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OKI MICROLINE 320 Turbo Matrix Printer

1. 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 DATA Service Guide ML320 ML321 OKI l Chapter 1 Product Specifications 1 8 OPTIONS Pull Tractor with Acoustic Cover Cut Sheet Feeder with Access Cover CSF 3000A Super Speed RS232 C Serial Interface Board 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 D AT A Service Guide ML320 ML321 OKI F Chapter 1 Product Specifications 1 9 CONSUMABLES 1 9 01 Cartridge Ribbon Black 3 million character ribbon life Re inking cartridge 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 D AT A Service Guide ML320 ML321 OKI Chapter 1 Product Specifications 1 10 MEMORY SPECIFICATIONS 1 10 01 DRAM 60 Kbytes 1 10 02 Working RAM 15 3 Kbytes 1 10 03 Print Buffer 3 5 Kbytes 1 10 04 Image Buffer 13 2 Kbytes 1 10 05 Receive Buffer Epson Mode 28 Kbytes IBM Mode 16 Kbytes 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 bp
2. Perform these procedures first 3 2 01 23 3 2 04 A Use a straight slot screwdriver to release the claws 1 from the chassis clamps 2 Remove the cable guide 3 Part Item App B Number Description Comment Revision Reference 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 OKIDATA Service Guide ML320 ML321 a Chapter 3 Maintenance amp Disassembly 3 2 12 Indicator Assembly Bail Bar Assembly Perform these procedures first Use needle nose pliers to remove the left bail arm spring 1 Release the claw 2 and detach the left bail arm 3 from the bail bar 4 Pull the left bail arm through the guide hole 5 in the chassis and remove the arm Detach the bail bar from the right bail arm 6 Use needle nose pliers to remove the right bail arm spring 7 Release the claw 8 and detach the right bail arm from the bail bar Pull the right bail arm through the guide hole 9 in the chassis and remove the arm Part Number P N 90911801 P N 93489301 P N 90911701 P N 93489201 P N 50061501 Item Description a ims Commen Revision Reference t P N Indicator Assembly 321 RSPL ABCD B 2 06 08 10 50061502 Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business
3. 2 ROM P N Lock Board Screw Both RSPL ABCD B 2 03 04 05 50605501 LXMC 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 48 i Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly Control Board Rev D CAUTION Check the contacts and connections of the control board If good contact is not made at all connections and ground points false diagnosis will occur Perform these procedures first 3 2 01 A 3 2 04 A 3 2 05 3 Turn the locking post 1 90 degrees clockwise to unlock it Lift the locking claw 2 and pull the control board 3 away from the chassis Detach the cable from the connector 4 Tilt the control board 45 degrees and remove it NOTE When installing verify that correct contacts are made at these points Guides A and B Linefeed Motor Interconnect Module C Sensor Lever D Printhead Cable Connector E The sensor lever must be positioned in the paper end sensor If the lever is not correctly positioned the ALARM lamp will light and the unit will not automatically load paper or receive data Part Item App B Number Description Commen Revision Reference t P N Clamp PCB Both RSPL ABCD B 2 03 04 05 50704301 P N Lock Board Screw Both RSPL ABC B 2 03 04 05 50605501 LXMC P N PCB LXMR 55075
4. HSD 100 dpi 120 dpi 171 4 dpi 200 dpi Utility 120 dpi 144 dpi 205 7 dpi 240 dpi NLQ 240 dpi 288 dpi 411 4 dpi 480 dpi 1 2 07 Character Matrix Sizes NOTE SSD is available ONLY with Rev D units PRINT MODE MATRIX SIZE SSD 7x7 HSD 7X7 Utility 9X7 NLQ 17 X 13 1 2 08 Paper Feed Specification Available Paper Paths Rear Top Bottom Feed NOTE Bottom Feed requires the use of the optional pull tractor Line Feed Increments 1 6 1 8 n 72 n 144 n 288 and n 216 Line Feed Timing 70 ms 6 lines per inch 60 ms 8 lines per inch Slew Rate 4 5 inches per second Continuous Feed Paper 1 2 09 Interface Specifications Centronics Parallel Standard RS232C Serial Optional NOTE Interface cables are sold separately A shielded cable is required Twisted pair wires are recommended for noise protection Parallel interface cables should be no more that 16 4 feet 5 m in length 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 OKID ATA Service Guide ML320 ML321 Ff Chapter 1 Product Specifications 1 3 PAPER SPECIFICATIONS 1 3 01 Width Microline 320 Minimum 3 inches 76 2 mm Maximum 10 inches 254 mm Microline 321 Minimum 3 inches 76 2 mm Maximum 16 inches 406 4 mm 1 3 02 Single Part Forms Weight Minimum 12 pound 45 g m2 Maximum 24 pound 90 g m2 Thic
5. P N Kit Idler Change Both RSPL ABCD B 2 07 09 11 58227501 Gear ML300 Includes the Change Gear and the Idler Gear P N Change Gear Both ABCD B 2 07 09 11 51215901 Included in the Idler Change Gear Kit P N Idler Gear Included Both ABCD B 2 07 09 11 51216001 in the Idler Change Gear Kit 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 71 0 Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly 3 2 23 Release Lever Perform these procedures first 3 2 01 23 3 2 02 23 3 2 04 i 3 2 22 2 Release the claw 1 from the guide 2 in the chassis Pull the release lever 3 in the direction of arrow A and remove the lever Part App B Number Description Commen Revision Reference t P N Lever Release Both RSPL ABCD B 2 07 09 11 53489501 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 OKIDATA Service Guide ML320 ML321 X Chapter 3 Maintenance amp Disassembly 3 2 24 Paper Pressure Guide Perform these procedures first 3 2 01 G 3 2 02 3 Use a straight slot screwdriver to detach the coupling holes 1 of the support spring 2 from the projections 3 on the main
6. Rev D 132 B 2 03 Electrical Components Rev A and B 133 arate B 2 04 Electrical Components Rev C 134 PATER B 2 05 Electrical Components Rev D 135 B 2 06 Printer Mechanism Rev A and B 1of2 136 B 2 07 Printer Mechanism Rev A and B 2 of 2 137 B 2 08 Printer Mechanism Rev C 1 of 2 138 B 2 09 Printer Mechanism Rev C 2 of 2 139 B 2 10 Printer Mechanism Rev D 1 of 2 140 B 2 11 Printer Mechanism Rev D 2 of 2 141 B 2 12 Operator Panel Rev A B C and D 142 B 2 13 Carriage Assembly Rev A B C and D 143 B 2 14 Tractor Assembly Rev A B C and D 144 B 2 15 Options Rev A B C and D 145 B 2 16 Consumables Rev A B C and D 146 B 2 17 Packaging Rev A B C and D 147 _ B 2 18 Documentation Rev A B C and D 148 Page 2 OKID AT A Service Guide ML320 ML321 l F Chapter 0 About This Manual Manual Copyright This document may not be reproduced without 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 1994 by Okidata All rights reserved P N 59231501 First Edition May 1988 Microline 320 321 Training Manual P N 59231501 Second Release May 1990 Microline 320 321 Training Manual P N 59263401 First Edition February 1994 Microline 320 321 Service Handbook P N
7. 0 NTERPAICE Get kbyic ee se al O ADORESS BUS E ENJ te on FOR CONTROL DLATERFACE BPRARG E 55 RINC Bie uP CIAC UE T Block Diagram Rev D i PRINTHEAD ee with built in iatiyakimtung sero __ PRINT DATA DAIVER CIAGU TUG Bi PAPERA EMD SENSOA i FOA CSF cu OPERATION PANEL i PARALLEL INTERFACE DJ FOR CONTROL INTERFACE BOARD 55 AS aac 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 23 1 Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation 2 3 ELECTRICAL OPERATION 2 3 01 Initialization Ga 2 3 02 Interface Control Ga 2 3 03 Print Head Drive Circuit a 2 3 04 Spacing Operation GA 2 3 05 Line Feed a 2 3 06 Alarm Circuit Ga 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 24 we Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation 2 3 01 Initialization In Rev A B and C printers initialization occurs whenever the printer is powered ON or when the signal I PRIME is received at the parallel interface In Rev D printers initialization occurs whenever the printer is powered ON or when the RSTOUT signal is sent from the reset ci
8. 59263401 Second Revision July 1994 Microline 320 321 Service Handbook 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 Company Ltd marca registrada Oki Electric Industry Company Ltd Microline is a registered trademark of Oki Electric Industry Company Ltd Centronics is a registered trademark of Centronics Inc IBM is a registered trademark of International Business Machines Inc Proprinter is a registered trademark of International Business Machines Inc 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 3 OKID AT A Service Guide ML320 ML321 Chapter 0 About This Manual Manual Part Number and Revision 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 4 DATA Service Guide ML320 ML321 OKI Chapter 1 Product Specifications 1 1 GENERAL DESCRIPTION The Microline 320 and Microline 321 are nine
9. 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 26 i Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation 2 3 03 Print Head Drive Circuit This circuit drives the printhead coils 1 through 9 using the HD ON signal along with the nine HD DATA signals The pulsewidth of HD ON determines the pin drive time The pin drive time increases as the number of pins to be driven increases The pins are driven in synchronization with the signal IPT which is derived from the timing encoder PHASE A and PHASE B on the space motor 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 we Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation 2 3 04 Spacing Operation Spacing Motor Control The motor control LSI produces the spacing motor phase signals SP U SP V SP W and the overdrive signal SPD A in accordance with spacing commands from the microprocessor The SPD A signal is a fixed period pulse signal whose pulsewidth is controlled by the program This signal is used to control motor drive time The signal SP ON OFF is used at acceleration deceleration when a large amount torque is required Spacing Motor Encoder Disk Photosensor As the
10. Function of Item C P N 56407503 Transformer Microline 320 56407502 Transformer Microline 321 56413201 Transformer Microline 320 with SSD 56413202 Transformer Microline 321 with SSD Interconnect Module Okidata Purpose Function of Item C P N Interco 55328301 Connects power supply board to nnect main board Module Cable Cable Guide Okidata Purpose Function of Item Sa P N Cable 51003801 Holds cable in place No No Ye Ye Guide S S Covers Okidata Purpose Function of Item C P N Cover 53488302 Middle Cover Microline 320 No S S Cover 53488402 Middle Cover Microline 321 Yes No Cover 53070701 Middle Cover Microline 320 No No No Ye with SSD Cover 53070801 Middle Cover Microline 321 No No No Ye with SSD Chassis Okidata Purpose Function of Item C P N Chassis 50061101 Middle Cover Microline 320 Yes Ye No Chassis 50061201 Middle Cover Microline 321 Yes Ye No Chassis 50104501 Middle Cover Microline 320 No No No Ye with SSD Chassis 50104601 Middle Cover Microline 321 No No No Ye with SSD 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 7 OKID ATA Service Guide ML320 ML321 l F Chapter 1 Product Specifications 1 2 1 2 01 1 2 02 1 2 03 1 2 04 1 2 05 PRODUCT SPECIFICATIONS Print Method I
11. Partner Exchange BPX for any updates to this material http opx okidata com Page 60 we Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly 3 2 13 Head Cable Access Cover NOTE Remove this cover to provide access when connecting the head cable to the control board Perform these procedures first 3 2 01 23 3 2 04 23 3 2 06 23 Slide the carriage frame 1 in the direction of arrow A Release the two claws 2 and remove the head cable access cover 3 Item App B Description Reference P N Cover Head Cable Both RSPL ABC B 2 06 08 50062301 Access 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 61 8 Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly 3 2 14 Ribbon Drive Assembly CAUTION When handling the head cable do NOT bend the cable at sharp angles or you may damage tt Perform these procedures first 3 2 01 A 3 2 04 A Remove the ribbon 1 Insert a straight slot screwdriver through the access slots and release the two front claws 2 and the two rear claws 3 of the ribbon drive assembly 4 Lift and remove the assembly Detach the head cable 5 the cable clamp not shown and the contact pressure rubber 6 from the drive assembly When lubricating r
12. chassis Microline 321 ONLY Work from left to right and use a straight slot screwdriver to detach the coupling holes 4 from the projections 5 on the chassis Remove the paper pressure guide 6 NOTE When installing the paper pressure guide be sure to fit it into the projections 5 and guide plates 7 at the same time The Microline 320 has five coupling holes and ten guide plates The Microline 321 has seven coupling holes and thirteen guide plates Part Item App B Number Description Commen Revision Reference t P N Guide Paper 320 RSPL ABCD B 2 07 09 11 50911501 Pressure P N Guide Paper 321 RSPL ABCD B 2 07 09 11 50911602 Pressure P N Spring Support 321 RSPL ABCD B 2 07 09 11 50913901 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 73 wi FG Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly 3 2 25 Pressure Roller Assembly Perform these procedures first Remove the paper chute 1 Turn the release link 2 as shown in View A so the spine 3 is aligned with the slot 4 in the guide hole Slide the release link off the pressure roller assembly 5 Remove the pressure roller assembly by sliding it through the guide hole 6 NOTES Installation Attach the paper end lever 7 to the shaft of th
13. front of the upper cover assembly 3 and remove the assembly The upper cover assembly contains the access cover assembly 4 the sheet separator assembly 5 the rear cover 6 and the middle cover 7 n i i E y y i Y Do NOT rotate the access cover past the vertical when removing it The tab extensions can break CAUTION The Rev D middle cover is NOT compatible with the Rev A B and C middle cover Before installing the cover move the bail arm lever towards the back of the printer and move the release lever towards the front of the printer After installation verify that the cover is correctly seated in the front slots The cover will warp if it is incorrectly installed Check that the paper bail moves properly When cleaning refer to Section 3 4 4 of this Service Handbook Part Item App B Number Description Comment Revision Reference P N Knob Platen Both RSPL ABCD B 2 03 04 05 51901101 P N Cover Access 320 RSPL ABCD B 2 01 02 50060701 Assembly P N Cover Access 321 RSPL ABCD B 2 01 02 50060801 Assembly P N Separator Sheet 320 RSPL ABCD B 2 01 02 50060901 Assembly P N Separator Sheet RSPL ABCD B 2 01 02 50061001 Assembly P N Frame Rear Cover RSPL ABCD B 2 01 02 53488501 P N Frame Rear Cover RSPL ABCD B 2 01 02 53488601 P N Cover Middle 320 RSPL ABC B 2 01 53488302 P N Cover Middle 321 RSPL ABC B 2 01 53488402 P N Cover Middle SSD 321 RSPL B 2 02 53070801 P N
14. of the following items Ribbon Drive Gear Assembly Ribbon Gear The gear is attached to the spacing motor Ribbon Cartridge Ribbon Cartridge A uni directional feed continuous ribbon is used The ribbon is replenished by a built in ink tank in the ribbon cartridge Grane motor asnmbly Ribbon Feed Operation As the spacing motor rotates the ribbon gear on the spacing motor shaft turns the drive gear in the ribbon cartridge via the ribbon drive gear assembly As a result the ribbon is moved In bi directional printing the ribbon gear rotational direction reverses each time the direction of the carriage movement reverses In this case the gears in the ribbon drive gear assembly move the position of an intermediate idler gear causing the ribbon to feed in one direction 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 35 F A Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation 2 4 04 Paper Feed Mechanism The paper feed mechanism consists of the following items Stepper Motor with drive gear Reduction Gear Platen Push Tractor Unit Pressure Rollers friction feed rollers Pull Tractor Unit optional Paper Feed Operation The line feed motor is mounted on the left side frame of the printer It drives the platen via the reduction gear If the optiona
15. okidata com Page 33 FA Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation Head Gap Adjusting Mechanism The head gap adjusting mechanism adjusts the gap between the platen and printhead by changing the tilt angle of the carriage frame This is accomplished by using the adjusting lever Moving the adjusting lever rotates the adjusting screw The adjusting screw is interlocked with the lever via a gear Rotating the adjusting screw changes the angle of tilt for the carriage frame The printhead is mounted vertically on the carriage frame Changing the angle of tilt for the carriage frame moves the printhead closer to or farther away from the platen The adjusting cam is used to compensate for differences in the printhead gap when measured at the left and right sides of the platen Rotating the adjusting cam changes the height of the guide rail The height of the guide rail helps determine the distance between the printhead and platen when measured at the right end of the platen Turning the adjusting cam to the RIGHT will lower the right side of the guide rail This causes the printhead gap on the right side of the platen to increase Turning the adjusting cam to the LEFT will raise the right side of the guide rail This causes the printhead gap on the right side of the platen to decrease The adjusting lever determines the head gap setting Setting 1 is for one or two part forms Setting 2 is for three or f
16. pin dot matrix printers Two versions of the printers are available The first provides Microline emulation The second version provides Epson and IBM Proprinter emulations which are selected through the Printer Menu The major difference between the Microline 320 and Microline 321 is the width of each printer The Microline 320 can handle 80 print columns at 10 CPI The Microline 321 can print up to 136 columns at 10 CPI The standard interface is a Centronics parallel and an optional RS232 C serial interface can be installed The optional serial interface can transfer data at soeeds up to 19 2K baud Both printers feature an enhanced operator panel which provides access to the following capabilities Menu Selection Quiet Mode Printer Tests Paper Park Print Characteristics Standard Printer Controls 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 5 AW Ae Service Guide ML320 ML321 OKIDATA Chapter 1 Product Specifications 1 1 02 Serial Number Identification amp A D Revision Levels A Rev A units are original production units An interconnect module connects the power supply board to the main control board B Rev B units are retrofitted to include a modified interconnect module which prevents corrosion C Rev C units have a cable harness connection between the power sup
17. 1 Holds cable in place No No Ye Ye Guide S S Covers Okidata Purpose Function of Item C P N Cover 53488302 Middle Cover Microline 320 No S S Cover 53488402 Middle Cover Microline 321 Yes No Cover 53070701 Middle Cover Microline 320 No No No Ye with SSD Cover 53070801 Middle Cover Microline 321 No No No Ye with SSD Chassis Okidata Purpose Function of Item C P N Chassis 50061101 Middle Cover Microline 320 Yes Ye No Chassis 50061201 Middle Cover Microline 321 Yes Ye No Chassis 50104501 Middle Cover Microline 320 No No No Ye with SSD Chassis 50104601 Middle Cover Microline 321 No No No Ye with SSD 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 40 OKIDATA Service Guide ML320 ML321 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 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 applicable product comment RSPL Option Consumable serial number revision level and the cross reference s to Appendix B are provided for each part Items included in the Recommended Spare Par
18. 111 Assembly SSD w o ROMs Control Board 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 Aw itTe AT h Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly 3 2 07 IC Card A Panel NOTE The Rev D printers do not have this part Perform these procedures first 3 2 01 G 3 2 04 a Insert a flat blade screwdriver at the bottom of the chassis 1 and push up on the two claws 2 of the IC card A panel 3 to release the panel Pull the panel in the direction of arrow A and remove the panel Part Item App B Number Description Commen Revision Reference t P N Panel IC Card A Both RSPL ABC B 2 06 08 53494901 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 50 FA Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly 3 2 08 Transformer Revs A and B NOTE The transformer contains a built in temperature fuse Once the fuse opens the transformer MUST be replaced The Rev A B and C transformers are NOT compatible with the Rev D transformer The transformer shown in the diagram is the Rev A and B transformer This unit has been replaced by the Rev C unit shown o
19. 2 Interface Control 25 2 3 03 Print Head Drive Circuit 26 2 38 04 Spacing Operation 27 2 3 05 Line Feed 28 2 3 06 Alarm Circuit 29 2 4 Mechanical Principle Of Operation amp Block Diagrams 30 2 4 01 Printhead 31 2 4 02 Space Mechanism Operation 32 nee Head Gap Adjusting Mechanism 33 2 4 03 Ribbon Drive Mechanism Operation 34 2 4 04 Paper Feed Mechanism 35 2 4 05 Paper End Detection Mechanism 36 2 4 06 Semi Automatic Sheet Feeder SASF Operation 37 3 Maintenance amp Disassembly Maintenance amp Disassembly 38 Table of Contents Page 0 1 01 General Information Tools amp Precautions 39 3 2 Disassembly Assembly Procedures 40 3 2 01 Preliminary Items 41 3 2 02 Separator Assembly 42 3 2 03 Printhead Assembly 43 3 2 04 Upper Cover Assembly 44 3 2 05 Operator Panel Assembly 45 3 2 06 Control Board Rev A amp B 46 eines Control Board Rev C 47 ae Control Board Rev D 48 3 2 07 IC Card A Panel 49 3 2 08 Transformer Rev A amp B 50 PE Transformer Rev C 51 MEERE Transformer Rev D 52 3 2 09 Filter Assembly 53 3 2 10 Power Supply Board Rev A amp B 54 ore Power Supply Boards Rev C 55 3 2 11 Power Interconnect Module Cable Guide Rev A amp B 56 oe Power Interconnect Module Cable Guide Rev C 57 eae Power Interconnect Module Cable Guide Rev D 58 3 2 12 Indicator Assembly Bail Bar Assembly 59 3 2 13 Head Cable Access C
20. 4 55041412 ROM Control Board P N Lock Board Screw Both RSPL ABCD B 2 03 04 05 50605501 LXMC 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 a Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly Control Board Rev C CAUTION Check the contacts and connections of the control board If good contact is not made at all connections and ground points false diagnosis will occur Perform these procedures first 3 2 01 B 3 2 04 A 3 2 05 cc Turn the locking post 1 90 degrees clockwise to unlock it Lift the locking claw 2 and pull the control board 3 away from the chassis Detach the cable from the connector 4 Tilt the control board 45 degrees and remove it NOTE When installing verify that correct contacts are made at these points Guides A and B Linefeed Motor Interconnect Module C Sensor Lever D Printhead Cable Connector E The sensor lever must be positioned in the paper end sensor If the lever is not correctly positioned the ALARM lamp will light and the unit will not automatically load paper or receive data a Item App B a Description Comment Revision Reference P N Clamp PCB Both RSPL ABCD B Control 50704301 Board 2 03 04 05 Sen PCB LXMC 3 w o Both RSPL B 2 03 04 Sen
21. 4 7 Hexadecimal Dump Procedure 98 4 8 Resistance Service Checks Index To Charts 99 4 8 02 Interconnect Diagrams Rev A amp B 100 ee Interconnect Diagrams Rev C 101 PETEN Interconnect Diagrams Rev D 102 4 8 03 Printhead 103 4 8 04 Space Motor 104 4 8 05 Line Feed Motor 105 4 8 06 Operator Panel Board Rev A B amp 106 re Operator Panel Board Rev D 107 4 8 07 Control Board Rev A D 108 4 9 Printer Tests 109 4 9 02 Rolling ASCII Print Test 110 4 9 03 Font Sample Test 111 4 9 04 Serial Interface Loopback Test 112 4 10 Menu Operation 113 4 11 Top Of Form 114 4 12 Paper Park 115 4 13 Forms Tear Off 116 A Reference Charts A 1 Board Diagrams 117 A 2 Index To Charts A B C D 118 A 2 01 Control Board LXMC Rev A and B 119 eens A 2 02 Control Board LXMC 3 Rev C 120 eee A 2 03 Control Board LXMR Rev D 121 A 2 04 Power Supply PAII 2 Rev A and B 122 eee A 2 05 Power Supply SUII 2 Rev C 123 Table of Contents Page A 2 06 Filter Assembly Rev A B C and D 124 A 2 07 Operator Panel LXSP Rev A B and C 125 aoe A 2 08 Operator Panel LXON Rev D 126 A 2 09 RS232 C Serial Interface LXHI Rev A B C andD 127 B Illustrated Parts Listing Illustrated Parts Listing General Information 128 B 1 02 Definitions of Terms 129 B 2 Index to Illustrated Parts Breakdown Charts 130 B 2 01 Covers Rev A B and C 131 even B 2 02 Covers
22. 67 OKID AT A Service Guide ML320 ML321 a Fa Chapter 3 Maintenance amp Disassembly 3 2 20 Line Feed Motor and Gear Line Feed Motor NOTES Use care when performing this procedure The plastic claws will break if too much pressure is applied If the line feed motor gear breaks or becomes worn it is not necessary to replace the entire line feed motor assembly The gear 6 can be replaced without removing the line feed motor assembly However the platen assembly MUST be removed The line feed idle gear should be removed ONLY if it must be replaced The claws will break when the gear is removed A new gear must be installed Perform these procedures first Remove the left bail arm Use a straight slot screwdriver to remove the clip 1 Use a straight slot screwdriver to open the lock levers 2 and push the bracket 3 of the line feed motor 4 in the direction of arrow A Remove the line feed motor from the guides 5 CAUTION Installation If the line feed motor assembly is not correctly installed excessive wear of the platen gears will occur Verify that the tabs are not bent If the tabs are bent straighten them The assembly will not seat if the tabs are bent If the assembly is not seated correctly the gears will not correctly align Rotate the bias gear towards the front of the printer as far as the gear will turn This aligns the bias gear with the platen gear Set the platen assembly in pl
23. B Number Description Commen Revision Reference t P N Module Power Module Both AB B 2 06 53328301 Interconnect Power Inter connect 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 57 Pasi Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly Power Interconnect Module Cable Guide Rev C NOTES The Rev A and B printers do NOT have a cable guide The Rev C and Rev D printers do NOT have a power interconnect module Rev C and Rev D printers have a cable guide Perform these procedures first 3 2 01 23 3 2 04 23 Use a straight slot screwdriver to release the claws 1 from the chassis clamps 2 Remove the cable guide 3 Part Item App B Number Description Commen Revision Reference t P N Guide Cable 320 RSPL CD B 2 08 10 51003801 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 ML320 ML321 2 fy err Chapter 3 Maintenance amp Disassembly Power Interconnect Module Cable Guide Rev D NOTES The Rev A and B printers do NOT have a cable guide The Rev C and Rev D printers do NOT have a power interconnect module Rev C and Rev D printers have a cable guide
24. Cover Middle SSD 320 RSPL B 2 02 53070701 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 45 i Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly 3 2 05 Operator Panel Assembly NOTE The operator panel assembly and board for the Rev D units are NOT compatible with the Rev A B and C operator panel assembly and board Perform these procedures first 3 2 01 a 3 2 04 55 Release the claws 1 and remove the operator panel assembly 2 from the chassis 3 As the operator panel assembly is removed it must be detached from the connector 4 on the control board 5 Release the eight claws 6 and remove the operator board 7 from the bezel 8 App B Comment Revision Reference Description Item Part Number No ai oD o O m lt A n oc A O co Cc O w ab 5 o oe Ci a 2 C9 O O O gt 28 O Q O PCB LXON 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 bpx okidata com Page 46 a Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly 3 2 06 Control Board Rev A and B CAUTION Check the contacts between the
25. KIDATA Chapter 3 Maintenance amp Disassembly 3 2 03 Printhead Assembly WARNING The printhead will be hot immediately after printing Allow the printhead to cool before handling Perform these procedures first 3 2 01 a Open the access cover 1 Remove the ribbon cartridge 2 Move the printhead mounting clamp 3 in the direction of arrow A to unlock the printhead 4 Lift and remove the printhead from the carriage frame 5 NOTE When installing the printhead push the printhead towards the platen Part Item App B Number Description Comment Revision Reference P N Printhead Both RSPL ABCD B 2 03 04 05 50063802 Assembly P N Ribbon Both Consumable ABCD B 2 16 52102001 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 OKID AT A Service Guide ML320 ML321 a Fa Chapter 3 Maintenance amp Disassembly 3 2 04 Upper Cover Assembly Perform these procedures first 3 2 01 35 Wrap a rubber band around the wire extensions of the interface connector This pulls the extensions in and avoids damage when the cover is removed Notshown Detach the platen knob 1 Insert a flat blade screwdriver through the slots 2 and disengage the claws of the cover The Microline 320 has three slots The Microline 321 has five slots Lift the
26. Page 1 Service Guide ML320 ML321 Chapter 0 About This Manual OKIDATA Service Manual ML320 ML321 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 bpx okidata com Table of Contents Page Service Guide ML320 ML321 0 About This Manual Front Cover Manual Copyright Manual Part Number and Revision 3 1 Product Specifications 1 1 General Description 4 1 1 02 Serial Number Identification amp A D Revision Levels 5 een Compatibility Chart 6 1 2 Product Specifications 7 1 3 Paper Specifications 8 1 4 Physical Specifications 9 1 5 Power Requirements 10 1 6 Environmental Requirements 11 1 7 Agency Approvals 12 1 8 Options 13 1 9 Consumables 14 1 10 Memory Specifications 15 1 11 Reliability Specifications 16 2 Principles of Operation 2 1 Printer Overview 17 2 2 Circuit Board Description 18 2 2 01 Operator Panel Board 19 2 2 02 Power Supply 20 2 2 03 Control Board 21 OROEN Large Scale Integrated Circuitry LSI 22 2 3 Electrical Operation 23 2 3 01 Initialization 24 2 3 0
27. Spring Tension Both RSPL ABCD B 2 06 08 10 50911901 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 65 AWAIT AT A Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly 3 2 18 Guide Rail Perform these procedures first Pull the adjusting cam 1 out and rotate it to the horizontal position Release the adjusting cam from the guide 2 in the chassis and remove the cam Push the claw 3 in the direction of arrow A to disengage the guide rail 4 at position B Pull the guide rail in the direction of arrow C to release it from the guide 5 in the chassis Lift and remove the guide rail NOTE After installing the guide rail check the printhead gap adjustment Refer to Section 3 34 of this Service Handbook Part Item App B Number Description Commen Revision Reference t P N Rail Guide 320 RSPL ABCD B 2 06 08 10 51002101 RSPL ABCD B 2 06 08 10 P N Rail Guide 51002102 P N Cam Adjust Both RSPL ABCD B 2 06 08 10 51216201 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 OKIDATA Service Guide ML320 ML321 X Chapter 3 Maintenance amp Disassembly 3 2 19 Platen Assembly Perform th
28. ace securely engaging the idler gear with the platen gears Lock the line feed motor assembly into position Verify that the tabs are not bent Item App B Description Commen Revision Reference t P N Motor Line Feed Both RSPL ABCD B 2 07 09 11 96507003 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 68 OKIDATA Service Guide ML320 ML321 Pe Chapter 3 Maintenance amp Disassembly Line Feed Motor Gear NOTES If the line feed motor gear breaks or becomes worn it is not necessary to replace the entire line feed motor assembly The gear can be replaced without removing the line feed motor assembly However the platen assembly MUST be removed The line feed idle gear should be removed ONLY if it must be replaced The claws will break when the gear is removed Anew gear must be installed Perform these procedures first Remove the left bail arm Use a small cutting pliers to cut the three claws 1 that secure the line feed motor gear 2 to the support shaft 3 Remove the gear and cut claws Apply one drop of machine oil to the support shaft Slide the new gear onto the support shaft Lock the three claws of the gear into the groove of the shaft Rotate the bias gear towards the front of the printer as far as the gear will turn This aligns the bias gear wit
29. ain Control Board Yes G No 3 Board LXMR 55075111 Main Control Board with SSD ee Power Supply Board Okidata Purpose Function of Item C P N PAII 2 55039902 Power Supply Board Yes Ye No No Board gt SUII 2 55047402 Power Supply Board Yes Ye Ye No Board S S N A N A Power supply function included No No No Ye on the Main Control Board S Operator Panel Assembly Okidata Purpose Function of Item C P N LXSP 2 55038602 Operator Panel Board S S LXON 55075011 Operator Panel Board with SSD S 50069603 Operator Panel Bezel S S 50107426 Operator Panel Bezel with SSD S Transformer all Okidata Purpose Function of Item gt ie P N 120 56407503 Transformer Microline 320 Yes Ye Ye No Volt S S XFRMR 120 56407502 Transformer Microline 321 Volt XFRMR 120 56413201 Transformer Microline 320 with Volt SSD XFRMR 120 56413202 Transformer Microline 321 with Volt SSD XFRMR Interconnect Module Interco 55328301 Connects power supply board to nnect main board Module Cable Okidata Purpose Function of Item P N Cable 56616802 Connects power supply board to No No Ye No main board S Cable Guide Okidata Purpose Function of Item C P N Cable 51003801 Holds cable in place No No Ye Ye Guide S S Covers hana Okidata Purpose Function of Item it P N 53488302 Middle Cover Microline 320 S S 53488402 Middle Cover Microline 321 S S Cover 53070701 Middl
30. de 401 4 year 01 month Revision D Serial Number 0154693 Okidata Purpose Function of Item C P N LXMC 55041411 Main Control Board Yes Ye No No Board S LXMC 55041412 Main Control Board Yes Ye Ye No 3 Board S S LXMR 55075111 Main Control Board with SSD S Power Supply Board Okidata Purpose Function of Item C P N PAII 2 95039902 Power Supply Board Yes Ye No No Board SUII 2 55047402 Power Supply Board Yes Ye Ye No Board S S N A N A Power supply function included No No No Ye on the Main Control Board S Operator Panel Assembly kai Okidata Purpose Function of Item a fe fe fe P N LXSP 2 55038602 Operator Panel Board S S LXON 55075011 Operator Panel Board with SSD No No 50069603 Operator Panel Bezel Yes Ye S 50107426 Operator Panel Bezel with SSD No No Transformer Okidata Purpose Function of Item P N 56407503 Transformer Microline 320 56407502 Transformer Microline 321 o lt 0 lt 56413201 Transformer Microline 320 with SSD 56413202 Transformer Microline 321 with SSD Interconnect Module Okidata Purpose Function of Item P N Z O A wn O Interco 55328301 Connects power supply board to nnect main board Module Cable m Okidata Purpose Function of Item i P N Cable 56616802 Connects power supply board to No main board Cable Guide laa Okidata Purpose Function of Item a le je fe P N Cable 5100380
31. e Cover Microline 320 No No No Ye with SSD S Cover 53070801 Middle Cover Microline 321 No No No Ye with SSD S Chassis Okidata Purpose Function of Item C P N Chassis 50061101 Middle Cover Microline 320 Yes Ye No Chassis 50061201 Middle Cover Microline 321 Yes Ye No Chassis 50104501 Middle Cover Microline 320 No No No Ye with SSD Chassis 50104601 Middle Cover Microline 321 No No No Ye with SSD 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 8 Service Guide ML320 ML321 OKIDATA Chapter 1 Product Specifications Compatibility Chart Okidata Purpose Function of Item C P N LXMC 55041411 Main Control Board Yes Ye No No Board S LXMC 55041412 Main Control Board Yes Ye Ye No 3 Board LXMR 55075111 Main Control Board with SSD Ye Power Supply Board Okidata Purpose Function of Item C P N PAII 2 55039902 Power Supply Board Yes Ye No No Board S SUII 2 55047402 Power Supply Board Yes Ye Ye No Board N A N A Power supply function included No No No Ye on the Main Control Board Operator Panel Assembly Okidata Purpose Function of Item C P N LXSP 2 55038602 Operator Panel Board Ye S LXON 55075011 Operator Panel Board with SSD Ye 50069603 Operator Panel Bezel Ye 50107426 Operator Panel Bezel with SSD Ye Page 6 Transformer Okidata Purpose
32. e sensor lever 8 Refer to View B for the correct position If the paper end lever is incorrectly positioned paper jams no paper end indications will occur Position the tab of the paper chute firmly with the groove of the main frame Engage the cut sheet paper end lever attached to the bottom of the paper chute to the bottom paper end lever under the main frame Then install the paper chute Part Item App B Number Description Commen Revision Reference t P N Chute Paper RSPL ABCD B 2 07 09 11 50061801 Assembly 320 P N Chute Paper 21 RSPL ABCD B 2 07 09 11 50061901 Assembly 21 P N Roller Pressure RSPL ABCD B 2 07 09 11 50061701 Assembly P N Link Release Both RSPL ABCD B 2 07 09 11 53489601 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 3 P N Roller Pressure 3 RSPL ABCD B 2 07 09 11 50061601 Assembly 3
33. e the OKIDATA Business Partner Exchange BPX for any updates to this material http opx okidata com Page 54 Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly 3 2 10 Power Supply Board Revs A and B NOTES The Rev D printers do NOT have a power supply board The control board contains circuitry to provide the power supply function Refer to Appendix A for more information on this board Perform these procedures first 3 2 01 55 3 2 04 55 Push the board clamp claw 1 in the direction of arrow A Lift the B side of the power supply board 2 Detach the C side of the power supply board from the power interconnect module 3 Part Item App B Number Description Commen Revision Reference t P N PCB SUII 2 Both RSPL 55047402 B 2 03 04 P N PCB SUII 6 Both Option 55047406 220 24V B 2 03 04 P N Fuse 250V 1A Both Option B 2 03 04 56302502 P N Cable Power Supply Both RSPL B 2 04 56616802 Nylon Conn 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 N Fuse Glass 2 amp Both Option ABC B 2 03 04 56302101 250V PAII or SUII Board Page 55 iri ae Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly Power Supply Boards Rev C NOTES The Rev D printers do NOT have a power supply board The co
34. ed Paper end is detected when the end of the remaining paper is about 1 inch 25 4 mm from the printhead position 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 06 Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation 2 4 06 Semi Automatic Sheet Feeder SASF Operation When the paper release lever is set for friction feed paper opening the bail arm causes the SASF switch to close The line feed motor feeds two inches of paper SASF motion stops after two inches of paper feed motion and paper end is detected SASF should be used for loading tractor feed paper Okidata recommends using SASF instead of pressing FORM FEED Since the paper bail is opened for SASF there is less chance of jamming Open state SASF switeh Main PCR Bail aren n j iclesed state Closed stata Bail arm lopen state 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 38 we Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly Maintenance amp Disassembly This chapter consists of the following sections Disassembly Assembly Procedures 43 Adjustments a Cleaning a Lubrication a Copyright 1997 O
35. eed motor interconnect module 1 and the chassis Then carefully pry the module from the two guide holes 2 Part Item App B Number Description Commen Revision Reference t P N Module LF Motor Both RSPL ABCD B 2 07 09 11 53328401 Interconnect 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 70 mm AF A Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly 3 2 22 Reset Spring Change Gear and Idler Gear CAUTION Please read through this entire procedure before performing it Do NOT press against the vertical extension of the reset spring at any time during this procedure Firm pressure will release the reset spring NOT brute force Perform these procedures first 3 2 01 B 3 2 02 A 3 2 04 A Use a flat blade screwdriver to press down at position A of the reset spring 1 Slide the spring out in the direction of arrow B Detach the change gear 2 Detach the idler gear 3 NOTE Lubrication When lubricating refer to Section 3 5 of this Service Handbook Parts Replacement The Kit Idler Change Gear ML300 includes the change and idler gears Order this kit when replacing these parts Part Item App B Number Description Commen Revision Reference t P N Spring Reset Both RSPL ABCD B 2 07 09 11 50912001
36. efer to Section 3 5 i of this Service Handbook Part Item App B Number Description Commen Revision Reference t P N Drive Ribbon Both RSPL ABCD B 2 13 50063701 Assembly P N Cable Head 320 RSPL ABCD B 2 13 56616301 Flexible P N Cable Head 321 RSPL ABCD B 2 13 56616302 Flexible P N Rubber Contact Both RSPL ABCD B 2 13 51706501 Pressure 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 OKIDATA Service Guide ML320 ML321 Chapter 3 Maintenance amp Disassembly 3 2 15 Space Motor Assembly Perform these procedures first Note the position of the connector 1 During assembly the connector s orientation is critical for correct printhead operation Detach the connector Remove the three mounting screws 2 Remove the space motor assembly 3 Be careful not to lose the slider 4 NOTES Installation Do not touch the contacts of the assembly Position the slider first The contact side of the head 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 Perform the printhead gap adjustment after installing this assembly Refer to Section 3 3 of this Service Handbook Cleani
37. ese procedures first 3 2 01 A 3 2 02 A 3 2 04 A Push the release lever 1 to the rear of the printer Pull the platen lock levers 2 in the direction of arrow A Rotate the lock levers in the direction of arrow B This releases the platen assembly 3 from the chassis Lift and remove the platen assembly NOTES Installation Before installation turn the bias gear 4 towards the front of the printer as far as it will go Set the platen assembly into place Verify that the bias gear securely engages the line feed motor gear Secure the two lock levers Set the release lever to OPEN front and check that the groove of the paper chute firmly engages with the groove of the main chassis Check the printhead gap adjustment Refer to Section 3 3 4A of this Service Handbook Cleaning When cleaning refer to Section 3 4 4A of this Service Handbook Lubrication When lubricating refer to Section 3 5 of this Service Handbook Do NOT lubricate the line feed motor gear Lubricant will cause the gear to disintegrate Part Item App B Number Description Commen Revision Reference t P N Platen Assembly 320 RSPL ABCD B 2 06 08 10 50061305 P N Platen Assembly 321 RSPL ABCD B 2 06 08 10 50061306 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
38. g functions External Interface Controller Parallel Interface Control This circuit supplies signals used by the Centronics parallel interface Serial Interface Control This circuit supplies signals used by the RS 232 C serial interface I O Ports Control signals are sent in response to commands input from the microprocessor The input port is used to read information on the printer s condition Address Latch lt latches the low order eight bits of the address bus AO to A7 These bits are used as addresses for read write operations with peripheral devices Motor Controller Spacing Motor Control This function accelerates and decelerates the spacing motor in accordance with commands from the microprocessor and controls the spacing motor speed in various printing modes Motor speed and direction are determined by monitoring the signals PHASE A and PHASE B which are provided by the encoder on the spacing motor DOT Timing Generation This function generates the DOT ON signal IPT which synchronizes the print wire firing in accordance with the signals PHASE A and PHASE B This timing information is also sent to the microprocessor Block Diagram Rev A B and C wa Tr 8 FRDATHEAD leith Bubt in femperaiare tenner m a OOOO m S0GRES aus he ee n LE tet FEED Morok ADBRESS h bata gus MOTOR CONTROL L3i MoM ooo DRIVER CLRCUIT a a Ona ame CEF a a PaPES Ered TO HE pi oan PAWEL i PARALLEL
39. ge BPX for any updates to this material http opx okidata com Page 20 Tw te Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation 2 2 02 Power Supply Rev A B and C The power supply consists of a power transformer filter board and a DC power supply board The AC input voltage is stepped down to 8 6 VAC 46 VAC and 10 VAC by the power transformer These AC voltages are converted into 8 vdc 40 vdc and 5 vdc by the power supply board for use throughout the printer Power Transformer If the transformer temperature rises above a pre determined level the built in temperature fuse opens to prevent damage to components in the printer Once this fuse opens the transformer MUST be replaced Filter Board The power switch line fuse and line filter are mounted on the filter board Power Supply Board This board transforms AC voltages into 5 vdc 8 vdc and 40 vdc for use throughout the printer Rev D The power supply consists of the power transformer a filter board and power supply circuitry located on the main controller board The input AC voltage is stepped down to 8 6 VAC 46 VAC and 10 VAC by the power transformer These AC voltages are rectified into 8 vdc 5 vdc and 50 vdc levels by the DC power supply circuitry on the main controller board Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX for any upda
40. h the platen gear Set the platen assembly in place securely engaging the line feed motor gear with the platen gears CAUTION lf the claws do not lock into the groove of the support shaft the gear will walk off the shaft during use Verify that the line feed motor gear and line feed motor assembly are correctly installed Verify that the line feed motor gear and the platen gears are correctly aligned Incorrect installation and alignment will cause line feed motor gear breakage and wearing Do NOT apply lubricant to the teeth of the line feed motor gear Grease causes the plastic to break down resulting in premature wear of the gear teeth Part Item App B Number Description Commen Revision Reference t P N Gear Line Feed Both RSPL ABCD B 2 07 09 11 51219001 Motor P N Field Change Order Both AB 58217901 7677A Kit Contains a strengthened line feed motor gear and installation instructions 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 69 OKIDATA Service Guide ML320 ML321 wr Chapter 3 Maintenance amp Disassembly 3 2 21 Line Feed Motor Interconnect Module NOTE Use care when performing this procedure The plastic extension will break if too much pressure is applied Perform these procedures first Insert a straight slot screwdriver between the line f
41. he lock spring 6 on the transformer and detach the lock spring from transformer clamp A 7 Lift the A side of the transformer and detach it from the transformer clamp B 8 Item App B Description Comment Revision Reference Transformer 120 V SSD 320 RSPL eS B 2 05 Transformer 120 V SSD 321 RSPL B 2 05 Transformer SSD 320 Option B 2 05 230 240V RSPL Transformer SSD 321 Option B 2 05 230 240V RSPL 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 53 airi a Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly 3 2 09 Filter Assembly Perform these procedures first 3 2 01 3 2 04 3 Working from the bottom of the chassis push on and release the claw 1 of the filter assembly 2 Lift the AC connector 3 and the AC power switch 4 from the two guides on the main frame Remove the filter assembly The filter assembly contains a 1 5 amp fuse 5 Part Item App B Number Description Comment Revision Reference P N Filter Assembly Both RSPL ABCD B 2 03 04 05 55503103 AC 120 V P N Filter Assembly Both Option ABCD B 2 03 04 05 55503104 AC 220 240V P N Fuse 1 5 amp 250 V Both Option ABCD B 2 03 04 05 56303402 Filter Board Copyright 1997 Okidata Division of OKI America Inc All rights reserved Se
42. ies P N Cord AC 240V Both Option ABCD B 2 03 04 56616501 P N Cord AC 240V Both Option ABCD B 2 05 56624401 P N Kit Parallel Interface Both Option ABCD N A 70000803 Plug n Play Accessory 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 42 ry Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly 3 2 02 Separator Assembly CAUTION To avoid damaging the ribbon protector slide the printhead towards the center of the printer before removing the separator assembly Perform these procedures first 3 2 01 E Open the access cover 1 Move the paper bail lever 2 toward the front of the printer While pressing the release latches 3 tilt the separator assembly 4 toward the rear of the printer to release it from the platen shaft 5 Remove the separator assembly WON A oe F Oy Part Item Number Description App B Commen Revision Reference t P N Separator Assembly 320 RSPL ABCD B 2 06 08 10 50069801 Narrow P N Separator Assembly RSPL ABCD B 2 06 08 10 50069901 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 43 8 Service Guide ML320 ML321 O
43. ing BR2 or equivalent Machine Oil Maintenance Precautions Do NOT disassemble the unit if it is operating normally Before starting disassembly and assembly always power OFF the unit and detach the power cord 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 correct 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 Refer to Section 3 3 4 when the following occur Print quality is darker on either side of the document The following parts are replaced Space Motor Assembly Refer to Section 3 2 15 45 Carriage Shaft Refer to Section 3 2 16 4A Guide Rail Refer to Section 3 2 18 5 Platen Assembly Refer to Section 3 2 19 4 Serial Number Identification amp A D Revision Levels A Rev A units are original production units An interconnect module connects the power supply board to the main contr
44. 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 39 OKID AT A Service Guide ML320 ML321 PF Chapter 3 Maintenance amp Disassembly 3 1 01 General Information This section lists the parts replacement adjustment cleaning and lubrication procedures Disassembly should not be performed unless absolutely necessary NEVER perform disassembly on a malfunctioning unit until you have followed the failure analysis procedures 4 in Section Four of this Service Handbook Follow the procedures listed in Adjustments and Service Settings Adjustments may be required when either consumables or parts are replaced Failure to perform these procedures could result in unnecessary service calls Cleaning procedures must be performed correctly if high print quality is to be achieved 3 1 02 Maintenance Tools 3 1 03 The following tools are required to service the unit 2 Phillips Screwdriver with magnetic tip Straight slot Screwdriver Needle Nose Pliers 4 Inch Rubber Band used during removal of upper cover Cutters Feeler Gauge capable of measuring 002 016 and 018 inches Large straightened Paper Clip used during printhead gap adjustment Digital Multimeter Shop Vacuum Cloth soft and lint free Cotton Swabs All purpose Cleaner Platen Cleaner Contact Kleen P N 51802301 Grease Dow Corn
45. kness Maximum 0 014 inches 0 356 mm 1 3 03 Multipart Forms Carbon Lined or Pressure Sensitive Weight Minimum 9 pound 35 g m2 Maximum 11 pound 40 g m2 Thickness Maximum 0 014 inches 0 356 mm Number of Copies Original plus four copies 1 3 04 Multipart Interleaf Weight Paper Minimum 10 pound 38 g m2 Maximum 12 pound 45 g m2 Carbon Maximum 9 pound 35 g m2 Thickness Maximum 0 014 inches 0 356 mm Number of Copies Original plus four copies 1 3 05 Cut Sheets Single Part ONLY Friction Feed Weight Minimum 12 pound 45 g m2 Maximum 24 pound 90 g m2 Thickness Maximum 0 014 inches 0 356 mm Cut Sheet Feeder 3000 Weight Minimum 12 pound 45 g m2 Maximum 24 pound 90 g m2 Thickness Maximum 0 014 inches 0 356 mm 1 3 06 Envelopes Individual Weight Maximum 24 pound maximum 90 g m2 Thickness Maximum 0 016 inches 0 41 mm Dimensions 6 5 inches x 3 5 8 inches 8 7 8 inches x 3 7 8 inches 9 5 inches x 4 1 8 inches 1 3 07 Envelopes Continuous NOTES Continuous Feed Envelopes should be used ONLY with bottom feed Weight Maximum 24 pound 90 g m2 Thickness Maximum 0 014 inches 0 36 mm Width Minimum 3 inches 76 2 mm Maximum 10 inches 354 mm 1 3 08 Card Stock NOTES Card Stock should be used ONLY with bottom feed Set the head gap at Position 2 for 100 pound card stock Weight Maximum 100 pound 150 g m2 Thickness Maximum 0 008 inches 0 20 mm Dimensi
46. l tractor unit is installed platen rotation is transmitted through the idle gear to the tractor unit Continous form E Puli tractor i Sheet feadar shaft W Drive gear bdie gear The paper feed mechanism is designed so when the stepper motor rotates 48 steps 360 degrees paper is fed 0 17 inch 4 23 mm Friction Feed When the release lever is set to the friction feed position the release lever disengages the change gear from the tractor gear At the same time the release lever applies pressure to push the pressure rollers against the platen allowing paper to be fed a a al oil a y Eai ma we a al N og sala Pa oa 1 LF motor Flaten Idler gear Tractor Feed When the release lever is set to the tractor feed position the release lever allows the reset spring to push the change gear toward the tractor gear At the same time the release lever pushes the pressure rollers away from the platen which allows paper to be fed by the push tractor Push tractor asrmbly Piaten gaar A idler gear Tractor gear B Continuous form Pull 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 bpx okidata com Page 36 rae Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation 2 4 05 Paper End Detection Mechanism Rear Paper Feed When paper i
47. ly Disconnect the cable 2 from the power supply board Remove the screw 3 and detach the grounding wire 4 Insert a straight slot screwdriver into the chassis from the bottom 5 shows location Push the lock spring 6 on the transformer and detach the lock spring from transformer clamp A 7 Lift the A side of the transformer and detach it from the transformer clamp B 8 Item Description Transformer 120 V Transformer 120 V RSPL App B Comment Revision Reference RSPL B 2 03 04 e Option ABC B 2 03 04 RSPL e 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 Transformer 220 240 V Transformer 220 240 V Option RSPL Page 52 iT AY Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly Transformer Rev D NOTE The transformer contains a built in temperature fuse Once the fuse opens the transformer MUST be replaced The Revs A B and C transformers are NOT compatible with the Rev D transformer Perform these procedures first 3 2 01 8 3 2 04 A Disconnect the cable 1 from the filter assembly Disconnect the cable 2 from the power supply board Remove the screw 3 and detach the grounding wire 4 Insert a straight slot screwdriver into the chassis from the bottom 5 shows location Push t
48. ments Single Phase AC Voltage 120 VAC 5 5 15 or 220 240 VAC 10 15 Frequency 50 60 Hz 2 1 5 02 Power Consumption Revs A B and C Operating 315 VA Idle 80 VA Rev D Operating 70 VA Idle 25 VA 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 D AT A Service Guide ML320 ML321 OKI l Chapter 1 Product Specifications 1 6 ENVIRONMENTAL REQUIREMENTS 1 6 01 Temperature Operating 41 through 104 degrees Fahrenheit 5 to 40 degrees Celsius Non Operating 14 through 109 4 degrees Fahrenheit 10 to 43 degrees Celsius Storage 40 through 158 degrees Fahrenheit 40 to 70 degrees Celsius 1 6 02 Relative Humidity Operating 20 to 90 Non Operating 5 to 95 Storage 5 to 95 1 6 03 Acoustic Specifications Standard Operation 57 dba Quiet Mode 52 dba 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 12 7 DATA Service Guide ML320 ML321 OKI Chapter 1 Product Specifications 1 7 AGENCY APPROVALS 1 7 01 Listings Revs A B C and D UL Standard No 478 CSA Standard C22 2 No 220 FCC Part 15 Subject J Class B Revs A B and C VDE 0806 VDC 0875 Class B BS5850 Rev D VDE 0806 VFG 0243 Class B BS7002
49. mpact Dot Matrix Number of Print Wires 9 Print Wire Diameter 013 inch 34 mm Print Modes Revs A B and C High Speed Draft HSD Utility Near Letter Quality NLQ Rev D Super Speed Draft SSD High Speed Draft HSD Utility Near Letter Quality NLQ Character Pitches 10 CPI 12 CPI 17 1 CPI 20 CPI Proportional not available in High Speed Draft mode Character Sets Standard Microline Version Standard ASCII IBM Line Graphics Down Line Loadable DLL Block Graphics Epson IBM Version Character Set Character Set Il DLL not available through Menu NOTES Characters Per Inch cpi Characters Per Second cps Dots Per Inch dpi Character Sets are selected through the Menu Print Speed NOTE Super Speed Draft SSD is available ONLY with Rev D units Character Pitch Print Mode 10 cpl 12 cpi 17 1cpi 20 cpi SSD N A 360 cps N A N A HSD 300 cps 300 cps 300 cps 300 cps Utility 250 cps 250 cps 250 cps 250 cps NLQ 62 5 cps 62 5 cps 62 5 cps 62 5 cps Print Speed at Different CPI for the ML 320 321 moe em ers ower venon is so fe l jw fo mso fo w o o fo O he w e fe O fo w ids fe w fe omw fo w eo fe Oo e fo fe foe Oo fe fo fe f e O fo fo fo fs LQ 2 Pass 10 62 5 240 6 25 Print a C Oo pe fes fe J fe fe fes fe fe 1 2 06 Print Resolution NOTE Super Speed Draft SSD is available ONLY with Rev D units Character Pitch Print Mode 10 cpi 12 cpi 17 1cpi 20 cpi
50. n the following pages Perform these procedures first 3 2 01 G 3 2 04 A Disconnect the cable 1 from the filter assembly Disconnect the cable 2 from the power supply board Remove the screw 3 and detach the grounding wire 4 Insert a straight slot screwdriver into the chassis from the bottom 5 shows location Push the lock spring 6 on the transformer and detach the lock spring from transformer clamp A 7 Lift the A side of the transformer and detach it from the transformer clamp B 8 Part Item Number Description P N Transformer 120 V 56407503 App B Commen Revision Reference t RSPL B 2 03 04 e P N Transformer 220 240 Option ABC B 2 03 04 56407901 V RSPL P N Transformer 220 240 Option ABC B 2 03 04 56407902 V RSPL 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 N Transformer 120 V 321 RSPL 56407502 Page 51 iT AY Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly Transformer Rev C NOTE The transformer contains a built in temperature fuse Once the fuse opens the transformer MUST be replaced The Revs A B and C transformers are NOT compatible with the Rev D transformer Perform these procedures first 3 2 01 cc 3 2 04 A Disconnect the cable 1 from the filter assemb
51. ng When cleaning refer to Section 3 4 4A of this Service Handbook Lubrication When lubricating refer to Section 3 5 4A of this Service Handbook Part Item App B Number Description Commen Revision Reference t P N Guide Space Motor Both RSPL ABCD B 2 13 51001801 Slider P N Connector Head Both RSPL ABCD B 2 13 56718601 P N Motor Space Both RSPL ABCD B 2 13 96507202 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 Page 63 a Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly 3 2 16 Carriage Frame Assembly Perform these procedures first Detach the head clamp 1 Use a flat blade screwdriver to release the tabs of the ribbon protector 2 Remove the ribbon protector Push the carriage shaft clamp 3 in the direction of arrow A Lift the carriage shaft 4 at position B Remove the carriage shaft from the guide hole by pulling at position C Remove the carriage shaft with the carriage frame 5 Slide the carriage frame off the carriage shaft NOTES Installation After installing the carriage shaft check the printhead gap adjustment Refer to Section 3 3 of this Service Handbook Cleaning When cleaning refer to Section 3 4 of this Service Handbook Lubrication When lubricating refer t
52. ntrol board contains circuitry to provide the power supply function Refer to Appendix A for more information on this board Perform these procedures first 3 2 01 8 3 2 04 A Push the board clamp claw 1 in the direction of arrow A Lift the B side of the power supply board 2 Detach the cable from the connector 3 Part App B Number Description Commen Revision Reference t B 2 03 04 B 2 03 04 B 2 03 04 P N PCB SUII 2 Both RSPL ABC 55047402 P N PCB SUII 6 Both Option ABC 55047406 220 24V P N Fuse Glass 2 amp Both Option ABC 56302101 250V PAII or SUII Board P N Fuse 250V 1A Both Option B 2 03 04 56302502 P N Cable Power Supply Both RSPL B 2 04 56616802 Nylon Conn 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 Service Guide ML320 ML321 OKIDATA Chapter 3 Maintenance amp Disassembly 3 2 11 Power Interconnect Module Cable Guide Revs AandB NOTES The Rev A and B printers do NOT have a cable guide The Rev C and Rev D printers do NOT have a power interconnect module Rev C and Rev D printers have a cable guide Perform these procedures first 3 2 01 B 3 2 04 Use a straight slot screwdriver to release the claws 1 from the chassis clamps 2 Remove the power interconnect module 3 Part Item App
53. o Section 3 5 4A of this Service Handbook Part Item App B Number Description Commen Revision Reference t P N Shaft Carriage 320 RSPL ABCD B 2 06 08 10 51109401 P N Shaft Carriage 321 RSPL ABCD B 2 06 08 10 51109402 P N Clamp Head Both RSPL ABCD B 2 13 50702901 P N Frame Carriage Both RSPL ABCD B 2 13 53490401 Assembly P N Protector Ribbon Both RSPL ABCD B 2 13 53056201 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 64 OKIDATA Service Guide ML320 ML321 Chapter 3 Maintenance amp Disassembly 3 2 17 Space Rack Perform these procedures first 3 2 01 G 3 2 04 A 3 2 14 G 3 2 15 88 Remove the tension spring 1 Release the claw 2 from the hole 3 in the chassis Pull the space rack 4 in the direction of arrow A Remove the space rack NOTES Installation Fully seat the two guide pins 5 Cleaning When cleaning refer to Section 3 4 of this Service Handbook 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 Part Item Number Description App B Commen Revision Reference t P N Rack Space 320 RSPL ABCD B 2 06 08 10 53489401 P N Rack Space RSPL ABCD B 2 06 08 10 53489402 P N
54. oduces the ALM signal if any drive time exceeds its specified value The ALM signal activates SCR ON which causes the secondary coil Rev A B and C 40 volts Rev D 50 volts of the transformer to short circuit This creates an over current condition which causes the AC line fuse to open Head Overheat Alarm Circuit In order to protect the printhead coils this circuit uses the printhead s built in thermistor to monitor printhead temperature Printhead temperature rises when the unit is printing When printhead temperature reaches 110 degrees Celsius the HEAD OVERHEAT alarm is generated Printing stops when this alarm is detected This allows the printhead temperature to fall When the printhead temperature falls below the alarm detection level printing is resumed Here is a description of the alarm detection When the temperature of the printhead rises the resistance of the thermistor decreases and the potential falls at the negative input of comparator Q6 Q6 is located on the main controller board This inverts the comparator output causing the HEAD TEMP signal to be sent to the motor control LSI Paper End Detection Circuit When the printer runs out of paper the photosensor on the main control board is deactivated This causes the signal PAPER END to become low This signal is fed to a pin of the motor control LSI Printing stops and the ALARM lamp lights Copyright 1997 Okidata Division of OKI America Inc All rights rese
55. ol board B Rev B units are retrofitted to include a modified interconnect module which prevents corrosion C Rev C units have a cable harness connection between the power supply board and the main control board The cable harness replaces the interconnect module D Rev D units have no power supply board The circuitry for the power supply board has been incorporated on the main control board Please Note the following The Rev C main control board LXMC and power supply board SUII are downward compatible with Rev A and B units The Rev A and Rev B main control board LXMC and power supply board PAII cannot be used in Rev C units Rev D units do NOT use Rev A Rev B or Rev C main control boards transformers operator panels upper covers and lower covers Rev D units have a unique main control board LXMR no power supply board a 50 volt transformer and a unique operator panel LXON NOTE Please refer to the parts lists Appendix B for parts differentiation Please be sure of the parts you need before ordering to avoid confusion and incorrect parts orders Printer Serial Number Identification There are four serial number revision levels for the Microline 320 and 321 printers Hardware differences exist between levels To identify the revision level of a printer record the serial number from the back of the printer Refer to the following to decode the serial number Example Printer Serial Number 401D0154693 Date Co
56. ons Maximum 5 inches x 8 inches 1 3 09 Labels NOTES Labels should be used ONLY with bottom feed Do NOT use fabric labels Do NOT print on the edge or perforation of the label Carrier Width Maximum 8 5 inches 216 mm Microline 320 Maximum 15 inches 381 mm Microline 321 Thickness Maximum 0 011 inches 0 28 mm 1 3 10 Transparencies Thickness Maximum 0 004 inches 0 10 mm Dimensions Maximum 8 5 inches wide x 11 inches long 216 mm x 260 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 OKIDATA Page 9 Service Guide ML320 ML321 Chapter 1 Product Specifications 1 4 PHYSICAL SPECIFICATIONS 1 4 01 Printer Dimensions The printer dimensions do not include the platen knob acoustic cover or paper separator Product Height 320 4 6 321 4 6 1 4 02 Weight Microline 320 Revs A B and C Rev D Microline 321 Revs A B and C Rev D Width Depth 15 7 13 6 21 7 13 6 16 pounds 17 2 pounds 7 8 kg 20 pounds 22 2 pounds 10 1 kg 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 r te Service Guide ML320 ML321 OKIDATA Chapter 1 Product Specifications 1 5 POWER REQUIREMENTS 1 5 01 Input Power Require
57. our part forms Setting 3 is for envelopes and extra thick paper When the adjusting lever is set to position 3 the distance between the printhead and platen increases The electrical contact attached to the carriage cover touches a contact pad on the spacing motor circuit board This reduces printing speed Slower speeds ensure adequate printing pressure Refer to Section 3 3 4 for further details on the Printhead Gap Adjustment Richt Left Center Platen Adjusting Cam Adjusting Gear Adjusting Lever oo Adjusting Screw Adjusti in ustin a pa 5 Adjusting Lever Printhead Gear Platen Adjusting Cam Adjusting Lever OEF EEN EERS Adjusting Screw Counter Clockwise Clockwise Decreases Gap Increases Gap Raises Guide Rail _p aLowers Guide Rail Counter Clockwise Decreases 7 hh hs T Adjusting Cam eh LEE ee 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 opx okidata com Page 34 w Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation 2 4 03 Ribbon Drive Mechanism Operation NOTE The ribbon drive gear assembly is secured to the top of the spacing motor assembly by the four claw tabs The ribbon drive mechanism drives the ribbon in sync with the spacing operation The mechanism is driven by the spacing motor The ribbon drive mechanism consists
58. over 60 3 2 14 Ribbon Drive Assembly 61 3 2 15 Space Motor Assembly 62 3 2 16 Carriage Frame Assembly 63 3 2 1 Space Rack 64 3 2 18 Guide Rail 65 3 2 19 Platen Assembly 66 3 2 20 Line Feed Motor and Gear 67 MOTA Line Feed Motor Gear 68 3 2 21 Line Feed Motor Interconnect Module 69 3 2 22 Reset Spring Change Gear and Idler Gear 70 3 2 23 Release Lever 71 3 2 24 Paper Pressure Guide 72 3 2 20 Pressure Roller Assembly 73 3 2 26 Tractor Assembly 74 3 2 2 Sensor Lever 75 0 2 28 Paper End B Lever 76 3 2 29 Main Chassis Assembly 77 3 3 Adjustments 78 3 3 01 Printhead Gap Adjustment 79 3 4 Cleaning 80 3 5 Lubrication 81 4 Failure amp Repair Analysis Table of Contents Page Failure amp Repair Analysis Introduction 82 4 4 Troubleshooting Tips 83 4 4 02 Common Problems 84 4 5 Fault Alarms 85 4 6 Repair Analysis Procedures Using The Raps 86 4 6 02 RAP Index 87 4 6 03 Troubleshooting Cautions 88 P RAP 01A Operator Panel Lamps Do Not Light Rev A B 89 and C KATR RAP 01B Operator Panel Lamps Do Not Light Rev D 90 er RAP 02A Abnormal Spacing Rev A B and C 91 eee RAP 02B Abnormal Spacing Rev D 92 oe RAP 03 Wrong or Missing Characters Dots on Output 93 ee RAP 04 Line Feed Problems 94 eee RAP 05 Malfunction of Operator Panel Switch es 95 ee RAP 06 Parallel Interface Does Not Receive Data 96 eee RAP 07 Serial Interface Does Not Receive Data 97
59. ply board and the main control board The cable harness replaces the interconnect module D Rev D units have no power supply board The circuitry for the power supply board has been incorporated on the main control board Please Note the following The Rev C main control board LXMC and power supply board SUII are downward compatible with Rev A and B units The Rev A and Rev B main control board LXMC and power supply board PAII cannot be used in Rev C units Rev D units do NOT use Rev A Rev B or Rev C main control boards transformers operator panels upper covers and lower covers Rev D units have a unique main control board LXMR no power supply board a 50 volt transformer and a unique operator panel LXON NOTE Please refer to the parts lists Appendix B 4 for parts differentiation Please be sure of the parts you need before ordering to avoid confusion and incorrect parts orders Printer Serial Number Identification There are four serial number revision levels for the Microline 320 and 321 printers Hardware differences exist between levels To identify the revision level of a printer record the serial number from the back of the printer Refer to the following to decode the serial number Example Printer Serial Number 401D0154693 Date Code 401 4 year 01 month Revision D Serial Number 0154693 LXMC 55041411 Main Control Board Board S m Okidata Purpose Function of Item eee P N LXMC 55041412 M
60. power interconnect module the control board and the power supply board Rev A and B units ONLY Clean the contacts if dirty If contacts are bent or broken replace the module Proper inspection and cleaning of the power interconnect module contacts can eliminate a false diagnosis of a failed control board or power supply board Check the contacts and connections of the control board If good contact is not made at all connections and ground points false diagnosis will occur Refer to Appendix A 4 for detailed information regarding the differences between the Rev A B C and D control boards Perform these procedures first 3 2 01 B 3 2 04 A 3 2 05 A Turn the locking post 1 90 degrees clockwise to unlock it Lift the locking claw 2 and pull the control board 3 away from the chassis Tilt the control board 45 degrees and remove it NOTE When installing verify that correct contacts are made at these points Guides A and B Power Interconnect Module C Linefeed Motor Interconnect Module D Sensor Lever E Printhead Cable Connector F The sensor lever must be positioned in the paper end sensor If the lever is not correctly positioned the ALARM lamp will light and the unit will not automatically load paper or receive data Part Item App B Number Description Commen Revision Reference t P N Clamp PCB Both RSPL ABCD B 2 03 04 05 50704301 P N PCB LXMC 3 w o Both RSPL ABC B 2 03 0
61. r any updates to this material http opx okidata com Page 32 FA Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation 2 4 02 Space Mechanism Operation The spacing operation is performed by applying power to the DC spacing motor This drives the carriage frame along the carriage shaft space rack and guide rail The carriage shaft space rack and guide rail are parallel to the platen The spacing motor assembly consists of the following items DC Motor Gear Carriage Frame Carriage Shaft Space Rack Encoder Disk Sensor Encoder Disk Guide Rail Spacing Operation The printhead and spacing motor are mounted on the carriage frame The carriage frame moves along the carriage shaft space rack and guide rail The carriage shaft space rack and guide rail are parallel to the platen As the spacing motor rotates counterclockwise the carriage frame is driven to the right When the spacing motor rotates one turn the carriage frame moves 0 8 inch 20 32 mm Carriage shaft Fr inthe Guide rail Motor rotation turns the encoder disk The timing windows on the disk then pass through the encoder disk sensor The position of the carriage frame is obtained by counting the pulses generated by the encoder disk sensor as the disk turns 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
62. rcuit Q11 Pin 2 to Q1 and Q3 The initialization sequence is as follows In Rev A B and C printers Q7 and Q11 are reset In Rev D printers Q1 and Q3 are reset In Rev A B and C printers the operating modes of Q7 and Q11 are set In Rev D printers the operating modes of Q1 and Q3 are set Memory ROM and RAM is checked RAM is initialized Carriage homing is performed The carriage will move to the left until it contacts the left frame The program then establishes the interface signals ACK BUSY and the SEL lamp lights 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 i Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation 2 3 02 Interface Control Parallel Interface In Rev A B and C printers the data from the host is input through connector CN5 to the interface LSI Q11 In Rev D printers the data from the host is input through connector CN6 to the interface LSI Q3 The interface LSI latches this input data in synchronization with the STB N signal The BUSY signal is active while this data is being processed When processing is complete the BUSY signal is turned OFF and an ACK N is sent to the host to request more data The BUSY signal is also sent to the host whenever the printer is incapable of receiving data Copyright 1997 Okidata
63. rences exist between levels To identify the revision level of a printer record the serial number from the back of the printer Refer to the following to decode the serial number Example Printer Serial Number 401D0154693 Date Code 401 4 year 01 month Revision D Serial Number 0154693 For more information see the compatibility chart 43 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 1 Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation 2 2 CIRCUIT BOARD DESCRIPTION Operator Panel Board cin Power Supply 35 Control Board cin Large Scale Intergrated Circuitry aa 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 f Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation 2 2 01 Operator Panel Board Rev A B C and D The operator panel board contains switches and LED s which allow the end user to control and monitor the printer s operation For specific information on the capabilities and use of the operator panel please refer to Chapter 4 in the Printer Handbook Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchan
64. rved See the OKIDATA Business Partner Exchange BPX for any updates to this material http bpx okidata com Page 30 i Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation 2 4 MECHANICAL PRINCIPLES OF OPERATION Block Diagram Rev A B and C e E e a e e E e e eee PRINT HELD Twi biilh h fpepersture peagor m EPALE moren i ADDRES Bus Im Los MEMBER ADRESS 240 DATA BUS f F REW i DH i k Ag kbym fd kbyia j 4 a F BDORESS BUS B OFC ER CLRCUTT E E E z Pari END SENSIA E epy OPERATION PANEL _ Pana Lal MTERFACE fas FOR CONTHOL INTERFACE Bh att 5 AFAR TMTEAFAce Lo b a ES CEG Block Diagram Rev D PRINTHEAD vel buit tarmpergione panga FOR CONTROL INTERFACE BOARD 45 AS 2ioc 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 31 FA Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation 2 4 01 Printhead The printhead used by the printer is a highly efficient stored energy type Power is not consumed until the pins are activated Printhead life is approximately 200 million characters Fi E The printhead is designed with nine pins vertically aligned Each pin is welded to an armature ring Behind the armature ring i
65. s a spacer ring Paina Each armature has a permanent magnet behind it The magnet attracts the armature keeping the pin inside the printhead Because of the spacer ring behind the armature ring the armature is attracted toward the permanent magnet at an angle A coil is wrapped around each permanent magnet Ci Vth printing Papir AT etude eam bly Peink wire Tht ritiiar 7 When net printing When a dot is printed current passes through the coil creating a magnetic field which counters the magnetic field of the permanent magnet The armature and pin spring forward A dot is printed on the paper When current is removed from the coil the magnetic field of the permanent magnet attracts the armature The pin is retracted into the printhead The printhead contains a built in thermistor rated at 110 degrees Celsius The thermistor monitors the printhead temperature If the temperature exceeds the 110 degrees Celsius the thermistor causes a signal to be generated on the main controller board The printer stops printing A BUSY signal is sent to the host computer Data remains in the print buffer as long as power is supplied to the printer When the printhead temperature drops below the 110 degree Celsius threshold the BUSY signal to the host computer becomes inactive Printing is resumed Copyright 1997 Okidata Division of OKI America Inc All rights reserved See the OKIDATA Business Partner Exchange BPX fo
66. s installed in the printer it prevents the paper end lever Tip A from falling into the groove of the paper chute and platen This activates the paper end sensor When the printer runs out of paper the paper end lever falls into the groove of the paper chute The rear part of the paper end lever deactivates the paper end sensor An out of paper condition is detected Paper end is detected when the end of the remaining paper is about 1 inch 25 4 mm from the printhead position Bottom Paper Feed Paper installed in the printer contacts the paper end lever Tip B The paper prevents the bottom paper end lever from falling into the slot in the bottom paper guide This causes the rear part of the paper end lever to activate the paper end sensor When the printer runs out of paper the tip of the bottom paper end lever falls into the hole in the bottom paper guide The rear part of the paper end lever activates the paper end sensor An out of paper condition is detected Paper end is detected when the end of the remaining paper is about 1 inch 25 4 mm from the printhead position Cut Sheet Paper Feed Paper installed in the printer prevents the paper end lever Tip C from falling into the groove of the paper chute The paper end sensor is activated When paper is removed the paper end lever falls into the groove of the paper chute The rear part of the paper end lever deactivates the paper end sensor An out of paper condition is detect
67. s the printer functions from a mechanical perspective Serial Number Identification amp A D Revision Levels A Rev A units are original production units An interconnect module connects the power supply board to the main control board B Rev B units are retrofitted to include a modified interconnect module which prevents corrosion C Rev C units have a cable harness connection between the power supply board and the main control board The cable harness replaces the interconnect module D Rev D units have no power supply board The circuitry for the power supply board has been incorporated on the main control board Please Note the following The Rev C main control board LXMC and power supply board SUII are downward compatible with Rev A and B units The Rev A and Rev B main control board LXMC and power supply board PAII cannot be used in Rev C units Rev D units do NOT use Rev A Rev B or Rev C main control boards transformers operator panels upper covers and lower covers Rev D units have a unique main control board LXMR no power supply board a 50 volt transformer and a unique operator panel LXON NOTE Please refer to the parts lists Appendix B for parts differentiation Please be sure of the parts you need before ordering to avoid confusion and incorrect parts orders Printer Serial Number Identification There are four serial number revision levels for the Microline 320 and 321 printers Hardware diffe
68. spacing motor is driven the signals PHASE A and PHASE B are generated by the photosensor encoder disk which is mounted to the spacing motor The motor control LSI divides the frequency of these signals in accordance with the selected print pitch The LSI generates the IPT N signal which provides dot on timing and carriage position detection 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 1 Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation 2 3 05 Line Feed During a line feed operation the line feed motor is driven by the phase signals LF03 and LF04 in synchronization with the signal LFOVD When it is not being driven the line feed motor is held in place by the LF HOLD signal 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 29 FA Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation 2 3 06 Alarm Circuit Drive Circuit Fault Alarm Circuit This is a protective circuit which causes the AC line fuse to open when a fault occurs in the printhead drive circuit the spacing motor drive circuit or the line feed drive circuit The fault alarm circuit monitors the drive time of each of these circuits and pr
69. tes to this material http bpx okidata com Page 21 w Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation 2 2 03 Control Board Microprocessor The microprocessor is the nucleus of the control circuitry All peripheral circuits operate under the control of the microprocessor For the Rev A B and C printers the microprocessor is Q7 800154 For the Rev D printers the microprocessor is Q1 800154 Program Read Only Memory ROM The printer s control program and resident character fonts are stored in the Program ROM The microprocessor operates under the control of this program For the Rev A B and C printers the Program ROM is Q13 128 kilobytes For the Rev D printers the Program ROM is Q4 64 kilobytes Random Access Memory RAM The RAM stores the following information Data to be printed Receive Buffer All character fonts Q12 has a battery backup Data is retained even after power is removed 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 FA Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation Large Scale Integrated Circuitry LSI For the Rev A B and C printers the LSI is Q11 MSM6990 For the Rev D printers the LSI is Q3 7U042 026 This is an external interface and motor control LSI It performs the followin
70. ts List are indicated by the acronym RSPL N A appears where a part number is not available Part Item Product Comment Revision App B Number Description 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 product Be sure to read all notes cautions and warnings as they contain important information regarding assembly disassembly 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 41 OKID AT A Service Guide ML320 ML321 Er Chapter 3 Maintenance amp Disassembly 3 2 01 Preliminary Items 1 Press the AC switch 1 shows location and power OFF the printer 2 Remove the paper if installed 3 Detach the AC power cord 2 4 Detach the interface cable 3 if installed Part Item App B Number Description Commen Revision Reference t P N Cord AC 120 V Both RSPL ABCD B 2 03 04 05 56609701 P N Cord AC 220 V Both Option ABCD B 2 03 04 05 56624101 Right Angle for ML RSPL Ser
71. x okidata com Page 16 D AT A Service Guide ML320 ML321 OKI l Chapter 1 Product Specifications 1 11 RELIABILITY SPECIFICATIONS 1 11 01 Mean Time Between Failures MTBF 5000 hrs 25 duty cycle 35 page density 1 11 02 Mean Time To Repair MTTR 15 minutes major sub assembly level 1 11 03 Printer Life 12 000 hrs 25 duty cycle 35 page density 1 11 04 Ribbon Life 3 million characters 1 11 05 Printhead Life 200 million characters in 10 cpi utility print quality 35 page density and 25 duty cycle 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 17 FA Service Guide ML320 ML321 OKIDATA Chapter 2 Principles of Operation 2 1 PRINTER OVERVIEW 2 1 01 General Information This section describes the operation of the printer It is divided into three parts 1 Circuit Board Description 43 The major components of the main controller board are described and functional descriptions of the operator panel board and power supply are provided Some signal names are listed with a N after them This means that the signal is active or ON when it is a logic 0 This is also indicated by a line over the signal name I PRIME 2 Electrical Operation 4 This section views the printer functions from an electrical perspective 3 Mechanical Operation 43 This section view

OKI MICROLINE 320 Turbo Matrix Printer

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