Oki Microline 390 & 391 Turbo free download

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

Page: 1 Service Guide ML390/ML391Turbo Chapter 0 About This Manual ML390 Turbo // ML391 Turbo 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/ML391Turbo 0 About This Manual Front Cover Copyright / About Information 1 Configuration 1.1. Standard Printer Configuration 1.2 Options 2 Theory of Operation ...2.1.01 Summary ...2.1.02 Microprocessor and the Peripheral Circuit ...Printer Block Diagram (Figure 2-1) ...Program ROM ...RAM (MSM51C464A-80RS) ...EEPROM ...Large Scale Integrated Chip (LSI) ...2.1.03 Initialization ...2.1.04 Parallel Interface Control ...2.1.05 Print Control ...Print Compensation Control ...2.1.06 Space Motor / Line Feed Motor Control ...2.1.07 Operation Panel ...2.1.08 Alarm Circuit ...2.1.09 Power Supply Circuit 2.2.01 Printhead Mechanism and Operation ...2.2.02 Spacing Operation ...2.2.03 Head Gap Adjusting ...2.2.04 Ribbon Drive ...2.2.05 Paper Feed Operation ...(1) Cut Sheet and Continuous Forms Switching Mechanism ...(2) Cut-sheet feeder operation ...(3) Continuous Forms Operation (Rear) ...(4) Push and pull tractor mechanism (Option) ...(5) Pull tractor mechanism (option) ...(6) Bottom Push Feed Operation (Option) ...(7) Paper Clamp Mechanism ...2.2.06 Paper Detection Mechanism ...2.2.07 Automatic Sheet Feed ...2.2.08 Paper Park Function (Continuous Forms) 3 Assembly/Disassembly ASSEMBLY/DISASSEMBLY ...3.1 Precaution for Parts Replacement ...3.2 Service Tools 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 Table of Contents ...3.3 Disassembly/Reassembly Procedure ...How to Change Parts ...3.3.01 Printhead ...3.3.02 Ribbon Protector ...3.3.03 Pull-up Roller Assy ...3.3.04 Upper Cover Assy, Access Cover Assy and Sheet Guide Assy ...3.3.05 Gear Case Assy ...3.3.06 PC Connector ...3.3.07 Space Motor, Guide Roller Assy ...3.3.08 Space Rack ...3.3.09 Carriage Cable ...3.3.10 Backup Roller Holder Assy ...3.3.11 Platen Assy ...3.3.12 Driver Board (SRXD) ...3.3.13 LF Motor ...3.3.14 Operation Panel PCB (LEOP) ...3.3.15 Control/Power Supply Board (SRXC) ...3.3.16 Transformer Assy ...3.3.17 Change Lever and Gears ...3.3.18 Carriage Shaft ...3.3.19 Paper Pan ...3.3.20 Rear Tractor Assy ...3.3.21 Rear Pressure Assy ...3.3.22 Switch Lever 4 Adjustments 4. ADJUSTMENT ...4-1-1 Gap between the platen and the pr