Text preview for : Okidata - ML390, ML391 Series Service Manual.pdf part of Oki ML390, ML391 Series Okidata - ML390, ML391 Series Service Manual
Back to : Okidata - ML390, ML391 Se | Home
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 ....3.2.18 Guide Rail ....3.2.19 Platen Assembly ....3.2.20 Line Feed Motor and Gear - Line Feed Motor ........Line Feed Motor and Gear - Line Feed Motor Gear ....3.2.21 Line Feed Motor Interconnect Module ....3.2.22 Reset Spring, Change Gear, and Idler Gear ....3.2.23 Release Lever ....3.2.24 Paper Pressure Guide ....3.2.25 Pressure Roller Assembly ....3.2.26 Tractor Assembly ....3.2.27 Sensor Lever ....3.2.28 Paper End (B) Lever ....3.2.29 Main Chassis Assembly 3.3 Adjustments - General Information ....3.3.01 Printhead Gap Adjustment 3.4 Cleaning 3.5 Lubrication 4 Failure & Repair Analysis
Page 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77
Table of Contents 4.1 Overview - Introduction ....4.1.02 Compatibility - Microline 390/391 vs. Microline 390/391-Plus 4.2 Troubleshooting Updates 4.3 Reporting Problems 4.4 Troubleshooting Tips 4.5 Fault Alarms 4.6 Repair Analysis Procedures - Using The RAPS ....4.6.02 RAP Index ....4.6.03 Troubleshooting Cautions ........RAP 01: Operator Panel Lamps Do Not Light ........RAP 02: Abnormal Spacing ........RAP 03: Wrong or Missing Characters / Dots on Output ........RAP 04: Line Feed Problems ........RAP 05: Malfunction of Operator Panel Switch(es) ........RAP 06: Parallel Interface Does Not Receive Data ........RAP 07: Serial Interface Does Not Receive Data 4.7 Hexadecimal Dump 4.8 Resistance / Service Checks - Index To Charts ....4.8.02 Interconnect Diagrams - Microline 390/391 - Rev. A and B ........Interconnect Diagrams - Microline 390/391 - Rev C ........Interconnect Diagrams - Microline 390/391 - Plus ....4.8.03 Printhead ....4.8.04 Space Motor ....4.8.05 Line Feed Motor ....4.8.06 Operator Panel Board ....4.8.07 Control Board 4.9 Printer Tests - General Information ....4.9.02 Rolling ASCII Print Test ....4.9.03 Font Sample Test ....4.9.04 Serial Interface Loopback Test 4.10 Menu Operation 4.11 Top Of Form 4.12 Paper Park 4.13 Forms Tear Off A Board Diagrams A.1 Board Reference Charts - General Information ....A.1.02 Compatibility - Microline 390/391 vs. Microline 390/391-Plus A.2 Index To Charts - Microline 390/391: Rev A And B ....Index To Charts - Microline 390/391: Rev C ....Index To Charts - Microline 390/391 - Plus ....A.2.01 Control Board (SKRB) - Rev A and B
Page 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117
Table of Contents ....A.2.02 Control Board (SKRA) - Rev C and "Plus" Printers ....A.2.03 Power Supply (PAII) - Rev A and B ....A.2.04 Power Supply (SUII) - Rev C and "Plus" Printers ....A.2.05 Filter Assembly ....A.2.06 Operator Panel (LXSP) - Microline 390/391 ....A.2.07 Operator Panel (LXSP-5) - Microline 390/391-Plus ....A.2.08 Interconnect Board (SRBS) ....A.2.09 RS232-C Serial Interface (LXHI) B Illustrated Parts Listing B.1 Illustrated Parts Listing - General Information ....B.1.02 Definitions of Terms ....B.1.03 Compatibility - Microline 390/391 vs. Microline 390/391-Plus ....B.1.04 Parts Ordering Information B.2 Charts - Index ....B.2.01 Covers ....B.2.02 Electrical Components - Rev A and B ....B.2.03 Electrical Components - Rev C ....B.2.04 Printer Mechanism - Rev A and B (1 of 2) ....B.2.05 Printer Mechanism - Rev A and B (2 of 2) ....B.2.06 Printer Mechanism - Rev C (1 of 2) ....B.2.07 Printer Mechanism - Rev C (2 of 2) ....B.2.08 Operator Panel ....B.2.09 Carriage Assembly ....B.2.10 Tractor Assembly ....B.2.11 Options ....B.2.12 Consumables ....B.2.13 Packaging ....B.2.14 Documentation
Page 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144
Page: 2
Service Guide ML390/391
Chapter 0 About This Manual
This document may not be reproduced without 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 our control. © 1994 by Okidata All rights reserved. First Edition April, 1994 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. 7034 Okilink Login Name: Technical Training OKIDATA is a registered trademark of Oki Electric Industry Company, Ltd.; marques deposee de Oki Electric Industry Company, Ltd.; marca registrada, Oki Electric Industry Company, Ltd. Microline is a registered trademark of Oki Electric Industry Company, Ltd. Centronics is a registered trademark of Centronics Inc. IBM is a registered trademark of International Business Machines, Inc. Proprinter is a registered trademark of International Business Machines, Inc. 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)
Page: 3
Service Guide ML390/391
Chapter 1 Product Specifications
1.1 GENERAL DESCRIPTION 1.1.01 General Information The Microline 390, Microline 391, Microline 390-Plus, and 391-Plus are twenty-four pin, dot matrix printers. These printers provide Epson LQ and IBM Proprinter emulations, which are selected through the Printer Menu. The major difference between the Microline 390/390-Plus and Microline 391/391-Plus is the width of each printer. The Microline 390/390-Plus can handle 80 print columns (at 10 CPI). The Microline 391/391-Plus can print up to 136 columns (at 10 CPI). The standard interface is a Centronics parallel and an optional RS232-C serial interface can be installed. The optional serial interface can transfer data at speeds up to 19.2K baud. Both printers feature an enhanced operator panel which provides access to the following capabilities. · Menu Selection · Quiet Mode · Printer Tests · Paper Park · Print Characteristics · Standard Printer Controls
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)
Page: 4
Service Guide ML390/391
Chapter 1 Product Specifications
1.1.02 Compatibility - Microline 390/391 vs. Microline 390/391-Plus The differences between the Microline 390/391 and Microline 390/391-Plus printers are listed below. Hardware Differences · Operator Panel · Operator Board · Character Generator Programmable Read Only Memory (CGROM) · Programmable Read Only Memory (PROM) · Middle Cover Operational Differences · "Plus" printers have more resident fonts. · In the "Plus" printers, data in the receive buffer is printed upon receipt, without having to wait for a line terminator character (CR/LF or FF). · In the "Plus" printers, the DC1/DC3 Acknowledge/Ignore, Receive Buffer Size, and RESET inhibit can be controlled through the printers Menu. Serial Number Revision Levels Microline 390/391 A Rev A units are original production units. An interconnect module connects the power supply board to the main control board. B Rev B units are retrofitted to include a modified interconnect module, which prevents corrosion. C These units have a cable connection between the power supply board and the main control board. The cable connection wire replaces the interconnect module. Microline 390/391-Plus Revision levels do NOT apply to the "Plus" printers.
NOTE: Please refer to the parts lists for parts differentiation. Please be sure of the parts you need before ordering to avoid confusion and incorrect parts orders.
Printer Serial Number Identification There are three serial number revision levels for the printers. Hardware differences exist between levels. To identify the revision level of a printer, record the serial number from the back of the printer. Refer to the following to decode the serial number.
Example Printer Serial Number: 401A0154693 Date Code 401 (4 = year. 01 = month) Revision A Serial Number 0154693 Compatibility Chart Item Okidata P/N Purpos e/ Functio n of Item Printer Serial Number Revision Level 390/391A Main Control Board SKRA Board 5504540 1 Main Control Board Main Control Board Main Control Board Yes Yes No No No 390/391B 390/391C 390+ 391+
SKRB Board
5503870 2
Yes
Yes
Yes
No
No
SKRA-3 Board
5504540 3
Yes
Yes
Yes
Yes
Yes
Power Supply Board PAII Board 5503880 1 Power Supply Board Power Supply Board Yes Yes No No No
SUII Board
5504740 1
Yes
Yes
Yes
Yes
Yes
Operator Panel Assembl y
Panel: Operator Assembly
5006960 1
Operato r Panel Assemb ly (390/39 1) Operato r Panel Assemb ly (390/39 1-Plus) Operato r Panel Board (390/39 1) Operato r Panel Board (390/39 1-Plus)
Yes
Yes
Yes
No
No
Panel: Operator Assembly
5006961 0
No
No
No
Yes
Yes
PCB: LXSP
5504560 1
Yes
Yes
Yes
No
No
PCB: LXSP-5
5503860 5
No
No
No
Yes
Yes
Transfor mer 120 Volt XFRMR 5640720 1 Transfo rmer (390 and 390-Plu s) Transfo rmer (391 and 391-Plu s) Transfo rmer (390 and 390-Plu s) Yes Yes Yes Yes Yes
120 Volt XFRMR
5640720 2
Yes
Yes
Yes
Yes
Yes
220 Volt XFRMR
5640780 1
Yes
Yes
Yes
Yes
No
220 Volt XFRMR
5640780 2
Transfo rmer (391 and 391-Plu s)
Yes
Yes
Yes
No
Yes
Intercon nect Module Interconn ect Module 5532830 1 Connec ts power supply board to main board Yes Yes No No No
Cable Cable 5661680 2 Connec ts power supply board to main board No No Yes Yes Yes
Cable Guide Cable Guide 5100380 1 Holds cable in place No No Yes Yes Yes
Covers Cover 5348830 1 Middle Cover (390) Middle Cover (391) Yes Yes Yes No No
Cover
5348840 1
Yes
Yes
Yes
No
No
Cover
5348831 6
Middle Cover (390-Pl us) Middle Cover (391-Pl us)
No
No
No
Yes
No
Cover
5348842 2
No
No
No
No
Yes
Chassis Chassis 5006110 1 Chassis : Main (390 and 390-Plu s) Yes Yes Yes Yes No
Chassis
5006120 1
Yes Chassis : Main (391 and 391-Plu s)
Yes
Yes
No
Yes
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)
Page: 5
Service Guide ML390/391
Chapter 1 Product Specifications
1.2 PRODUCT SPECIFICATIONS 1.2.01 Print Method · Impact Dot Matrix Number of Print Wires: 24 Print Wire Diameter: .0079 inch (.2 mm) 1.2.02 Print Modes · Utility · Letter Quality (LQ) 1.2.03 Character Pitches · 10 CPI · 12 CPI · 15 CPI · 17.1 CPI · 20 CPI · Proportional 1.2.04 Character Sets · Standard ASCII · Epson Character Set · IBM Character Set I · IBM Character Set II · IBM Proprinter Compatible Character Set · Foreign Language Substitution · Line Graphics
NOTES: Characters Per Inch = cpi Characters Per Second = cps Dots Per Inch = dpi Character Sets are selected through the Menu
1.2.05 Resident Fonts Microline 390/391 · Courier · Utility
NOTE:
Additional fonts can be accessed by using an optional font card.
Microline 390/391-Plus · Courier · Roman · Swiss · Orator · Gothic · Prestige · Utility
NOTE: Additional fonts can be accessed by using an optional font card. The "Plus" printers can access Down Line Loadable (DLL) fonts.
1.2.06 Print Speed
Print Mode
Character Pitch 10 cpi 12 cpi 270 cps 90 cps 15 cpi 168.6 cps 112.5 17.1cpi 192.9 cps 128.6 cps 20 cpi 225 cps 150 cps
Utility LQ
225 cps 75 cps
1.2.07 Print Resolution
Print Mode
Character Pitch 10 cpi 12 cpi 120 dpi 360 dpi 15 cpi 240 dpi 360 dpi 17.1cpi 240 dpi 360 dpi 20 cpi 240 dpi 360 dpi
Utility LQ
120 dpi 360 dpi
1.2.08 Character Matrix Sizes
Print Mode Utility LQ LQ
Matrix Size 9X7 17 X 13 15 X 18
Characters Per Inch All sizes 10 and 12 cpi 15 17.1 and 20 cpi
1.2.09 Characters Per Line
10 CPI 390/390-Plus 391/391-Plus 80 136
12 CPI 96 163
15 CPI 120 204
17.1 CPI 137 233
20 CPI 160 272
1.2.10 Paper Feed Specification Available Paper Paths · Rear · Top · Bottom Feed
NOTE: Bottom Feed requires the use of the optional pull tractor
Line Feed Increments · 1/6", 1/8", n/60", n/180", n/216" and n/360". Line Feed Timing · 70 ms @ 6 lines per inch · Slew Rate: 3.75 inches per second (Continuous Feed Paper) 1.2.11 Interface Specifications · Centronics Parallel (Standard) · RS232C Serial (Optional)
NOTE: Interface cables are sold separately. A shielded cable is required. Twisted-pair wires are recommended for noise protection. Parallel interface cables should be no more that 16.4 feet (5 m) in length.
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)
Page: 6
Service Guide ML390/391
Chapter 1 Product Specifications
1.3 PAPER SPECIFICATIONS 1.3.01 Width · Microline 390/390-Plus Minimum: 3 inches (76.2 mm) Maximum: 10 inches (254 mm) · Microline 391/391-Plus Minimum: 3 inches (76.2 mm) Maximum: 16 inches (406.4 mm) 1.3.02 Single Part Forms · Weight Minimum: 12 pound (45 g/m 2 ) Maximum: 24 pound (90 g/m 2 ) 1.3.03 Multipart Forms - Carbon Lined or Pressure Sensitive · Weight Minimum: 9 pound (35 g/m 2 ) Maximum: 11 pound (40 g/m 2 ) · Thickness Maximum: 0.014 inches (0.356 mm) · Number of Copies Original plus three copies 1.3.04 Multipart - Interleaf · Weight Paper Minimum: 10 pound (38 g/m 2 ) Maximum: 12 pound (45 g/m 2 ) Carbon Maximum: 9 pound (35 g/m 2 ) · Thickness Maximum: 0.014 inches (0.356 mm) · Number of Copies Original plus three copies
1.3.05 Cut Sheets (Single Part ONLY) · Friction Feed Weight Minimum: 12 pound (45 g/m 2 ) Maximum: 24 pound (90 g/m 2 ) · Cut Sheet Feeder 3000 Weight Minimum: 16 pound Maximum: 24 pound (90 g/m 2 ) 1.3.06 Envelopes (Individual) · Weight Maximum: 24 pound maximum (90 g/m 2 ) · Thickness Maximum: 0.016 inches (0.41 mm) · Dimensions 6 1/2 inches x 3 5/8 inches 8 7/8 inches x 3 7/8 inches 9 1/2 inches x 4 1/8 inches 1.3.07 Envelopes (Continuous)
NOTES: Continuous Feed Envelopes should be used ONLY with bottom feed.
· Weight Maximum: 24 pound (90 g/m 2 ) · Thickness Maximum: 0.014 inches (0.36 mm) · Width Minimum: 3 inches (76.2 mm) Maximum: 10 inches (354 mm) 1.3.08 Card Stock
NOTES: Card Stock should be used ONLY with bottom feed. Set the head gap adjusting lever for optimum printing performance.
· Weight Maximum: 100 pound (150 g/m 2 ) · Thickness Maximum: 0.008 inches (0.20 mm)
· Dimensions Maximum: 5 inches x 8 inches 1.3.09 Labels
NOTES: Labels should be used ONLY with bottom feed. Do NOT use fabric labels. Do NOT print on the edge or perforation of the label.
· Carrier Width Maximum: 8.5 inches (216 mm) Microline 390/390-Plus Maximum: 15 inches (381 mm) Microline 391/391-Plus · Thickness Maximum: 0.011 inches (0.28 mm) 1.3.10 Transparencies · Thickness Maximum: 0.004 inches (0.10 mm) · Dimensions Maximum: 8.5 inches wide x 11 inches long (216 mm x 260 mm)
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)
Page: 7
Service Guide ML390/391
Chapter 1 Product Specifications
1.4 PHYSICAL SPECIFICATIONS 1.4.01 Printer Dimensions The printer dimensions do not include the platen knob, acoustic cover, or paper separator.
Product 390/390-Plus 391/391-Plus
Height 4.6" 4.6"
Width 15.7" 21.7"
Depth 13.6" 13.6"
1.4.02 Weight · Microline 390/390-Plus 18.5 pounds · Microline 391/391-Plus 22.3 pounds 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)
Page: 8
Service Guide ML390/391
Chapter 1 Product Specifications
1.5 POWER REQUIREMENTS 1.5.01 Input Power Requirements · Single Phase AC · Voltage 120 VAC +5.5%, -15% or 220/240 VAC +5.5%, -10% · Frequency 50/60 Hz +/- 2% 1.5.02 Power Consumption · Operating: 110 VA · Idle: 40 VA 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)
Page: 9
Service Guide ML390/391
Chapter 1 Product Specifications
1.6 ENVIRONMENTAL REQUIREMENTS 1.6.01 Temperature · Operating 41 through 104 degrees Fahrenheit (5 to 40 degrees Celsius) · Non-Operating 14 through 109.4 degrees Fahrenheit (-10 to 43 degrees Celsius) · Storage -40 through 158 degrees Fahrenheit (-40 to 70 degrees Celsius) 1.6.02 Relative Humidity · Operating 20% to 90% · Non-Operating 5% to 95% · Storage 5% to 95% 1.6.03 Acoustic Specifications · Standard Operation 57 dba · Quiet Mode 52 dba
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)
Page: 10
Service Guide ML390/391
Chapter 1 Product Specifications
1.7 AGENCY APPROVALS 1.7.01 Listings · UL Standard No. 478, Ver. 5 · CSA Standard C22.2 No. 220 · FCC Part 15, Subject J, Class B 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)
Page: 11
Service Guide ML390/391
Chapter 1 Product Specifications
1.8 OPTIONS 1.8.01 Font Card · Prestige Elite · Letter Gothic 1.8.02 Pull Tractor with Acoustic Cover 1.8.03 Cut Sheet Feeder with Access Cover (CSF-3000A) 1.8.04 Super-Speed RS232-C Serial Interface Board 1.8.05 Memory Expansion Card (Microline 390/391-Plus ONLY) · 32 Kbytes Character Buffer 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)
Page: 12
Service Guide ML390/391
Chapter 1 Product Specifications
1.9 CONSUMABLES 1.9.01 Cartridge Ribbon · Black · 2 million character ribbon life · Re-inking cartridge 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)
Page: 13
Service Guide ML390/391
Chapter 1 Product Specifications
1.10 MEMORY SPECIFICATIONS 1.10.01 DRAM · 60 Kbytes 1.10.02 Working RAM · 15.3 Kbytes 1.10.03 Print Buffer · 3.5 Kbytes 1.10.04 Image Buffer · 13.2 Kbytes 1.10.05 Receive Buffer · Epson Mode: 28 Kbytes · IBM Mode: 16 Kbytes 1.10.06 Memory Expansion Card (Option) · 32 Kbytes Character Buffer · Microline 390/391-Plus ONLY
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)
Page: 14
Service Guide ML390/391
Chapter 1 Product Specifications
1.11 RELIABILITY SPECIFICATIONS 1.11.01 Mean Time Between Failures (MTBF) · 5000 hrs @ 25% duty cycle, 35% page density 1.11.02 Mean Time To Repair (MTTR) · 15 minutes @ major sub-assembly level 1.11.03 Printer Life · 12,000 hrs @ 25% duty cycle, 35% page density 1.11.04 Ribbon Life · 2 million characters 1.11.05 Printhead Life · 200 million characters in 10 cpi utility print quality. 35% page density and 25% duty cycle
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)
Page: 15
Service Guide ML390/391
Chapter 2 Principles of Operation
2.1 PRINTER OVERVIEW 2.1.01 General Information This section describes the operation of the printer. It is divided into three parts. · Circuit Board Description The major components of the main controller board are described and functional descriptions of the operator panel board and power supply are provided. Some signal names are listed with a (-N) after them. This means that the signal is "active" or ON when it is a logic "0". This is also indicated by a line over the signal name (I-PRIME). · Electrical Operation This section views the printer functions from an electrical perspective. · Mechanical Operation This section views the printer functions from a mechanical perspective.
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)
Page: 16
Service Guide ML390/391
Chapter 2 Principles of Operation
2.1.02 Compatibility - Microline 390/391 vs. Microline 390/391-Plus The differences between the Microline 390/391 and Microline 390/391-Plus printers are listed below. Hardware Differences · Operator Panel · Operator Board · Character Generator Programmable Read Only Memory (CGROM) · Programmable Read Only Memory (PROM) · Middle Cover Operational Differences · "Plus" printers have more resident fonts. · In the "Plus" printers, data in the receive buffer is printed upon receipt, without having to wait for a line terminator character (CR/LF or FF). · In the "Plus" printers, the DC1/DC3 Acknowledge/Ignore, Receive Buffer Size, and RESET inhibit can be controlled through the printers Menu. Serial Number Revision Levels Microline 390/391 A Rev A units are original production units. An interconnect module connects the power supply board to the main control board. B Rev B units are retrofitted to include a modified interconnect module, which prevents corrosion. C These units have a cable connection between the power supply board and the main control board. The cable connection wire replaces the interconnect module. Microline 390/391-Plus Revision levels do NOT apply to the "Plus" printers.
NOTE: Please refer to the parts lists for parts differentiation. Please be sure of the parts you need before ordering to avoid confusion and incorrect parts orders.
Printer Serial Number Identification There are three serial number revision levels for the printers. Hardware differences exist between levels. To identify the revision level of a printer, record the serial number from the back of the printer. Refer to the following to decode the serial number.
Example Printer Serial Number: 401A0154693 Date Code 401 (4 = year. 01 = month) Revision A Serial Number 0154693 Compatibility Chart
Item
Okidata P/N
Purpose / Function of Item
Printer Serial Number Revision Level 390/391A 390/391B 390/391C 390+ 391+
Main Control Board SKRA Board 55045401 Main Control Board Main Control Board Main Control Board Yes Yes No No No
SKRB Board
55038702
Yes
Yes
Yes
No
No
SKRA-3 Board
55045403
Yes
Yes
Yes
Yes
Yes
Power Supply Board PAII Board 55038801 Power Supply Board Power Supply Board Yes Yes No No No
SUII Board
55047401
Yes
Yes
Yes
Yes
Yes
Operator Panel Assembl y
Panel: Operator Assembly
50069601
Operator Panel Assembly (390/391) Operator Panel Assembly (390/391Plus) Operator Panel Board (390/391) Operator Panel Board (390/391Plus)
Yes
Yes
Yes
No
No
Panel: Operator Assembly
50069610
No
No
No
Yes
Yes
PCB: LXSP
55045601
Yes
Yes
Yes
No
No
PCB: LXSP-5
55038605
No
No
No
Yes
Yes
Transfor mer 120 Volt XFRMR 56407201 Transfor mer (390 and 390-Plus) Transfor mer (391 and 391-Plus) Transfor mer (390 and 390-Plus) Transfor mer (391 and 391-Plus) Yes Yes Yes Yes Yes
120 Volt XFRMR
56407202
Yes
Yes
Yes
Yes
Yes
220 Volt XFRMR
56407801
Yes
Yes
Yes
Yes
No
220 Volt XFRMR
56407802
Yes
Yes
Yes
No
Yes
Intercon nect Module
Interconn ect Module
55328301
Connects power supply board to main board
Yes
Yes
No
No
No
Cable Cable 56616802 Connects power supply board to main board No No Yes Yes Yes
Cable Guide Cable Guide 51003801 Holds cable in place No No Yes Yes Yes
Covers Cover 53488301 Middle Cover (390) Middle Cover (391) Middle Cover (390-Plus ) Middle Cover (391-Plus ) Yes Yes Yes No No
Cover
53488401
Yes
Yes
Yes
No
No
Cover
53488316
No
No
No
Yes
No
Cover
53488422
No
No
No
No
Yes
Chassis Chassis 50061101 Chassis: Main (390 and 390-Plus) Yes Yes Yes Yes No
Chassis
50061201 Chassis: Main (391 and 391-Plus)
Yes
Yes
Yes
No
Yes
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)
Page: 17
Service Guide ML390/391
Chapter 2 Principles of Operation
2.2 CIRCUIT BOARD DESCRIPTION 2.2.01 Operator Panel Board The operator panel board contains switches and LEDs which allow the end user to control and monitor the printers operation. For specific information on the capabilities and use of the operator panel, please refer to Operation in the Setup Guides or Chapter 1: Front Panel Control in the Reference Guides. 2.2.02 Power Supply The power supply consists of a power transformer, filter board and a DC power supply board. The AC input voltage is stepped down to 8.6 VAC, 46 VAC and 10 VAC by the power transformer. These AC voltages are converted into + 5 vdc, + 8 vdc, and + 40 vdc by the power supply board for use throughout the printer. Power Transformer If the transformer temperature rises above a pre-determined level, the built-in temperature fuse opens to prevent damage to components in the printer. Once this fuse opens, the transformer MUST be replaced. Filter Board The power switch, line fuse, and line filter are mounted on the filter board. Power Supply Board This board transforms AC voltages into + 5 vdc, + 8 vdc and + 40 vdc for use throughout the printer. 2.2.03 Control Board Microprocessor The microprocessor is the nucleus of the control circuitry. All peripheral circuits operate under the control of the microprocessor. For the Rev A, B, and C printers, the microprocessor is Q8 - 80C154. Program Read Only Memory (ROM) The printers control program is stored in the Program ROM. The microprocessor operates under the control of this program. For the Rev A, B, and C printers, the Program ROM is Q12 - 128 kilobytes. Random Access Memory (RAM ) The RAM stores the following information. · Data to be printed (Receive Buffer) · All character fonts Q1 and Q2 provide 64 kbytes of RAM. The battery backup retains data when power is removed. Character Generator Read Only Memory (CGROM) This stores the resident character fonts.
Q5 (128 kbytes) is the CGROM. Electrically Erasable and Programmable Read Only Memory (EEPROM) Menu data is stored in Q9 (256 bit), the EEPROM. Large Scale Integrated Circuitry (LSI) Q6 - MSM6990 This is an external interface and motor control LSI. It performs the following functions. External Interface Controller Parallel Interface Control This circuit supplies signals used by the Centronics parallel interface. Serial Interface Control This circuit supplies signals used by the RS 232-C serial interface. I/O Ports Control signals are sent in response to commands input from the microprocessor. The input port is used to read information on the printers condition. Address Latch It latches the low order eight bits of the address bus (A0 to A7). These bits are used as addresses for read/write operations with peripheral devices. Motor Controller Spacing Motor Control This function accelerates and decelerates the spacing motor in accordance with commands from the microprocessor and controls the spacing motor speed in various printing modes. Motor speed and direction are determined by monitoring the signals PHASE A and PHASE B, which are provided by the encoder on the spacing motor. DOT Timing Generation This function generates the DOT-ON signal (IPT), which synchronizes the print wire firing in accordance with the signals PHASE A and PHASE B. This timing information is also sent to the microprocessor. Q6 - MSM79H048, MSM79H097 This LSI controls the functions listed below. Direct Memory Access (DMA) Control Transfers data between the ROM and RAM or between RAMs independent of the microprocessor. Printhead Drive Control Drive pulses are produced for printwire drive timing using the signal IPT as a trigger. IPT is generated from the signals PHASE A and PHASE B (which are produced by the spacing motor). The pulse width (drive time) of IPT varies with the number of printwires to be fired. The duration of IPT is preset by the microprocessor. Print Data Transfer Control Controls the serial transfer of print data. Print data is transferred from the print buffer to a register in this LSI in synchronization with the IPT signal (provided by the MSM6990 LSI). The data stored in this register will be transferred serially to the head drive circuits.
Line Feed Microstep Control Controls incremental stepping of the line feed motor. Memory Interface This expands the memory space for ROMs and RAMs connected to this LSI. Up to 368 kbytes of memory may be accessed. Dynamic RAM (D-RAM) Refresh CAS is used to refresh the D-RAMs before the RAS refresh method is used.
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)
Page: 18
Service Guide ML390/391
Chapter 2 Principles of Operation
Block Diagram (Microline 390/391)
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)
Page: 19
Service Guide ML390/391
Chapter 2 Principles of Operation
Block Diagram (Microline 390/391-Plus)
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)
Page: 20
Service Guide ML390/391
Chapter 2 Principles of Operation
2.3 ELECTRICAL OPERATION 2.3.01 Initialization Initialization occurs whenever the printer is powered ON or when the signal I-PRIME is received at the parallel interface. The initialization sequence is as follows. · Q6, Q8, and Q11 are reset. · The operating modes of Q6, Q8, and Q11 are set. · Memory (ROM and RAM) is checked. · RAM is initialized. · Carriage homing is performed. The carriage will move to the left until it contacts the left frame. · The program establishes the interface signals (ACK, BUSY) and the SEL lamp lights.
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)
Page: 21
Service Guide ML390/391
Chapter 2 Principles of Operation
2.3.02 Interface Control Parallel Interface Data from the host is input through connector CN7 to the interface LSI Q11. The interface LSI latches this input data in synchronization with the STB-N signal. The BUSY signal is active while this data is being processed. When processing is complete, the BUSY signal is turned OFF, and an ACK-N is sent to the host (to request more data). The BUSY signal is also sent to the host whenever the printer is incapable of receiving data.
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)
Page: 22
Service Guide ML390/391
Chapter 2 Principles of Operation
2.3.03 Print Head Drive Circuit This circuit drives the printhead coils (1 through 24) using the HD DV signal, along with the twenty-four HD DATA signals. The pulsewidth of HD DV determines the pin drive time. The pin drive time increases as the number of pins to be driven increases. The pins are driven in synchronization with the signal IPT, which is derived from the timing encoder (PHASE A and PHASE B) on the space motor.
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)
Page: 23
Service Guide ML390/391
Chapter 2 Principles of Operation
2.3.04 Spacing Operation Spacing Motor Control The motor control LSI produces the spacing motor phase signals SP-U, SP-V, SP-W and the overdrive signal SPD-A in accordance with spacing commands from the microprocessor. The SPD-A signal is a fixed period pulse signal whose pulsewidth is controlled by the program. This signal is used to control motor drive time. The signal SP ON/OFF is used at acceleration/deceleration, when a large amount torque is required. The motor driver (MTDV) drives the space motor in accordance with the SPD-A and SP ON/OFF signals. Pins 9 and 11 of the MTDV are the protection circuits against over voltage and over current.
Spacing Motor Encoder Disk / Photosensor As the spacing motor is driven, the signals PHASE-A and PHASE-B are generated by the photosensor / encoder disk (which is mounted to the spacing motor). The motor control LSI divides the frequency of these signals in accordance with the selected print pitch. The LSI generates the IPT-N signal, which provides dot-on timing and carriage position detection.
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)
Page: 24
Service Guide ML390/391
Chapter 2 Principles of Operation
2.3.05 Line Feed During a line feed operation, the line feed motor is driven by the phase signals LFPHA and LFPHB, in synchronization with the signal LFOVD. When it is not being driven, the line feed motor is held in place by the LF HOLD signal.
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)
Page: 25
Service Guide ML390/391
Chapter 2 Principles of Operation
2.3.06 Alarm Circuits Drive Circuit Fault Alarm Circuit This is a protective circuit which causes the AC line fuse to open when a fault occurs in the printhead drive circuit, the spacing motor drive circuit, or the line feed drive circuit. The fault alarm circuit monitors the drive time of each of these circuits and produces the ALM signal if any drive time exceeds its specified value. The ALM signal activates SCR ON, which causes the secondary coil (40 volts) of the transformer to short-circuit. This creates an over-current condition, which causes the AC line fuse to open. Head Overheat Alarm Circuit The printhead contains a built-in thermistor (rated at 130 degrees Celsius). The thermistor monitors the printhead temperature. Printhead temperature rises when the unit is printing. When the temperature of the printhead rises, the resistance of the thermistor decreases and the potential falls at the negative input of comparator Q7. Q7 is located on the main controller board. When printhead temperature reaches approximately 90 degrees Celsius, this comparator output inverts, causing the HEAD TEMP signal to be sent to the motor control LSI. The unit prints unidirectionally. When printhead temperature reaches approximately 130 degrees Celsius, the thermistor sends a signal to the main control board, generating the HEAD OVERHEAT alarm. Printing stops when this alarm is detected (A BUSY signal is sent to the host computer. Data remains in the print buffer as long as power is supplied to the printer). This allows the printhead temperature to fall. When the printhead temperature falls below the alarm detection level, printing is resumed (the BUSY signal to the host computer becomes inactive). Paper End Detection Circuit When the printer runs out of paper, the photosensor on the main control board is deactivated. This causes the signal PAPER END-N to become low. This signal is fed to pin 55 of the motor control LSI (Q11 on the main control board). Printing stops and the ALARM lamp lights.
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)
Page: 26
Service Guide ML390/391
Chapter 2 Principles of Operation
2.4 MECHANICAL PRINCIPLES OF OPERATION 2.4.01 Printhead Operation The printhead used by the printer is a highly efficient, stored-energy type. Power is not consumed until the pins are activated. Printhead life is approximately 200 million characters. The printhead is designed with twenty-four pins, vertically aligned. Each pin is welded to an armature ring. Behind the armature ring is a spacer ring. Each armature has a permanent magnet behind it. The magnet attracts the armature, keeping the pin inside the printhead. Because of the spacer ring behind the armature ring, the armature is attracted toward the permanent magnet at an angle. A coil is wrapped around each permanent magnet. When a dot is printed, current passes through the coil, creating a magnetic field which counters the magnetic field of the permanent magnet. The armature and pin spring forward. A dot is printed on the paper. When current is removed from the coil, the magnetic field of the permanent magnet attracts the armature. The pin is retracted into the printhead.
Overheat Condition The printhead contains a built-in thermistor (rated at 130 degrees Celsius). The thermistor monitors the printhead temperature. Printhead temperature rises when the unit is printing. When the temperature of the printhead rises, the resistance of the thermistor decreases and the potential falls at the negative input of comparator Q7. Q7 is located on the main controller board. When printhead temperature reaches approximately 90 degrees Celsius, this comparator output inverts, causing the HEAD TEMP signal to be sent to the motor control LSI. The unit prints unidirectionally. When printhead temperature reaches approximately 130 degrees Celsius, the thermistor sends a signal to the main control board, generating the HEAD OVERHEAT alarm. Printing stops when this alarm is detected (A BUSY signal is sent to the host computer. Data remains in the print buffer as long as power is supplied to the printer). This allows the printhead temperature to fall. When the printhead temperature falls below the alarm detection level, printing is resumed (the BUSY signal to the host computer becomes inactive). 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)
Page: 27
Service Guide ML390/391
Chapter 2 Principles of Operation
2.4.02 Space Mechanism / Operation The spacing operation is performed by applying power to the DC spacing motor. This drives the carriage frame along the carriage shaft, space rack, and guide rail. The carriage shaft, space rack, and guide rail are parallel to the platen. The spacing motor assembly consists of the following items. · DC Motor / Gear · Carriage Frame · Carriage Shaft · Space Rack · Encoder Disk Sensor · Encoder Disk · Guide Rail Spacing Operation The printhead and spacing motor are mounted on the carriage frame. The carriage frame moves along the carriage shaft, space rack, and guide rail. The carriage shaft, space rack, and guide rail are parallel to the platen. As the spacing motor rotates counterclockwise, the carriage frame is driven to the right. When the spacing motor rotates one turn, the carriage frame moves 0.8 inch (20.32 mm). Motor rotation turns the encoder disk. The timing windows on the disk then pass through the encoder disk sensor. The position of the carriage frame is obtained by counting the pulses generated by the encoder disk sensor as the disk turns.
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)
Page: 28
Service Guide ML390/391
Chapter 2 Principles of Operation
Head Gap Adjusting Mechanism The head gap adjusting mechanism adjusts the gap between the platen and printhead by changing the tilt angle of the carriage frame. This is accomplished by using the adjusting lever. Moving the adjusting lever rotates the adjusting screw. The adjusting screw is interlocked with the lever via a gear. Rotating the adjusting screw changes the angle of tilt for the carriage frame. The printhead is mounted vertically on the carriage frame. Changing the angle of tilt for the carriage frame moves the printhead closer to, or farther away from, the platen. The adjusting cam is used to compensate for differences in the printhead gap when measured at the left and right sides of the platen. Rotating the adjusting cam changes the height of the guide rail. The height of the guide rail helps determine the distance between the printhead and platen, when measured at the right end of the platen. Turning the adjusting cam to the RIGHT will lower the right side of the guide rail. This causes the printhead gap (on the right side of the platen) to increase. Turning the adjusting cam to the LEFT will raise the right side of the guide rail. This causes the printhead gap (on the right side of the platen) to decrease. The adjusting lever determines the head gap setting. Setting 1 is for one or two part forms. Setting 2 is for three or four part forms. Settings 3, 4, and 5 are for envelopes and extra-thick paper. When the adjusting lever is set to position 3, 4, or 5, the distance between the printhead and platen increases. The electrical contact (attached to the carriage cover) touches a contact pad on the spacing motor circuit board. This reduces printing speed. Slower speeds ensure adequate printing pressure. Refer to Section 3.3 for further details on the Printhead Gap Adjustment .
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)
Page: 29
Service Guide ML390/391
Chapter 2 Principles of Operation
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)
Page: 30
Service Guide ML390/391
Chapter 2 Principles of Operation
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)
Page: 31
Service Guide ML390/391
Chapter 2 Principles of Operation
2.4.03 Ribbon Drive Mechanism / Operation
NOTE: The ribbon drive gear assembly is secured to the top of the spacing motor assembly by the four claw tabs.
The ribbon drive mechanism drives the ribbon in sync with the spacing operation. The mechanism is driven by the spacing motor. The ribbon drive mechanism consists of the following items. · Ribbon Drive Gear Assembly · Ribbon Gear The gear is attached to the spacing motor. · Ribbon Cartridge Ribbon Cartridge A uni-directional feed, continuous ribbon is used. The ribbon is replenished by a built-in ink tank in the ribbon cartridge. Ribbon Feed Operation As the spacing motor rotates, the ribbon gear (on the spacing motor shaft) turns the drive gear in the ribbon cartridge via the ribbon drive gear assembly. As a result, the ribbon is moved. In bi-directional printing, the ribbon gear rotational direction reverses each time the direction of the carriage movement reverses. In this case, the gears in the ribbon drive gear assembly move the position of an intermediate idler gear, causing the ribbon to feed in one direction.
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)
Page: 32
Service Guide ML390/391
Chapter 2 Principles of Operation
2.4.04 Paper Feed Mechanism The paper feed mechanism consists of the following items. · Line Feed Motor (with drive gear) · Reduction Gear · Platen · Push Tractor Unit · Pressure Rollers (friction feed rollers) · Pull Tractor Unit (optional)
Paper Feed Operation The line feed motor is mounted on the left side frame of the printer. It drives the platen via the reduction gear. If the optional tractor unit is installed, platen rotation is transmitted through the idle gear to the tractor unit. The paper feed mechanism is designed so when the stepper motor rotates 48 steps (360 degrees), paper is fed 0.17 inch (4.23 mm). Friction Feed
When the release lever is set to the friction feed position, the release lever disengages the change gear from the tractor gear. At the same time, the release lever applies pressure to push the pressure rollers against the platen, allowing paper to be fed.
Tractor Feed When the release lever is set to the tractor feed position, the release lever allows the reset spring to push the change gear toward the tractor gear. At the same time, the release lever pushes the pressure rollers away from the platen, which allows paper to be fed by the push tractor.
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)
Page: 33
Service Guide ML390/391
Chapter 2 Principles of Operation
2.4.05 Paper-End Detection Mechanism Rear Paper Feed When paper is installed in the printer, it prevents the paper-end lever (Tip A) from falling into the groove of the paper chute and platen. This activates the paper-end sensor. When the printer runs out of paper, the paper-end lever falls into the groove of the paper chute. The rear part of the paper-end lever deactivates the paper-end sensor. An out-of-paper condition is detected. Paper-end is detected when the end of the remaining paper is about 1 inch (25.4 mm) from the printhead position. Bottom Paper Feed Paper installed in the printer contacts the paper-end lever (Tip B). The paper prevents the bottom paper-end lever from falling into the slot in the bottom paper guide. This causes the rear part of the paper-end lever to activate the paper-end sensor. When the printer runs out of paper, the tip of the bottom paper-end lever falls into the hole in the bottom paper guide. The rear part of the paper-end lever activates the paper-end sensor. An out-of-paper condition is detected. Paper-end is detected when the end of the remaining paper is about 1 inch (25.4 mm) from the printhead position. Cut-Sheet Paper Feed Paper installed in the printer prevents the paper-end lever (Tip C) from falling into the groove of the paper chute. The paper-end sensor is activated. When paper is removed, the paper-end lever falls into the groove of the paper chute. The rear part of the paper-end lever deactivates the paper-end sensor. An out-of-paper condition is detected. Paper-end is detected when the end of the remaining paper is about 1 inch (25.4 mm) from the printhead position.
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)
Page: 34
Service Guide ML390/391
Chapter 2 Principles of Operation
2.4.06 Semi-Automatic Sheet Feeder (SASF) Operation When the paper release lever is set for friction feed paper, opening the bail arm causes the SASF switch to close. The line feed motor feeds two inches of paper. SASF motion stops after two inches of paper feed motion and paper-end is detected. SASF should be used for loading tractor feed paper. Okidata recommends using SASF instead of pressing FORM FEED. Since the paper bail is opened for SASF, there is less chance of jamming.
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)
Page: 35
Service Guide ML390/391
Chapter 2 Principles of Operation
2.4.07 Release Lever Operation The release lever (on the power switch side of the printer) sets the unit for continuous or cut-sheet feeding. Cut-Sheet The release lever is pushed back (towards the rear of the printer). When the release lever is set for cut-sheet feeding, the change gear moves out (in the direction of arrow A). The pin tractor becomes inoperative, because power is not transmitted from the platen gear (through the idler and change gears) to the tractor gear. Cut-sheets are fed by the rotation of the platen. Continuous The release lever is pushed forward (towards the front of the printer). When the release lever is set for continuous feeding, the reset spring presses the change gear in (in the direction of arrow B). The pin tractor operates, because power is transmitted from the platen gear (through the idler and change gears) to the tractor gear. Continuous feeding is due to the rotation of the pin feeds, not the rotation of the platen.
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)
Page: 36
Service Guide ML390/391
Chapter 3 Maintenance & Disassembly
3.1 MAINTENANCE 3.1.01 General Information This section lists the parts replacement, adjustment, cleaning, and lubrication procedures. Disassembly should not be performed unless absolutely necessary. NEVER perform disassembly on a malfunctioning unit until you have followed the failure analysis procedures in Section Four of this Service Handbook. Follow the procedures listed in Adjustments and Service Settings. Adjustments may be required when either consumables or parts are replaced. Failure to perform these procedures could result in unnecessary service calls. Cleaning procedures must be performed correctly if high print quality is to be achieved. 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)
Page: 37
Service Guide ML390/391
Chapter 3 Maintenance & Disassembly
3.1.02 Maintenance Tools The following tools are required to service the unit. · #2 Phillips Screwdriver (with magnetic tip) · Straight-slot Screwdriver · Needle Nose Pliers (4 Inch) · Rubber Band (used during removal of upper cover) · Cutters · Feeler Gauge · Large, straightened Paper Clip (used during printhead gap adjustment) · Digital Multimeter · Shop Vacuum · Cloth (soft and lint-free) · Cotton Swabs · All-purpose Cleaner · Platen Cleaner · Contact Kleen (P/N 51802301) · Grease (Dow Corning BR2 or equivalent) · Machine Oil 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)
Page: 38
Service Guide ML390/391
Chapter 3 Maintenance & Disassembly
3.1.03 Maintenance Precautions · Do NOT disassemble the unit if it is operating normally. · Before starting disassembly and assembly, always power OFF the unit and detach the power cord. · Detach the interface cable, if installed. · Do not remove parts unnecessarily. Try to keep disassembly to a minimum. · Use the recommended maintenance tools. · When disassembling, follow the listed sequence. Failure to follow the correct sequence may result in damaged parts. · Screws, collars and other small parts are easily lost. Temporarily attach these parts to their original positions. · When handling circuit boards use extreme care. Integrated circuits (microprocessors, ROM, and RAM) can be destroyed by static electricity. · Do not place printed circuit boards directly on conductive surfaces. · Follow the recommended procedures when replacing assemblies and units. · Perform the Printhead Gap Adjustment (Refer to Section 3.3 Print quality is darker on either side of the document. The following parts are replaced. Space Motor Assembly (Refer to Section 3.2.15 Carriage Shaft (Refer to Section 3.2.16 Guide Rail (Refer to Section 3.2.18 ) ) ) ) when the following occur.
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)
Page: 39
Service Guide ML390/391
Chapter 3 Maintenance & Disassembly
3.2 DISASSEMBLY/ASSEMBLY PROCEDURES General Information This section contains the printer disassembly procedures. Only the removal procedures are explained. Reverse the procedure for the installation. This Service Handbook lists the disassembly procedures for major components of the unit. Okidata does NOT recommend disassembling a unit which is operating normally. If you decide to perform disassembly during this training, Okidata recommends that you perform only the disassembly procedures for RSPL items. All other procedures are provided to assist you in identifying parts. It is not likely that you will perform these procedures while servicing the product. Read all notes, cautions, and warnings. They contain important information regarding assembly/disassembly. At the bottom of each procedure is a listing of the parts covered in that procedure. The Okidata part number, item description, applicable product, comment (RSPL, Option, Consumable), serial number revision level, and the cross-reference(s) to Appendix B are provided for each part. Items included in the Recommended Spare Parts List are indicated by the acronym RSPL. N/A appears where a part number is not available. Part Item Product Comment Revision App. B Number Description Reference Below is an explanation of the terms found in the Product Field of the parts list. 390 This part is found ONLY in the Microline 390 printer. 391 This part is found ONLY in the Microline 391 printer. 390 + This part is found ONLY in the Microline 390-Plus printer. 391 + This part is found ONLY in the Microline 391-Plus printer. Both This part is found in both the Microline 390 and 391 printers. Both + This part is found in both the Microline 390 and 391-Plus printers. Both 90 This part is found in both the Microline 390 and Microline 390-Plus printers. Both 91 This part is found in both the Microline 391 and Microline 391-Plus printers.
All This part is found in the Microline 390, Microline 391, Microline 390-Plus, and Microline 391-Plus printers. Compatibility - Microline 390/391 vs. Microline 390/391-Plus The differences between the Microline 390/391 and Microline 390/391-Plus printers are listed below. Hardware Differences · Operator Panel · Operator Board · Character Generator Programmable Read Only Memory (CGROM) · Programmable Read Only Memory (PROM) · Middle Cover Operational Differences · "Plus" printers have more resident fonts. · In the "Plus" printers, data in the receive buffer is printed upon receipt, without having to wait for a line terminator character (CR/LF or FF). · In the "Plus" printers, the DC1/DC3 Acknowledge/Ignore, Receive Buffer Size, and RESET inhibit can be controlled through the printers Menu. Serial Number Revision Levels Microline 390/391 A Rev A units are original production units. An interconnect module connects the power supply board to the main control board. B Rev B units are retrofitted to include a modified interconnect module, which prevents corrosion. C These units have a cable connection between the power supply board and the main control board. The cable connection wire replaces the interconnect module. Microline 390/391-Plus Revision levels do NOT apply to the "Plus" printers.
NOTE: Please refer to the parts lists for parts differentiation. Please be sure of the parts you need before ordering to avoid confusion and incorrect parts orders.
Printer Serial Number Identification There are three serial number revision levels for the printers. Hardware differences exist between levels. To identify the revision level of a printer, record the serial number from the back of the printer. Refer to the following to decode the serial number. Example Printer Serial Number: 401A0154693 Date Code 401 (4 = year. 01 = month) Revision A
Serial Number 0154693 Compatibility Chart
Item
Okidata P/N
Purpose / Function of Item
Printer Serial Number Revision Level 390/391A 390/391B 390/391C 390+ 391+
Main Control Board SKRA Board 55045401 Main Control Board Main Control Board Main Control Board Yes Yes No No No
SKRB Board
55038702
Yes
Yes
Yes
No
No
SKRA-3 Board
55045403
Yes
Yes
Yes
Yes
Yes
Power Supply Board PAII Board 55038801 Power Supply Board Power Supply Board Yes Yes No No No
SUII Board
55047401
Yes
Yes
Yes
Yes
Yes
Operator Panel Assembl y Panel: Operator Assembly 50069601 Operator Panel Assembly (390/391) Yes Yes Yes No No
Panel: Operator Assembly
50069610
Operator Panel Assembly (390/391Plus) Operator Panel Board (390/391) Operator Panel Board (390/391Plus)
No
No
No
Yes
Yes
PCB: LXSP
55045601
Yes
Yes
Yes
No
No
PCB: LXSP-5
55038605
No
No
No
Yes
Yes
Transfor mer 120 Volt XFRMR 56407201 Transfor mer (390 and 390-Plus) Transfor mer (391 and 391-Plus) Transfor mer (390 and 390-Plus) Transfor mer (391 and 391-Plus) Yes Yes Yes Yes Yes
120 Volt XFRMR
56407202
Yes
Yes
Yes
Yes
Yes
220 Volt XFRMR
56407801
Yes
Yes
Yes
Yes
No
220 Volt XFRMR
56407802
Yes
Yes
Yes
No
Yes
Interconn ect Module Interconn ect Module 55328301 Connects power supply board to main board Yes Yes No No No
Cable Cable 56616802 Connects power supply board to main board No No Yes Yes Yes
Cable Guide Cable Guide 51003801 Holds cable in place No No Yes Yes Yes
Covers Cover 53488301 Middle Cover (390) Middle Cover (391) Middle Cover (390-Plus ) Middle Cover (391-Plus ) Yes Yes Yes No No
Cover
53488401
Yes
Yes
Yes
No
No
Cover
53488316
No
No
No
Yes
No
Cover
53488422
No
No
No
No
Yes
Chassis Chassis 50061101 Chassis: Main (390 and 390-Plus) Yes Yes Yes Yes No
Chassis
50061201 Chassis: Main (391 and 391-Plus)
Yes
Yes
Yes
No
Yes
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)
Page: 40
Service Guide ML390/391
Chapter 3 Maintenance & Disassembly
3.2.01 Preliminary Items · Press the AC switch (1 shows location) and power OFF the printer. · Remove the paper, if installed. · Detach the AC power cord (2). · Detach the interface cable (3), if installed. P/N 56609701 Cord: AC 120 V All RSPL A B C B.2.02 , B.2.03 , B.2.03
P/N 56610801 Cord: AC (220 V) (ML Series) All Option RSPL A B C B.2.02 P/N 56616501 Cord: AC 240 V All Option A B C B.2.02 , B.2.03 , B.2.03
P/N 56624101 Cord: AC 220 V (ML) All Option A B C B.2.02
Right Angle
P/N 70000803 Kit: Parallel Interface Both Option A B C D N/A PlugnPlay Accessory
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)
Page: 41
Service Guide ML390/391
Chapter 3 Maintenance & Disassembly
3.2.02 Separator Assembly CAUTION:
To avoid damaging the ribbon protector, slide the printhead towards the center of the printer before removing the separator assembly.
· Perform this procedure: 3.2.01 · Open the access cover (1). · Move the paper bail lever (2) toward the front of the printer. · While pressing the release latches (3), tilt the separator assembly (4) toward the rear of the printer to release it from the platen shaft (5). · Remove the separator assembly. .
NOTES: The Rev A and B units used a metal ruler guide instead of the plastic separator assembly. The metal ruler guide is no longer available. To remove the metal ruler guide, follow this procedure. Open the access cover. Move the paper bail lever toward the front of the printer. Squeeze the retaining clips and tilt the ruler guide towards the rear of the printer. Remove the ruler guide.
P/N 50069801 Separator: Assembly (Narrow) Both 90 RSPL A B C B.2.04 P/N 50069901 Separator: Assembly (Wide) Both 91 RSPL A B C B.2.04 , B.2.06 , B.2.06
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)
Page: 42
Service Guide ML390/391
Chapter 3 Maintenance & Disassembly
3.2.03 Printhead Assembly WARNING: The printhead will be hot immediately after printing. Allow the printhead to cool before handling. · Perform this procedure: 3.2.01 · Open the access cover (1). · Remove the ribbon cartridge (2). · Move the printhead mounting clamp (3) in the direction of arrow A to unlock the printhead (4). · Lift and remove the printhead from the carriage frame (5). .
NOTE: When installing the printhead, push the printhead towards the platen.
P/N 50062201 Printhead: (Assembly) All RSPL A B C B.2.02 P/N 52104001 Ribbon All Consumable A B C B.2.12 , B.2.03
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)
Page: 43
Service Guide ML390/391
Chapter 3 Maintenance & Disassembly
3.2.04 Upper Cover Assembly · Perform this procedure: 3.2.01 .
· Wrap a rubber band around the wire extensions of the interface connector. This pulls the extensions in and avoids damage when the cover is removed. (Not shown). · Detach the platen knob (1). · Insert a flat-blade screwdriver through the slots (2) and disengage the claws of the cover. The Microline 390 and Microline 390-Plus have three slots. The Microline 391 and Microline 391-Plus have five slots. · Lift the front of the upper cover assembly (3) and remove the assembly. · The upper cover assembly contains the access cover assembly (4), the sheet separator assembly (5), the rear cover (6), and the middle cover (7) CAUTION:
Do NOT rotate the access cover past the vertical when removing it. The tab extensions can break. Before installing the cover, move the bail arm lever towards the back of the printer and move the release lever towards the front of the printer. After installation, verify that the cover is correctly seated in the front slots. The cover will warp if it is incorrectly installed. Check that the paper bail moves properly. When cleaning, refer to Section 3.4 of this Service Handbook
P/N 51901101 Knob: Platen All RSPL A B C B.2.02 , B.2.03
.
P/N 50060701 Cover: Access (Assembly) Both 90 RSPL A B C B.2.01 P/N 50060801 Cover: Access (Assembly) Both 91 RSPL A B C B.2.01 P/N 50060901 Separator: Sheet (Assembly) Both 90 RSPL A B C B.2.01 P/N 50061001 Separator: Sheet (Assembly) Both 91 RSPL A B C B.2.01 P/N 53488501 Frame: Rear Cover Both 90 RSPL A B C B.2.01 P/N 53488601 Frame: Rear Cover Both 91 RSPL A B C B.2.01 P/N 53488301 Cover: Middle (ML390) 390 RSPL A B C B.2.01 P/N 53488316 Cover: Middle (ML390+) 390+ RSPL A B C B.2.01 P/N