Oki Microline 186 Maintenance Manual
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Oki Microline 186 Maintenance Manual

Oki Microline 186 Maintenance Manual

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Oki Data CONFIDENTIAL
Microline 186
PRINTER
Maintenance Manual
040622A
1 / 78
42590001TH01 Rev.1

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Summary of Contents for Oki Microline 186

  • Page 1 Oki Data CONFIDENTIAL Microline 186 PRINTER Maintenance Manual 040622A 1 / 78 42590001TH01 Rev.1...
  • Page 2 Oki Data CONFIDENTIAL Document Revision History Corrected items Person in Rev.No. Date charge Page Description of change 2003-09-08 ISSUE(RSPL) T. Kitabatake 2003-12-24 ISSUE T. Kitabatake 42590001TH01 Rev.1...
  • Page 3 Oki Data CONFIDENTIAL PREFACE This maintenance manual describes how to maintain the Microline 186 printer in the field. This manual is for customer engineers. For further information, refer to the Users Manual for handling or operating the equipment. The relation between the destination point and the model name of this printer is as follows.
  • Page 4 Oki Data CONFIDENTIAL Contents 1. CONFIGURATION ....................6 Standard Printer Configuration .................... 6 Options ..........................7 2. THEORY OF OPERATION ..................8 Electrical Operation ......................8 2.1.1 General ........................8 2.1.2 Microprocessor and Its Peripheral Circuits ............. 9 2.1.3 Initialization ......................10 2.1.4...

  • Page 5: Table Of Contents

    Oki Data CONFIDENTIAL 4. ADJUSTMENT ....................45 Head-Gap Adjustment ....................... 45 Space Rack and Roller-Gap Adjustment ................47 5. CLEANING AND LUBRICATION ...............48 Cleaning ..........................48 Lubrication ......................... 48 6. TROUBLESHOOTING AND REPAIR ..............49 Items To Be Checked Before Repair ................. 49 Finding the Cause of Error ....................
  • Page 6 Oki Data CONFIDENTIAL CONFIGURATION Standard Printer Configuration The standard configuration of the Microline186 is as follows: Paper separator Cover assembly Power supply unit Ribbon cartridge Control board Oparation panel Print unit Figure 1-1. Printer Configuration 42590001TH01 Rev.1...
  • Page 7 Oki Data CONFIDENTIAL Options Tractor unit (consists of Pin tractor assy, acoustic cover, and access cover) Pin tractor assembly Acoustic cover Access cover Roll paper stand Super-speed RS232-C serial interface board 42590001TH01 Rev.1...
  • Page 8 Oki Data CONFIDENTIAL THEORY OF OPERATION Electrical Operation This section describes the operation of the printer circuits. 2.1.1 General The electrical section of the printer consists of the components shown in figure1. In addition to the microprocessor, the control board also contains a AC power circuit, drive circuits, a paper-end sensor, a parallel interface connector, and an USB interface connector.
  • Page 9 Oki Data CONFIDENTIAL 2.1.2 Microprocessor and Its Peripheral Circuits Microprocessor (Q1: 67X640) The microprocessor is the nucleus of the control circuit, and its peripheral circuits operate under control of this microprocessor. The I/O ports of the microprocessor are connected with the address bus, data bus, and control lines.
  • Page 10 Oki Data CONFIDENTIAL 2.1.3 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 by resetting Q1 (microprocessor) and Q3 (interface LSI).
  • Page 11 Oki Data CONFIDENTIAL 2.1.6 Spacing Drive Circuit Space motor control The motor control LSI (Q3:MSM0110-125) outputs the space motor phase signals (SPU, SPV, and SPW) in accordance with the spacing command from the microprocessor, At the same time, it outputs the overdrive signal (SPD-A).
  • Page 12 Oki Data CONFIDENTIAL 2.1.7 Line Feed Circuit The LSI Q3 sends LFPH-A and LFPH-B signals to the LF driver (LFDV). Upon receiving these signals, the LF driver (LFDV) rotates the motor by bipolar constant current drive. LFPH-A LFPH-B <FORWARD> <REVERSE>...
  • Page 13 Oki Data CONFIDENTIAL Mechanical Operation 2.2.1 The Printhead Mechanism and Its Operation (see figure 3) The print head is spring-loaded, utilizing a permanent magnet, and can be easily removed or installed. The print head is mounted on a carriage that runs parallel to the platen and is connected with the control circuit via the head board.
  • Page 14 Oki Data CONFIDENTIAL 2.2.2 Spacing Mechanism and Operation (see figure 4) The spacing operation is performed by driving the carriage frame, which is guided by carriage shaft mounted parallel to the platen, with the DC motor mounted on the bottom of the carriage frame.
  • Page 15 Oki Data CONFIDENTIAL 2.2.3 Head-Gap Adjusting Mechanism (see figure 5) The head-gap adjusting mechanism adjusts the gap between the platen and print head by changing the tilt angle of the carriage frame with the adjusting lever. When the adjusting lever is operated, the adjusting screw, which is interlocked with the lever via a gear, rotates to change the tilt angle of the carriage frame around the carriage shaft.
  • Page 16 Oki Data CONFIDENTIAL 2.2.4 Ribbon Feed Mechanism and Operation (See figure 6) The ribbon feed mechanism feeds the ribbon in synchronization with the spacing operation. The mechanism is driven by the space motor. The ribbon feed mechanism consists of: (a) Ribbon feed gear assembly...
  • Page 17 Oki Data CONFIDENTIAL 2.2.5 Paper Feed Mechanism and Operation Paper feed is performed by rotating the platen and pin tractors, which are driven by the LF pulse motor. The paper feed mechanism consists of: (a) Pulse motor with gear (b) Reduction gear...
  • Page 18 Oki Data CONFIDENTIAL Paper clamp mechanism (see figure 8) When the release lever is set to open, the release link moves backward, and the front and rear release links rotate counterclockwise. At the same time, the interlocked release shaft also rotates counterclockwise sot that a gap is made between the pressure rollers and platen, allowing insertion of paper.
  • Page 19 Oki Data CONFIDENTIAL 2.2.6 Paper -End Detection Mechanism (see figure 9) Rear paper feed When paper is present in the printer, the paper prevents the near-end lever from falling into the groove of the paper-chute, and the paper-end sensor is on.
  • Page 20 Oki Data CONFIDENTIAL ASSEMBLY/DISASSEMBLY Precaution for parts Replacement Be sure to remove the DC cord and interface cable before disassembly or reassembly: (a) Turn off the AC power switch, remove the AC input plug on the AC cord from the AC receptacle, then remove the AC cord from the inlet on the printer side.
  • Page 21 Oki Data CONFIDENTIAL Maintenance Tools The tools in table 3-1 are necessary for replacing printed-circuit boards and parts in the field. Different tools may be necessary for other maintenance procedure. Table 3-1 Maintenance Tools Tool Quantity Purpose Phillips screwdriver No.1-100 2- to 2.6-mm screws...
  • Page 22 Oki Data CONFIDENTIAL Disassembly/Reassembly of Procedure This section explains the assembly replacement procedures according to the following disas- sembly system. [Parts Layout] Figure 3-1 22 / 42590001TH01 Rev.1...
  • Page 23 Oki Data CONFIDENTIAL [How to Change Parts] This section explains how toe change parts and assemblies appearing in the disassembly diagram below. Printer unit 3.3.1 Print head 3.3.2 Upper cover 3.3.3 Control board 3.3.4 Power supply unit 3.3.5 Operation board 3.3.6...
  • Page 24 Oki Data CONFIDENTIAL 3.3.1 Print Head Turn OFF the DC POWER switch, and remove DC cable 1 from the outlet. Caution: Print head may be hot after printing. Remove access cover 2 by lifting the rear edge of the cover.
  • Page 25 Oki Data CONFIDENTIAL 3.3.2 Upper Cover Turn OFF the DC POWER switch, remove DC cable 1 from the outlet, remove interface cable 2, and remove paper. Remove the acoustic cover and paper separator (if installed). Remove the pin tractor assembly 3 by depressing the lock lever 4 and tilting it backward (if installed).
  • Page 26 Oki Data CONFIDENTIAL 26 / 42590001TH01 Rev.1...
  • Page 27 Oki Data CONFIDENTIAL 3.3.3 Control Board Remove the upper cover (see 3.3.2). Remove the serial interface board if installed by removing the two screws located on both sides of the interface connector. Remove the interface board by lifting it (if installed).
  • Page 28 Oki Data CONFIDENTIAL 3.3.4 Power supply unit Remove the upper cover (see 3.3.2). Remove power supply connector 1 from the control board. Remove two screws 2 and remove screw 3. Remove power supply unit 4 together with cord receptacle 5 by lifting.
  • Page 29 Oki Data CONFIDENTIAL 3.3.5 Operation Board Remove the upper cover (see 3.3.2). Disengage both ends A and remove the operation panel 1 by sliding upward. Unplug the operation panel cable 2 from the connector 3 (in the direction of the arrow B).
  • Page 30 Oki Data CONFIDENTIAL 3.3.6 Ribbon-feed Gear Assembly Remove the upper cover (see 3.3.2). Remove the print head (see 3.3.1). Disengage the two front tabs 1 and two rear tabs 2. Then lift by inserting small flat screwdriver in the slot.
  • Page 31 Oki Data CONFIDENTIAL 3.3.7 Space Motor Assembly Remove the upper cover (see 3.3.2). Remove the print head (see 3.3.1). Remove the ribbon feed gear assembly (see 3.3.6). Remove connector 1 while checking the concave surface. Remove three screws 2. Remove space motor assembly 3.
  • Page 32 Oki Data CONFIDENTIAL 3.3.8 Printer Mechanism Remove the upper cover (see 3.3.2). Remove the print head (see 3.3.1). Remove the control board (see 3.3.3). Remove the power supply (see 3.3.4). Remove the ribbon-feed gear assembly (see 3.3.6). Remove the space motor assembly (see 3.3.7).
  • Page 33 Oki Data CONFIDENTIAL 3.3.9 LF Motor Assembly Remove the printer mechanism (see 3.3.8) Remove two screws 1. Remove LF motor assembly 2. For reassembly, reverse the disassembly procedure. Notes: 1. When assembling, match the teeth of platen gear 3 and bias gear 4 , then engage the gear at D .
  • Page 34 Oki Data CONFIDENTIAL 3.3.10 Space Rack Remove the upper cover (see 3.3.2). Remove the print head (see 3.3.1). Remove the ribbon feed gear assembly (see 3.3.6) Remove the space motor assembly (see 3.3.7). Remove spring 1. Disengage tab 2. Remove the space rack by inserting a flat screwdriver between space rack 3 and base frame 4 and gently lifting the space rack.
  • Page 35 Oki Data CONFIDENTIAL 3.3.11 Cable assembly Remove the printer mechanism (see 3.3.8). Detach the cable assembly 1 from the lower cover 2. Notes: 1. When bonding the cable assembly, place it along the inner surface of the rib of the lower cover (figure A).
  • Page 36 Oki Data CONFIDENTIAL 3.3.12 Carriage Frame Remove the upper cover (see 3.3.2) Remove the printer mechanism. (See 3.3.8) Remove the column indicator bar (see 3.3.13). Remove two screws on both sides 1. Remove the carriage shaft 2 together with carriage frame 3.
  • Page 37 Oki Data CONFIDENTIAL 3.3.13 Column Indicator Bar Remove the upper cover (see 3.3.2) Remove two springs 1. Remove two push shafts 2 by squeezing the pins A in the direction of the arrow. Remove column indicator bar 3. For reassembly, reverse the disassembly procedure.
  • Page 38 Oki Data CONFIDENTIAL 3.3.14 Platen Assembly Remove the upper cover (see 3.3.2). Disengage four tabs 1 by gently pushing tabs from side plate B on each side. Remove platen assembly 2. For reassembly, reverse the disassembly procedure. Notes: 1. When assembling, match the teeth of platen gear 3 and bias gear 4 , then engage the gear at A .
  • Page 39 Oki Data CONFIDENTIAL 3.3.15 Paper-chute Assembly Remove the upper cover (see 3.3.2). Remove the printer mechanism. (See 3.3.8) Remove the LF motor assembly (see 3.3.9). Remove the platen assembly (see 3.3.14). Open two tabs 1 with a flat screwdriver, then remove paper lock release lever 2. (Be careful with the tabs because they are very small.)
  • Page 40 Oki Data CONFIDENTIAL 3.3.16 Bottom Paper Guide Assembly Remove the upper cover (see 3.3.2). Remove the printer mechanism. (See 3.3.8) Remove the LF motor assembly (see 3.3.9). Remove the platen assembly (see 3.3.14) Remove the paper-chute assembly (see 3.3.15). Remove screw 1, then remove near-end lever assembly 2.
  • Page 41 Oki Data CONFIDENTIAL 3.3.17 Near-end Lever and Bracket Remove the upper cover (see 3.3.2). Remove the printer mechanism. (See 3.3.8) Remove the LF motor assembly (see 3.3.9). Remove the platen assembly (see 3.3.14). Remove the paper-chute assembly (see 3.3.15). Remove near-end lever 1.
  • Page 42 Oki Data CONFIDENTIAL 3.3.18 Bottom Near-end Lever Remove the upper cover (see 3.3.2). Remove the printer mechanism. (See 3.3.8) Remove the LF motor assembly (see 3.3.9). Remove the platen assembly (see 3.3.14). Remove the paper-chute assembly (see 3.3.15). Remove bottom near-end lever 1.
  • Page 43 Oki Data CONFIDENTIAL 3.3.19 Switch assembly Remove the upper cover (see 3.3.2). Remove the printer mechanism. (See 3.3.8) Remove the screw 1. Detach the switch assembly 2. For reassembly, reverse the disassembly procedure. Notes: 1. The switch assembly should be detached or reattached with the bail lever placed in its closed position (backward).
  • Page 44 Oki Data CONFIDENTIAL 3.3.20 Pin Tractor Assemblies (R and L) Remove the sheet guide 1. Remove screw 2. Remove side frame 3. Unlock lock lever 4, and remove left 6 and right 5 pin tractor assemblies. For reassembly, reverse the disassembly procedure.

  • Page 45: Adjustment

    Oki Data CONFIDENTIAL ADJUSTMENT Head-Gap Adjustment Tools: • Thickness gauge set • Phillip’s screwdriver No. 2-200 • Metal rod about 0.04 inch (1 mm) in diameter and 3 inches (76 mm) long (an extended paper clip can be used) Adjustment procedure (see figure 4-1) (1) Turn OFF the AC POWER switch and remove the AC plug from the AC receptacle.
  • Page 46 Oki Data CONFIDENTIAL Platen Left Right Print head Adjusting screw Idle gear Adjusting gear 0.0165~0.019’’ (0.42~0.48 mm) Print head Adjusting screw Platen Figure 4-1 Head-Gap Adjustment 46 / 42590001TH01 Rev.1...

  • Page 47: Space Rack And Roller-Gap Adjustment

    Oki Data CONFIDENTIAL Space Rack and Roller-Gap Adjustment Tools: • Thickness gauge • Phillip’s screwdriver No. 2-200 • Tension guage, 250 g Adjustment procedure (1) Turn OFF the AC POWER switch and remove the AC plug from the AC receptacle.

  • Page 48: Cleaning And Lubrication

    Oki Data CONFIDENTIAL CLEANING AND LUBRICATION Cleaning Cautions: 1. Be sure to turn OFF the DC POWER switch before cleaning. 2. Be careful not to let paper lint get inside the mechanism. The printer should be cleaned periodically as follows: Period: Either 6 months or 300 operating hours, whichever comes first.

  • Page 49: Troubleshooting And Repair

    Oki Data CONFIDENTIAL TROUBLESHOOTING AND REPAIR Items To Be Checked Before Repair When there is a user request for repair, check whether the printer can be fixed by the trou- bleshooting procedure described in the User’s Manual. If possible, ask the user about the conditions that caused the error and make a record of the answer.
  • Page 50 Oki Data CONFIDENTIAL 50 / 42590001TH01 Rev.1...
  • Page 51 Oki Data CONFIDENTIAL Table 6-2 Pin Numbers and signal Names Connection Coil Figure Name Signal Name Resistance A(CN7) B(CN8) C(CN9) D(CN2) G(CN1) A18,B18 A8,B8 A19,B19 A7,B7 Approx. A20,B20 A6,B6 MOTOR 21Ω PHASEA A24,B24 A2,B2 PHASEB A23,B23 A3,B3 HEAD1 A17,B17 A9,B9...
  • Page 52 Oki Data CONFIDENTIAL • REO-Printed-Circuit Board AC10V DC40V DC8V +40V • LAB-Printed-Circuit Board SW1...LINE FEED SW3...TOF SET SW5...PITCH SW2...FORM FEED SW4...SELECT SW6...MODE LED4 LED7 LED5 LED8 LED6 LED9 LED1 LED2 LED3 LED1...SELECT LED4...10 LED7...NLQ LED2...ALARM LED5...12 LED8...UTILITY LED3...POWER LED6...17 LED9...HSD...

  • Page 53: Troubleshooting

    Oki Data CONFIDENTIAL Troubleshooting Power is on, but carriage does not move. • Is POWER LED (LED3) lit? • to step 2 • Is AC power supplied to AC power supply unit? (AC transformer) • Replace the AC cable assembly.
  • Page 54 Oki Data CONFIDENTIAL The Power LED lights when power is turned on, but the carriage does not move. • Are the ALARM LED (LED2) and SELECT LED (LED1) lit? • Replace the REO board. • Is the carriage easily moved by hand when the power is turned off? 2-a •...
  • Page 55 Oki Data CONFIDENTIAL • Is the head cable fitted to CN8 securely? • Re-fit the head cable. • Is the head cable fitted to the connector of the SP motor? • Re-fit the head cable. • Is carriage cable broken? •...
  • Page 56 Oki Data CONFIDENTIAL Carriage movement is abnormal (runaway, vibration, incomplete homing) when the power is turned on. • Runaway? • Replace the REO board. • Vibration • Is +40 V output? • Replace the REO board or the AC transformer.
  • Page 57 Oki Data CONFIDENTIAL Homing operation is normal, but the indicators (LED1 to LED9) are abnormal when power is turned on. • Is POWER LED (LED3) lit? • Is +5 V applied to the anode of POWER LED? • Correct connection at A and G .
  • Page 58 Oki Data CONFIDENTIAL Fuse F1 on AC power supply unit (AC Transformer) blows when power is turned on. • Is the fuse properly rated? • Replace the fuse with properly rated fuse. • Remove connector CN4 and turn on the power.
  • Page 59 Oki Data CONFIDENTIAL Neither spacing nor printing performed while receiving data (parallel interface). • Verify that data is being sent to the printer. • Is SELECT LED (LED1) lit? • to step 4-1 • Are the signal levels at CN1 as shown in the table below with the interface cable removed?
  • Page 60 Oki Data CONFIDENTIAL Spacing is normal, but nothing is printed while receiving data. • Replace the print head. • Is printer operation normal? 8-a • Turn off the power, remove the REO board, and check the resistance between pins A6, B6, A7, B7,A8, B8, A9, B9, A10, B10 and A2, B2, A3, B3,A4, B4, A5, B5, A13, B13, A14, B14, A15, B15, A16, B16, A17, B17 at CN8 (connection board side) of connection A .
  • Page 61 Oki Data CONFIDENTIAL Printing stops due to an ALARM while receiving data and printing. • Is the ALARM lamp (LED2) lit? • Wait until the print head cools. • Is the SELECT LED flickering? • Paper near end. Refill paper.
  • Page 62 Oki Data CONFIDENTIAL Some dots are missing. • Remove the print head. • Is any pin broken? • Replace the print head. • Check the resistance of print head coil at connection F . (See table 6-2.) • Is the resistance approximately 20 ohms? •...
  • Page 63 Oki Data CONFIDENTIAL Line feed is not performed • Is paper installed correctly? • Install paper correctly. (When single sheet is used the friction lever must be set to closed position.) • Is the platen unusually hard to turn manually with the power off? •...
  • Page 64 Oki Data CONFIDENTIAL Fuse F1 on power supply unit blows while receiving data and printing. • Is the fuse properly rated? • Replace with properly rated fuse. • Turn off the power and check the print head coil, SP motor, and LF motor resistance.
  • Page 65 Oki Data CONFIDENTIAL Neither spacing nor printing performed while receiving data (USB interface). • Verify that data is being sent to the printer. • Is SELECT LED (LED1) lit? • to step 4-1 • Are the signal levels at CN6 as shown in the table below with the interface cable connected.

  • Page 66: Appendix A Pcb Layout

    Oki Data CONFIDENTIAL APPENDIX A PCB LAYOUT - PCB List - Circuit board, REO (Main Controller) Circuit board, LAB (Operator Panel) Circuit board, SLHI (Option) 66 / 42590001TH01 Rev.1...
  • Page 67 Oki Data CONFIDENTIAL • REO-Printed-Circuit Board • LAB-Printed-Circuit Board LED4 LED7 LED5 LED8 LED6 LED9 LED1 LED2 LED3 67 / 42590001TH01 Rev.1...
  • Page 68 Oki Data CONFIDENTIAL • SLHI-Printed-Circuit Board 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 68 / 42590001TH01 Rev.1...

  • Page 69: Appendix B Circuit Symbols

    Oki Data CONFIDENTIAL APPENDIX B CIRCUIT SYMBOLS Table8-1 shows the symbols used in the circuit diagrams. Table 8-1 Table of Symbols Symbol Mark Description SN74LS05 inverter (open collector) SN7406 inverter (open collector) Ceramic oscillator Transistor Thyristor Diode Zener diode Light-emitting diode...
  • Page 70 Oki Data CONFIDENTIAL Symbol Mark Description Frame ground Dot head (element) Coil 339 Comparator THERMISTOR Thermistor Signal ground Transformer Photo sensor Fuse 70 / 42590001TH01 Rev.1...

  • Page 71: Appendix C Spare Parts List

    Oki Data CONFIDENTIAL APPENDIX C SPARE PARTS LIST Printer Unit ....................... Figure 9-1 Printer Mechanism ....................Figure 9-2 Pin Tractor Unit ......................Figure 9-3 REO-Printed-Circuit Board ..................Figure 9-4 71 / 42590001TH01 Rev.1...
  • Page 72 Oki Data CONFIDENTIAL Figure 9-1 Printer Unit 72 / 42590001TH01 Rev.1...
  • Page 73 Oki Data CONFIDENTIAL Table 9-1 Print Unit Q’ty of Spare Parts / Year Parts Number Description Q’ty Remarks Unit : 500 42014601 Upper Cover (Calked) 3.5Y8/0.5 42014602 Upper Cover (Calked) 0.7P2.3/1.0 42014801 Dip Switch (Access) Cover 3.5Y8/0.5 42014802 Dip Switch (Access) Cover 0.7P2.3/1.0...
  • Page 74 Oki Data CONFIDENTIAL Figure 9-2 Printer Mechanism 74 / 42590001TH01 Rev.1...
  • Page 75 Oki Data CONFIDENTIAL Table 9-2 Printer Mechanism (1/2) Q’ty of Spare Parts / Year Parts Number Description Q’ty Remarks Unit : 500 42612501 Base Frame 41766301 Platen Assy 50039105 Paper Chute Assy 41996701 Bottom Paper Guide Assy 41858101 Near-End Bracket...
  • Page 76 Oki Data CONFIDENTIAL Table 9-2 Printer Mechanism (2/2) Q’ty of Spare Parts / Year Parts Number Description Q’ty Remarks Unit : 500 53447401 Space Rack 42559201 Film - Head Cable 42598301 Bail Sensor Assy For ML280Elite /ML184Turbo+ 42594001 Lower Cover Assy 3.5Y8/0.5...
  • Page 77 Oki Data CONFIDENTIAL Q’ty of Spare Parts / Year Parts Number Description Q’ty Remarks Unit : 500 3PB4025-2667P001 PIN TRACTOR(R) ASSY 3PB4025-2668P001 PIN TRACTOR(L) ASSY Figure 9-3 Pin Tractor Unit 77 / 42590001TH01 Rev.1...
  • Page 78 Oki Data CONFIDENTIAL ODA Parts Parts Number Description Q’ty Remarks 540A2208S1302 Fuse 3 A Figure 9-4 REO-Printed-Circuit Board 78 / 78 42590001TH01 Rev.1...

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