Oki ML 320 & 321 free download

File name Okidata - ML320, ML321 Service Manual.pdf

Page: 1 Service Guide ML320/ML321 Chapter 0 About This 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 1 Product Specifications 1.1 General Description ...1.1.02 Serial Number Identification & (A-D) Revision Levels ...Compatibility Chart 1.2 Product Specifications 1.3 Paper Specifications 1.4 Physical Specifications 1.5 Power Requirements 1.6 Environmental Requirements 1.7 Agency Approvals 1.8 Options 1.9 Consumables 1.10 Memory Specifications 1.11 Reliability Specifications 2 Principles of Operation 2.1 Printer Overview 2.2 Circuit Board Description ...2.2.01 Operator Panel Board ...2.2.02 Power Supply ...2.2.03 Control Board ...Large Scale Integrated Circuitry (LSI) 2.3 Electrical Operation ...2.3.01 Initialization ...2.3.02 Interface Control ...2.3.03 Print Head Drive Circuit ...2.3.04 Spacing Operation ...2.3.05 Line Feed ...2.3.06 Alarm Circuit 2.4 Mechanical Principle Of Operation & Block Diagrams ...2.4.01 Printhead ...2.4.02 Space Mechanism / Operation ...Head Gap Adjusting Mechanism ...2.4.03 Ribbon Drive Mechanism / Operation ...2.4.04 Paper Feed Mechanism ...2.4.05 Paper-End Detection Mechanism ...2.4.06 Semi-Automatic Sheet Feeder (SASF) Operation 3 Maintenance & Disassembly Maintenance & Disassembly 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 ...3.1.01 General Information, Tools & Precautions 3.2 Disassembly/Assembly Procedures ...3.2.01 Preliminary Items ...3.2.02 Separator Assembly ...3.2.03 Printhead Assembly ...3.2.04 Upper Cover Assembly ...3.2.05 Operator Panel Assembly ...3.2.06 Control Board (Rev A & B) ...Control Board (Rev C) ...Control Board (Rev D) ...3.2.07 IC Card (A) Panel ...3.2.08 Transformer (Rev A & B) ...Transformer (Rev C) ...Transformer (Rev D) ...3.2.09 Filter Assembly ...3.2.10 Power Supply Board (Rev A & B) ...Power Supply Boards (Rev C) 3.2.11 Power Interconnect Module / Cable Guide (Rev A & B) ...Power Interconnect Module / Cable Guide (Rev C) ...Power Interconnect Module / Cable Guide (Rev D) ...3.2.12 Indicator Assembly (Bail Bar Assembly) ...3.2.13 Head Cable Access Cover ...3.2.14 Ribbon Drive Assembly ...3.2.15 Space Motor Assembly ...3.2.16 Carriage Frame Assembly ...3.2.17 Space Rack ...3.2.18 Guide Rail ...3.2.19 Platen Assembly ...3.2.20 Line Feed Motor and