Kyocera FS-1900 Service Manual
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Laser printer
SERVICE
MANUAL
Published in Dec. '01
Revision 1.1

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Summary of Contents for Kyocera FS-1900

  • Page 1: Service Manual

    Laser printer SERVICE MANUAL Published in Dec. ’01 Revision 1.1...
  • Page 2 Revision history Version Date Replaced pages Remarks 5-Dec-2001 17-Dec-2001 1-4, 1-5, 2-10, 2-20, 2-23, 3-3, 3-17, 4-23, 4-26, 5-24, B-4, B-5, C-7...
  • Page 3: Safety Precautions

    Safety precautions This booklet provides safety warnings and precautions for our service personnel to ensure the safety of their customers, their machines as well as themselves during maintenance activities. Service personnel are advised to read this booklet carefully to familiarize themselves with the warnings and precautions described here before engaging in maintenance activities.
  • Page 4 Safety warnings and precautions Various symbols are used to protect our service personnel and customers from physical danger and to prevent damage to their property. These symbols are described below: DANGER: High risk of serious bodily injury or death may result from insufficient attention to or incorrect compliance with warning messages using this symbol.
  • Page 5: Installation Precautions

    1. Installation Precautions WARNING • Do not use a power supply with a voltage other than that specified. Avoid multiple connections to one outlet: they may cause fire or electric shock. When using an extension cable, always check that it is adequate for the rated current..................... •...
  • Page 6: Precautions For Maintenance

    2. Precautions for Maintenance WARNING • Always remove the power plug from the wall outlet before starting machine disassembly....• Always follow the procedures for maintenance described in the service manual and other related brochures............................• Under no circumstances attempt to bypass or disable safety features including safety mechanisms and protective circuits.
  • Page 7 • Do not pull on the AC power cord or connector wires on high-voltage components when removing them; always hold the plug itself....................... • Do not route the power cable where it may be stood on or trapped. If necessary, protect it with a cable cover or other appropriate item.
  • Page 8: Table Of Contents

    Contents Chapter 1 1-1 Printer specifications ............................1-3 1-2 Names of parts ..............................1-9 1-3 Safety information ............................1-10 1-4 Environmental requirements .......................... 1-13 1-5 About the toner container ..........................1-17 Chapter 2 2-1 Unpacking ................................ 2-3 2-2 Installing the printer ............................2-5 2-3 Using the operator panel ..........................
  • Page 9 P r o d u c t I n f o r m a t i o n Chapter 1...
  • Page 10 Chapter 1 Contents 1-1 Printer specifications ........................1-3 1-1-1 Specifications ..........................1-3 (1) Engine ............................1-3 (2) Controller ........................... 1-4 (3) Weight and dimensions ......................1-4 (4) Power requirements ........................1-5 (5) Environmental requirements ...................... 1-5 1-1-2 Available option memory/device ....................1-6 (1) Expansion memory (DIMM) .......................
  • Page 11: Printer Specifications

    19 pages/min. (Letter) Resolution Fast 1200 mode with KIR 600 dpi with KIR 300 dpi with KIR Smoothing KIR (Kyocera Image Refinement) First print (A4 or letter, 23 °C), Approximately 19 seconds or less depends on input data Warm-up time Power on: 16 seconds or less (23 °C )
  • Page 12: Controller

    PCL6, Diablo 630, IBM proprinter X24E, Epson LQ850, Line printer, KPDL (3) Weight and dimensions Item Description Main unit Width: 34.5 cm (13-9/16 inches) (excluding Height: 30.0 cm (11-13/16 inches) protrusions) Depth: 39.0 cm (18-1/4 inches) Weight: 13 Kg (28-5/8 lb.) ( ): U.S.A FS-1900...
  • Page 13: Power Requirements

    Operating temperature and 10 to 32.5 °C (50 to 90.5 °F), 20 to 80 %RH humidity Maximum altitude 2,000 m (6,500 feet) Noise emission (Excluding Maximum: 53 dB(A) peaks, measured at 1 m from Standby: 35 dB(A) printer, as per ISO7779) FS-1900...
  • Page 14: Available Option Memory/Device

    Availability of the following memory DIMMs, manufacturers, and specifications may change without notice. No responsibility is assumed by Kyocera Mita with respect to loss or damage caused by the use of these DIMMs. Only the following DIMMs are certified the for use with the printer.
  • Page 15: Memory Card (Compactflash)

    (CompactFlash) on page 2-15. NOTE Availability of the following memory cards (CompactFlash), manufacturers, and specifications may change without notice. No responsibility is assumed by kyocera Mita with respect to loss or damage caused by the use of these memory card. Manufacturer Capacity...
  • Page 16: Hard Disk (Microdrive)

    96 MB SST48CF096 LEXAR Media 16 MB 32 MB 48 MB 64 MB 80 MB (3) Hard disk (Microdrive) The following hard disk is available for the printer: Manufacturer Capacity Model 340 MB DMDM-10340 512 MB DSCM-10512 1 GB DSCM-11000 FS-1900...
  • Page 17: Names Of Parts

    8 Paper size dial ^ Paper transfer unit release lever ¤ Option unit connector 9 Waste toner box & MP tray ‹ Network interface card (option) 0 Left cover * Rear cover or serial interface board (option) Figure 1-2-1 Name of parts FS-1900...
  • Page 18: Safety Information

    Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. This label is affixed atop of the laser scanner unit inside the printer. European countries U.S.A/Canada Figure 1-3-1 Caution labels FS-1900 1-10...
  • Page 19: Ozone Concentration

    Manufacturer's address: 704-19 Nojino, Tamaki-Cho, Watarai-Gun, Mie-Ken 519-0497, Japan declares that the product Product name: Page Printer Model number: FS-1900 (as tested with the enhancement optional unit: PF-60, DU-60, and SO-60) Conforms to the following product specifications. EN 55 022:1998 Class B...
  • Page 20 Model number: FS-1900 (as tested with the enhancement optional units: PF-60, DU-60, and SO- Description of device: This page printer model FS-1900 is the 18 ppm; A4 size and utilized plane paper; laser; dry toner etc. The printer can be equipped with several enhancement optional units as a paper feeder as PF-60, a duplexer as DU-60, a sorter as SO-60 etc.
  • Page 21: Environmental Requirements

    Environmental requirements in chapter 1, the best print quality may not be expected and there will be an increased chance of paper jams. • Provide a sufficient clearances around the printer to ensure ventilation and ease of access. (See section Clearance on next page). FS-1900 1-13...
  • Page 22: Clearance

    Allow the necessary minimum clearance on all sides of the printer as below. Figure 1-4-1 Clearances Ref. Clearance Dimensions [Minimum] Left 30 cm (11-13/16 inches) Front 60 cm (23-5/8 inches) Right 25 cm (9-7/8 inches) Back 20 cm (7-7/8 inches) Head room 30 cm (11-13/16 inches) FS-1900 1-14...
  • Page 23: Places To Avoid

    • An easily accessible socket outlet must be provided near the equipment. WARNING As the disconnect device is not incorporated in the printer’s AC primary circuit, an easily accessible socket outlet must be provided near the equipment. FS-1900 1-15...
  • Page 24: Removing The Printer

    • Before removing the printer to a warm place, wrap it in a blanket, etc., before crating it. Allow approximately two to three hours after having moved after uncrated. Failure to observe the above may result in moisture condensation which will affect the performance of the printer. FS-1900 1-16...
  • Page 25: About The Toner Container

    1-5 About the toner container 1-5-1 Toner container The printer should use a Kyocera TK-50 toner kit. To ensure the high print quality and long service life, the following handling precautions should apply: CAUTION As the Ecosys printers are designed to ensure the optimum print quality when used with Kyocera’s proprietary toner, Kyocera do not recommend to use any...
  • Page 26: Toner Container Storage

    If the printer is shipped for return, etc., do not ship it with the toner container installed. Remove the toner container from the developer and put in a plastic bag and seal the plastic bag. Otherwise, toner may leak and contamination may result in the printer. FS-1900 1-18...
  • Page 27 I n s t a l l a t i o n / O p e r a t i o n Chapter 2...
  • Page 28 Chapter 2 Contents 2-1 Unpacking ............................2-3 2-1-1 Unpacking and inspection ......................2-3 2-2 Installing the printer ........................2-5 2-2-1 Installing the toner container ..................... 2-5 Removing the toner container ......................2-7 2-2-2 Installing the waste toner box ....................2-8 Removing the waste toner box ......................
  • Page 29: Unpacking

    Then remove the spacer. Carefully remove the printer. Obtain help from other persons if necessary. Figure 2-1-1 Unpacking 1 Printer 5 Installation manual 2 Toner container 6 Kyocera digital library CD-ROM 3 Waste toner bottle 7 Plastic bag 4 Power cord FS-1900...
  • Page 30 1 Printer 5 Installation manual 2 Toner container 6 Kyocera digital library CD-ROM 3 Waste toner box 7 Plastic bag 4 Power cord Figure 2-1-2 List of shipped components FS-1900...
  • Page 31: Installing The Printer

    2. Take toner container 1 from the bag. With the label side down and pivoting on the middle of the container, thoroughly shake the toner container (in the direction of the arrows) ten times or more to loosen and mix the toner inside. Figure 2-2-1 Shake the toner container FS-1900...
  • Page 32 3. Carefully remove the protective seal 2. Figure 2-2-2 Removing the protective seal 4. Install the toner container 3 into the printer. Figure 2-2-3 Installing the toner container FS-1900...
  • Page 33: Removing The Toner Container

    To remove the toner container, pull the lock lever (green colored) 1 and gently lift the toner container. NOTE Do not remove the toner container unless you need to do so for servicing, etc. Figure- 2-2-4 Removing the toner container FS-1900...
  • Page 34: Installing The Waste Toner Box

    2. Open the left cover 3 and install the waste toner box 2 so that it is properly seated in the area under the drum unit. 3. Close the left cover 3. Figure 2-2-5 Installing the waste toner box FS-1900...
  • Page 35: Removing The Waste Toner Box

    To remove the waste toner box 1, while holding the waste toner box 1, press the lock lever 2 aside, then gently remove the waste toner box 1 sideways. NOTE Do not remove the waste toner box unless you need to do so for service, etc. Figure 2-2-6 Removing the waste toner box FS-1900...
  • Page 36: Expanding The Memory (Dimm)

    2-2-3 Expanding the memory (DIMM) The FS-1900 comes standard-equipped with 16 MB of main memory. The FS-1900 can be expanded up to the maximum of 144 MB (16 MB + 128 MB). Expansion should be done using optional DIMMs (Dual In-line Memory Module).
  • Page 37: Notes On Handling Dimm

    • While doing the work, it is recommended that you wear an antistatic wrist strap. • Touch the main board and DIMM only by the edges, not in the middle. Figure 2-2-7 Handling DIMM FS-1900 2-11...
  • Page 38: Installing The Dimm

    3. Remove the main board 2 by removing the two (plated) screws 3. 4. Pull the main board 2 all the way out of the printer. Figure 2-2-8 Removing the main board FS-1900 2-12...
  • Page 39: 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. FS-1900 2-13...
  • Page 40: Installing The Option Hard Disk (Microdrive)

    1. Turn the power switch off. 2. Remove the main board 1 from the printer. (See step 2 to 4, on page 2-12.) 3. Install the hard disk 2 to the hard disk slot 3. Figure 2-2-11 Installing the option hard disk FS-1900 2-14...
  • Page 41: Installing The Option Memory Card (Compactflash)

    2. 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. Figure 2-2-12 Installing the option memory card FS-1900 2-15...
  • Page 42: Installing The Option Network Interface Card

    4. Fix the network interface card 3 by two screws 1. 5. Connect the network cable 5 to the network interface card 3. 6. Set the network address from the printer operator panel. (Refer to the printer’s User’s Manual) Figure 2-2-13 Installing the option network interface card FS-1900 2-16...
  • Page 43: Installing The Option Serial Interface Board

    6. Connect the connectors of cable 7 between serial interface board connector 8 and main board connector (YC05 9). 7. Make sure that the serial interface board has been properly installed by printing out the printer’s status page. Figure 2-2-14 Installing the option serial interface board IB-10E FS-1900 2-17...
  • Page 44: Using The Operator Panel

    CompactFlash or Microdrive. 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. FS-1900 2-18...
  • Page 45 • Used as the > key in the menu selection. key) • Displays on-line help messages on the message display when paper jam occur. When pressed in the Ready condition, displays on-line help messages. ! ENTER key Finalizes numeric values and other selections in menu selection. FS-1900 2-19...
  • Page 46: Interface Indicator

    ISO C5 (16.2 × 22.9 cm) * Envelope [Youkei 4] (105 × 235 cm) * ISO B5 (17.6 × 25 cm) * Custom size (14.8 × 21 cm to 21.6 × 35.6 cm) * with only the MP tray feeding FS-1900 2-20...
  • Page 47: 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-1900 2-21...
  • Page 48: 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 Time Out FS-1900 2-22...
  • Page 49: Menu Selection System

    Size >TCP/IP > >>VMB Size Inter face > Parallel >>DHCP >Parallel I/F Nibble (high) >>IP Address >Parallel I/F Auto >>Subnet Mask >Parallel I/F Normal >>Gateway >Parallel I/F High Speed >Ether Talk Interface >OPT. StatusPage Continued on next page. FS-1900 2-23...
  • Page 50 Ignore CR >> I000 >Wide A4 >>Courier >Wide A4 Dark >>Courier Regular >>Letter Gothic Regular >>Letter Gothic Dark >>Size 012.00 point(s) >>Pitch 10.00 cpi >Alt. Emulation PCL6 >List of Internal Fonts >List of Option Fonts Continued on next page. FS-1900 2-24...
  • Page 51 600 dpi >Print Density 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-1900 2-25...
  • Page 52 Timer 000sec. >Type Adjust > >Auto Continue Custom 1 Mode Off >>Paper weight Normal >Service > >>Paper weight Heavy (Thick) >>Print >>Paper weight Status Page Light (Thin) >>Developer >>Duplex Path Disable >>Drum >>Duplex Path Enable >Reset Type Adjust FS-1900 2-26...
  • Page 53: Maintenance/Adjustments

    Maintenance/Adjustments Chapter 3...
  • Page 54 Chapter 3 Contents 3-1 Maintenance/Adjustments ......................3-3 3-1-1 Life expectancy of modules ....................... 3-3 3-1-2 Toner container .......................... 3-4 (1) When to replace the toner container ..................3-4 (2) Notes on changing the toner container..................3-4 (3) Toner container replacement ..................... 3-5 (4) Toner saver mode (EcoPrint) .....................
  • Page 55 Nominal life (pages) Toner container TK-50 10,000 Drum unit DK-63 300,000 Developer DV-62 300,000 Fuser unit FK-60 300,000 Main charger unit MC-60 300,000 Refurbishment kit MK-63 300,000 : User-replaceable : Includes DK, DV, and FK kits and a feed unit. FS-1900...
  • Page 56: Toner Container

    • Be sure to clean the parts as instructed in section 3-1-1 Cleaning the printer on page 3-8 at the same timing of replacing toner container. • Use of the Kyocera toner kit TK-50 is highly recommended for the optimum operation of the printer.
  • Page 57: Toner Container Replacement

    (3) Toner container replacement To replace the toner container, open the top cover. Pull the lock lever 1 to the right and gently lift the old container 2. Figure 3-1-1 Removing the old toner container FS-1900...
  • Page 58: Toner Saver Mode (Ecoprint)

    The EcoPrint enables to reduce the amount of toner consumed on the page so as to save printing costs by drastically extending the toner container life. EcoPrint mode is factory-set to off and turned on by using the menu system of the printer operator panel. For details, see the printer’s User’s Manual. FS-1900...
  • Page 59: Replacing The Waste Toner Box

    4 supplied before forwarding to proper disposal. Locate the new waste toner box in the toner kit, and install it in the printer according to section 2- 2-2 Installing the waste toner box on page 2-8. Figure 3-1-3 Removing the old waste toner box FS-1900...
  • Page 60: Cleaning The Printer

    The main charger unit should be cleaned in its two parts, the main charger wire and grid (See figure below.) whenever the toner container is changed. Cleaning of the main charger can be done without needing any tools thanks to its self-cleaning system. Cleaning pad Main charger wire Grid Shield Cleanig knob Figure 3-1-4 Main charger unit FS-1900...
  • Page 61: Cleaning The Main Charger Wire And Grid

    1. Open the left cover 1. 2. Pull the cleaning knob (green colored) 2 slowly in and out a few times. NOTE Cleaning knob pulls a cleaning pad inside the drum unit along the main charger wire. Figure 3-1-5 Cleaning the main charger wire FS-1900...
  • Page 62: Grid

    The grid cleaner pad is impregnated with water. Perform the following cleaning procedure before the pad dries. Figure 3-1-6 Grid cleaner 2. Attach the grid cleaner 1 to the drum unit 3 with the pad uppermost as shown in the diagram. Figure 3-1-7 Attaching the grid cleaner FS-1900 3-10...
  • Page 63 The grid part underneath the main charger is cleaned by the wet pad of the grid cleaner. Figure 3-1-8 Cleaning the grid 4. Remove the grid cleaner from the printer and dispose of it. The grid cleaner is not reusable. FS-1900 3-11...
  • Page 64: Paper Transfer Unit

    7, do not use alcohol to clean this area. If the oil is completely removed, an incorrect action of the MP tray paper sensor (8, actuator) will result. Figure 3-1-9 Cleaning the upper registration roller and the paper ramp FS-1900 3-12...
  • Page 65: Replacing The Developer

    To pack the developer 1 in the packing carton, first flap down the magnet roller protective cover 2. Put the developer 1 into the supplied plastic bag 3. Put the developer 1 on the developer install position 4 of packing carton. Figure 3-1-10 Shipping the developer FS-1900 3-13...
  • Page 66: Developer Initialization (Toner Install Mode)

    (See the figure above.), and turn power on. Let go off of the switches when the until message changes to Ready. FS-1900 3-14...
  • Page 67: Developer Refreshing Mode

    6 Print a page to check the print density. Print density (If the print density is too dark (gray background), change the “Print Density” setting in the menu selection to 1 or 2 steps lighter. (Default is 3.) Refer to printer’s User’s Manual for details. FS-1900 3-15...
  • Page 68: Drum Cleaning Mode

    Drum is cleaned by the cleaning blade in the drum unit. If paper is present on the MP tray, the drum is also cleaned by that the paper which is fed automatically and stops at the transfer roller. FS-1900 3-16...
  • Page 69: Updating The Firmware

    DIMM [board]. Masked type system DIMM [board] can not be overwritten. Check the type of the system DIMM [board] currently used on the main board by service status page [see page B-5]). System DIMM [board] Main board Figure 3-1-11 System DIMM [board] FS-1900 3-17...
  • Page 70: Firmware Program Data Format

    (1) Firmware program data format Kyocera supplies the following types of data for updating firmware of the different purposes: • System firmware • Engine firmware • Operator panel message data The data to be downloaded are supplied in the following format: System firmware file name example SB02K8400.bcmp...
  • Page 71: Downloading The Firmware From The Parallel Interface

    Power switch: On Message display Self test Ready PC display >ECHO !R!UPGR'SYS';EXIT;>PRN >Supervisor mode Parallel waiting >COPY/B SB02K8200.bcmp PRN >COPY/B EB02KA002.x01 PRN >COPY/B dm0201.spa PRN : System firmware : Engine firmware : Operator panel message data To the next page FS-1900 3-19...
  • Page 72 Confirm that the status page shows the new engine firmware, system firmware or operator panel message data version (See Appendix B on page B-4). If the message display indicates download error, refer to section Downloading errors on page 3-23. FS-1900 3-20...
  • Page 73: Downloading The Firmware From The Memory Card

    3 Turn power switch on. 4 The printer is automatically engaged in the supervisor mode. The parallel interface receives for the firmware data. Start Power switch: Off Memory card Power switch: On Message display Self test To the next page FS-1900 3-21...
  • Page 74: Remove The Memory Card

    Confirm that the status page shows the new engine firmware, system firmware or operator panel message data version (See Appendix B on page B-4). If the message display indicates download error, refer to section Downloading errors on page 3-23. FS-1900 3-22...
  • Page 75: Downloading Errors

    ’s interface error [##] connector. Defective LCD controller board Replace the LCD controller ##: Error code 70 or 77. board If the corrective action above does not solve the problem, replace engine board (KP-864). See page 5-22. FS-1900 3-23...
  • Page 76 O p e r a t i o n O v e r v i e w Chapter 4...
  • Page 77 Chapter 4 Contents 4-1 Electrophotographic system ......................4-3 4-1-1 Electrophotographic cycle ......................4-3 (1) Main charging ..........................4-4 Components of drum and main charger unit .................. 4-4 Amorphus-silicon drum ........................4-5 Charging the drum .......................... 4-6 (2) Exposure ........................... 4-7 Laser scanner unit ..........................
  • Page 78: Electrophotographic System

    The electrophotographic system of the printer performs a cyclic action made of six steps as follows. Each step is technically explained in the following sections. Drum unit Laser scanner unit Main charging Exposure Drum Cleaning Developer Developing Transfer Fusing Paper transfer unit Fuser unit Figure 4-1-1 Electrophotographic cycle FS-1900...
  • Page 79: Main Charging

    4 Waste toner full sensor [board] (KP-766) ! Main charger shield 5 Waste toner full sensor (receiver) @ Grid 6 Cleaning blade # Main charger wire 7 Cleaning roller $ Charger wire cleaner Figure 4-1-2 Components of drum and main charger unit FS-1900...
  • Page 80: Amorphus-Silicon Drum

    The carrier block layer lies between the amorphous silicon layer and the aluminum base cylinder and prevents the backward electron flow, from the base cylinder to the drum’s outer surface, which might give adverse effect (possibly “ghost”) on the print quality. FS-1900...
  • Page 81: Charging The Drum

    Due to being high-voltage scorotron charging, the main charger wire B can get contaminated by oxidization after a long run. Therefore, it must be cleaned periodically from time to time using the method explained in chapter 3, page 3-9. Cleaning the main charger wire B prevents print quality problems such as black streaks. FS-1900...
  • Page 82: Exposure

    A. Lenses D and diversion mirror E are housed in the laser scanner unit B. These lenses adjust the diameter of the laser beam (670 nm wavelength) so that the laser beam effectively focalizes on the drum A surface. FS-1900...
  • Page 83: Laser Scanner Unit

    Compensates the vertical angle at which the laser beam hits on of the polygon mirror segments. 4 Polygon motor Has six mirror segments around its hexagonal circumference. Each mirror corresponds to one scanned line width on the drum when the laser beam scans on it. FS-1900...
  • Page 84 (See figure 4-1-6). 0 Pin photo sensor When shone by the sensor mirror above, this pin photo sensor generates a trigger signal. Polygon mirror Laser diode Laser beam Primary f-theta lens Secondary f-theta lens Drum Figure 4-1-7 F-theta lens FS-1900...
  • Page 85: Drum Surface Potential

    Note that the area to be printed black has the low potential, constituting a “positively exposed” image. Laser beam Exposed surface potential approx. 0 to +20 V Charged surface potential approx. +240 V a-Si layer Drum Aluminum base Figure 4-1-8 Drum surface potential FS-1900 4-10...
  • Page 86: Development

    (3) Development Power train Toner container Developer 1 Toner motor 5 DLP B screw 2 Toner sensor 6 Blade 3 Developing roller 7 Magnet 4 DLP A screw Figure 4-1-9 Developer mechanism FS-1900 4-11...
  • Page 87 B is approximately 0.3 mm.) The non-exposed areas of the drum A repel the positively charged toner as these areas maintain the positive charge. The developing roller B is also AC-biased to ensure contrast in yielding by compensating the toner’s attraction and repelling action during development. FS-1900 4-12...
  • Page 88 Toner container Toner hopper Toner motor Sensable level Toner sensor Diaphragm Toner Developer Figure 4-1-11 Toner sensor FS-1900 4-13...
  • Page 89: Transfer

    The nominal transfer bias is set to approximately -2.3 kV (limit). Since the ideal potential of the transfer bias depends on the thickness of paper, the bias is raised to approximately -2.6 kV for thicker paper. On the other hand, the bias current is reduced to -2.1 kV for thin paper. FS-1900 4-14...
  • Page 90: Fusing

    The temperature of the heat roller A is constantly monitored by the engine board using the thermistor and triac. Should the temperature of the heat roller A exceed the predetermined value, the thermal cutout is activated to effectively disconnect the heater lamp C from power. FS-1900 4-15...
  • Page 91: Fuser Unit Mechanism

    3 Thermal cutout 9 Exit pulley(s) % Change guide 4 Exit sensor 0 Heat gear Z36 ^ Heater lamp 5 Fuser board (KP-756) ! Exit gear Z21 6 Press roller @ Idle gear Z18 Figure 4-1-14 Fuser unit mechanism FS-1900 4-16...
  • Page 92: Cleaning

    [board] E (See figure 4-1-15 above.) in the similar manner as described on page 4-6. This lowers the electrical conductivity of the drum B surface making the residual charge on the drum B surface escape to the ground. FS-1900 4-17...
  • Page 93: Paper Feeding System

    4 MP tray ! Lower registration roller * FD roller 5 Paper cassette @ Transfer roller ( Pinch roller(s) 6 Feed pulley # Drum ) Face-down output tray 7 Retard roller $ Press roller Figure 4-2-1 Paper feeding components FS-1900 4-18...
  • Page 94: Paper Feed Control

    2 MP tray paper sensor 6 Paper full sensor 0 Registration clutch 3 Registration sensor 7 MP tray feed solenoid ! Face up/down solenoid 4 Paper gauge sensor 1, 2 8 Middle feed clutch Figure 4-2-2 Paper feed control FS-1900 4-19...
  • Page 95: Paper Feeding Mechanism

    To fuser unit Paper transfer unit 1 Main motor 5 Feed roller 2 Registration clutch 6 Lower registration roller 3 Feed clutch 7 Upper registration roller 4 Pickup roller 8 Transfer roller Figure 4-2-3 Drive and paper transfer unit FS-1900 4-20...
  • Page 96: Mp Tray Paper Feed Unit

    Power train MP tray paper feed unit To paper transfer unit MP tray 9 Middle feed clutch ! MP tray feed roller 0 MP tray feed solenoid @ Middle feed roller Figure 4-2-4 MP tray paper feed unit FS-1900 4-21...
  • Page 97: Fuser Unit And Face Up/Down Output

    Paper from paper transfer unit Drive unit Fuser unit # Heat roller % Exit roller & FD roller $ Press roller ^ Exit pulley(s) * Pinch roller(s) Figure 4-2-5 Fuser unit and face up/down output FS-1900 4-22...
  • Page 98: Electrical Control System

    ‹ Power switch fl Thermal cutout @ Registration sensor (PH701) › Paper size switch ‡ Network interface card or # Paper gauge sensor 1 (PH702) fi Thermistor serial interface card (Optional) Figure 4-3-1 Circuit boards, sensors and switches FS-1900 4-23...
  • Page 99: Motors, Solenoids, Clutches And Others

    9 Registration clutch 2 Polygon motor 6 MP feed solenoid 0 Heater lamp 3 Cooling fan motor 7 Middle feed clutch ! AC inlet 4 Controller unit fan motor 8 Feed clutch Figure 4-3-2 Motors, solenoids, clutches and others FS-1900 4-24...
  • Page 100: Drum Unit And Developer

    1 Drum board (KP-748) 5 Zener board (KP-768) 2 Waste toner full sensor [board] (KP-766) 6 Toner sensor 3 Waste toner full sensor (receiver) 7 Toner motor 4 Eraser lamp [board] (KP-752) Figure 4-3-3 Drum unit and developer FS-1900 4-25...
  • Page 101: Operation Of Circuit Boards

    RISC watch connector Slot SDD31-0 YC10 SDCLK TDI, TCK, TMS, HALTN [Debugger connector] YC09 SDD15-0 DBTXD SDRAM SDA12-0 DBRXD, DBCLK SDCSN1-2 3.3 V Regulator SDCLK +5 V1 +3.3 V1 SDRAM Data bus SDD31-0 Figure 4-3-4 Main board circuit block diagram FS-1900 4-26...
  • Page 102: Engine Board

    SYSRES*, SDIR, VDFON1*, PDOUT*, TONSCAN 20PTRIG, SBSY* TNEMP* EGIR, VDFON1* Main board MCHON, TRCHON, RTRCHON*, SCLKIN, SOIN TRVSEL1,TRVSEL2, TRVSEL3, High FPCLK, FPDIR TRTCHON, HVCLK1, HVCLK2 voltage FPDATA unit HUNIT*, HANDS* +3.3V1 Figure 4-3-6 Engine board circuit block diagram FS-1900 4-27...
  • Page 103: Eraser Lamp Control Circuit

    Call service 5300. Engine board Eraser lamp cotrol circuit +24V U201 3 Q214 Q215 Drum board ERASE P37/SOT0CLK YC203 R249 ERASEDR ERASER R252 Q216 R250 ERDEAD* P40/SCK0 D2207 R251 Eraser lamp [board] Figure 4-3-7 Eraser lamp control circuit FS-1900 4-28...
  • Page 104: Toner Motor Control Circuit

    (U201). Thus, CPU determines the toner motor error and lets Call service 7001 be indicated. Engine board +24V2 Toner motor control circuit 3 Q217 U204 Q218 TMOTON TMOTON R265 YC203 Q220 R266 TMOTDR Toner R267 motor TNMOC TNMOC R268 DZ206 Figure 4-3-8 Toner motor control circuit FS-1900 4-29...
  • Page 105: Heater Lamp Control Circuit

    (U204) HEATON Q204 HEATON QA201A THERM +5V1 (U201) +5V1 HTEMP* P43/PPG3 R233 U205-1 − THDEAD P34/RT04 /HRQ R228 1.3k THERM P50/AN0 +5V1 Thermisor Heater lamp Fuser board Thermal cutout Power supply unit Figure 4-3-9 heater lamp control circuit FS-1900 4-30...
  • Page 106 When the thermistor has blown, pin #2 of U205-1 becomes zero which is well lower than the potential at pin #3 of U205-1, the comparator output becomes H, delivering THDEAD at pin #54 of CPU. CPU uses this signal to determine that the thermistor is faulty and displays Call service 6110. FS-1900 4-31...
  • Page 107: Sensor Board

    D/A converted Paper gauge gauge position output PH702 PH703 sensor 2 (PH703) approximately Empty PH702 PH703 approximately 1/4 to 1/2 2.25 V approximately 1/2 to 3/4 1.95 V approximately 3/4 to full 3.9 V Figure 4-3-10 Paper gauge sensor(s) FS-1900 4-32...
  • Page 108: Interlock Circuit

    The top cover switch (SW701) serves only the top cover. Top cover Projection Left cover interlock switch (SW703) Sensor board Actuator Projection Top cover/ paper transfer Left cover unit interlock Paper transfer unit switch (SW702) Top cover switch Projection (SW701) Figure 4-3-11 Interlock system FS-1900 4-33...
  • Page 109 Close top cover Close left cover Close top cover Close paper transfer unit Close left cover Close paper transfer unit Close left cover Close paper transfer unit Close left cover NOTE: Message display priority is from left to right. Figure 4-3-12 Interlock circuit FS-1900 4-34...
  • Page 110: Paper Size Detecting Circuit

    An analog signal is generated by the combination of the paper size switches, which are put in comparison with the voltage/paper size table referenced by the paper size detecting circuit. The paper size is detected. Paper size switch Paper size dial Cassette Figure 4-3-13 Paper size detecting circuit FS-1900 4-35...
  • Page 111 (Function Off) Convex (Function On) 1.94 V 1.58 V 1.19 V 0.42 V 2.28 V 2.92 V 3.22 V D/A converted output voltage Approximately Note: Toner install mode cancellaton signal (See page 3-14) Figure 4-3-14 Paper size detecting circuit FS-1900 4-36...
  • Page 112: Power Supply Unit

    ZCROSS Photo- coupler HEATON* Photo- Thermal Triac Triac cutout THERM FDFUL EXITPAP* FDDR Thermistor FUDR +5V1 Face up/down +24V Fuser solenoid board Paper full Exit sensor sensor Figure 4-3-15 Power supply unit circuit block diagram FS-1900 4-37...
  • Page 113: High Voltage Unit

    Transfer bias circuit Transfer roller output positive voltage circuit Driver HVCLK circuit Rectifier circuit PGND Sensor circuit +5V2 MP tray HUNIT* Option MP tray feeder paper sensor sensor HANDS* Paper Figure 4-3-16 High voltage unit circuit block diagram FS-1900 4-38...
  • Page 114 D i s a s s e m b l y Chapter 5...
  • Page 115: General Instructions

    Chapter 5 Contents 5-1 General instructions ........................5-3 5-1-1 Screw/hardware ......................... 5-3 5-1-2 Before starting disassembly ...................... 5-3 5-2 Disassembly ............................. 5-4 5-2-1 Removing the developer ......................5-4 (1) Removing the developer ......................5-4 5-2-2 Removing the paper transfer unit ....................5-6 5-2-3 Removing the main charger unit ....................
  • Page 116: General Instructions

    Never attempt to operate the printer with components removed. CAUTION The printer use electrostatic sensitive parts inside (circuit boards, laser scanner unit, etc.). Provide an antistatic (discharging) device, such as a wrist strap, that can effectively discharge your body before touching those components. FS-1900...
  • Page 117: Disassembly

    When handling developer, use both hands. Do not press the bottom of the developer. 1. Open the top cover. 2. Remove the toner container. 3. Disconnect the developer connector 1. 4. Remove the developer 2 from the printer while sliding the developer lock lever 3 frontwards. Figure 5-2-1 Removing the developer FS-1900...
  • Page 118 Do not place the developer in a dusty area. If you ship the developer, pack it in the shipping container specifically supplied with the printer. See section Shipping the developer on page 3-13. Also do not touch the developing roller 5. Do not place floppy disks near the developer. FS-1900...
  • Page 119: Removing The Paper Transfer Unit

    5-2-2 Removing the paper transfer unit 1. Draw the paper transfer unit 1 while pressing the buttons in the direction of arrow A. Figure 5-2-3 Removing the paper transfer unit FS-1900...
  • Page 120: Removing The Main Charger Unit

    5-2-3 Removing the main charger unit 1. Pull the main charger unit 1 upwards while pushing main charger release lever 2. Then, pull the main charger unit 1 frontwards. Figure 5-2-4 Removing the main charger unit FS-1900...
  • Page 121: Removing The Operator Panel And Outer Covers

    5-2-4 Removing the operator panel and outer covers (1) Removing the operator panel 1. Open the top cover 1 and MP tray 2. 2. Unlatch two hooks 3. 3. Pull the operator panel 4 towards the front. Figure 5-2-5 Removing the operator panel FS-1900...
  • Page 122: Removing The Top Cover/Face-Down Output Tray

    (2) Removing the top cover/face-down output tray 1. Open the top cover 1. 2. Remove two screws 2. 3. Remove the top cover/face-down output tray 3 while pressing it the direction arrows 4 (backwards). Figure 5-2-6 Removing the top cover/face-down output tray FS-1900...
  • Page 123: Removing The Right Cover

    (3) Removing the right cover 1. Remove the operator panel. See page 5-8. 2. Unlatch the four snaps 1 and three hooks 2 on the chassis. Remove the right cover 3. Figure 5-2-7 Removing the right cover FS-1900 5-10...
  • Page 124: Removing The Left Cover

    (4) Removing the left cover 1. Unlatch the four snaps 1 and three hooks 2 on the chassis. Remove the left cover 3. Figure 5-2-8 Removing the left cover FS-1900 5-11...
  • Page 125: Removing The Drum Unit

    1. Remove the paper cassette and the paper transfer unit. See page 5-6. 2. Remove the developer unit. See page 5-4. 3. Remove the waste toner bottle. See page 3-7. 4. Remove the drum unit 1 while pressing the drum lock 2. Figure 5-2-9 Removing the drum unit FS-1900 5-12...
  • Page 126: Removing The Pickup Roller And Feed Roller

    2. Turn the paper transfer unit 1 over. 3. Detach the release holder 2 by sliding it while pressing the projections A. 4. Remove the feed roller assembly 3 while pressing it in the direction of arrow B. Figure 5-2-10 Removing the feed roller assembly FS-1900 5-13...
  • Page 127 Figure 5-2-11 Remove the pickup roller and feed roller Pickup gear Z32S 8 is installed of the inside the one way clutch 9. When CAUTION refitting pickup gear Z32S 8, face the one way clutch 9 face to the feed bracket cover 4. FS-1900 5-14...
  • Page 128: Removing The Mp Paper Feed Unit

    1. Remove the paper transfer unit. See page 5-6. 2. Remove the developer. See page 5-4. 3. Remove three connectors 1. 4. Remove the engine relay board 2 while unlatching the latches 3. Figure 5-2-12 Removing the engine relay board FS-1900 5-15...
  • Page 129 5. Pull the MP tray paper feed unit 4 out while unlatching two latches 5 off of points A. Figure 5-2-13 Removing the MP paper feed unit FS-1900 5-16...
  • Page 130: Removing The Transfer Roller

    1 can significantly deteriorate the print quality (white spots, etc.). 1. Draw the paper transfer unit from the printer. 2. Remove the paper chute 2. 3. Remove the transfer roller 1. Figure 5-2-14 Removing the transfer roller FS-1900 5-17...
  • Page 131: Removing The Controller Unit And The Principal Circuit Boards

    3. Remove the four connectors 1 from the controller unit 2 left side. CAUTION Draw the connector straight to remove. If you draw the connector while it is slanted, the receptacle may be damaged. Receptacle Connector Figure 5-2-15 Removing the connectors from controller unit left side FS-1900 5-18...
  • Page 132 4. Remove the two connectors 3 from the controller unit 2 right side. Receptacle Connector Figure 5-2-16 Removing the connectors from controller unit right side FS-1900 5-19...
  • Page 133 5. Remove three screws 4. 6. Remove frame unit 5 while releasing the projections from the catches on the frame unit 5. Figure 5-2-17 Removing the controller unit form the frame unit FS-1900 5-20...
  • Page 134 7. Remove two screws 6. 8. Remove the main board 7. 9. Remove four screws 8. 10. Remove the controller unit lid 9 from the controller unit 2. Figure 5-2-18 Opening the controller unit FS-1900 5-21...
  • Page 135: Removing The Engine Board And Power Supply Unit

    (2) Removing the engine board and power supply unit 1. Remove and open the controller unit. See pages 5-18. 2. Remove two connectors 1 from the engine board 2. 3. Remove five screws 3. 4. Remove the engine board 2. Figure 5-2-19 Removing the engine board FS-1900 5-22...
  • Page 136 6. Remove one screw 5, grounding wire terminal 6, and lock washer 7. 7. Remove three screws 8. 8. Remove the power supply unit 9 from the power supply unit cover 0. Figure 5-2-20 Removing the power supply unit FS-1900 5-23...
  • Page 137: Removing The Main Board

    2. Remove the memory card that may be inserted in the memory card slot 1 at the left side of the printer. 3. Remove two screws 2. 4. Pull the main board 3 all the way out of the printer. Figure 5-2-21 Removing the main board FS-1900 5-24...
  • Page 138: Removing The High Voltage Unit

    1. Remove the top cover and left covers. See pages 5-9 and 5-11. 2. Remove the high voltage unit 1 while unlatching two latches 2. 3. Remove two connectors 3, from the high voltage unit. 1. Figure 5-2-22 Removing the high voltage unit FS-1900 5-25...
  • Page 139: Removing The Sensor Board

    2. Remove the high voltage unit. See previous page. 3. Remove two connectors 1. 4. Remove the high voltage unit cover 2. 5. Remove the sensor board 3 while unlatching two latches A. Connector Receptacle Connector Receptacle Figure 5-2-23 Removing the sensor board FS-1900 5-26...
  • Page 140: Removing The Drive Unit And Main Motor

    5. Remove three connectors 2 of the drive unit 3. 6. Remove five screws 4 and the ground wire terminal 5. 7. Remove the drive unit 3 from the frame unit. Connector Receptacle Connector Receptacle Figure 5-2-24 Removing drive unit FS-1900 5-27...
  • Page 141 8. Remove four screws 6. 9. Remove the main motor 7 from the drive unit 3. Figure 5-2-25 Removing the main motor FS-1900 5-28...
  • Page 142: Removing And Splitting The Fuser Unit

    The fuser unit is hot after the printer was running. Wait until it cools down. 1. Remove three connectors 1. 2. Remove two screws 2. 3. Remove the fuser unit 3 from the frame unit. Figure 5-2-26 Removing the fuser unit FS-1900 5-29...
  • Page 143 4. Remove the rear cover 4 and the spring 5. 5. Remove the solenoid actuator 6. 6. Remove the change guide 7. 7. Remove one connector 8. Figure 5-2-27 Removing the rear cover and change guide FS-1900 5-30...
  • Page 144 8. Remove two screws 9. 9. Split the fuser unit 0. Figure 5-2-28 Splitting the fuser unit FS-1900 5-31...
  • Page 145: Removing The Separators

    2. Remove the upper exit guide 1 while unlatching three latches 2. 3. Remove the exit pulley 3. 4. Hold the separator 4 upright and remove the separator 4 and the separator spring 5. Step 1 Step 2 Figure 5-2-29 Removing the separators FS-1900 5-32...
  • Page 146: Removing The Heater Lamp

    1. Remove and split the fuser unit. See page 5-29. 2. Remove the lamp support 1. 3. Remove one screw 2 then remove the lamp holder 3. 4. Remove the heater lamp 4 from the heat roller 5. Gear Wattage marking Figure 5-2-30 Removing the heater lamp FS-1900 5-33...
  • Page 147: Removing The Heat Roller

    4. Pull up both heat R bush 1 and heat L bush 2 at the same time. 5. Remove heat gear Z36 3, heat R bush 1, and heat L bush 2 from the heat roller 4. Figure 5-2-31 Removing the heat roller FS-1900 5-34...
  • Page 148: Removing The Thermistor And The Thermal Cutout

    5. Remove the thermistor 2. 6. Remove two screws 3 and then remove cord plate 4. 7. Remove one screw 5 and the heater wire terminal 6. 8. Remove the thermal cutout 7. Figure 5-2-32 Removing the thermistor and thermal cutout FS-1900 5-35...
  • Page 149: Removing The Press Roller

    The press roller is extremely hot immediately after the printer was running. Allow substantial period of time until it cools down. 1. Remove and split the fuser unit. See page 5-29. 2. Remove the press roller 1 from the fuser unit 2. Figure 5-2-33 Removing the press roller FS-1900 5-36...
  • Page 150: Removing The Laser Scanner Unit

    4. Remove the laser scanner unit 3 from the frame unit. Order of fixing the laser scanner unit CAUTION When refitting the laser scanner unit, fix the four screws in the order indicated above. Figure 5-2-34 Removing the laser scanner unit FS-1900 5-37...
  • Page 151: Troubleshooting

    T r o u b l e s h o o t i n g Chapter 6...
  • Page 152 Chapter 6 Contents 6-1 Troubleshooting ..........................6-4 6-1-1 General error handling ....................... 6-4 (1) Maintenance messages ......................6-4 (2) Error messages ......................... 6-7 6-1-2 Diagnostic (Service error messages) ..................6-11 (1) 0420 - Option paper feeder PF-60 communication error ............6-11 (2) 0440 - Option sorter SO-60 communication error ..............
  • Page 153 6-1-4 Circuit board terminal voltages ....................6-28 (1) Engine board ........................... 6-28 6-1-5 Assignment of circuit board connector pins ................6-34 6-1-6 Print quality problems ......................6-35 (1) Completely blank printout ......................6-36 (2) All-black printout ........................6-37 (3) Dropouts ..........................6-38 (4) Black dots ..........................
  • Page 154: Troubleshooting

    Remove all printed pages from the face-down output tray. When the printer senses that the face-down output tray is empty again, it will continue printing into the face-down output tray. : Alarm buzzer sounds when an error occurs. Press the CANCEL key to stop the alarm buzzer. FS-1900...
  • Page 155 A failure has occurred with the (option) network interface card. Option interface Check the (option) network interface card installed on the printer. Error : Alarm buzzer sounds when an error occurs. Press the CANCEL key to stop the alarm buzzer. FS-1900...
  • Page 156 Print a status page to see how much user Low memory 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-1900...
  • Page 157: Error Messages

    05: The specified file does not exist in the hard disk (Microdrive). 06: There is no memory available to the hard disk (Microdrive) system. Increase the available memory. : Alarm buzzer sounds when an error occurs. Press the CANCEL key to stop the alarm buzzer. FS-1900...
  • Page 158 Note: We recommend that you follow the reading procedure from the beginning to ensure correct reading of the memory card. : Alarm buzzer sounds when an error occurs. Press the CANCEL key to stop the alarm buzzer. FS-1900...
  • Page 159 If Auto Continue is set to On, printing will be automatically resumed after a preset period of time. Refer to printer’s User’s Manual. : Alarm buzzer sounds when an error occurs. Press the CANCEL key to stop the alarm buzzer. FS-1900...
  • Page 160 The storage area for the VMB is full. Purge accumulated VMB data Virtual mail by printing or deleting them. box fail : Alarm buzzer sounds when an error occurs. Press the CANCEL key to stop the alarm buzzer. FS-1900 6-10...
  • Page 161: Diagnostic (Service Error Messages)

    Replace main board Improper connector insertion. (KP-948). See page 5- Defective main board (KP-948). Refer to option sorter Defective option sorter SO-60. S O - 6 0 ’ s S e r v i c e Manual. FS-1900 6-11...
  • Page 162: 0460 - Option Duplexer Du-60 Communication Error

    Defective harness (S02400) between engine R e p l a c e h a r n e s s board and option unit interface connector. (S02400). Improper connector insertion. Remedy. Defective option duplexer DU-60. Refer to option duplexer DU-60’s Service Manual. FS-1900 6-12...
  • Page 163: 2000 - Main Motor Error

    Harness (S02401) between engine Replace Main motor. relay board (KP-760) and engine See page 5-27. board (KP-864) Drive unit (See page 5-27.) Engine board (KP-864) and main motor (replace at the same time) FS-1900 6-13...
  • Page 164: 2600 - Option Bulk Paper Feeder Pf-8E Motor Error

    Defective harness (S02400) between engine R e p l a c e h a r n e s s board and option unit interface connector. (S02400). Defective paper feeder PF-60. Refer to option paper feeder PF-60’s Service Manual. FS-1900 6-14...
  • Page 165: 4000 - Laser Scanner Unit (Polygon Motor) Error

    When If not solved this flow chart, Replace engine board try to replace below items. (KP-864). See page 5-22. Harness (S02404) scanner unit and engine board (KP-864) Engine board (KP-864) and scanner unit (replace at the same time) FS-1900 6-15...
  • Page 166: 4200 - Laser Scanner Unit (Pin Photo Diode Sensor) Error

    If the problem is not solved by then low? this flow chart replace the following items: Replace engine board Harness (S02404) scanner unit (KP-864). See page 5-22. and engine board (KP-864) Engine board (KP-864) and scanner unit (replace at the same time) FS-1900 6-16...
  • Page 167: 5300 - Eraser Lamp Error

    If the problem is not solved by this flow chart replace the Remedy pins or replace following items: sensor board (KP-754). Turn power switch on See page 5-26. Engine board (KP864) and print starus page. Sensor board (KP754) Drum unit FS-1900 6-17...
  • Page 168: 6000 - Fuser Unit Error

    "E4" shown? Detach connector CN2 A on power supply Replace engine board See figure right. board. (KP-864). See page 5-22. Measure resistance Heater lamp between pins 1 and 3 of the detached End. connector. FS-1900 6-18...
  • Page 169: 6020 - Abnormal High Temperature Error

    NOTE: If the problem is not solved by this flow chart replace, the More following items: than 3 V DC over 3 Replace engine board seconds? Engine board (KP-864) (KP-864). See page 5-22. Power supply unit Fuser unit FS-1900 6-19...
  • Page 170: 6400 - Zero Cross Signal Error

    See page 5-22 and 3-13. End. NOTE: If the problem is not solved by this flow chart, replace the following items: High voltage unit Harness (S02416) [Between developer and high voltage unit] Harness (S02416) [Between engine board and high voltage unit] FS-1900 6-20...
  • Page 171: 7350 - Toner Refreshing Mode Error

    Replace system DIMM system DIMM [board [board KP-893] or main KP-893] on the main board (KP-948). board. Improper system DIMM [board KP-893] Reinsert the system insertion to system DIMM slot on the main DIMM [board KP-893]. board (KP-948). FS-1900 6-21...
  • Page 172: F020 - Main Or Expanded Memory Error

    ROM U202 on the engine board (KP- (KP-864). data failed to flash 864). ROM U202. Write sequence to flash ROM is not successful. Verify error. (Written data does not match the original data.) FS-1900 6-22...
  • Page 173: Other Problems

    Measure logic level #11 pin of YC701 on sensor board (KP-754). When Top cover close scurely, does pin #11 goes low to high? Replace sensor board (KP-754). See page 5-26. Replace engine board (KP-864). See page 5-22. FS-1900 6-23...
  • Page 174: False "Close Left Cover

    Check and straighten pins waste toner sensor board (KP-574). of connector (YC702) on box is displayed. the sensor board (KP- Although waste toner 574). bottle is not installed, Replace engine board Defective engine board (KP-864). Ready is displayed. (KP-864). FS-1900 6-24...
  • Page 175: Defective Paper Jam Detecting

    Suggested causes Corrective action False paper size Defective paper size switch. Replace paper size switch. message display. Defective sensor board (KP-754). Replace sensor board (KP-574). See page 5-26. Replace engine board Defective engine board (KP-864). (KP-864). See page 5-22. FS-1900 6-25...
  • Page 176: Defective Message Displaying (Lcd)

    NOTE: If the corrective action above does not solve the problem, there might be a short circuit in the respective circuit. Check the conductivity of the each terminals ( ground, 5 V and 24 V power line) of the circuit board. If a short circuit is detected, replace the circuit board. FS-1900 6-26...
  • Page 177: Defective Face Up/Down Solenoid Operating

    (KP-756) at the same time. Or replace fuser unit. See page 5-29. Defective engine board (KP-864) or power Replace engine board supply unit. (KP-864) or power supply unit. See page 5-22. FS-1900 6-27...
  • Page 178: Circuit Board Terminal Voltages

    Power supply for LCD controller board B13 FPCLK 3.3 V/0 V DC (Pulse) Communication data clock signal with LCD controller board A14 GND Signal ground B14 FPDATA I/O 3.3 V/0 V DC (Pulse) Communication data signal with LCD controller board FS-1900 6-28...
  • Page 179 5 V DC Power supply Signal ground +24V2 24 V DC Power supply SLEEP* 0 V/5 V DC Energy saving mode, On/Off ZCROSS 5 V/0 V DC (pulse) Zero cross signal HEATON* O 0 V/5 V DC Heater lamp, On/Off FS-1900 6-29...
  • Page 180 5 V/0 V DC (pulse) EEPROM (Drum board) clock signal REGPAP* 0 V/5 V DC Registration sensor, Paper Detected/Not detected PVOLAN1 0 V/5 V DC Paper gauge sensor 1, On/Off TCOVOP 0 V/5 V DC Top cover switch, On/Off FS-1900 6-30...
  • Page 181 Power supply for high voltage board YC205 OP24V 24 V DC Power supply for option unit Signal ground OP5V 5 V DC Power supply for option unit Reserved OPSCLK 5 V/0 V DC (Pulse) Serial communication clock signal FS-1900 6-31...
  • Page 182 Power supply for laser scanner unit SAMPLE1* 0 V/5 V DC (Pulse) Laser power data sample and hold control signal Data Sampling/Not sampling POWCONT 0 V/5 V DC Laser power level control signal,High/Low LASER* 0 V/5 V DC Laser power output signal, Enable/Disable FS-1900 6-32...
  • Page 183 Temperature/humidity sensor detecting external temperature signal +5V1 5 V DC Power supply for engine relay board WETCK1 0 V/5 V DC (Pulse) Temperature/humidity sensor driveclock signal 1 WETCK2 0 V/5 V DC (Pulse) Temperature/humidity sensor drive clock signal 2 FS-1900 6-33...
  • Page 184: Assignment Of Circuit Board Connector Pins

    Engine board High voltage unit [Parts side] [Solder side] High voltage unit Engine board YC204 YC203 Engine board Fuser board Fuser board YC833 YC831 Power supply unit YC902 Power supply unit Figure 6-1-1 Assignment of circuit board connector pins FS-1900 6-34...
  • Page 185: Print Quality Problems

    See page 6-42. See page 6-44. (9) Dirt on the top (10) Undulated printing edge or back of at the left edge (scanning the paper start position) See page 6-45. See page 6-46. This vertical line should be straight. FS-1900 6-35...
  • Page 186: Completely Blank Printout

    Check the laser scanner unit. • The scanner components within the scanner may be disordered. Replace the laser scanner unit. See page 5-37. Replace the main board. • Defective laser scanner unit control circuit in the main board (KP-948). See page 5-24. FS-1900 6-36...
  • Page 187: All-Black Printout

    • Check the high voltage output on the high voltage unit. Replace the high voltage unit if high voltage potential is not available on the board. Replace the main board. • Defective laser scanner unit control circuit in the main board (KP-948). See page 5-24. FS-1900 6-37...
  • Page 188: Dropouts

    • Check the transfer bias output on the high voltage unit. This requires removal of the left cover and the test equipment. Replace the high voltage unit if high voltage potential is not available on the board. See page 5-25. FS-1900 6-38...
  • Page 189: Black Dots

    • The drum axle in the drum unit and its counter part, the grounding tab in the printer, must be in a good contact. If necessary, apply a small amount of electro-conductive grease onto the tab. The drum may be defective. • Replace the drum unit. See page 5-12. FS-1900 6-39...
  • Page 190: Black Vertical Streaks

    • A streak of toner remaining on drum after printing means that the cleaning blade (in the drum unit ) is not working properly. Replace the drum unit. See page 5-12. Defective magnet roller (in the developer). • Replace the developer. See page 5-4. FS-1900 6-40...
  • Page 191: Unsharpness

    • The EcoPrint mode can provides faint, unsharp printing because it acts to conserve toner for draft printing purpose. For normal printing, turn the EcoPrint mode off by using the operator panel. For details refer to the printer’s User’s Manual. FS-1900 6-41...
  • Page 192: Gray Background

    • If a developer which is known to work normally is available for check, replace the current developer in the printer with the normal one. If the symptom disappears, replace the developer with a new one. See page 5-4. FS-1900 6-42...
  • Page 193: Dirt On The Top Edge Or Back Of The Paper

    Clean these areas and parts to remove toner. Check the transfer roller. • If the transfer roller is contaminated with toner, clean the transfer roller using a vacuum cleaner; or by continuously printing a low-density page until the symptom has faded away. FS-1900 6-43...
  • Page 194: Undulated Printing At The Left Edge (Scanning Start Position)

    Replace the laser scanner unit. • Defective polygon motor in the laser scanner unit. Replace the laser scanner unit. See page 5-37. Replace the engine board. • Defective engine controller circuit in the engine board (KP-864). See page 5-22. FS-1900 6-44...
  • Page 195: Repetitive Defects Gauge

    First occurrence of defect [39 mm] Developing roller (Developer) [50 mm] Upper and Lower registration roller [62 mm] Transfer roller [72 mm] Heat and press roller (Fuser unit) [94 mm] Drum (Drum unit) Figure 6-1-2 Repetitive defects gauge FS-1900 6-45...
  • Page 196: Correcting A Paper Jam

    1. While pulling the paper transfer unit release lever 1, pull out the paper transfer unit 2. Figure 6-1-3 Drawing the paper transfer unit 2. Open the rear cover 3 and remove the jammed paper as shown in the figure. Figure 6-1-4 Jam in the rear cover FS-1900 6-46...
  • Page 197: Jam Inside The Printer

    2. If paper is jammed before the registration roller, remove it as shown figure 6-1-5. If paper jammed under the registration roller, remove it as shown in figure 6-1-6. Figure 6-1-5 Jam in the printer (1) Figure 6-1-6 Jam in the printer (2) FS-1900 6-47...
  • Page 198 Appendix A...
  • Page 199: Timing Charts

    Appendix A Contents Timing charts ............................A-3 Cassette feeding, two A4 size papers, face-down tray output ............. A-3 Cassette feeding, two letter size papers, face-down tray output ............A-4 Cassette feeding, two legal size papers, face-down tray output ............A-5 Option paper feeder cassette feeding, two A4 size papers, face-down tray output ......
  • Page 200: Timing Charts

    Timing charts Cassette feeding, two A4 size papers, face-down tray output FS-1900...
  • Page 201: Cassette Feeding, Two Letter Size Papers, Face-Down Tray Output

    Cassette feeding, two letter size papers, face-down tray output FS-1900...
  • Page 202: Cassette Feeding, Two Legal Size Papers, Face-Down Tray Output

    Cassette feeding, two legal size papers, face-down tray output FS-1900...
  • Page 203: Option Paper Feeder Cassette Feeding, Two A4 Size Papers, Face-Down Tray Output

    Option paper feeder cassette feeding, two A4 size papers, face-down tray output FS-1900...
  • Page 204: Mp Tray Feeding, Two A4 Size Papers, Face-Down Tray Output

    MP tray feeding, two A4 size papers, face-down tray output FS-1900...
  • Page 205: Mp Tray Feeding, Two Letter Size Papers, Face-Down Tray Output

    MP tray feeding, two letter size papers, face-down tray output FS-1900...
  • Page 206: Mp Tray Feeding, Two Legal Size Papers, Face-Down Tray Output

    MP tray feeding, two legal size papers, face-down tray output FS-1900...
  • Page 207: Wiring Diagram

    Wiring diagram FS-1900 A-10...
  • Page 208: Status Page

    S t a t u s P a g e Appendix B...
  • Page 209 Appendix B Contents Status page ............................. B-3 Printing the service status page ......................B-3 Service information on the status page ....................B-4 Details of service information ......................B-4...
  • Page 210: Status Page

    1. Connect the printer to the PC via the parallel interface. 2. Ensure that the printer is ready to print. 3. At the DOS prompt, type: echo !R! STAT 1; EXIT; >lpt1: The service status page is printed. (If you omit ‘1,’ a user status page is printed.) FS-1900...
  • Page 211: Service Information On The Status Page

    Details of service information Released date of the firmware Controller firmware version* Firmware version: 84.00-01 Released: 28/Sep/2001 Service information [0A00/0003][C1][32.00 ][17/05] Total page 9690 /t/P00/S00/F00/N00/D10:DM0301.DAN/ /0020/0020/1061/0811/ /AAAAAA/AAAAAA/AAAAAA/AAAAAA/ AAAAAA/AAAAAA/ AAAAAA/ /003D/0005/0005/0005/0005/0005/0005/0005/0000/ RS2/FF/[0003-0003]/AI.E/1/20/31/50 /8088808880808000/8088808880808000/8088808880808000/8088808880808000/ /20A11080/1020B200/20001080/81000000/00000000/10101010/10101010/ SPD1:0203040508090A0B0C0D0F101112131415161718191A1B1C1D1E1F202122235E DN:SPL9200007 SN:SPL9200010 Service information FS-1900...
  • Page 212: Total Page

    Boot ROM version and DIMM [32.00 ] or [32.00*] type The last digit means DIMM type, the blank is flash type, and the asterisk (*) is mask type. 4 [17/05] Internal use 5 Total page 9690 Total count page 6 t/ Internal use FS-1900...
  • Page 213: Parallel Interface

    Duplexer $ /AAAAAA/AAAAAA Life counter for the paper source /Top paper feeder/Middle feeder /Bottom feeder/Duplexer /AAAAAA/AAAAAA /Bulk paper feeder/ /AAAAAA/ % /AAAAAA/AAAAAA/ Life counter for the paper exit /Bulk paper stacker/Sorter device ^ /AAAAAA/ Life counter for the drum FS-1900...
  • Page 214 Detailed media type settings 1 to /20A11080/1020B200 28. (14 to 20 are reserved /20001080/81000000 and fixed to setting “0x00”. ) /00000000/10101010 /10101010 · SPD2:02030405... SPD (slot1) ‚ DN:SPL92000007 Serial number for the drum Œ SN:SPL92000010 Serial number for the printer FS-1900...
  • Page 215 Appendix C...
  • Page 216 Appendix C Contents Parallel interface ............................ C-3 Selecting the parallel interface mode ....................C-3 Parallel interface pin assignment ......................C-4 Parallel interface signals ........................C-5 USB interface ............................C-6 USB interface pin assignment ......................C-6 Serial interface (option) ......................... C-7 RS-232C interface voltage levels ......................
  • Page 217: Parallel Interface

    To set the parallel interface mode... Type at the DOS prompt... Normal echo !R! FPRO O0, 0; EXIT;>lpt1: High-speed echo !R! FPRO O0, 1; EXIT;>lpt1: Nibble echo !R! FPRO O0, 5; EXIT;>lpt1: Automatic* echo !R! FPRO O0, 70; EXIT;>lpt1: *: Factory-set default. FS-1900...
  • Page 218: Parallel Interface Pin Assignment

    Chassis ground GND Not defined Pull-up (1 kΩ) Peri-logic H (VCC) nSelect In (SELECTI*) Maximum rated current for pin 18 is 500 mA (fused). Pin 18 can not use pin 12 (+5V) of serial connector RS-232C at the same time. FS-1900...
  • Page 219: Parallel Interface Signals

    This signal is high when the printer’s power is on. Power Ready (Pin 35) 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, (Pin 36) it is used as an interrupt. FS-1900...
  • Page 220: Usb Interface

    5 meters (16 feet). Transfer mode Full speed (max. 12 Mbps) Power control Self-power device USB interface pin assignment Shell Pin No. Signal Description Vbus Power supply (+5 V) Data transmission Data transmission Signal ground Shell Shield Shell: Shield FS-1900...
  • Page 221: Serial Interface (Option

    All signals can transmit between the printer and the host computer to send each signals with a signal ground. DTR (Pin 20) This output is used as a buffer nearly-full handshake line. It is held high (above 3 V) when the buffer can accept more data. FS-1900...
  • Page 222: Protocol

    User’s Manual. RS-232C - For computers with a DB-9 connector Serial interface Computer board IB-10E serial port (DB-9) connector (DB-25) RS-232C - For computers with a DB-25 connector Serial interface Computer board IB-10E serial port (DB-25) connector (DB-25) FS-1900...
  • Page 223 Via Verdi 89/91 20063 Cernusco sul Naviglio (Milano) Italy Headquarters: Phone: 02-92179 1 225 Sand Road, P.O. Box 40008, Fairfield, New Jersey 07004-0008, S.A. KYOCERA MITA BELGIUM N.V. U.S.A. Hermesstraat 8A, 1930 Zaventem, Belgium Phone: (973) 808-8444 Phone: (02) 7209270 KYOCERA MITA FRANCE S.A.
  • Page 224 KYOCERA MITA MEXICO, S.A. DE C.V. Av. 16 de Septiembre #407 Col. Santa Inés, 02130 Azcapotzalco México, D.F. Mexico TEL : (5) 383-2741 FAX : (5) 383-7804 ©2001 KYOCERA MITA CORPORATION is a trademark of Kyocera Corporation is a registered trademark of KYOCERA MITA CORPORATION...

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