Oki ML520, ML521 Series free download

File name Okidata - ML520, ML521 Series Service Manual.pdf

Page: 1 Service Guide ML520/521 Chapter 0 About This Manual ML520 // ML521 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 ML520/521 0 About This Manual Front Cover Copyright Information 1 Product Specifications 1.1.01 General Information ...1.2 Physical Specifications ...1.3 Power Requirements ...1.4 Environmental Conditions ...1.5 Agency Approvals ...1.6 Operational Specifications ...1.7 Paper Specifications ...1.8 Memory Specifications ...1.9 Consumables ...1.10 Options - Cut Sheet Feeders ...1.10.02 Pull Tractor Kit ...1.10.04 Bottom Push Tractor Kit ...1.10.05 Serial Interface ...1.10.06 Roll Paper Stand ...1.10.08 OKISmart Typer Utility ...1.11 Reliability 2 Principles of Operation 2.1 Electrical Operation ...2.1.01 Main Control Board ...Block Diagram ...Program ROM ...RAM ...LSI ...Electrically Erasable Programmable Read Only Memory (EEPROM) ...2.1.02 Initialization ...2.1.03 Parallel Interface Control ...2.1.04 Print Control ...LSI/Printhead Interface ...Gap Adjust Control ...Print Compensation Control ...2.1.05 Space and Line Feed (SP/LF) Motor Control ...Line Feed Motor Control ...Space Motor Control ...Encoder Disk ...2.1.06 Operation Panel ...2.1.07 Alarm Circuit ...Low Motor Drive Voltage Alarm 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 Table of Contents ...Head Drive Time ...Print Speed ...%Head Overheat Alarm Processing ...2.1.08 Power Supply Circuit 2.2 Mechanical Operation - Printhead Mechanism ...Printhead Gap Information ...Interconnect Diagram: Control Board to Printhead ...Line Feed Motor Resistance ...Space Motor Resistance ...Printhead Operation ...Printhead Temperature ...2.2.02 Spacing Mechanism ...Spacing Operation ...2.2.03 Head Gap Mechanism ...Ribbon Drive Operation ...2.2.05 Line Feed Mechanism ...Cut Sheet/Continuous Sheet Switching Mechanism ...Cut Sheet Paper Feed Operation ...Continuous Paper Feed (Rear Tractor Mechanism) ...Continuous Paper Feed (Pull Tractor Mechanism) ...Continuous Paper Feed (Bottom Tractor Feed Mechanism) ...Continuous Paper Feed (Push/Pull Tractor Mechanism) ...2.2.06 Paper Detection Mechanism ...2.2.07 Support Protector Mechanism ...2.2.08 Automatic Paper Load ...Continuous Feed Paper ...2.2.09 Paper Park 3 Maintenance & Disassembly ...3.1.01 General Information