OKIDATA OKIPAGE 20 User manual

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Page: 1
Service Manual - OKIPAGE20
Chapter 0 Introduction
OKIPAGE 20 / OKIPAGE 20 DX / OKIPAGE 20 DXn
LED PAGE PRINTER PRODUCTS
Adobe Acrobat printable reference copy
of the OKIDATA Service Training Manual.
03/20/98
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 display well
on most displays.
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 Manual - OKIPAGE20
0 Introduction
Copyright 1
Preface 2
1 Configuration
1.1 System Configuration 3
1.2 Printer Configuration 4
1.3 Optional Configuration 5
1.4 Specification 6
1.5 Safety Standards 7
....1.5.1 Certification Label 8
....1.5.2 Warning label 9
2 Operation Description
2.0 Operation Description 10
2.1 Main Control Board (BOARD-AAA) 11
2.2 Power Supply Unit 12
2.3 Electro-photographic Process 13
....2.3.1 Electro-photographic process mechanism 14
....2.3.2 Electro-photographic process 15
....2.3.3 Process operation descriptions 16
....2.3.4 Revision of LED Head Illumination 17
2.4 Paper Jam Detection 18
2.5 Cover Open 19
2.6 Toner Low Detection 20
2.7 Stacker-full Detection 21
2.8 Paper Size Detection 22
2.9 PostScript ROM module (BOARD-MSM or BOARD-FSL) 23
3 Parts Replacement
3.0 Parts Replacement 24
3.1 Precautions for Parts Replacements 25
3.2 Parts Layout 26
3.3 How to Change Parts 27
....3.3.1 Face -up Stacker Assy 28
....3.3.2 Contact Assy 29
....3.3.3 DC Fan Motor 30
....3.3.4 OP Panel Assy 31
....3.3.5 Board-AAA 32
....3.3.6 Stacker Assy, Damper Arm, Cover Rear 33
....3.3.7 Sensor Stacker Full 34
....3.3.8 Cable cover (guide film) 35
....3.3.9 Damper 36
....3.3.10 Feeder Unit-Front 37
....3.3.11 Roller Assy-Regist 38

Table of Contents Page
....3.3.12 Motor -Main 39
....3.3.13 Guide Assy-Eject 40
....3.3.14 Heat Assy 41
....3.3.15 Roller feed (C) 42
....3.3.16 Roller Assy-BK 43
....3.3.17 Roller Assy-Feed 44
....3.3.18 LED Head 45
....3.3.19 Paper cassette, ROLLER Ass-Feed,
ROLLER-Assy-Hopping 46
....3.3.20 Frame Assy-Separation 47
....3.3.21 Transfer Roller/TR Gear/TR Bearing 48
....3.3.22 EP lock shaft 49
....3.3.23 LEVER Assy- Out Sensor 50
....3.3.24 Toner sensor lever 51
....3.3.25 Paper sensor lever 52
....3.3.26 Inlet sensor lever 53
....3.3.27 Power supply unit 54
....3.3.28 Lever-Paper end & Lever-Paper near end 55
....3.3.29 Guide Assy-Cassette (L) 56
....3.3.30 Guide Assy-Cassette (R) 57
4 Adjustment
4.0 Adjustment 58
....4.1 Maintenance Mode and Functions 59
........User maintenance mode 60
........System maintenance mode 61
........Engine maintenance mode 62
........4.1.1 User maintenance mode 63
........4.1.2 System maintenance mode 64
........4.1.3 Engine maintenance mode 65
........4.1.4 EEPROM Initialization 66
....4.2 Adjustment When Replacing a Part 67
........4.2.1 Resetting the fuser counter 68
........4.2.2 Destination setting 69
5 Periodic Maintenance
5.1 Period Replacing Part 70
5.2 Cleaning 71
....5.2.1 Cleaning of LED lens array 72
....5.2.2 Cleaning the Plastic Film 73
6 Troubleshooting Procedures
6.1 Troubleshooting Tips 74
6.2 Points to Check before Correcting Image Problems 75
6.3 Tips for Correcting Image Problems 76
6.4 Preparation for Troubleshooting 77
6.5 Troubleshooting Flow 78

Table of Contents Page
....6.5.1 LCD status message/trouble list 79
....6.5.2 LCD message troubleshooting 80
....6.5.3 Image troubleshooting 81
7 Wiring Diagram
7.1 Interconnect Signal Diagram 82
7.2 PCB Layout 83
7.3 Resistance Check 84
7.4 Program/Font ROM Location 85
8 Parts List
Figure 8-1 Printer Unit 86
Table 8-1 Printer Unit 87
Figure 8-2 Frame-Main Unit 88
Table 8-2 Frame-Main Unit 89
Figure 8-3 Base Unit 90
Table 8-3 Base Unit 91
A Centronics Parallel Interface
Centronics Parallel Interface 92
B RS-232C Serial Interface
RS-232C Serial Interface 93
C Duplex Unit
1. OUTLINE 94
....1.1 Functions 95
....1.2 External View and Component Names 96
2.0 Mechanism Description 97
....2.1 General Mechanism 98
....2.2 JAM Release Mechanism 99
....2.3 Removing/Installing Duplex Unit 100
3.0 Parts Replacement 101
....3.1 Precautions Concerning Parts Replacement 102
....3.2 Parts Layout 103
....3.3 Parts Replacement Methods 104
........3.3.1 Board-LEX 105
........3.3.2 Connector (IMSA-9714N-14A) 106
........3.3.3 Photo Sensor 107
........3.3.4 SOLENOID Assy 108
........3.3.5 Motor 109
4.0 Troubleshooting 110
....4.1 Precautions Prior to the Troubleshooting 111
....4.2 Preparations for the Troubleshooting 112
....4.3 Troubleshooting Method 113
........4.3.1 LCD Status Message List 114
........4.3.2 Troubleshooting Flow 115
5.0 Connection Diagram 116
....5.1 Interconnection Diagram 117

Table of Contents Page
....5.2 PCB Layout 118
6.0 Parts List 119
Table 6-1 Duplex Unit 120
D Second / Third Paper Feeder
1.0 Outline 121
....1.1 Functions 122
....Appearance and Parts Name 123
2.0 Description of operation 124
....2.1 Driving Mechanism 125
....2.2 Hopper Mechanism 126
3.0 Parts Replacement 127
....3.1 Precautions Concerning Parts Replacement 128
....3.2 Parts Layout 129
....3.3 Parts Replacement Methods 130
........3.3.1 Roller assy hopping, Roller assy feed 131
........3.3.2 Cover front assy 132
........3.3.3 Board-BBB 133
........3.3.4 Lever paper end, Lever paper near end 134
........3.3.5 Motor 135
........3.3.6 Connector (IMSA-9714N-14B), Connector
(IMSA-9714N-14A) 136
........3.3.7 Frange pulley, pulley Idle, Mini pitch belt, Plate Earth
shaft, Gear double, Tray switch assy 137
........3.3.8 Roller feed 138
........3.3.9 Bracket sub roller 139
........3.3.10 Frame side (L) assy 140
........3.3.11 Frame side (R) assy 141
4.0 Troubleshooting 142
....4.1 Precautions Prior to the Troubleshooting 143
....4.2 Preparations for the Troubleshooting 144
....4.3 Troubleshooting Method 145
........4.3.1 LCD Status Message List 146
........4.3.2 Troubleshooting Flow 147
5.0 Connection Diagram 148
....5.1 Interconnection Diagram 149
....5.2 PCB Layout 150
6.0 Parts List 151
E Multi-Feeder
1.0 Outline 152
....1.1 Functions 153
....1.2 External View and Component Names 154
2.0 Mechanism Description 155
....2.1 General Mechanism 156
....2.2 Hopper Mechanism 157

Table of Contents Page
3.0 Parts Replacement 158
....3.1 Precautions Concerning Parts Replacement 159
....3.2 Parts Layout 160
....3.3 Parts Replacement Methods 161
........3.3.1 Separator 162
........3.3.2 AOLE-PCB 163
........3.3.3 Square-shaped connector 164
........3.3.4 Hopping Motor 165
........3.3.5 Planet gear 166
........3.3.6 Roller B 167
........3.3.7 Roller A 168
........3.3.8 Mini pitch belt & Feed roller 169
4.0 Troubleshooting 170
....4.1 Precautions Prior to the Troubleshooting 171
....4.2 Preparations for the Troubleshooting 172
....4.3 Troubleshooting Method 173
........4.3.1 LCD Status Message List 174
........4.3.2 Troubleshooting Flow 175
5.0 Connection Diagram 176
....5.1 Interconnection Diagram 177
....5.2 PCB Layout 178
@6.0 Parts List 179

Page: 1
Service Manual - OKIPAGE20
Chapter 0 Introduction
All specifications are subject to change without notice.
PostScript, Adobe and the PostScript logo are trademarks of Adobe Systems Incorporated, registered in
the U.S.A.
*Times, Helvetica and Palatino are trademarks of Linotype AG and/or its subsidiaries.
ITC Avant Garde Gothic, ITC Zapf Chancery, ITC Zapf Dingbats and ITC Bookman are registered
trademarks of International Typeface Corporation.
HP and LaserJet are registered trademarks of Hewlett-Packard Company.
Diablo 630 is a registered trademark of Xerox Corporation.
AppleTalk is a registered trademark of Apple Computer, Inc.
LocalTalk is a trademark of Apple Computer, 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: 2
Service Manual - OKIPAGE20
Chapter 0 Introduction
This Service Handbook describes the field maintenance procedures for the OKIPAGE20/20n and 20DX.
This handbook was written for use by maintenance personnel. Note, however, that the user should refer to
the USER'S MANUAL for operating instructions for the equipment.
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 Manual - OKIPAGE20
Chapter 1 Configuration
The OKIPAGE20 Series printers consist of control and engine blocks as the standard configuration (See
Figure 1-1.)
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 Manual - OKIPAGE20
Chapter 1 Configuration
The printer unit consists of the following hardware components:
Electro-photographic processor

Paper feeder

Controller

Operator panel

Power/sensor board

Figure 1-2 shows the printer unit configuration.
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 Manual - OKIPAGE20
Chapter 1 Configuration
The options below are available for use with the OKIPAGE20 Series Printer. They are sold
separately from the printer unit.
(1) Multi Feeder
(2) Second / Third Paper Feeder
(3) DUPLEX Unit
(4) Flash ROM module (72 pin SIMM, 4MB/8MB)

(5) PostScript ROM module (72pin SIMM)
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 Manual - OKIPAGE20
Chapter 1 Configuration
(1) Type Desktop
(2) External dimensions (excludes
protruding portion) Height 13.0" (331 mm) Width 14.4" (336 mm)
Depth 18.2" (378 mm)
(3) Weight 42 lbs. (19 kg) If Installed Duplex 47 lbs. (21.3 kg)
(4) Developing method
Exposing method Dry electrophotography LED stationary head
(5) Paper used <Type>
Standard paper

- Xerox 4200 (20 lbs.)
Application paper (manual face-up feed)

- Label
- Envelope
- OHP paper (transparency)
<Size>
Standard sizes

- Letter
- Legal
- Legal-13
- Executive
- COM-10
- Monarch
- DL
- C5
- COM-9
- A4
- A5
- B5 (JIS)
- A6 Applicable sizes

- Width: 3.4" to 8.5" (86 to 216 mm)
- Length: 5.5" to 14" (140 to 355.6 mm)
<Thickness>
- Automatic feed: 16 to 28 lbs. (60 to 105 g/m2)
- Manual feed: label, OHP paper (transparency)
Envelope, 16-36 lb.

(6) Printing speed First print: 8 sec.
Continuous printing: 20 sheets/min. [at duplex print: 10
sheet/min.]
Warm-up time: 90 seconds, [at room temperature 77oF
(25o C), and rated voltage (120 VAC)]
(7) Paper feeding method Automatic feed or manual feed
(8) Paper delivery method Face down/face up
(9) Resolution 600 x 600 dots/inch
600 x 1200 dots/inch
(10) Power input 120 VAC + 5.5%, -15% (ODA)
230V + 10%
(11) Power consumption Peak: Approx. 820W
Typical: Approx. 350W
Idle: Approx. 95W
Power save mode: Approx. 25W
(12) Temperature and humidity
In operation Power off mode During Storage Unit
Temperature 50-90
(10-32) 32-110 (0-43) 14-110 (-10-43)
oF
(oC)
Humidity 2-80 10-90 10-90 %RH
Maximum wet bulb
temperature 77 (25) 80.4 (26.8) -------------- oF
(oC)
Minimum
difference between
wet and dry bulb
temperature
35.6
(2) 35.6 (2) ________ oF
(oC)
Notes:
1. Storage conditions specified above apply to printers in packed condition.
2. Temperature and humidity must be in the range where no condensation occurs.
(13) Noise During operation: 50 dBA or less (without second tray)
55 dBA or less (with second tray)
At standby: 45 dBA or less
Power save mode: 43 dBA or less
(14) Consumables Toner cartridge kit 5,000 (5% duty)*
Image drum cartridge 30,000 at continuous printing*
19,000 (3 page/job) (Simplex printing)*
*Simplex printing without Power Save.
10,000 (1 page/job)

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 Manual - OKIPAGE20
Chapter 1 Configuration
1.5.1 Certification label
1.5.2 Warning label
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 Manual - OKIPAGE20
Chapter 1 Configuration
The safety certification label is affixed to the printer in the position below.
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 Manual - OKIPAGE20
Chapter 1 Configuration
he warning label is affixed to the portion which may cause an injury to human body. Follow the instructions
on warning labels during maintenance.
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 Manual - OKIPAGE20
Chapter 2 Operation Description
The OKIPAGE20 Series Printers consist of a main control board, a power supply unit (120V/230V), a
power supply unit (high voltage), an operator panel and an electro-photographic process mechanism.
The control board receives data through a host I/F, decodes and edits the data, and stores the edited data
in a memory. After completing edition of one page of data, it references the font memory and generates bit
data on the same memory. At the same time, it transfers the bit image data to an LED head in units of one
dot line.
The electro-photographic process mechanism prints data on paper.
The operator panel is used for operations and status display.
Fig. 2-1 shows an OKIPAGE20 Series Printer block diagram.
Figure 2-1 OKIPAGE 20 Series Printer block diagram