Oki Microline 3320 Maintenance Manual
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Oki Microline 3320 Maintenance Manual

Oki printer maintenance manual
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MICROLINE 3320/3321
PRINTER

Maintenance Manual

All specifications are subject to change without notice.

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Summary of Contents for Oki Microline 3320

  • Page 1: Maintenance Manual

    ¡ MICROLINE 3320/3321 PRINTER Maintenance Manual All specifications are subject to change without notice.
  • Page 2 PREFACE This maintenance manual describes how to maintain the Microline 3320/3321 printer in the field. This manual is for customer engineers. For further information, refer to the Users Manual for handling or operating the equipment.

  • Page 3: Table Of Contents

    CONFIGURATION Standard Printer Configuration Options THEORY OF OPERATION Electrical Operation 2.1.1 Summary 2.1.2 Microprocessor and the Peripheral Circuit 2.1.3 Initialization 2.1.4 Parallel Interface Control 2.1.5 Print Control 2.1.6 SP/LF Motor Control 2.1.7 Operation Panel 2.1.8 Alarm Circuit 2.1.9 Power Supply Circuit Mechanical Operation 2.2.1...
  • Page 4 3.3.9 Carriage Cable 3.3.10 Backup Roller Holder Assy 3.3.11 Platen Assy 3.3.12 Driver Board (SDDV) 3.3.13 LF Motor 3.3.14 Operation Panel PCB (LEOP) 3.3.15 Control/Power Supply Board (SDCT) 3.3.16 Transformer Assy 3.3.17 Change Lever and Gears 3.3.18 Carriage Shaft 3.3.19 Paper Pan 3.3.20 Rear Tractor Assy 3.3.21 Rear Pressure Assy 3.3.22 Switch Lever...

  • Page 5: Configuration

    1. CONFIGURATION...

  • Page 6: Standard Printer Configuration

    CONFIGURATION 1.1. Standard Printer Configuration This printer consists of the following assemblies: Sheet guide assy Control/Power supply assy Driver board Upper cover Transformer assy Pull-up roller assy Operation panel assy Main chassis assy Figure 1-1 Configuration 1 – 1 Platen knob...

  • Page 7: Options

    Options Cut sheet feeder unit (CSF) (Narrow and wide versions available) Dual-bin CSF Pull-tractor assy Single-bin CSF Attachment assy 1 – 2...
  • Page 8 Bottom push tractor unit Roll paper stand (Narrow only) Serial I/F • RS232C • RS422A • Current Loop 1 – 3...

  • Page 9: Theory Of Operation

    2. THEORY OF OPERATION...

  • Page 10: Electrical Operation

    Microprocessor (Q7: 67X640) This processor is a CMOS single-chip computer with integrated peripheral device functions and a 16 bit MPU core, all OKI original architecture. The processor has a 20 bit address bus and a 16 bit data bus. It is capable of accessing up to 1M word program memory and 1M bytes of data memory.
  • Page 11 Kbits 2 – 2...
  • Page 12 Program ROM This is a 256 16 bits (4M bit) [MAX] EPROM with the control program for the printer stored. The MPU executes instructions under this program. The program ROM is assigned to the program memory area of the MPU and is fetched by the PSEN signal of the MPU.
  • Page 13 RAM (MSM51C464A-80RS) The RAM is CMOS dynamic RAM with (64K (such as receiving buffer, printing buffer, DLL buffer and working buffer). The following shows the examples of the memory access operation. Clockout* A0~A7 CS1~CS4 D0~D7 (Read) D0~D7 (Write) 8-bit bus, byte instruction * Clockout is provided when the original excitation is selected.
  • Page 14 EEPROM The EEPROM is a CMOS serial I/O type memory which is capable of electrically erasing and writing 1,024 bits. The EEPROM contains menu data. The following shows the memory access operation. EEDIN-P EECS-P EEDOUT-P EECLK-P PRE = O PE = X EECS-P EECLK-P Operation...
  • Page 15 This LSI detects and controls the SP motor speeds by monitoring the two phase sensor signals obtained from the DC motors and modifying the excitation phases as appropriate. This LSI is connected in multiplex to the MPU. Clockout* A0~A19 LSICS D0~D15 (Read) D0~D15...

  • Page 16: Initialization

    2.1.3 Initialization This printer is initialized when the power is turned on or when the I-PRIME-N signal is input from the host side via the parallel interface. For the initialize operation, the RST-N signal is first output from the reset circuit to reset the MPUs and LSIs.

  • Page 17: Parallel Interface Control

    2.1.4 Parallel Interface Control The parallel data input from the host to the interfaced LSI is latched to its internal register at the falling edge of the STROBE-N signal. At the same time, the LSI sets the BUSY signal to the high level to inform the host that the data is being processed, and outputs the RXD signal to inform the MPU of data reception.

  • Page 18: Print Control

    2.1.5 Print Control Print data is transmitted as parallel data (HEAD1~HEAD9) from LSI to print head. LSI generates print timing and drive time. Control/Power Supply Board A/D bus HEAD DRIVE CURRENT Driver Board DRIVER Print Data HEAD1-N~ HEAD9-N HEAD DRIVE TIMING CHART 2 –...
  • Page 19 Print Compensation Control The print compensation can be made as shown below: (a) Voltage compensation (See 2.1.8 “Alarm Circuit.”) (b) Temperature compensation (See 2.1.8 “Alarm Circuit.”) Pin stroke compensation Platen Print Head Pin 1, 2 8, 9 Pin coil current Pin 1, 2, 8, 9 Pin 3~6...
  • Page 20 (e) Print mode compensation According to the thickness of the printing medium, the print mode is compensated as shown in the table below: Head Gap Range Print speed 100% Drive time Short Long (Drive time lengthens at each step.) 2 – 11...

  • Page 21: Sp/Lf Motor Control

    2.1.6 SP/LF Motor Control Space motor control The SP motor driver (HA13412) drives the three-phase brushless motor based on the phase signal (SPU, SPV and SPW) and the speed instruction data from the LSI. The MPU can identify the current speed of the space motor by measuring through the LSI the pulse length of the output (øA, øB) of the slit encoder included in the space motor.
  • Page 22 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 LSI divides these edge pulse signals in accordance with the print pitch, and sends the IPT signal to provide dot-on timing and carriage position detection timing. PHASE-A PHASE-B 1/720"...
  • Page 23 LF motor control The LF motor driver (MTD2005F) drives the LF motor in two-phase or 1-2 phase bipolar, based on the phase changeover data and the output current data from the LSI. The data from the LSI is processed by a specific register contained in the LF motor driver to measure the overdrive time and to change the phase.

  • Page 24: Operation Panel

    2.1.7 Operation Panel The clock synchronization OPCLK of LSI is used to input the switch data and output the LED data through the operation panel control LSI (IC1: BU5148S). OPTXD OPTD OPCLK OPCK OPCLR-N NPA2 OPRXD OPRD A 2-byte (15 bits + 1 even parity bit) command (OPTXD) is transmitted to the LSI (BU5148S) in synchronization with the OPCLK signal.
  • Page 25 2 – 16...

  • Page 26: Alarm Circuit

    2.1.8 Alarm Circuit Head drive time alarm circuit This circuit monitors the drive time using the HDALM signal interlocked with the overdrive signal of each drive circuit. If the drive time of any drive circuit exceeds the specified time, the drive fault alarm circuit sends an ALARM-N signal to turn on the SCR (SO).
  • Page 27 Head overheat alarm The voltage of the output TSD signal of the thermistors, one of which is contained in the print head and the other in the print head driver, is monitored by the CPU/AD port to control the voltage Temp Mode Speed...

  • Page 28: Power Supply Circuit

    2.1.9 Power Supply Circuit This power supply circuit supplies the +5VDC, +8VDC, +40VDC, 10VAC. Fuse The uses of output voltages and signals are described below. Voltage/signal Logic IC/LED drive voltage Serial interface line voltage and SP motor driver + 40V Printhead, LF motor drive voltage, SP motor drive voltage AC 10V Option board...

  • Page 29: Mechanical Operation

    Mechanical Operation 2.2.1 Printhead Mechanism and Operation (See Figure 2-2.) The printhead is a spring charged 9-pin driving head using a permanent magnet. It is attached to the carriage, which moves in parallel with the platen. Electrically, this unit is connected to the control circuits through the control board.
  • Page 30 Operation of printhead (See Figure 2-3.) (a) When the printhead is idle, the armature is attracted by a permanent magnet and the spring fixing the armature is compressed. The print wires fixed to each armature are thus concealed under the wire guide. (b) When a signal for a character to be printed is detected, a current flows through the coil.
  • Page 31 Paper Platen When printing When not printing Print wire Paper Print wire Wire guide Yoke Spacer Paper Figure 2-3 2 – 22 Printhead Armature assembly Thermistor Magnet assembly...

  • Page 32: Spacing Operation

    2.2.2 Spacing Operation (See Figure 2-4.) The spacing mechanism consists of a carriage shaft mounted in parallel with the platen, and a carriage frame that moves along the shaft. It is driven by a DC motor mounted on the bottom of the carriage frame.
  • Page 33 Print Head Carriage shaft Space rack Carriage frame Encoder disk Encoder sensor Motor gear Slider Guide rail Figure 2-4 2 – 24...

  • Page 34: Head Gap Adjusting

    PC board. The printer will reduce the printing speed automatically to ensure that adequate printing pressure is maintained for multipart paper.
  • Page 35 Range Adjusting lever Range from Adjusting screw Adjusting cam Range from Platen Adjusting screw Idler gear Adjusting gear Printhead C.C.W. Guide rail C.W. Figure 2-5 2 – 26 Carriage shaft Printhead Narrows Platen Widens...

  • Page 36: Ribbon Drive

    2.2.4 Ribbon Drive (See Figure 2-6.) The ribbon driver mechanism moves the ribbon in synchronization with the space motor operation. The ribbon drive mechanism consist of the following items: (a) Ribbon drive gear assembly (b) Ribbon gear (space motor) Ribbon cartridge Ribbon cartridge An endless ribbon with a single direction feed is used.
  • Page 37 Ribbon cartridge Drive gear Ink tank Figure 2-6 2 – 28...

  • Page 38: Paper Feed Operation

    2.2.5 Paper Feed Operation Feeding of the paper is performed by turning the platen and the pin tractor, which is driven by the LF pulse motor. Item of the paper feed mechanism are as follows: Pulse motor with gears Decelerating gear Platen Tractor feed unit Pressure roller...
  • Page 39 Cut sheet and continuous sheet switching mechanism (See Figure 2-8.) Three different paper paths can be selected and set by the change lever. TOP (for cut sheet) When the cut sheet is used in the manual mode or fed by the CSF (option), set the change lever at the position marked TOP.
  • Page 40 BOTTOM (Continuous sheet from bottom feeder) (option) When the change lever is set in the BOTTOM position, the rotation of the platen is transmitted to the drive gear of the bottom tractor feed unit through the idle gear to feed the sheet which has been set in the bottom tractor feed. At the same time, the switch lever turns on the bottom switch, to confirm to the control board that you are in the continuous sheet mode.
  • Page 41 Control Power supply Assy Bottom switch Switch lever Change gear shaft Rear switch Change lever Release shaft Change arm Platen BOTTOM Change lever REAR Tractor gear Change gear Platen gear (R) Reset spring Idle gear (Bottom tractor unit) Figure 2-8 2 –...
  • Page 42 Cut-sheet feeder operation (See Figure 2-9.) 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. When using cut-sheet paper, the change lever must be in the TOP position to grab the paper, while disengaging the push tractor.
  • Page 43 Continuous paper feed operation (Rear) (See Figure 2-10.) 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 44 Push and pull tractor mechanism (Option) (See Figure 2-11). This mechanism consist 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 45 Pull tractor mechanism (option) (See Figure 2-12.) Bottom feed of continuous sheets is possible only when an optional pull tractor unit is installed. The rotation of the platen is transmitted to the idle gear of the pull tractor unit through the platen gear at the left end of the platen.
  • Page 46 Bottom push feed operation (Option) (See Figure 2-13.) The bottom push feed of the continuous sheet is possible only when the bottom tractor feed unit is installed. When the platen rotates, the rotational force of the platen is transmitted through the tractor idle gear and the tractor change gear to the tractor drive gear of the bottom push tractor, and the sheet of paper is fed in to the print start position.
  • Page 47 Paper clamp mechanism (See Figure 2-14.) When setting the change lever to the BOTTOM , TOP or REAR 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 48 Release cam Platen BOTTOM REAR Change lever Front release gear arm Figure 2-14 2 – 39...

  • Page 49: Paper Detection Mechanism

    2.2.6 Paper Detection Mechanism (See Figure 2-15.) Cut sheet detection When the cut sheet is inserted, the point A is pushed backward and the paper near end lever B rotates counter clockwise (CCW). At this time, the rear sensor lever rotates counterclockwise (CCW), the rear sensor lever and pulls out of the rear and top paper end sensor to detect that the sheet is provided.
  • Page 50 Paper end sensor Sensor lever Shaded portion Paper end lever Bottom paper end lever Figure 2-15 2 – 41...
  • Page 51 Top line print mechanism (See Figure 2-16.) 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 52 Platen Ribbon protector Printhead Carriage frame assembly Figure 2-16 2 – 43...

  • Page 53: Automatic Sheet Feed

    2.2.7 Automatic Sheet Feed 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. (See Figure 2-17.) Insert a sheet of paper between the platen and the paper shoot.
  • Page 54 When using the continouos paper Set the change lever either to the rear side or the bottom side position. (See Figure 2-17.) 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 55: Paper Park Function

    2.2.8 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 19 inches maximum have been fed.

  • Page 56: Assembly/Disassembly

    3. ASSEMBLY/DISASSEMBLY...

  • Page 57: Precautions For Parts Replacement

    Remove the AC cable from the inlet on the printer (only 200V). (b) To connect the AC cable again, connect it to the inlet on the printer (only 200V) first, then insert the AC input plug into a receptacle.

  • Page 58: Service Tools

    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 No. 1-100 Phillips screwdriver No. 2-200 Phillips screwdriver No. 3-100 screwdriver Spring hook J-YX4025–83335-3 Volt/ohmmeter Feeler gauge Pliers...

  • Page 59: Disassembly/Reassembly Procedure

    Disassembly/Reassembly Procedure This section explains the assembly replacement procedures according to the following disassembly system. [Parts Layout] Upper cover assy Transformer assy Control/Power supply board Driver board Operation panel board Printer unit Figure 3-1 Printer unit 3 – 3 Printhead...
  • Page 60 [How to Change Parts] This section explains how to change parts and assemblies appearing in the disassembly diagram below. 3.3.1 Printer unit 3.3.3 3.3.4 Printhead 3.3.2 Ribbon protector Pull-up roller assy Upper cover, access cover and sheet guide 3.3.5 Gear case assy 3.3.6...
  • Page 61 3.3.1 Printhead Open the access over. Pull up and rotate the head clamp Disconnect the printhead To install, follow the removal steps in the reverse order. Notes on installation: Insert the printhead The head clamp as shown fig. 3.3.2. Be sure to check the gap between platen and printhead (see 4). Be careful not to touch the print head while it is very hot.

  • Page 62: Ribbon Protector

    3.3.2 Ribbon Protector Remove the printhead (see 3.3.1). Open the pull-up roller cover Raise and remove the ribbon protector To install, follow the removal steps in the reverse order. 3 – 6...

  • Page 63: Pull-Up Roller Assy

    3.3.3 Pull-up Roller Assy Open the access cover Lift up the sheet guide Assy Tilting the pull-up roller Assy To install, follow the removal steps in the reverse order. Note: Remove the sheet guide Assy to remove. toward the front, remove from the shaft of platen Assy before installing or removing the pull-up roller Assy 3 –...

  • Page 64: Upper Cover Assy, Access Cover Assy And Sheet Guide Assy

    3.3.4 Upper Cover Assy, Access Cover Assy and Sheet Guide Assy Pull off the platen knob Turn the change lever Insert a flat-blade screwdriver into grooves (5 places) (4 places for narrow type) of frame and twist to disengage claws of upper cover Raise the front side of upper cover Assy (6 places) (5 places for narrow type) of frame.

  • Page 65: Gear Case Assy

    3.3.5 Gear Case Assy Remove the printhead (see 3.31). Remove the upper cover (see 3.3.4 (1) – (5)). Move the carriage Assy to right hand side, remove two screws Disconnect a carriage cable. Disengage claws (4 places). Using a flat-blade screwdriver, push to widen the claw for easy disengagement. Remove the gear case Assy cable clamp of the gear case Assy.

  • Page 66: Pc Connector

    3.3.6 PC Connector Remove the printhead (see 3.3.1). Remove the upper cover (see 3.3.4 (1) – (5)). Remove the gear case Assy (see 3.3.5). Remove the PC connector To install, follow the removal steps in the reverse order. Note on installation: Do not touch the space motor dust or foreign matters.

  • Page 67: Space Motor, Guide Roller Assy

    3.3.7 Space Motor, Guide Roller Assy Remove the printhead (see 3.3.1). Remove the upper cover (see 3.3.4 (1) – (5)). Remove the gear case Assy (see 3.3.5). Remove the PC connector (see 3.3.6). Remove screw , then the guide roller Assy To install, follow the removal steps in the reverse order.

  • Page 68: Space Rack

    3.3.8 Space Rack Remove the printhead (see 3.3.1). Remove the upper cover (see 3.3.4 (1) – (5)). Remove the gear case Assy (see 3.3.5). Remove the space motor (see 3.3.7). Remove the spring Disengage the claw on left side of space rack rack in upper direction.

  • Page 69: Carriage Cable

    3.3.9 Carriage Cable Remove the printhead (see 3.3.1). Remove the upper cover (see 3.3.4 (1) – (5)). Remove the gear case Assy (see 3.3.5). Remove the space motor (see 3.3.7). Remove the space rack (3.3.8). Remove two screws and disconnect cable from connector Remove carriage cable To install, follow the removal steps in the reverse order.

  • Page 70: Backup Roller Holder Assy

    3.3.10 Backup Roller Holder Assy Remove the printhead (see 3.3.1), Remove the upper cover (see 3.3.4 (1) – (5)). Remove the gear case Assy (see 3.3.5). Remove the space motor (see 3.3.7). Remove the backup roller spring Disengage claws (2 places) of roller holder from the carriage frame backup roller holder assy To install, follow the removal steps in the reverse order.

  • Page 71: Platen Assy

    3.3.11 Platen Assy Remove the printhead (see 3.3.1). Remove the ribbon protector (see 3.3.2). Remove the pull-up roller Assy (see 3.3.3). Remove the upper cover (see 3.3.1 (1) – (5)). Turn the change lever Push in the lock levers by 90 . Remove the platen Assy To install, follow the removal steps in the reverse order.

  • Page 72: Driver Board (Sddv)

    3.3.12 Driver Board (SDDV) Remove the upper cover (see 3.3.4 (1) – (5)). Remove two screws Disconnect all cables from driver board To install, follow the removal steps in the reverse order. Note on installation: Insert one sensor lever , and release the driver board between sensor when installing the driver board 3 –...

  • Page 73: Lf Motor

    3.3.13 LF Motor Remove the printhead (see 3.3.1). Remove the ribbon protector (see 3.3.2). Remove the pull-up roller Assy (see 3.3.3). Remove the upper cover (see 3.3.4 (1) – (5)). Remove the platen Assy (see 3.3.11). Remove the driver board (see 3.3.12). Remove the left FG plate Release the lock A to remove the LF motor To install, follow the removal steps in the reverse order.

  • Page 74: Operation Panel Pcb (Leop)

    3.3.14 Operation Panel PCB (LEOP) Remove the upper cover (see 3.3.4 (1) – (5)). Disconnect the cable Disengage claws on both sides from the frame, and remove the operation panel Open claws (8 places) and remove the operation panel PCB To install, follow the removal steps in the reverse order.

  • Page 75: Control/Power Supply Board (Sdct)

    3.3.15 Control/Power Supply Board (SDCT) Remove the upper cover (see 3.3.4 (1) – (5)). Disconnect two flexible cable Remove the cable Remove two screws To install, follow the removal steps in the reverse order. Remark on assembly: To mount the Control/Power Supply Board, set the change lever to the top position so that the Switch Lever from the connector from the connector...

  • Page 76: Transformer Assy

    3.3.16 Transformer Assy Remove the upper cover (see 3.3.4 (1) – (5)). Remove AC inlet Disconnect the cable Remove a screw Remove two screws and AC switch from the frame guide. from the connector on the Control/Power Supply Board and disconnect ground cable and shift the transformer Assy 3 –...

  • Page 77: Change Lever And Gears

    3.3.17 Change Lever and Gears Remove the upper cover (see 3.3.4 (1) – (5)). Remove the reset spring gear Push back the protrusion of the Change Gear Shaft remove the change lever To perform mounting, follow the reverse procedure of removal. Remark on assembly: To insert the change lever into the Change Gear Shaft , then remove the idle gear...

  • Page 78: Carriage Shaft

    3.3.18 Carriage Shaft Remove the printhead (see 3.3.1). Remove the upper cover (see 3.3.4 (1) – (5)). Remove the driver board (see 3.3.12). Remove the FG plate (L) Slide the carriage shaft To perform mounting, follow the reverse procedure of removal. Note on installation: After installation, check and adjust the gap between platen and printhead (see 4-1).

  • Page 79: Paper Pan

    3.3.19 Paper Pan Remove the printhead (see 3.3.1). Remove the ribbon protector (see 3.3.2). Remove the pull-up roller assy (see 3.3.2). Remove the upper cover assy (see 3.3.4 (1) – (5)). Remove the platen assy (see 3.3.11). Release claws Lift up the paper chute assy To perform mounting, follow the reverse procedure of removal.

  • Page 80: Rear Tractor Assy

    3.3.20 Rear Tractor Assy Remove the printhead (see 3.3.1). Remove the ribbon protector (see 3.3.2). Remove the pull-up roller assy (see 3.3.3) Remove the upper cover (see 3.3.4 (1) – (5)). Remove the reset spring (see 3.3.17 (3)) Remove the tractor gear Shift the drive shaft To perform mounting, follow the reverse procedure of removal.

  • Page 81: Rear Pressure Assy

    3.3.21 Rear Pressure Assy Remove the upper cover (see 3.3.4 (1) – (5)). Remove the change lever and gears (see 3.3.17). Remove the paper pan (see 3.3.19). Remove the rear pressure roller Rotate the release shaft Match the Main Frame Rib A with the protrusion B of the Release Shaft. Remove rear pressure SP assy To install, follow the removal step in the reverse order.

  • Page 82: Switch Lever

    3.3.22 Switch Lever Remove the upper cover (see 3.3.4 (1) – (5)). Remove the change lever and gears (see 3.3.17). Remove the paper pan (see 3.3.19). Remove the rear pressure assy (see 3.3.21). Pull the Switch Lever toward you and remove it upward. To install, follow the removal step in the reverse order.

  • Page 83: Adjustment

    4. ADJUSTMENT...
  • Page 84 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.
  • Page 85 Item Specification 4–1–1 Gap between the plat- en and the print head 1) Parallelism justment Variation of value at the left, the center and the right shall be less than 0.02 mm 0.41 0.03 mm 2) Initial adjustment Carriage shaft Left Range: 1 Range: 5...
  • Page 86 Item Specification Adjust gear Adjust cam 4–1–2 Measure variation of G a p = 0 . 7 1 gap when range is 0.05 at the changed. range 5. Drawing Adjust lever Adjust gear Adjust spring Print head Adjust lever 4 – 3 Adjustment method Note 1) The head gap shall be...
  • Page 87 Item Specification Gap between the con- 0.3mm or more tact and the monitor Drawing Adjust lever Contact Motor PCB Touching 4 – 4 Adjustment method Confirm followings. Make sure that the gap between the con- tact and the motor PCB is 0.3 mm or more.
  • Page 88 Item Specification 4–2 between 1 0.5 platen and the paper Rear Platen 4–3 between platen and the pressure roller Platen Front pressure roller Drawing Change lever Change lever (Center friction) Rear Paper pan Pressure roller 4 – 5 Adjustment method Confirm followings.
  • Page 89 Item Specification 4–4–1 Rotation of the push tractor Change lever (Center friction) 4–4–2 Backlash between Approx. 0.05 to gears 0.11 mm Drawing Push tractor Tractor gear Slight backlash 4 – 6 Adjustment method To confirm: The tractor gear shall rotate smoothly when the change lever is set at Friction posi- tion.
  • Page 90 Item Specification 4–5–1 Ribbon feed 4–5–2 Running load to spac- 250g or less ing mechanism without a rib- bon cartridge Drawing Ribbon feeding Load measurement portion Ribbon cartridge 4 – 7 Adjustment method To confirm: Ribbon shall be fed smoothly when the carriage is moved from side to side.
  • Page 91 Item Specification 4–6 Engagement of the double gear and the LF motor idle gear of the Platen Assy. Tension Drawing LF Motor Platen gear (L) idle gear Bias gear Good 4 – 8 Adjustment method To confirm: The idle gear of the LF motor and the platen gear (L) and the bias gear of the...

  • Page 92: Cleaning And Lubrication

    5. CLEANING AND LUBRICATION...
  • Page 93 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 94 Carriage shaft 5 – 2...

  • Page 95: Lubrication

    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 96 Lubrication point Ribbon feed gear Assy. Planetary gear shaft (upper and lower) EM-30L-A Idle gear shaft (upper and lower) PM-B (0.006 0.002g) Space rack Rack upper side Drive gear shaft (upper and lower) PM-B (0.006 0.002g) Space rack Approx. 35 (greasing range) EM-30L-A 5 –...
  • Page 97 Platen Assy. Bias gear Contact face of platen shaft and platen FG spring EM-30-L-B Grease the contact face of platen gear (L) and bias gear PM-B Platen gear (L) 5 – 5...
  • Page 98 Tractor driving mechanism Sliding surface of change arm and change lever EM-30L-A Change arm Idle gear teeth EM-30L-A Reset spring Gear bearing portion EM-30L-A Sliding surface of reset spring and gear EM-30L-A Tractor drive shaft Sliding surface of FG spring and drive shaft end EM-30L-A 1 2 3 4 5 1 2 3 4 5...
  • Page 99 Pressure roller Change arm Support spring Contact portion of support spring and shaft EM-30L-A Contact portion of rear holder and shaft EM-30L-A Sliding portion of release shaft and rear roller holder EM-30L-A Release shaft protruding portion - 2 portions EM-30L-A Shaft Rear roller holder Sliding portion of release...
  • Page 100 Pull up roller Assy. Pull-up roller frame Pull-up roller shaft All bearing portions of pull-up roller shaft and pull-up roller frame EM-30L-B Gear and post EM-30L-A 5 – 8...
  • Page 101 Main chassis Assy. Grease portion (N: 3 portions, W: 5 portions) rear side EM-30L-A Grease portion Grease portion at rib (N: 9 portions W: 13 portions) EM-30L-A 5 – 9 Models ML3320 ML3321...
  • Page 102 Carriage Assy. NK2-10-SUS Bearing portion of guide roller EM-30L-B 5 – 10...

  • Page 103: Troubleshooting And Repair

    6. TROUBLESHOOTING AND REPAIR...

  • Page 104: Items To Check Before Repair

    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 105: Lamp Display

    : LED is kept in Current Condition (no change) Fault alram display When the printer detects any of the various alarm states, the information is displayed as shown below on the operation panel. The alarm is specified by lamp combination of PRINT QUALITY and CHARACTER PITCH.
  • Page 106 6 – 3...
  • Page 107 6 – 4...
  • Page 108 6 – 5...

  • Page 109: Connection Circuit Check For Printhead And Sp/Lf Motor

    Connection Circuit Check for Printhead and SP/LF Motor Printhead Signal HEAD1 HEAD2 HEAD4 HEAD6 HEAD8 HTEMP +40V +40V +40V HEAD9 HEAD7 HEAD5 HEAD3 Connector pin number Thermistor 6 – 6...
  • Page 110 Line Feed Motor Resistance of each coil should be about 7.6 . Signal Connector pin number 6 – 7 motor...
  • Page 111 Space Motor Resistance of each coil should be about 5 . Signal SP-U SP-V SP-W Connector pin number Motor øA øB 6 – 8...

  • Page 112: Troubleshooting Flow Chart

    Troubleshooting flow chart Power is not supplied. Is the AC cable connected correctly? Connect the AC cable correctly. Is fuse F1 on the transformer assy/or F1 on the control/power supply board blown? Replace fuse (with same type and rating). Remedied? Does DC + 8V out? Remove Printhead.
  • Page 113 No Yes Replace Driver board. Replace Transformer assy. Remedied? No Yes Replace Control/Power supply board. Driver Board 20••••••••••••1 Pin No. 19 18 17 16 15 14 13 10 Signal +40V (F.G) 6 – 10 (0V)

  • Page 114: No Spacing Operation

    No spacing operation Is carriage assembly binding or jammed? Check around space motor to repair the mechanism of space rack, back up roller, ribbon feed mechanism, and carriage frame etc. Replace Space motor assy. Remedied? Replace Driver board. Remedied? Replace Carriage cable. (The alarm LED Blinks) 6 –...

  • Page 115: Homing Does Not End Normally

    Homing does not end normally Check around space motor to repair the mechanism. (Space rack, ribbon feed assembly back up roller, carriage frame, support protector and ribbon protector.) Remedied? Replace Space motor assy. Replace Space motor assy. Remedied? Replace Carriage cable. Remedied? Replace Driver board.

  • Page 116: Paper Jam While Paper Insertion

    Paper jam while paper insertion Jam 1 Check the ribbon protector. Check the pull up roller cover is closed properly. Pull up roller cover Ribon Protector Jam 2 (wrinkled paper) Check around pressure roller mechanism. • Front pressure springs are narrow: 3 pcs; wide: 5 pcs) mounted properly or not. •...

  • Page 117: Smearing/Missing Dots

    Smearing/missing dots Does ALARM LED blink and display alarm? See Tables 6.2 and 6.3 for troubleshooting information. Replace Printhead. Remedied? Replace Driver board. Remedied? Replace Carriage cable or Space motor assy. 6 – 14...

  • Page 118: Faint Or Dark Print

    Faint or dark print Is the print head gap set properly? Adjust the printhead gap (see section 5). Remedied? Replace Printhead. Remedied? Replace Driver board. Remedied? Replace Ribbon feed mechanism. 6 – 15...

  • Page 119: Ribbon Feed Trouble

    Ribbon feed trouble Remove the ribbon cartridge. Move carriage to left and right. Does the ribbon drive shaft rotate? Change Ribbon cartridge. Remove Ribbon feed mechanism. Move carriage to left and right. Does the ribbon drive shaft rotate? Replace Ribbon feed mechanism. Replace Space motor assy.

  • Page 120: Line Feed Trouble

    Line feed trouble Turn the power off, and rotate the platen manually. Does the platen rotate smoothly? Is the platen gear (L) broken? Replace Platen assembly. Is the LF motor idle gear broken? Replace the LF motor assembly or LF idle gear. Is the platen gear (R), idle gear or change gear broken? Replace the gear.

  • Page 121: Malfunction Of Switch On Operation Panel

    Malfunction of switch on operation panel Is the CN1 of Operation panel connected to the CN3 on the driver board? Connect the cable properly. Replace Operation panel board. Remedied? Replace Driver board. 6 – 18...
  • Page 122 Data receiving failure Is the SEL LED blinking? Printer went into the print suppress mode. Wait until printer to receives DC1 code, or change the menu item “Print suppress-Ineffective” when the function is not required. Is the I/F RS232C? To step...
  • Page 123 Is + 8V supplied on Driver board? Yes No Remove RS232C I/F Board. Is the + 8V supplied on the Driver board? Replace RS232C I/F board. Replace Driver board. Printer I/F pin assignment. 2 pin, 3 pin, 11 pin, 20 pin, 6 pin.
  • Page 124 Replace RS232C board. Remedied? Replace Driver board. 6 – 21...
  • Page 125 APPENDIX A...
  • Page 126 APPENDIX A BIT IMAGE GRAPH IS — DOT DENSITY Single Double 1/60 inch DOT 1/120 inch DOT D = 1/60 inch Double speed double density 1/120 inch DOT (No adjacent dots allowed) APPENDIX A – 1 Double speed quad density 1/144 inch 1/240 inch DOT...

  • Page 127: Pcb Layout

    PCB LAYOUT PCB list Circuit board SDCT (Control/Power Supply) Circuit board SDDV (Driver) Circuit board LEOP-3 (Operation Panel) A – 1...
  • Page 128 APPENDIX B...

  • Page 129: Spare Parts List

    SPARE PARTS LIST Quantity per year: Indicates the recommended number of each part that should be ordered for routine maintenance for one year for 500 units of printers and assuming that the printers are operated for 2 hours/day of 600 hours/year. The following codes are used to indicate the number of printers for which maintenance parts are ordered.
  • Page 130 Figure 11-1 Upper Cover Assy B – 2...
  • Page 131 Figure 11-1 Upper Cover Assy Part No. 1PP4128-1186P6 Upper cover (N) 1PP4128-1186P4 Upper cover (N) 1PP4128-1186P2 Upper cover (N) 1PP4128-1231P6 Upper cover (W) 1PP4128-1231P4 Upper cover (W) 1PP4128-1231P2 Upper cover (W) 1PA4094-7305G10 Sheet guide assy (N) 1PA4094-7308G11 Sheet guide assy (W) 2PA4128-1237G1 Access cover assy (N) 2PA4128-1241G1...
  • Page 132 Figure 11-2 Printer General Assy B – 4...
  • Page 133 Transformer assy (ML320 Turbo 230/240V) 4YB4049-7103P2 Transformer assy (ML321 Turbo 120V) 4YB4049-7104P2 Transformer assy (ML321 Turbo 230/240V) 3PB4050-3429P2 PCB plate Figure 11-2 Printer General Assy Description Q'ty Required B – 5 Q'ty Remarks For ODA For OEL For INT For ODA...
  • Page 134 Figure 11-3 Printer Unit B – 6...
  • Page 135 Figure 11-3 Printer Unit Part No. 3PA4044-5002G2 Main chassis assy (N) 3PA4044-5152G2 Main chassis assy (W) 3PP4044-5012P1 Bottom paper end lever 4PP4044-5019P2 Pressure spring (F) 4PP4044-5019P1 Pressure spring (F) 4PP4044-5031P2 Roller holder (F) 4PA4025-3327G1 Front pressure roller 3PP4044-5015P1 Release shaft (N)
  • Page 136 Part No. 3PA4044-5025G2 Platen assy (N) 3PA4044-5159G2 Platen assy (W) 3PP4044-5010P1 Space rack gear (N) 3PP4044-5156P1 Space rack gear (W) 4PB4025-3377P2 Tension spring for space rack 3PP4044-5008P1 Guide rail plate (N) 3PP4044-5155P1 Guide rail plate (W) 3PP4025-2810P2 Adjust cam 4PP4044-5009P1 Carriage shaft 4PP4044-5009P2 Carriage shaft...
  • Page 137 Figure 11-4 Carriage Assy B – 9...
  • Page 138 Figure 11-4 Carriage Option Assy Part No. 4PP4044-5061G1 Carriage frame set 4PA4025-3718G1 Back up roller holder assy 4PP4025-3398P1 Guide roller 3PP4044-5065P1 Guide roller holder 4YA4044-5100G1 Space motor assy 3PB4044-5506P1 Head cable (9N) 3PB4044-5507P1 Head cable (9W) 3PB4044-5125P1 15-pin connector 3PA4044-5070G1 Gear cace assy 3PP4044-5068P1 Head clamp...
  • Page 139 [Pull-Tractor] [Bottom-Tractor] [I/F Board] Figure 11-5 Option Spare Parts B – 11...
  • Page 140 Figure 11-5 Option Spare Parts Part No. 4PA4025-3608G1 Pull and bottom tractor assy (L) 4PA4025-3603G1 Pull and bottom tractor assy (R) 2PP4128-1239G1 Tractor cover assy (N) 2PP4128-1243G1 Tractor cover assy (W) 1PA4128-1277G1 Bottom push stand (L) 1PA4128-1277G2 Bottom push stand (R) 4PP4094-7385G1 Paper knife (N) 4PP4094-7386G1...

  • Page 141: Rs-232C Serial Interface Board (Option)

    APPENDIX C RS-232C Serial Interface Board (Option)
  • Page 142 APPENDIX C RS-232C SERIAL INTERFACE BOARD GENERAL This section describes the operation of the RS-232C Serial Interface board installed in the Printer as an option using a start-stop synchronization and serial communications circuit. This serial interface board is capable of transmitting and receiving simultaneously at speeds up to 19,200 bits per second.

  • Page 143: Operation Description

    80C51 with MASK ROM An eight-bit microprocessor controller that controls the following: (a.) Serial interface protocol and data transfer through a serial port. (b.) Message buffer. (c.) Transmission of parallel data to the printer. SN75189 An RS-232C standard line receiver SN75188 An RS-232C standard line driver.
  • Page 144 80C51 IF WR DB0 to DB9 LS245 +5 VD ±9 V power 10 VAC supply circuit +5 V Figure C-2-1 Block Diagram ADR latch 2764 8 KB 8 KB +9 V –9 V C – 3 Serial data control line Bus line Control line...
  • Page 145 2.2.1 Operation at power on After power is turned on, an RST OUT signal is sent from the printer control board to reset the printer. When the reset is canceled, the 80C51 CPU performs initialization. Initialization consists of setting the 80C51 timer, and setting the serial mode.

  • Page 146: Communication Procedure Flowchart

    Is DSR valid? Buffer overflow? Error? No error Store the received character in buffer. Is the printer in DESELECT state or is the paper low? Is remaining buffer space < 256? Has 200 ms or 1s elapsed after SSD was turned on? Turn off the SSD signal.
  • Page 147 DC3 is turned on or has 1 second elapsed? Ready to send? Send DC1. Printer busy? Output one character to printer. Figure C-2-3 C – 6 DSR High? Store 40 H in buffer. Is remaining buffer space > 256 during...

  • Page 148: Troubleshooting Flowchart

    Before servicing the printer, ask the customer in what situation the trouble occurred and record the response. Before starting troubleshooting, operate the printer in the same situation as that at the time of trouble occurrence to see if the same trouble occurs again. If not, perform the printers self test and thoroughly test the printers functionality.
  • Page 149 The data is not received using a serial interface. (A protocol is set to READY/BUSY state, and BUSY LINE is in SSD + state.) Is the OSC oscillation waveform as specified in Figure C-3-1? Replace the OSC. Yes Is a RST signal in Q3 is as specified in Figure C-3-2? Check the RST circuit on the SDCT board.
  • Page 150 Yes Are ALE, PSEN, RD, WR, signals as specified in Figure C-3-3? 180ns PSEN 271ns RD/WR Replace the Q3. Yes Are (T1) SELECT and (INTO) BUSY signals low level? Check Q501 on the SDDV board. Yes Are +9V and -9V input to Q1? Replace defective component in +9/–9 volt control circuit.
  • Page 151 In receiving by serial interface, printing data is omitted or printing operation is not performed. Are RxD and SSD of Q3 as specified in Figure C-3-4? Replace the Q2. Yes Are, WR, and BUS signals of Q3 pin 3 as specified in Figure C-3-5? 542ns Q3-3 Replace the Q3.

  • Page 152: Local Test

    It then prints characters. To start and stop this test, push the SEL switch on the front of the printer. Details of this test are explained on the next page.
  • Page 153 The program revision using two numerical characters is printed. “LOOP TEST” is printed. Memory is checked for the message buffer. Prints “OK” is printed if the memory check is OK and “BAD” is printed if the memory check fails. Output level to DTR, RTS, and SSD signals is dropped low. If DSR, CTS, or CD signals is High, “IF BAD”...
  • Page 154 APPENDIX D CSF (Option)
  • Page 155 Oki Systems (Danmark) a.s. Oki Systems (Deutschland) GmbH Park Alle 382 Hansaallee 187 DK-2625 Vallensbaek 40549 Dusseldorf Denmark Germany Tel : 436 66500 Tel : 0211 5266-0 Fax : 436 66590 Fax : 0211 593345 Oki Systems (France) S.A. Oki Systems (Holland) b.v.

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