Oki ML390, ML391 Series free download

File name Okidata - ML390, ML391 Series Service Manual.pdf

Page: 1 Service Guide ML390/391 Chapter 0 About This Manual ML390/ML391 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 ML390/391 0 About This Manual Front Cover Manual Copyright 1 Product Specifications 1.1 General Description - General Information ...1.1.02 Compatibility - Microline 390/391 vs. Microline 390/391-Plus 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 - General Information ...2.1.02 Compatibility - Microline 390/391 vs. Microline 390/391-Plus 2.2 Circuit Board Description ...Block Diagram (Microline 390/391) ...Block Diagram (Microline 390/391-Plus) 2.3 Electrical Operation - 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 Circuits 2.4 Mechanical Principles Of Operation - Printhead ...2.4.02 Space Mechanism / Operation ...Head Gap Adjusting Mechanism ...Head Gap Adjusting Mechanism - Diagram 1 ...Head Gap Adjusting Mechanism - Diagram 2 ...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 ...2.4.07 Release Lever Operation 3 Maintenance & Disassembly 3.1 Maintenance - General Information 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 Table of Contents ...3.1.02 Maintenance Tools ...3.1.03 Maintenance 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 - Revs A and B ...Control Board - Rev C ...3.2.07 IC Card (B) Panel ...3.2.08 Transformer - Revs A and B ...Transformer - Rev C ...3.2.09 Filter Assembly ...3.2.10 Power Supply Board - Revs A and B ...Power Supply Board - Rev C ...3.2.11 Power Interconnect Module / Cable Guide - Revs A and B ...Power Interconnect Module / Cable Guide - Rev C ...3.2.12 Indicator Assembly (Bail Bar Assembly) ...3.2.13 Head Cable Access Cover and Connection Board (SRBS) ...3.2.14 Ribbon Feed Gear Assembly ...3.2.15 Space Motor Assembly ...3.2.16 Carriage Frame Assembly ...3.2.17 Space Rack ...3.2