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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 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 ....3.3.01 Printhead Gap Adjustment 3.4 Cleaning 3.5 Lubrication 4 Failure & Repair Analysis
Page 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 78 79 80 81
Table of Contents Failure & Repair Analysis Introduction 4.4 Troubleshooting Tips ....4.4.02 Common Problems 4.5 Fault Alarms 4.6 Repair Analysis Procedures - Using The Raps 4.6.02 RAP Index ....4.6.03 Troubleshooting Cautions ........RAP 01A:Operator Panel Lamps Do Not Light - Rev A, B, and C ........RAP 01B: Operator Panel Lamps Do Not Light - Rev D ........RAP 02A: Abnormal Spacing - Rev A, B, and C ........RAP 02B:Abnormal Spacing - Rev D ........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 - Procedure 4.8 Resistance / Service Checks - Index To Charts ....4.8.02 Interconnect Diagrams (Rev A & B) ........Interconnect Diagrams (Rev C) ........Interconnect Diagrams (Rev D) ....4.8.03 Printhead ....4.8.04 Space Motor ....4.8.05 Line Feed Motor ....4.8.06 Operator Panel Board (Rev A, B, & C) ........Operator Panel Board (Rev D) ....4.8.07 Control Board (Rev A - D) 4.9 Printer Tests ....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 Reference Charts A.1 Board Diagrams A.2 Index To Charts (A, B, C, D) ....A.2.01 Control Board (LXMC) - Rev A and B ........A.2.02 Control Board (LXMC-3) - Rev C ........A.2.03 Control Board (LXMR) - Rev D ....A.2.04 Power Supply (PAII-2) - Rev A and B ........A.2.05 Power Supply (SUII-2) - Rev C
Page 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123
Table of Contents ....A.2.06 Filter Assembly - Rev A, B, C, and D ....A.2.07 Operator Panel (LXSP) - Rev A, B, and C ........A.2.08 Operator Panel (LXON) - Rev D ....A.2.09 RS232-C Serial Interface (LXHI) - Rev A, B, C, and D B Illustrated Parts Listing Illustrated Parts Listing - General Information ....B.1.02 Definitions of Terms B.2 Index to Illustrated Parts Breakdown Charts ....B.2.01 Covers - Rev A, B, and C ........B.2.02 Covers - Rev D ....B.2.03 Electrical Components - Rev A and B ........B.2.04 Electrical Components - Rev C ........B.2.05 Electrical Components - Rev D ....B.2.06 Printer Mechanism - Rev A and B (1 of 2) ....B.2.07 Printer Mechanism - Rev A and B (2 of 2) ....B.2.08 Printer Mechanism - Rev C (1 of 2) ....B.2.09 Printer Mechanism - Rev C (2 of 2) ....B.2.10 Printer Mechanism - Rev D (1 of 2) ....B.2.11 Printer Mechanism - Rev D (2 of 2) ....B.2.12 Operator Panel - Rev A, B, C, and D ....B.2.13 Carriage Assembly - Rev A, B, C, and D ....B.2.14 Tractor Assembly - Rev A, B, C, and D ....B.2.15 Options - Rev A, B, C, and D ....B.2.16 Consumables - Rev A, B, C, and D ....B.2.17 Packaging - Rev A, B, C, and D ....B.2.18 Documentation - Rev A, B, C, and D
Page 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148
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Service Guide ML320/ML321
Chapter 0 About This Manual
Manual Copyright This document may not be reproduced without written permission of the Okidataź 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 its control. © 1994 by Okidata All rights reserved. P/N 59231501 First Edition May, 1988 Microline 320/321 Training Manual P/N 59231501 [Second Release May, 1990] Microline 320/321 Training Manual P/N 59263401 First Edition February, 1994 Microline 320/321 Service Handbook P/N 59263401 Second Revision July, 1994 Microline 320/321 Service Handbook 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 ML320/ML321
Chapter 0 About This Manual
Manual Part Number and Revision
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 ML320/ML321
Chapter 1 Product Specifications
1.1
GENERAL DESCRIPTION
The Microline 320 and Microline 321 are nine pin, dot matrix printers. Two versions of the printers are available. The first provides Microline emulation. The second version provides Epson and IBM Proprinter emulations, which are selected through the Printer Menu. The major difference between the Microline 320 and Microline 321 is the width of each printer. The Microline 320 can handle 80 print columns (at 10 CPI). The Microline 321 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)
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Service Guide ML320/ML321
Chapter 1 Product Specifications
1.1.02 Serial Number Identification & (A-D) Revision Levels 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 Rev C units have a cable harness connection between the power supply board and the main control board. The cable harness replaces the interconnect module. D Rev D units have no power supply board. The circuitry for the power supply board has been incorporated on the main control board. Please Note the following: The Rev C main control board (LXMC) and power supply board (SUII) are downward compatible with Rev A and B units. The Rev A and Rev B main control board (LXMC) and power supply board (PAII) cannot be used in Rev C units. Rev D units do NOT use Rev A, Rev B, or Rev C main control boards, transformers, operator panels, upper covers, and lower covers. Rev D units have a unique main control board (LXMR), no power supply board, a 50 volt transformer, and a unique operator panel (LXON).
NOTE: Please refer to the parts lists (Appendix B( )) 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 four serial number revision levels for the Microline 320 and 321 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: 401D0154693 Date Code 401 (4 = year. 01 = month) Revision D Serial Number 0154693
Item
Okidata P/N 55041411 55041412 55075111
Purpose / Function of Item
A
B
C
D
LXMC Board LXMC3 Board LXMR
Main Control Board Main Control Board Main Control Board (with SSD)
Yes Yes No
Ye s Ye s No
No Ye s No
No No Ye s
Power Supply Board
Item
Okidata P/N 55039902 55047402 N/A
Purpose / Function of Item
A
B
C
D
PAII-2 Board SUII-2 Board N/A
Power Supply Board Power Supply Board Power supply function included on the Main Control Board
Yes Yes No
Ye s Ye s No
No Ye s No
No No Ye s
Operator Panel Assembly Item Okidata P/N 55038602 55075011 50069603 50107426 Purpose / Function of Item A B C D
LXSP-2 LXON N/A N/A
Operator Panel Board Operator Panel Board (with SSD) Operator Panel Bezel Operator Panel Bezel (with SSD)
Yes No Yes No
Ye s No Ye s No
Ye s No Ye s No
No Ye s No Ye s
Transformer Item Okidata P/N 56407503 Purpose / Function of Item A B C D
120 Volt XFRMR
Transformer - Microline 320
Yes
Ye s
Ye s
No
120 Volt XFRMR 120 Volt XFRMR 120 Volt XFRMR
56407502
Transformer - Microline 321
Yes
Ye s No
Ye s No
No
56413201
Transformer - Microline 320 (with SSD) Transformer - Microline 321 (with SSD)
No
Ye s Ye s
56413202
No
No
No
Interconnect Module Item Okidata P/N 55328301 Purpose / Function of Item A B C D
Interco nnect Module
Connects power supply board to main board
Yes
Ye s
No
No
Cable Item Okidata P/N 56616802 Purpose / Function of Item A B C D
Cable
Connects power supply board to main board
No
No
Ye s
No
Cable Guide Item Okidata P/N 51003801 Purpose / Function of Item A B C D
Cable Guide
Holds cable in place
No
No
Ye s
Ye s
Covers Item Okidata P/N 53488302 53488402 Purpose / Function of Item A B C D
Cover Cover
Middle Cover - Microline 320 Middle Cover - Microline 321
Yes Yes
Ye s Ye s
Ye s Ye s
No No
Cover Cover
53070701 53070801
Middle Cover - Microline 320 (with SSD) Middle Cover - Microline 321 (with SSD)
No No
No No
No No
Ye s Ye s
Chassis Item Okidata P/N 50061101 50061201 50104501 50104601 Purpose / Function of Item A B C D
Chassis Chassis Chassis Chassis
Middle Cover - Microline 320 Middle Cover - Microline 321 Middle Cover - Microline 320 (with SSD) Middle Cover - Microline 321 (with SSD)
Yes Yes No No
Ye s Ye s No No
Ye s Ye s No No
No No Ye s Ye s
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 ML320/ML321
Chapter 1 Product Specifications
Compatibility Chart
Item
Okidata P/N 55041411 55041412 55075111
Purpose / Function of Item
A
B
C
D
LXMC Board LXMC3 Board LXMR
Main Control Board Main Control Board Main Control Board (with SSD)
Yes Yes No
Ye s Ye s No
No Ye s No
No No Ye s
Power Supply Board
Item
Okidata P/N 55039902 55047402 N/A
Purpose / Function of Item
A
B
C
D
PAII-2 Board SUII-2 Board N/A
Power Supply Board Power Supply Board Power supply function included on the Main Control Board
Yes Yes No
Ye s Ye s No
No Ye s No
No No Ye s
Operator Panel Assembly Item Okidata P/N 55038602 55075011 50069603 50107426 Purpose / Function of Item A B C D
LXSP-2 LXON N/A N/A
Operator Panel Board Operator Panel Board (with SSD) Operator Panel Bezel Operator Panel Bezel (with SSD)
Yes No Yes No
Ye s No Ye s No
Ye s No Ye s No
No Ye s No Ye s
Transformer Item Okidata P/N 56407503 Purpose / Function of Item A B C D
120 Volt XFRMR 120 Volt XFRMR 120 Volt XFRMR 120 Volt XFRMR
Transformer - Microline 320
Yes
Ye s Ye s No
Ye s Ye s No
No
56407502
Transformer - Microline 321
Yes
No
56413201
Transformer - Microline 320 (with SSD) Transformer - Microline 321 (with SSD)
No
Ye s Ye s
56413202
No
No
No
Interconnect Module Item Okidata P/N 55328301 Purpose / Function of Item A B C D
Interco nnect Module
Connects power supply board to main board
Yes
Ye s
No
No
Cable Item Okidata P/N 56616802 Purpose / Function of Item A B C D
Cable
Connects power supply board to main board
No
No
Ye s
No
Cable Guide Item Okidata P/N 51003801 Purpose / Function of Item A B C D
Cable Guide
Holds cable in place
No
No
Ye s
Ye s
Covers
Item
Okidata P/N 53488302 53488402 53070701 53070801
Purpose / Function of Item
A
B
C
D
Cover Cover Cover Cover
Middle Cover - Microline 320 Middle Cover - Microline 321 Middle Cover - Microline 320 (with SSD) Middle Cover - Microline 321 (with SSD)
Yes Yes No No
Ye s Ye s No No
Ye s Ye s No No
No No Ye s Ye s
Chassis Item Okidata P/N 50061101 50061201 50104501 50104601 Purpose / Function of Item A B C D
Chassis Chassis Chassis Chassis
Middle Cover - Microline 320 Middle Cover - Microline 321 Middle Cover - Microline 320 (with SSD) Middle Cover - Microline 321 (with SSD)
Yes Yes No No
Ye s Ye s No No
Ye s Ye s No No
No No Ye s Ye s
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 ML320/ML321
Chapter 1 Product Specifications
1.2
PRODUCT SPECIFICATIONS
1.2.01 Print Method Impact Dot Matrix Number of Print Wires: 9 Print Wire Diameter: .013 inch (.34 mm) 1.2.02 Print Modes Revs A, B, and C High Speed Draft (HSD) Utility Near Letter Quality (NLQ) Rev D Super Speed Draft (SSD) High Speed Draft (HSD) Utility Near Letter Quality (NLQ) 1.2.03 Character Pitches 10 CPI 12 CPI 17.1 CPI 20 CPI Proportional (not available in High Speed Draft mode) 1.2.04 Character Sets Standard (Microline) Version Standard ASCII IBM Line Graphics Down-Line Loadable (DLL) Block Graphics Epson/IBM Version Character Set I Character Set II DLL (not available through Menu) NOTES: Characters Per Inch = cpi Characters Per Second = cps Dots Per Inch = dpi Character Sets are selected through the Menu
1.2.05 Print Speed NOTE: Super Speed Draft (SSD) is available ONLY with Rev D units. Character Pitch
Print Mode SSD HSD Utility NLQ
10 cpi N/A 300 cps 250 cps 62.5 cps
12 cpi 360 cps 300 cps 250 cps 62.5 cps
17.1cpi N/A 300 cps 250 cps 62.5 cps
20 cpi N/A 300 cps 250 cps 62.5 cps
Print Speed at Different CPI for the ML 320/321 Mode SSD HSD CPI 12 10 12 17.1 20 Utility 10 12 17.1 20 LQ (2 Pass Print) 10 12 17.1 20 CPS 360 300 300 300 300 250 250 250 250 62.5 62.5 62.5 62.5 Horiz. DPI 192 100 120 171 200 120 144 206 240 240 288 412 480 Vert DPI LPS 30.0 30.0 25.0 17.5 15.0 25.0 20.8 14.6 12.5 6.25 5.20 3.64 3.12
1.2.06 Print Resolution NOTE: Super Speed Draft (SSD) is available ONLY with Rev D units. Character Pitch 12 cpi 17.1cpi 120 dpi 171.4 dpi 144 dpi 205.7 dpi 288 dpi 411.4 dpi
Print Mode HSD Utility NLQ
10 cpi 100 dpi 120 dpi 240 dpi
20 cpi 200 dpi 240 dpi 480 dpi
1.2.07 Character Matrix Sizes NOTE: SSD is available ONLY with Rev. D units. PRINT MODE SSD HSD Utility NLQ MATRIX SIZE 7x7 7X7 9X7 17 X 13
1.2.08 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/72", n/144", n/288" and n/216". Line Feed Timing 70 ms @ 6 lines per inch 60 ms @ 8 lines per inch Slew Rate: 4.5 inches per second (Continuous Feed Paper)
1.2.09 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: 8
Service Guide ML320/ML321
Chapter 1 Product Specifications
1.3
PAPER SPECIFICATIONS
1.3.01 Width Microline 320 Minimum: 3 inches (76.2 mm) Maximum: 10 inches (254 mm) Microline 321 Minimum: 3 inches (76.2 mm) Maximum: 16 inches (406.4 mm) 1.3.02 Single Part Forms Weight Minimum: 12 pound (45 g/m2) Maximum: 24 pound (90 g/m2) Thickness Maximum: 0.014 inches (0.356 mm) 1.3.03 Multipart Forms - Carbon Lined or Pressure Sensitive Weight Minimum: 9 pound (35 g/m2) Maximum: 11 pound (40 g/m2) Thickness Maximum: 0.014 inches (0.356 mm) Number of Copies Original plus four copies 1.3.04 Multipart - Interleaf Weight Paper Minimum: 10 pound (38 g/m2) Maximum: 12 pound (45 g/m2) Carbon Maximum: 9 pound (35 g/m2) Thickness Maximum: 0.014 inches (0.356 mm) Number of Copies Original plus four copies 1.3.05 Cut Sheets (Single Part ONLY) Friction Feed Weight Minimum: 12 pound (45 g/m2) Maximum: 24 pound (90 g/m2) Thickness Maximum: 0.014 inches (0.356 mm) Cut Sheet Feeder 3000 Weight Minimum: 12 pound (45 g/m2)
Maximum: 24 pound (90 g/m2) Thickness Maximum: 0.014 inches (0.356 mm) 1.3.06 Envelopes (Individual) Weight Maximum: 24 pound maximum (90 g/m2) Thickness Maximum: 0.016 inches (0.41 mm) Dimensions 6.5 inches x 3 5/8 inches 8 7/8 inches x 3 7/8 inches 9.5 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/m2) 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: Weight Maximum: 100 pound (150 g/m2) 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. Card Stock should be used ONLY with bottom feed. Set the head gap at Position 2 for 100 pound card stock.
Carrier Width Maximum: 8.5 inches (216 mm) Microline 320 Maximum: 15 inches (381 mm) Microline 321 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: 9
Service Guide ML320/ML321
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 320 321 Height 4.6" 4.6" Width 15.7" 21.7" Depth 13.6" 13.6"
1.4.02 Weight Microline 320 Revs A, B, and C: Rev D: Microline 321 Revs A, B, and C: Rev D:
16 pounds 17.2 pounds (7.8 kg)
20 pounds 22.2 pounds (10.1 kg)
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 ML320/ML321
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 +10%, -15% Frequency 50/60 Hz +/- 2% 1.5.02 Power Consumption Revs A, B, and C Operating: 315 VA Idle: 80 VA Rev D Operating: 70 VA Idle: 25 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: 11
Service Guide ML320/ML321
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
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Page: 12
Service Guide ML320/ML321
Chapter 1 Product Specifications
1.7
AGENCY APPROVALS 1.7.01 Listings Revs A, B, C, and D UL Standard No. 478 CSA Standard C22.2 No. 220 FCC Part 15, Subject J, Class B Revs A, B, and C VDE 0806, VDC 0875 Class B BS5850 Rev D VDE 0806, VFG 0243 Class B BS7002
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 ML320/ML321
Chapter 1 Product Specifications
1.8
OPTIONS Pull Tractor with Acoustic Cover Cut Sheet Feeder with Access Cover (CSF-3000A) Super-Speed RS232-C Serial Interface Board
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Page: 14
Service Guide ML320/ML321
Chapter 1 Product Specifications
1.9
CONSUMABLES 1.9.01 Cartridge Ribbon Black 3 million character ribbon life Re-inking cartridge
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Page: 15
Service Guide ML320/ML321
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
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 ML320/ML321
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 3 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: 17
Service Guide ML320/ML321
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. 1) 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). 2) Electrical Operation ( ) This section views the printer functions from an electrical perspective. 3) Mechanical Operation ( ) This section views the printer functions from a mechanical perspective.
Serial Number Identification & (A-D) Revision Levels 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 Rev C units have a cable harness connection between the power supply board and the main control board. The cable harness replaces the interconnect module. D Rev D units have no power supply board. The circuitry for the power supply board has been incorporated on the main control board. Please Note the following: The Rev C main control board (LXMC) and power supply board (SUII) are downward compatible with Rev A and B units. The Rev A and Rev B main control board (LXMC) and power supply board (PAII) cannot be used in Rev C units. Rev D units do NOT use Rev A, Rev B, or Rev C main control boards, transformers, operator panels, upper covers, and lower covers. Rev D units have a unique main control board (LXMR), no power supply board, a 50 volt transformer, and a unique operator panel (LXON).
NOTE: Please refer to the parts lists (Appendix B) 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 four serial number revision levels for the Microline 320 and 321 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: 401D0154693 Date Code 401 (4 = year. 01 = month) Revision D Serial Number 0154693 For more information see the compatibility chart ( ).
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Chapter 2 Principles of Operation
2.2
CIRCUIT BOARD DESCRIPTION
Operator Panel Board Power Supply Control Board Large Scale Intergrated Circuitry
( ( ( (
) ) ) )
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Chapter 2 Principles of Operation
2.2.01 Operator Panel Board Rev A, B, C, and D The operator panel board contains switches and LED's which allow the end user to control and monitor the printer's operation. For specific information on the capabilities and use of the operator panel, please refer to Chapter 4 ( ) in the Printer Handbook. 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)
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Chapter 2 Principles of Operation
2.2.02 Power Supply Rev A, B, and C 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 + 8 vdc, + 40 vdc, and + 5 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. Rev D The power supply consists of the power transformer, a filter board, and power supply circuitry (located on the main controller board). The input AC voltage is stepped down to 8.6 VAC, 46 VAC, and 10 VAC by the power transformer. These AC voltages are rectified into + 8 vdc, + 5 vdc, and + 50 vdc levels by the DC power supply circuitry on the main controller board.
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Chapter 2 Principles of Operation
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 Q7 - 80C154. For the Rev D printers, the microprocessor is Q1 - 80C154. Program Read Only Memory (ROM) The printer's control program and resident character fonts are 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 Q13 - 128 kilobytes. For the Rev D printers, the Program ROM is Q4 - 64 kilobytes. Random Access Memory (RAM ) The RAM stores the following information. Data to be printed (Receive Buffer) All character fonts Q12 has a battery backup. Data is retained even after power is removed. 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)
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Chapter 2 Principles of Operation
Large Scale Integrated Circuitry (LSI) For the Rev A, B, and C printers, the LSI is Q11 - MSM6990 For the Rev D printers, the LSI is Q3 - 7U042-026. 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 printer's 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.
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Service Guide ML320/ML321
Chapter 2 Principles of Operation
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 ( ( ( ( ( ( ) ) ) ) ) )
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Chapter 2 Principles of Operation
2.3.01 Initialization In Rev A, B, and C printers, initialization occurs whenever the printer is powered ON or when the signal I-PRIME is received at the parallel interface. In Rev D printers, initialization occurs whenever the printer is powered ON, or when the RSTOUT signal is sent from the reset circuit (Q11) Pin 2 to Q1 and Q3. The initialization sequence is as follows. In Rev A, B, and C printers, Q7 and Q11 are reset. In Rev D printers, Q1 and Q3 are reset. In Rev A, B, and C printers, the operating modes of Q7 and Q11 are set. In Rev D printers, the operating modes of Q1 and Q3 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 then establishes the interface signals (ACK, BUSY) and the SEL lamp lights.
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Chapter 2 Principles of Operation
2.3.02 Interface Control Parallel Interface In Rev A, B, and C printers, the data from the host is input through connector CN5 to the interface LSI Q11. In Rev D printers, the data from the host is input through connector CN6 to the interface LSI Q3. 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)
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Chapter 2 Principles of Operation
2.3.03 Print Head Drive Circuit This circuit drives the printhead coils (1 through 9) using the HD ON signal, along with the nine HD DATA signals. The pulsewidth of HD ON 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)
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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. 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.
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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 LF03 and LF04, 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.
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Chapter 2 Principles of Operation
2.3.06 Alarm Circuit 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 (Rev A, B, and C: 40 volts. Rev D: 50 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 In order to protect the printhead coils, this circuit uses the printhead's built-in thermistor to monitor printhead temperature. Printhead temperature rises when the unit is printing. When printhead temperature reaches 110 degrees Celsius, the HEAD OVERHEAT alarm is generated. Printing stops when this alarm is detected. This allows the printhead temperature to fall. When the printhead temperature falls below the alarm detection level, printing is resumed. Here is a description of the alarm detection. When the temperature of the printhead rises, the resistance of the thermistor decreases and the potential falls at the negative input of comparator Q6. Q6 is located on the main controller board. This inverts the comparator output, causing the HEAD TEMP signal to be sent to the motor control LSI. 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 to become low. This signal is fed to a pin of the motor control LSI. Printing stops and the ALARM lamp lights.
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Service Guide ML320/ML321
Chapter 2 Principles of Operation
2.4
MECHANICAL PRINCIPLES OF OPERATION
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Chapter 2 Principles of Operation
2.4.01 Printhead 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 nine 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. The printhead contains a built-in thermistor (rated at 110 degrees Celsius). The thermistor monitors the printhead temperature. If the temperature exceeds the 110 degrees Celsius, the thermistor causes a signal to be generated on the main controller board. The printer stops printing. A BUSY signal is sent to the host computer. Data remains in the print buffer as long as power is supplied to the printer. When the printhead temperature drops below the 110 degree Celsius threshold, the BUSY signal to the host computer becomes inactive. Printing is resumed.
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Service Guide ML320/ML321
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)
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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. Setting 3 is for envelopes and extra-thick paper. When the adjusting lever is set to position 3, 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.
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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)
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Chapter 2 Principles of Operation
2.4.04 Paper Feed Mechanism The paper feed mechanism consists of the following items. Stepper 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.
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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)
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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.
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Service Guide ML320/ML321
Chapter 3 Maintenance & Disassembly
Maintenance & Disassembly This chapter consists of the following sections: Disassembly / Assembly Procedures Adjustments Cleaning Lubrication ( ) ( ) ( ) ( )
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Service Guide ML320/ML321
Chapter 3 Maintenance & Disassembly
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. 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 (capable of measuring .002, .016, and .018 inches) 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
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. Since screws, collars and other small parts are easily lost, they should be temporarily attached to the 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.
Platen Assembly (Refer to Section 3.2.19 (
Serial Number Identification & (A-D) Revision Levels 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 Rev C units have a cable harness connection between the power supply board and the main control board. The cable harness replaces the interconnect module. D Rev D units have no power supply board. The circuitry for the power supply board has been incorporated on the main control board. Please Note the following: The Rev C main control board (LXMC) and power supply board (SUII) are downward compatible with Rev A and B units. The Rev A and Rev B main control board (LXMC) and power supply board (PAII) cannot be used in Rev C units. Rev D units do NOT use Rev A, Rev B, or Rev C main control boards, transformers, operator panels, upper covers, and lower covers. Rev D units have a unique main control board (LXMR), no power supply board, a 50 volt transformer, and a unique operator panel (LXON).
NOTE: Please refer to the parts lists (Appendix B) 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 four serial number revision levels for the Microline 320 and 321 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: 401D0154693 Date Code 401 (4 = year. 01 = month) Revision D Serial Number 0154693
Item
Okidata P/N 55041411 55041412 55075111
Purpose / Function of Item
A
B
C
D
LXMC Board LXMC3 Board LXMR
Main Control Board Main Control Board Main Control Board (with SSD)
Yes Yes No
Ye s Ye s No
No Ye s No
No No Ye s
Power Supply Board
Item
Okidata P/N 55039902 55047402 N/A
Purpose / Function of Item
A
B
C
D
PAII-2 Board SUII-2 Board N/A
Power Supply Board Power Supply Board Power supply function included on the Main Control Board
Yes Yes No
Ye s Ye s No
No Ye s No
No No Ye s
Operator Panel Assembly Item Okidata P/N 55038602 Purpose / Function of Item A B C D
LXSP-2
Operator Panel Board
Yes
Ye s
Ye s
No
LXON N/A N/A
55075011 50069603 50107426
Operator Panel Board (with SSD) Operator Panel Bezel Operator Panel Bezel (with SSD)
No Yes No
No Ye s No
No Ye s No
Ye s No Ye s
Transformer Item Okidata P/N 56407503 Purpose / Function of Item A B C D
120 Volt XFRMR 120 Volt XFRMR 120 Volt XFRMR 120 Volt XFRMR
Transformer - Microline 320
Yes
Ye s Ye s No
Ye s Ye s No
No
56407502
Transformer - Microline 321
Yes
No
56413201
Transformer - Microline 320 (with SSD) Transformer - Microline 321 (with SSD)
No
Ye s Ye s
56413202
No
No
No
Interconnect Module Item Okidata P/N 55328301 Purpose / Function of Item A B C D
Interco nnect Module
Connects power supply board to main board
Yes
Ye s
No
No
Cable Item Okidata P/N 56616802 Purpose / Function of Item A B C D
Cable
Connects power supply board to main board
No
No
Ye s
No
Cable Guide
Item
Okidata P/N 51003801
Purpose / Function of Item
A
B
C
D
Cable Guide
Holds cable in place
No
No
Ye s
Ye s
Covers Item Okidata P/N 53488302 53488402 53070701 53070801 Purpose / Function of Item A B C D
Cover Cover Cover Cover
Middle Cover - Microline 320 Middle Cover - Microline 321 Middle Cover - Microline 320 (with SSD) Middle Cover - Microline 321 (with SSD)
Yes Yes No No
Ye s Ye s No No
Ye s Ye s No No
No No Ye s Ye s
Chassis Item Okidata P/N 50061101 50061201 50104501 50104601 Purpose / Function of Item A B C D
Chassis Chassis Chassis Chassis
Middle Cover - Microline 320 Middle Cover - Microline 321 Middle Cover - Microline 320 (with SSD) Middle Cover - Microline 321 (with SSD)
Yes Yes No No
Ye s Ye s No No
Ye s Ye s No No
No No Ye s Ye s
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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. 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 Number
Item Description
Product
Comment
Revision
App. B Reference
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. Be sure to read all notes, cautions, and warnings, as they contain important information regarding assembly/disassembly.
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 ML320/ML321
Chapter 3 Maintenance & Disassembly
3.2.01 Preliminary Items 1) Press the AC switch (1 shows location) and power OFF the printer. 2) Remove the paper, if installed. 3) Detach the AC power cord (2). 4) Detach the interface cable (3), if installed.
Part Number
Item Description
Product
Commen t RSPL Option RSPL Option
Revision
App. B Reference
P/N 56609701 P/N 56624101 P/N 56616501
Cord: AC 120 V Cord: AC (220 V) (Right Angle for ML Series) Cord: AC 240V
Both Both
ABCD ABCD
B.2.03 04 05 B.2.03 04 05
Both
ABCD
B.2.03 04
P/N 56624401 P/N 70000803
Cord: AC 240V Kit: Parallel Interface Plug'n'Play Accessory
Both Both
Option Option
ABCD ABCD
B.2.05 N/A
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 ML320/ML321
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 these procedures first: - 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.
Part Number
Item Description
Product
Commen t RSPL
Revision
App. B Reference
P/N 50069801 P/N 50069901
Separator: Assembly (Narrow) Separator: Assembly (Wide)
320
ABCD
B.2.06 08 10
321
RSPL
ABCD
B.2.06 08 10
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 ML320/ML321
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 these procedures first: - 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.
Part Number P/N 50063802 P/N 52102001
Item Description Printhead: (Assembly) Ribbon
Product Both
Comment RSPL
Revision ABCD
App. B Reference B.2.03 04 05
Both
Consumable
ABCD
B.2.16
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: 44
Service Guide ML320/ML321
Chapter 3 Maintenance & Disassembly
3.2.04 Upper Cover Assembly Perform these procedures first: - 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. (Notshown). - Detach the platen knob (1). - Insert a flat-blade screwdriver through the slots (2) and disengage the claws of the cover. The Microline 320 has three slots. The Microline 321 has 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.
The Rev D middle cover is NOT compatible with the Rev A, B, and C middle cover.
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.
Part Number P/N 51901101 P/N 50060701 P/N 50060801 P/N 50060901 P/N 50061001 P/N 53488501 P/N 53488601 P/N 53488302 P/N 53488402 P/N 53070801 P/N 53070701
Item Description Knob: Platen
Product Both
Comment RSPL
Revision ABCD
App. B Reference B.2.03 04 05
Cover: Access (Assembly) Cover: Access (Assembly) Separator: Sheet (Assembly) Separator: Sheet (Assembly) Frame: Rear Cover
320
RSPL
ABCD
B.2.01 02
321
RSPL
ABCD
B.2.01 02
320
RSPL
ABCD
B.2.01 02
321
RSPL
ABCD
B.2.01 02
320
RSPL
ABCD
B.2.01 02
Frame: Rear Cover
321
RSPL
ABCD
B.2.01 02
Cover: Middle
320
RSPL
ABC
B.2.01
Cover: Middle
321
RSPL
ABC
B.2.01
Cover: Middle (SSD)
321
RSPL
D
B.2.02
Cover: Middle (SSD)
320
RSPL
D
B.2.02
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: 45
Service Guide ML320/ML321
Chapter 3 Maintenance & Disassembly
3.2.05 Operator Panel Assembly NOTE: The operator panel assembly and board for the Rev D units are NOT compatible with the Rev A, B, and C operator panel assembly and board. Perform these procedures first: - 3.2.01 ( - 3.2.04 ( ) )
- Release the claws (1) and remove the operator panel assembly (2) from the chassis (3). As the operator panel assembly is removed, it must be detached from the connector (4) on the control board (5). - Release the eight claws (6) and remove the operator board (7) from the bezel (8).
Part Number P/N 50069603
Item Description Panel: Operation w/Frame
Product Both
Comment RSPL
Revision ABC
App. B Reference B.2.12 (Assembly)
P/N 53490101 P/N