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Digital Equipment DECwriter 500i Service Manual

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DECwriter 500i
DECcolorwriter 520ic
(LJ500 and LJ520)
Service Manual
EK-LJ50E-SV.A01

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  • Page 1 DECwriter 500i DECcolorwriter 520ic (LJ500 and LJ520) Service Manual EK-LJ50E-SV.A01...
  • Page 2 First Edition - July 1994 The information in this document is subject to change without notice and should not be construed as a commitment by Digital Equipment Corporation. Digital Equipment Corporation assumes no responsibility for any errors that may appear in this document.

  • Page 3: Summary

    Some paragraphs are marked on a dark background and advise the use of particularly important situations or procedures. If these observations are not heeded, the printer could malfunction. Associated Documentation EK-LJ50*-UG DECwriter 500i & DECcolorwriter 520i - Installation and User Guide EK-LJ50*-RF Read-Me-First - DECwriter 500i EK-LJ52E-RF...

  • Page 4: Federal Communications Commission Radio Frequency Interference Statement

    Communications du Canada. This equipment conforms to the specifications of EEC directive 87/308 on the prevention and elimination of radio-frequency disturbances. NOTICE Digital Equipment Corp. reserves the right to modify the equipment described in this manual at any time and without notice.

  • Page 5: Table Of Contents

    Contents PREFACE ....................i Summary ...................... i Associated Documentation................i FEDERAL COMMUNICATIONS COMMISSION RADIO FREQUENCY INTERFERENCE STATEMENT ..............ii Contents ....................... iii 1. GENERAL 1.1 INTRODUCTION.................. 1-1 1.2 TECHNICAL CHARACTERISTICS............. 1-2 1.3 FIRMWARE AND CHARACTER GENERATORS ......1-5 Basic emulations................... 1-5 Optional emulations:................
  • Page 6 3. INSTALLATION 3.1 GENERAL INSTRUCTIONS ..............3-1 Mains power supply:................3-1 Environmental conditions: ..............3-1 Product positioning: ................3-1 3.2 UNPACKING ..................3-2 Packing check:..................3-2 3.3 CONNECTION TO THE MAINS............3-3 3.4 INSTALLING THE PRINT HEAD............3-3 3.5 INSERTING AN OPTIONAL MEMORY/FONT CARD ......3-5 3.6 PAPER FEED ..................
  • Page 7 5. DIAGNOSTICS AND TESTS 5.1 AUTODIAGNOSTICS AT POWER-ON ..........5-1 5.2 PRINT TEST WITH BLACK PRINT HEAD.......... 5-1 5.3 PRINT TEST WITH COLOR PRINT HEAD.......... 5-3 5.4 ”DATA SCOPE” PRINTOUT (HEX DUMP) ........5-4 Enabling the Data Scope printout:............5-4 Disabling the Data Scope printout:............
  • Page 8 9. PARTS REPLACEMENT 9.1 WARNING NOTES................9-1 9.2 REPLACING THE INK CARTRIDGE:..........9-2 9.3 DISASSEMBLING/ RE-ASSEMBLING THE PRINT HEAD: ....9-3 9.4 DISASSEMBLING / RE-ASSEMBLING THE CASING......9-4 9.5 DISASSEMBLING / RE-ASSEMBLING THE MAIN BOARD: .... 9-6 9.6 DISASSEMBLING/ RE-ASSEMBLING THE OPERATOR PANEL: ..9-8 9.7 DISASSEMBLING / RE-ASSEMBLING THE POWER SUPPLY BOARD: 9.8 DISASSEMBLING / RE-ASSEMBLING THE PAPER FEED MOTOR.

  • Page 9: General

    With these qualities they can compete with many Laser Printers. This service manual is intended for the DECwriter 500i monochrome inkjet printer with color option, and the DECcolorwriter 520ic color inkjet printer otherwise known as the LJ500 and LJ520. The only difference is that the color model is shipped with the color kit, and the monochrome model can be upgraded with the color kit, which has to be ordered separately.

  • Page 10: Technical Characteristics

    TECHNICAL CHARACTERISTICS Printing Technique Non-impact, bubble ink jet Print Head Disposable Black or Color Black Vertical resolution: 300 dpi Repetition frequency: 5000 Hz Nozzles: 50 (in 4 groups of 12 or 13) Vertical construction: 2 cols of 25 nozzles Water-resistant ink Ink cartridge life: 90,000,000 dots (400,000 characters,, average or 400 pages) Replaceable ink cartridges...
  • Page 11 Landscape orientation: - 112 characters with 10 cpi pitch - 134 characters with 12 cpi - 186 characters with 16.67 cpi Printing Speed DOS and similar environments: 400 cps in Draft 280 cps in NLQ 160 cps in LQ Windows and similar environments: DRAFT : up to 5 ppm (pages per minute) NLQ : up to 4 ppm Letter Quality : up to 3 ppm...
  • Page 12 Noise Emittance Less than 50 dBA in LQ mode Electrical Characteristics Voltage: -110 - 120 V; +/- 10% -120 - 240 V; + 6% / - 10% Frequency: 50 or 60 Hz Power absorbed: < 25 W Certification For mains voltage 115 V (USA and Canada):, Electromagnetic Compatibility FCC Class B “Certified”...

  • Page 13: Firmware And Character Generators

    FIRMWARE AND CHARACTER GENERATORS Basic emulations The basic firmware, contained on 1 Mbyte ROM assembled on the BA X100 board, emulates the HP Deskjet 500 and HP Deskjet 500C printers, with the corresponding character generators. The machine automatically makes the selection between the two emulations according to the type of cartridge installed (black ink cartridge: HP Deskjet 500;...

  • Page 14: Character Set

    Character set: The character sets in the machine and available for all resident or optional fonts are the following: CP 437 International; ROMAN 8; PC 8 Denmark/Norway; PC-850 Multilanguage/Latin 1; ECMA 94 LATIN 1 ISO 8859/1; ISO Nb 4 United Kingdom; ISO Nb 21 Germany EPSON 02;...
  • Page 15 Fonts for vertical page format Style Height Pitch Courier 6 / 12 5 / 10 / 20 Courier italic 6 / 12 5 / 10 / 20 Courier 6 / 12 8,33 / 16,67 / 33,34 Letter Gothic 6 / 12 5 / 10 / 20 Letter Gothic 6 / 12...

  • Page 16: Basic Emulation Optional Fonts

    Fonts for horizontal page format Style Height Pitch Courier 6 / 12 / 24 10 / 20 Courier italic 6 / 12 / 24 10 / 20 Courier 6 / 12 / 24 16,67 / 33,34 Letter Gothic 6 / 12 / 24 12 / 24 Letter Gothic 4,75 / 9,5 / 19...

  • Page 17: Times Nordic" Card (256 Kbytes)

    "Times Nordic" card (256 Kbytes) Style Height Pitch Page format Setup Times Nordic Proportional Vertical Times Nordic Proportional Vertical Times Nordic italic Proportional Vertical Times Nordic Proportional Vertical Times Nordic italic Proportional Vertical Times Nordic Proportional Vertical Times Nordic italic Proportional Vertical Times Nordic...

  • Page 19: Functional Description

    2. FUNCTIONAL DESCRIPTION GENERAL BLOCK DIAGRAM SERIAL INTERFACE (RS 232)CABLE: PARALLEL INTERFACE (CENTRONICS) MAINS MAINS GROUP: MEMORY CARD - TRANSFORMER 220-240V 50/60Hz 100-120V 50/60 Hz - FUSE - MAINS SWITCH CONSOLE ASF2 MAIN BOARD CARRIAGE MOTOR PAPER MOTOR PRINT HEAD ASF1 PAPER BLACK/COLOR...

  • Page 20: Printer Components And Internals

    Printer Components and Internals The following two figures show the main components and the internals the printer: Fig. 2-1 Main Components Functional Description 2-2...
  • Page 21 Front View Top Cover Paper insertion slot (for manual feed) Slot for optional emulation/font card Ink jet print head Print head carriage Print head selection lever Operator Panel Paper output tray Paper input tray ON/OFF switch Ink tube Ink slide Rear view Manual Feed paper insertion slot cover Power cable socket...
  • Page 22 Fig. 2-2 Internal Functional Groups Print Head Paper movement step motor ASF-2 connector Parallel interface connector Main Board Carriage transport DC motor PCMCIA card (optional) connector Black/Color selection lever Functional Description 2-4...

  • Page 23: Black Ink-Jet Head Functioning

    BLACK INK-JET HEAD FUNCTIONING Ink jet head Description: This consists of an interchangeable sealed container containing 50 print nozzles and an electric circuit including 50 miniresistors (Fig. 2-3). The nozzles are assembled on a Nickel and Gold composition called "electroformed". These have a conical structure, as illustrated in figure 2-3.

  • Page 24: How An Ink-Jet Works

    How an Ink-jet Works: Every single nozzle generates an ink bubble each time the relative resistor is powered for a few nanoseconds. When the resistor heats up, the ink touching it evaporates. This phenomena determines the formation of a bubble which quickly expands and compresses the remaining liquid inside the nozzle.
  • Page 25 NOZZLE Fig. 2-4a INITIAL STATUS Fig. 2-4b THE RESISTOR HEATS UP AND STARTS TO FORM VAPOR BUBBLE. THE INK EXITS FROM THE NOZZLE. Fig. 2-4c THE BUBBLE REACHES ITS MAXIMUM DIMENSION. Fig. 2-4d THE BUBBLE BREAKS DOWN AND AN INK BUBBLE IS EJECTED.

  • Page 26: The Nozzles

    The nozzles: The print nozzles (1-50) are placed on two columns, each containing 25 nozzles. They are placed in sequence on each column as illustrated in figure 2-5. In addition, the matrix is made up of: • A,C and B,D nozzles with 2.50 and 1.49 extreme print nozzle damper/equilibrator functions.
  • Page 27 Resistors actuation circuit specifications: The resistors are divided into four groups; two of which contain 12 resistors and two 13. Each group can be controlled by only one resistor at a time and therefore no more than 4 resistors can be controlled simultaneously. In addition, to avoid induction phenomenon’s between adjacent resistors/nozzles, the drive will be carried out in a particular sequence (Fig.

  • Page 28: Color Ink-Jet Head Functioning

    COLOR INK-JET HEAD FUNCTIONING Color Ink jet head Description: The color ink jet head has a replaceable sealed container that contains 51 printing nozzles, three liquid ink containers, one for each basic color, and an electric circuit with 51 miniresistors (Fig. 2-7a). The nozzles are divided as follows between the three basic colors: Yellow: 18 nozzles...
  • Page 29 Fig 2.7a - Ink jet Head for Color Inks Nozzle 50µm Fig 2.7b Nozzle Section 140-150µm Ink Sponges Resistor/Nozzle Pad Flexible Electric grid Ink filter Ink Cartridge Fig 2-7 Color head Functional Description 2-11...

  • Page 30: Ink Jet Printing Functioning Principle

    Ink jet printing functioning principle: See section 2.8 where this has already been dealt with. The nozzles: The print nozzles (1-51) are placed vertically on two columns, containing respectively 25 and 26 nozzles , and horizontally in three groups, one for each color.

  • Page 31: Resistor Enabling Circuit Specifications

    Resistor enabling circuit specifications: The resistors are divided into four groups; one contain 12 resistors and the other three 13. Each group can be controlled by only one resistor at a time and therefore no more than 4 resistors can be controlled simultaneously. To avoid induction phenomenon’s between adjacent resistors, the drives are carried out in the sequence illustrated in figure 2-9.

  • Page 32: Operating Controls

    OPERATING CONTROLS Operator Panel The machine console has seven buttons and eight light emitting diodes (LED). Online Install Color Ink/ Paper Supply Cartridge Paper Selection Device Tractor Manual ASF1 ASF2 LQ NLQ Draft Print Quality Portrait Paper Paper Landscape Load-Eject Micro- Advance Fig 2-10 Operator panel...

  • Page 33: Key Functions

    Key functions The key functions in the different machine operating modes are given below. Some functions require that more than one key must be pressed simultaneously or in sequence, either while the machine is functioning or when it is powered up. A ON LINE Toggles the printer between ON LINE and LOCAL operating modes...
  • Page 34 F PAPER LOAD-EJECT Controls the paper feed on the selected device. If the printer is in ON LINE and paper is present: -with manual or ASF feed and data to be printed in the buffer, but waiting for a Form Feed command, it forces the print of an unconcluded page and its ejection;...
  • Page 35 B INSTALL CARTRIDGE + D PAPER DEVICE/ PRINT QUALITY Keeping these two keys pressed at machine power on, the printer configuration parameters set in the factory will be restored (default parameters). B INSTALL CARTRIDGE + G PAPER MICRO-ADVANCE Pressing these two keys simultaneously regardless of the printer status, a machine reset is carried out (any printing operation in progress is canceled and the data in the buffer is lost).

  • Page 36: Color Selection Lever

    COLOR SELECTION LEVER The color selection lever is on the right-hand side of the machine, under the upper cover compartment. The lever is usually directed towards the operator (BLACK setting), and in this position the printed is equipped with a black ink head. This lever is only used to indicate the variation to the machine when a color head is installed.

  • Page 37: Installation

    3. INSTALLATION GENERAL INSTRUCTIONS The following rules must be observed to guarantee optimum printer functioning and to avoid service for reasons not attributed to the product: Mains power supply: The LJ 500 and LJ 520 printers conform to the safety standard, ergonomics and the electromagnetic interference (EMI) imposed by the following organizations: Safety:...

  • Page 38: Unpacking

    UNPACKING Packing check: Unpack the contents of the carton and check them against those illustrated in the following. Retain the carton and packing materials for future use should you need to relocate the printer at any time. If anything is missing or damaged, call your supplier immediately. Fig 3-1 Package Contents Printer Driver diskette...

  • Page 39: Connection To The Mains

    CONNECTION TO THE MAINS Connect the mains power supply cable supplied with the printer first making sure that the voltage indicated on the label plate corresponds to that of the local network. To ensure optimal machine operation, check with the instructions given in section 3.1.
  • Page 40 6. Holding the cartridge by the grip, remove the protective label from the nozzles. 7. Insert the cartridge in place, pushing it first down and then forward. Fig. 3-3 Inserting the head into the machine 8. Close the machine upper cover. 9.

  • Page 41: Inserting An Optional Memory/Font Card

    INSERTING AN OPTIONAL MEMORY/FONT CARD The memory/font cards handled by this printer conform to PCMCIA standard (Personal Computer Memory Card International Association). The cards contain a firmware emulation or an EPROM relevant to a character font group or an additional memory (RAM or Flash EPROM). The card can be added after the printer has been installed.

  • Page 42: Paper Feed

    PAPER FEED ASF sheet feed: The sheets are fed into the machine using the ASF drawer on the machine. The drawer can hold 120 sheets of 80 g/m paper. Sheets from 60 g/m to 90 g/m can be handled. The printable area for the most common formats A4 and Letter/Legal can be obtained from the table below.
  • Page 43 For ASF sheet feed, follow this procedure: Take the ASF drawer from the machine Insert the sheets (maximum 120) into the drawer Adjust the drawer side guides (1) according to the width of the sheets Fig. 3-5 Drawer guides adjustment Insert the drawer into the machine If A5 or Letter size format is used, insert the paper stop in the appropriate holes in the drawer...

  • Page 44: Manual Insertion

    Manual insertion: Manual paper feeding is through the rear slot on the machine which is accessed by lifting the rear cover. The machine will accept sheets and envelopes up to 135 The printable area for the most commonly used envelope sizes: C5, DL, C#10 and C6 can be obtained from the table below.
  • Page 45 To insert the document manually, follow this procedure: Lift the printer rear cover to have access to the manual feed slot Fig. 3-6 Opening the rear cover -With the printer switched on, insert the document into the manual feed slot so that it touches the feed rollers.

  • Page 46: Sprocket Installation

    SPROCKET INSTALLATION The sprocket is an option that can be installed by the operator. It is fitted into the machine near to the manual feed slot, removing the rear part of the casing and taking out the prepared marked part so as to have access to the movement socket.

  • Page 47: 2Nd Paper Tray (Asf2) Installation

    2nd PAPER TRAY (ASF2) INSTALLATION ASF2 is an optional 2nd paper tray that can be installed by the operator. It is positioned under the machine base and is connected to the motherboard by a cable which has to be connected. Detailed instructions for the installation are provided in the package together with the device.

  • Page 48: Serial Interface Installation

    3.10 SERIAL INTERFACE INSTALLATION The serial interface is an option that can be installed by the operator. Detailed instructions for the installation are supplied in the package with the device. With the serial interface option connection to the system can be either serial or parallel.

  • Page 49: Print Test

    3.11 PRINT TEST To verify the correct printer installation the print test should be made, as described below: Feed the ASF drawer with paper, preferably size A4 Switch off the machine then switch on keeping the ON LINE key pressed during power up. The printer will start to feed the paper and print the test on four sheets.
  • Page 50 A 36 pin connection cable is supplied with the system, and this must not exceed 2.5 metres. The figure below shows the 36 pin Amphenol connector for the parallel interface connection, indicating the transmission signals. 19 GROUND E 01 STROBE 0 02 20 GROUND DATA 0...

  • Page 51: Switching Off The Printer

    3.13 SWITCHING OFF THE PRINTER Before switching off the printer, ensure that the head is positioned to the far right of the guide rail. This status is automatically obtained every time the printer is inactive for a few seconds, hermetically sealing the print nozzles and thus preventing the ink inside the nozzles from drying up.

  • Page 52: Default Parameters

    DEFAULT parameters To verify the parameters set up in the factory the print test can be run, printing the four pages that show the default setting and the print fonts available. To run this test, see section 5.2. The following values are set up in the factory: Paper Format Paper Device ASF1...

  • Page 53: Programmable Parameters

    PROGRAMMABLE PARAMETERS This chapter contains the printer parameters that can be programmed and the values that each of them can assume with the description for the creation of a parameters configuration file: Parameter Description Note PaperFormat Letter Legal US Exec COM 10 Tractor PapDev...
  • Page 54 Parameter Description Note PerSkip Paper skip disabled (TOF= 0, BOF= printing continues to the last line of the page) Paper skip enabled (TOF= 12.7 mm - 0.5"; BOF= 12.7 mm - 0.5") TextScale Nominal line feed value Reduced line feed value to increase the number of lines per printed page AlwaysBidir Bi-directional print, if possible...
  • Page 55 Parameter Description Note TypeStyle Courier Upright Portrait 10 cpi 12 pts Courier Italic Portrait 10 cpi 12 pts Courier Upright Portrait 16,67 cpi 12 pts Letter Gothic Upright Portrait 10 cpi 12 pts Letter Gothic Upright Portrait 12 cpi 12 pts Letter Gothic Italic Portrait 12 cpi 12 pts Letter Gothic Upright Portrait 16,67 cpi 9,5pts...
  • Page 56 Parameter Description Note Charset The selected character set remains unchanged CP 437 International HP Roman 8 PC-8 Denmark/Norway CP 850 (Multilingual) ECMA 94 Latin ISO 4 United Kingdom ISO 21 Germany ISO 69 France ISO 15 Italy ISO 60 Norway 1 ISO 61 Norway 2 ISO 11 Sweden Names ISO 10 Sweden...
  • Page 57 Parameter Description Note CP 857 Turkey ISO 8859/9 Turkey PC Win Turkish Windows 3.1 CP 866 Cyrillic CP 855 Cyrillic ISO 8859/5 Cyrillic PC Win Cyrillic Windows 3.1 CP 210 Greece CP 851 Greece ISO 8859/7 Greece PC Win Greek Windows 3.1 CP 862 Hebrew ISO 8859/8 Hebrew Slovenia...

  • Page 58: System Parameter Set-Up

    SYSTEM PARAMETER SET-UP If it is necessary to change a configuration parameter, the procedure is as follows: • With the PC and the aid of an ASCII based word processor or a file editor, create a file "XXXX" to write the parameters and descriptions that you want to enter.

  • Page 59: User Maintenance

    4. USER MAINTENANCE No special preventive maintenance is required. However after any servicing it is advisable to ensure there is no trace of ink on the print head nozzle surface. If there is, clean and if necessary, replace the rubber cap and the cleaning wiper.

  • Page 60: Ink Reset ( "Prime" ) Black Head Only

    Ink reset ( ”PRIME” ) Black Head Only: This must be carried out when one or more nozzles no longer print. This operation is not required when the initial characters of the printout are incomplete, as this is probably caused by the printer having been left inactive for a certain period. Ink reset is not required for the color heads, as there is an automatic nozzle cleaning cycle that takes place at each head change and machine power on.

  • Page 61: Black Ink Jet Head Cleaning And Maintenance

    Black Ink jet head cleaning and maintenance: The ink jet head requires particular care as far as cleaning the nozzles are concerned. Given their particular structure, the nozzles are likely to get clogged with dust or, if exposed, dried ink. Some useful tips to guarantee the best use of the head are listed below: •...
  • Page 62 Color head cleaning and maintenance: The color head also requires particular care as far as cleaning the nozzles are concerned. Given their particular structure, the nozzles are likely to get clogged with dust or, if exposed, dried ink. Some useful tips to guarantee the best use of the head are listed below: •...

  • Page 63: Diagnostics And Tests

    5. DIAGNOSTICS AND TESTS AUTODIAGNOSTICS AT POWER-ON The machine firmware automatically tests the main functions of the machine at each power on. If any faults are found they are indicated by all the LED s blinking on the console (see Section 6 for LED fault indications). PRINT test with black print head This test verifies the correct functioning of the head, it displays the machine operating parameters and visualizes the printer character fonts available .
  • Page 64 To run this test, proceed as follows: Load the ASF drawer with paper, preferably A4 Switch off the machine then switch on keeping the ON LINE key pressed during the power on. The printer will start to feed the sheets and print the test. The first page (as would be printed with a black print head) is shown below: Diagnostics and Test 5-2...

  • Page 65: Print Test With Color Print Head

    To interrupt the test, press ON-LINE, then press again to continue printing. To stop the test before it is finished, switch off the machine or make a reset (press the INSTALL CARTRIDGE key followed by PAPER MICRO-ADVANCE). The test ends automatically after the four pages have been printed and the machine remains in ON LINE.

  • Page 66: Data Scope" Printout (Hex Dump)

    ”DATA SCOPE” PRINTOUT (HEX DUMP) This function prints any incoming character with the corresponding ASCII codes (hexadecimal), thus enabling a verification of the receiving of the control codes sent by the system. Enabling the Data Scope printout: Switch off the printer, press the INSTALL CARTRIDGE key and keeping the key pressed switch the printer on again.

  • Page 67: Diagnosis Guidelines

    DIAGNOSIS GUIDELINES The diagnosis guidelines list some of the more important error symptoms and provides a description of the probable causes. These faults, the symptoms and probable causes have been divided into the following groups: Faults at power-on: Includes all faults corresponding to Vac/Vdc power supply circuits and control circuits.
  • Page 68 Print quality faults Includes all faults which do not block the printer but reduce the print quality considerably. If characters are printed incomplete with one or two dots missing (the print test described in section 5.2 pin points these characters) first clean the nozzles as described in section 7.
  • Page 69 Data transmission faults: Check that the interface cable is the correct type and that it is not too long (2.5 meters for the parallel cable). Check the connections to the PC and the printer. Check that the printer configuration parameters are coherent with those required by the utility software installed on the PC.

  • Page 71: Fault Conditions And Meaning

    6. FAULT CONDITIONS AND MEANING Operational Status The operational status of the printer can be initially determined by the condition of the LEDs on the operater panel which is shown below. The LEDs, labelled 1 to 8, indicate the machine status, end of paper/ink or an error message.

  • Page 72: Fault Conditions And Indications

    Fault Conditions and Indications The table below show the machine fault status as indicated by the LEDs. The operational status of the machine is given in Section 2. MEANING Power on fault Carriage reset fault Electronic board fault Paper fault End of ink/No head Wrong ink cartridge installed...

  • Page 73: Normal Conditions And Indications

    Normal Conditions and Indications MEANING LOCAL ON LINE ON LINE receiving data Black cartridge installed Color cartridge installed Vertical page format Horizontal page format Print quality : LQ Print quality : NLQ Print quality : DRAFT Paper feed: Manual Paper feed: ASF1 Paper feed :ASF2 Paper feed : Sprocket Multipurpose device...

  • Page 75: Mechanical Adjustments

    MECHANICAL ADJUSTMENTS PRINT HEAD AND THE WRITING SURFACE GAP The distance between the head and the writing surface and the parallelism between the print matrix and the writing surface are obtained using a specific tool when assembling the printer. If the print quality should deteriorate along the writing line, it is advisable to check the distance and if necessary, adjust the gap between the print head and printing surface.

  • Page 76: Adjusting The Tension Of The Paper Feed Motor Belt

    ADJUSTING THE TENSION OF THE PAPER FEED MOTOR BELT The tension of the paper feed motor belt is adjusted during printer assembly, using a specific tool. If, during paper feeding irregular line feeds, deformed characters or white stripes along the printing line occur, check the belt tension and, if necessary, correct it. Procedure: With all parts mounted, loosen the motor fixing screws so that the motor is slightly blocked.

  • Page 77: Bi-Directional Print Alignment Adjustment

    BI-DIRECTIONAL PRINT ALIGNMENT ADJUSTMENT If the printout is badly aligned due to the bi-directional printing, the defect can be corrected by means of the following procedure: Make sure there is paper in the machine. Power up the printer keeping the PORTRAIT-LANDSCAPE key pressed.

  • Page 79: Electrical Interconnections

    8. ELECTRICAL INTERCONNECTIONS 8.1 MAIN BOARD MAIN COMPONENTS Paper Motor Console Parallel Interface Print Head Print Head Power Supply Carriage Motor ASF2/MPD Memory Card J10 Black / Color Head and Paper Presence Photosensors IC1 Paper Motor Driver IC3 8 Bit Buffer IC4 Operational Amplifier IC5 Head Driver IC6 Head Driver...

  • Page 80: Power Supply Board

    POWER SUPPLY BOARD Electrical Interconnections 8-2...

  • Page 81: Power Supply Circuit On Main Board

    POWER SUPPLY CIRCUIT ON MAIN BOARD Electrical Interconnections 8-3...

  • Page 82: Connector Signals

    CONNECTOR SIGNALS Main Board Connector PAPER MOTOR OUT1A OUT1B OUT2A OUT2B CONSOLE LED 8 LED 7 LED 6 LED 5 LED 4 LED 3 LED 2 KEY G KEY F CLV0 KEY E CLV1 KEY D CLV2 KEY C CLV3 KEY B CLV4 KEY A...
  • Page 83 PAPER /HEAD PHOTOS PAPER ASF 2 ASFCMD +30V CARRIAGE MOTOR OUT1 OUT2 POWER SUPPLY /CD1 AD11 +30V AD12 AD13 +30V AD14 /CE1 AD15 AD10 /CE2 VPP1 VPP2 /REG /BVD2 /BVD1 AD10 /CD2 MEMORY CARD Electrical Interconnections 8-5...

  • Page 85: Parts Replacement

    9. PARTS REPLACEMENT 9.1 WARNING NOTES AS A SAFETY PRECAUTION, BEFORE STARTING ANY DISASSEMBLING OPERATION SWITCH THE PRINTER OFF AND DISCONNECT IT FROM THE POWER SUPPLY MAINS. - all operations should be carried out in clean, free areas. - before switching the printer off, make sure that the head is in the parked position (Carriage on the right).

  • Page 86: Replacing The Ink Cartridge

    9.2 REPLACING THE INK CARTRIDGE: Open the cover to have access to the print head. Press the INSTALL CARTRIDGE key on the console to bring the print head to the change cartridge position. Do not remove the print head. Remove only the ink cartridge using the black lever on the print head.

  • Page 87: Disassembling/ Re-Assembling The Print Head

    9.3 DISASSEMBLING/ RE-ASSEMBLING THE PRINT HEAD: Open the cover to have access to the print head. Press the INSTALL CARTRIDGE key on the console to bring the head to the change cartridge position. Release and remove the head, together with the ink cartridge. To do so, grasp the head pulling it towards the rear and remove it from its position.

  • Page 88: Disassembling / Re-Assembling The Casing

    9.4 DISASSEMBLING / RE-ASSEMBLING THE CASING Take out the paper drawer. Take off the rear cover (A), carefully remove the paper conveyor (B) by pushing the side levers gently inward. Release the catch (C) in the center on the inside of the casing. Parts Replacement 9-4...
  • Page 89 Turn the machine over and release the catches (2), (3), (4) and (5). Carefully lifting the casing, disconnect the console flat cable from its connector (6) on the motherboard and remove the protective strip (7) from the board shield. Parts Replacement 9-5...

  • Page 90: Disassembling / Re-Assembling The Main Board

    9.5 DISASSEMBLING / RE-ASSEMBLING THE MAIN BOARD: Remove the casing (section 9.4). Disconnect the head flat cables from connectors (1) and (2). By means of clasps (3) and (4) release the board rack and remove it upwards. Parts Replacement 9-6...
  • Page 91 Unplug any connectors that are still connected. Remove the protective shield to have access to the board and its components. To replace the board, remove screws (5), (6), (7) and (8), (9). _______________________Note:_________________________ When replacing the mother board, update the firmware release as described in section 8.2.

  • Page 92: Disassembling/ Re-Assembling The Operator Panel

    9.6 DISASSEMBLING/ RE-ASSEMBLING THE OPERATOR PANEL: Remove the casing (section 9.4). Lift the panel using your fingers or a small screwdriver and unclip it from the printer. The button and LED assembly will be loose on the rear of the panel.

  • Page 93: Disassembling / Re-Assembling The Power Supply Board

    9.7 DISASSEMBLING / RE-ASSEMBLING THE POWER SUPPLY BOARD: Remove the casing (section 9.4). Release clasps (1), (2), (3), (4), (5), (6) and take out the board rack. Parts Replacement 9-9...
  • Page 94 Unplug the connector (7) from the mother board. To replace the board, remove screws (8) and (9). _______________________Note:_________________________ When replacing the fuse, make sure that the new one has the same characteristics. When replacing the mother board, check that the mains voltage supported is the same as that of the old board.

  • Page 95: Disassembling / Re-Assembling The Paper Feed Motor

    9.8 DISASSEMBLING / RE-ASSEMBLING THE PAPER FEED MOTOR Remove the power supply board (section 9.7) Unhook and take out the separator (1) Remove screws (2) and (3) and withdraw the paper feed motor (A) Free the motor cables from the cable clamp slots and unplug the connector from the mother board.

  • Page 96: Disassembling / Re-Assembling The Carriage Motor

    9.9 DISASSEMBLING / RE-ASSEMBLING THE CARRIAGE MOTOR Remove the mother board (section 9.5) Lift tab (A) and draw out the ground spring (1) Unclasp hook (2) that fastens the bottom, then remove the motor from its housing _______________________Note:_________________________ When re-assembling, make sure that the belt and belt tensioned are functioning correctly Parts Replacement 9-12...

  • Page 97: Disassembling / Re-Assembling The Black/Color Selection And Sheet Presence Photosensors

    9.10 DISASSEMBLING / RE-ASSEMBLING THE BLACK/COLOR SELECTION AND SHEET PRESENCE PHOTOSENSORS Remove the mother board (section 9.5). Release the sheet presence photosensor (1) from its position and take it out of the machine Release the black/color selection photosensor (2) from its position Draw the cables out from the cable clamp slots.

  • Page 98: Disassembling / Re-Assembling The Linear Encoder

    9.11 DISASSEMBLING / RE-ASSEMBLING THE LINEAR ENCODER Remove the mother board (section 9.5) Take out the tensioning leaf spring (1) and turning it 90 , free it from the linear encoder strip Free the encoder band from the fastening hook at the other end and carefully withdraw it from the reading slot on the print head.

  • Page 99: Disassembling / Re-Assembling The Print Carriage

    9.12 DISASSEMBLING / RE-ASSEMBLING THE PRINT CARRIAGE Remove the carriage motor (section 9.9) Remove the linear encoder (section 9.11) Withdraw the carriage upper guide shaft (1) Remove the flexible supporting brackets and withdraw the carriage lower guide shaft (2) Draw out the flat cables (3) from the guides on the paper outfeed group and remove the carriage from the machine _______________________Note:_________________________ After re-assembling, run a print test and, if necessary, adjust the...

  • Page 100: Disassembling / Re-Assembling The Paper Outfeed Group

    9.13 DISASSEMBLING / RE-ASSEMBLING THE PAPER OUTFEED GROUP Remove the casing (section 9.4) Withdraw the head flat cable from the guides on the paper outfeed group Free the ends of the ink tube Release the paper outfeed group from clasps (1), (2), (3), (4) and raise it. _______________________Note:_________________________ When re-assembling, take care to insert the tractor group correctly.

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Lj520Deccolorwriter 520icLj500

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