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Epson EPL-N1200 Service Manual

Epson EPL-N1200 Service Manual

Terminal printer
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EPSON TERMINAL PRINTER
EPL-N1200

SERVICE MANUAL

EPSON
4 0 0 6 8 3 8

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Summary of Contents for Epson EPL-N1200

  • Page 1: Service Manual

    EPSON TERMINAL PRINTER EPL-N1200 SERVICE MANUAL EPSON 4 0 0 6 8 3 8...
  • Page 2 All efforts have been made to ensure the accuracy of the contents of this manual. However, should any errors be detected, SEIKO EPSON would greatly appreciate being informed of them. The above notwithstanding SEIKO EPSON can assume no responsibility for any errors in this manual or the consequence thereof.
  • Page 3 POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS. WA FINING REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN. MARE CERTAIN THAT THE SOURCE VOLTAGE IS THE SAME AS THE RATED VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING PLATE.

  • Page 4: Safety Information

    SAFETY INFORMATION This printer is a page printer which operates by means of a laser. There is no possibility of danger from the laser, provided the printer is operated according to the instructions in this manual provided. Since radiation emitted by the laser is completely confined within protective housings, the laser beam cannot escape from the machine during any phase of user operation.
  • Page 5 A laser safety labels is attached on the outside of the printer shown below. For United State This laser product conforms to the applicable requirement of 21 CFR Chapter I, subchapter J. SEIKO EPSON CORP. Hirooka Office 80 Hirooka, Shiojiri-shi, Nagano-ken, Japan MANUFACTURED:...
  • Page 6 For Europe [Label inside printer] The following laser safely label will be attached inside the printer as shown below. For Denmark, Finland, Sweden, and Norway...
  • Page 7 Includes a step-by-step guide for product disassembly and assembly. CHAPTER 4. ADJUSTMENTS Includes a step-by-step guide for adjustment. CHAPTER 5. TROUBLESHOOTING Provides Epson-approved techniques for adjustment. CHAPTER 6. MAINTENANCE Describes preventive maintenance techniques and lists lubricants and adhesives required to service the equipment. APPENDIX Describes connector pin assignments, circuit diagrams, circuit board component layout and exploded diagram.
  • Page 8 REVISION SHEET Revision Page Issue Date Revision 1st issue December 9 1996 Rev. - vii -...
  • Page 9 TABLE OF CONTENTS CHAPTER 1. GENERAL DESCRIPTION CHAPTER 2. OPERATING PRINCIPLES CHAPTER 3. DISASSEMBLY AND ASSEMBLY CHAPTER 4. ADJUSTMENTS CHAPTER 5. TROUBLESHOOTING CHAPTER 6. MAINTENANCE APPENDIX . . . VIII -...

  • Page 10: Table Of Contents

    Chapter 1 General Description Table of Contents 1.1 FEATURES 1.2 SPECIFICATIONS 1.2.1 Basic Specifications ......... . 1-3 1.2.2 Electrical Specifications .
  • Page 11 List of Figures Figure 1-1. EPL-N1200 Exterior View ....... . 1-1 Figure 1-2.
  • Page 12 Table 1-1. EPL-N1200 Options ........

  • Page 13: Features

    EPL-N1200 Service Manual General Description 1.1 FEATURES The EPSON EPL-N1200 is a non-impact page printer that combines a semi-conductor laser with electro-photographic technology. Resolution is 600/300 DPI and print speed is 12 PPM. The main features are: Upward compatibility with the EPL-5600 No ozone generation Printing speed —...

  • Page 14: Table 1-1. Epl-N1200 Options

    General Description EPL-N1200 Service Manual Table 1-1 lists optional units available for the EPL-N1200. Table 1-1. EPL-N1200 Options Cat. No. Description Note Supports EPSONScript Level 2 ROM C83219 EPSONScript Level 2 ROM Module mode (PostScript Level 2 compatible) fonts and commands —...

  • Page 15: Specifications

    EPL-N1200 Service Manual General Description 1.2 SPECIFICATIONS This section provides statistical data for the EPL-N1200. 1.2.1 Basic Specifications Print method: Laser beam scanning and dry electro-photography Resolution: 600 DPI Printing speed: 12 PPM (letter/A4) First print time (A4/LT): Less than 16 seconds (A4/Letter; at Polygon-motor stop)

  • Page 16: Figure 1-2. Printable Area

    General Description EPL-N1200 Service Manual Usability of special papers: See Table 1-4. Table 1-4. of Special Papers Usability Input Output Envelopes Labels Card Stock Letterhead Standard built-in paper Face down tray Lower paper Face down cassette R: Reliable feeding and good image quality.

  • Page 17: Electrical Specifications

    EPL-N1200 Service Manual General Description 1.2.2 Electrical Specifications Table 1-5. Electrical Specifications Description 100 V Version 230 V Version Rated voltage 230 VAC 120 VAC Rated frequency range 60 Hz Input frequency range 63 Hz Power consumption Less than 700 W...

  • Page 18: Applicable Standards (Without Any Electrical Optional Unit)

    General Description EPL-N1200 Service Manual 1.2.6 Applicable Standards (without any electrical optional unit) Safety Standards 120 VAC model: UL 1950 Deviation 3, CSA 22.2 No.950 Deviation 3 230 VAC model (Europe): EN 60950 (IEC950), NEMKO (IEC950), CE marking (low voltage directive)

  • Page 19: Software Specifications

    EPSON PostScript Level 2 (Option) Note: The EPSON GL/2 mode is similar to the GL/2 mode included in the HP LaserJet 4 emulation. Table 1-6 shows the differences between EPSON GL/2 mode and the GL/2 mode in the HP LaserJet 4 emulation. While in EPSON GL/2 mode, the operator can enter GL/2 mode without sending the ESC %#B (Enter GL/2 mode) command.
  • Page 20 General Description EPL-N1200 Service Manual Table 1-7. Built-in Fonts (Scalable Fonts) Applicable Mode Resident Fonts HP LJ4 ESC/P 2 I239X GL/2 EPSON Roman EPSON Sans serif EPSON Prestige EPSON Script EPSON Gothic EPSON Presentor EPSON Orator Dutch 801 Roman SWC...
  • Page 21 EPL-N1200 Service Manual General Description Table 1-7. Built-in Fonts (Scalable Fonts; Cont’) Applicable Mode Resident Fonts HP LJ4, GL/2 ESC/P 2 I239X Courier Courier Bold SWC Courier Italic SWC Courier Bold Italic SWC Letter Gothic Roman SWC Letter Gothic Bold SWC...
  • Page 22 General Description EPL-N1200 Service Manual Font Symbol Sets and Character Tables HP LaserJet 4 Mode (bitmap fonts) : 28 symbol sets Roman-8 Norweg1 Roman Extension French HP German ItalianT JIS ASCII ECM94-1 Swedis2 ANSI ASCII Norweg2 French2 German HP Spanish...

  • Page 23: Lower Paper Cassette (Option) Specifications

    EPL-N1200 Service Manual General Description 1.2.10 Lower Paper Cassette (Option) Specifications Paper Size: A4 or Letter Paper Weight: 60 to 90 g/m (16 to 24 lb) Print Speed: 12 PPM (letter/A4) Paper Feed: Automatic feed delivery system. Cassette capacity up to 500 sheets...

  • Page 24: Interface Specifications

    General Description EPL-N1200 Service Manual 1.3 INTERFACE SPECIFICATIONS The EPL-N1200 is equipped with the following external interfaces: Parallel interface B Parallel interface C Serial interface on optional LocalTalk/Serial module LocalTalk interface on optional LocalTalk/Serial module 1.3.1 Parallel Interfaces There are two parallel interfaces: parallel interface B and parallel interface C. Each interface has his own connector.
  • Page 25 EPL-N1200 Service Manual General Description Table 1-8. Parallel Interfaces Pin Assignment Parallel-B Parallel-C Description Signal Name Signal Name STROBE is a strobe pulse used to read data from the host computer. The pulse width must be more STROBE STROBE than 0.5 sec. Normally it is HIGH, and data is latched at the trailing edge of this signal.

  • Page 26: Nibble (Reverse), Ecp Mode

    EPL-N1200 Service Manual 1.3.1.2 Nibble (Reverse), ECP Mode The reverse mode for EPL-N1200 supports the IEEE-P1284 nibble mode. This printer can run in reverse mode, in which the printer can inform the computer of its status by EJL and PJL commands.

  • Page 27: Figure 1-4. Parallel Interface State Switch Diagram

    EPL-N1200 Service Manual General Description Figure 1-4. Parallel Interface State Switch Diagram Figure 1-4 shows the parallel interface state switch diagram. Rev. A 1-15...

  • Page 28: Figure 1-5. Negotiation Timing Chart

    General Description EPL-N1200 Service Manual Figure 1-5 shows the timing chart for negotiation. Figure 1-5. Negotiation Timing Chart Note 1: The signal is set to HIGH when not sending data. The signal is set to LOW when sending data. Note 2: The signal is set to HIGH, if extension request value was 04h.

  • Page 29: Figure 1-7. Termination Timing Chart

    EPL-N1200 Service Manual General Description Figure 1-7. Termination Timing Chart Figure 1-7 shows the timing chart of termination. Note 1: The signal is HIGH when HB DNA. The signal is LOW when HB DA. Note 2: The signal is set to HIGH, if extension request value was 04h.

  • Page 30: Optional Serial Interface (Localtalk/Serial Module)

    General Description EPL-N1200 Service Manual 1.3.2 Optional Serial Interface (LocalTalk/Serial Module) The optional LocalTalk/Serial module contains serial interface with the following characteristics. Type: RS-232C or current loop Transfer system: Full duplex Synchronization: Asynchronous start-stop system Start-bit: 1 bit Stop-bit: 1 or 2 bits...

  • Page 31: Table 1-10. Serial Interface Pin Assignments

    EPL-N1200 Service Manual General Description Table 1-10. Serial Interface Pin Assignments Pin No. Description RS-232C Current Loop Signal Name I/O Signal Name Signal output by the printer. When the DTR signals HIGH, the RXD signal can be received by the printer. The SelecType setting doesn’t specify DTR control, the...
  • Page 32 General Description EPL-N1200 Service Manual Handshaking When the vacant area for data in the input buffer drops to 256 bytes, the printer outputs an X-OFF code or sets the DTR signal level to LOW, indicating that the printer cannot receive more data.

  • Page 33: Table 1-11. Localtalk Interface Pin Assignments

    EPL-N1200 Service Manual General Description 1.3.3 Optional LocalTalk Interface (LocalTalk/Serial Module) The optional LocalTalk/Serial module contains LocalTalk interface with the following characteristics. Type: LocalTalk Signal level: Same as RS-422 signal level Protocol: X-ON/X-OFF (cannot be combined with DTR control) DTR control (cannot be combined with X-ON/X-OFF) Transfer speed: 230.4 K BPS...
  • Page 34 EPL-N1200 Service Manual General Description Buttons On Line Switches the printer between on-line and off-line modes. While in SelecType mode, this button exits SelecType mode. Manual Feed Enters directly (a short cut) to manual feed; this setting is the same (On Line + ALT) as the manual setting in the PRINTING Menu of SelecType.

  • Page 35: Operating Instructions

    General Description EPL-N1200 Service Manual 1.4 OPERATING INSTRUCTIONS This section describes the functions performed through the control panel, such as test print, hexadecimal dump, and SelecType. 1.4.1 Control Panel The printer control panel gives you easy control over most common printer operations. The panel consists of a liquid crystal display (LCD), indicator lights, and buttons.

  • Page 36: Selectype Functions

    General Description EPL-N1200 Service Manual 1.4.2 SelecType Functions SelecType function on the printer control panel allows the user to control most of the printer’s functions, such as printing test pages, selecting a paper size, and changing the printer’s configuration. Enter SelecType mode by pressing the Menu or Item button.
  • Page 37 EPL-N1200 Service Manual General Description Table 1-12. SelecType Functions (Cont.) Menu Available Options Item (Changed by Menu (Changed by button) (Changed by Item button) button) (Set by Enter button) Italic, PcUSA, PcMultilin, PcPortugues, ESCP2 Menu CG Table PcCanFrenc, PcNordic, PcTurkish2, (Cont.)
  • Page 38 General Description EPL-N1200 Service Manual Table 1-12. SelecType Functions (Cont.) Menu Available Options Item (Changed by Menu (Changed by button) (Changed by Item button) button) (Set by Enter button) Emulation Menu Parallel B LJ4, ESCP2, FX, I239X, PS*4), GL2, Auto...
  • Page 39 EPL-N1200 Service Manual General Description SelecType Init Table 1-12. SelecType Functions (Cont.) Menu Available Options Item (Changed by Menu (Changed by button) (Changed by Item button) button) (Set by Enter button) Test Menu Status Sheet — LJ4 Font Sample —...
  • Page 40 General Description EPL-N1200 Service Manual *10) Can be selected only when Type-B I/F is installed. *11) Can be selected only when the lower paper cassette is set as unit 1. *12) Can be selected only when the lower paper cassette is set as unit 2.

  • Page 41: Service Mode

    EPL-N1200 Service Manual General Description 1.4.3 Service Mode This printer has the following three service modes: Hexadecimal Dump Mode EEPROM Format Error Recovery 1.4.3.1 Hexadecimal Dump Mode Hexadecimal dump mode is a useful tool for troubleshooting data control problems. To enter hexadecimal dump mode, turn on the printer while holding down the Form Feed button until “...

  • Page 42: Error Recovery

    General Description EPL-N1200 Service Manual 1.4.3.3 Error Recovery The LCD on the control panel unit indicates the printer status and error code if the printer has fatal error. CPU reset This function can be used without restarting the printer to attempt to recover from a fatal error (“...

  • Page 43: Display Of Messages

    EPL-N1200 Service Manual General Description 1.4.4 Display of Messages This printer displays three types of messages on the LCD: status messages, error messages, and power on messages. 1.4.4.1 Status Messages The LCD panel normally indicates the printer’s status and the software mode.

  • Page 44: Error Messages

    General Description EPL-N1200 Service Manual 1.4.4.2 Error Messages If any of the following errors occurs, it will be displayed on the LCD panel. The error must be cleared immediately using the measures shown in the following table. Table 1-15. Error Messages...

  • Page 45: Warning Message

    EPL-N1200 Service Manual General Description 1.4.4.3 Warning Message If any of the following warnings occurs, it will be displayed on the LCD panel. Table 1-16. Warning Messages Message Status Measures Occurs when Panel Lock=On is set by EJL. When the setting is on, press Menu,...

  • Page 46: Multi-User And Multi-Emulation

    General Description EPL-N1200 Service Manual 1.4.5 Multi-user and Multi-emulation This printer has a multi-user and multi-emulation functions. It can be connected simultaneously to and receive print codes from up to four different hosts or networks (when the optional module and I/F card are installed.).

  • Page 47: Emulation Mode Switch Function

    The four types of emulation switch functions described below are available on this printer. EJL: Eson Job Language This is EPSON’s original language system. It is able to skip among various destinations, as shown in Figure 1-11. PJL: Printer Job Language This is HP’s original language, which is available with the LaserJet 4 printer.

  • Page 48: Bi Resolution Improvement Technology

    EPL-N1200 Service Manual 1.4.7 Bi Resolution Improvement Technology The EPL-N1200 printer has BiRITech (Bi Resolution Improvement Technology), which is designed to improve print quality at 600 DPI and 300 DPI. Using this method, dot map data extracted from the image data and reassembled to improve print quality.

  • Page 49: Printer Initialization

    EPL-N1200 Service Manual General Description 1.4.8 Printer Initialization There are three ways to initialize this printer before entering the on line state. Reset Procedure This is performed by holding down the Alt and Reset buttons. The reset procedure aborts printing on the active interface only, then performs the reset.

  • Page 50: Toner Save Mode

    By installing additional SIMMs, you can increase the printer’s memory to a total of 64 MB, including the resident memory. EPSON supplies several types of memory option (SIMMs). Other SIMMs can be purchased from other vendors. Be sure the SIMM meets the requirements listed below.

  • Page 51: Main Components

    EPL-N1200 Service Manual General Description 1.5 MAIN COMPONENTS To simplify maintenance and repair, the main components of the EPL-N1200 has been designed for easy removal and replacement. The main components are: C205 MAIN Board Main controller circuit board C173 PROG Board*1)

  • Page 52: C205 Main Board

    General Description EPL-N1200 Service Manual 1.5.1 C205 MAIN Board The C205 MAIN board is a Main controller board. The primary functions of this board are receiving print data from the host, generating the print image (Main), and sending the print image to the engine controller via the Main interface.

  • Page 53: C173 Prog Board

    EPL-N1200 Service Manual General Description 1.5.2 C173 PROG Board The C173 PROG board, which is mounted on the C205 MAINboard, includes the program ROMs. It consists of four 4M-bit flash ROMs and its peripheral bus interface communicating with C205 Main board.

  • Page 54: Engine Coontroller Board

    General Description EPL-N1200 Service Manual 1.5.4 Engine Controller Board The engine controller board consists of an M37451 8-bit CPU (including a P-ROM) and a gate array. The board controls laser scanning (the polygon mirror drive motor), image synchronization, laser beam pulse width, and power.

  • Page 55: High-Voltage Supply Board

    EPL-N1200 Service Manual General Description 1.5.6 High-Voltage Supply Board The high-voltage supply circuit board converts the development bias, OPC drum charge bias, and image transfer bias. Do not touch VR1 and VR2 on the high-voltage supply board. These volumes are for factory setting only.

  • Page 56: Fusing Unit

    General Description EPL-N1200 Service Manual 1.5.8 Fusing Unit The fusing unit fixes the toner to the paper using heat and pressure. This unit has a heater lamp, thermistor, and thermostat. There are two types of fusing units, the 100/120 V type and the 230 V type.

  • Page 57: Lower Paper Cassette

    EPL-N1200 Service Manual General Description 1.5.10 Lower Paper Cassette The optional lower paper cassette allows you to feed up to an additional 500 sheets of A4 or letter-size paper into this printer. You can add the two lower papaer cassettes for the printer.
  • Page 58 Chapter 2 Operating Principles Table of Contents 2.1 ENGINE OPERATION 2.1.1 Print Process ..........2-2 2.1.1.1 Paper Feeding .
  • Page 59 Figure 2-3. Paper Feeding from Multi-Purpose Tray ..... 2-3 Figure 2-4. Paper Feeding from Lower Paper Cassette ....2-4 Figure 2-5.

  • Page 60: Engine Operation

    EPL-N1200 Service Manual Operating Principles 2.1 ENGINE OPERATION This section describes the functions and operating principles of the EPL-N1200 engine. Figure 2-1 shows the locations and names of the main engine components. 1. Paper Guide 16. Paper Take-up Sensor Lever 2.

  • Page 61: Print Process

    Operating Principles EPL-N1200 Service Manual 2.1.1 Print Process This section describes the print process from paper feeding to paper exit. Figure 2-2 shows a diagram of the print process. Figure 2-2. Print Process Diagram Rev. A...

  • Page 62: Paper Feeding

    EPL-N1200 Service Manual Operating Principles 2.1.1.1 Paper Feeding There are two methods of feeding paper into the printer. One uses the multi—purpose tray (standard tray), and the other uses one or two optional 500-sheet lower paper cassettes. Paper-out conditions are detected by the paper empty sensor, located above the paper tray or the cassette.

  • Page 63: Drum Charge

    Operating Principles EPL-N1200 Service Manual Lower Paper Cassette A maximum of 500 sheets can be loaded in the optional 500-sheet lower paper cassette. The paper size, however, must be a size that the casette is capable of handling. (The lower paper cassette unit can hold letter or A4 paper.)

  • Page 64: Laser Exposure

    EPL-N1200 Service Manual Operating Principles 2.1.1.3 Laser Exposure Laser exposure is the process of creating an invisible static electric image on the PC drum with laser beams emitted from the optical unit. The mirror scanner motor (polygon motor) rotates the six-sided mirror counterclockwise to produce a laser light scan.

  • Page 65: Image Transfer

    Operating Principles EPL-N1200 Service Manual 2.1.1.6 Image Transfer Image transfer is the process of transferring the toner image created on the PC drum to the paper during the developing process. This printer uses the roller image transfer method, instead of corona image transfer, as the image transfer process.

  • Page 66: Toner Empty Sensor

    EPL-N1200 Service Manual Operating Principles 2.1.1.9 Toner Empty Sensor Toner empty is detected by the toner empty LED and the photo sensor on the toner empty detection board. When there is enough toner in the imaging cartridge, light is not reflected from the toner empty sensor LED.

  • Page 67: Engine Control

    Operating Principles EPL-N1200 Service Manual 2.1.2 Engine Control This section describes engine control, the power supply board, and the high-voltage supply board. The engine is controlled by the engine controller board (PWB-A board). Figure 2-12 shows an engine controller connecting diagram.

  • Page 68: Main Motor Functions And Control

    EPL-N1200 Service Manual Operating Principles 2.1.2.1 Main Motor Functions and Control Power from the main motor (M1) drive is used for the P/C (photo conductor) drive, the developing drive, the fusing drive, the standard paper slot feeding drive, and the lower paper cassette (optional) feeding drive.

  • Page 69: Figure 2-14. Gear And Roller Positions

    Operating Principles EPL-N1200 Service Manual Figure 2-14. Gear and Roller Positions Table 2-1. Gears and Rollers No. of Gear No. of Gear Roller Name Roller Name Teeth Teeth Main Motor (M1) Paper Exit Roller 84/38/23 50/35 36/27 32/24 24/14 43/30...

  • Page 70: Fuser Control

    EPL-N1200 Service Manual Operating Principles Figure 2-15 shows the main motor drive circuit. The main motor (M1) is a four-phase stepping motor. This motor is controlled by the CPU (IC1) on the engine controller board (PWB-A). The power supply board (PU1) has a stepping motor driver IC. This IC drives the main motor (M1) with a constant current.

  • Page 71: Figure 2-17. Temperature For Fuser Control Procedure

    Operating Principles EPL-N1200 Service Manual The following figure shows the fuser temperature control operation. Figure 2-17. Temperature for Fuser Control Procedure There is a thermistor to the surface of the upper fusing roller to detect its temperature and to controls the fusing lamp On/Off operation. There are three temperature control modes for the upper fusing roller on the fusing unit.

  • Page 72: Scanner Mirror Motor Control

    EPL-N1200 Service Manual Operating Principles 2.1.2.3 Scanner Mirror Motor Control Figure 2-18 is the scanner mirror motor (M2) control circuit. The scanner mirror motor is driven while the scanner motor receives the POLYGON MOTOR (M2:ON) signal. Figure 2-18. Scanner Motor Control Circuit 2.1.2.4 Laser Diode Drive...

  • Page 73: Bias Voltages And Laser Drive Timing

    Operating Principles EPL-N1200 Service Manual 2.1.2.5 Bias Voltages and Laser Drive Timing Figure 2-21 is a diagram of the drum charge bias voltage, image transfer bias voltage, doctor blade bias voltage, and the developing bias voltage control circuit. These bias voltages are generated from the +24 VDC from the high-voltage supply board (HV1).

  • Page 74: Figure 2-22. Print Process

    EPL-N1200 Service Manual Operating Principles Figure 2-22 shows the print process. Figure 2-22. Print Process Figure 2-23 shows the start print sequence. The printer’s engine starts printing when the PRINT signal is received from the video controller board. Figure 2-23. Print Sequence (Start) Figure 2-24 is the end of the print sequence.

  • Page 75: Power Supply Circuit Function And Safety Protection

    Operating Principles EPL-N1200 Service Manual 2.1.2.6 Power Supply Circuit Function and Safety Protection The printer’s power supply board (PU1) supplies the +5 VDC and +24 VDC. The +24 VDC is used as the bias voltage supply, main motor (M1) drive, scanner mirror motor (M2) drive, fan motor (M3) drive, and solenoid drive.

  • Page 76: Video Controller Operation

    EPL-N1200 Service Manual Operating Principles 2.2 VIDEO CONTROLLER OPERATION The video controller section generates the video signals for the received data. The video controller section is separate in the C205 MAIN board and the control panel. The control panel is connected to the engine controller board (PWB-A), but is controlled by the C205 MAIN board, which sends the signals for the control panel through the engine controller board.

  • Page 77: Table 2-2. Functions Of C205 Main Board Main Elements

    Operating Principles EPL-N1200 Service Manual Table 2-2 lists the functions of the C205 MAIN board main elements. Table 2-2. Functions of C205 MAIN Board Main Elements Element Location Function The CPU, which operates at 20 MHz, manages the video MB86930 RISC CPU IC15 controller operation.

  • Page 78: Figure 2-28. Data Flow Diagram

    EPL-N1200 Service Manual Operating Principles Print data and commands transmitted from the host computer via parallel-B/C, serial/LocalTalk, or optional interfaces are read using the interrupt process of the CPU and stored in the DRAM input buffer. Data and commands in the input buffer are processed by the CPU, which then stores the printing bit map data (image data) in the V (video) -RAM (image buffer) of the DRAM.

  • Page 79: Reset Circuit

    Operating Principles EPL-N1200 Service Manual 2.2.1.1 Reset Circuit The entire system (CPU and external devices) can be initialized if the RESET signal (CPU pin 113) is active simultaneously. This circuit uses an M5193B IC to monitor the supply voltage if the voltage level less than 4.25 V is detected.

  • Page 80: Interrupt Control

    EPL-N1200 Service Manual Operating Principles 2.2.1.3 Interrupt Control The ASIC E05A93 determines the priority level of the interrupt and outputs it to terminals IRL0 - IRL3. Then an interrupt is sent to the CPU. When the IRL0-3 value is 1111B, the CPU process is a non-maskable interrupt process.

  • Page 81: Parallel-B Interface Circuit

    Operating Principles EPL-N1200 Service Manual 2.2.1.5 Parallel-B Interface Circuit Figure 2-32 shows the Parallel-B interface circuit block diagram. Data sent from the host computer is latched within the E05A93 by the STROBE signal. The E05A93 outputs the BUSY signal to stop the host computer from sending additional data.

  • Page 82: Video Interface

    EPL-N1200 Service Manual Operating Principles 2.2.1.7 Video Interface The ASIC E05B17 (IC16) maps the SRAM into a different memory space from system memory. The CPU transmits data from the V-RAM (in the system RAM) to the SRAM using the ASIC E05B17.
  • Page 83 Chapter 3 Disassembly and Assembly Table of Contents 3.1 GENERAL INFORMATION 3.1.1 Precautions for Disassembly/Assembly ......3-1 3.1.2 Tools .
  • Page 84 List of Figures Figure 3-1. Main Controller Board Removal (1) ......3-4 Figure 3-2. Main Controller Board Removal (2) ......3-4 Figure 3-3.

  • Page 85: General Information

    Disassembly and Assembly 3.1 GENERAL INFORMATION This chapter describes the disassembly/assembly procedures to be used for replacing the main assemblies of the EPL-N1200. 3.1.1 Precautions for Disassembly/Assembly Follow the precautions below when disassembling/assembling the printer. Disconnect the power cord before disassembling/assembling the printer.

  • Page 86: Small Parts

    Disassembly and Assembly EPL-N1200 Service Manual 3.1.3 Small Parts In the following sections, abbreviations are used for small parts, such as screws and washers. Tables 3-2 and 3-3 list these abbreviations. Table 3-2. Abbreviations Used for Screws Abbreviation Part Name...

  • Page 87: Service Checks After Repair

    EPL-N1200 Service Manual Disassembly and Assembly 3.1.4 Service Checks after Repair Check the repaired unit using the following list on completion of servicing. Table 3-4. Checks after Repair Item Location Check Point Check Control panel Do all LEDs, LCD, and buttons function normally?

  • Page 88: Disassembly And Assembly

    3.2 DISASSEMBLY AND ASSEMBLY This section describes and illustrates the procedures for removing and disassembling the components of the EPL-N1200. Cleaning is described in Chapter 6. The assembly procedures are not described, except for special notes where necessary, because assembly can be accomplished by performing disassembly in reverse.

  • Page 89: Control Panel Removal

    EPL-N1200 Service Manual Disassembly and Assembly 3.2.1.2 Control Panel Removal Open the top cover. Remove the imaging cartridge. Cover the imaging cartridge to protect it from light or place it in a dark area. Remove the main controller board. (Refer to Section 3.2.1.1.) 3.
  • Page 90 Disassembly and Assembly EPL-N1200 Service Manual Figure 3-5. Connectors on Engine Driver Board Rev. A...

  • Page 91: Engine Controller Board Removal

    EPL-N1200 Service Manual Disassembly and Assembly 3.2.2 Engine Disassembly This section describes disassembling the engine, including the engine controller board and power supply board. 3.2.2.1 Engine Controller Board Removal 1. 1. Open the top cover. Remove the imaging cartridge. Cover the imaging cartridge to protect it from light or place it in a dark area.

  • Page 92: Power Supply Unit Removal

    Disassembly and Assembly EPL-N1200 Service Manual 3.2.2.2 Power Supply Unit Removal Open the top cover. Remove the imaging cartridge. Cover the imaging cartridge to protect it from light or place it in a dark area. Remove one CC (M3 6) screw from the control panel then lift the panel forward.
  • Page 93 EPL-N1200 Service Manual Disassembly and Assembly Figure 3-9. Power Supply Unit Removal (1) Figure 3-10. Power Supply Unit Removal (2) Rev. A...
  • Page 94 Disassembly and Assembly EPL-N1200 Service Manual When you install the power supply unit into the printer, insert the tabs on the power supply unit frame into the holes in the bottom frame correctly. Figure 3-11. Power Supply Unit Installation 3-10...

  • Page 95: Interlock Switch Removal

    EPL-N1200 Service Manual Disassembly and Assembly 3.2.2.3 Interlock Switch Removal Open the top cover. Remove the imaging cartridge. Cover the imaging cartridge to protect it from light or place it in a dark area. Remove the main controller board. (Refer to Section 3.2.1.1.) 3.

  • Page 96: Optical Unit Removal

    Disassembly and Assembly EPL-N1200 Service Manual 3.2.2.4 Optical Unit Removal Do not touch the optical unit except at the time of replacement. Do not open the unit under any conditions. Do not remove the circuit board from the optical unit under any condition.

  • Page 97: Paper Empty Sensor Removal

    EPL-N1200 Service Manual Disassembly and Assembly Figure 3-14. Optical Unit removal 3.2.2.5 Paper Empty Sensor Removal Open the top cover. Remove the imaging cartridge. Cover the imaging cartridge to protect it from light or place it in a dark area.

  • Page 98: Toner End Sensor Removal

    Disassembly and Assembly EPL-N1200 Service Manual 3.2.2.6 Toner End Sensor Removal Open the top cover. Remove the imaging cartridge. Cover the imaging cartridge to protect it from light or place it in a dark area. Remove the optical unit. (Refer to Section 3.2.2.4.) Disconnect tabs for the toner end sensor and remove the toner end sensor.

  • Page 99: Paper Take-Up Solenoid Removal

    EPL-N1200 Service Manual Disassembly and Assembly 3.2.2.7 Paper Take-up Solenoid Removal Open the top cover. Remove the imaging cartridge. Cover the imaging cartridge to protect it from light or place it in a dark area. Remove the toner end sensor. (Refer to Section 3.2.2.6.) Remove the roller cover.

  • Page 100: High-Voltage Supply Board Removal

    Disassembly and Assembly EPL-N1200 Service Manual 3.2.2.8 High-Voltage Supply Board Removal 1. 1. Open the top cover. Remove the imaging cartridge. Cover the imaging cartridge to protect it from light or place it in a dark area. Remove the main controller board. (Refer to Section 3.2.1.1.) 3.
  • Page 101 EPL-N1200 Service Manual Disassembly and Assembly Figure 3-21. High-Voltage Supply Board Removal Rev. A 3-17...

  • Page 102: Main Motor Removal

    Disassembly and Assembly EPL-N1200 Service Manual 3.2.2.9 Main Motor Removal 1. 1. Open the top cover. Remove the imaging cartridge. Cover the imaging cartridge to protect it from light or place it in a dark area. Remove the main controller board. (Refer to Section 3.2.1.1.) 3.

  • Page 103: Paper Take-Up Sensor Removal

    EPL-N1200 Service Manual Disassembly and Assembly 3.2.2.10 Paper Take-up Sensor Removal Open the top cover. Remove the imaging cartridge. Cover the imaging cartridge to protect it from light or place it in a dark area. Remove the high-voltage supply board. (Refer to Section 3.2.2.8.) Remove the main motor.

  • Page 104: Fan Motor Removal

    Disassembly and Assembly EPL-N1200 Service Manual 3.2.2.11 Fan Motor Removal 1. 1. Open the top cover. Remove the imaging cartridge. Cover the imaging cartridge to protect it from light or place it in a dark area. Remove the main controller board. (Refer to Section 3.2.1.1.) 3.

  • Page 105: Fusing Unit Removal

    EPL-N1200 Service Manual Disassembly and Assembly 3.2.2.12 Fusing Unit Removal 1. 1. Open the top cover. Remove the imaging cartridge. Cover the imaging cartridge to protect it from light or place it in a dark area. Remove the main controller board. (Refer to Section 3.2.1.1.) 3.

  • Page 106: Fusing Lamp Removal

    Disassembly and Assembly EPL-N1200 Service Manual 3.2.2.14 Fusing Lamp Removal Remove the fusing unit. (Refer to Section 3.2.2.12.) Remove two CCB (M3x8) screws which secure both sides of the fusing unit cover, then remove both sides of the fusing unit cover.

  • Page 107: Thermistor And Thermostat Removal

    EPL-N1200 Service Manual Disassembly and Assembly 3.2.2.15 Thermistor and Thermostat Removal Remove the fusing unit. (Refer to Section 3.2.2.12.) Remove the fusing lamp. (Refer to Section 3.2.2.13.) Take the thermistor cable out of its guide in the fusing unit housing.

  • Page 108: Image Transfer Roller Removal

    Disassembly and Assembly EPL-N1200 Service Manual 3.2.2.16 Image Transfer Roller Removal Remove the fusing unit. (Refer to Section 3.2.2.12.) Remove the spacer. Slide the image transfer assembly to the left, lift up the right side, and remove the image transfer assembly.

  • Page 109: Paper Take-Up Roller Removal

    EPL-N1200 Service Manual Disassembly and Assembly 3.2.2.17 Paper Take-Up Roller Removal Open the top cover. Remove the imaging cartridge. Cover the imaging cartridge to protect it from light or place it in a dark area. Remove the fusing unit. (Refer to Section 3.2.2.12.) Remove the image transfer assembly.
  • Page 110 Disassembly and Assembly EPL-N1200 Service Manual Figure 3-35. Paper Pick Assy Removal Figure 3-36. Paper Take-Up Roller Removal 3-26 Rev. A...
  • Page 111 Chapter 4 Adjustment No adjustment is required in this product.
  • Page 112 Chapter 5 Troubleshooting Table of Contents 5.1 OVERVIEW 5.2 SELF-DIAGNOSTIC FUNCTION 5.3 TROUBLESHOOTING 5.3.1 Troubleshooting of Abnormal Operation ......5-2 5.3.2 Print Quality Anomaly .

  • Page 113: Self-Diagnostic Function

    Troubleshooting 5.1 OVERVIEW The EPL-N1200 has a sophisticated, built-in, self-diagnostic function that reduces troubleshooting time by identifying failed parts or components. This self-diagnostic test overcomes the troubleshooting problems for page printers, in which even a trivial failure can result in a serious print quality problem.

  • Page 114: Troubleshooting

    Troubleshooting EPL-N1200 Service Manual 5.3 TROUBLESHOOTING This section describes the troubleshooting of abnormal operations and print quality problems. 5.3.1 Troubleshooting of Abnormal Operation This section describes how to detect malfunctions, and determine the cause and suggests what actions to take for various types of malfunctions. Each paragraph refers you to a detailed troubleshooting table.

  • Page 115: Table 5-3. The Printer Does Not Operate At All

    EPL-N1200 Service Manual Troubleshooting Table 5-3. The Printer Does Not Operate at All Cause Step Checkpoint Finding Solution Connector CN1 on the Is connector CN1 on the Connect CN1 on power supply board may be power supply board power supply disconnected.

  • Page 116: Table 5-8. The Lcd Displays Feed Jam

    Troubleshooting EPL-N1200 Service Manual Table 5-7. The LCD Displays Illegal AUX I/F Card or Illegal I/F Module Cause Step Checkpoint Finding Solution The installed I/F card or I/F Can this printer use the Replace with a module may be illegal. (Check...

  • Page 117: Table 5-9. The Lcd Displays Feed Jam For Lower Paper Cassette

    EPL-N1200 Service Manual Troubleshooting Table 5-9. The LCD Displays Feed Jam for Lower Paper Cassette Cause Step Checkpoint Finding Solution Disconnect connector CN3 on PWB-B board and check the coil resistance between pin 1 and pin 2 on Replace the paper the disconnected cable side take-up solenoid.

  • Page 118: Table 5-12. The Lcd Displays Mem Overflow

    Troubleshooting EPL-N1200 Service Manual Table 5-12. The LCD Displays Mem Overflow Cause Step Checkpoint Finding Solution The optional SIMM may be Is operation OK after you Replace the SIMM. bad. remove the optional SIMM? Replace the C205 Standard RAM may be bad.

  • Page 119: Table 5-14. Main Motor Doesn't Rotate Correctly

    EPL-N1200 Service Manual Troubleshooting Table 5-14. Main Motor Doesn’t Rotate Correctly Cause Step Checkpoint Finding Solution Disconnect connector CN5 on the power supply board and check the coil resistance between: pin 1 and pin 2; pin 2 and pin 3; pin 4 and pin 5;...

  • Page 120: Table 5-17. The Lcd Displays Service Req. E

    Troubleshooting EPL-N1200 Service Manual Table 5-17. The LCD Displays SERVICE REQ. E0009 Cause Step Checkpoint Finding Solution The optical unit may be Replace the optical — — dead. unit. Replace the The engine controller — — engine controller board may be dead.

  • Page 121: Table 5-23. The Lcd Displays Service Req. C112X

    EPL-N1200 Service Manual Troubleshooting Table 5-23. The LCD Displays SERVICE REQ. C112X Cause Step Checkpoint Finding Solution The ROM (IC12 or IC13) on Replace the ROM Is operation OK after the C205 MAIN board may — (IC12 or IC13) on the you replace the ROM? be bad.

  • Page 122: Print Quality Anomaly

    Troubleshooting EPL-N1200 Service Manual 5.3.2 Print Quality Anomaly This section describes how to isolate a print quality problem from the possible causes. Table 5-29. Print Quality Anomaly Symptom Possible Cause Part Name Check Item Remedy Shake the imaging Check the toner level Low image density cartridge.
  • Page 123 EPL-N1200 Service Manual Troubleshooting Table 5-29. Print Quality Anomaly (Continued) Symptom Possible Cause Part Name Check Item Remedy Check whether the Blank print Imaging Reinstall the imaging imaging cartridge is cartridge cartridge. Poor installed properly. development Replace the HV1 HV1 board —...
  • Page 124 Troubleshooting EPL-N1200 Service Manual Table 5-29. Print Quality Anomaly (Continued) Symptom Possible Cause Parts Name Check Item Remedy White/black lines Clean the fusing Fusing roller — and bands roller. Improper fusing Replace the Thermistor — thermistor. Defective optical Replace the optical Optical unit —...
  • Page 125 EPL-N1200 Service Manual Troubleshooting Table 5-29. Print Quality Anomaly (Continued) Symptom Possible Cause Parts Name Check Item Remedy Black specks or dots Shake the imaging Imaging — cartridge. Replace the cartridge Poor imaging cartridge. development Replace the HV1 HV1 board —...
  • Page 126 Chapter 6 Maintenance Table of Contents 6.1 MAINTENANCE 6.1.1 User Maintenance ......... . . 6-1 6.1.1.1 Cleaning.
  • Page 127 6-ii Rev. A...

  • Page 128: Maintenance

    Maintenance 6.1 MAINTENANCE The EPL-N1200 is a page printer that use an electro-photographic printing method. Unlike with most impact or ink-jet printers, the key components in the electro-photographic process are integrated into an expendable cartridge (the imaging cartridge). Therefore, periodic replacement of the imaging cartridge is essential to ensure high-quality output.

  • Page 129: Consumable Replacement

    Maintenance EPL-N1200 Service Manual 6.1.1.2 Consumable Replacement This printer uses consumable imaging cartridge S051016. The life of this cartridge is 6000 pages when printing on A4 or letter size pages with a 5% print ratio continuously. If printed images become faint, remove the cartridge and gently shake it. This will distribute the toner and may make the images darker.

  • Page 130: Service Maintenance

    EPL-N1200 Service Manual Maintenance 6.1.2 Service Maintenance This section describes the periodic service maintenance and cleaning required. 6.1.2.1 Periodic Service Maintenance The following units require periodic service maintenance because they are subject to functional deterioration as the total number of printed pages increases, resulting in bad print quality.
  • Page 131 Appendix A Reference Materials Table of Contents A.1 CONNECTOR PIN ASSIGNMENTS A.1.1 Main Controller Board (C205 MAIN Board) ..... . . A-4 A.1.2 Engine Controller Board (PWB-A Board).
  • Page 132 EPL-N1200 Service Manual Appendix A A.1 CONNECTOR PIN ASSIGNMENTS igures A-1 and A-2 illustrate the interconnection of the primary components. Table A-1 gives the size and a description of each connector. Figure A-1. Video Controller Section Cable Connection Rev. A...
  • Page 133 Appendix A EPL-N1200 Service Manual Figure A-2. Engine Section Cable Connection Rev. A...
  • Page 134 EPL-N1200 Service Manual Appendix A Table A-1. Board Connector Summary Connector Description Pins Reference Main Controller Board (C205 MAIN Board) Connector for RAM SIMM 72 pins Table A-2 Connector for engine controller board 50 pins Table A-3 Connector for ROM SIMM...
  • Page 135 Appendix A EPL-N1200 Service Manual A.1.1 Main Controller Board (C205 MAIN Board) Table A-2. CN1 and 6 Pin Assignments Pin No. Signal Name Description 1,39,72 — Ground Data bus bit 0 DQ16 Data bus bit 16 Data bus bit 1...
  • Page 136 EPL-N1200 Service Manual Appendix A Table A-2. CN1 and 6 Pin Assignments (Continued) Pin No. Signal Name Description DQ24 Data bus bit 24 Data bus bit 9 DQ25 Data bus bit 25 DQ10 Data bus bit 10 DQ26 Data bus bit 26...
  • Page 137 Appendix A EPL-N1200 Service Manual Table A-3. CN2 Pin Assignments Pin No. Signal Name Description SWINT Switch interrupt — Ground LCDWRX Write strobe to LCD LCDCLK Clock to LCD SWRDX Read strobe to switch LEDWRX Write enable to LED Data bus bit 0...
  • Page 138 EPL-N1200 Service Manual Appendix A Table A-4. CN3 Pin Assignments Pin No. Signal Name Description 1,39,72 — Ground Data bus bit 0 Data bus bit 16 Data bus bit 1 Data bus bit 17 Data bus bit 2 Data bus bit 18...
  • Page 139 Appendix A EPL-N1200 Service Manual Table A-4. CN3 Pin Assignments (Continued) Pin No. Signal Name Description Data bus bit 24 Data bus bit 9 Data bus bit 25 Data bus bit 10 Data bus bit 26 Data bus bit 11...
  • Page 140 EPL-N1200 Service Manual Appendix A Table A-5. CN4 Pin Assignments Pin No. Signal Name Description 27,28,29,30 — +5 VDC 57,58,59,60 — +5 VDC 3,4,5,6 — Ground 41,42,43,44 — Ground RESET — Not used — Not used CMREQ — Not used WRRDY —...
  • Page 141 Appendix A EPL-N1200 Service Manual Table A-6. CN7Pin Assignments Pin No. Signal Name Description 1,2,3,4,5,6 — +5 V DC 19,20,21,22,23,24 GND — Ground — Ground READY — +5 VDC — Not used — Not used RESET Reset signal I/F disabled...
  • Page 142 EPL-N1200 Service Manual Appendix A Table A-7. CN11 Pin Assignments Pin No. Signal Name Description Data bus bit 0 Data bus bit 1 Data bus bit 2 Data bus bit 3 Data bus bit 4 Data bus bit 5 Data bus bit 6...
  • Page 143 Appendix A EPL-N1200 Service Manual Table A-7. CN11 Pin Assignments (Continued) Pin No. Signal Name Description Address bus bit 22 Address bus bit 23 RD/BY — Not used RESET Reset signal 75,76 — +5 V DC 1,2,3,4 — +5 V DC 37,38,77,78,79,80 VSS —...
  • Page 144 EPL-N1200 Service Manual Appendix A A.1.2. Engine Controller Board (PWB-A Board) Table A-8. CN4 Pin Assignments Pin No. Signal Name Description GND1 — Ground TONER LED LED power TONER LEVEL Toner empty signal — +5 VDC Table A-9. CN5 Pin Assignments Pin No.
  • Page 145 Appendix A EPL-N1200 Service Manual Table A-12. CN8 Pin Assignments Pin No. Signal Name Description 1, 2, 3 — +5 VDC 4, 5, 6 GND1 — Ground GND2 — Ground +24V — +24 VDC Table A-13. CN9 Pin Assignments Pin No.
  • Page 146 EPL-N1200 Service Manual Appendix A A.1.3. Power Supply Board (PU1 Board) Table A-15. CN4 Pin Assignments Pin No. Signal Name Description Fan control +24V — +24 VDC Table A-16. CN5 Pin Assignments Pin No. Signal Name Description Main motor phase B +24V —...

  • Page 147: Circuit Diagram

    Appendix A EPL-N1200 Service Manual 2 CIRCUIT DIAGRAM Figure A-3. C205 MAIN Board Circuit Diagram A-16 Rev. A...
  • Page 148 EPL-N1200 Service Manual Appendix A A.3 CIRCUIT BOARD COMPONENT LAYOUT Figure A-4. C205 Main Board Component Layout (Front) Rev. A A-17...
  • Page 149 Appendix A EPL-N1200 Service Manual Figure A-5. C205 Main Board Component Layout (Rear) A-18 Rev. A...

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