User manual OKI MICROLINE 521

[. . . ] Microline 520/521 Service Handbook P/N 59257803 Microline 520/521 Service Handbook This document may not be reproduced without the written permission of the Okidata Technical Training Group. Every effort has been made to ensure the accuracy of the information contained in this training course. Okidata is not responsible for errors beyond its control. © 1994 by Okidata All rights reserved. February, 1993 September, 1993 December, 1994 P/N 59257801 P/N 59257802 P/N 59257803 First Edition Second Edition Third Edition 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. [. . . ] For every revolution of the DC servo motor, the carriage frame moves 0. 8 inch (20. 32 mm). As the DC servo motor rotates, a slotted disk (called the encoder disk), rotates with the servo motor and passes through the photosensor. The position of the carriage frame can be determined by counting the pulses generated by the photosensors. In the same way, the rotation of the space motor can be recognized and controlled by measuring the phase relationship and the pulsewidth of the signals generated by the photosensors. Principles of Operation 2 - 24 Microline 520/521 Service Handbook P/N 59257803 2-2-02. tif Microline 520/521 Service Handbook P/N 59257803 2 - 25 Principles of Operation 2. 2. 03 Head Gap Mechanism The head gap is automatically set for the thickness of the medium loaded in the printer. In the case of envelopes, where the medium thickness varies as the printhead moves along the platen, the strike force of the pins changes to compensate for the differences in thickness. Head Gap Setting Operation Once printing starts, the space motor rotates the ribbon gear, causing idle gear C to turn the change gear. When the MPU requests a change in the head gap setting, the GAP-P signal causes the armature (which is holding the change gear) to be attracted to the pranger magnet. The gap reset spring can now push the change gear so it contacts the gap change gear. The rotation of the gap change gear causes idle gear D to turn the adjust gear. The adjust gear turns the adjusting screw, resulting in a new head gap setting. NOTE: As the adjusting screw turns counter-clockwise, the gap narrows. As the adjusting screw turns clockwise, the gap widens. 2-2-03a. tif Principles of Operation 2 - 26 Microline 520/521 Service Handbook P/N 59257803 There is a cam at each setting of the gap change gear. When the change gear is at the top of the cam, the change gear disengages from the gap change gear. At this time, the armature resets, changing the head gap by one setting. The head gap is modified in . 06 mm units for each range setting. 2-2-03b. tif Microline 520/521 Service Handbook P/N 59257803 2 - 27 Principles of Operation This page was intentionally left blank. Principles of Operation 2 - 28 Microline 520/521 Service Handbook P/N 59257803 2. 2. 04 Ribbon Drive Mechanism Ribbon Drive Operation The ribbon drive mechanism feeds the ribbon in synchronization with the spacing operation. The force required to drive the ribbon is obtained from the space motor. Ribbon Drive Gear Assembly Ribbon Gear This gear is located on the space motor assembly Ribbon Cartridge A continuous loop ribbon with uni-directional feed is used. Ink is supplied from an ink tank, which is built into the ribbon cartridge. When the space motor turns, the ribbon gear on the spacing motor shaft rotates. The rotation is transmitted via a combination of gears, from the ribbon drive gear assembly to the drive gear in the ribbon cartridge. Although the space motor moves in both the forward and reverse directions during bi-directional printing, the gears in the ribbon drive assembly maintain uni-directional ribbon feed by switching the rotation direction of the gears. 2-2-04a. tif Microline 520/521 Service Handbook P/N 59257803 2 - 29 Principles of Operation 2. 2. 05 Line Feed Mechanism The line feed operation is accomplished by activating the line feed motor which turns the platen. The rotation of the platen is used to feed paper from the selected paper path. Line Feed Motor (pulse motor), with gears Line Feed Idler Gear Platen Rear Tractor Feed Unit Pressure Roller Change Lever (Paper Path Selection Lever) The change lever is used to select one of three different paper paths; top, rear or bottom. Paper Clamp Mechanism Moving the change lever between the bottom, top and rear positions, changes the positions of the front release gear arm and the release cam. The movement of the front release gear arm changes the position of the front release gear shaft. The movement of the release cam causes the rear pressure roller to open or close. Position of Change Lever Bottom Top Rear Status of Front Pressure Roller OPEN CLOSED CLOSED Tension of Front Pressure Roller N/A 250 g 90 g Status of Rear Pressure Roller OPEN CLOSED OPEN 2-2-05A. tif Tension of Rear Pressure Roller N/A 700 g N/A Principles of Operation 2 - 30 Microline 520/521 Service Handbook P/N 59257803 Cut Sheet/Continuous Sheet Switching Mechanism Top Feed (for cut sheet paper) When cut sheet paper is used during normal operation or by the Cut Sheet Feeder (CSF) option, place the change lever in the Top Feed position. [. . . ] Refer to Okilink II for current part numbers and pricing information. Item 1 2 3 4 5 6 7 7 8 9 10 11 12 13 Okidata P/N Oki-J P/N 53562601 2PP4094-6507P3 53067301 2PP4094-6506P1 55072401 4YA4042-1515G301 56301702 540A2036M1202 55937502 4YA4042-1516G2 53562703 3PP4025-3670G3 56412401 4YB4049-7030P1 56412402 4YB4049-7030P2 55073201 4YB4021-1143P1 56609701 3YS4011-1315P1 50099501 4YA4023-2801G1 50707501 4PP4025-3621P1 56306201 540A2062T2102 56306101 540A2067T1252 Description Knob: Platen (ML500 Series) Cover: (B) for Card Slot PCB: FJIM (w/o ROM) Fuse: 2A 125V (GG52) PCB: LEOP (Operator. Panel) Panel: Operator Transformer: 120 V ML520 Transformer: 120 V ML521 PCB: Filter 120 V Cord: AC 120V Printhead Assembly Clamp: Cord Fuse: 1A 250V (Filter Brd 220V) Fuse: 2. 5A 125V (Filter Board) Comments Refer to B. 1. 02 RSPL Both RSPL Both RSPL Both RSPL Both RSPL Both RSPL Both RSPL 520 RSPL 521 RSPL Both RSPL Both RSPL Both RSPL Both Option RSPL Both RSPL Both Disassembly Procedure 3. 2. 06 3. 2. 06 3. 2. 07 N/A 3. 2. 09 3. 2. 09 3. 2. 08 3. 2. 08 3. 2. 08 3. 2. 01 3. 2. 02 3. 2. 08 3. 2. 08 3. 2. 08 Illustrated Parts Listing B - 14 Microline 520/521 Service Handbook P/N 59257803 1 9 2 7 12 8 11 10 13 3 4 5 6 B-2-02. pcx Microline 520/521 Service Handbook P/N 59257803 B - 15 Illustrated Parts Listing B. 2. 04 Printer Unit Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information. Item 1 1 2 3 4 5 6 7 8 9 10 10 11 12 12 13 14 15 15 16 16 17 18 Okidata P/N Oki-J P/N 53563101 3PA4025-3720G1 53563201 3PA4025-3721G1 50804601 3PP4025-3315P1 50804701 3PP4025-3322P1 50804801 3PP4025-3321P1 50804902 4PP4025-3323P2 56627201 3PB4025-3356P1 56510302 3PB4025-3357P2 51228601 3PB4055-2893P1 51010301 3PA4025-3387G1 50923001 3PP4025-3320P1 50923101 3PP4025-3507P1 53067701 3PP4025-3380P1 53563301 3PP4025-3376P1 53563401 3PP4025-3522P1 50923501 4PB4025-3377P1 51009701 4PP4025-3378P1 51009801 3PP4025-3379P1 51009901 3PP4025-3523P1 53563501 4PP4025-3381P1 53563502 4PP4025-3381P2 53067601 4PA4025-3382G1 50923601 4PB4025-3385P1 Description Frame: Main (Narrow) Frame: Main (Wide) Lever: Bottom Paper End Lever: Bottom Sensor Lever: Rear Sensor Lever: Sensor (Cut Sheet/Continuous) Cord: Connection Line Feed Motor: Line Feed Assembly Gear: Line Feed Idle Plate: Left Ground Spring: Leaf (Narrow) Spring: Leaf (Wide) Cam: Adjust Rack: Space (Narrow) Rack: Space (Wide) Spring: Tension (Space Rack) Guide: Rail Ground Clip Guide: Rail (Narrow) Guide: Rail (Wide) Shaft: Carriage (Narrow) Shaft: Carriage (Wide) Protector: Support (Assembly) Spring: Support Protect Reset Comments Refer to B. 1. 02 RSPL 520 RSPL 521 RSPL Both RSPL Both RSPL Both RSPL Both RSPL Both RSPL Both RSPL Both RSPL Both RSPL 520 RSPL 521 RSPL Both RSPL 520 RSPL 521 RSPL Both RSPL Both RSPL 520 RSPL 521 RSPL 520 RSPL 521 RSPL Both RSPL Both Disassembly Procedure 3. 2. 30 3. 2. 30 3. 2. 27 3. 2. 27 3. 2. 18 3. 2. 18 3. 2. 21 3. 2. 21 3. 2. 21 3. 2. 16 3. 2. 26 3. 2. 26 3. 2. 15 3. 2. 13 3. 2. 13 3. 2. 13 3. 2. 15 3. 2. 15 3. 2. 15 3. 2. 25 3. 2. 25 3. 2. 25 3. 2. 25 Illustrated Parts Listing B - 16 Microline 520/521 Service Handbook P/N 59257803 11 5 4 7 6 2 10 8 9 3 1 17 18 14 12 16 13 15 B-2-03. pcx Microline 520/521 Service Handbook P/N 59257803 B - 17 Illustrated Parts Listing B. 2. 05 Printer Unit Part numbers are subject to change. Refer to Okilink II for current part numbers and pricing information. Item 1 1 2 3 4 5 6 7 8 9 9 10 10 Okidata P/N Oki-J P/N 53563101 3PA4025-3720G1 53563201 3PA4025-3721G1 51228001 4PP4025-3340P1 51228101 3PP4025-3341P1 50805301 3PP4025-3352P1 51228201 4PP4025-3353P1 50805101 2PP4025-3354P1 50923201 3PP4025-3355P1 51010201 3PP4025-3386P1 50098301 3PA4025-3370G1 50098302 N/A 53341501 3PA4025-3440G2 53341601 3PA4025-3530G2 Description Frame: Main (Narrow) Frame: Main (Wide) Gear: Change Gear: Tractor Cam: Release Gear: Idle Lever: Change Spring: Reset Plate: Right Ground Platen Assembly (Narrow) Platen Assembly (Wide) Roller: Pull Up Assembly (N) Roller: Pull Up Assembly (W) Comments Refer to B. 1. 02 RSPL 520 RSPL 521 RSPL Both RSPL Both RSPL Both RSPL Both RSPL Both RSPL Both RSPL Both RSPL 520 RSPL 521 RSPL 520 RSPL 521 Disassembly Procedure 3. 2. 30 3. 2. 30 3. 2. 29 3. 2. 29 3. 2. 24 3. 2. 23 3. 2. 23 3. 2. 22 3. 2. 17 3. 2. 19 3. 2. 19 3. 2. 05 3. 2. 05 Illustrated Parts Listing B - 18 Microline 520/521 Service Handbook P/N 59257803 9 10 8 6 3 4 2 5 7 1 B-2-04. pcx Microline 520/521 Service Handbook P/N 59257803 B - 19 Illustrated Parts Listing B. 2. 06 Printer Unit Part numbers are subject to change. 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