Oki MICROLINE 390 Maintenance Manual
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Oki MICROLINE 390 Maintenance Manual

Oki MICROLINE 390 Maintenance Manual

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MA NTENANCE
MANUAL

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Summary of Contents for Oki MICROLINE 390

  • Page 1 MA NTENANCE MANUAL...
  • Page 2 PREFACE This maintenance manual describes field maintenance of the Microline 390/391 Elite printer and options for maintenance personnel. For performance specifications and operating procedures, refer to the “User’s Manual”.

  • Page 3: Table Of Contents

    TABLE OF CONTENTS CONFIGURATION _. _. __________________ _. _.__. ._. .____. _. __.. ._._ Standard Printer Configuration Options ...._____.___________________.__...______._ 1-2 Specifications ........__.._._._ 1-4 1.3.1 Printspecifications .
  • Page 4 Line feed circuit ............3.1.7 3.1.8 Alarmcircuits .
  • Page 5 4.3.16 Carriageframe __ 4.3.17 Spacerack .._.._.._____.______..._________.._.._____..__.._.__..__ 4-25 4.3.18 Guiderail ________.._..__.__.____.________..._.._..__.___.___________.. 4-26 4.3.19 Head cable 4-28 4.3.20 Platen assembly 4.3.21 Ribbon protector _. 4.3.22 LFmotor .............1. 4-31 4-32 4.3.23 LF motor interconnect module 4.3.24 Idlergear ____..__..__._.______..________________________________.___._._...
  • Page 6 n E-2 Operation at poweron 2.2.1 2.2.2 E - 4 Communication Procedure Flowchart 2.3.1 M o d e @ __________..________________________.___.,,,..._..___..__________ E - 5 2 . 3 . 2 Mode@ TROUBLESHOOTING FLOWCHART Before Repairing a Fault T r o u b l e s h o o t i n g _..______________...___.._____________._.._____________ E - 1 1 E-l 1 3.3.1...

  • Page 7: Configuration

    1. CONFIGURATION...

  • Page 8: Standard Printer Configuration

    1. CONFIGURATION 1.1 Standard Printer Configuration The standard configuration of the ML390/391 Elite is as follows Paperseparator Platen knob Ribbon cassette Figure l-l Printer configuration l - l...

  • Page 9: Options

    1.2 Options (1) Tractorfeed unit with acoustic cover Cut-sheet feeder unit with access cover...
  • Page 10 Super-speed RS-232C serial interface board Font memory card...

  • Page 11: Specifications

    1.3 Specifications 1.3.1 Print specifications Print method Impact dot matrix Number of dot wires : 0.0079 inch (0.2 mm) Dot wire diameter Bidirectional, short-line-seeking printing Print direction Unidirectional printing specifiable Print speed Character pitch Print mode 17.1 CPI 20 CPI Utility 225.0 CPS 270.0 CPS...

  • Page 12: Paperspecifications

    1.3.2 Paper specifications Cut-sheet paper The standard size : 8-l/2 inches (wide) x 11 inches (long) for the U.S. A4 size Weight : 12 to 24 lb (45 to 90 g/mz) Multiple-part paper cannot be used. Sprocket paper The tractor feed unit can handle sprocket paper of the following widths: ML390 Elite: 3 to 10 inches (76.2 to 254 mm) ML391 Elite: 3 to 16 inches (76.2 to 406.4 mm) One-part paper...

  • Page 13: Physical Specifications

    (5) Card 100 Ibs (162.8 g/m2) or less Weight Thickness Size Medium feed : Bottom paper feed only (6) Label : 0.011 inch (0.28 mm) or less Thickness Size ML391 Elite- 15x3.25 inches(381 x 83 mm) or less OHP sheet (transparencies) Thickness Size Physical specifications...

  • Page 14: Environmental Conditions

    1.3.5 Environmental conditions Ambient temperature and relative humidity Operating Non-operating Unit Storage Temperature 41 to 104 14to 109.4 -40 to 158 (5 to 40) (-40 to 70) Relative Humidity 20 to 90 The printer must be packed during storage Avoid condensation at all times. (2) Vibration Operating Non-operating :...

  • Page 15: Installation Procedure

    2. INSTALLATION PROCEDURE...

  • Page 16: Unpacking

    2. INSTALLATION PROCEDURE 2.1 Unpacking Unpacking the packing box Unpackthepackingbox. (2) Takeouttheprinterunit. Takeouttheaccessories. Packing box...

  • Page 17: Unpackingtheprinterunit

    2.1.2 Unpacking the printer unit Removethe printer unit from the polyethylene bag. Polyethylene bag Printer unit...

  • Page 18: Unpackingtheaccessories

    Remove the C cable, fuses, paper separator, platen knob, ground screw, and ribbon cassette from the polyethylene bag. Paperseparator Polyethylene bag Ribbon cassette Platen kno6...

  • Page 19: Installation

    2.2 Installation (Refer to the User’s Manual for Details.) 2.2.1 Precaution for installation Pay attention to the following when installing the printer: Any place exposed to direct sunlight. Any place with great fluctuations in temperature. Any place exposed to outdoor wind. A dusty place Near a door Near an air-conditioner.
  • Page 20 3) Printer rear space requirement Match the rear part of the printer with the edge of a desk. Leave a space of more than 24 inches (60 cm) at the rear of the printer to allow sufficient space for paper. 4) To prevent incoming and outgoing forms from interfering with each other, place the forms within 4to 6 inches (10 to 15 cm) from the edge of a desk.

  • Page 21: Removing The Shipping Retainer

    2.2.2 Removing the shipping retainer Remove the shipping retainer which secures the printhead from movement during shipping by opening the access cover. Shipping retainer...

  • Page 22: Installing The Accessories

    2.2.3 Installing the accessories Install the sheet separator. Install platen knob. Install the ribbon cassette. , Sheet separator knob Ribbon cassette...

  • Page 23: Connectingcables

    2.2.4 Connecting cables Connect the interface cable, Connect the AC cable. Make sure that the AC power switch on the right side of the printer is set to OFF side (the side marked with Interface cable To the host computer...

  • Page 24: Installingpaper

    Install...

  • Page 25: Poweringon

    2.2.6 Powering on Push the AC “POWER” switch on the right side of the printerto “ON” (the side marked with I) Confirm that the “POWER” lamp goes on and the printhead returns to its home position. 2-10...

  • Page 26: Rolling Ascii Test Pattern

    2.2.7 Rolling ASCII test pattern Confirm thatthe “POWER” switch is OFF and while pressing the “TOF/QUIET” switch, press the “POWER” switch to “ON”. The rolling ASCII pattern as shown below will be printed. To finish the test, press the “MODE” switch. The “SEL”...

  • Page 27: Theory Of Operation

    3. THEORY OF OPERATION...

  • Page 28: Electrical Operation

    3. THEORY OF OPERATION 3.1 Electrical Operation This secti,on de~scribes the electrical operation of the printer circuits. 3.1.1 General The block diagram of the printer circuit is shown in Figure 3-1. The control board consists of the microprocessor and its peripheral circuits, the drive circuits, paper end sensor and interface connector.
  • Page 29 (4) LSI (MSM6990) (911) The MSM6990 is an external interface and motor control LSI. It has the following functions: A: External interface controller (a) Parallel interface function The parallel interface function mode is selected when the level of the mode selection signal (ISEL) is high.
  • Page 30 (6) EEPROM (Q9) This 256-bit serial data electrically erasable and programmable ROM stores the menu mode data. LSI (MSM79H097) (46) The MSM79H097 controls the DMA, head drive and LF microstep. The details are described below. (a) DMA control Data transfers from ROM to D-RAM or between D-RAMS is performed by DMA transfer eliminating the need of the CPU to perform such operations.
  • Page 31 MSM6990 \ PROM PAPER END SENSOR 128 kbyte 0 ~_________. CIRCUIT POSITION I ADDRESS BUS (for ADDRESSANDDATABUS D-RAM OPTIONAL INTERFACE RAM ADDRESS 48 kbyte LF MOTOR HEAD DRIVE CONTROL PRINTHEAD (WITH BUILT-IN TEMPE- 512 kbyte RATURESENSOR) POWERSUPPLY CIRCUIT (OPTION) Figure 3-1 Block diagram...

  • Page 32: Initialization

    3.1.3 Initialization The printer is initialized when the power is turned on or when the parallel interface signal, I-PRIME, is received from the host computer. Initialization is started when the RST OUT 1 signal is sent from the reset circuit (47 pin 1) to 911, and RST OUT-P is sent from Ql 1 to 98 and Q6.

  • Page 33: Printhead Drive Circuit

    3.1.5 Printhead drive circuit This circuits is used to drive the head magnets corresponding to HEAD DATA 1 to 24 (the head pins) by the HD DV signal (even or odd trigger) for printing purposes. When-the HD DV signal is at “L” level, the head driving time is determined by the HD DV pulse width.

  • Page 34: Spacing Drive Circuit

    3.1.6 Spacing drive circuit Spacing motor control The motor control LSI (Qll: MSM6990) outputs the spacing motor phase signals (SP-U, SP-V, and SP-W) in accordance with the spacing command from the microprocessor, and at the same time outputs the overdrive signal (SPD-A). The SPD-A signal is a fixed-period pulse signal.
  • Page 35 Encoder disk In the operation of the spacing motor, the PHASE-A and PHASE-B signals are generated. When the encoder disk interrupts the photo sensor. The motor control LSI (911: MSM6990) divides these edge pulse signals in accordance with the print pitch, and sends the IPT signal to provide dot-on timmg and carriage position detection timing.

  • Page 36: Line Feed Circuit

    The line feed motor shaft is held stationary by the LF HOLD signal (holding current: approx. 25 mA) while it is at a stopped position. During line feed operation, the line feed motor is driven by a large current supplied in accordance with LF OVD signal.

  • Page 37: Paper End Detection Circuit

    Printhead overheat alarm circuit In order to protect the printhead coils, this circuit monitors the printhead temperature by using the thermistor which is built into the printhead. If heavy-duty printing is performed continuously for a long time, the printhead temperature increases.

  • Page 38: Power Supply Board

    3.1 .I 0 Power supply The power supply consists of a power transformer, filter board, and DC power supply board. The input AC voltage is transformed into 8.6 VAC, 46 VAC, and 10 VAC by the power transformer. These AC voltages are rectified to + 8 VDC, + 5 VDC, and + 40 VDC levels by the DC power supply board and supplied to the control board.

  • Page 39: Mechanical Operation

    3.2 Mechanical Operation 3.2.1 The printhead mechanism and its operation (See Figure 3.3.) The printhead is a spring charged type 24-pin driving head utilizing a permanent magnet. It is attached to the carriage and moves parallel with the platen. Figure 3-2 Arrangement of the head pins (View from the tip of the printhead) The printhead is composed of the following parts:...
  • Page 40 (1) When printing Armature assembly Thermistor Printwire Magnet (2) When not printing Figure 3-3 3-13...

  • Page 41: Spacing

    3.2.2 Spacing (See Figure 3.4.) The spacing mechanism consists of a carriage shaft which is mounted parallel with the platen, and a carriage frame which slides over the shaft. A DC motor which is mounted on the bottom surface of the carriage frame is used to move the carriage frame.
  • Page 42 (1) Spacing operation The carriage frame, which is connected to the,printhead and space motor, slides over the carriage shaft in parallel with the platen. When the space motor rotates in counter-clockwise direction the motor gear rotates against the space rack, moving the carriage from left to right. For every revolution of the DC motor, the carriage frame moves 0.8 of an inch (20.32 mm).

  • Page 43: Head Gap Adjusting

    3.2.3 Head gap adjusting (See Figure 3-5.) The head gap adjusting lever moves back and forth to tilt the carriage frame, altering the gap between the printhead and the platen. The adjusting screw, which is connected to the adjusting gear rotates,when the adjusting lever is moved creating a fine gap adjustment.
  • Page 44 Adjusting gear Range from 0 to Ca Narrows Printhead e Adjusting screw Widens Range from 0 to @ Figure 3-5 3-17...

  • Page 45: Ribbon Drive

    3.2.4 Ribbon drive (See Figure 3-6.) The ribbon driver mechanism moves the ribbon in synchronization with the space motor operation. The ribbon drive mechanism consists of the following items: Ribbon drive gear assembly Ribbon gear (space motor) (1) Ribbon cartridge An endless ribbon with a single direction feed is used.
  • Page 46 Ribbon cartridge Ribbon drive gear assembly Figure 3-6 3-19...

  • Page 47: Paperfeed

    3.2.5 Paper feed Paper feeding is performed by turning the platen and the pin tractor, which is driven by the LF pulse motor. The paper feed mechanism consists of the following items: Pulse motor with gears Decelerating gear Platen Tractor feed unit Pressure roller Cut-sheet feed operation (See Figure 3-7.) The pulse motor used for the paper feed mechanism is mounted on the left side of the printer...
  • Page 48 Continuous paper feed operation (See Figure 3-8.) The force transmitted to the platen, as explained in Paragraph (1) for cut sheet feed operation, rotates tractor gear B through platen gear A, the idler gear and the change gear. The rotation of tractor gear 8 makes the pin tractor belt rotate through a sheet feeder’shaft, feeding the continuous paper.
  • Page 49 Cut-sheet and continuous sheet switchin.g mechanism (See Figure 3-9.) The selection of cut-sheet and continuous sheet is done by using the release lever on the right side of the printer mechanism. When the release lever is pushed back, the change gear is moved outward in the direction of the arrow.
  • Page 50 Pull tractor mechanism (option) (See Figure 3-10.) Bottom feed of continuous sheets is possible only when an optional tractor unit is installed. Continuous form Sheet feeder shaft Figure 3-10 The rotation of the platen is transmitted to the idler gear of the pull tractor unit through the platen gear at the left end of the platen.
  • Page 51 Push and pull tractor mechanism (option) (See Figure 3-11.) This mechanism consists of an optional pull tractor and a standard push tractor mechanism. This mechanism can perform forward and reverse feed by setting continuous sheets to the push tractor and pull tractor. The rotation of the platen is transmitted to the push tractor and the pull tractor.
  • Page 52 Paper clamp mechanism (See Figure 3-12.) When the release lever is pushed to the open position, the release link rotates in a counter-clockwise direction. The release shaft, which is engaged with this, rotates in a counter-clockwise direction at the same time. A clearance is created between the pressure roller and the platen through which sheets can be inserted.
  • Page 53 Conversely, if the release lever is pushed in a closed position, the release link rotates in a clockwise direction. The release shaft, which is engaged with this, rotates clockwise at the same time. The pressure roller is pressed against the platen by the pressure spring which is welded to the release shaft, thus feeding is enabled.

  • Page 54: Paper End Detection

    3.2.6 Paper end detection (See Figure 3-13.) Paper end for rear feed paper When a sheet is inserted, tip A of the paper end lever B is prevented, by the paper, from falling into the slot of the paper chute. The sensor lever is pushed up by pressure @, and the paper end sensor is turned on.

  • Page 55: Bailarm

    3.2.7 Semi-automatic sheet feeder (SASF) (See Figure 3-14.) This function sets the print start position of the paper automatically when using cut-sheet and continuous sheet paper. The procedural operation is as follows: When using a cut-sheet (SASF) Set the release lever to the cut-sheet side (rear side). Insert paper from behind the platen.

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Microline 391 elite

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