manufacturer Capacity Model 340 MB DMDM-10340 512 MB DSCM-10592 1 GB DSCM-11000 FS-6750...

  • Page 13: Front And Internal Views

    I N F O R M A T I O N Front and internal views Front and internal views Paper ejection roller Front operator panel Feed unit release lever Power switch Toner bottle/drum Paper cassette access door MP tray Feed unit Feed unit release lever Memory card slot FS-6750...

  • Page 14: Internal Component

    I N F O R M A T I O N Front and internal views Internal Component Laser scanner unit Paper ejection roller Top cover safety lock Liaison board Upper unit ventilation fan Main motor manual feed actuator Memory card slot Regist. roller clutch Feed roller clutch FS-6750...
  • Page 15 I N F O R M A T I O N Front and internal views Laser scanner unit Rear cover High-voltage board Face-up paper ejection slot Main charger unit Serial interface YC13 Drum unit Parallel interface YC02 AC power receptacle Power switch FS-6750...

  • Page 16: Safety Information

    Laser printers generate ozone gas (O ) which may concentrate in the place of installation and cause an unpleasant smell. To minimize the concentration of ozone gas, we recommend that the laser printer not be installed in a confined area lack- ing ventilation. 1-10 FS-6750...

  • Page 17: Installation

    Provide a sufficient clearances around the printer to ensure ventilation and ease of access. See below. Clearance Allow the necesary minimum clearance on all sides of the printer (below). 30 cm 30 cm 50 cm 60 cm 25 cm FS-6750 1-11...

  • Page 18: Places To Avoid

    To avoid possible electrical shock, extreme caution must be exercised in han- dling the power cord and any other electrical part. Warning As the disconnect device is not incorporated in the printer's AC pri- mary circuit, an easily accessible socket outlet must be provided near the equipment. 1-12 FS-6750...

  • Page 19: About The Toner

    To loosen and mix the toner inside, with the label side down, thoroughly shake the toner container (in the direction of the arrow) ten times or more. Warning Do not attempt to disassemble or refill the toner container. FS-6750 1-13...

  • Page 20: Toner Storage

    Caution If the printer is shipped for return, etc., do not ship it with the toner container installed. Otherwise, toner may leak and contamination may result in the printer. 1-14 FS-6750...
  • Page 21 Chapter 2 I N S T A L L A T I O N 2.1 Unpacking, page 2- 2 2.2 Installing toner, page 2- 3 Installing the waste toner bottle, page 2-5 2.3 Developer initialization, page 2- 6 2.4 Expanding memory, page 2- 7 Minimum memory requirements, page 2-7 DIMM to be used, page 2-7 Notes on handling the main circuit board and DIMM, page 2-8...

  • Page 22: Unpacking

    Unpacking The following diagrams show how to unpack the printer in the shipping carton. While unpacking the printer, check that the parts shown below are all present. Manuals Power cable Waste FS-6750 tonner printer bottle Toner kit (TK-26/ CTK-45) Fillers...

  • Page 23: Installing Toner

    Take the toner container from the toner kit (TK-26 for Taiwan/CTK-45 for Korea) supplied with the printer. Give it a good shake (10 times or more). Peel off the seal on the bottom of the toner container by carefully pulling off. FS-6750...
  • Page 24 To avoid trouble (toner spilling, etc.), the toner container must be cor- rectly seated and locked in the printer. To do this, press the far side of the container at the left and right PUSH HERE marks until a click is heard. FS-6750...

  • Page 25: Installing The Waste Toner Bottle

    Installing the waste toner bottle The waste toner bottle is also supplied. It must be installed inside the drum access door in the left side of the printer. Open the drum access door and install it as shown. Waste toner bottle FS-6750...

  • Page 26: Developer Initialization

    Refer to the section , page 3-11 3.5 Initializing the developer If developer initialization is not to be performed, turn on power while pressing cas- sette size sensors 1 to 3. See , page 6-26. Checking cassette size sensors FS-6750...

  • Page 27: Expanding Memory

    = ON DIMM to be used Table 2. 2 DIMM to be used Memory size in MB 16, 32, 64, 128 MB Number of pins 100 pins Access speed 66 MHz Parity None Bus width 32 bits FS-6750...

  • Page 28: Notes On Handling The Main Circuit Board And Dimm

    While doing the work, it is rec- ommended that you wear an antistatic wrist strap. • Touch the main circuit board and DIMM only by the edges, not in the middle. • Follow the instructions the DIMM manufacturer provides. FS-6750...

  • Page 29: Installing The Dimm

    Remove the memory card (CompactFlash) that may be inserted in the memory card slot at the right side of the printer. Remove the main board (1) by removing the five (plated) screws (2) . Pull the main board (1) all the way out of the printer. FS-6750...

  • Page 30: Testing The Expansion Memory

    To test the expansion memory, turn printer power on and print a status page. If the installation has been successful, the Available Memory item of the status page will show the expanded memory size corresponding to the amount of memory added. 2-10 FS-6750...

  • Page 31: Installing The Option Hard Disk (Microdrive)

    Turn the power switch off. Remove the main board (1) from the printer. (See step 2 to 4, on page 2-13.) Install the hard disk (2) to the hard disk slot (3) . FS-6750 2-11...

  • Page 32: Installing The Option Memory Card (Compactflash)

    Turn the power switch off. Insert the memory card (1) in the memory card slot (2) at the right bottom of the printer. Insert it face up, connector end first. Push it in all the way. 2-12 FS-6750...

  • Page 33: Installing The Option Network Interface Card

    Fix the network interface card (3) by two screws (1) . Connect the network cable (5) to the network interface card (3) . Set the network address from the printer operator panel. (Refer to the printer’s User’s Manual) " FS-6750 2-13...

  • Page 34: Using The Operator Panel

    3 ATTENTION indicator Flashing The printer needs maintenance attention or the printer is warming up ( Please wait ). A problem or an error has occurred that the user can clear, for example, paper jam. Operations are normal. 2-14 FS-6750...
  • Page 35 Used as the > key in the menu selection. Displays on-line help messages on the message display when paper jam occur. When pressed in the Ready condition, displays on-line help messages. 11 ENTER key Finalizes numeric values and other selections in menu selection. FS-6750 2-15...

  • Page 36: Interface Indicator

    Japanese postcard (10 × 14.8 cm) * Monarch (3-7/8 × 7-1/2 inches) * Return postcard (20 × 14.8 cm) * Business (4-1/8 inches) * Custom size (14.8 × 21 cm to 21.6 × 35.6 cm) * with only the MP tray feeding 2-16 FS-6750...

  • Page 37: Paper Type Indicator

    ROUGH Plain PLAIN Letterhead LETTERHEA Transparency* TRNSPRNCY Color COLOR Preprinted PREPRINTE Prepunched PREPUNCH Labels* LABELS Envelope* ENVELOPE Bond BOND Cardstock* CARDSTOCK Recycled RECYCLED Custom 1 (to 8) CUSTOM1(to 8) Vellum* VELLUM * with only the MP tray feeding FS-6750 2-17...

  • Page 38: Message Display

    (The time that it takes the printer to enter Sleep mode depends on the Sleep Timer setting.) Data inside the printer is being canceled. Cancelling data The printer prints the last page after a waiting period. FormFeed TimeOut 2-18 FS-6750...

  • Page 39: Menu Selection System

    >>Perm.Code JOB Size >TCP/IP > >>VMB Size >>DHCP Inter face > Parallel >>IP Address >Parallel I/F >>Subnet Mask Nibble (high) >Parallel I/F >>Gateway Auto >Parallel I/F >Ether Talk Normal >Parallel I/F >OPT. StatusPage High Speed Continued on next page. FS-6750 2-19...
  • Page 40 >CR Action Regular LF only >CR Action >Letter Gothic Regular CR and LF >CR Action >Letter Gothic Ignore CR Dark >Size >Wide A4 012.00 point(s) >Pitch >Wide A4 10.00 cpi >List of Internal Fonts Continued on next page. 2-20 FS-6750...
  • Page 41 >Read Data >List of Partitions Hard Disk > >Read Data >Write Data >Delete Data >List of Partitions RAM Disk Mode RAM Disk Mode >RAM Disk Size >Read Data >Write Data >Delete Data >List of Partitions Continued on next page. FS-6750 2-21...
  • Page 42 Extra Heavy >>Paper weight >Auto Continue Light (Thin) Mode Off >>Duplex Path >Service > Disable >>Duplex Path >>Print Enable Status Page >>Print Density >>Print Event Log >>Developer >Reset Type Adjust >>Drum LIFE Counters > >Total Print >New Toner Installed 2-22 FS-6750...
  • Page 43 Chapter 3 M A I N T E N A N C E 3.1 Life expectancy of modules, page 3-2 3.2 Toner container, page 3-3 When to replace the toner container, page 3-3 Notes on changing the toner container, page 3-3 Toner container replacement, page 3-4 Waste toner bottle, page 3-4 Toner saver mode (EcoPrint), page 3-4...
  • Page 44 User replaceable (Korea) DK-29 Drum unit 120,000 DV-27TW Developer unit 240,000 (Taiwan) DV-27CH Developer unit 240,000 (Korea) FK-29TW Fuser kit 240,000 (Taiwan) FK-29CH Fuser kit 240,000 (Korea) MK-29 Refurbishment kit 240,000 Includes a DK-29, DV-27TW/CH, FK-29TW/CH, and a feed-transfer unit. FS-6750...

  • Page 45: Toner Container

    Toner container The toner container is the only consumable that the printer requests replacement during normal operation (user-replaceable). The following toner container is avail- able for use with model FS-6750. Table 3. 2 Toner container Model No. of waste toner bottles included...

  • Page 46: Toner Container Replacement

    Print mode is factory-set to off and turned on by the printer’s operator panel (also accessible through the application software with the assistance of the printer driver). See details in the Mode Select Menu roadmap in chapter 2. The EcoPrint setting has no effect on the print speed. FS-6750...

  • Page 47: Cleaning The Printer

    To clean the main charger, first open the drum access door. Pull the cleaning knob (green) slowly in and out a few times. This pulls a cleaning pad inside the drum unit along the wire. Drum access door Cleaning knob (Green) FS-6750...
  • Page 48 When the grid cleaner is properly fit, grasp the green part of the main charger, lift it slightly, and pull outwards. Repeat the above for approx. five times. The wet part of the grid cleaner cleans the grid of the main charger unit (bottom). FS-6750...

  • Page 49: Paper Feed Unit

    Wipe the paper dust on the registration roller and the paper ramp using the wiper cloth included in the toner kit. Caution Do not touch the transfer roller (black sponge roller) when wiping the paper ramp. Registration roller FS-6750...
  • Page 50 Maintenance Cleaning the printer Take out the cleaning brush supplied with the printer. Clean the separation charger using the brush. Separation charger FS-6750...

  • Page 51: Handling The Developer Unit

    The printer is supplied with a developer container package that should be retained for future shipment of the developer. To pack the developer in the container package, first flap down the magnet roller protective cover, then refer to the diagram below: Magnet roller protect. cover FS-6750...
  • Page 52 Maintenance Handling the developer unit Insert the developer into the container as shown below. 3-10 FS-6750...

  • Page 53: Initializing The Developer

    15 minutes, after which the printer reverts to ready state. If developer initialization is not to be performed, turn on power while pressing cas- sette size sensors 1 to 3. See , page 6-26. Checking cassette size sensors FS-6750 3-11...

  • Page 54: Updating The Firmware

    System firmware file name example S81K7800.bcmp compression Boot program is included. Version code: Version 78.00 ID code for Kyocera Machine code: FS-6750 (A81) ID code for system firmware Engine firmware file name example E81KA001.x Void Version code: Version A001 ID code for Kyocera...

  • Page 55: Downloading Firmware Via The Parallel Interface

    >Copy /b E81KA001.x prn Downloading Supervisor mode Power switch: Off/On Ready Print a status page and check that the status page shows the new firmware version. If downloading is unsuccessful, an error message will appear. See Downloading , page 3-16. errors FS-6750 3-13...

  • Page 56: Downloading Firmware Using The Memory Card

    Message (2) is displayed during downloading. Confirm the display changes to Message (3) which indicates downloading is complete and turn printer power off, then on. Confirm Display (4) is displayed after warming up. Message display Downloading Supervisor mode Power switch: Off/On Ready 3-14 FS-6750...

  • Page 57: Downloading Message Data

    Downloading Supervisor mode Power switch: Off/On Ready Print a status page and check that the status page shows the new message data version. If downloading is unsuccessful, an error message will appear. See Downloading , page 3-16. errors FS-6750 3-15...

  • Page 58: Downloading Errors

    [##] the computer and the printer. ##: Error code 80, 81 or 85 Defective parallel cable Replace the parallel cable. Defective memory card (CompactFlash) Replace the memory card (CompactFlash). 3-16 FS-6750...
  • Page 59 Chapter 4 O P E R A T I O N T H E O R Y 4.1 Electrophotographics system, page 4-2 Electrophotographic system, page 4-2 OPC drum, page 4-2 Charging the drum, page 4-3 Toner, page 4-4 Exposure, page 4-4 Scanner unit, page 4-5 Scanning laser, page 4-7 Development, page 4-7...

  • Page 60: Electrophotographics System

    The printer uses the long-life OPC drum. This drum is composed of an aluminum tube as elementary tube on which various materials are stacked in layers for form- ing a photoconductor. A schematic diagram of a cross section of the drum is shown below. FS-6750...

  • Page 61: Charging The Drum

    Charging the drum is done by the main charger wire (in the main charger unit) marked “A” in the diagram. As the drum (“B” above) rotates in a “clean (neutral)” state, its photoconductive layer is given a uniform, positive (+) electrical charge dispersed by the main charger wire (“A”). FS-6750...

  • Page 62: Toner

    Single component toner TK-26/26E/CTK-45 A - Resin B - Ferrite C - Silica D - Polisher Exposure The charged surface of the drum (“B”) is then scanned by the laser beam from the scanner unit (“A”). FS-6750...

  • Page 63: Scanner Unit

    Positive chg. Aluminum Negative chg. Scanner unit The 600 dpi scanner unit includes the diode laser that produces the 780 nm wave- length laser beam. This wavelength is specifically designed to match the photocon- ductive response of the OPC drum. FS-6750...
  • Page 64 Bends the very first shot of a laser scan towards the beam detec- tion sensor (See next.). Beam detector sensor When shone by the sensor mirror above, this photosensor gener- ates a trigger signal for the engine controller to start activating the paper feeding system. FS-6750...

  • Page 65: Scanning Laser

    Toner attracts to the developing roller since it is pow-dery ink made of black resin bound to iron particles. A magnetized blade posi- tioned approximately 0.3 to 0.4 mm above the developing roller constitutes a smooth layer of toner in accordance with the roller revolution. FS-6750...

  • Page 66: Developing Roller Bias

    Dev. blade Dev. roller Toner Drum Toner sensor AC+DC Drum Dev. roller The following diagram depicts the change in the drum surface potential during development. The vertical distance rerepresents the depth of bias potential. FS-6750...

  • Page 67: Toner Sensor

    (“B” below). The transfer roller is negatively biased so that the positively charged toner is attracted onto the paper while it is pinched by the drum and the transfer roller. FS-6750...

  • Page 68: Fusing

    For safety against overheating, the fuser system is protected by a triac which automatically opens power to the halogen lamp. If the temperature ex-ceeds 350 °C, it activates the thermo-cut device to interrupt open power to the halo-gen lamp. 4-10 FS-6750...

  • Page 69: Drum Cleaning And Erasing Static Charge

    LED (“C” above) in the similar manner as described in page 4-6. This lowers the electrical conductivity of the drum surface making the re-sidual charge on the drum surface escape to the ground. FS-6750 4-11...

  • Page 70: Typical Photo Process Timing Chart

    The transfer bias is kept on during a print job (E). SPVDR (SeParation Vias DRive) Turns the separation charge bias on and off. The duration of SPVDR turned on (F) varies depending on the size of the page. SPVDR is off between pages (G). 4-12 FS-6750...

  • Page 71: Print Timing Charts

    The following charts show timings among those signals the engine controller issues to control printing. The charts include different timings depending on the paper sizes and paper sources. Figure 4.5 Main cassette/A5 or A4Y (Feed speed [FEDDR]=187.658 mm/s, Drum speed=93.067 mm/s) FS-6750 4-13...
  • Page 72 Operation theory Print timing charts Figure 4.6 Main cassette/A3 (Feed speed [FEDDR]=187.658 mm/s, Drum speed=93.067 mm/s) 4-14 FS-6750...
  • Page 73 Operation theory Print timing charts Figure 4.7 PF-26 feeder/A5 or A4Y (Feed speed [FEED1]=280.42 mm/s, Drum speed=93.067 mm/s) FS-6750 4-15...
  • Page 74 Operation theory Print timing charts Figure 4.8 PF-26 feeder/A3 (Feed speed [FEED1]=280.42 mm/s, Drum speed=93.067 mm/s) 4-16 FS-6750...
  • Page 75 Operation theory Print timing charts Figure 4.9 Second PF-26 feeder/A5 or A4Y (Feed speed [FEED2]=280.42 mm/s, Drum speed=93.067 mm/ FS-6750 4-17...
  • Page 76 Operation theory Print timing charts Figure 4.10 Second PF-26 feeder/A3 (Feed speed [FEED2]=280.42 mm/s, Drum speed=93.067 mm/s) 4-18 FS-6750...
  • Page 77 Operation theory Print timing charts Figure 4.11 MP tray/A5 or A4Y (Feed speed [MP]=173.223 mm/s, Drum speed=93.067 mm/s) FS-6750 4-19...
  • Page 78 Operation theory Print timing charts Figure 4.12 MP tray/A3 (Feed speed [MP]=173.223 mm/s, Drum speed=93.067 mm/s) 4-20 FS-6750...

  • Page 79: Paper Feeding System

    Regist. rollers+clutch+sensor Eject rollers Drum Separation charger Feed roller+ clutch+ sensor Fuser rollers Transfer roller Paper (Cassette) Following on the next page is another diagram showing locations of sensors, roller, and solenoids arranged along with this paper path. FS-6750 4-21...

  • Page 80: Cassette Feeding

    After 300 ms, the MPFCLH* signal is issued to rotate the feed roller and sends the paper towards the registration rollers. As the registration sensor detects the paper, the lift board lowers. The registration rollers pulls and sends the paper forwards for development. 4-22 FS-6750...

  • Page 81: Paper Jam Sensing

    The printer reverts to normal operation when the top cover or the paper feed unit is once opened and closed after removal of jam. If the paper was jammed clearing the eject sensor, the printer does not print the same page when recovered. FS-6750 4-23...

  • Page 82: Basic Engine Functions

    Interface Laser Circuit Diode Engine Controller Polygon Mirror Developer Unit Tonner Drum Unit Container Main Charger Multipurpose Fuser Unit Tray Heat Roller Face-up Stack OPC Drum Developer Roller Transfer Roller Paper Feed Unit Paper Feed Roller Paper Cassette 4-24 FS-6750...

  • Page 83: Engine Controller System

    If the horizontal synchronization output is not found after the laser driving current control (LASER*) is set low, the engine CPV recognizes it as the failure on the APC board and gives the 4200 error. FS-6750 4-25...

  • Page 84: Safety Interlock

    Figure 4.15 Interlock system Top cover switch Left cover switch Polygon mot. +24VDC +24VDC Engine 3-term. regulat. +5VDC Top cover switch Left cover switch 4-26 FS-6750...

  • Page 85: The Engine Gate Array

    Side cover Power terminal (Ground) RSVIO1 IN/OUT General-purpose input/output terminal 1 Fixed low PAPER Cassette paper detection, H: Paper Cassette HANDS* MP tray paper detection, H: Paper MP tray unit TMOTON Toner motor on output, H: On Neg. Developer FS-6750 4-27...
  • Page 86 Scanner unit Sample POWCONT Not used Pos. PDIN* Pin photo detection input, L: Scanning Scanner unit VDFON2* Not used Pos. PDOUT* Pin photo detection input, L: Scanning Pos. Main I/F SYSRES* Controller reset output, L: Reset Pos. Main I/F 4-28 FS-6750...
  • Page 87 Engine CPU address/data bus IN/OUT Engine CPU address/data bus IN/OUT Engine CPU address/data bus IN/OUT Engine CPU address/data bus Power terminal (Ground) IN/OUT Engine CPU address/data bus IN/OUT Engine CPU address/data bus FANON* Printer fan on output, L: On Neg. FS-6750 4-29...
  • Page 88 Option unit select code 0 Pos. Option unit OPSEL1 Option unit select code 1 Pos. Option unit OPSEL2 Option unit select code 2 Pos. Option unit OPSEL3 Not used Pos. OPSEL4 Not used Pos. OPSEL5 Not used Pos. Power terminal 4-30 FS-6750...

  • Page 89: Power Supply

    Fuser heater power control—On the AC primary side, the fuser heater is wired in series across CN2. The heater is switched on and off as being controlled by TRIAC TRC1. TRC1 turns on the heater when HEATCOM (pin 8) at CN3 is energized by command from the engine controller. FS-6750 4-31...

  • Page 90: Logic Controller System

    Serial RS-232C/RS-422A (standard for Korea only) Option 1 slot Engine communication mode Serial interface Front panel com. mode Serial interface Others Smoothing KIR (Vector compensation) Toner savor EcoPrint [On/Off] Reduction Main and sub scan Video clock 44.8042 MHz 4-32 FS-6750...
  • Page 91 CDET1A, CDET1B, (CompactFlash) Board RSSEL STROBE, CFRST1, CFWAIT1 Centronics AUTOFD, Buffer INIT, P1284DIR +5 V +3.3 V KUIO YC02 +5 V +5 V YC13 +3.3 V +2.5 V Regulator Parallel Serial Regulator Regulator Interface Interface (For Korea only) FS-6750 4-33...

  • Page 92: Printing Data Processing

    The size of the RAM is expandable using comprehensive DIMMs. Table 4. 6 Main RAM Number of RAMs Socket Nos. U32, U33 Number of pins 42, TSOP Size 16 MB (Taiwan)/32 MB (Korea) Composition 2 MB (1 MB × 16 bits × 2) Access speed <80 ns 4-34 FS-6750...

  • Page 93: Memory Card/Hard Disk(Microdrive) Slot Interface

    System address 6 20 (B10) System address 5 21 (A11) System address 4 22 (B11) System address 3 23 (A12) System address 2 24 (B12) System address 1 25 (A13) — — 26 (B13) +3.3 V — — FS-6750 4-35...

  • Page 94: Parallel Interface

    The parallel interface supports the protocols defined by the IEEE 1284 standards. To gain conformity to these standards, the printer supports the ECP and nibble modes. Details on the signals on the parallel interface are described in the appropriate ap- pendix in this manual. 4-36 FS-6750...

  • Page 95: Serial Interface

    Table 4. 10 Engine interface connector assignment— Pin No. Terminal Signal Pin No. Terminal Signal SDIR SDIR SCLK SCLK ENGIR ENGIR* SBSY SBSY VDFON VDFON RESET RSTIN PDOUT VDATAP VDOUTP VDATAN VDOUTN FPDIR FPDIR 3.3 V 3.3 V FPCLK FPCLK FPDAT FPDAT FS-6750 4-37...

  • Page 96: Signals Used For The Engine Interface

    ENGIR ENGine High When the status of the engine system changes and the Interrupt controller must be immediately informed of the Request change, this signal will become low for certain period and then return to the high level. 4-38 FS-6750...
  • Page 97 Chapter 5 D I S A S S E M B L Y 5.1 General Instructions, page 5-2 Screws/hardware, page 5-2 5.2 Disassembly: Main unit printer, page 5-3 Removing the developer unit, page 5-3 Shipping the developer unit, page 5-4 Installing a new developer, page 5-4 Removing the paper feed unit, page 5-5 Removing the transfer roller, page 5-6...

  • Page 98: General Instructions

    Caution To secure a self-tapping screws, align it with the thread carefully. First turn it counterclockwise, then slowly clockwise. Do not over-tighten. In case the selftapped thread is damaged, the affected part must be replaced with a new part. FS-6750...

  • Page 99: Disassembly: Main Unit Printer

    Toner container Release lever After removing the toner container, remove the developer’s connector from the printer. Then, while pressing the developer release lever towards the front of the printer, remove the developer unit. FS-6750...

  • Page 100: Shipping The Developer Unit

    First, flap the magnet roller protective cover down. Put the developer unit in the plastic bag supplied with the shipping container. Put the developer unit into the shipping container. Installing a new developer Use a developer unit DV-27TW/DV-27CH for replacement. Produce the developer unit from the protective bag. FS-6750...

  • Page 101: Removing The Paper Feed Unit

    Locking tab 1. The protective cover is not provided with the developer unit that is originally supplied with the printer. FS-6750...

  • Page 102: Removing The Transfer Roller

    Thoroughly clean the entire surface of the roller. Rreplacing the transfer roller Carefully clean the left side (facing the front of the paper feed unit) axle end before replacing the transfer roller. This end of the axle is directly applied with the high voltage transfer bias. FS-6750...

  • Page 103: Removing The Registration Rollers

    Remove the registration rollers cover. The cover is locked by two catches that lock it onto the paper feed unit. These catches can be accessed through the holes on the cover. Insert a screw driver as shown below and release the locks. FS-6750...

  • Page 104: Removing The Drum Unit

    Do not attempt to forcibly pull out the drum without first having done all of these procedures. 3—Remove the developer unit. 1—Remove this screw and pull out the drum unit. 2—Draw the feed unit half way out. FS-6750...

  • Page 105: Replacing The Drum Unit

    Pull the main charger until it stops. While pushing the (white) locking peg in- wards the printer, pull the main charger unit all the way out. The main charger unit is explained on page 3-5, in chapter 3. Main charger unit Lock peg Main charger unit FS-6750...

  • Page 106: Top Side Cover

    Then, free the catches at the bottom by lowering the top side of the cover downwards. Right cover Left cover 5-10 FS-6750...
  • Page 107 Then, free the catches at the bottom by lowering the top side of the cover downwards. Left cover – FS-6750 5-11...

  • Page 108: Removing Front Cover

    To disengage these catches, proceed to the next step. Remove the ground wire Ê and the connector below. Disengage the catches at the left and right (shown) bottom of the cover. – 5-12 FS-6750...

  • Page 109: Removing The Main Motor

    Ê. Then, remove the connector. – – Removing the drive assembly Remove the right side cover first (page 5-10, ). Remove the five Removing covers screws Ê. Remove the connectors . Remove the drive assembly. – – FS-6750 5-13...

  • Page 110: Removing The Fuser Unit

    The heater is extremely hot immediately after the printer was run- ning. Allow substantial period of time until it cools down. Also, the heater is fragile: Handle it with great care. Remove the two screws Ê. Remove the cover from the fuser unit. 5-14 FS-6750...

  • Page 111: Installing The Fuser Roller

    To remove the heat (metal) roller, first remove “plate fuser up” by using a small flat-blade screwdriver as shown below. Note Special care should be taken not to let the screwdriver go too far into the hole. Such an action can irrevocably damage the roller surface. FS-6750 5-15...

  • Page 112: Removing The Thermistor And Thermal Cutout

    Disassembly Disassembly: Main unit printer Heat roller plate fuser up Removing the thermistor and thermal cutout Thermistor Thermal cutout 5-16 FS-6750...

  • Page 113: Replacing The Heat Roller

    • page 5-3, Removing the developer unit • page 5-8, Removing the drum unit • page 5-10, Top side cover • page 5-10, Removing covers • page 5-12, Removing front cover FS-6750 5-17...
  • Page 114 Disassembly Disassembly: Main unit printer Remove the screw Ê below. – Remove the high-voltage board at the left side of the printer. To do this, remove the three screws Ê. Disengage the connectors. 5-18 FS-6750...
  • Page 115 Disassembly Disassembly: Main unit printer Remove the two screws Ê at the left side of the printer. Disengage the connectors. Remove the two screws Ê on the front side. Hold the upper frame and lift to remove. – FS-6750 5-19...

  • Page 116: Removing The Face-Down Pulley Assembly

    On the controller box, remove the six screws Ê on top and one screw at the rear side. Remove the cover. Removing the face-down pulley assembly Remove the screw Ê to remove the face-down pulley assembly. Face-down assembly 5-20 FS-6750...

  • Page 117: Disassembly: Option Paper Feeder

    Disassembly Disassembly: Option paper feeder Disassembly: Option paper feeder This section describes instructions on how to disassemble the option paper feeder PF-26 for the FS-6750 printer. Before proceeding; • Disconnect power from the printer • Remove the printer (and the duplexer if installed).

  • Page 118: Removing The Top Cover

    Remove the drive roller by unlatching it both ends and then the top cover. – Removing the motor assembly To remove the motor assembly, remove the two screws Ê atop that secure the motor bracket and the one screw at the bottom. 5-22 FS-6750...
  • Page 119 Disassembly Disassembly: Option paper feeder Disengage the connectors. The following picture shows the motor assembly and the gears mounted on the motor bracket. FS-6750 5-23...
  • Page 120 Disassembly Disassembly: Option paper feeder This page left blank intentionally 5-24 FS-6750...
  • Page 121 Chapter 6 T R O U B L E S H O O T I N G 6.1 Board layouts, page 6-2 Liaison board KP-908, page 6-2 Scanner interface board KP-697, page 6-3 Connect board connector/KP-910, page 6-3 Fuser board KP-499/YC-721, page 6-4 6.2 Overall wiring diagram, page 6-5 6.3 General error handling, page 6-6 Maintenance messages, page 6-6...

  • Page 122: Board Layouts

    Connected to: Check points above Fan (large) — Main motor E1, pin 3 (MOTOR*)/pin 1 (+24V) Registration clutch — Engine board KP-910/CN14 Feed clutch — Manual feed clutch — Cassette detect switch — Front panel — Manual feed solenoid — FS-6750...

  • Page 123: Scanner Interface Board

    PLCLK POLRDY POLON +24V Connect board connector/KP-910 The two connectors at the right side of the printer are mounted on the connect board. These connectors derive engine signals. For pin assignments, refer to , page 6-5. Overall wiring diagram FS-6750...

  • Page 124: Fuser Board

    Troubleshooting Board layouts CN13(レ ーザス キャ ナへ) CN13 (for laser scanner unit) CN14 (for KP-908 board) CN14 (KP620 へ) Fuser board KP-499/YC-721 Table 6. 3 YC-721 Pin No. Signal FCUP* +24V FDOWN* PAPFL* THERM* EXITJ* FS-6750...

  • Page 125: Overall Wiring Diagram

    Troubleshooting Overall wiring diagram Overall wiring diagram FS-6750...

  • Page 126: General Error Handling

    GO key. After selecting a paper source and pressing the MENU key, Paper Handling > appears. By pressing the > key, the paper type setting menu appears. After setting the correct paper type, press the ENTER key and printing starts. FS-6750...
  • Page 127 Print a status page to see how low memory much user memory is left, and try deleting unnecessary fonts and macros. : Alarm buzzer sounds when an error occurs. Press the CANCEL key to stop the alarm buzzer. FS-6750...

  • Page 128: Error Messages

    The ID entered for a private job, or a stored job is not cor- ID error rect. Check the ID that is set using the printer driver. FS-6750...
  • Page 129 The data trans- ferred to the printer was too complex to print on a page. FS-6750...
  • Page 130 The storage area for the VMB is full. Purge accumulated Virtual mail VMB data by printing or deleting them. box fail : Alarm buzzer sounds when an error occurs. Press the CANCEL key to stop the alarm buzzer. 6-10 FS-6750...

  • Page 131: Diagnostic

    The number of printed sheets is dis- placed after this. A communication error between the main board and the Call service front panel board has occurred. personF0 Follow the appropriate instructions provided in the following sections. FS-6750 6-11...

  • Page 132: 0420-Option Paper Feeder Pf-26 Communication Error

    (S02450) between engine board and option unit interface connector. • Improper insertion of a Remedy. connector between printer and option duplexer DU- • Defective paper feeder Replace option paper feeder PF-26 in installation of PF-26. option paper feeder PF- 6-12 FS-6750...

  • Page 133: 2000-Main Motor Error

    Replace the connect board output from the engine board (KP-910). (KP-910). to the laser scanner unit and the VDFON1* signal has • Defective harness Replace harness. been output to the main between connect board board. and laser scanner unit. FS-6750 6-13...

  • Page 134: 5300-Eraser Disconnection Detection

    The engine board has • Defective engine board Replace the engine board detected an abnormal tem- (KP-904). (KP-904). perature of thermistor. • Defective thermistor. Replace the fuser unit. • Defective power supply Replace the power supply unit. unit. 6-14 FS-6750...

  • Page 135: 7001-Toner Motor Error

    893] and main board (KP- 903). • Defective front panel. Replace the front panel. • Defective harness Replace harness (S02258). (S02258) between connect board and relay board. • Defective harness Replace harness (S02801). (S02801) between relay board and front panel. FS-6750 6-15...

  • Page 136: F010-System Dimm [Board] Error

    CPU U201 of engine board • Defective engine board Replace the engine board could not write data failed to (KP-904). (KP-904). flash ROM U202. Write sequence to flash ROM is not successful. (Written data does not match the original data.) 6-16 FS-6750...

  • Page 137: F080-Engine Board Flash Rom Error

    • Defective engine board Replace the engine board (KP-904). (KP-904). • Defective main board (KP- Replace the main board (KP- 903). 903). • Defective downloaded Write the correct down- data. loaded data to the memory card (CompactFlash). FS-6750 6-17...

  • Page 138: False Error-Feed Unit Cover Open

    Troubleshooting Diagnostic False error—Feed unit cover open Figure 6.1 False error—Feed unit cover open False error [Feed unit cover open] Connect tester to #10 of CN1 on KP-628. Is # 10 (FCOVER) low? Replace KP-904 board. Replace KP-904. 6-18 FS-6750...
  • Page 139 Diagnostic Figure 6.2 Falser error—Top cover open False error [Top cover open] Is #11 (TCOVER) of CN1 on KP-628 low? Replace KP-628 board. Connect tester to #11 of CN22 on KP-904. Is #11 low? Replace KP-628. Replace KP-904. FS-6750 6-19...
  • Page 140 Diagnostic Figure 6.3 False error—Side cover open False error [Side cover open] Is #1 (SCOVER) of CN1 on KP-628 low? Replace KP-628 board. Connect tester to #1 of CN22 on KP-904. Is #1 low? Replace KP-628. Replace KP-904. 6-20 FS-6750...
  • Page 141 Figure 6.4 False error—Missing waste toner bottle False error [Missing waste toner bottle] Is #4 (TNCON*) of CN1 on KP-628 low? Replace KP-628 board. Connect tester to #4 of CN22 on KP-904. Is #4 low? Replace KP-628. Replace KP-904. FS-6750 6-21...

  • Page 142: Print Quality Problems

    • Check the high voltage output on the high voltage unit. at the high voltage unit. Replace the high voltage unit if high voltage potential is not available on the board. Defective main board [KP- • Replace the main board [KP-903]. 903]. 6-22 FS-6750...

  • Page 143: Dropouts, Horizontal Streak, Black Dots

    • A streak of toner remaining on drum after printing streak of toner laying length- means that the cleaning blade (in the drum unit) is not wise. working properly. Replace the drum unit. Defective magnet roller (in • Replace the developer. the developer). FS-6750 6-23...

  • Page 144: Unsharp Printing

    • If a developer which is known to work normally is avail- developer) may be defective. able for check, replace the current developer in the printer with the normal one. If the symptom disappears, replace the developer with a new one. 6-24 FS-6750...

  • Page 145: Dirt On The Top Edge Or Back Of The Paper

    • Check driver setting. If using Prescribe commands, tion review that the proper syntax is followed. Check the paper size sensor • Check switches on KP-904 and KP-910 boards. Refer to in the paper cassette. the following section. FS-6750 6-25...

  • Page 146: Checking Cassette Size Sensors

    4 (Letter) 4 (A4) 1 2 3 Front side Table 6. 24 Papser size matrix Switch ID (See above.) Paper size Ê Ë Ì Í Letter L Legal size Ledger No cassette Release of devel- oper initialization 6-26 FS-6750...

  • Page 147: Drum Cleaning

    First occurrence of defect [38 mm] Upper registration roller [39 mm] Developing roller (Developer) [51 mm] Lower registration roller [70 mm] Transfer roller [79 mm] Press roller (Fuser unit) [94 mm] Heat roller (Fuser unit) [126 mm] Drum (Drum unit) FS-6750 6-27...

  • Page 148: Troubleshooting Print Quality Problems

    Troubleshooting Print quality problems This page left blank intentionally 6-28 FS-6750...
  • Page 149 Appendix A P R I N T E R I N T E R F A C E A.1 Parallel interface, page A-2 Port pin assignment, page A-2 Parallel interface connection, page A-2 A.2 Serial interface, page A-4 Serial interface specifications, page A-4 Data error information (Snn), page A-5 Changing the serial interface configuration, page A-5 Serial port pin assignment, page A-6...

  • Page 150: Parallel Interface

    Data 0 [1] to Data 7 [8] 2-9 These eight signals form the data byte sent from the host computer to the printer. Data 7 [8] is the most significant bit and Data 0 [1] is the least significant bit. FS-6750...
  • Page 151 This signal is high when the printer’s power is on. Select In [NSelectIn] This signal is used in some versions of the Centronics interface to enable the computer to force the printer on- line. In high-speed mode, it is used as an interrupt. FS-6750...

  • Page 152: Serial Interface

    Control & Robust Off (10), Error Control & Robust On (11) Status send ^C, ^T, Esc.B, Esc. †. The serial interface mode currently engaged is indicated at the bottom of the service status page as: RS2=RS-232C mode, RS4=RS-422C mode. FS-6750...

  • Page 153: Data Error Information (Snn)

    Refer to chapter 2 and remove the main board out of the printer. Locate the jumper connector. To change the serial protocol from RS-232C to RS-422A, for example, carefully remove the jumper connector from the interface card, and reconnect to the pin posi- tion shown in the diagram. FS-6750...

  • Page 154: Serial Port Pin Assignment

    In RS-422A, this carries the inversed differential data (RDA). This output is always held high (above 3 V). CTS/DSR Unused. All signals can transmit between the printer and the host computer to send each signals with a signal ground. FS-6750...

  • Page 155: Rs-232C Interface Voltage Levels

    (last) below. RS-232C—for computers with a DB-9 connector Computer Printer serial port serial port (DB-9) (DB-25) RXD-2 2-TXD TXD-3 3-RXD DTR-4 4-RTS GND-5 5-CTS DSR-6 6-DSR RTS-7 7-SG CTS-8 20-DTR RS-232C—for computers with a DB-25 connector FS-6750...

  • Page 156: Rs-232C Protocol

    The serial interface supports the full baud rates of: 300, 600, 1,200, 2,400, 4,800, 9,600, and 19,200, 38,400, 57,600, and 115.2 k (bps). For adjusting serial interface parameters including baud rate, parity, etc., refer to the printer’s user’s Manual. FS-6750...
  • Page 157 Appendix B S T A T U S P A G E B.1 Status page, page B-2 Printing the service status page, page B-2 Service information on the status page, page B-2 Details of service information, page B-3...
  • Page 158 An example of the service status page is shown below. (Note the details born by a status page may differ from a firmware version to another.) Most of the service information is located under Service information. Most of these service information on the status page are alphanumerically-coded. Each item is explained next page. FS-6750...
  • Page 159 Details of service information Controller firmware version Released date of the firmware Software version: 81.01 Released: 31/Oct/2001 Service information [0104/A003][C1][22. 00AFUB][03/03] Total page 9690 /t/P00/S00/F00/N00/D10:DM0301.DAN/ /0020/0020/1061/0811/ /AAAAAAA/AAAAAAA/AAAAAAA/ /AAAAAAA/ DN:SPL9200007 SN:SPL9200010 Service information FS-6750...
  • Page 160 1= Overrun, bit 2= Parity error Operator panel lock (Shown 01= Partially locked F00/ only during locking) 02= Fully locked 10 N00/ NVRAM error (Shown only 01= ID error, 02= Version error, 03= Checksum iferror has occurred) error,04= NVRAM crash error FS-6750...
  • Page 161 00000000/03030303/ 03030303/ 26 SP 1 0203040 ..SPD (slot1) When “ ” is displayed for all, a bus error has occurred. Serial number for the drum N SP 920000 28 SN SP 9200010 Serial number for the printer - FS-6750...

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