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OKI MICROLINE 591 Matrix Printer

1. 5 Detach connectors CN7 operator panel 4 CN8 carriage cable 5 CN3 power supply 6 and CN6 line feed motor 7 6 Remove the board NOTE Installation The bottom sensor lever must be positioned in the SNS3 sensor 8 The rear sensor lever must be positioned in the SNS1 sensor 9 The cut sheet continuous sensor lever must be positioned below the BASW sensor 10 The lever should contact the sensor only when the change lever is in the top feed middle setting The IC EEPROM is soldered in on the board P N 55937401 PCB AKGI w o ROM RSPL Both B 2 02 5 P N 55938301 IC EEPROM BR93CC46A RSPL Both B 2 024J Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 100 Tw FG Service Guide ML590 ML591 OKIDATA Chapter 3 Maintenance amp Disassembly 3 2 08 Power Supply Assembly Perform these procedures 8 9 3 2 01 4 3 2 06 4 Detach the cable from connector CN2 1 of the power supply board 2 Detach the cable from connector CN3 3 of the control board 4 Use a straight slot screwdriver to release the claws and remove the cable clamp 5 Remove the cable 6 Release the tab and remove the cover 7 Remove the screw 8 and detach the ground cable 9 Lift the AC inlet 10 and the AC switch 11 from the main frame 12 Remove the two screws 13
2. Slide the power supply in the direction of arrow A to clear the claws of the base frame 10 Lift and remove the power supply assembly NOTE The 5 amp fuse is on the end of the board facing the AC inlet and the AC switch The 2 5 amp fuse is near the middle of the board When installing verify that the AC inlet and AC switch are oriented correctly AC Inet AC Switch EA A a fiia x P N 50707501 Clamp Cord RSPL Both B 2 024 P N 56302901 Fuse 2 5A 120V RSPL Both B 2 024 P N 56305901 Fuse GGS 5 120V RSPL Both B 2 024 P N 56306001 Fuse 3 15 A 230 240V Option RSPL Both B 2 08 P N 56306001 Fuse 3 15 A 230 240V Option RSPL Both B 2 02 5 P N 56412101 Power Supply 120V RSPL 590 B 2 024 P N 56412102 Power Supply 120V RSPL 591 B 2 02 4 P N 56412201 Power Supply 230 240V Option RSPL 590 B 2 02 5 07 ii P N 56412202 Power Supply 230 240V Option RSPL 591 B 2 02 43 07 4A Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 101 OKIDATA Service Guide ML590 ML591 i Chapter 3 Maintenance amp Disassembly 3 2 09 Operator Panel PCB LEOP Perform these procedures 3 2 01 3 3 2 06 31 3 2 07 35 1 Cut the nylon tie and release the cable Not shown 2 Disengage the claws 1 on both sides of the frame ee Lift the operator panel assembly 2 straight up and
3. 4 4 05 Common Problems 150 4 5 Abnormal Output amp Output Samples 151 ae Left Margin Drifting Problem 152 4 6 Fault Alarms 153 4 6 02 Alarm LED Display Troubleshooting Table Index 154 4 6 03 Alarm LED Display Troubleshooting Tables 155 4 7 Repair Analysis Procedures RAPs 156 4 7 01 Using the RAPs 157 4 7 02 RAP Index 158 ee RAP 01 No Power Supplied to Printer 159 passa RAP 02 No Spacing Operation 160 ee RAP 03 Printhead Homing Error 161 cara RAP 04 Paper Jam During Paper Loading 162 P RAP 05 Printhead Pins Not Firing 163 PPEP RAP 06 Poor Print Quality 164 Bee RAP 07 Ribbon Feed Problem 165 eerie RAP 08 Line Feed Problem 166 aoe RAP 09 Operation Panel Malfunction 167 ere RAP 10 Parallel Interface Problem 168 Table of Contents Page eee RAP 11 Serial Interface Problem 169 4 8 Printer Tests 170 4 8 02 Rolling ASCII Test 171 4 8 03 Font Test 172 4 8 04 Serial Interface Loopback Test 173 ee Serial Cable Information 174 TEPS Commonly Used Serial Cable Configurations 175 4 8 05 Hexadecimal Dump Mode 176 4 9 Resistance Checks 177 4 9 02 Printhead Interconnect Diagram Control Board to 178 Printhead 4 9 03 Line Feed Motor Resistance 179 4 9 04 Space Motor Resistance 180 A Reference Charts General Information 181 A 2 Index To Charts 182 Interconnect Diagram 183 A 2 01 Main Controller Board AKGI 184 A 2 02 Operator Panel Board LEOP 185 A 2 03 Power Supply Asse
4. Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 82 Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation Continuous Paper Feed Pull Tractor Mechanism Bottom feed of continuous sheets is possible only when an optional pull tractor unit is installed As the platen rotates power is transferred to the drive gear from the LF idler gear the platen gear idler gear B and idler gear A The drive gear turns the pull tractor assembly which feed the continuous paper Cantinweus form Pullbatiam Tractor assembly Orve gear Wie gear 4 idle gear Bo Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 83 OKIDATA Service Guide ML590 ML591 Chapter 2 Principles of Operation Continuous Paper Feed Bottom Tractor Feed Mechanism As the platen rotates power is transferred to the drive gear from the platen gear the idle gear and the tractor change gear The drive gear turns the pin tractor belts on the bottom tractor feed unit to feed the continuous paper N Drive gear Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this mater
5. 1 Perform these procedures 3 2 01 3 2 0 3 2 0 3 2 1 a 2 06 35 2 07 3 2 118 2 Slightly bow the carriage cable 1 to release it from the claws 2 and the projection on the main frame 3 3 Remove the carriage cable NOTE Installation The contacts on the cable face up when the cable is positioned on the main frame The cable end with the 45 angled contacts connects to the gear case assembly DO NOT sharply bend the carriage cable You will slightly bow the cable to position it under the claws and over the projection P N 56627301 Cable Carriage Narrow RSPL 590 B 2 06 5 P N 56627302 Cable Carriage Wide RSPL 591 B 2 06 i Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 105 OKIDATA Service Guide ML590 ML591 A se Chapter 3 Maintenance amp Disassembly 3 2 13 Space Rack 1 Perform these procedures 3 2 01 3 2 02 3 2 04 3 2 10 3 2 11 gt a a a EH 2 Remove the spring 1 3 Disengage the claws 2 on the both ends of the space rack 3 4 Pull the space rack straight up and remove it NOTE Installation After installing the space rack check the printhead gap adjustment Refer to Section 3 3 of this Service Handbook i Cleaning When cleaning refer to Section 3 4 of this Service Handb
6. 16 bit MPU using CMOS technology The MPU contains a 20 bit address bus a 16 bit data bus The MPU can access 1 Mbyte of program memory space and 1 Mbyte of data memory space The microprocessor controls the entire printer by executing the control program through the LSI and the driver circuit AL 5 97 FLOCK De A Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 46 Service Guide ML590 ML591 Chapter 2 Principles of Operation i FET 7 PROG I pe DRAM MH hore Aca a d in Termal A a maligen Head Le ee Wee l Aco CH E Driver BAF E O mal y y o BATSIG _ 5 a aN iomtion 2P Enei od U aie LT eM LF TSD Th Fuma Pat BAL 05 97 BLOCK HADAM Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 47 6 Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation Program ROM Location 05D 2701024 This 64k x 16 bit Mbit EPROM contains the control program for the printer The MPU executes the instructions contained in this program The Program ROM is assigned to the program memory area of the MPU and instructions are fetched by the PSEN signal of the MPU Bo Bis Copyright 1997 O
7. 2 Cut the nylon tie and release the cable Not shown 3 Work the left ground plate 1 up and then out to remove it P N 51010301 Plate Left Ground RSPL Both B 2 034 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 109 OKIDATA Service Guide ML590 ML591 i Chapter 3 Maintenance amp Disassembly 3 2 17 Right Ground Plate 1 Perform these procedures 3 2 01 E 3 2 06 2 Pull the top tabs 1 of the right ground plate 2 out to free the plate from the claws of the base frame You may have to use a screwdriver to work the plate tabs free 3 Lift the plate and remove it NOTE Installation The plate must be securely seated under the claws P N 51010201 Plate Right Ground RSPL Both B 2 04 77 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 110 OKIDATA Service Guide ML590 ML591 i J l Chapter 3 Maintenance amp Disassembly 3 2 18 Rear and Cut Sheet Paper Feed Sensor Levers 1 Perform these procedures 3 2 01 E 3 2 06 3 2 07 3 2 16 E 2 Turn the cut sheet continuous feed paper sensor lever 1 until the flag is at the top then work the lever free 3 Remove the lever 4 Turn the rear feed paper
8. 57 OKIDATA Service Guide ML590 ML591 Chapter 2 Principles of Operation Print Compensation Control The printhead compensates for the shape of the platen as shown below Note Refer to Section 2 1 08 Head Drive Time 4 Platen Ag shown in the drawing left since the stroke length up to the platen is different far each pin the information of each pin within the print head is fed back to the logie circuit from the sensor analog circuit ta set the optimum drive time for each pin by controlling the pin coil current for each pin Print Head Pin 1 2 23 24 Pin coal current Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 58 OKIDATA Service Guide ML590 ML591 Chapter 2 Principles of Operation 2 1 06 Space and Line Feed SP LF Motor Control The LSI Location 02D MSM79V035 generates the space motor and the line feed motor control signals according to commands received from the MPU These signals are sent to the SP LF motor driver MIMTSIVOAs DATA H SLATCH N Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 59 r Ww Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation Line Feed Motor C
9. Ribbon protector i Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 87 OKIDATA Service Guide ML590 ML591 Chapter 2 Principles of Operation 2 2 08 Automatic Paper Load The Microline 590 591 printers will automatically detect cut sheet paper and feed the paper to the TOP OF FORM position Cut Sheet Paper Set the change lever to the TOP FEED position Note When the change lever is in the TOP FEED position the cut sheet detection lever contacts the cut sheet detection switch BASW which is located on the main control board Insert the sheet of paper between the platen and the paper chute Once paper is detected at the paper end sensor and the amount of time selected on the Wait Time setting of the menu has lapsed the line feed motor will feed the paper until the leading edge of the paper reaches the top of form position Shaped setting a V i Tm aut PE 7 Ceetection timer LS n pa time selected on the menu l e ee LF action i ee RearFeed Bottom Feed d B Carine Cee s j Cut ihag Cut pheel deriecugn lever detection switch ey ro an ji 3 L gt a detection lower al Cul sheet detection switch Cutsheee detection lever Continuous Feed Paper Set the change lever to either the REAR FEED or BOTTOM FEED position NOTE
10. When the change lever is in the REAR FEED or BOTTOM FEED position the cut sheet detection lever does not contact the cut sheet detection switch BASW which is located on the main control board Place continuous feed paper in the appropriate tractor Press the FF LOAD switch The line feed motor will feed the paper until the leading edge of the paper to the top of form position Push down the FF LOAD switch W 7 Detection of the sheet supplied TE LF action Line feed about 3 inches until the detection of the sheet supplied Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 88 r Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation 2 2 09 Paper Park If continuous feed paper is installed and printing on cut sheet paper is desired it is not necessary to unload the continuous feed paper The Paper Park feature provides a means of retracting the continuous feed paper from the paper path to allow feeding of the cut sheet paper Paper Park Operation Make sure the change lever is in the REAR FEED or BOTTOM FEED position Press the PARK switch on the operation panel A reverse line feed operation retracts the paper until paper end occurs or 19 inches of paper have been retracted Note Retracting 19 inches of paper without detecting a paper end cond
11. 360 12 cpi 450 15 cpi Print Speed at Different CPI for the ML 590 Page 9 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 10 OKIDATA Service Guide ML590 ML591 a Fa Chapter 1 Product Specifications 1 6 02 Characters Per Line Microline 590 Characters Per Characters Per Utility Letter Quality Line Inch w e os oo ee b Microline 591 Characters Characters Utility Letter Quality Per Line Per Inch C fm e fp Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 11 OKID AT A Service Guide ML590 ML591 Chapter 1 Product Specifications 1 6 03 Character Pitches 5 6 8 5 10 12 15 17 1 20 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 12 OKIDATA Service Guide ML590 ML591 a Chapter 1 Product Specifications 1 6 04 Character Sets Standard ASCII EPSON Character Set amp II IBM Character Set I II amp All Characters Foreign Character Substitution International Character Sets Code Page 850 860 863 and 865 Bar Code Code 39 UPCA UPC E EAN 8
12. 5 Remove the roller guide assembly 5 and guide roller spring 6 6 Use firm pressure to pull the carriage cable 7 out to detach the cable from the space motor assembly 7 Remove the space motor assembly NOTE The guide roller assembly includes the guide roller 8 the guide roller holder 9 and the pin 10 Installation Position the guide roller assembly first The contact side of the cable faces down when the carriage cable is inserted into the connector on the space motor assembly Work the cable from side to side until it is fully seated in the connector No contacts should be visible After installing the soace motor assembly check the printhead gap adjustment Refer to Section 3 3 of this Service Handbook 4A When lubricating refer to Section 3 5 of this Service Handbook a P N 53343001 Holder Connector L RSPL Both _ B 2 06 P N 53343101 Holder Connector R RSPL Both B 2 0643 P N 56510401 Motor Space Assembly RSPL Both B 2 06 5 P N 53343301 Guide Roller Assembly Both B 2 06 7 P N 53341901 Roller Guide RSPL Both _ B 2 06 P N 53342001 Holder Guide Roller RSPL Both B 2 06 P N N APin Both B 2 06 3 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 104 OKIDATA Service Guide ML590 ML591 Chapter 3 Maintenance amp Disassembly 3 2 12 Carriage Cable
13. Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 90 OKIDATA Service Guide ML590 ML591 i J l Chapter 3 Maintenance amp Disassembly 3 1 02 Maintenance Tools The following tools are required to service the printer 2 Phillips Screwdriver with magnetic tip Straight slot Screwdriver Needle Nose Pliers 4 Inch Wire Cutters Digital Multimeter Feeler Gauge capable of measuring 014 inches Shop Vacuum Clean soft and lint free Cloth All Purpose Cleaner Contact Kleen Okidata P N 51802301 Platen Cleaner Machine Grease Machine Oil Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 91 OKIDATA Service Guide ML590 ML591 e es Chapter 3 Maintenance amp Disassembly 3 1 03 Maintenance Precautions OounwrhRWND N Oo O1 amp N 9 10 11 Do not disassemble the unit if it is operating normally Before starting disassembly and assembly always turn the AC power switch OFF and pull out the AC plug Detach the interface cable if installed Do not remove parts unnecessarily Try to keep disassembly to a minimum Use the recommended maintenance tools When disassembling follow the listed sequence Failure to follow the corre
14. Exchange BPX for any updates to this material http bpx okidata com Page 73 OKID ATA Service Guide ML590 ML591 F Chapter 2 Principles of Operation Printhead Operation When the printhead is idle the armature is attracted to the permanent magnet The print wires which are attached to each armature are then concealed inside the wire guide When a signal to print a character is received current flows through a coil The magnetic field generated by the coil opposes the magnetic field between the armature and the permanent magnet The armature is then driven in the direction of the platen by the force of the armature spring The print wire which is attached to the armature protrudes from the tip of the wire guide strikes the paper through the ribbon and prints a dot on the paper As the armature gets closer to the electrode of the analog sensor the capacitance between them increases and a small amount of current flows This current is amplified and sent to the logic control LSI to indicate armature activity In order to attain optimum drive time this information is transferred to the MPU The MPU continually modifies the head gap to maintain the optimum drive time condition The analog sensor element monitors all of the pins The difference in pin stroke due to the curvature of the platen is compensated for at the logic control section of the printhead and is not transferred to the MPU After the character has been printed
15. characters Magenta Approximately 1 5 million characters Yellow Approximately 0 8 million characters 1 11 06 Warranty Limited Two years parts and labor 1 11 07 Service Authorized Okidata Service Centers Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 44 Ww Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation 2 1 ELECTRICAL OPERATION 2 1 01 General Information The printers is made of the following electrical components Main Control Board Power Supply Assembly Operator Panel Space Motor Line Feed Motor Printhead Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 45 te Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation 2 1 02 Main Control Board The main control board is made up of the microprocessor peripheral circuits drive circuits sensors and interface connectors The power to the main control board is supplied by the power supply assembly through a wire harness The power to other electrical parts such as the line feed motor space motor and printhead is supplied by the power supply assembly through the connectors on the main control board Microprocessor MPU Location 04D 67X640
16. com Page 74 rT AT A Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation 2 2 02 Spacing Mechanism The spacing mechanism consists of a carriage shaft mounted parallel to the platen and a carriage frame which moves along the shaft The carriage frame is driven by a DC servo motor mounted on the carriage frame Items included in the spacing mechanism are listed below Space Motor Assembly DC Servo Motor Motor gear Sensor Encoder Disk Carriage Frame Carriage Shaft Space Rack Spacing Operation The carriage frame which contains the printhead and space motor moves along the carriage shaft parallel to the platen When the space motor rotates the driving force is transmitted to the motor gear As the motor gear rotates the carriage moves along the platen For every revolution of the DC servo motor the carriage frame moves 0 8 inch 20 32 mm As the DC servo motor rotates a slotted disk called the encoder disk passes between a light source and two photosensors The position of the carriage frame can be determined by counting the pulses generated by the photosensors In the same way the rotation of the space motor can be recognized and controlled by measuring the phase relationship and the pulse width of the signals generated by the photosensors Pring Head Carriage Shaft er Encoder disk s Encoder Sensor f Sler Guide ral Copyright 1997 Okidata Division of OKI Americ
17. power cord 3 Detach the interface cable if installed 4 P N 56609701 Cord AC RSPL P N 56624101 Cord AC 220V ML Series Right Angle Option RSPL P N 56624401 Cord AC 240V Option RSPL P N 70000803 Kit Parallel Interface Option Plug n Play Accessory P N 70012801 Kit RS232 C Serial Interface Option Both Both Both Both Both B 2 02 B 2 02 B 2 07 B 2 07 B 2 07 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com OKIDATA Page 94 Service Guide ML590 ML591 Chapter 3 Maintenance amp Disassembly 3 2 02 Printhead Assembly 1 Perform this procedure 3 2 01 4 2 Open the access cover 1 3 Lift and remove the ribbon Not shown 4 Pull the head clamp 2 towards the right and then rotate it up to release the printhead 3 5 Pull the printhead straight up to remove it NOTE Installation After installing the printhead check the printhead gap adjustment Refer to Section 3 3 of this Service Handbook i P N 52106001 Ribbon Black Consumable Both P N 52106002 Ribbon Color Consumable Both P N 50707401 Clamp Head RSPL Both P N 50217201 Assembly Printhead RSPL Both B 2 09 B 2 09 B 2 06 B 2 02 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any
18. to the idle gear to the change gear and to the push tractor shaft Cui sheet detecvon switch Main PCB m L ri l LANEN AN L Borron 7 Change ewer NN Tractor gear Plaien gear A idle gear ___ Change ead Grivwe gear y Boram tractor unit 2 i Reset spring Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 80 Ww Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation Cut Sheet Paper Feed Operation As the line feed motor rotates power is transferred through decelerating gears line feed idler gear platen gear to the platen When using cut sheet paper the change lever must be in the TOP position so the platen and pressure rollers can feed the paper This also disengages the push tractor Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 81 OKIDATA Service Guide ML590 ML591 B Chapter 2 Principles of Operation Continuous Paper Feed Rear Tractor Mechanism As the platen rotates power is transferred to the tractor gear from the platen gear the idler gear and the change gear The tractor gear drives the pin tractor belts which feed the continuous paper
19. 6 18 Print Method 26 rer Printhead Gap Information 27 1 6 19 Print Modes 28 1 6 20 Print Speed 29 1 7 Paper Specifications 30 1 8 Memory Specifications 31 1 9 Consumables 32 1 10 Options 33 1 10 01 Cut Sheet Feeders 34 1 10 02 Pull Tractor Kit 35 1 10 03 Color Ribbon Kit 36 1 10 04 Bottom Push Tractor Kit 37 1 10 05 Serial Interface 38 1 10 06 Roll Paper Stand 39 1 10 07 Bitstream Facelift 2 0 40 Table of Contents Page 1 10 08 OKISmart Typer Utility 41 1 10 09 OKISmart Panel Utility 42 1 11 Reliability 43 2 Principles of Operation 2 1 Electrical Operation 44 2 1 02 Main Control Board 45 Pee Block Diagram 46 EP Program ROM 47 ae RAM 48 eae Character Generator ROM CG ROM 49 EN Electrically Erasable Programmable ROM EEPROM 50 LSI 51 2 1 03 Initialization 52 2 1 04 Parallel Interface Control 53 2 1 05 Print Control 54 re LSI Printhead Interface 55 n Gap Adjust Control 56 PERO Print Compensation Control 57 2 1 06 Space and Line Feed SP LF Motor Control 58 PAPE Line Feed Motor Control 59 ued space Motor Control 60 ES Encoder Disk 61 2 1 07 Operation Panel 62 2 1 08 Alarm Circuit 63 aves Head Drive Time 64 n Print Speed 65 PA Head Overheat Alarm Processing 66 2 1 09 Power Supply Circuit 67 2 2 Mechanical Operation 68 2 2 01 Printhead Mechanism 69 ere Interconnect Diagram Control Board to Printhead 70 eee Line Feed Motor Resistance 71 eee spac
20. America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 23 OKIDATA Service Guide ML590 ML591 Chapter 1 Product Specifications 1 6 15 Paper Loading Auto Loading Top Feed Press LOAD switch for Bottom Rear Feed Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 24 OKIDATA Service Guide ML590 ML591 Be Chapter 1 Product Specifications 1 6 16 Paper Out Detection Distance from end of paper Rear Feed 0 5 inches 12 7 mm Bottom Feed 0 5 inches 12 7 mm Top Feed 0 5 inches 12 7 mm Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 25 OKIDATA Service Guide ML590 ML591 Chapter 1 Product Specifications 1 6 17 Paper Tear Capabilities Forms Tear Off sharp edge on access cover Metal Tear Bar with optional bottom tractor unit Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 26 OKIDATA Service Guide ML590 ML591 7 Chapter 1 Product Specifications 1 6 18 Print Method Printhead Type General I
21. Chapter 3 Maintenance amp Disassembly 3 2 23 Idle Gear and Change Lever 1 Perform these procedures 3 2 01 sn 3 2 06 i 3 2 07 i 3 2 16 ii 3 2 17 E 3 2 19 i 3 2 20 i 3 2 22 i 2 Remove the idle gear 1 The idle gear is a large narrow gear 3 Release the claw 2 of the change lever 3 The claw is accessed from inside the unit 4 Remove the change lever
22. DATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 64 Ww Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation Head Drive Time The head drive time is modified to compensate for the amount of the voltage drop of the POWLEV signal By monitoring the voltage drop every 500 microseconds the MPU is able to control and maintain the impact necessary for each printhead pin Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 65 C Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation Print Speed Actual Voltage 40 vdc Passes Relative Print Speed Required 34 vdc or greater 100 32 vdc to 34 vdc Approximately 85 30 vdc to 32 vdc Approximately 50 30 vdc or less Less than 50 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 66 8 Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation Head Overheat Alarm Processing Two thermistors are used to monitor the printhead temperature One is contained in the printhead and the other in the printhead driver The voltage of the TSD signal is monitored at the MPU A D port to control the pass number a
23. EAN 13 Interleaved 2 of 5 Code 128 POSTNET Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 13 OKIDATA Service Guide ML590 ML591 Chapter 1 Product Specifications 1 6 05 Printer Emulations Note The emulations are co resident Epson LQ IBM XL 24E AGM IBM Proprinter Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 14 OKIDATA Service Guide ML590 ML591 Chapter 1 Product Specifications 1 6 06 Fonts Letter Quality Courier Letter Gothic Prestige Orator Roman Swiss Draft Utility High Speed Draft 15 cpi Bar Code Code 39 UPC A UPC E EAN 8 EAN 13 Interleaved 2 of 5 Code 128 POSTNET Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 15 OKIDATA Service Guide ML590 ML591 Chapter 1 Product Specifications 1 6 07 Front Panel Switches Select Micro Feed Up Down Menu Mode Paper Park Line Feed Pitch Selection Form Feed Print Quality Selection Top of Form Tear Quiet Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Busine
24. Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 7 OKIDATA Service Guide ML590 ML591 l Chapter 1 Product Specifications 1 4 ENVIRONMENTAL CONDITIONS 1 4 01 Acoustic Rating Letter Quality Mode 53 dBA Quiet Mode 50 dBA 1 4 01 Altitude 10 000 feet 3 050 meters 1 4 03 Ambient Temperature and Relative Humidity RH While operating 41 to 104 F 5 to 40 C Operating humidity 20 to 80 RH While in storage 14 to 122 F 10 to 50 C Storage humidity 5 to 95 RH Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 8 te Service Guide ML590 ML591 OKIDATA Chapter 1 Product Specifications 1 5 AGENCY APPROVALS 1 5 01 Listings UL No UL Standard No 1950 CSA No CSA Standard 22 2 950 FCC FCC Certified per Part 15 Subject J Class B IEC IEC 950 VDE VDE 0805 VDE 0875 Class B BS BS 7002 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Service Guide ML590 ML591 OKIDATA Chapter 1 Product Specifications 1 6 01 Character Matrix Sizes Table of Print Speed and Character Matrix 120 12 cpi
25. Page 1 Service Guide ML590 ML591 Chapter 0 About This Manual OKIDATA Service Manual ML590 ML591 Dot Matrix Printers Adobe Acrobat printable reference copy of the OKIDATA Service Training Manual 09 17 97 Note This Adobe Acrobat version of the Okidata Service Training Manual was built with the pictures rendered at 300 dpi which is ideal for printing but does not view on most displays well Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Table of Contents Page Service Guide ML590 ML591 0 About This Manual Front Cover Copyright 2 Part Number amp Manual Revision 3 1 Product Specifications 1 1 General Information 4 1 2 Physical Specifications 5 1 3 Power Requirements 6 1 4 Environmental Conditions 7 1 5 Agency Approvals 8 1 6 Operation Spec s Print Speed and Character Matrix 9 1 6 02 Characters Per Line 10 1 6 03 Character Pitches 11 1 6 04 Character Sets 12 1 6 05 Printer Emulations 13 1 6 06 Fonts 14 1 6 07 Front Panel Switches 15 1 6 08 Graphics Resolution 16 1 6 09 Interface 17 1 6 10 Line Feed Increments 18 1 6 11 Line Feed Time 19 1 6 12 Menu Mode 20 1 6 13 Paper Feed Methods 21 1 6 14 Paper Feed Paths 22 1 6 15 Paper Loading 23 1 6 16 Paper Out Detection 24 1 6 17 Paper Tear Capabilities 25 1
26. Rear Rear Pressure Roller Pressure Roller Roller OPEN NIA OPEN NIA Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 79 a Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation Cut Sheet Continuous Sheet Switching Mechanism Top Feed for cut sheet paper When cut sheet paper is used place the change lever in the Top Feed position As the platen turns the platen gear causes the idle gear to rotate At this time the rear and front pressure rollers press against the platen and feed the cut sheet The cut sheet detection lever enables the cut sheet detection switch which is located on the main control board This places the printer in the cut sheet mode When cut sheet paper is placed between the platen and the paper chute the printer automatically feeds the sheet to the print start position Rear Bottom Feed for continuous feed paper When the continuous feed paper is used either with the rear tractor optional bottom tractor or optional pull tractor place the change lever in the Rear Bottom Feed position When the change lever is placed in this position the reset spring pushes the change gear In this position the idle gear is engaged with the bottom tractor unit drive gear and the tractor gear As the platen turns power is transferred from the platen gear
27. TA Service Guide ML590 ML591 a Chapter 3 Maintenance amp Disassembly 3 2 15 Guide Rail and Adjust Cam 1 Perform these procedures 3 2 01 ai 3 2 02 04 i a 2 02 3 2 04 3 2 11 2 14 2 2 2 3 2 2 Rotate the adjust cam 1 in the direction of arrow A as far as possible 3 Pull the cam out and remove it 4 Carefully press the claw 2 location only in the base frame down to release the guide rail 3 Do not press too hard or the claw will break 5 Use a straight slot screwdriver to slide the guide rail in direction of arrow A 6 Lift the guide at position B and work the other end of the guide free to remove the guide rail 7 Remove the ground clip 4 NOTE Installation After installing the guide rail check the printhead gap adjustment Refer to Section 3 3 of this Service Handbook __ P N 51009701 Guide Rail Ground Clip RSPL Both B 2 03 P N 51009801 Guide Rail Narrow RSPL 590 B 2 03 i P N 51009901 Guide Rail Wide RSPL 591 B 2 03 5 P N 53067701 Cam Adjust RSPL Both B 2 034J Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 108 OKIDATA Service Guide ML590 ML591 Chapter 3 Maintenance amp Disassembly 3 2 16 Left Ground Plate 1 Perform these procedures 3 2 01 FEHI 3 2 06 3 2 07
28. a Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 75 al F A Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation 2 2 03 Head Gap Mechanism The head gap is automatically set for the thickness of the medium loaded in the printer In the case of envelopes where the medium thickness varies as the printhead moves along the platen the head gap changes to compensate for the differences in thickness Head Gap Setting Operation Once printing starts the space motor rotates the ribbon gear causing idle gear C to turn the change gear When the MPU requests a change in the head gap setting the GAP P signal causes the armature which is holding the change gear to be attracted to the pranger magnet The gap reset spring can now push the change gear so it contacts the gap change gear The rotation of the gap change gear causes idle gear D to turn the adjust gear The adjust gear turns the adjusting screw resulting in a new head gap setting Note As the adjusting screw turns counter clockwise the gap narrows As the adjusting screw turns clockwise the gap widens Barras E Printhead t Adjusting gear as te i Cow lin Guide rail te ne There is a cam at each setting of the gap change gear When the change gear is at the top of the cam the change gear disengages from the gap change gear At this ti
29. age 112 OKIDATA Service Guide ML590 ML591 t Chapter 3 Maintenance amp Disassembly 3 2 20 Paper Chute Assembly 1 Perform these procedures 2 Remove the rear pressure roller 1 3 Use a straight slot screwdriver to release the claws of the lock spring 2 and remove the spring 4 Remove the paper chute assembly 3 NOTE The paper chute assembly includes the levers for the rear and top paper feed paths P N 53341301 Roller Pressure Rear Narrow RSPL 590 B 2 05 5 P N 53341401 Roller Pressure Rear Wide RSPL 591 B 2 05 P N 50924701 Spring Lock RSPL Both B 2 05 P N 50097701 Paper Chute Assembly N RSPL 590 B 2 05 5 P N 50097801 Paper Chute Assembly W RSPL 591 B 2 05 i Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 113 OKID AT A Service Guide ML590 ML591 X Chapter 3 Maintenance amp Disassembly 3 2 21 Line Feed Motor Assembly 1 Perform these procedures 3 2 01 i 3 2 06 i 3 2 07 i 3 2 16 ii 3 2 20 i 2 Firmly press down on the line feed motor assembly 1 while tilting the assembly out 3 Remove the line feed motor assembly 4 Remove the line feed connection cord 2 CAUTION The line feed idle gear 3 should be removed only if it must be replaced The claws will break when the gear is removed A new gear must be instal
30. ange BPX for any updates to this material http bpx okidata com Page 38 OKIDATA Service Guide ML590 ML591 Chapter 1 Product Specifications 1 10 05 Serial Interface Super Speed 19 2K RS 232C Ready Busy X On X Off Protocols Can be configured through the Menu or OKISmart Utility Program Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 39 OKIDATA Service Guide ML590 ML591 Ev Chapter 1 Product Specifications 1 10 06 Roll Paper Stand Adapts printer for use with roll type paper Model 590 only Includes Stand Support Cord and DIN plug for connection to printer Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 40 OKID AT A Service Guide ML590 ML591 Chapter 1 Product Specifications 1 10 07 Bitstream Facelift 2 0 For Windows 3 0 and 3 1 Includes 14 scalable fonts Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 41 amp Service Guide ML590 ML591 OKIDATA Chapter 1 Product Specifications 1 10 08 OKISmart Typer Utility Packaged with printer Includes Typewriter Mode Form Crea
31. ble Programmable ROM EEPROM Location 03C 930846 The EEPROM is a CMOS serial I O type memory which is capable of electrically erasing and writing 1 024 bits The EEPROM contains the menu data and the head drive time correction data EEPROM Write cycle timing WRITE Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 51 Ww Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation LSI Location 02D MSM 79V035 Detects the output of the two phase sensor on the DC space motor to control the motor drive phase Transmits and receives serial data to and from the printhead based on the dot timing which is derived from the space motor speed Controls the external interface The LSI is connected to the MPU Clockout AD Atg a Qletkeul i provided when the original encliation is jelected Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 52 AW Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation 2 1 03 Initialization This printer is initialized when the printer is powered on or when the I PRIME N signal is input from the host via the parallel interface Printer Initializati
32. ct sequence may result in damaged parts Since screws collars and other small parts are easily lost they should be temporarily attached to the Original positions When handling circuit boards use extreme care Integrated circuits microprocessors ROM and RAM can be destroyed by static electricity Do not place printed circuit boards directly on conductive surfaces Follow the recommended procedures when replacing assemblies and units Perform the printhead gap adjustment procedure Refer to Section 3 3 of this Service Handbook 5 when the any of the following occur Print Quality is darker on one side of the document Parts are replaced Printhead 3 2 02 Space Motor Assembly 3 2 11 Space Rack 3 2 13 Guide Rail 3 2 15 Platen Assembly 3 2 19 Carriage Shaft 3 2 25 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 92 OKIDATA Service Guide ML590 ML591 e es Chapter 3 Maintenance amp Disassembly 3 2 DISASSEMBLY ASSEMBLY PROCEDURES General Information This section contains the printer disassembly procedures Only the removal procedures are explained here Reverse the procedure for the installation At the bottom of each procedure is a listing of the parts covered in that procedure The Okidata part number item description comment RSPL Option Con
33. e BPX for any updates to this material http bpx okidata com Page 35 OKIDATA Service Guide ML590 ML591 Chapter 1 Product Specifications 1 10 02 Pull Tractor Kit Note The Pull Tractor Kit P N 70023001 is a narrow feeder for the Microline 590 The Pull Tractor Kit P N 70023201 is a wide feeder for the Microline 591 Bottom Feed Rear Feed For Push Pull Operation Paper Types Continuous Feed and Labels Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 36 OKIDATA Service Guide ML590 ML591 Chapter 1 Product Specifications 1 10 03 Color Ribbon Kit Includes Color mechanism Color Ribbon End user installable Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 37 OKIDATA Service Guide ML590 ML591 Chapter 1 Product Specifications 1 10 04 Bottom Push Tractor Kit Note The Bottom Push Tractor Kit P N 70022901 is a narrow feeder for the Microline 590 The Bottom Push Tractor Kit P N 70023101 is a wide feeder for the Microline 591 Bottom Feed Paper Type Continuous Feed Includes Stand and Metal Tear B Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exch
34. e The OkiSmart software includes three programs 1 OkiSmart Control 2 OkiSmart Panel Emulator 3 OkiSmart Setup Refer to the Printer Handbook for more information Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 5 C Service Guide ML590 ML591 OKIDATA Chapter 1 Product Specifications 1 2 PHYSICAL SPECIFICATIONS 1 2 01 Dimensions Note Dimensions INCLUDE the platen knob acoustic cover and paper separator Microline 590 Width 18 35 inches 466 millimeters Depth 17 24 inches 438 millimeters Height 6 52 inches 165 millimeters Microline 591 Width 24 41 inches 620 millimeters Depth 17 24 inches 438 millimeters Height 6 52 inches 165 millimeters 1 2 02 Printer Weight Microline 590 16 5 pounds 6 5 kilograms Microline 591 19 8 pounds 8 9 kilograms Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 6 OKIDATA Service Guide ML590 ML591 Chapter 1 Product Specifications 1 3 POWER REQUIREMENTS 1 3 01 Input Power 120 VAC 5 5 15 230 240 VAC 10 14 1 3 02 Power Consumption Operating 110 VA Idle 40 VA 1 3 03 Power Frequency 120 VAC 60 Hz 2 230 240 VAC 50 60 Hz 2 Copyright 1997
35. e Motor Resistance 72 eah Printhead Operation 73 2 2 02 Spacing Mechanism 74 2 2 03 Head Gap Mechanism 75 2 2 04 Ribbon Drive Mechanism 76 ene Color Ribbon Shift Mechanism 77 2 2 05 Line Feed Mechanism 78 oe Cut Sheet Continuous Sheet Switching Mechanism 79 ones Cut Sheet Paper Feed Operation 80 ene Continuous Paper Feed Rear Tractor Mechanism 81 capes Continuous Paper Feed Pull Tractor Mechanism 82 ere Continuous Paper Feed Bottom Tractor Feed 83 Mechanism Table of Contents Page ones Continuous Paper Feed Push Pull Tractor Mechanism 84 2 2 06 Paper Detection Mechanism 85 2 2 07 Support Protector Mechanism 86 2 2 08 Automatic Paper Load 87 2 2 09 Paper Park 88 3 Maintenance amp Disassembly 3 1 01 General Information 89 3 1 02 Maintenance Tools 90 3 1 03 Maintenance Precautions 91 3 2 Disassembly Assembly Procedures 92 3 2 01 Preliminary Items 93 3 2 02 Printhead Assembly 94 3 2 03 Ribbon Protector 95 3 2 04 Gear Case Assembly 96 3 2 05 Pull up Roller Assembly 97 3 2 06 Upper Cover Access Cover and Sheet Guide 98 Assemblies 3 2 07 Control Board AKGI 99 3 2 08 Power Supply Assembly 100 3 2 09 Operator Panel PCB LEOP 101 3 2 10 PC Connector 102 3 2 11 Space Motor and Roller Guide Assemblies 103 3 2 12 Carriage Cable 104 3 2 13 Space Rack 105 3 2 14 Roller Holder Backup Assembly 106 3 2 15 Guide Rail and Adju
36. er Disk As the space motor operates the encoder disk spins When the encoder disk interrupts the photo sensors the signals Phase A and Phase B are generated The LSI Location 02D MSM79V035 divides these edge pulse signals the frequency division is based on the selected print pitch to generate the signal IPT The IPT signal provides dot on timing and carriage position detection timing Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 62 r 6 Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation 2 1 07 Operation Panel The Serial I O Port Ports 20 23 of the MPU reads the operation panel switch data from the operation panel control LSI Location IC1 BUS148S The Serial I O Port also outputs LED data to the operation panel control LSI A two byte 15 bits 1 parity bit even parity command OPTXD is transmitted from the MPU to the operation panel LSI in synchronization with the OPCLK signal Once the LSI decodes the command the command must pass a command code check and have no parity errors Then the specified I O control will return the two byte command response to the MPU i OPTXD l QPEL Ka I P22 Command P23 a latch LED Driwir OPRXO controller of S lt E a ie ae Y amp gt af a re oo Command iari a
37. ess 0 014 inches 0 36 millimeters Rear Feed 0 017 inches 0 44 millimeters Bottom Feed Paper Feed Path Printhead Gap Rear or Bottom Information Refer to the Printhead Gap Information Section 1 6 43 Cut Sheet Weight 12 to 24 Ibs 45 to 90 g m2 Width 7 2 to 14 3 inches 18 3 to 36 3 centimeters Width Microline 590 7 2 to 8 5 inches 18 2 to 21 5 centimeters Microline 591 7 2 to 14 3 inches 18 2 to 36 3 centimeters Length 3 to 17 inches 7 62 to 43 18 centimeters Thickness 0 014 inches 0 325 millimeters Maximum Paper Feed Path Printhead Gap Top Information Refer to the Printhead Gap Information Section 1 6 i Envelopes Weight 24 Ibs 90 g m2 Maximum Size Labels Single Feed Minimum 6 5 x 3 6 inches 16 5 x 9 1 centimeters Maximum 9 5 x 4 1 inches 24 1 x 10 4 centimeters Continuous Non overlap type Thickness 014 inches 325 millimeters Maximum Paper Feed Path Bottom Printhead Gap Information Refer to the Printhead Gap Information Section 1 6 43 Weight N A Width Microline 590 3 5 to 10 5 inches 8 8 to 26 6 centimeters Microline 591 3 5 to 16 5 inches 8 8 to 41 9 centimeters Length 3 to 17 inches 7 62 to 43 18 centimeters Thickness 011 inches 0 28 mm Maximum including backing Paper Feed Path Bottom Printhead Gap Information Refer to the Printhead Gap Information Section 1 6 4 CAUTION Use Bottom Feed and or optional Pull Tractor for card stock and labe
38. g circuit to the LSI This information is used to determine the optimum drive time for the next print request The logic circuit of the printhead signals the LSI if a parity error is detected in the print data HOS RATA DX ODOT CET _lwk TL OO E ERA Normal es 1 as A ae ERA l parity error ee Ee a Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 56 OKIDATA Service Guide ML590 ML591 i Chapter 2 Principles of Operation Gap Adjust Control The Gap Adjust LSI receives stroke length information for all of the printhead pins from the sensor analog circuit The Gap Adjust LSI then sets the optimum printhead gap for the printing medium Note Refer to Section 2 2 03 for a description of the mechanical process All values in the chart are in millimeters Power in Tentai petting at gap raage g Printiretructian Pretminary printing l3 hap tange at 6 ov above Prekiurd DEncitive pipe ig SP or more Intecleat papar ig AP or ricer Envelope AAPropsiate Gap vetting gap levels 6 7 Band 9 Appropreta gap eetiong gap levels 1 2 3 4 ane F Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page
39. ial http bpx okidata com Page 84 OKIDATA Service Guide ML590 ML591 B Chapter 2 Principles of Operation Continuous Paper Feed Push Pull Tractor Mechanism This mechanism consists of an optional pull tractor and a standard push tractor mechanism Continuous paper is fed by these two tractors at the same time i Plaen wrar i baren Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 85 al F A Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation 2 2 06 Paper Detection Mechanism Top Feed Paper Detection When the cut sheet paper is inserted into the printer Point A of Paper Near End Lever B is pushed backward rotating Paper Near End Lever A As Paper Near End Lever A rotates it contacts the Rear Sensor Lever rotating it The Rear Sensor Lever rotates unblocking the Rear Top Paper End Sensor Rear Feed Detection When paper is fed from the rear push tractor Point B is pushed backward rotating Paper Near End Lever A As Paper Near End Lever A rotates it contacts the Rear Sensor Lever rotating it The Rear Sensor Lever rotates unblocking the Rear Top Paper End Sensor Paper near end lever B Rear and Top paper end sensor Paper near end lever A Point Bottom Feed Detection When the paper is fed from the bottom of the pr
40. ight 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 33 Ae Service Guide ML590 ML591 OKIDATA Chapter 1 Product Specifications 1 10 OPTIONS Cut Sheet Feeders B Pull Tractor Kit RA Color Ribbon Kit aa Bottom Push Tractor aa Serial Interface G Roll Paper Stand G Bitstream Facelift 2 0 2 OKlIsmart Typer Utility a OKlsmart Panel Utility a Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 34 OKIDATA Service Guide ML590 ML591 i wr l Chapter 1 Product Specifications 1 10 01 Cut Sheet Feeders The CSF 5000 is a narrow feeder for the Microline 590 Single Bin with envelope capability Paper Width 7 2 to 8 5 18 3 cm to 36 3 cm Paper Length 10 1 to 14 25 6 cm to 35 6 cm Capacity 170 sheets 16 Ib 100 sheets 20 Ib The CSF 5001 is a wide feeder for the Microline 591 Single Bin with envelope capability Paper Width 7 2 to 14 3 18 3 cm to 36 3 cm Paper Length 10 1 to 14 25 6 cm to 35 6 cm Capacity 170 sheets 16 lb 100 sheets 20 Ib Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchang
41. ignal will cause all DC voltages to be turned off Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com OKIDATA Service Guide ML590 ML591 Chapter 2 Principles of Operation Page 68 2 2 MECHANICAL OPERATION The following section explains the mechanical operation of the printer Spacing Mechanism ccsssicevinnencertansenrecnienneaies Head Gap Mechanism Ribbon Drive Mechanism ecese Line Feed Mechanism _ c seeceeeeeeeeeeeeens Paper Detect Mechanism Support Protector Mechanism Automatic Paper Load ceeceeeeeeeeeeeees Paper PaK scenar n serene BEEEEEGEE Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 69 Ww Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation 2 2 01 Printhead Mechanism The printhead is a spring charged 24 pin printhead It is attached to the carriage which moves parallel to the platen Electrically the printhead is controlled by the main control board via the carriage cable and the space motor Arrangement of the head pins View from the tip of the printhead Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Part
42. iness Partner Exchange BPX for any updates to this material http opx okidata com Page 4 OKIDATA Service Guide ML590 ML591 ft err Chapter 1 Product Specifications 1 1 01 General Information The Microline 590 and Microline 591 are letter quality dot matrix printers which utilize OKISMART paper handling Patented Okidata technology does away with the manual head gap adjustment The Microline 590 591 actually reads and learns the media you feed in then automatically adjusts the head gap to the optimum distance This auto gapping process leads to longer printhead life An optional user installable Color Kit coupled with a customer provided color software package allows the printers to add impact to graphics charts transparencies and text presentations Additional options include the Bottom Feed Push Tractor Cut Sheet Feeder Pull Tractor and Serial Interface Board The Microline 590 is an 80 column printer The Microline 591 is a 132 column printer Okidata s extended two year limited warranty covers the parts labor and printhead on both printers The following items are included with the printer OKISMART Typer software which provides the flexibility for the Microline 590 591 to function like a typewriter on checks labels and envelopes OKISMART Panel a utility program that lets you control selected printer functions from your personal computer Scalable Fonts 14 scalable fonts available on diskette Not
43. inter Point C is pushed rotating the Bottom Paper End Lever As the Bottom Paper End Lever rotates it contacts and rotates the Bottom Sensor Lever The Bottom Sensor Lever rotates unblocking the Bottom Paper End Sensor Note The method for detecting a paper end condition is in the reverse order that is paper end is detected when the Paper End Sensor is blocked Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 86 OKIDATA Service Guide ML590 ML591 l Chapter 2 Principles of Operation 2 2 07 Support Protector Mechanism During printer initialization the support protector is latched in the stored position approximately 5 mm from the left bracket of the main frame Just before paper is loaded the printhead moves towards the left bracket and unlatches the support protector As the printhead moves to the right the support protector reset spring pushes the support protector toward the center of the platen With the support protector in this position the ribbon protector and the support protector prevent the leading edge of the paper from curling or folding Once the paper is ejected the printhead slowly moves towards the left bracket The support protector is latched in the stored position when it is pushed to approximately 5 mm from the left bracket te About Srii Laja
44. ition causes the line feed operation to stop The line feed operation stops because the printer assumes a jam has occurred The operator can press the SEL switch to reset the ALARM LED and press the PARK switch to continue the park operation This operation may be useful when length of the paper to be parked is greater than 19 inches Paper end detection Reverse LF from P E Sensor to tri LF action Reverse LF until paper end or 19 inches max Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 89 OKIDATA Service Guide ML590 ML591 Chapter 3 Maintenance amp Disassembly 3 1 01 General Information This section lists the parts replacement adjustment cleaning lubrication and shipping procedures Disassembly should not be performed unless absolutely necessary NEVER perform disassembly on a malfunctioning printer until you have followed the failure analysis procedures in Section Four of this Service Handbook i Follow the procedures listed in Adjustments and Service Settings 4 Adjustments may be required when either consumable or parts are replaced Failure to perform these procedures could result in unnecessary service calls Proper performance of maintenance and cleaning will help to achieve the best possible print quality from the printer Copyright 1997 Okidata
45. kidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 48 OKIDATA Service Guide ML590 ML591 By Chapter 2 Principles of Operation RAM Location 05E 5116642 The RAM is CMOS dynamic RAM with 65 536 words x 16 bit configuration and is used as a receive buffer print buffer and work buffer ep Read WAH WAL Co D7 Di fr Write verita E bit hus byte instruction ag ae ast mari c aeee a ee aaea eee e LH matute Chockout is prowided when the original excitation ii sebected Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 49 Ww Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation Character Generator ROM CG ROM Location 05C 27C4096 This 256k x 16 bits 4 Mbit masked EPROM contains the character data for the various fonts The CG ROM is assigned to the program memory area of the MPU The data is accessed by the PSEN signal of the MPU Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 50 Ww Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation Electrically Erasa
46. led P N 51228401 Gear Line Feed Idle RSPL Both B 2 03 5 P N 56510301 Motor Line Feed Assembly RSPL Both B 2 03 7 P N 56627201 Cord Connection Line Feed RSPL Both B 2 03 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 114 OKIDATA Service Guide ML590 ML591 a a Chapter 3 Maintenance amp Disassembly 3 2 22 Reset Spring CAUTION Please read through this entire procedure before performing tt Do not press against the vertical extensions of the reset spring at any time during this procedure Firm pressure will release the spring not brute force 1 Perform these procedures 3 2 06 i 3 2 17 8 2 Place the right side of the unit over the edge of your work surface You must be able to access the bottom of the unit You will be working underneath and above the reset spring 1 at the same time 3 Reach from underneath the unit and press up at the extension A to free the spring from the claw 4 While pressing up slide the spring out in the direction of Arrow B and remove it P N 50923201 Spring Reset RSPL Both B 2 044 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 115 OKIDATA Service Guide ML590 ML591
47. ls Transparency 1 7 02 1 7 03 1 7 04 1 7 05 Note Roller marks may mar the transparency under high temperature high humidity conditions Weight 12 to 24 Ibs 45 to 90 g m2 Width Microline 590 7 2 to 8 5 inches 18 2 to 21 5 centimeters Microline 591 7 2 to 14 3 inches 18 2 to 36 3 centimeters Length 3 to 17 inches 7 62 to 43 18 centimeters Thickness 0 14 inches 0 36 millimeters Paper Feed Path Top Printhead Gap Information Refer to the Printhead Gap Information Section 1 6 43 Length Note The recommended length is specific to paper type Rear Feed Minimum 3 inches 7 62 centimeters Maximum 17 inches 43 18 centimeters Bottom Feed Minimum 3 inches 7 62 centimeters Maximum 17 inches 43 18 centimeters Top Feed Minimum 3 inches 7 62 centimeters Maximum 17 inches 43 18 centimeters Number of Copies Original 4 Interleaf Original 4 Carbonless Original Cut Sheet Thickness 0 014 inches 0 36 mm Maximum Thickness Rear Feed 0 017 inches 0 44 mm Maximum Thickness Bottom Feed Weight Note The recommended weight is specific to paper type Minimum 9 Ib 35 g m2 Maximum 24 Ib 90 g m2 1 7 06 Width Note The recommended width is specific to paper type Paper Microline 590 Minimum 3 5 inches 8 8 centimeters Maximum 10 5 inches 26 6 centimeters Microline 591 Minimum 3 5 inches 8 8 centimeters Maximum 16 5 inches 41 9 centimeters Printing Area Microline 590 8 inches Ma
48. mbly 186 A 2 04 Space Motor Board 187 A 2 05 RS232 C Serial Interface Board LXHI Option 188 B Illustrated Parts Listing General Information 189 B 1 02 Definition of Terms 190 B 1 03 Parts Ordering Information 191 B 2 Charts 192 Board Overview 193 B 2 01 Printer 194 B 2 02 Upper Cover Assembly 195 B 2 03 Printer General Assembly 196 B 2 04 Printer Unit 1 of 3 197 B 2 05 Printer Unit 2 of 3 198 B 2 06 Printer Unit 3 of 3 199 B 2 07 Carriage Assembly 200 B 2 08 Options 201 B 2 09 Option Parts 202 B 2 10 Consumables 203 B 2 11 Packing Materials 204 B 2 12 Documentation 205 B 2 13 Service Training Kit Revision List 206 Page 2 OKIDATA Service Guide ML590 ML591 i Chapter 0 About This Manual This document may not be reproduced without the written permission of the Okidata Technical Training Group Every effort has been made to ensure the accuracy of the information contained in this training course Okidata is not responsible for errors beyond its control Written and produced by the Okidata Technical Training Group Please address any comments on this publication to Technical Training Group Okidata 532 Fellowship Road Mount Laurel NJ 08054 3499 Fax Number 609 235 2600 ext 7034 Okilink Login Name Technical Training OKIDATA is a registered trademark of Oki Electric Industry Company Ltd marques deposee de Oki Electric Industry Compa
49. me the armature resets changing the head gap by one setting The head gap is modified in 06 mm units for each range setting idhe gear Ribbon gear Ariat ine Gap change gear idl gear D Adjust gear Change gear Pranger magnet Anmane Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 76 OKIDATA Service Guide ML590 ML591 Chapter 2 Principles of Operation 2 2 04 Ribbon Drive Mechanism Black Ribbon Drive Operation The ribbon drive mechanism feeds the ribbon in synchronization with the spacing operation The force required to drive the ribbon is obtained from the space motor The ribbon drive mechanism is composed of the following items Ribbon drive gear assembly Ribbon gear located on the space motor assembly Ribbon cartridge Ribbon drive poar assembly I Ribbon geai apace Motor Asiembly fa A continuous loop ribbon with uni directional feed is used Ink is supplied from an ink tank which is built into the ribbon cartridge When the space motor turns the ribbon gear on the spacing motor shaft rotates The rotation is transmitted via a combination of gears from the ribbon drive gear assembly to the drive gear in the ribbon cartridge Although the space motor moves in both the forward and reverse directions during bi directional printing the gear
50. nd print method unidirectional bi directional at each of seven levels If the printhead temperature exceeds 110 degrees Celsius the printer will switch to unidirectional print If the temperature exceeds 115 degrees Celsius printing will stop Once the printhead cools printing will resume 7 PASS Unidirectional e1 PASS Unidirectional print Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 67 OKIDATA Service Guide ML590 ML591 Chapter 2 Principles of Operation 2 1 09 Power Supply Circuit The switching type power supply circuit supplies the 5 vdc 8 vdc 12 vdc and 40 vdc f a Be ee oe mm oa omm Ss a on nama on sm a m e m a aE e te ie te ee 2 E T T ACIN SW i J jeo Noise filter 40 primary i Fuse circuit switching circuit E Switehing control circuit Rectification and 40 smoothing circuit Alarm control Condit te vlad Rectification and 3 switching circuit regulating circuit i i i ae Rectification and 7 smoothing cirewit am ammm M l o a a a a l ee eee e E e Table of Output Voltages Printhead analog circuit Printhead space motor and line feed motor drive voltage ALM Output from the main control board upon detection of an abnormality in the printhead head gap or color ribbon drive circuits This s
51. ner Exchange BPX for any updates to this material http bpx okidata com Page 70 OKIDATA Service Guide ML590 ML591 Chapter 2 Principles of Operation Interconnect Diagram Control Board to Printhead Note The printhead coil resistance values ARE NOT LISTED The individual print wire control lines CANNOT be accessed on this printhead Signal Connector pin number HOSLT N HOSDATA N HOSCLE N CLK ERR Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 71 ae Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation Line Feed Motor Resistance The resistance of each coil should be approximately 13 ohms Pin number f A mambe LF Motor Conmector pin mumba a SS i e A e i Re Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 72 AF A Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation Space Motor Resistance The resistance of each coil should be approximately 5 ohms Pin number of SP Motor Connector pin number I gP J SPY 4 SPW 10 PHASE A g PHASE a 5V 11 EL Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner
52. nes how the printhead gap is set The settings are listed below Auto Gap Semi Auto Gap 1 2 3 4 5 6 7 8 9 An explanation of each setting follows Auto Gap This is the factory default Automatically determines paper thickness of the first page During single sheet feed each page s thickness is checked while a job is printing Semi Auto Gap Similar to Auto Gap Automatically determines paper thickness of the first page During single sheet feed each page s thickness IS NOT checked while a job is printing 1 2 3 4 5 6 7 8 9 Used when the same paper is used ALL of the time Bypasses the automatic head gap adjustment 1 is the narrowest gap setting 9 is the widest gap setting PowerOn Tentatve setting at gap range 3 Printinstruction Preliminary printing Max Thickness mm Preuure pensite paper ii SP or more Interioa paper is AP or aie Appropriate gap PE setting gap levels amp 7 Band 9 Appropriate gap setting gap levels 1 2 4 4 and 5 a Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 28 OKID AT A Service Guide ML590 ML591 Chapter 1 Product Specifications 1 6 19 Print Modes Letter Quality Utility High Speed Draft Copyright 1997 Okidata Division of OKI America Inc All rights reser
53. nformation Impact Dot Matrix 24 pin printhead 0079 inch 20 millimeter diameter pins Overheat Protection When printhead temperature exceeds 110 degrees Celsius the printer stops bi directional printing Uni directional printing begins If the temperature exceeds 115 degrees Celsius printing stops Printing will resume when the printhead temperature drops below 115 degrees Celsius Note Refer to Section Two for more information on printhead operation Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 27 al Fae Service Guide ML590 ML591 OKIDATA Chapter 1 Product Specifications Printhead Gap Information Three items factor into printhead gap information 1 Printhead Gap Adjustment This is a SERVICE ADJUSTMENT made by a technician It is covered in Section 3 3 of this Service Handbook The Adjustment measures 0 014 0 001 inches 0 35 0 03 mm 2 Printhead Gap Adjust This is a MENU ITEM in the SET UP Group lt fine tunes the automatic setting of the printhead gap The settings are 0 1 and 1 0 is the factory default Use 1 to darken print if output is consistently light Use 1 to lighten print if output is consistently dark 3 Gap Control This is a MENU ITEM in each Paper Feed Group The Groups are REAR FEED BOTTOM FEED and TOP FEED Gap Control determi
54. ny Ltd marca registrada Oki Electric Industry Company Ltd MICROLINE is a registered trademark of Oki Electric Industry Company Ltd marque depose de Oki Electric Industry Company Ltd OkiSmart Paper Handling is a trademark of Oki Electric Industry Company Inc PLUG n PRINT is a registered trademark of Oki America Inc marque deposee de Oki America Inc Bitstream is a registered trademark of Bitstream Incorporated Epson is a registered trademark of Seiko Epson Corporation IBM is a registered trademark of International Business Machine Corporation MS DOS is a registered trademark of Microsoft Corporation PC is a registered trademark of International Business Machine Corporation Proprinter is a registered trademark of International Business Machine Corporation Windows is a trademark of Microsoft Corporation Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 3 OKIDATA Service Guide ML590 ML591 wr l Chapter 0 About This Manual 1994 by Okidata All rights reserved First Edition October 1992 P N 59256301 Second Revision March 1993 Third Revision August 1993 Second Edition April 1994 P N 59256302 Fourth Revision April 1994 Third Edition November 1994 P N 59256303 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Bus
55. on occurs as listed below The RST N signal is output from the Reset circuit to reset the MPU and LSls The program is executed and the LSIs are reset by the MPU via IORST N Note A Reset operation initiated by I PRIME does not reset the MPU The program sets the LSI 02D mode checks the memory ROM RAM then executes carriage homing and determines the phase of the line feed motor Finally the program establishes the interface signals P I F ACK P signal sending and S I F BUSY N signal off and lights the SELECT lamp to indicate that the printer is in the ON LINE state MPU LSI Resetting and Initial setting VEBUSYO ROM Check RAM Clear r 1 Carriage Homing IF Motor Phase Initialization Parallel VF VF BUSY OFF Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 53 G Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation 2 1 04 Parallel Interface Control The parallel data input from the host to the interface LSI is latched to the internal register by the falling edge of the STROBE N signal The LSI sets the BUSY N signal to inform the host that the data is being processed The LSI also outputs the RXD N signal to inform the MPU of data reception The data is read upon receiving the RD N signal from the MPU When
56. ontinuous paper feed rate Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 20 OKIDATA Service Guide ML590 ML591 Chapter 1 Product Specifications 1 6 12 Menu Mode Print Prints the entire menu Group Selects Group Function Item Selects Item Set Selects Item Value Exit Exits Menu Mode Enters Select Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 21 OKIDATA Service Guide ML590 ML591 Chapter 1 Product Specifications 1 6 13 Paper Feed Methods Standard Friction Feed Top Rear Push Tractor Rear Optional Pull Tractor Bottom Bottom Push Tractor Bottom Single Bin Cut Sheet Feeder Top CSF 5000 Narrow CSF 5001 Wide Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 22 OKIDATA Service Guide ML590 ML591 Chapter 1 Product Specifications 1 6 14 Paper Feed Paths Top Feed Standard Rear Feed Standard Bottom Feed by using an Optional feed mechanism Special Features Paper Park Automatic Paper Loading Forms Tear Off Copyright 1997 Okidata Division of OKI
57. ontrol The SP LF motor driver Location 5A MHM2025 drives the line feed motor in two phase bipolar based on the phase changeover data output from the LSI The serial data from the LSI O2D MSM79V035 is processed by a register contained in the SP LF motor driver to measure the overdrive time and to change the phase PHASE A PHASE B L P L FORWARD REVERSE Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 60 G Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation Space Motor Control The SP LF motor driver Location 5A MHM2025 drives the three phase brushless motor Motor movement is 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 the pulse width of the output Phase A Phase B of the encoder disk sensor After comparing the target speed for each print mode with the actual speed the motor is accelerated or decelerated to maintain the desired speed for each print mode Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 61 Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation Encod
58. ook CAUTION DO NOT lubricate the space rack Lubricating the space rack will attract dust If enough dust accumulates on the space rack printing problems will occur P N 50923501 Spring Tension Space Rack RSPL Both B 2 03 P N 53563301 Rack Space Narrow RSPL 590 B 2 03 5 P N 53563401 Rack Space Wide RSPL 591 B 2 03 5 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 106 Service Guide ML590 ML591 Chapter 3 Maintenance amp Disassembly OKIDATA 3 2 14 Roller Holder Backup Assembly 1 Perform these procedures 2 Use a small straight slot screwdriver to disengage the claws of the backup roller holder spring 1 from the carriage frame 2 3 Remove the roller nolder backup assembly 3 NOTE The roller nolder backup assembly includes the backup roller 4 the backup roller holder 5 and the pin 6 P N 53343201 Assembly Roller Holder Backup Both B 2 06 5 P N 53341701 Roller Back Up RSPL Both B 2 06 5 P N 53341801 Holder Back Up Roller RSPL Both B 2 06 5 P N N A Pin Both B 2 0643 P N N A Backup Roller Holder Spring Both B 2 06 5 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 107 OKIDA
59. otate the access cover past the vertical when removing it or you will break the tab extensions 8 Raise the access cover assembly 5 until it is vertical then lift it straight up to remove it 9 Remove the sheet guide assembly 6 10 Note the position of the cover B lt for card slot gt 7 This is part of the upper cover and should not be removed No font cards are currently available NOTE When cleaning refer to Section 3 4 of this Service Handbook P N 51009401 Guide Sheet Narrow P N 51009501 Guide Sheet Wide P N 53066901 Cover Upper Narrow P N 53067001 Cover Upper Wide P N 53067101 Cover Access Narrow P N 538067201 Cover Access Wide P N 53067301 Cover B for card slot P N 538562601 Knob Platen ML500 Series Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business RSPL RSPL RSPL RSPL RSPL RSPL RSPL Both RSPL Both 590 591 590 591 590 591 B 2 01 3 B 2 015 B 2 01 3 B 2 01 3 B 2 01 B 2 01 3 B 2 025 B 2 027 Partner Exchange BPX for any updates to this material http bpx okidata com Page 99 Aw Fae Service Guide ML590 ML591 OKIDATA Chapter 3 Maintenance amp Disassembly 3 2 07 Control Board AKGI 1 Perform these procedures 3 2 0168 3 2 06 2 Remove the two screws 1 3 Release the control board AKGI 2 from the bracket 3 4 Tilt the board to access the connectors
60. remove it iN Open eight claws 3 and remove the operator panel PCB LEOP 4 from the operator panel 5 P N 53562701 Panel Operator RSPL Both B 2 02 P N 55937501 PCB LEOP Operator Panel RSPL Both B 2 02 3 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com WAT VAT A Service Guide ML590 ML591 OKIDATA Chapter 3 Maintenance amp Disassembly Page 102 3 2 10 PC Connector 1 Perform these procedures 3 2 01 3 2 0275 3 2 04 2 Remove the two screws 1 3 Remove the PC connector 2 NOTE Installation Do not touch the contacts of the PC connector Do not touch the contacts of the space motor 3 Cleaning When cleaning refer to Section 3 4 of this Service Handbook P N 56729601 Connector PC HD40 RSPL Both B 2 06 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 103 Wit aT A Service Guide ML590 ML591 OKIDATA Chapter 3 Maintenance amp Disassembly 3 2 11 Space Motor and Roller Guide Assemblies 1 Perform these procedures 3 2 0 3 2 02 F 3 2 04 3 2 10 4 2 Remove the three screws 1 3 Lift the space motor assembly 2 4 Remove the left 3 and right connector holders 4
61. s in the ribbon drive assembly maintain uni directional ribbon feed by switching the rotation direction of the gears Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 77 G Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation Color Ribbon Shift Mechanism ltems of the color ribbon unit option are listed below Color shift unit Color ribbon 4 colors Four colors can be selected by sliding the color ribbon holder up or down Here is a description of how the ribbon holder is shifted As the space motor moves idle gear C on the ribbon drive unit rotates Idle gear C rotates the color idle gear located in the color shift unit When the color P signal from the main control board activates the pranger magnet the magnet attracts the armature This causes the reset spring to force the change gear downward The color idle gear rotates the change gear which turns the color change gear The color change gear turns the color cam shaft The rotation of the color cam shaft moves the color ribbon holder up down to select the desired ribbon color There is a cam at each setting of the color change gear When the change gear is at the top of the cam the change gear disengages from the color change gear At this time the armature resets changing the color band selection by one se
62. sensor lever 2 until the flag is at the top then work the lever free P N 50804902 Lever Sensor RSPL Both B 2 03 5 Cut Sheet Continuous P N 50804801 Lever Rear Sensor RSPL Both B 2 03 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 111 OKIDATA Service Guide ML590 ML591 Chapter 3 Maintenance amp Disassembly 3 2 19 Platen Assembly 1 Perform these procedures 3 2 01 E 3 2 06 2 Move the change lever 1 to the bottom feed position to the rear of the printer 3 Push the lock levers 2 in then rotate them towards the front to unlock them from the frame 4 The levers should be vertical 5 Lift the platen assembly 3 straight up and remove it NOTE Installation After installing the platen assembly check the printhead gap adjustment Refer to Section 3 3 of this Service Handbook x Cleaning When cleaning refer to Section 3 4 of this Service Handbook 4 Lubrication When lubricating refer to Section 3 5 of this Service Handbook P N 50098301 Platen Assembly Narrow RSPL 590 B 2 04 P N 50098302 Platen Assembly Wide RSPL 591 B 2 04 5 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com P
63. ss Partner Exchange BPX for any updates to this material http bpx okidata com Page 16 OKID AT A Service Guide ML590 ML591 Chapter 1 Product Specifications 1 6 08 Graphics Resolution Graphics Resolution 360 x 360 DPI maximum Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 17 OKIDATA Service Guide ML590 ML591 Chapter 1 Product Specifications 1 6 09 Interface Standard Parallel Optional RS232C Serial Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 18 OKIDATA Service Guide ML590 ML591 Chapter 1 Product Specifications 1 6 10 Line Feed Increments Fixed 6 lines per inch Ipi 0 167 inch 4 23 millimeters 8 lines per inch Ipi 0 125 inch 3 175 millimeters Variable n 60 inch n 72 inch n 180 inch n 216 inch n 360 inch Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 19 OKIDATA Service Guide ML590 ML591 Be Chapter 1 Product Specifications 1 6 11 Line Feed Time 65 milliseconds 6 lines per inch lpi 6 milliseconds 8 lines per inch lpi 1 second 5 0 inches C
64. st Cam 107 3 2 16 Left Ground Plate 108 3 2 1 7 Right Ground Plate 109 3 2 18 Rear and Cut Sheet Paper Feed Sensor Levers 110 3 2 19 Platen Assembly 111 3 2 20 Paper Chute Assembly 112 3 2 21 Line Feed Motor Assembly 113 3 2 22 Reset Spring 114 3 2 23 Idle Gear and Change Lever 115 3 2 24 Pressure Spring 116 3 2 20 Carriage Shaft 117 3 2 26 Leaf Spring 118 3 2 2 Bottom Paper Sensor Levers 119 3 2 28 Front Pressure Roller Assembly 120 3 2 29 Tractor Assembly 121 0 2 30 Main Frame 122 3 3 Printer Adjustments 123 3 3 02 Printhead Gap Adjustment 124 3 3 03 Key Combinations 125 Table of Contents Page 3 3 04 Menu Operation 126 PEO Printing the Menu 127 PPEP Reset Menu to Factory Defaults 128 AEN Limited Operation 129 EPER Procedure 130 EPEE Menu Settings 131 3 9 05 TOp of Form 132 3 3 06 Paper Park 133 3 3 07 Tear Feature 134 3 3 08 Forms Tear Off 135 3 4 Cleaning 136 3 4 02 Cleaning Schedule 137 3 4 03 Cleaning Tools 138 3 4 04 Areas to be Cleaned 139 3 5 Lubrication 140 3 6 Shipping Instructions 141 4 Failure amp Repair Analysis 4 1 Introduction 142 4 1 02 Printer Serial Number Identification 143 4 2 Reporting Problems 144 4 3 Troubleshooting Updates 145 4 4 Troubleshooting Tips Preliminary Checks 146 4 4 02 Problem Categories 147 4 4 03 Start Here Flowchart 148 4 4 04 Tips for Preventing Image Problems 149
65. sumable and cross reference to Appendix B is provided for each part Items included in the Recommended Spare Parts List are indicated by the acronym RSPL N A will appear where a part number is not available 590 indicates that the item is specific to the Microline 590 591 indicates that the item is specific to the Microline 591 Both indicates that the item is common to both printers Part Description ltem Comment Appendix B Number Reference This Service Handbook lists the disassembly procedures for major components of the unit Okidata DOES NOT recommend disassembling a unit which is operating normally If you decide to perform disassembly during this training Okidata recommends that you perform only the disassembly procedures for RSPL items All other procedures are provided to assist you in identifying parts It is not likely that you will perform these procedures while servicing the unit Be sure to read all notes cautions and warnings as they contain important information regarding disassembly assembly Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com OKIDATA Service Guide ML590 ML591 Chapter 3 Maintenance amp Disassembly Page 93 3 2 01 Preliminary Items 1 2 3 4 Press the AC switch 1 and power off the printer Remove the paper if installed 2 Detach the AC
66. the data processing is complete the BUSY N signal is disabled and the ACK N signal is sent to request the next data When the buffer is full and reception is not desired the BUSY signal is sent to request data transmission be stopped Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 54 OKIDATA Service Guide ML590 ML591 a Chapter 2 Principles of Operation 2 1 05 Print Control The print data is transmitted as serial data from the LSI to the control circuit and the driver contained in the printhead After the data is printed the sensor analog circuit controlling each pin returns the pin stroke data to the MPU The MPU will make an automatic head gap adjustment This feedback system sets the optimum drive time for each pin in order to maintain high print quality Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 55 G Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation LSI Printhead Interface The connection between the LSI and the printhead is made with the bi directional serial data bus The LSI transmits the print data as serial data to the logic circuit of the printhead The printhead returns serial data from the printhead sensor analo
67. the permanent magnet attracts the armature and the print wires are retracted into the wire guide Two thermistors are used to monitor the printhead temperature A thermistor in the printhead prevents over heating of the coil during periods of continuous bi directional printing If the printhead temperature exceeds 110 degrees Celsius the printer will switch to unidirectional print If the temperature exceeds 115 degrees Celsius printing will stop Once the printhead cools printing will resume When the temperature of the coil exceeds the pre determined limits the control circuit detects the thermistor signal TSD A thermistor in the printhead driver monitors the temperature of the driver If the temperature of the driver exceeds the pre determined limits 110 degrees Celsius unidirectional printing 115 degrees Celsius printing stops the control circuit detects the thermistor signal TSD The voltage of the TSD signal is monitored at the MPU A D port to control the pass number and print method unidirectional bi directional at each of seven levels Bias a F F ai N Print wire f rated printhead f ie Pa F 4 a Ell J7 f T a a m Pleten W E T 1 When printing Paper Armaiyne atten bly Serer Control PCA Tharrilaier Pring wipe Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata
68. tiime mai DPTR Hove gt Frem the ilestration above you can dane that the command aad thee AHTra respons are ipui sithe ame ome Thig it Bitia Lhe bi bo be Bind GRD wp fied bo that the cere Gen be relied before dedi eg het Coenen Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 63 OKIDATA Service Guide ML590 ML591 a Chapter 2 Principles of Operation 2 1 08 Alarm Circuit Driver Circuit Alarm Processing The printhead driver output the head gap magnet output and the color ribbon magnet drive signal are monitored at R670 and C15 and the POWER OFF P signal is output by the comparator Location 01A IC2901 when driven for more than the specified time This signal becomes the ALM signal The ALM signal is sent to the power supply board and causes the DC voltages to be turned off d0 nnn fe GAP MDY AN 4 T COR MOY HDALM F Low Motor Drive Voltage Alarm 1 53 a gt POWER OFF P 407 is converted mio the POWLEW signal 0 vde to 5 vde by the voltage divider network of R533 and R437 then input to the A D port of the MPU The value of this voltage is used to control the drive time and the print speed pass number of the head 2 20 pox 40V POWLEV Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKI
69. tion Utility and Barcode Utility Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 42 OKIDATA Service Guide ML590 ML591 Chapter 1 Product Specifications 1 10 09 OKISmart Panel Utility Packaged with printer Includes Front Panel Control Utility and Drivers for Windows 3 0 amp 3 1 Note The OkiSmart software includes three programs 1 OkiSmart Control 2 OkiSmart Panel Emulator 3 OkiSmart Setup Refer to the Printer Handbook for more information Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 43 ra C Service Guide ML590 ML591 OKIDATA Chapter 1 Product Specifications 1 11 RELIABILITY 1 11 01 Mean Time Before Failure MTBF Approximately 6 000 hours 25 duty cycle 35 page density 1 11 02 Mean Time To Repair MTTR Approximately 15 minutes to major sub assembly level 1 11 03 Printer Life Approximately 16 000 hours of power on time 25 duty cycle 35 page density 1 11 04 Printhead Life Average 200 million characters in 10 cpi utility mode normal 25 duty 35 page density 1 11 05 Ribbon Life Black Approximately 4 million characters Color Black Approximately 1 5 million characters Cyan Approximately 1 5 million
70. tting Racet faring Color change gear Change gear Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 78 G Service Guide ML590 ML591 OKIDATA Chapter 2 Principles of Operation 2 2 05 Line Feed Mechanism The line feed operation is accomplished by activating the line feed motor which turns the platen The rotation of the platen is used to feed paper from the selected paper path Components of the paper feed mechanism are listed below Line Feed Motor pulse motor with Gears Line Feed Idler Gear aerTos Relea com me Fa Mar a q A nn te Frat gpw redler _ 7 Tor Platen Rear Tractor Feed Unit Pressure Roller Change Lever Paper Path Selection Lever The change lever is used to select one of three different paper paths top rear or bottom Paper Clamp Mechanism Moving the Change Lever between the Bottom Top and Rear positions changes the positions of the Front Release Gear Arm and the Release Cam The movement of the Front Release Gear Arm changes the position of the Front Release Gear Shaft This causes the Front Pressure Roller to open or close The movement of the Release Cam causes the Rear Pressure Roller to open or close Position of Status of Front Tension of Status of Tension of Change Lever Pressure Roller Front Pressure
71. updates to this material http opx okidata com Page 95 OKIDATA Service Guide ML590 ML591 i Chapter 3 Maintenance amp Disassembly 3 2 03 Ribbon Protector CAUTION You MUST use a straight slot screwdriver to release the ribbon protector If you attempt to lift the protector without releasing the tabs the protector will break 1 Perform these procedures 3 2 0168 3 2 0255 2 Open the pull up roller cover 1 3 Use a straight slot screwdriver to release the extensions 2 from the carriage frame set 3 4 Lift the ribbon protector 4 straight up and remove it P N 53562801 Protector Ribbon RSPL Both B 2 06 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 96 OKIDATA Service Guide ML590 ML591 i Chapter 3 Maintenance amp Disassembly 3 2 04 Gear Case Assembly 1 Perform these procedures 3 2 0168 3 2 0255 2 Use a straight slot screwdriver to release the four claws 1 of the gear case assembly 2 3 Lift and remove the gear case assembly NOTE Lubrication When lubricating refer to Section 3 5 of this Service Handbook P N 51228501 Gear Case Assembly RSPL Both B 2 06 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http op
72. ved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 29 OKIDATA Service Guide ML590 ML591 i wr l Chapter 1 Product Specifications 1 6 20 Print Speed Table of Print Speed and Character Matrix 120 12 cpi 360 12 cpi 450 15 cpi Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 30 Service Guide ML590 ML591 Chapter 1 Product Specifications OKIDATA 1 7 PAPER SPECIFICATIONS CAUTION Use Bottom Feed and or optional Pull Tractor for card stock and labels 1 7 01 Types Card Stock Weight 120 Ibs 450 g m2 Maximum Width Microline 590 5 to 8 inches 12 7 to 20 3 centimeters Microline 591 5 to 14 inches 12 7 to 35 6 centimeters Length 3 to 17 inches 7 62 to 43 18 centimeters Thickness 017 inches 0 44 millimeters Paper Feed Path Printhead Gap Information Continuous Form Bottom Refer to the Printhead Gap Information Section 1 64 Weight Single Part 12 24 Ib 45 to 90 g m2 Multi Part Carbonless 9 11 Ib 35 to 40 g m2 Multi Part Interleaf Paper 10 12 Ib 38 to 45 g m2 Carbon 9 Ib 35 g m2 Width Microline 590 3 5 to 10 5 inches 8 8 to 26 6 centimeters Microline 591 3 5 to 16 5 inches 8 8 to 41 9 centimeters Length 3 to 17 inches 7 62 to 43 18 centimeters Thickn
73. x okidata com Page 97 OKIDATA Service Guide ML590 ML591 B Chapter 3 Maintenance amp Disassembly 3 2 05 Pull up Roller Assembly 1 Perform this procedure 3 2 01 2 Open the access cover 1 3 Open the cover of the pull up roller assembly 2 4 Press at A while rotating the assembly towards the back of the printer 5 Remove the assembly NOTE Lubrication When lubricating refer to Section 3 5 of this Service Handbook 4 P N 53341501 Roller Pull Up Assembly Narrow RSPL 590 B 2 04 P N 53341601 Roller Pull Up Assembly Wide RSPL 591 B 2 04 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 98 OKIDATA Service Guide ML590 ML591 F Chapter 3 Maintenance amp Disassembly 3 2 06 Upper Cover Access Cover and Sheet Guide Assemblies 1 Perform this procedure 3 2 01 2 Pull the platen knob 1 straight out and remove it 3 Set the change lever 2 to the bottom feed position toward the rear of the printer 4 Insert a flat blade screwdriver into the grooves 3 of the frame and pry the upper cover 4 away from the frame 5 Raise the front side of the upper cover assembly 6 Tilt the upper cover assembly toward the rear to disengage the claws not shown at the rear of the frame 7 Lift the upper cover assembly and remove tt CAUTION Do not r
74. ximum Microline 591 13 6 inches Maximum Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 31 08 Service Guide ML590 ML591 OKIDATA Chapter 1 Product Specifications 1 8 MEMORY SPECIFICATIONS 1 8 01 EEPROM 1 Kbit serial EEPROM used to store Menu data 1 8 02 ROM Older Configuration 1 Mbit Character Generator ROM located on main control board 05C 1 Mbit Printer Control EPROM located on main control board 05D New Configuration 4 Mbit located on main control board 05D 1 8 03 RAM Receive Buffer Size is selected through the Menu Settings are 64 K 32 K 1 line Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 32 OKIDATA Service Guide ML590 ML591 i wr l Chapter 1 Product Specifications 1 9 CONSUMABLES 1 9 01 Ribbon CAUTION Using a non Okidata ribbon may damage the printhead and void any warranties Material Cartridge Fabric Types Black Ribbon Color Ribbon Magenta Yellow Cyan Black Life On average at 10 characters per inch Utility Mode Black Ribbon 4 million characters Color Ribbon Magenta 1 5 million characters Yellow 0 8 million characters Cyan 1 5 million characters Black 1 5 million characters Copyr

OKI MICROLINE 591 Matrix Printer

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