OKIDATA ML1120 Maintenance Manual
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OKIDATA ML1120 Maintenance Manual

Oki data impact printer maintenance manual
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No.01
Related drawings
Drawing No.
43471801TL
43471801TR
43516901TM
BOM
Use for
Rev
Date
DCO No.
1
2004-05-21
HP9-0009
Approval
Yoshifumi Igari
.....................................................................................................
Check
Yoshifumi Igari
.....................................................................................................
Date
2006-10-10
ML1120 PRINTER

Maintenance Manual

[Rev. 1]
ML1120 Disassembly for Maintenance
ML1120 RSPL
ML1190 Troubleshooting Manual
Contents
Change format
Design
Yoshifumi Igari
Oki Data CONFIDENTIAL
Name
Certification Body
Design
Tomoyo Sugiyama
Name
ML1120
Maintenance Manual
Drawing No.
43471801TH
Approval
Akio Kikuchi
1
83

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Summary of Contents for OKIDATA ML1120

  • Page 1: Maintenance Manual

    Oki Data CONFIDENTIAL No.01 ML1120 PRINTER Maintenance Manual [Rev. 1] Related drawings Drawing No. Name 43471801TL ML1120 Disassembly for Maintenance 43471801TR ML1120 RSPL 43516901TM ML1190 Troubleshooting Manual Use for Certification Body Date DCO No. Contents Design Approval 2004-05-21 HP9-0009 Change format...
  • Page 2 Oki Data CONFIDENTIAL Document Revision History Corrected items Person in Rev.No. Date charge Page Description of change 2006-10-10 ISSUE ODS Y. Igari 43471801TH Rev.1...
  • Page 3 Oki Data CONFIDENTIAL PREFACE This maintenance manual describes how to maintain the ML1120 printer in the field. This manual is for customer engineers. For further information, refer to the Users Manual for handling or operating the equipment. 43471801TH Rev.1...

  • Page 4: Table Of Contents

    Oki Data CONFIDENTIAL Contents 1. CONFIGURATION ....................6 Standard Printer Configuration .................... 6 2. OPERATION ......................7 Summary ..........................7 Circuit Operation (See Figure 1) ..................8 2.2.1 CPU and peripheral circuits ..................8 2.2.2 Initializing operation ....................10 2.2.3 Controlling the interface ..................10 2.2.4 Print head control drive circuit ................
  • Page 5 Oki Data CONFIDENTIAL 4. ADJUSTMENT ....................51 4.1Gap between platen and print head ..................52 4.2Paper top positioning distance check ..................53 4.3Correcting cut-sheet 40-line feed height ................. 55 4.4Correcting both-direction print registration ................56 4.5Paper cut position check ......................57 5.

  • Page 6: Configuration

    Oki Data CONFIDENTIAL CONFIGURATION Standard Printer Configuration The standard configuration of the ML1120 is as follows: Access cover assy Sheet guide assy Platen Knob Upper cover Operation panel assy Pull-up roller assy Ribbon cartridge Print unit Power Supply board Control board...

  • Page 7: Operation

    Oki Data CONFIDENTIAL OPERATION Summary The main configuration of this printer is the print mechanism unit and print control unit. The print mechanism unit can be divided broadly into the print head, space system, paper-feed system, and ribbon-feed system. The operation of each item is listed below. (1) Print head ......

  • Page 8: Circuit Operation (See Figure 1)

    Oki Data CONFIDENTIAL Circuit Operation (See Figure 1) The circuit of this printer consists of the control board and carriage board. Circuits such as µCPU and its peripheral circuits, drive circuits, and the external interface circuit are set on the control board. The switches and LED are set on the control board.
  • Page 9 Oki Data CONFIDENTIAL Figure 1 43471801TH Rev.1...

  • Page 10: Initializing Operation

    Oki Data CONFIDENTIAL 2.2.2 Initializing operation The initializing operation is performed for this printer when the power is turned ON and when I-PRIME for the parallel interface is input from the Host. In the initializing operation, the RST-N signal is first output from the reset IC (RST-1 pin) to reset CPU. The program start after CPU is reset.

  • Page 11: Spacing

    Oki Data CONFIDENTIAL 2.2.5 Spacing The LSI (MG74Q514-131) outputs space motor phase signals (SP_PHA,SP_PHB) when it receives a spacing command from µCPU. It outputs IPT signals as the dot timing and carriage position detection timing in sync with these phase signals. The space motor phase signals (SP_PHA,SP_PHB) are input to the motor driver, which drives the space motor.

  • Page 12: Mechanical Operation

    Oki Data CONFIDENTIAL Mechanical Operation 2.3.1 The Printhead Mechanism and Its Operation (see figure 2) 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 13: Mechanism And Operation Of Space (See Figure 3)

    Oki Data CONFIDENTIAL 2.3.2 Mechanism and operation of space (see figure 3) The space mechanism of printers consists of several parts, including a carriage shaft placed parallel to a platen and a carriage frame that moves along the carriage shaft. The space mechanism is driven by a space motor located behind the carriage frame.

  • Page 14: Mechanism For Adjusting The Head Gap (See Figure 4)

    Oki Data CONFIDENTIAL 2.3.3 Mechanism for adjusting the head gap (see figure 4) The head gap adjustment is a mechanism to correct the gap between the print head and platen by moving the adjust lever vertically and rotating and moving the carriage shaft toward and away. The movement of the adjust lever rotates the carriage shaft that is connected directly to the adjust lever.The carriage shaft is decentered against the fulcrum of the adjust lever (section fit with the carriage shaft), therefore, the carriage shaft moves towaed and away when the adjust...

  • Page 15: Mechanism And Operation Of Ribbon Feed (See Figure 5)

    Oki Data CONFIDENTIAL 2.3.4 Mechanism and operation of ribbon feed (See figure 5) Ribbon feed is a mechanism to feed the ribbon which is driven by the stepping motor. The ribbon feed mechanism consists of: (a) Ribbon feed gear assembly (b) Ribbon cartridge Ribbon cartridge The use of a one-way feed endless ribbon provides clear print results.

  • Page 16: Paper Feed Operation

    Oki Data CONFIDENTIAL 2.3.5 Paper Feed Operation Feeding of the paper is performed by turning the platen and the pin tractor, which is driven by the LF stepping motor. Item of the paper feed mechanism are as follows: Stepping motor with gears Decelerating gear Platen Tractor feed unit...
  • Page 17 Oki Data CONFIDENTIAL Cut sheet and continuous sheet switching mechanism (See Figure 6.) Three different paper paths can be selected and set by the change lever. (a) TOP (Cut-sheet mode) To use cut-sheet paper in manual mode, turn the change lever to the “TOP” position to enter cut-sheet mode.
  • Page 18 Oki Data CONFIDENTIAL Change lever Top-Rear changswitch Rear BOTTOM Pull up gear24 Change lever Platen Platen gear Change gear Idle gear Figure 6 18 / 43471801TH Rev.1...
  • Page 19 Oki Data CONFIDENTIAL Cut-sheet feeder operation (See Figure 7.) The pulse motor used for the paper feed mechanism is mounted on the left of the frame, and the rotation of the motor is transmitted through decelerating gears (LF idle gear, platen gear) to the platen.
  • Page 20 Oki Data CONFIDENTIAL Continuous paper feed operation (Rear) (See Figure 8.) The force transmitted to the platen, rotates the tractor gear through platen gear, the idler gear and the change gear. The rotation of the tractor gear makes the pin tractor belt rotate through a sheet feeder shaft, feeding the continuous paper.
  • Page 21 Oki Data CONFIDENTIAL Bottom push feed operation (See Figure 9.) Remove the pull-up assy. By removing the tractor assy. installed in the rear and installing it above the platen, the assy. is used for bottom pull feed. The rotation of the LF motor is transmitted via the platen gear and the pull-up gear and rotates the tractor gear.
  • Page 22 Oki Data CONFIDENTIAL Paper clamp mechanism (See Figure 10.) When setting the change lever to the TOP or REAR , BOTTOM position, the operation of the front release gear arm changes according to the position of the release cam. And at the same time, the position of the cam installed to the front release gear shaft changes, and the open and close of the pressure roller.

  • Page 23: Paper Detection Mechanism

    Oki Data CONFIDENTIAL 2.3.6 Paper Detection Mechanism Cut sheet detection/Rear feed detection(See Figure 11.) When a cut sheet is inserted or a continuous form is fed by the tractor, the sensor arm is pushed down by the paper and rotated. This moves the end of the sensor arm away from the paper sensor that it has blocked, and the paper sensor detects “ON.”...
  • Page 24 Oki Data CONFIDENTIAL Top line print mechanism (See Figure 13.) The front edge of the sheet is protected by the ribbon protector so that it can stop at a position just near to the print head (0 tear off position) to start printing at the front end of the sheet, without causing the sheet to crumple or curl up.

  • Page 25: Automatic Sheet Feed (See Figure 14.)

    Oki Data CONFIDENTIAL 2.3.7 Automatic Sheet Feed (See Figure 14.) This function is used to feed in the sheet automatically up to the print start position when the cut sheet or the continuous sheet is used. [Operational procedure] When using the cut sheet Set the change lever to the TOP position.
  • Page 26 Oki Data CONFIDENTIAL When using the continouos paper Set the change lever either to the rear side or the bottom side position. (See Figure 2-16.) Set a sheet of paper either to the push tractor or the bottom tractor. Press the “FF/LOAD” switch. The LF motor starts its operation to feed the paper up to the print start position.

  • Page 27: Paper Park Function (Continuous Paper)

    Oki Data CONFIDENTIAL 2.3.8 Paper Park Function (Continuous paper) Continuous sheets which have been inserted can be reversed automatically by using the “PARK” button on the operation panel. Press the “PARK” button on the operation panel. Reverse LF is started and paper is fed in reverse until paper end occurs or 22 inches maximum have been fed.

  • Page 28: Assembly/Disassembly

    Oki Data CONFIDENTIAL ASSEMBLY/DISASSEMBLY This section explains the procedures for removing and installing various assemblies and units in the field. Description is mainly limited to the removal procedure; installation should basically be performed in the reverse sequence of the removal procedure. Precaution for Parts Replacement Remove the AC cable and the interface cable before disassembling or assembling.

  • Page 29: Service Tools

    Oki Data CONFIDENTIAL Service Tools Table 3.1 lists the tools necessary for replacing printed circuit boards and parts of units in the field. Table 3.1 Service tools Service Tool Q’ty Remarks No. 2-200 Phillips Screws screwdriver 3-5 mm No. 3-100 screwdriver Spring hook Volt/ohmmeter...

  • Page 30: Disassembly/Reassembly Procedure

    Oki Data CONFIDENTIAL Disassembly/Reassembly Procedure This section explains the assembly replacement procedures according to the following disas- sembly system. [Parts Layout] Pull-up roller Assy Access cover Assy Sheet guide Assy Tractor Assy Upper cover Platen Knob Operation panel Assy Print unit Ribbon cartridge Power Supply board Control board...
  • Page 31 Oki Data CONFIDENTIAL [How to Change Parts] This section explains how to change parts and assemblies appearing in the disassembly diagram below. Printer unit 3.3.1 Ribbon protector 3.3.2 Printhead 3.3.3 Pull-up roller Assy 3.3.4 Upper Cover, Access Cover assy and sheet Guid Assy 3.3.5 Platen Assy 3.3.6...

  • Page 32: Ribbon Protector

    Oki Data CONFIDENTIAL 3.3.1 Ribbon Protector Open the access cover 1. Open the pull-up roller cover. Raise and remove the ribbon protector 2. Assemble in the reverse order of disassembly. Pull-up cover 32 / 43471801TH Rev.1...

  • Page 33: Printhead

    Oki Data CONFIDENTIAL 3.3.2 Printhead Open the access over.(See. 3.3.1) Open the pull-up roller cover. Remove the cable cover 1. Pull up and rotate the head clamp to unclamp the printhead 2 as shown Figure 1. Disconnect the printhead 2 from Flat cable 3. Assemble in the reverse order of disassembly.

  • Page 34: Pull-Up Roller Assy

    Oki Data CONFIDENTIAL 3.3.3 Pull-up Roller Assy Open the access cover 1. Tilting the pull-up roller Assy 2 toward the back, remove from the shaft of platen Assy. Assemble in the reverse order of disassembly. Platen Assy 34 / 43471801TH Rev.1...

  • Page 35: Upper Cover Assy, Access Cover Assy And Sheet Guide Assy

    Oki Data CONFIDENTIAL 3.3.4 Upper Cover Assy, Access Cover Assy and Sheet Guide Assy Pull off the platen knob 1. Turn the change lever toward the top position. Remove the sheet guide Assy 2. Remove the tractor Assy 3. Remove the pull-up Assy 4. Remove the two screws 5 in the rear.

  • Page 36: Platen Assy

    Oki Data CONFIDENTIAL 3.3.5 Platen Assy Remove the ribbon protector.(See 3.3.1). Remove the printhead. (See 3.3.2). Remove the sheet guide Assy.(See 3.3.4). Remove the tractor Assy.(See 3.3.4). Remove the pull-up roller Assy.(See 3.3.4). Remove the upper cover.(See 3.3.4). Turn the change lever to the rear position Open the claw and remove the pull-up gear1.

  • Page 37: Printer Unit

    Oki Data CONFIDENTIAL 3.3.6 Printer unit Remove the upper cover.(See. 3.3.4) Disconnect the two head cables, homing sensor cable, SP motor cable, LF motor cable, gap sensor cable, and PE sensor cable from the connectors. Remove the four mechanical locking screws 1. Lift up and remove the printer unit 2.

  • Page 38: Carriage Cable, Homing Sensor

    Oki Data CONFIDENTIAL 3.3.7 Carriage Cable, Homing sensor Remove the ribbon protector.(See 3.3.1) Remove the head.(See 3.3.2) Remove the upper cover.(See 3.3.4) Remove the printer unit.(See 3.3.6) Open the three claws at the bottom and remove the head cable clamp. Remove Flat cable 1 from the head cable clamp 2.

  • Page 39: Idle-Pulley

    Oki Data CONFIDENTIAL 3.3.8 Idle-pulley Remove the upper cover.(See 3.3.4) Remove the printer unit.(See 3.3.6) Remove the locking screw 1 of the idle pulley bracket 2. Remove the plate tension spring 3. Remove the pitch belt 4 from the pulley on the space motor side. Remove the E-ring 5 and remove the idle pulley 6 and washer 7.

  • Page 40: Ribbon Feed Assy

    Oki Data CONFIDENTIAL 3.3.9 Ribbon Feed Assy. Remove the upper cover.(See 3.3.4) Remove the printer unit.(See 3.3.6) Remove the idle pulley.(See 3.3.8) Disengage the three claws and remove the ribbon feed Assy 1. Assemble in the reverse order of disassembly. 40 / 43471801TH Rev.1...

  • Page 41: Stepping Motor (Space)

    Oki Data CONFIDENTIAL 3.3.10 Stepping Motor (Space) Remove the upper cover. Remove the printer unit. Disconnect the space motor cable from the connector on the control board. Remove the locking screw 1 of the idle pulley bracket. Push the mini pitch belt in the direction of the arrow and remove the mini pitch belt 2 from the space motor pulley.

  • Page 42: Lf Motor

    Oki Data CONFIDENTIAL 3.3.11 LF Motor Remove the upper cover.(See. 3.3.4) Remove the printer unit.(See. 3.3.6) Remove the two screws 1 locking the LF motor in place 3 and remove the LF motor 2. The LF motor plate 3 will come off with the motor. Assemble in the reverse order of disassembly.

  • Page 43: Gap Sensor Cable, Gap Sw And Continuous-Form/Cut-Sheet Sw

    Oki Data CONFIDENTIAL 3.3.12 Gap Sensor Cable, Gap SW and continuous-form/cut-sheet SW Remove the upper cover.(See. 3.3.4) Remove the printer unit.(See. 3.3.6) Remove the LF motor.(See. 3.3.11) Turn the adjustment knob 1 in the direction of arrow A, detach the two claws, and remove the adjustment lever (HG) 2.

  • Page 44: Slider Pice-Slider

    Oki Data CONFIDENTIAL 3.3.13 Slider Pice-Slider Remove the ribbon protector.(See 3.3.1). Remove the printhead.(See 3.3.2). Remove the upper cover.(See 3.3.4). Remove the cable guide 1. Remove the two screws 2 and remove the carriage plate 3. Remove the slider 4 and the slider piece5 from the carriage plate. Assemble in the reverse order of disassembly.

  • Page 45: Mini Pitch Belt

    Oki Data CONFIDENTIAL 3.3.14 Mini Pitch Belt Remove the printhead.(See. 3.3.2) Remove the upper cover.(See. 3.3.4) Remove the printer unit.(See. 3.3.6) Remove the idle pulley bracket.(See. 3.3.8) Remove the two screws 1 and remove the carriage plate 2. Remove the mini pitch belt 3. Assemble in the reverse order of disassembly.

  • Page 46: Paper Pan Assy, Roller Assy

    Oki Data CONFIDENTIAL 3.3.15 Paper Pan Assy, Roller Assy Remove the upper cover.(See. 3.3.4) Remove the printer unit.(See. 3.3.6) Remove the platen.(See. 3.3.5) Remove the sensor cable from the claw on the side frame. Turn the right and left claws on the rear beam 1 in the direction of the arrow, and remove from the side frame.

  • Page 47: Bottom Sensor, Photo Interrupter And Sensor Cord (6P)

    Oki Data CONFIDENTIAL 3.3.16 Bottom sensor, photo interrupter and sensor cord (6P) Remove the upper cover.(See. 3.3.4) Remove the printer unit.(See. 3.3.6) Remove the platen.(See. 3.3.5) Remove the paper pan Assy.(See. 3.3.15) Release the two claws of the sensor arm holder Assy. 1 and remove the paper pan Assy. Remove the sensor arm 2.

  • Page 48: Operation Panel Board And Operation Panel Cord

    Oki Data CONFIDENTIAL 3.3.17 Operation Panel Board and Operation Panel cord Remove the upper cover.(See. 3.3.4) Release the two claws and remove the operation panel frame Assy 1. Release the two claws of the operation panel frame 1, remove the board LSO 2 and core 3.

  • Page 49: Control Board Assy

    Oki Data CONFIDENTIAL 3.3.18 Control Board Assy. (1) Remove the upper cover.(See. 3.3.4) (2) Remove the printer unit.(See. 3.3.6) (3) Disconnect the serial cable from the connector on the control board. (4) Disconnect the power supply cable from the connector. (5) Remove the three screws 1.

  • Page 50: Power Supply Assy

    Oki Data CONFIDENTIAL 3.3.19 Power supply Assy Remove the upper cover.(See. 3.3.4) Remove the printer unit.(See. 3.3.6) Disconnect the serial cable 1 from the control board. Remove the two screws 2 of the serial cable connector 1 and disconnect the connector 3. Disconnect the power supply cable from the control board and remove the cable from the lower cover.

  • Page 51: Adjustment

    Oki Data CONFIDENTIAL ADJUSTMENT Be sure to carry out this adjustment with the printer mechanism mounted on the lower cover. Be sure to carry out this adjustment operation on a level and highly rigid work table (flatness: less than 0.039 inch or 1 mm) so as to minimize adjustment error. Perform this adjustment at normal room temperature (20°C ±...

  • Page 52: Gap Between Platen And Print Head

    Oki Data CONFIDENTIAL Item Specification Drawing Adjustment method Gap between platen <<Checking>> Check the platen in and print head three places: right and left ends and center. <<Adjustment procedure>> (1) If the right and left platen gaps differ, rotate the adjust knob on the right side of the printer...

  • Page 53: Paper Top Positioning Distance Check

    Oki Data CONFIDENTIAL Item Specification Drawing Adjustment method Paper top positioning Preset (1) Set 1P-55 kg pa- A, B – 0.5mm ± 0.5 mm per. distance check 1.Set cut-sheet paper (manual feed) in the sheet guide. 2.Set continuous- form roll paper on the rear Top position tractor or...
  • Page 54 Oki Data CONFIDENTIAL Item Specification Drawing Adjustment method Correcting the paper Preset (1) Turn on power ± 0.5 mm top positioning while holding distance down 1SW. Preset Correction Move 20/144 inches (3.53 mm) down from the reference position. (2) You will enter Move 19/144 inches (3.35 mm) down from the reference position.

  • Page 55: Correcting Cut-Sheet 40-Line Feed Height

    Oki Data CONFIDENTIAL Item Specification Drawing Adjustment method C ± 0.5 mm Correcting cut-sheet (1) Set cut-sheet (manual feed) A4- 40-line feed height 55 kg paper in the sheet guide. (2) Print the test data from the PC dedicated to testing.

  • Page 56: Correcting Both-Direction Print Registration

    Oki Data CONFIDENTIAL Item Specification Drawing Adjustment method Within ± 0.1 Correcting both- (1) Set paper with 55 Forward kg ream weight. direction print registration (2) Turn on power Reverse while holding down 1SW. (3) Press 4SW and ±0.15 print the menu pattern.

  • Page 57: Paper Cut Position Check

    Oki Data CONFIDENTIAL Item Specification Drawing Adjustment method Paper cut position 0~0.3 mm (1) Set a continuous- form roll (1P-55 check kg, 10 inches) on the rear tractor. Perforations Continuous-form (2) Press 2SW. (3) Press 3SW to 0~0.3 feed paper into the printer.
  • Page 58 Oki Data CONFIDENTIAL Item Specification Drawing Adjustment method Correcting paper cut 0~0.3 mm (1) Turn on power position while holding Preset Correction down 1SW. Move 20/144 inches (3.53 mm) down from the reference position. Move 19/144 inches (3.35 mm) down from the reference position. (2) You will enter Move 18/144 inches (3.18 mm) down from the reference position.

  • Page 59: Cleaning And Lubrication

    Oki Data CONFIDENTIAL CLEANING AND LUBRICATION Cleaning [Cautions] Be sure to turn OFF the AC POWER switch before cleaning. Remove the AC power cord from the printer. Avoid dust inside the printer mechanism when cleaning. If a lubricated part has been cleaned, be sure to apply lubricating oil to that portion after cleaning.

  • Page 60: Lubrication

    Oki Data CONFIDENTIAL Lubrication This printer is designed to be maintenance free and requires no lubrication during normal operation. However it is necessary to apply lubricant in case the printer is disassembled, reassembled, cleaned or parts have been changed. Cleaning time Remarks: 1) Turn off the power before cleaning.
  • Page 61 Oki Data CONFIDENTIAL Lubrication point LF drive system Moderate amount of GEP to the sliding surfaces of the idle pulley and idle pulley shaft. Release lever Apply a small amount of GEP to the sliding surface of the change gear. Apply a small amount of GEP to the release lever surface that slides on the shaft.
  • Page 62 Oki Data CONFIDENTIAL Apply a small amount of GEP to the gear tooth surfaces. Apply a small amount of GEP to the shaft sliding surfaces. Apply a small amount of GEP to the sliding surface of the release lever. Apply a small amount of GEP to the gear tooth surfaces. 62 / 43471801TH Rev.1...
  • Page 63 Oki Data CONFIDENTIAL Adjustment lever Moderate amount of GEP to the surface that slides on the SW lever Moderate amount of GEP to the surfaces that slide on side frame R Moderate amount of GEP to the sliding surface of the detent Adjustment lever 63 / 43471801TH Rev.1...
  • Page 64 Oki Data CONFIDENTIAL Tractor assy Apply a small amount of GEP to the sliding surfaces of the tractor-side side frame R and the sprocket wheel. Apply a small amount of GEP to the surface that slides along the tractor Apply a small amount of GEP Drive shaft to the gear tooth surfaces.
  • Page 65 Oki Data CONFIDENTIAL Pull-up roller assy Pull-up frame Pull-up roller Apply a small amount of GEP to the gear tooth surfaces. Apply a small amount of GEP to the sliding surfaces of the pull-up roller frame and the pull-up roller shaft. Apply a small amount of GEP to the sliding surfaces of the pull-up roller frame...

  • Page 66: Troubleshooting And Repair

    Oki Data CONFIDENTIAL TROUBLESHOOTING AND REPAIR Items to Check Before Repair Check the inspection items specified in the instruction manual. Find out as many details of the trouble as possible from the customer. Inspect in the conditions as close as possible to those at the time the trouble occurred. Proceed with the repair as follows: Check the trouble status according to Table 6.1 for the details of the trouble.
  • Page 67 Oki Data CONFIDENTIAL LED Indication Printer status corresponding to each LED that stays lit, stays off, or flashing is listed below. STATUS ALARM Green Printer Status Green Green REMARK Power ON (printer being initialized) *3 Power OFF SELECT (on-line) DESELECT (off-line) ✩...
  • Page 68 Oki Data CONFIDENTIAL Alarm/Error Indications The following table summarizes LED indications during alarm states. 1) Recoverable Alarms STATUS ALARM Printer Status Green Green Green REMARK Paper end ✩ Paper jam ✩ Media alarm ✩ Head thermal alarm (stopped) status (on-line) Meanings of symbols: O: Stays lit, X: Stays off, ✩: Flashes G: stays lit darkly, No symbol: Previous status The flash cycle time of LED is 400ms.
  • Page 69 Oki Data CONFIDENTIAL (3) Items to search Table 6-1 Section Fault Specific Content to Refer Power source abnormality There is no response when turning on the power switch. (No lamps illuminate.) Reset circuit abnormality The carriage does not move at power ON and lamp some illuminates faintly.
  • Page 70 Oki Data CONFIDENTIAL There is no response when turning On the power switch. (No lamps illuminate.) Is the AC cord conduction normal? N: Replace the AC cord. Y: Is the AC fuse (F1) in the Pow Unit burned out? Y: Replace the fuse (F1). N: Is the LF Motor Cable disconnected from the LF MOT Connector on the L09 print circuit board, or is the SP Motor Cable disconnected from the SP MOT Connector on the L09 print circuit board?
  • Page 71 Oki Data CONFIDENTIAL Some lamps illumitate and stay ON. Is the operator panel connector (OP) cord properly? N: Connect the cord properly. Y: Replace the LSO print circuit board. N: Replace the L09 print circuit board. Some switches do not function or functions continuously. Is the operator panel connector (OP) cord properly? N: Connect the cord properly.
  • Page 72 Oki Data CONFIDENTIAL The movement of the carriage is abnormal (runs out of control, vibrates, stops during homing, etc.) and an alarm is indicated. Is the SENSOR L cord connected, and the attachment of a home position sensor properly? N: Connect the cord or attachment the home position sensor properly. Y: Is the output of SENSOR2-N (SENSOR2 connector - 2 pin) signals proper? N: Replace the home position sensor.
  • Page 73 Oki Data CONFIDENTIAL Line is not fed upon receiving/printing data. Is the LF motor cord connected properly? N: Connect the cord properly. Y: Turn OFF the power, remove the LF motor connector, and confirm that the resistance between pins 1-2 and 3-4 of the LF motor connector (LFMOT) is approximately 12.1Ω±10%.
  • Page 74 Oki Data CONFIDENTIAL Print dots are missing. Is the head gap set at the regulated value? N: Readjust the head gap properly. Y: Are dots still missing after replacing the print head? N: End the procedure. Y: Are dots still missing after replacing the space motor assembly? N: End the procedure.
  • Page 75 Oki Data CONFIDENTIAL Upon receiving/printing data: Spacing or printing is not performed and Lamp A is illuminating and goes on. Is the interface cable connected properly? N: Connect the cable properly. Y: Can a self-test print be performed? N: Replace the L09 print circuit board. Y: Does Lamp A go ON/OFF each time Switch 1 1 1 1 1 is pressed in a receive- standby mode after completing homing? N: Replace the L09 print circuit board.

  • Page 76: Program Update

    Oki Data CONFIDENTIAL PROGRAM UPDATE Prepare to amount the ROM Please work from (2) if you have already remove the upper cover or no mount the PCB yet. Remove the two screws on the left and the right that hold the upper cover in place. Check the ROM socket position on the board.

  • Page 77: Operation To Start Flash Download

    Oki Data CONFIDENTIAL Operation to start flash download. Flash download steps are explained below. 7.3.1 Execution of the rewite operation Install the EPROM to download the board and close the upper cover. Start Maintenance mode 2 by turning the printer on while holding down "SEL"+"LF/ FF"+"TEAR"...

  • Page 78: Operation Check

    Attach the printer upper cover then confirm that the printer starts with the FLASH correctly by POW ON. Press "LOAD/EJECT" + "TEAR" SW and power on the printer then execute Local Test and confirm "F/W REV". <Local test header> ML1120 MEI Z F/Wyy.yy 43441001YR-ZZ CG 03.02 yy.yy...

  • Page 79: Parts Replaced Periodically

    Oki Data CONFIDENTIAL PARTS REPLACED PERIODICALLY The following parts must be replaced at determined intervals. Replacement intervals Name Part number <Actual operating hours in H> Idle pulley 43473801 1000H Ribbon Protector Assy 43514501 1000H 79 / 43471801TH Rev.1...

  • Page 80: Appendix A Pcb Layout

    Oki Data CONFIDENTIAL APPENDIX A PCB LAYOUT - PCB List - Circuit board, L09 (Main Controller) Circuit board, LSO (Operator Panel) 80 / 43471801TH Rev.1...
  • Page 81 Oki Data CONFIDENTIAL • L09-Printed-Circuit Board OSC3 DRAM CENDV SENSOR1 LFDV SENSOR2 1 SENSOR3 SPMOT LFMOT • LSO-Printed-Circuit Board LED1 LED2 LED3 LED4 81 / 43471801TH Rev.1...

  • Page 82: 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 Regulator Capacitor Electrolytic capacitor...
  • Page 83 Oki Data CONFIDENTIAL Symbol Mark Description Frame ground Dot head (element) Coil 339 Comparator THERMISTOR Thermistor Signal ground Transformer Photo sensor Fuse 83 / 83 43471801TH Rev.1...

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