Page 1 DIGITAL Laser Printer LN15 ERVICE ANUAL & ARTS ATALOG EK-LN15X-SV.A01...
Page 2: Table Of Contents
CONTENTS CHAPTER 1 GENERAL DESCRIPTION ....................1-1 INTRODUCTION ............................1-1 EQUIPMENT CONSTRUCTION ......................1-2 1.2.1 General ..............................1-2 1.2.2 Model Configuration ........................... 1-2 1.2.3 Structure ............................... 1-4 Covers ............................1-6 Laser unit ............................ 1-7 Printer mechanism........................1-8 Print unit (user replaceable) ....................... 1-9 Cleaner assembly ........................
Page 3 Black ............................3-13 (10) White ............................3-14 (11) Blur ............................3-15 (12) Smudge ............................. 3-16 ERROR AND STATUS MESSAGES ..................... 3-17 3.3.1 Error Messages ..........................3-17 3.3.2 Status Messages ..........................3-18 RESETTING THE PRINT UNIT (FUSER UNIT) COUNTER .............. 3-20 OTHERS ..............................
Page 4 (16) Cover-open switch replacement ....................4-36 (17) Volume board replacement ...................... 4-37 (18) Stacker-full sensor board (SFS board) replacement ..............4-38 (19) Frame-2 assembly replacement ....................4-39 (20) Multi-function feeder board (MFF board) replacement ............4-40 (21) Separator assembly (friction pad holder) replacement............. 4-41 (22) Print unit disassembly ......................
Page 5 CHAPTER 5 DESCRIPTION OF OPERATION ..................5-1 GENERAL ..............................5-1 MECHANICAL OPERATION ........................5-2 ELECTRICAL OPERATION ........................5-6 5.3.1 System Diagram........................... 5-6 5.3.2 Main Controller ........................... 5-8 CPU ............................5-10 RAM............................5-10 ROM............................5-10 Expansion interface ........................5-11 LSI-1 ............................5-11 Print density converter LSI ......................
Page 6 ILLUSTRATIONS AND TABLES Figure 1-1 Digital Laser Printer LN15 ....................... 1-3 Figure 1-2 Structure ............................1-5 Figure 1-3 Laser Unit ............................1-7 Figure 1-4 Printer Mechanism ..........................1-8 Figure 1-5 Power Supply Unit .......................... 1-10 Figure 1-6 Control Board ..........................1-11 Figure 2-1 Shipping Carton and Printer and its Accessories ................
Page 7 Table 3-1 Error Messages ..........................3-17 Table 3-2 Action-required Status Messages ...................... 3-18 Table 3-3 Printer Status Messages ........................3-19 Table 4-1 Maintenance Tools ..........................4-2 Table 4-2 Parts That Must Not be Disassembled ....................4-6 Table 4-3 Cleaning .............................. 4-7 Table 4-4 PPMENU Factory Defaults When Emulation is PCL ..............
Page 8 PREFACE This manual is for maintenance engineers and discusses the operation, installation, and maintenance of the DIGITAL Laser Printer LN15. The topics covered are: Chapter 1: Printer specifications, performance, and configuration Chapter 2: Installation precautions and unpacking Chapter 3: Diagnosing mechanical and electronic problems...
Page 9: Chapter 1 General Description
GENERAL DESCRIPTION 1.1 INTRODUCTION This manual is for maintenance service engineers. The DIGITAL Laser printer LN15 is based on the QMS Desklaser 1400P printer that is manufactured by Fujitsu using the PrintPartner 14ADV printer engine. This manual is customized for the DIGITAL Laser Printer LN15 from the PrintPartner 14ADV Service Manual &...
Page 10: Equipment Construction
1.2 EQUIPMENT CONSTRUCTION 1.2.1 General This section outlines the construction and features of the LN15 laser printer . 1.2.2 Model Configuration Model and input voltage Printer LN15P-AC : 220–240 VAC (for Europe), 11MB, No Network card + central Europe power cord LN15N-AC : 220–240 VAC (for Europe), 19MB, Ethernet Card...
Page 11 Paper tray [ Front and right side view] Rear stacker Interface board slot cover Power switch Centronics parallel interface connector Power cord connector [ Rear and left side view ] Figure 1-1 LN15 Laser Page Printer 1 - 3...
Page 12: Structure
1.2.3 Structure The standard printer without options has the following structure. LN15 Laser printer Upper cover assembly Covers Ozone filter Control panel Shade cover Side cover L Laser unit Side cover R Printer mechanism Front frame Print unit OPC drum unit...
Page 13: Figure 1-2 Structure
Printer + optional duplex unit + optional paper feeder Print unit Laser unit Cleaner assembly Toner bottle OPC drum Heat roller Upper cover (fuser unit) assembly Resist roller Eject roller Paper feed roller Multi-Function feeder (Option) Pick-up roller Paper tray 1 Duplex unit (option) Paper feeder...
Page 14 (1) Covers The covers consist of the following: • Upper cover assembly • Side cover L • Side cover R • Front frame • Front cover • Back cover • Stacker Upper cover assembly The upper cover assembly covers the top of the printer mechanism and stacks printed paper. The upper cover assembly has a hinge to enable the front (upper door) to open.
Page 15: Figure 1-3 Laser Unit
(2) Laser unit The laser unit is provided in the upper cover. Images are written on the photoconductive drum of the print unit by laser beams emitted from the laser unit. Caution label Figure 1-3 Laser Unit CAUTION : Do not look at a laser beam directly. This label is put on the laser unit.
Page 16: Figure 1-4 Printer Mechanism
(3) Printer mechanism Figure 1-4 Printer Mechanism Metal frame This frame is the basic frame of the printer mechanism and made of sheet metals. All parts are tightened with screws or snap-fitted to this frame. The fan (FAN1) is installed on this frame. b.
Page 17: Print Unit (User Replaceable)
Paper guide assembly 2 This guide transports printed paper to the output stacker. This guide is snap-fitted to the frame on which the paper eject roller is installed. The stacker-full sensor is installed on this assembly. Print unit guide This guide is used to install the print unit in the printer. The cover open switch that detects opening and closing of the upper door is installed on the left guide.
Page 18: Power Supply Unit
It lasts about for 100,000 pages printed at 5% coverage on A4 paper in continuous print mode. There are two types: one for input voltage of 120 VAC (Not used on LN15) and the other for 220 to 240 VAC.
Page 19: Shield Plate
Cover This cover, classified as a component belonging under the fuser unit category, covers the main power supply. It is attached on the bottom of the fuser unit and the power supply is installed under (inside) the cover. The paper guide assembly 1 is also installed at the edge of the cover. d.
Page 20: Sensor Board Assembly
(9) Sensor board assembly Sensor boards There are two sensor boards. They detect the presence of paper, the size of paper, paper empty, and paper ejection. b. High-voltage power supply board (HV board) The high-voltage power supply, which supplies high voltage to the pre-charger and the transfer charger unit, is tightened with screws to the left side of the sensor board assembly.
Page 21: Chapter 2 Installation
CHAPTER 2 INSTALLATION 2.1 GENERAL DESCRIPTION The LN15 laser printer is well-packed for shipping, and can be unpacked easily. After the printer is unpacked, it should be checked with a test printing prior to final installation. Installation procedures are simple and require a minimum of time.
Page 22: Unpacking
UNPACKING If possible, retain the carton and packing materials should the printer be reshipped. 1. Peel off the top tape to open the four flaps. 2. Take the toner bottle package, the power cord package, the multi-function feeder (MFF) package, and the package of user’s manual, floppy disks, cleaning brush, and paper size labels from the carton.
Page 23: Inspection After Unpacking
INSPECTION AFTER UNPACKING Visually check the printer exterior. Then, turn power on and check the print quality and printer performance. See the user’s manual for details of procedures. 1. Peel off adhesive tapes from the printer. Open the upper door and remove the two restraint cardboards.. Draw out the paper tray and remove the restraint cardboard and tapes securing the rear paper guide.
Page 24 d. Remove the plastic seal from the toner bottle. Pull off the seal as gently as possible to avoid spilling toner. Be careful not to stain yourself with toner which is stuck to the seal. Install the toner bottle. Slide in both projecting guides of the toner bottle along the grooves of the print unit. Lock the toner bottle.
Page 25 g. Close the printer’s upper door. Press down firmly on the front portion of the upper door and make sure the upper door is locked completely. CAUTION Be sure to hold the toner bottle while removing the seal to avoid spilling toner. If you have installed the toner bottle, never remove it from the print unit until it has no toner, to avoid spilling toner inside the printer.
Page 26: Figure 2-2 Status Report (Fps Emulation)
Figure 2-2 Status Report (FPS Emulation) 2 - 6...
Page 27: Chapter 3 Troubleshooting
CHAPTER 3 TROUBLESHOOTING This chapter helps you determine the causes and remedies of problems that might occur. Sections 3.1 and 3.2 are troubleshooting diagrams. Follow the flowchart steps to remedy the problem. Section 3.3 describes the meaning of the various indicator displays on the control panel. The indicators help with troubleshooting.
Page 28: Figure 3-1 Printer Elements And Connections
Figure 3-1 Printer Elements and Connections 3 - 2...
Page 29: When The Power Indicator Does Not Light
3.1 WHEN THE POWER INDICATOR DOES NOT LIGHT Start Is the POWER lamp on for a while after power on? Is the condition still Defective power, the same when the Connect connector. mechanism, or motor connector is controller board disconnected? See page 4-21 or 24 connector and other pages of...
Page 30: When Printing Quality Is Abnormal
3.2 WHEN PRINTING QUALITY IS ABNORMAL (1) Faint (2) Deep (3) Clear or blurred black vertical line (4) White vertical line (5) Lacking space at the (6) Black point, white (7) Second printing top and bottom point (Ghost printing) (8) Dirty back/edge (9) Black (10) White (11) Blur...
Page 31: When Faint
(1) When faint Start Is density dial Adjust density dial. proper? See page 4-5. Does LCD display Replace toner bottle. TONER EMPTY? See pages 2-3 to 4. Clean transfer corona transfer corona wire. wire dirty? See page 4-8. Does Replace print unit. LCD display REPLACE (Unit is at the end of life)
Page 32: When Deep
(2) When deep Start Is density dial Adjust density dial. proper? See page 4-5. See pages 2-3 Replace print unit. and 3-20 to 21. 3 - 6...
Page 33: Black Vertical Line
(3) Black vertical line Start Is precharger Clean precharger wire. wire dirty? See page 4-9. Does LCD display Replace print unit. REPLACE (Unit is at the end of life) PARTS? See pages 2-3 and 3-20 to 21. See pages 2-3 Replace print unit.
Page 34: White Vertical Line
(4) White vertical line Start window of Clean the window glass of laser unit laser unit. dirty? See page 4-18. transfer corona Clean transfer corona wire. wire dirty? See page 4-8. Does LCD display Replace print unit. REPLACE (Unit is at the end of life) PARTS? See pages 2-3 and 3-20 to 21.
Page 35: Lacking Space At The Top And Bottom
(5) Lacking space at the top and bottom Start Within Move printing to area 5 mm from the edge beyond 5 mm. of paper? See pages 2-3 and 3-20 to 21. Is paper damp Change to new paper. and waved? See page 2-5.
Page 36: Black Point, White Point
(6) Black point, white point Start precharger Clean precharger wire. wire dirty? See page 4-9. transfer corona Clean transfer corona wire. wire dirty? See page 4-8. Appeared Replace print unit. synchronously? See pages 2-3 and 3-20 to 21. Every about Replace print unit.
Page 37: Second Printing (Ghost Printing)
(7) Second printing (ghost printing) Start Clean transfer corona transfer corona wire. wire dirty? See page 4-8. precharger electrode apart from high- Attach electrode. voltage electrode? cleaner dirty? Replace cleaner. See page 4-9. back-up roller in the fuser unit dirty? Improved by Does cleaning back-up...
Page 38: Dirty Back/Edge
(8) Dirty back / edge Start Is paper guide Clean paper guide. dirty? See pages 4-7 to 8. transfer corona unit Clean transfer corona unit. dirty? See page 4-8. Is precharger Clean precharger wire. wire dirty? See page 4-9. Does LCD display Replace print unit.
Page 39: Black
(9) Black Start precharger wire Clean precharger wire. dirty? See page 4-9. precharger Attach electrode. electrode apart from high- voltage electrode? See page 4-9. Does LCD display Replace print unit. REPLACE PARTS? See pages 2-3 and 3-20 to 21. –4 kV supplied Replace high-voltage from high-voltage power supply.
Page 40: White
(10) White Start connector of Connect connector. laser unit connected? See page 4-18. transfer corona Clean corona wire. wire dirty? See page 4-8. precharger electrode apart from high- Attach electrode. voltage electrode? Does LCD display Replace print unit. REPLACE (Unit is at the end of life) PARTS? See pages 2-3 and 3-20 to 21.
Page 41: Blur
(11) Blur Start transfer corona Clean corona wire. wire dirty? See page 4-8. Does LCD display Replace print unit. REPLACE (Unit is at the end of life) PARTS? See pages 2-3 and 3-20 to 21. See pages 2-3 Replace print unit. (Unit is defective.) and 3-20 to 21.
Page 42: Smudge
(12) Smudge Start Is density dial Adjust density dial. proper? See page 4-5. Is precharger Clean precharger wire. wire dirty? See page 4-9. transfer corona Clean transfer corona wire. wire dirty? See page 4-8. cleaner dirty? Replace cleaner. See page 4-9. Does LCD display Replace print unit.
Page 43: Error And Status Messages
3.3 ERROR AND STATUS MESSAGES This printer displays error and status messages on the LCD of the control panel. 16 characters by 2 lines of messages indicate information on errors and statuses in detail for maintenance personnel. The printer has also four indicators to display basic statuses: power-on, online, data presence in buffer, and error occurrence.
Page 44: Status Messages
Table 3-1 Error Messages (Continued) Message Causes and solutions MEMORY SHORTAGE Cause: Insufficient memory Solution: Add RAM board. MFF NOT INSTALL Cause: No MFF installed Solution: Install the MFF. MOTOR FAILURE n Cause: Malfunction in the feed motor, etc. Solution: If the error recurs, consult your dealer for service. NO PROCESS UNIT Cause: No print unit is installed.
Page 45: Table 3-3 Printer Status Messages
Table 3-3 Printer Status Messages Message Meaning FORM FEED The printer displays this message when you press with the FORM FEED DATA indicator off. The printer is printing data remaining in buffer. <<<INITIALIZE>>> The printer is initializing. This message appears whenever you turn on the printer.
Page 46: Resetting The Print Unit (Fuser Unit) Counter
3.4 RESETTING THE PRINT UNIT (FUSER UNIT) COUNTER Perform this operation whenever the print unit is replaced to reset the print unit counter, follow these steps: 1. Make sure the printer is offline. If necessary, press the POWER ONLINE DATA ERROR READY button to put the printer offline.
Page 47 4. Press the ENTER button to select this function. FORM READY FEED MENU RESET MENU TRAY – CONT. SELECT ENTER SELF PRINT RESET TEST FONT PAPER SIZE The message changes to <CLEAR WARNING> PRINT UNIT POWER ONLINE DATA ERROR *. The asterisk means that the print unit is expired. 5.
Page 48: Others
3.5 OTHERS The printer performs the following controls not under commands from the computer. (1) Fan control The fan 1 stops after three minute has elapsed since the last printing. The fan 2 stops after ten minutes has elapsed since the last printing. (2) Initial control of motor At initialization, the motor rotates when the temperature of the heater reaches 100°C and stops when the temperature reaches 170°C, then the printer goes ready to print.
Page 49: Chapter 4 Maintenance
Using the latest in electronic technology, the Laser Printer LN15 offers high reliability and ease of mainte- nance. The number of parts requiring lubrication and/or adjustment has been reduced. The LN15 printer has a self diagnostic function which briefly indicates the type of error using the indicators on the control panel if the printer malfunctions.
Page 50: Maintenance Tools
4.3 MAINTENANCE TOOLS Table 4-1 lists the tools required for maintenance. Table 4-1 Maintenance Tools Tool Name Q’ty Remarks Screwdriver (Phillips) For M3 and M4 Screwdriver (standard) For M3 Screwdriver (standard) For M4 Long-nose pliers Diagonal cutting pliers 4 - 2...
Page 51: Maintenance Levels
4.4 MAINTENANCE LEVELS Maintenance for the LN15 page printer is divided into two levels. Level 1 Level 1 maintenance can be done by the printer user. It includes cleaning and consumables replacement only. Level 2 Level 2 maintenance includes level 1 items (cleaning) plus replacement of PC boards, electrical units, and mechanical subassemblies.
Page 52: Parts Drawings
4.6 PARTS DRAWINGS This section shows the locations of the basic components. Shade cover Stacker-full sensor (cleaner assembly inside) Top cover Control panel (Paper stacker) Upper door Paper guides for manual feeding Multi-function feeder (MFF) Slide cover (Font/emulation card slot and RAM card slots inside) Front cover (opened)
Page 53: Figure 4-1 Basic Components-Continued
Toner bottle Print density dial Print unit Interior with the Upper Door Open Figure 4-1 Basic Components—Continued 4 - 5...
Page 54: Parts That Must Not Be Disassembled
CA02758-E400 Allowed only to separate OPC drum LN15X-AB from developing unit (OPC Drum) Toner bottle CA02758-E300 LN15X-AA 2 Bottles toner cartridges Heat roller unit CA04040-C941 For 120 VAC model LN15-AD ( Fusing Unit) Transfer charger unit CA04040-F450 4 - 6...
Page 55: Level 1 Maintenance
4.8 LEVEL 1 MAINTENANCE Level 1 maintenance includes only cleaning and consumables replacement that can be performed by the operator without removing any cover. 4.8.1 Cleaning First, check the inside of the printer for paper particles, dust, and other foreign matter. Remove them, if any, as explained in the table shown below.
Page 56: Figure 4-2 Cleaning The Paper Path
Figure 4-2 Cleaning the Paper Path Cleaning tool Figure 4-3 Cleaning the Corona Wire 4 - 8...
Page 57: Consumables Replacement
Cleaning tool Figure 4-4 Cleaning the Precharger Wire 4.8.2 Consumables Replacement Consumables of this printer are the toner bottle, print unit, and cleaner pad. The toner bottle and the print unit are easy to replace. So, this section explains how to replace the cleaner pad only. Follow these steps: Open the cover as follows: Push the engraved portion on the stacker to unlock and open the cover.
Page 58 2. Remove the cleaner as follows: Push down the handle of the cleaner and push forward it to unlock the cleaner. Slide the cleaner to the left and take its right end out of the opening, and then the left end. 3.
Page 59: Level 2 Maintenance
4.9 LEVEL 2 MAINTENANCE Level 2 maintenance includes maintenance such as lubrication and parts replacement. Level 1 maintenance should also be performed when level 2 maintenance is performed. 4.9.1 Replacement Precautions Keep assembly areas clean. Turn off the power to the printer and disconnect the power cord and interface cable before disassembly or assembly.
Page 60: Upper Cover Replacement
Upper cover replacement Removal 1. Open the upper door. 2. Remove three screws. Remove one screw to remove the rear cover. 4. Remove side cover R and side cover L. Remove three screws to remove the shield plate. Upper door Shield plate Upper cover Side cover R...
Page 61 6. Disconnect the control panel connector and the volume board connector. Bottom Front 4 - 1 3...
Page 62 7. Lift the upper cover in an upward direction to remove it while pressing four claws on the left and right of the upper cover using a standard screw driver as shown below: Installation Reverse the removal procedure. 4 - 1 4...
Page 63: Control Panel Replacement
Control panel replacement Removal 1. Remove the upper cover. (See Item (1)) 2. Remove the control panel while pressing the two claws on the left and right of the panel, using a standard screw driver. Installation Reverse the removal procedure. 4 - 1 5...
Page 64 Connectors and Cable Connections of the Control Board (Right Side View) Bottom Front 4 - 1 6...
Page 65 Cable Routes of the Pick-up Motor and the Cover-open Switch (Left Side View) Front Bottom 4 - 1 7...
Page 66: Laser Unit Replacement
Laser unit replacement Removal 1. Remove the upper cover. (See Item (1)) 2. Disconnect the connector from the laser unit. 3. Remove three screws to remove the frame ground cover and the laser unit. (There is a glass window on the bottom of this side.) (Frame ground cover is removed from the top of the laser unit) Installation Reverse the removal procedure.
Page 67: Fuser Unit Replacement
Fuser unit replacement WARNING : WAIT 5 MINUTES AFTER POWER DOWN BEFORE REMOVING THE FUSER UNIT Removal Open the shade cover. (See Section 4.8.2 Consumables Replacement.) Remove the cleaner assembly. (See Section 4.8.2 Consumables Replacement.) Remove side cover R. (See Item (1) Upper cover replacement.) Remove the shield plate.
Page 68 9. Disconnect the two connectors while pressing the connector lock with a standard screw driver as shown below. (The following illustration shows the side that faced to the front of the printer when the unit was installed.) 10. Remove two screws from the front of the unit to separate the fuser unit from the power supply board. 11.
Page 69: Power Supply Board Replacement
Power supply board replacement Removal 1. Remove side cover R and the shield plate. (See Item (1) Upper cover replacement.) 2. Disconnect the connector (for FAN2). (See Item (4) Fuser unit replacement.) 3. Remove the subassembly of the fuser unit and the power supply board. (See Item (4) Fuser unit replacement.) Turn the subassembly upside down 5.
Page 70: Fan 1 Replacement
FAN 1 replacement Removal 1. Remove the upper cover. (See Item (1) Upper cover replacement.) 2. Disconnect the connector from FAN1. To remove FAN1, lift it at an angle while pressing the lower mounting plate with a standard screw driver as shown below. FAN 1 Installation Reverse the removal procedure.
Page 71: Fan 2 Replacement
FAN 2 replacement Removal 1. Remove the subassembly of the fuser unit and the power supply board. (See Item (4) Fuser unit replacement.) 2. Remove two screws to remove FAN2 from the side of the subassembly. Power supply unit FAN 2 Installation Reverse the removal procedure.
Page 72: Control Board Replacement
Control board replacement Removal Remove the paper tray. 2. Remove side cover R and the shield plate. (See Item (1) Upper cover replacement.) 3. Disconnect the following all connectors: CNFAN1, CNFAN2, CNERS, CNTN, OPT, CNMM, CNRMP, CNCSTA, CNMFF, CNPS1, CNOP, and CNSTKF Remove seven screws and disengage the lower hook to remove the control board.
Page 73: High-Voltage Power Supply Board And Sensor Board Replacement
High-voltage power supply board and sensor board replacement Removal 1. Remove the paper tray. 2. Remove side cover R and the shield plate. (See Item (1) Upper cover replacement.) 3. Remove the control board. (See Item (8) Control board replacement.) 4.
Page 74 6. Remove five screws to remove the sensor board assembly. 7. Remove four screws to remove the high-voltage power supply board. Sensor board High-voltage power supply board Installation Reverse the removal procedure. Notes: When installing the sensor board, observe the order of fastening screws. 2.
Page 75: Main Motor Replacement
(10) Main motor replacement Removal 1. Remove the upper cover. (See Item (1) Upper cover replacement.) 2. Remove the control board. (See Item (8) Control board replacement.) 3. Remove FAN1. (See Item (6) FAN 1 replacement.) 4. Remove four screws to remove the main motor unit. Main motor unit Remove four screws and disconnect the cable to remove the main motor.
Page 76: Pick-Up Motor Replacement
(11) Pick-up motor replacement Removal 1. Remove side cover L. (See Item (1) Upper cover replacement.) 2. Remove the subassembly of the sensor board and the high-voltage power supply board. (See Item (9) High-voltage power supply board and sensor board replacement.) 3.
Page 77: Pick-Up Roller Replacement
(12) Pick-up roller replacement Removal 1. Remove the paper tray. 2. Remove side cover L. (See Item (1) Upper cover replacement.) 3. Remove the screw from the pick-up roller shaft FG plate and remove the FG plate. 4. Remove the bearing using a standard screw driver. 5.
Page 78 Installation Reverse the removal procedure. Note: When putting the pick-up roller on the shaft, face the tapered rib of the roller toward the pick-up motor. The following shows the relative position of pick-up roller and pick-up motor viewed from the bottom. Tapered rib Pick-up motor Pick-up roller...
Page 79: Resist Motor Replacement
(13) Resist motor replacement Removal 1. Remove the control board. (See Item (8) Control board replacement.) 2. Remove two screws to pull out the resist motor. Resist motor Installation Reverse the removal procedure. Reference: The resist motor derives from the resist roller (in contact with the feed roller) which momentarily blocks the paper feed from the pick-up roller to align the paper.
Page 80: Paper Feed Roller Replacement
(14) Paper feed roller replacement Removal 1. Remove the upper cover and side covers L and R. (See Item (1) Upper cover replacement.) Remove three screws, disengage three hooks, and disconnect the toner sensor connector to remove the front frame. Front frame Remove the right and left springs of the resist roller and lift the resist roller to remove it.
Page 81 6. Cut the hook of the gear at the right end of the paper feed roller using a diagonal cutting pliers. 7. Move the paper feed roller to the left and pull out the roller from the left end. Paper feed roller Bearing Bearing Gear...
Page 82 Guide sheets Guide sheets Rear Positioning edge Front Positioning edges 4 - 3 4...
Page 83: Transfer Charger Unit Replacement
(15) Transfer charger unit replacement Removal 1. Open the upper door. 2. Remove the transfer charger unit holding block at the left side of the transfer charger unit using a screw driver. 3. Open the claw on the left side of the base frame then lift the left side of the transfer charger unit using a screw driver to pull out the transfer charger unit toward the left side.
Page 84: Cover-Open Switch Replacement
(16) Cover-open switch replacement Removal 1. Remove the subassembly of the sensor board and the high-voltage power supply board. (See Item (9) High-voltage power supply board and sensor board replacement.) Disconnect the connector from the cover-open switch. 3. Disengage the two claws of the left guide (for the print unit) and pull the left guide out in an upward direction to remove it.
Page 85: Volume Board Replacement
(17) Volume board replacement Removal Remove the control board. (See Item (8) Control board replacement.) Remove the screw to remove the volume board from the bottom of the frame. Note: Use a short Phillips screwdriver. Installation Reverse the removal procedure. 4 - 3 7...
Page 86: Stacker-Full Sensor Board (Sfs Board) Replacement
(18) Stacker-full sensor board (SFS board) replacement Removal 1. Remove the upper cover. (See Item (1) Upper cover replacement.) 2. Remove the cable from the stacker-full sensor. 3. Remove the screw at the rear of the board. Installation Reverse the removal procedure. 4 - 3 8...
Page 87: Frame-2 Assembly Replacement
(19) Frame-2 assembly replacement Removal Remove the upper cover. (See Item (1)) Remove the stacker-full sensor board. (See Item (18)) From the rear of the printer, draw out the paper guide. Push outward the two hooks on the bottom of the frame-2 assembly to disengage them from the frame on which the laser unit is also mounted, and then lift the frame-2 assembly to remove it.
Page 88: Multi-Function Feeder Board (Mff Board) Replacement
(20) Multi-function feeder board (MFF board) replacement Removal 1. Remove side cover R. (See Item (1) Upper cover replacement.) 2. Remove the cable from the MFF board. 3. Remove the screw at the top side of the board. Installation Reverse the removal procedure. 4 - 4 0...
Page 89: Separator Assembly (Friction Pad Holder) Replacement
(21) Separator assembly (friction pad holder) replacement Removal 1. Remove the paper tray from the printer. 2. Place the paper tray upside down and push in the four points of the lower paper guide to release and remove it. 3. Push in the two hooks of the separator assembly (friction pad holder) to release and remove it. Remember to keep the spring.
Page 90: Print Unit Disassembly
(22) Print unit disassembly Disassembly The print unit consists of two main parts, developing unit and OPC drum unit. They can be easily separated from each other. Open the upper door and remove the print unit from the printer. 2. Remove the two clamps at both ends of the print unit. 3.
Page 91: Lubrication And Precautions
4.9.2 Lubrication and Precautions This section describes the lubrication procedures. The lubrication code is as follows: 2–SG–C–Y Lubrication cycle (every year) Lubrication quantity (apply oil thin and evenly) Lubricant type (Silicon grease) Item number Item number Serial number of lubrication point on the diagram 2.
Page 92: Base Frame Assembly
Base frame assembly 1-S-GC-O (Y611) Item No. Lubricant Lubricant Lubrication Part to be lubricated Remarks type quantity cycle Y621 bearing sections with 8 mm Apply both bearings. diameter of the paper feed roller Do not apply to roller surface and bearing sections with 10 mm diameter.
Page 93: Frame L Assembly
Frame L assembly Lubricant Lubricant Lubrication Item No. Part to be lubricated Remarks type quantity cycle - Y204 gear tooth surface and shaft - Y211 gear tooth surface and shaft - Y212 gear tooth surface and shaft - Y213 gear tooth surface and shaft - Y214 gear tooth surface and shaft - Y215 gear tooth surface and shaft 4-45...
Page 94: Fuser Unit
Fuser unit Lubricant Lubricant Lubrication Remarks Part to be lubricated Item No. type quantity cycle - Y651 gear tooth surface and shaft - Y662 gear tooth surface and shaft - Y663 gear tooth surface and shaft - Y664 gear tooth surface and shaft - Y665 gear tooth surface and shaft - Y692 gear tooth surface and shaft 4-46...
Page 95: Main Motor Unit
Main motor unit All gear circumference All gear circumference All gear circumference Lubricant Lubricant Lubrication Part to be lubricated Remarks Item No. type quantity cycle - Gear tooth surface and shaft (2) 4-47...
Page 96: Frame-2 Assembly
Frame-2 assembly Lubricant Lubricant Lubrication Remarks Item No. Part to be lubricated type quantity cycle - Y684 gear tooth surface and shaft - Y685 gear tooth surface and shaft - Y692 gear tooth surface and shaft 4-48...
Page 97: Guide Assembly
Guide assembly Lubricant Lubricant Lubrication Remarks Item No. Part to be lubricated type quantity cycle - Y692 gear tooth surface - Y692 shaft 4-49...
Page 98: Feed-2 Assembly
Feed-2 assembly Lubricant Lubricant Lubrication Remarks Item No. Part to be lubricated type quantity cycle - Bearing and edge of CA02758-Y682 4-50...
Page 99: Gear Box Assembly
Gear box assembly Lubricant Lubricant Lubrication Remarks Item No. Part to be lubricated type quantity cycle - Gear tooth surface and shaft (2) 4-51...
Page 100: Gear Box Lever Assembly
Gear box lever assembly Lubricant Lubricant Lubrication Remarks Part to be lubricated Item No. type quantity cycle - Y272 gear shaft 4-52...
Page 101: Developing Unit
(10) Developing unit Lubricant Lubricant Lubrication Part to be lubricated Remarks Item No. type quantity cycle - Gear bore (Y336) - Gear bore (Y310) - Gear bore (Y311) - Gear bore (Y312) - Gear bore (Y307) 4-53...
Page 102 Lubricant Lubricant Lubrication Remarks Item No. Part to be lubricated type quantity cycle Two places - Bearing slide (Y308) 4-54...
Page 103: Magnet Roller Bracket Assembly
(11) Magnet roller bracket assembly Lubricant Lubricant Lubrication Remarks Item No. Part to be lubricated type quantity cycle Two places - Y322 bore 4-55...
Page 104: Heat Roller Subunit
(12) Heat roller subunit Lubricant Lubricant Lubrication Remarks Item No. Part to be lubricated type quantity cycle - Y538 gear tooth surface - Y538 gear shaft 4-56...
Page 105: Heat Roller Base Unit
(13) Heat roller base unit Lubricant Lubricant Lubrication Remarks Item No. Part to be lubricated type quantity cycle Do not apply to the - G530 bearing (both sides) rubber roller. 4-57...
Page 106: Diagnostics
4.10 DIAGNOSTICS 4.10.1 Printing the Status Report This function prints a page that summarizes printer option settings and lists samples of resident fonts. The option settings include information on interface parameters, available emulations, characteristics of the selected font, and firmware and font versions. See Figure 4-5. The status report includes a warning message when some of consumables reach their end of life.
Page 107: Figure 4-5 Status Report (Fps Emulation)
Figure 4-5 Status Report (FPS Emulation) 4-59...
Page 108 Figure 4-6 Font Report (FPS Emulation) 4-60...
Page 109: Special Functions For Maintenance
4.10.4 Special Functions for Maintenance The Laser Printer LN15 provides special functions which are started by holding the + and – buttons pressed when the power is turned on. These functions are specially provided for service technicians only and useful for checking printer performance and changing printer internal settings during maintenance.
Page 110: How To Execute A Maintenance Mode
(2) How to execute a maintenance mode 1. Press and hold the + and – buttons while turning the printer on. Note: Be sure to keep holding the + and – buttons until the message appears. It takes about one minute (depending on warm-up time).
Page 111: Information Printed In Test Print Mode
= 63 (The maximum value remains unchanged.) = 322,560 seconds • [VALUE 3]: Printer name (used by PJL command) DIGITAL Laser P ===> DIGITAL Laser Printer LN15 • [VALUE 4]: Device ID for bi-directional Centronics Device ID DIGITAL Laser P [MFG:DIGITAL;]...
Page 112: Eeprom Clear And Eeprom Clear Extension
(4) EEPROM CLEAR and EEPROM CLEAR Extension When EEPROM CLEAR is executed, the printer settings return to the factory default valves. When the EEPROM CLEAR Extension is executed, the serial number of the printer is also cleared. (5) Re-entry of the serial number of printer If EEPROM Clear Extension is executed, the serial number of the printer must be re-entered.
Page 113: Figure 4-10 Maintenance Mode Operation Flowchart
1. Turn on the power switch while pressing and holding down Turn power ON while POWER SW ON while holding + and – buttons ON the + and – buttons until the message display indicates holding + and – SWs ON TEST PRINT.
Page 114: Chapter 5 Description Of Operation
CHAPTER 5 DESCRIPTION OF OPERATION 5.1 GENERAL This chapter explains the principles of operation of the LN15 laser page printer. A microprocessor controls all basic functions: interface, printing, and paper feeding. Figure 5-1 shows a block diagram of the laser printer LN15 .
Page 115: Mechanical Operation
5.2 MECHANICAL OPERATION This printer uses three motors to feed the paper and to drive the print unit. The pick-up motor drives the pick-up roller in the printer or in the multi-function feeder. The rotating direction of the motor determines which roller will be selected. The resist motor drives the paper feed roller.
Page 116: Figure 5-3 Structure Of The Paper Feed Drive Unit
Detailed Description (1) Paper feed drive mechanism Figure 5-3 details the paper feed drive unit. The stepping motor and the gear train are mounted on the metal frame. • The power of the pick-up motor gear is distributed to the pick-up roller of the paper tray or that of the multi-function feeder.
Page 117: Figure 5-4 Process Drive Unit
For paper feeding by the optional duplex unit, the following functions are performed: • Switching single-/double-sided printing • Switching face-up/face-down ejection • Reversing paper for second printing • Centering paper for second printing • Keeping paper waiting in the unit to time second printing (2) Process Drive Mechanism Figure 5-4 shows the process drive unit.
Page 118: Figure 5-5 Print Unit
(3) Fuser Unit The fuser unit consists of the heat roller unit and the back-up roller (fuser pressure roller). The heat roller unit has a halogen lamp, a heat roller, a temperature sensor, a thermal fuse, and supporting parts. The back- up roller rotates with the heat roller.
Page 119: Electrical Operation
5.3 ELECTRICAL OPERATION This section provides a brief description of various circuits and how they operate. 5.3.1 System Diagram Figure 5-6 is a diagram of the system. The Fujitsu MB86936 CPU (SPARC Lite) controls the entire printer and the data received from the interface. Figure 5-7 is a diagram of the connections.
Page 120: Figure 5-7 Connection Diagram
Figure 5-7 Connection Diagram...
Page 121: Main Controller
ERROR. The switches execute many functions like self test, reset, and menu mode. The laser printer LN15 has an expansion interface slot in which one of the three types of interface board can be installed. Ethernet interface boards, RS-232C interface boards, and LocalTalk interface boards are available.
Page 123: Cpu
The following are additional block information. (1) CPU The Fujitsu MB86936 CPU is a 32-bit architecture RISC processor developed by Fujitsu. It uses on-chip caching of codes (4K bytes), which allows prefetching of blocks of instructions from memory. It reduces the number of memory accesses and improves the instruction execution pipeline.
Page 124: Expansion Interface
(4) Expansion interface Several interface expansion boards are available such as the serial interface board. The controller has one connector for an expansion interface. The interface controller communicates with the CPU through the expansion board. (5) LSI-1 Host interface The printer has the Centronics parallel interface as the standard configuration. Its connector is located at the back of the printer.
Page 125 EEPROM (Nonvolatile RAM) control The controller has a non-volatile RAM, X24C04 or equivalent, with a capacity of 4K bits. The processor communicates with the non-volatile RAM via the LSI-1 serially. One bit is read or written at a time to the EEPROM by the I/O port and firmware. The read/write speed is thus slower in comparison with the RAM connected to the bus.
Page 126: Print Density Converter Lsi
(6) Print density converter LSI This LSI enables the 600-dpi laser unit to print horizontally 2400-dpi print quality. (7) Reset circuit The reset circuit initializes the printer when power is turned on. 5-13...
Page 127 5-14...
Page 128: Engine Controller Block Diagram
5.3.3 Engine controller Block Diagram Figure 5.10 shows a block diagram of the engine controller of the laser printer LN15. The engine controller controls the engine mechanism. The engine controller uses an 8-bit CPU. This CPU has a RAM and a timer unit. The timer has seven channels.
Page 129 5-16...
Page 130: Cpu
The external memory (ROM) , LSI, and I/O can be accessed through the multiplexed bus (AD0-AD7), address bus (A15-A8), and *RD/*WR/ASTB signals. The A/D converter in the CPU receives analog data from sensors and changes it to digital data. Sensors include the temperature sensor and the toner empty sensor.
Page 131: Rom
(2) ROM The ROM is 8-bit EPROM. It contains engine control programs and data tables. (3) LSI I/O expander The output ports are provided for controlling the high-voltage power supply, fan rotation, and eraser The input ports are provided for receiving signals from sensors. (stacker full, paper presence and paper size of paper trays 1 and 2, multi-function feeder status, etc.) b.
Page 132: Interface Communication Method
5.3.4 Interface Communication Method This section describes the operation of the interface control. (1) Centronics parallel interface The received data, DATA1 through DATA8, is stored to the internal FIFO memory of the LSI just after the falling edge of the *DSTB (Data Strobe) signal. At the same timing, the BUSY signal is turned on. A little later the *ACK (Acknowledge) signal is sent to the host computer and the BUSY signal is turned off.
Page 133: Rs-232C Interface (Option)
(2) RS-232C interface (option) The serial data sent to the input terminal of the interface circuit is converted to TTL level by the receiver IC and is applied to the UART, PC16550D LSI. The PC16550D converts the serial data to parallel data, and activates the *IRQ signal.
Page 134: Feit (Fujitsu Enhanced Imaging Technology)
(3) FEIT (Fujitsu Enhanced Imaging Technology) This technology improves the image quality. This technology automatically recognizes and smooths the jagged outlines of text (characters) and line art (drawings). In detail, the timing and pulse width of the video signal corresponding to print dots is control- led.
Page 135: Printing Method
5.3.5 Printing Method (1) Print control process The controller receives data from the host computer. The CPU inside the controller fetches the program from the ROM and reads data sent from the host computer. The CPU manages and processes the data according to the program.
Page 136: Video Data Transfer
(3) Video data transfer When the engine controller starts, the motor, and paper moves along the paper path. The engine controller checks sensors on the paper path. When the paper reaches the position from which video data must be prepared, the main controller starts the video data transfer from LSI-1. The LSI starts transferring bit-map data from the bit-map memory to the buffer memory in the LSI-1 under control of the DMA in the LSI-1.
Page 137: Power Saving Control
(6) Power saving control The laser printer LN15 saves power which is used for the heat roller in the fuser unit. It is done by stopping temperature control or reducing the temperature. This control is canceled when the printer receives print data from the host or issues the release command by firmware.
Page 138: Control Panel Control
5.3.6 Control Panel Control The control panel has a push-button switch and four LED indicators. The switch and indicators are connected to the controller board. Except for the “POWER” indicator, the switch and indicators are directly controlled by the controller board. The “POWER” indicator is directly connected to the +5 VDC line.
Page 139: Power Supply
5.3.7 Power Supply There CA02451-4265. power supply is used for 220 to 240 VAC. The power supply outputs +5 V for the logic circuits and +24 V for the printer mechanism drivers and the high-voltage power supply. It also controls the AC input voltage for the fuser unit’s heater. Figure 5-17 shows the block diagram of the power supply.
Page 140: Figure 5-17 Power Supply Block Diagram
Figure 5-17 Power Supply Block Diagram 5-27...
Page 141: Chapter 6 Replacement Parts
CHAPTER 6 REPLACEMENT PARTS Recommended spare parts Product number Section Remarks Upper cover subassembly CA04040-G551 4.9.1 (1) Pick-up roller assembly CA02758-G600 4.9.1 (12) Feed roller assembly CA02758-G612 4.9.1 (14) Cover-open switch CA02758-G127 4.9.1 (16) Main motor CA02758-0251 4.9.1 (10) Pick-up motor CA02758-0201 4.9.1 (11) Same as resist motor...
Page 142 Genicom. Americas are instructed to return defective repairable parts to SR126 (Contoocook N.H.). Europe is instructed to return defective repairable parts to SR821 (Nijmegan). AP operations to return defective parts to either GSO - Singapore or GSO - Sydney. OPTION DIGITAL P/N DESCRIPTION VENDOR P/N SOURCE...
Page 143 DIGITAL Laser Printer LN15 ARTS ATALOG EK-LN15X-SV.A01...
Page 145 This document is used for maintenance purpose only. The illustration of the part does not guarantee its availability...
Page 158 DIGITAL Laser Printer LN15 ARTS ATALOG PART EK-LN15X-SV.A01...
Page 159 This document is used for maintenance purpose only. The illustration of the part does not guarantee its availability...

Digital Equipment LN15 Service Manual & Parts List

Chapter 1 General Description

Chapter 2 Installation

Chapter 3 Troubleshooting

Chapter 4 Maintenance

Chapter 5 Description of Operation

Chapter 6 Replacement Parts

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