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OKIDATA MICROLINE 320, Service Manual

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OKIDATA MICROLINE 320 Service Manual Download Page 55

3 – 1

AC plug

AC outlet

Power cord

Interface cable

3.

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.

3.1

Precautions for Parts Replacement

(1)

Remove the AC power cord and the interface cable before disassembling or assembling.

(a)

Turn off the power switch. Remove the plug of the AC power cord from the outlet.
Remove the power cord from the receptacle on the printer.

(b)

To reconnect the power cord, connect it to the recptacle on the printer  first, then
plug it into the outlet.

(2)

Do not disassemble the printer as long as it is operating normally.

(3)

Do not remove unnecessary parts, and limit the extent of disassembly as much as possible.

(4)

Use the designated service tools.

(5)

Carry out disassembly in the prescribed sequence; otherwise, damage to the parts may
result.

(6)

It is advisable to temporarily install screws, snap rings and other small parts in their original
positions to avoid losing them.

(7)

Whenever handling the microprocessors, ROM, RAM IC chips and boards, do not use
gloves that may cause static electricity.

(8)

Do not place the printed circuit board directly on the equipment or on the floor.

(9)

If adjustment is specified in the middle of installation, follow the instructions.

Summary of Contents for MICROLINE 320

Page 1: ...Thank You for purchasing this Factory Service Manual on EBAY from PCTECHINFO Click Here for more Factory Service Manuals for other Computer and Printer Copier Manufacturers from PCTECHINFO...

Page 2: ...All specifications are subject to change without notice Service Manual MICROLINE 320 321 TURBO PRINTER 59273701...

Page 3: ...TA est une marque d pos e de Oki Electric Indurstry Company Ltd PREFACE This Service Manual describes how to maintain the Microline 320 321 Turbo printer in the field It is intended for service person...

Page 4: ...0 2 2 1 Printhead Mechanism and Operation 2 20 2 2 2 Spacing Operation 2 23 2 2 3 Head Gap Adjusting 2 25 2 2 4 Ribbon Drive 2 27 2 2 5 Paper Feed Operation 2 29 2 2 6 Paper Detection Mechanism 2 40 2...

Page 5: ...r Tractor Assy 3 24 3 3 21 Rear Pressure Assy 3 25 3 3 22 Switch Lever 3 26 4 ADJUSTMENT 4 1 5 CLEANING AND LUBRICATION 5 1 5 1 Cleaning 5 1 5 2 Lubrication 5 3 6 TROUBLESHOOTING AND REPAIR 6 1 6 1 It...

Page 6: ...on This printer consists of the following assemblies Figure 1 1 Configuration Sheet guide assy Platen knob Access cover assy Upper cover Control Power supply assy Traansformer assy Pull up roller assy...

Page 7: ...1 2 1 2 Options 1 Cut sheet feeder unit CSF Attachment assy 2 Pull tractor assy Single bin CSF...

Page 8: ...1 3 3 Bottom push tractor unit 5 Serial I F RS 232C 4 Roll paper stand Narrow only...

Page 9: ...heral Circuit 1 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...

Page 10: ...former Reset circuit Print IPT I F IPT EEPROM 1 Kbits 67 x 640 ADDRESS ROM AD BUS DRAM 4 64 Kbit 2 LSI RESET 5VD Vcc Level Fuse 40 V LF driver SP driver SP alarm HD Alarm Head driver 2P Encoder M M SP...

Page 11: ...ecutes 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 The following shows the operation of the memory ac...

Page 12: ...Write 8 bit bus byte instruction Clockout is provided when the original excitation is selected 3 RAM MSM51C464A 80RS The RAM is CMOS dynamic RAM with 64K 4 bit 2 configuration and used as buffers such...

Page 13: ...EEDIN P EEDOUT P Address Start code Operation code EEDOUT P EEDIN P EECLK P EECS P D15 D0 D15 D0 D15 0 A0 A5 0 1 1 tCS PRE O PE X Read cycle timing READ Write cycle timing WRITE 4 EEPROM The EEPROM i...

Page 14: ...ddress Address Data Data Clockout is provided when the original excitation is selected 5 LSI This LSI detects and controls the SP motor speeds by monitoring the two phase sensor signals obtained from...

Page 15: ...set the MPU The program sets the mode of the LSI including the MPU checks the memories ROMs and RAMs then carries out carriage homing and determines the LF motor phase Finally the program establishes...

Page 16: ...g processed and outputs the RXD signal to inform the MPU of data reception The data is read upon receiving the RD N signal from the MPU When the data processing ends the BUSY signal is set to off and...

Page 17: ...HEAD1 HEAD9 from the LSI to the print head The LSI generates the print timing and drive time HEAD DRIVE TIMING CHART DT1 DT2 HEAD DRIVE CURRENT Print Data MPU LSI DRIVER HEAD1 N HEAD9 N Print Data Pri...

Page 18: ...ive time Short Long Print Head Time Pin 3 6 Pin 1 2 8 9 Pin coil current Pin 1 2 3 6 8 9 Platen Print Compensation Control The print compensation methods are shown below a Voltage compensation See 2 1...

Page 19: ...3 4 5 Print speed 100 95 85 85 80 Drive time Short Long Drive time lengthens at each step e Print mode compensation According to the thickness of the printing medium the print mode is compensated as s...

Page 20: ...ring through the LSI the pulse length of the output A B of the slit encoder included in the space motor By comparing the target speed for each print mode with the actual current speed to change the sp...

Page 21: ...TILITY MODE 2 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 signal...

Page 22: ...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 mea...

Page 23: ...mmand and when it is found to be legal returns a 2 byte command response back to the LSI which includes data on Switch information LED status receive command ACK NAK and 1 odd parity bit Any transmiss...

Page 24: ...reset LSI write for LED data etc Read instruction for data read Response check for OK or NG Error notification Instruction for retransmission 1 2 3 4 7 8 5 6 NO YES Note From the illustration above y...

Page 25: ...imary coil and open the AC fuse transformer assy 2 Alarm processing when DC power is low 40V is converted into the POWLEV signal 0V to 5V by R28 and R29 and input into the A D port of the MPU to contr...

Page 26: ...below C the mode switches to lower level When the temperature exceeds 119 C printing stops When temperature gradient is steep the higher mode is specified directly 3 Head overheat alarm The voltage o...

Page 27: ...rans former Control Board Rectifier Rectifier Regulation Circuit 40V 8V 5V AC10V The uses of output voltages and signals are described below Voltage signal Use 5V Logic IC LED drive voltage 8V Serial...

Page 28: ...re Spring Yoke Spacer c Magnet assembly Magnet Core Coil Yoke d Printed circuit board e Fin 2 2 Mechanical Operation 2 2 1 Printhead Mechanism and Operation See Figure 2 2 The printhead is a spring ch...

Page 29: ...the direction of the platen by the force of the armature spring The print wire fixed to the armature protrudes from the tip of the wire guide strikes the paper through the ribbon and prints a dot on t...

Page 30: ...2 22 2 When not printing 1 When printing Paper Print wire Platen Paper Print wire Armature assembly Thermistor Wire guide Yoke Magnet assembly Spacer Paper Figure 2 3 Printhead...

Page 31: ...and space motor are mounted moves along the carriage shaft parallel to the platen When the spacing motor rotates counterclockwise the driving force is transmitted to the motor gear As the motor gear...

Page 32: ...2 24 Figure 2 4 Print Head Carriage shaft Space rack Encoder sensor Encoder disk Carriage frame Motor gear Slider Guide rail Adjusting screw Adjusting gear Carriage Assy removed...

Page 33: ...nt If the adjusting gear is pushed down the adjusting screw can be turned with a screw driver to change the coarse gap adjustment When the adjusting lever is set to range the contact attached to the u...

Page 34: ...en Range Adjusting lever Idler gear Adjusting gear Carriage shaft Printhead Adjusting screw Adjusting cam Adjusting screw C C W Printhead Narrows Platen Guide rail Widens C W 1 2 3 4 5 Range from 5 to...

Page 35: ...a single direction feed is used Ink is supplied from an ink reservoir which is built in to the ribbon cartridge 2 Ribbon feed operation When the space motor is activated the ribbon gear rotates The ro...

Page 36: ...2 28 Figure 2 6 Ribbon cartridge Drive gear Ink reservoir...

Page 37: ...per is fed by turning the platen and the pin tractor which is driven by the LF pulse motor The paper feed mechanism consists of the following a Pulse motor with gears b Decelerating gear c Platen d Tr...

Page 38: ...he front are pressed securely to the platen to feed the sheet At the same time he cut sheet detection lever turns on the cut sheet detection switch to confirm to the control board that you are in the...

Page 39: ...ctor feed At the same time the switch lever turns on the bottom switch to inform the control board that you are in the continuous sheet mode Correlation in Mechanism Mechanism Lever Position Rear Swit...

Page 40: ...ssy Release shaft Change arm Change lever Change gear shaft Figure 2 8 TOP Platen REAR BOTTOM Change lever Tractor gear Change gear Reset spring Platen gear R Idle gear Bottom tractor unit Rear switch...

Page 41: ...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 When the change lever is set to the TO...

Page 42: ...d to the platen turns the tractor gear by means of the platen gear the idler gear and the change gear The rotation of the tractor gear turns the sheet feeder shaft which moves the pin tractor belt fee...

Page 43: ...e 2 11 This mechanism supports the standard push tractor and an optional pull tractor It can perform forward and reverse feed by sending paper either to the push tractor for rear feed or to the pull t...

Page 44: ...is transmitted to the idle gear of the pull tractor unit through the platen gear at the left end of the platen The rotation of the idle gear is transmitted to the drive gear and paper is fed when the...

Page 45: ...unit When the platen turns its rotational force is transmitted through the tractor idle gear and the tractor change gear to the tractor drive gear of the bottom push tractor and paper is fed to the p...

Page 46: ...f the front release gear arm changes according to the position of the release cam At the same time the position of the cam relative to the front release gear arm changes opening or closing the pressur...

Page 47: ...2 39 Figure 2 14 Change lever Release cam Platen Front release gear arm TOP BOTTOM REAR Pressure rollers...

Page 48: ...the point B is pushed to the front side and the paper near end lever A rotates clockwise CW At this time the rear sensor lever rotates counterclockwise CCW and pulls out of the rear and top paper end...

Page 49: ...2 41 Paper end sensor Sensor lever Shaded portion A B Paper end lever Bottom paper end lever Figure 2 15 C...

Page 50: ...osition very close to the printhead 0 tear off position to start printing at the top of the sheet without causing it to crumple or curl up Printing starts at the top of the sheet and continues uni dir...

Page 51: ...2 43 Platen Figure 2 16 Ribbon protector Printhead Carriage frame assembly...

Page 52: ...platen and the paper chute 3 After the lapse of time selected by the wait time item in the menu the LF motor starts to feed the paper up to the print position 4 When the default is selected the paper...

Page 53: ...the paper up to the print start position 5 The paper feeds up to the TOF position Factory default 0 35 inches from the top Press the FF LOAD button Detection of the sheet supplied PE LF action Line fe...

Page 54: ...d 3 The paper feeds in reverse to leave the paper on the tractor The alarm LED lights up when paper end is not detected after 19 inches of reverse feeding The operator can press the SEL button to turn...

Page 55: ...ect the power cord connect it to the recptacle on the printer first then plug it into the outlet 2 Do not disassemble the printer as long as it is operating normally 3 Do not remove unnecessary parts...

Page 56: ...ice tools 1 No 1 100 Phillips 1 Screws screwdriver 2 6 mm 2 No 2 200 Phillips 1 Screws screwdriver 3 5 mm 3 No 3 100 1 screwdriver 4 Spring hook 1 5 J YX4025 83335 3 1 Head gap adjustment 6 Volt ohmme...

Page 57: ...ansformer assy Operation panel board Printhead Printer unit Driver board 3 3 Disassembly Reassembly Procedure This section explains the assembly replacement procedures according to the following disas...

Page 58: ...3 3 5 Gear case assy 3 3 6 PC connector 3 3 7 Space motor and guide roller assy 3 3 8 Space rack 3 3 9 Carriage cable 3 3 10 Back up roller holder assy 3 3 11 Platen assy 3 3 19 Paper pan 3 3 12 Driv...

Page 59: ...printhead 2 into the PC connector 3 while pushing it against the carriage frame 4 2 The head clamp 1 must be securely sandwiched between printhead 2 and carriage frame 4 as shown in fig 3 3 2 3 Be sur...

Page 60: ...e frame 4 Loosen the screws holding the carriage assembly to the carriage frame this allows more play between the printhead and the platen 5 Raise and remove the ribbon protector 2 6 To install follow...

Page 61: ...the sheet guide Assy 4 to remove 3 Tilting the pull up roller Assy 2 toward the front remove it from the shaft of platen Assy 3 4 To install follow the removal steps in reverse order Note Remove the s...

Page 62: ...river into grooves of frame 5 places for ML 321 4 places for ML320 and twist to disengage claws of upper cover 3 6 Raise the front side of upper cover Assy 3 and shift toward the rear to disengage cla...

Page 63: ...den the claw for easy disengagement 6 Lift up the gear case Assy 3 and release the carriage cable from the cable clamp of the gear case Assy 7 To install follow the removal steps in reverse order Be s...

Page 64: ...the space motor Assy 2 5 To install follow the removal steps in reverse order Be sure to replace the shim on the carraige frame in exactly the same position as it was before disassembly Notes on insta...

Page 65: ...he two screws 5 from the space motor Assy 8 Remove the space motor 9 To install follow the removal steps in reverse order Notes on installation 1 Do not touch the terminals of space motor 1 Also take...

Page 66: ...6 Remove the spring 1 7 Disengage the claw on left side of space rack 2 from the frame and remove the space rack 2 in upper direction 8 To install follow the removal steps in reverse order Be sure to...

Page 67: ...r 3 4 5 6 7 Remove the carriage cable 7 from fasteners on frame 8 To install follow the removal steps in reverse order Be sure to replace the shim on the carraige frame in exactly the same position as...

Page 68: ...3 3 5 3 4 Remove the backup roller spring 2 Disengage claws of roller holder from the carriage frame 1 2 places and remove the backup roller holder assy 3 6 To install follow the removal steps in rev...

Page 69: ...Assy see 3 3 3 4 Remove the ribbon protector see 3 3 2 5 Turn the change lever 1 to the bottom position 6 Push in the lock levers 2 on both sides to unlock the Assy from the frame then rotate them upw...

Page 70: ...crews 1 and release the driver board 2 by lifting clamp 4 3 Disconnect all cables from driver board 2 4 To install follow the removal steps in reverse order Note on installation Insert sensor lever 3...

Page 71: ...Assy see 3 3 3 5 Remove the platen Assy see 3 3 11 6 Remove the driver board see 3 3 12 7 Remove the left FG plate 1 lift base at three points to release tabs 8 Release the lock A to remove the LF mo...

Page 72: ...onnect cable 1 from connector 3 of driver board 2 3 Disengage claws on both sides from the frame and remove the operation panel 4 4 Open claws 8 places and remove the operation panel PCB 5 from the op...

Page 73: ...ove cable 5 from connector 4 on the control power supply board 1 4 Remove the two screws 6 and remove the controlpower supply board 1 5 To install follow the removal steps in reverse order Note on ins...

Page 74: ...inlet 1 and AC switch 2 from the frame guide 3 Disconnect the cable 3 from the connector 4 on the Control Power Supply Board 5 4 Remove a screw 6 and disconnect ground cable 7 5 Remove two screws 8 a...

Page 75: ...shaft 6 gently with a flatblade screw driver to remove the change lever 3 Note The change lever can be difficult to remove be careful not to exert too much force with the screwdriver Make sure the spr...

Page 76: ...3 Remove the driver board see 3 3 12 Remove the FG plate L 2 4 Slide the carriage shaft 1 to the left side in the direction of the arrow to remove 5 To install reverse the removal procedure Note on in...

Page 77: ...ve the ribbon protector see 3 3 2 3 Remove the pull up roller assy see 3 3 2 4 Remove the upper cover assy see 3 3 4 5 Remove the platen assy see 3 3 11 6 Release claws A 7 Lift up the paper chute ass...

Page 78: ...ove the reset spring see 3 3 17 3 6 Remove the tractor gear 1 7 Shift the drive shaft 2 to the right side to remove in the direction of the arrow 8 To install reverse the removal procedure Note on ins...

Page 79: ...e removal steps in reverse order Note 1 When installing the release shaft 2 pay attention to the gear engagement of release shaft 2 change arm lever 6 and change gear shaft 7 2 On the ML321 Turbo ther...

Page 80: ...pan see 3 3 19 4 Remove the rear pressure assy see 3 3 21 5 Pull the switch lever toward you and remove it upward 6 To install follow the removal steps in reverse order Note on installation When insta...

Page 81: ...t these adjustments with the printer mechanism installed on the lower cover 2 Be sure to carry out these adjustment operations on a level and highly rigid work table flatness less than 0 039 inch or 1...

Page 82: ...adjusted by rota ting the adjust cam 2 Set the adjust lever at the Range 1 Press the adjust gear downward in direction A to push the adjust gear and the adjust gear out of mesh 3 Adjust the gap by rot...

Page 83: ...be measured positioning the platen gear R craw on the top Note 3 Move the adjust screw in clockwise direction in direction B to measure Measure variation of gap when range is changed 4 1 2 G a p 0 6 9...

Page 84: ...uching Adjust lever Contact Motor PCB Verify the following Make sure that the gap between the con tact and the motor PCB is 0 3 mm or more At the time of printing test make sure that the contact touch...

Page 85: ...is set at Friction position all the pressure rollers shall be pressed to the platen 2 When the change lever is set at Rear or Bottom position the gap between the pla ten and the pres sure roller at t...

Page 86: ...r shall rotate smoothly when the change lever is set at Friction posi tion Backlash between gears 4 4 2 Approx 0 05 to 0 11 mm Verify There shall be slight backlash between gears to allow smooth rotat...

Page 87: ...hall be fed smoothly when the carriage is moved from side to side Running load to spac ing mechanism 4 5 2 Verify Make sure that the power is turned off at the time of measure ment 250g or less withou...

Page 88: ...and the bias gear rotate against each other to pinch the teeth of idle gear The idle gear stays in mesh with the platen gear L and the bias gear and not locked The bias gear and the platen gear shall...

Page 89: ...cleaned be sure to apply lubricating oil to that part after cleaning 1 Cleaning time After six months or 300 hours of operation whichever comes first 2 Cleaning tools Dry cloth soft cloth such as gau...

Page 90: ...5 2 Carriage shaft...

Page 91: ...e dust on the sensor 2 Lubricant Pan motor oil or equivalent PM Molicort or equivalent EM 30L 3 Amount of lubricant Medium amount A Apply three to four drops of oil or 0 008 inch 0 2 mm thick grease S...

Page 92: ...2 Space rack Idle gear shaft upper and lower PM B 0 006 0 002g Space rack Rack upper side Approx 30 greasing range Planetary gear shaft upper and lower EM 30L A Drive gear shaft upper and lower PM B...

Page 93: ...5 5 3 Platen Assy Bias gear Contact face of the 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...

Page 94: ...EM 30L A Sliding surface of change lever and gear EM 30L A 1234 1234 1234 A A Arrow view Sliding surface of change arm and change lever EM 30L A Tractor gear bearing portion EM 30L A Idle gear teeth E...

Page 95: ...holder and release shaft cam surface release shaft plane portion EM 30L A Bearing part of the front roller holder and pressure roller EM 30L B Shaft Rear roller holder Release shaft protruding part 2...

Page 96: ...5 8 7 Pull up roller Assy Pull up roller frame Pull up roller shaft All bearing parts of the pull up roller shaft and pull up roller frame EM 30L B Gear and post EM 30L A...

Page 97: ...5 9 Models N ML320 Turbo W ML321 Turbo 8 Main chassis Assy Grease part Grease part at rib N 9 portions W 13 portions EM 30L A Grease part N 3 parts W 5 parts rear side EM 30L A...

Page 98: ...5 10 9 Carriage Assy NK2 10 SUS Bearing part of the guide roller EM 30L B...

Page 99: ...Surmise of Trouble Power is not supplied No spacing operation 1 2 Control Power Supply Board Driver Board Transformer Assy Space Motor Carriage Cable Printhead Homing does not end normally 3 Space Mo...

Page 100: ...r Board Space motor thermal alarm OFF BLINK 1 Temperature of space motor exceeds specified value It is recovered automatically Replace SP motor or Driver Board FATAL ALARM BLINK 2 OFF OFF See Table 6...

Page 101: ...nd it ios reset after 65ms NMI port of MPU is kept low level FFFF data is detected due to MPU locked up Read write error Check sum error Read write error No reaction from serial I F board Replace Cont...

Page 102: ...PRINT HEAD ALARM Print Head Gap A D alarm Replace space motor Replace P H cable Replace Control Power Supply Board Check the mechanisms if load is too much Check the P H connection Replace Print Head...

Page 103: ...6 5 LF motor Control Power supply board AC connector Transformer Driver board Operation panel board Centro connector Switch Printhead Space motor...

Page 104: ...uit Check for Printhead and SP LF Motor 1 Printhead Signal Connector pin number CN1 1 1 2 2 3 4 4 6 5 8 6 7 8 9 10 11 9 12 7 13 5 14 3 15 Thermistor HEAD1 HEAD2 HEAD4 HEAD6 HEAD8 EL HTEMP 40V 40V 40V...

Page 105: ...6 7 2 Line Feed Motor Resistance of each coil should be about 7 6 Signal Connector pin number LF1 LF2 LF3 LF4 CN6 LF motor...

Page 106: ...6 8 3 Space Motor Resistance of each coil should be about 5 Signal Connector pin number SP U SP V SP W SPA SPB 5V EL CN2 SP Motor A B DA Vcc DK G 200 3 5 2 20 10 11 18 R1...

Page 107: ...y board blown No Yes Replace fuse with same type and rating Remedied No Yes End Does DC 8V out No Yes Turn power off remove printhead then turn on Remedied No Yes Replace printhead End Replace carriag...

Page 108: ...ver Board CN2 20 1 No Yes Replace driver board Replace transformer assy Remedied No Yes End Replace control power supply board Pin No 20 19 18 17 16 15 14 13 10 9 8 7 6 5 Signal 8V EP 40V AC EL 5V F G...

Page 109: ...inding or jammed No Yes Check for dust build up around space motor between the teeth of the space rack back up roller ribbon feed mechanism and carriage frame etc Replace space motor assy Remedied No...

Page 110: ...ack ribbon feed assembly back up roller carriage frame support protector and ribbon protector Remedied No Yes End Replace space motor assy Replace space motor assy Remedied No Yes End Replace carriage...

Page 111: ...led narrow 3 pcs wide 5 pcs Tension of all of the front pressure rollers is properly set Make sure the position and fit of the change gear shaft change arm shaft and release shaft are correct Check th...

Page 112: ...ts Does ALARM LED blink and display alarm No Yes See Tables 6 2 and 6 3 for troubleshooting information Replace printhead Remedied No Yes End Replace driver board Remedied No Yes End Replace carriage...

Page 113: ...rk print Is the printhead gap set properly Yes No Adjust the printhead gap see section 5 Remedied No Yes End Replace printhead Remedied No Yes End Replace driver board Remedied No Yes End Replace ribb...

Page 114: ...Move carriage to left and right Does the ribbon drive shaft rotate No Yes Change ribbon cartridge Remove ribbon feed mechanism Move carriage to left and right Does the ribbon drive shaft rotate No Yes...

Page 115: ...mbly Is the LF motor idle gear broken No Yes Replace the LF motor assembly or LF idle gear Is the platen gear R idle gear or change gear broken No Yes Replace the gear Set change lever to the rear pos...

Page 116: ...nction of switch on operation panel Is the CN1 of Operation panel connected to the CN3 on the driver board Yes No Connect the cable properly Replace operation panel board Remedied No Yes End Replace d...

Page 117: ...e when the function is not required Is the I F RS232C No Yes Go to step 10 2 Does the SEL LED light up Yes No Press the SEL key Remedied No Yes Does the printer receive data properly No Yes Go to step...

Page 118: ...See tables 6 2 and 6 3 for troubleshooting Make sure the parameters for RS232C in the menu are correct Baud rate Bit length Parity Protocol Busy signal and its polarity Remedied No Yes End Is 8V suppl...

Page 119: ...6 21 Replace RS232C board Remedied No Yes End Replace driver board...

Page 120: ...A 1 A PCB LAYOUT PCB list 1 Circuit board SDCT Control Power Supply 2 Circuit board SDDV Driver 3 Circuit board LEOP 3 Operation Panel 1 2 3...

Page 121: ...B 1 B SPARE PARTS LIST...

Page 122: ...B 2 Figure 11 1 Upper Cover Assy 1 2 3 4...

Page 123: ...per cover W 1 2 For ML321 Turbo For OEL 1PP4128 1231P2 Upper cover W 1 2 For ML321 Turbo 53076602 2 1PA4094 7305G10 Sheet guide assy N 1 2 For ML320 Turbo 51009409 1PA4094 7308G11 Sheet guide assy W 1...

Page 124: ...B 4 Figure 11 2 Printer General Assy 6 9 8 2 7 4 5 3 10 1...

Page 125: ...2 50221901 assy 6 3YS4011 1315P1 AC cord 1 1 For ODA 56609701 3YS4011 1266P1 AC cord 1 1 For OEL 3YS4011 1329P2 AC cord A 1 1 For INT 3YS4011 1269P1 AC cord for 230V 1 1 7 4YA4023 3301G1 Printhead 9...

Page 126: ...B 6 Figure 11 3 Printer Unit A A B B 1 2 3 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 36 9 33 34 35 32 31 29 30...

Page 127: ...4 5158P1 Paper pan plate W 1 2 For ML321 Turbo 53349301 8 3PP4025 3320P2 Leaf spring N 1 2 For ML320 Turbo 50923002 3PP4025 3507P2 Leaf spring W 1 2 For ML321 Turbo 50923102 9 3PP4044 5011P1 Paper end...

Page 128: ...2810P2 Adjust cam 1 1 51238601 28 4PP4044 5009P1 Carriage shaft 1 1 For ML320 Turbo 51114201 4PP4044 5009P2 Carriage shaft 1 1 For ML321 Turbo 51114202 29 3PP4044 5005P1 FG plate L 1 1 30 3PA4044 505...

Page 129: ...B 9 Figure 11 4 Carriage Assy 12 9 8 6 14 11 10 1 13 7 5 4 3...

Page 130: ...YA4044 5100G1 Space motor assy 1 4 56513701 7 3PB4044 5506P1 Head cable 9N 1 5 For ML320 Turbo 56633801 3PB4044 5507P1 Head cable 9W 1 5 For ML321 Turbo 56633802 8 3PB4044 5125P1 15 pin connector 1 2...

Page 131: ...B 11 Figure 11 5 Option Spare Parts 1 2 3 4 5 6 7 Pull Tractor Bottom Tractor I F Board...

Page 132: ...actor assy R 3 2PP4128 1239G1 Tractor cover assy N 1 3 For ML320 Turbo 53077201 2PP4128 1243G1 Tractor cover assy W 1 3 For ML321 Turbo 53077301 4 1PA4128 1277G1 Bottom push stand L 1 2 51902301 5 1PA...

Page 133: ...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 simulta...

Page 134: ...transfer through a serial port b Message buffer c Transmission of parallel data to the printer 2 SN75189 An RS 232C standard line receiver 3 SN75188 An RS 232C standard line driver 4 2764 An 8 kbyte...

Page 135: ...2764 ROM 8 KB RD TD RAM 8 KB Driver 5 VD 10 VAC 5 V 9 V 9 V 5V 0V 9 V power supply circuit Serial data control line Bus line Control line 2 2 3 3 4 4 ADR latch Receiver DB0 to DB9 ADR data bus ADR bus...

Page 136: ...ialization Initialization consists of setting the 80C51 timer and setting the serial mode 2 2 2 RS 232C interface The DTR SSD TD and RTS signals output by the 80C51 are converted to RS 232C signals by...

Page 137: ...w No No Yes Yes No DSR High Yes Store 40 H in buffer Yes Yes No Yes Is remaining buffer space 256 Yes No Turn on the SSD signal Turn off the SSD signal Printer busy No Output one character from the bu...

Page 138: ...te or is the paper low No No Yes Yes No DSR High Yes Store 40 H in buffer Yes Yes No Yes Is remaining buffer space 256 Yes No Printer busy No Output one character to printer No Yes No Has 200 ms elaps...

Page 139: ...ter under the same conditions as that at the time of the problem to see if the same trouble occurs again If not perform the printer s self test and thoroughly test the printer s functionality If the t...

Page 140: ...BUSY state and BUSY LINE is in SSD state Is the OSC oscillation waveform as specified in Figure C 3 1 No Replace the OSC Yes Is a RST signal in Q3 is as specified in Figure C 3 2 No Check the RST circ...

Page 141: ...V input to Q1 No Replace defective component in 9 9 volt control circuit Yes Is pin 1 SSD signal of Q3 High level No Replace the Q3 Yes Is pin 11 SSD of Q1 low level No Replace the Q1 or the CN1 conne...

Page 142: ...Q3 as specified in Figure C 3 4 No Replace the Q2 Yes Are WR and BUS signals of Q3 pin 3 as specified in Figure C 3 5 No Replace the Q3 Yes Is the level of BUS signals at Q7 pins 2 9 the same as that...

Page 143: ...ection Diagram 3 3 1 2Function After the settings outlined in Section 3 3 1 1 are completed and power is turned on the serial interface checks the message buffer memory and interface driver receiver c...

Page 144: ...nted If DSR CTS and CD signals are all Low IF OK is printed 6 Output level to DTR RTS and SSD signals is raised high If DSR CTS or CD signals is Low IF BAD is printed If DSR CTS and CD signals are all...

Page 145: ...Microline 320 321 Turbo Service Manual Part Number 59273701 Printed in the USA...

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