Oki MICROLINE 320 Turbo Maintenance Manual
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Oki MICROLINE 320 Turbo Maintenance Manual

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See also: Handbook , User Manual
No.01
MICROLINE 320/321 Turbo PRINTER
MICROLINE 3320/3321 PRINTER(OEL)
(ODA/OEL/INT/RUSSIA/HASAR/ADP/BANAMEX)
Related drawings
Drawing No.
42089201TL
42089201TR
BOM
Use for
Rev
Date
DCO No.
2
2006-11-01
SW4-0462
3
2007-03-30
SW4-0551
4
2009-02-17
SG2-0028
Approval
Yukio Okawara
.....................................................................................................
Check
Minoru Kanno
.....................................................................................................
Date
2002-03-28

Maintenance Manual

[Rev. 4]
ML320/321Turbo ML3320/3321(OEL) Disassembly for Maintenance
ML320/321Turbo ML3320/3321(OEL) RSPL
Contents
Change for RoHS
Change for Energy Star
Addition of "Warning", etc.
Design
Minoru Kanno
Oki Data CONFIDENTIAL
Name
Certification Body
Design
Minoru Kanno
Minoru Kanno
Tomoyo Sugiyama
Name
ML320/321Turbo
ML3320/3321(OEL)
Maintenance Manual
Drawing No.
42089201TH
Approval
Minoru Kanno
Minoru Kanno
Yoshinori Fujisawa
1
123

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  • Page 1: Maintenance Manual

    Oki Data CONFIDENTIAL No.01 MICROLINE 320/321 Turbo PRINTER MICROLINE 3320/3321 PRINTER(OEL) Maintenance Manual (ODA/OEL/INT/RUSSIA/HASAR/ADP/BANAMEX) [Rev. 4] Related drawings Drawing No. Name 42089201TL ML320/321Turbo ML3320/3321(OEL) Disassembly for Maintenance 42089201TR ML320/321Turbo ML3320/3321(OEL) RSPL Use for Certification Body Date DCO No. Contents Design...
  • Page 2 Oki Data CONFIDENTIAL Document Revision History Corrected items Person in Rev.No. Date change Page Description of change 2002-03-28 ISSUE 2006-11-01 For RoHS ODS M.Kanno 2007-03-30 For Energy Star ODS M.Kanno 2009-02-17 50, 69 Addition of “Warning”, EP5 T. Sugiyama etc.
  • Page 3 Oki Data CONFIDENTIAL PREFACE This maintenance manual describes how to maintain the Microline 320/321Turbo,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. The relation between the destination point and the model name of this printer is as follows.

  • Page 4: Table Of Contents

    Oki Data CONFIDENTIAL CONTENTS CONFIGURATION ...................6 1.1. Standard Printer Configuration ..................6 Options .......................... 7 THEORY OF OPERATION ................9 Electrical Operation ....................... 9 2.1.1 Summary ......................9 2.1.2 Microprocessor and the Peripheral Circuit ............. 9 2.1.3 Initialization ..................... 15 2.1.4 Parallel Interface Control ................
  • Page 5 Oki Data CONFIDENTIAL 3.3.21 Rear Pressure Assy ..................75 3.3.22 Switch Lever ....................76 ADJUSTMENT ....................77 CLEANING AND LUBRICATION ..............85 Cleaning ........................85 Lubrication ........................86 TROUBLESHOOTING AND REPAIR ............94 Items to Check Before Repair ................... 94 Troubleshooting Table ....................94 Lamp Display ......................

  • Page 6: Configuration

    Oki Data CONFIDENTIAL CONFIGURATION 1.1. Standard Printer Configuration This printer consists of the following assemblies: Sheet guide assy Platen knob Access cover connector cover assy (at USB Ver.) Upper cover Traansformer assy Pull-up roller assy Control/Power supply assy Driver board...

  • Page 7: Options

    Oki Data CONFIDENTIAL Options Cut sheet feeder unit (CSF) (Narrow and wide versions available) Dual-bin CSF Single-bin CSF Attachment assy Pull-tractor assy 42089201TH Rev.4...
  • Page 8 Oki Data CONFIDENTIAL Bottom push tractor unit Roll paper stand (Narrow only) Option I/F Board • RS232C • RS422A • Current Loop • NIC (Network version only) 42089201TH Rev.4...

  • Page 9: Theory Of Operation

    Microprocessor (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 4M bit program memory and 128K bytes of data memory.
  • Page 10 Oki Data CONFIDENTIAL 10 / 42089201TH Rev.4...
  • Page 11 Oki Data CONFIDENTIAL Program ROM This is a 256K/512K/1024K × 16 bits (4/8/16M bit) MASK ROM or FLASH ROM 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 12 Oki Data CONFIDENTIAL The RAM is CMOS dynamic RAM with 256K × 16bits (4Mbit), and used as buffers (such as receiving buffer, printing buffer, DLL buffer and working buffer). The following shows the examples of the memory access operation. A0~A7...
  • Page 13 Oki Data CONFIDENTIAL 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. EEPROM EEDIN-P EECS-P EEDOUT-P EECLK-P...
  • Page 14 Oki Data CONFIDENTIAL 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.

  • Page 15: Initialization

    Oki Data CONFIDENTIAL 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 initializing operation, the RST-N signal is first output from the reset circuit to reset the MPUs and LSIs.

  • Page 16: Parallel Interface Control

    Oki Data CONFIDENTIAL 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 17: Universal Serial Bus (Usb) (At Usb Ver.)

    Oki Data CONFIDENTIAL 2.1.5 Universal Serial Bus (USB) (at USB Ver.) Universal Serial Bus Specification Revision 1.0 compliance. Connector • Printer Side : “B” Receptacle (Upstream Input to the USB Device) • Cable Side : Series “B” Plug Cable • Cable Length : Approx 1.8m (A cable must be met USB Spec Rev 1.1 for normal...
  • Page 18 Oki Data CONFIDENTIAL Signal Level • Input / Output Level Parameter Symbol Min. Max. Units Input Levels : High (driven) High (floating) Output Levels : High (driven) Output Signal Crossover Voltage 18 / 42089201TH Rev.4...

  • Page 19: Print Control

    Oki Data CONFIDENTIAL 2.1.6 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 Driver Board A/D bus DRIVER Print Head Print Data Print Data...
  • Page 20 Oki Data CONFIDENTIAL Print Compensation Control The print compensation can be made as shown below: Voltage compensation (See 2.1.8 “Alarm Circuit.”) Temperature compensation (See 2.1.8 “Alarm Circuit.”) Pin stroke compensation Platen Print Head Pin 1, 2 As shown in the drawing left, the stroke length up to the platen is different for each pin.

  • Page 21: Sp/Lf Motor Control

    Oki Data CONFIDENTIAL 2.1.7 SP/LF Motor Control Space motor control The SP motor driver (ECN30105) 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 Oki Data CONFIDENTIAL 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.

  • Page 23: Operation Panel

    Oki Data CONFIDENTIAL 2.1.8 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: BU6152S). OPTXD OPTD OPCLK OPCK Command LED driver and Data...
  • Page 24 Oki Data CONFIDENTIAL 24 / 42089201TH Rev.4...

  • Page 25: Alarm Circuit

    Oki Data CONFIDENTIAL 2.1.9 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 26 Oki Data CONFIDENTIAL 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...

  • Page 27: Power Supply Circuit

    Oki Data CONFIDENTIAL 2.1.10 Power Supply Circuit This power supply circuit supplies the +5VDC, +8VDC, +40VDC, 10VAC. Control Board Noise Rectifier +40V filter Fuse circuit Trans- former Rectifier Regulation Circuit AC10V The uses of output voltages and signals are described below.

  • Page 28: Mechanical Operation

    Oki Data CONFIDENTIAL 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 29 Oki Data CONFIDENTIAL Operation of printhead (See Figure 2-3.) 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.
  • Page 30 Oki Data CONFIDENTIAL Paper Printhead Print wire Platen When printing Paper Armature assembly Thermistor Print wire Wire guide Yoke Spacer Magnet assembly When not printing Paper Figure 2-3 30 / 42089201TH Rev.4...

  • Page 31: Spacing Operation (See Figure 2-4.)

    Oki Data CONFIDENTIAL 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 32: Head Gap Adjusting (See Figure 2-5.)

    Oki Data CONFIDENTIAL 2.2.3 Head Gap Adjusting (See Figure 2-5.) The head gap adjusting lever moves back and forth to tilt the carriage frame, altering the gap between the printhead and the platen. The adjusting screw, which is connected to the adjusting gear rotates when the adjusting lever is moved creating a fine gap adjustment.
  • Page 33 Oki Data CONFIDENTIAL Platen Range Carriage shaft Printhead Adjusting lever Adjusting screw Idler gear Adjusting gear Range from Narrows Printhead Adjusting screw Adjusting cam C.C.W. Platen Guide rail Widens Range from C.W. Figure 2-5 33 / 42089201TH Rev.4...

  • Page 34: Ribbon Drive (See Figure 2-6.)

    Oki Data CONFIDENTIAL 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: Ribbon drive gear assembly Ribbon gear (space motor)

  • Page 35: Paper Feed Operation

    Oki Data CONFIDENTIAL 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...
  • Page 36 Oki Data CONFIDENTIAL 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 37 Oki Data CONFIDENTIAL 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)
  • Page 38 Oki Data CONFIDENTIAL 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.
  • Page 39 Oki Data CONFIDENTIAL 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 40 Oki Data CONFIDENTIAL 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.
  • Page 41 Oki Data CONFIDENTIAL 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 42 Oki Data CONFIDENTIAL 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 43 Oki Data CONFIDENTIAL 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 44 Oki Data CONFIDENTIAL Change lever Release cam Platen Front release gear arm BOTTOM REAR Figure 2-14 44 / 42089201TH Rev.4...

  • Page 45: Paper Detection Mechanism (See Figure 2-15.)

    Oki Data CONFIDENTIAL 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 46 Oki Data CONFIDENTIAL 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 47: Automatic Sheet Feed

    Oki Data CONFIDENTIAL 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.
  • Page 48 Oki Data CONFIDENTIAL When using the continouos paper Set the change lever either to the rear side or the bottom side position. (See Figure 2-17.) Set a sheet of paper either to the push tractor or the bottom tractor. Press the “FF/LOAD” switch.

  • Page 49: Paper Park Function (Continuous Paper)

    Oki Data CONFIDENTIAL 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 50: 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.

  • Page 51: 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. 1-100 Phillips Screws screwdriver 2.6 mm No. 2-200 Phillips...

  • Page 52: 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] CSF connector cover(at USB Ver.) Upper cover assy Transformer assy Control/Power Printhead supply board (at USB Ver.) Driver board (at USB Ver.)
  • Page 53 Oki Data CONFIDENTIAL [How to Change Parts] This section explains how to change parts and assemblies appearing in the disassembly diagram below. 3.3.1 Printhead Printer unit 3.3.2 Ribbon protector 3.3.3 Pull-up roller assy 3.3.4 Upper cover, access cover and sheet guide 3.3.5...

  • Page 54: Printhead

    Oki Data CONFIDENTIAL 3.3.1 Printhead Open the access over. Pull up and rotate the head clamp to unclamp the printhead as shown fig. 3.3.1. Disconnect the printhead from PC connector To install, follow the removal steps in the reverse order.

  • Page 55: Ribbon Protector

    Oki Data CONFIDENTIAL 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. 55 / 42089201TH Rev.4...

  • Page 56: Pull-Up Roller Assy

    Oki Data CONFIDENTIAL 3.3.3 Pull-up Roller Assy Open the access cover Lift up the sheet guide Assy to remove. Tilting the pull-up roller Assy toward the front, remove from the shaft of platen Assy To install, follow the removal steps in the reverse order.

  • Page 57: 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 Turn the change lever toward the bottom position. Insert a flat-blade screwdriver into grooves (5 places) (4 places for narrow type) of frame...

  • Page 58: Gear Case Assy

    Oki Data CONFIDENTIAL 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 , then the space motor Disconnect a carriage cable.

  • Page 59: Pc Connector

    Oki Data CONFIDENTIAL 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 from the space motor Assy To install, follow the removal steps in the reverse order.

  • Page 60: Space Motor, Guide Roller Assy

    Oki Data CONFIDENTIAL 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 from the space motor To install, follow the removal steps in the reverse order.

  • Page 61: Space Rack

    Oki Data CONFIDENTIAL 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...

  • Page 62: Carriage Cable

    Oki Data CONFIDENTIAL 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...

  • Page 63: Backup Roller Holder Assy

    Oki Data CONFIDENTIAL 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...

  • Page 64: Platen Assy

    Oki Data CONFIDENTIAL 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 to the bottom position.

  • Page 65: 1Driver Board (Dve/Dvf) (At Usb Ver.)

    Oki Data CONFIDENTIAL 3.3.12.1 Driver Board (DVE/DVF) (at USB Ver.) Remove the upper cover (see 3.3.4 (1) – (5)). Remove two screws and remove two screws , and release the driver board Plate I/F by lifting clamp Disconnect all cables from driver board To install, follow the removal steps in the reverse order.

  • Page 66: 2Driver Board (Sdf) (At Non Usb Ver.)

    Oki Data CONFIDENTIAL 3.3.12.2 Driver Board (SDF) (at non USB Ver.) Remove the upper cover (see 3.3.4 (1) – (5)). Remove two screws 1, and release the driver board 2 and PCB sheet 5 by lifting clamp Disconnect all cables from driver board 2.

  • Page 67: Lf Motor

    Oki Data CONFIDENTIAL 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).

  • Page 68: Operation Panel Pcb (Leop)

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

  • Page 69: Control/Power Supply Board (Aoe/Aou/Aoo)

    Oki Data CONFIDENTIAL 3.3.15 Control/Power Supply Board (AOE/AOU/AOO) Risk of Electric Shock There is a risk of electric shock during replacement of the power supply. Use insulating gloves or avoid direct contact with any conducting part of the power supply, and caution should be exercised during replacement.

  • Page 70: Transformer Assy

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

  • Page 71: Change Lever And Gears

    Oki Data CONFIDENTIAL 3.3.17 Change Lever and Gears Remove the upper cover (see 3.3.4 (1) – (5)). Remove the reset spring , then remove the idle gear , the tractor gear and the change gear Push back the protrusion of the Change Gear Shaft...

  • Page 72: Carriage Shaft

    Oki Data CONFIDENTIAL 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 the left side (in the direction of the arrow) to remove.

  • Page 73: Paper Pan

    Oki Data CONFIDENTIAL 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).

  • Page 74: Rear Tractor Assy

    Oki Data CONFIDENTIAL 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))

  • Page 75: Rear Pressure Assy

    Oki Data CONFIDENTIAL 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 and move it to the left to detach the release shaft Match the Main Frame Rib A with the protrusion B of the Release Shaft.

  • Page 76: Switch Lever

    Oki Data CONFIDENTIAL 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.

  • Page 77: 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.
  • Page 78 Oki Data CONFIDENTIAL Item Specification Drawing Adjustment method 4–1–1 Gap between the plat- It shall be measured en and the print head at 3 points: the left end, the center and 1) Parallelism the right end of the justment Variation of platen.
  • Page 79 Oki Data CONFIDENTIAL Item Specification Drawing Adjustment method Note 1) The head gap shall be measured with the Adjust lever change lever set to rear position. Note 2) The head gap shall be measured positioning Adjust gear the platen gear (R) craw on the top.
  • Page 80 Oki Data CONFIDENTIAL Item Specification Drawing Adjustment method Gap between the con- 0.3mm or more Confirm followings. tact and the monitor Make sure that the Adjust lever gap between the con- tact and the motor PCB is 0.3 mm or more.
  • Page 81 Oki Data CONFIDENTIAL Item Specification Drawing Adjustment method 4–2 between 1±0.5 Confirm followings. platen and the paper (1) When the change lever is set at Friction position, the gap between Change lever the platen and the paper pan at the...
  • Page 82 Oki Data CONFIDENTIAL Item Specification Drawing Adjustment method 4–4–1 Rotation of the push To confirm: tractor The tractor gear shall rotate smoothly when the change lever is set at Friction posi- tion. Change lever (Center friction) Push tractor Tractor gear Slight backlash 4–4–2...
  • Page 83 Oki Data CONFIDENTIAL Item Specification Drawing Adjustment method 4–5–1 Ribbon feed To confirm: Ribbon shall be fed smoothly when the carriage is moved from side to side. Ribbon feeding 4–5–2 Running load to spac- 250g or less To confirm: Ribbon...
  • Page 84 Oki Data CONFIDENTIAL Item Specification Drawing Adjustment method 4–6 Engagement of the To confirm: double gear and the LF The idle gear of the motor idle gear of the LF motor and the LF Motor Platen gear (L) Platen Assy.

  • Page 85: 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 86: 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 87 Oki Data CONFIDENTIAL Lubrication point Ribbon feed gear Assy. Drive gear shaft (upper and lower) Planetary gear shaft PM-B (0.006±0.002g) (upper and lower) EM-30L-A Idle gear shaft (upper and lower) PM-B (0.006±0.002g) Space rack Space rack Rack upper side Approx. 35 (greasing range)
  • Page 88 Oki Data CONFIDENTIAL Platen Assy. Contact face of platen shaft and platen FG spring EM-30-L-B Bias gear Grease the contact face of platen gear (L) and bias gear PM-B Platen gear (L) 88 / 42089201TH Rev.4...
  • Page 89 Oki Data CONFIDENTIAL Tractor driving mechanism Change lever Sliding surface of change arm and Tractor gear bearing portion change lever EM-30L-A EM-30L-A Change arm Idle gear teeth EM-30L-A Reset spring Gear bearing portion EM-30L-A Sliding surface of change Sliding surface of...
  • Page 90 Oki Data CONFIDENTIAL Pressure roller Sliding portion of release Change arm shaft and change arm EM-30L-A Release shaft Support spring Contact portion of support Front pressure roller spring and shaft EM-30L-A Contact portion of rear holder and shaft EM-30L-A Controller holder...
  • Page 91 Oki Data CONFIDENTIAL 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 91 / 42089201TH Rev.4...
  • Page 92 Oki Data CONFIDENTIAL Main chassis Assy. Grease portion (N: 3 portions, W: 5 portions) rear side EM-30L-A Models Destination apoint ML3320 ML320Turbo Other ML3321 ML321Turbo Other Grease portion at rib (N: 9 portions W: 13 portions) EM-30L-A Grease portion 92 /...
  • Page 93 Oki Data CONFIDENTIAL Carriage Assy. NK2-10-SUS Bearing portion of guide roller EM-30L-B 93 / 42089201TH Rev.4...

  • Page 94: 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.

  • Page 95: Lamp Display

    Oki Data CONFIDENTIAL Lamp Display Printer mode display Table 6.2 LED CONDITION ALARM TROUBLE ALARM CONTENTS CATEGORY SHOOTING ALARM MENU 10CPI 15CPI From, cut sheet or bottom Paper end alarm Set New paper. paper end • Set the lever to specified...
  • Page 96 Oki Data CONFIDENTIAL 96 / 42089201TH Rev.4...
  • Page 97 Oki Data CONFIDENTIAL 97 / 42089201TH Rev.4...
  • Page 98 Oki Data CONFIDENTIAL 98 / 42089201TH Rev.4...

  • Page 99: Connection Circuit Check For Printhead And Sp/Lf Motor

    Oki Data CONFIDENTIAL Connection Circuit Check for Printhead and SP/LF Motor Printhead Signal Connector pin number HEAD1 HEAD2 HEAD4 HEAD6 HEAD8 Thermistor HTEMP +40V +40V +40V HEAD9 HEAD7 HEAD5 HEAD3 99 / 42089201TH Rev.4...
  • Page 100 Oki Data CONFIDENTIAL Line Feed Motor Resistance of each coil should be about 10.4Ω. Signal Connector pin number motor Space Motor Resistance of each coil should be about 18.4Ω. Signal Connector pin number SP-U SP-V Motor SP-W φA φB 200Ω...

  • Page 101: Troubleshooting Flow Chart

    Oki Data CONFIDENTIAL 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).
  • Page 102 Oki Data CONFIDENTIAL No Yes Replace Driver board. Driver Board Replace Transformer assy. Remedied? No Yes •••••••••••••••••••••• Replace Control/Power supply board. Pin No. 19 18 17 16 15 14 13 10 Signal +40V (F.G) (0V) 102 / 42089201TH Rev.4...
  • Page 103 Oki Data CONFIDENTIAL No spacing operation (The alarm LED Blinks) 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.
  • Page 104 Oki Data CONFIDENTIAL 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.
  • Page 105 Oki Data CONFIDENTIAL Paper jam while paper insertion Jam 1 Check the ribbon protector. Check the pull up roller cover is closed properly. Pull up roller cover Platen Paper Ribon Protector Jam 2 (wrinkled paper) Check around pressure roller mechanism.
  • Page 106 Oki Data CONFIDENTIAL 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. 106 / 42089201TH Rev.4...
  • Page 107 Oki Data CONFIDENTIAL 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. 107 / 42089201TH Rev.4...
  • Page 108 Oki Data CONFIDENTIAL 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.
  • Page 109 Oki Data CONFIDENTIAL 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.
  • Page 110 Oki Data CONFIDENTIAL 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. 110 / 42089201TH Rev.4...
  • Page 111 Oki Data CONFIDENTIAL 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?
  • Page 112 Oki Data CONFIDENTIAL 10-2 (RS232C I/F) Printer I/F pin assignment. Is the correct cable used? 2 pin, 3 pin, 11 pin, 20 pin, Change I/F cable. 6 pin. Is ALARM LED blinking? See tables 6.2 and 6.3 for the troubleshooting.

  • Page 113: Appendix A Pcb Layout

    Oki Data CONFIDENTIAL APPENDIX A PCB LAYOUT PCB list Circuit board AOE/AOU/AOO (Control/Power Supply) Circuit board DVE/DVF or SDF (Driver) Circuit board LEOP (Operation Panel) Control/Power Supply Board (AOE/AOU/AOO) (AOE) Short Plug Setting Destination Point NOMOUNT 1 - 2: Normal...
  • Page 114 Oki Data CONFIDENTIAL Driver Board (DVE/DVF or SDF) (DVE/DVF) Driver Board (SDF) Operation Panel Board (LEOP) 114 / 42089201TH Rev.4...

  • Page 115: Appendix B Rs-232C Serial Interface Board (Option)

    Oki Data CONFIDENTIAL APPENDIX B RS-232C SERIAL INTERFACE BOARD (OPTION) 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 116 Oki Data CONFIDENTIAL 80C51 ADR latch IF WR 2764 DB0 to DB9 LS245 8 KB 8 KB Serial data control line +5 VD ±9 V power +9 V 10 VAC Bus line supply circuit -9 V +5 V Control line...
  • Page 117 Oki Data CONFIDENTIAL 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 118: Communication Procedure Flowchart

    Oki Data CONFIDENTIAL Communication Procedure Flowchart 2.3.1 Mode a Ready/Busy Received one character? Is DSR valid? DSR High? Buffer overflow? Parity error Error? No error Store the received Store 40 H in buffer. character in buffer. Is the printer in DESELECT...
  • Page 119 Oki Data CONFIDENTIAL 2.3.2 Mode b X-ON, X-OFF Received one character? Is DSR valid? DSR High? Buffer overflow? Parity error Error? No error Store the received Store 40 H in buffer. character in buffer. Is the printer in DESELECT state or is the paper...

  • Page 120: Troubleshooting Flowchart

    Oki Data CONFIDENTIAL TROUBLESHOOTING FLOWCHART Before Repairing a Fault 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.
  • Page 121 Oki Data CONFIDENTIAL Yes Are ALE, PSEN, RD, WR, signals as specified in Figure B-3-3? 542ns 180ns PSEN 271ns 542ns RD/WR Figure B-3-3 Replace the Q3. Yes Are (T1) SELECT and (INTO) BUSY signals low level? Check Q12 on the Driver board.
  • Page 122 Oki Data CONFIDENTIAL 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 B-3-4? Replace the Q2. Yes Are, WR, and BUS signals of Q3 pin 3 as specified in Figure B-3-5?
  • Page 123 Oki Data CONFIDENTIAL Local Test 3.3.1 Circuit test mode 3.3.1.1Setting Diagnostic test (set by menu) Test connector Connect the test connector shown in Figure B-3-6 to the interface connector Equivalent to Cannon DB-25P Figure B-3-6 Test Connector Connection Diagram 3.3.1.2Function After the settings outlined in Section 3.3.1.1 are completed and power is turned on, the serial...

This manual is also suitable for:

Microline 321 turboMicroline 3321Microline 3320

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