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Service Guide OF1000
Chapter 0 About This Manual
OKIFAX 1000
Facsimile Product
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 OF1000
0 About This Manual Front Cover Manual Copyright 1 Product Specifications 1.1.01 General Information 1.2 General Facsimile Specifications 1.3 Communications 1.4 Printer Specifications 1.5 User Functions 1.6 Scanner Specifications 1.7 Consumable Items 1.8 Options 1.9 Agency Approvals 1.10 Reliability Data 2 Principles of Operation 2.1 Principles Of Operation ....2.1.01 Compatibility ....2.1.02 Communications Mode ....2.1.03 Modem Operation ....2.1.04 Automatic Fall-Back Mode ....2.1.05 Telephone Line Connection ....2.1.06 Error Correction Mode (ECM) ....2.1.07 Major Assemblies ........Okifax 1000 Cross-Sectional View ........Copy Function Block Diagram ........Report Print Function Block Diagram 2.2 Transmitter Theory Of Operation - Typical Transmission ....300 bps Transmit Handshake Operation Diagram ....300 bps Receive Handshake Procedure Diagram ....G3 Transmit Functional Block Diagram ....2.2.02 Operator Panel ....2.2.03 Automatic Document Feeder (ADF) ....2.2.04 Scanner Assembly ....2.2.05 Encoder ....2.2.06 Modem ....2.2.07 Network Control Board (NCU) ....2.2.08 Line Board 2.3 Receiver Theory Of Operation ....G3 Receive Operation Block Diagram 2.4 LED Printer - Principal Components ....2.4.02 Printer Control Board (PCNT-150) ....2.4.03 Power Supply Board (PWU-150) 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 39
Table of Contents ........Power Supply Block Diagram ....2.4.04 Sub-Power Supply Board (PSUB-150) ........Sub-Power Supply Board Block Diagram ....2.4.05 Fuser Unit ....2.4.06 Main Motor (Drum Motor) ....2.4.07 LED Array ....2.4.08 DC Fan ....2.4.09 Registration Motor 2.5 Printing Process - General Information ........Printing Process Diagram ....2.5.02 Hopping ....2.5.03 Feeding ....2.5.04 Charging ....2.5.05 Exposing ....2.5.06 Developing ....2.5.07 Transfer ....2.5.08 Fusing ....2.5.09 Cleaning ....2.5.10 Printing 2.6 Sensors And Switches ....Sensor Location Diagram (Top View) ........Detail of Sensor / Lever ........Paper Inlet Jam ........Paper Feed Jam ....2.6.02 Toner Low Sensor 3 Maintenance & Disassembly 3.1 Maintenance - General Information 3.2 Disassembly/Assembly Procedures ....3.2.01 Preliminary Items ....3.2.02 LED Head ....3.2.03 Terminal Cover Cap, Rear Cover, and Fan ....3.2.04 Line Board (LINE-JU) ....3.2.05 Package Shelf Assembly ....3.2.06 Network Control Unit (NCU-U) ....3.2.07 Main Control Board (MCNT-150) ....3.2.08 Printer Control Board (PCNT-150) ....3.2.09 Left Side Cover ....3.2.10 Hook Switch Board (Hook-SW) ....3.2.11 Power Supply Unit (PWU) ....3.2.12 Gear Frame Assembly ....3.2.13 Transmit Stepper Motor ....3.2.14 Gear Frame and Gears ....3.2.15 Memory Card (Option) ....3.2.16 Right Side Cover
Page 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 82
Table of Contents ....3.2.17 Document Guide Assembly ....3.2.18 Speaker ....3.2.19 Separation Rubber Assembly ....3.2.20 Control Panel Assembly ....3.2.21 Upper Paper Guide Assembly ....3.2.22 Upper Feed Roller Assembly ....3.2.23 Pinch Roller ....3.2.24 Sub Pinch Roller Guide Assembly ....3.2.25 Paper Table Guide ....3.2.26 Sensor Roller Assembly ....3.2.27 Sub Roller Assembly ....3.2.28 ADF Roller Assembly ....3.2.29 Pinch Roller ....3.2.30 Document Detect Assembly (PC1) ....3.2.31 Read Station Sensor Assembly (PC2) ....3.2.32 Exit Guide ....3.2.33 Lower Feed Roller Assembly ....3.2.34 Image Sensor Assembly ....3.2.35 ADF Idle Gear ....3.2.36 Scanner Frame Assembly ....3.2.37 Release Guide Assembly ....3.2.38 Second Tray Interface Board ....3.2.39 Registration and Main Stepper Motors ....3.2.40 Eject Roller Assembly ....3.2.41 Manual Feed Guide Assembly ....3.2.42 Face-Down Stacker Cover Assembly ....3.2.43 Fuser Unit Assembly ....3.2.44 Lower Base Assembly ....3.2.45 Reduction and Stepper Motor Idle Gears ....3.2.46 Reset Levers and Pressure Roller ....3.2.47 Transfer Roller ....3.2.48 Registration Roller ....3.2.49 Hopping Roller Assembly ....3.2.50 Inlet Sensor Plates ....3.2.51 Outlet Sensor Plate ....3.2.52 Toner Sensor Plate ....3.2.53 Contact Assembly and Sub-Power Supply Board (PSUB) ....3.2.54 Left and Right Cassette Guides and Base Assembly ....3.2.55 Paper Supply and Cassette Sensor Plates 3.3 Adjustments And Service Settings ........LED Intensity Rating / Dip Switch Settings Table 3.4 Cleaning 3.5 Lubrication
Page 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125
Table of Contents 4 Failure & Repair Analysis 4.1 Failure & Repair Analysis - Introduction 4.2 Troubleshooting Updates 4.3 Reporting Problems 4.4 Troubleshooting Tips 4.5 Repair Analysis Procedures ....4.5.02 RAP Index ........RAP 01: No LCD Display ........RAP 02: Alarm LED is Lit ........RAP 03: Local Copy Problem ........RAP 04: Auto-Dial Problem ........RAP 05: Data Transmission Problem ........RAP 06: Auto Reception Problem ........RAP 07: Reception Problem ........RAP 08: Self-Diagnosis Failure ........RAP 09: Scan Operation Test Failure ........RAP 10: LED Test Failure ........RAP 11: Tone Test Failure ........RAP 12: High-Speed Modem Test Failure ........RAP 13: Multi-Frequency Tone Test Failure ........RAP 14: Printer Unit Print Test Failure ........RAP 15: Voice Message Test Failure ........RAP 16: No Acoustic Line Monitor ........RAP 17: Document Does Not Feed ........RAP 18: Multiple Documents Feed ........RAP 19: Document Skews ........RAP 20: Document Jams ........RAP 21: Printer Unit Problems Shown On LCD Display ............RAP 21A: Cover Open ............RAP 21B: Printer Alarm 1 ............RAP 21C: Printer Alarm 2 ............RAP 21D: Printer Alarm 3 ............RAP 21E: Printer Alarm 4 ............RAP 21F: Paper Jam - Confirm and Stop ............RAP 21G: No Paper ........RAP 22: Image Problems ............RAP 22A: Poor Print Quality (Images Light or Blurred as a Whole) ............RAP 22B: Dark Background Density ............RAP 22C: Printed Output is Blank ............RAP 22D: Vertical Black Stripes on Printed Output ............RAP 22E: Repetitive Spaced Marks on Printed Output ............RAP 22F: Vertical White Streaks on Printed Output ............RAP 22G: Areas Missing From Printed Output
Page 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167
Table of Contents ............RAP 22H: Poor Fusing 4.6 Local Diagnostic Testing ....4.6.01 Self-Diagnosis ....4.6.02 Scan Operation Test / CIS Calibration ....4.6.03 LED Test ....4.6.04 Tone Test ....4.6.05 High-Speed Modem Transmit Test ....4.6.06 High-Speed Modem Receive Test ....4.6.07 Multi-Frequency Tone Test ....4.6.08 Printer Unit Print Test ....4.6.09 Voice Message Test 4.7 Reports - Activity Report ....Service Codes List ....4.7.02 Protocol Dump ........Sample Analysis of Protocol Dump Data ........Facsimile Control Field Conversion Table 4.8 Resets ....4.8.01 Toner Counter Reset ....4.8.02 Drum Counter Reset ....4.8.03 Fuser Counter Reset 4.9 Clearing The Random Access Memory (RAM) ....4.10 Accessing the Technical Function Settings ........Technical Function (TF) Listing ....4.11 Telephone Answering Device (TAD) Interface A Reference Charts General Information A.2 Index To Charts ....A.2.01 Main Control Board (MCNT-150) ....A.2.02 Printer Control Board (PCNT-150) ....A.2.03 Power Supply Board (PWU-150) ....A.2.04 Network Control Unit (NCU-U) ....A.2.05 Line Board (LINE-JU) ....A.2.06 Hook Switch (HOOK -150) ....A.2.07 Operator Panel Board (OPE-150) ....A.2.08 Sub-Power Supply Board (PSUB- 150) ....A.2.09 Second Tray Interface Board B Illustrated Parts Listing General Information & Parts Overview Diagram ....B.1.02 Definition of Terms ....B.1.03 Parts Ordering Information B.2 CHARTS ....B.2.01 Cabinet Assembly (1 of 2) ....B.2.02 Cabinet Assembly (2 of 2) ....B.2.03 Control Panel Assembly
Page 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209
Table of Contents ....B.2.04 Printer Assembly (1 of 3) ....B.2.05 Printer Assembly (2 of 3) ....B.2.06 Printer Assembly (3 of 3) ....B.2.07 Base Assembly (1 of 2) ....B.2.08 Base Assembly (2 of 2) ....B.2.09 Scan Assembly (1 of 2) ....B.2.10 Scan Assembly (2 of 2) ....B.2.11 Scan Unit (1 of 3) ....B.2.12 Scan Unit (2 of 3) ....B.2.13 Scan Unit (3 of 3) ....B.2.14 Upper Paper Guide Assembly (1 of 2) ....B.2.15 Upper Paper Guide Assembly (2 of 2) ....B.2.16 Cables (1 of 2) ....B.2.17 Cables (2 of 2) ....B.2.18 Options ....B.2.19 Packaging ....B.2.20 Consumables ....B.2.21 Documentation
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Service Guide OF1000
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 its control. © 1994 by Okidata All rights reserved. P/N 59261201 P/N 59261202 First Edition August, 1993 First Edition July, 1994
Written and produced by the Okidata Technical Training Group Please address any comments on this publication to: Okidata Technical Training Group 532 Fellowship Road Mount Laurel, NJ 08054-3499 Facsimile 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. OKIFAX® is a registered trademark of Oki Electric Industry Company, Ltd. Touch-Tone® is a registered trademark of American Telephone and Telegraph
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 OF1000
Chapter 1 Product Specifications
1.1.01 General Information The Okifax 1000 is a Group 3 facsimile unit which utilizes an LED page printer engine to produce a plain paper, permanent copy of received data. The unit can store 85 auto dial locations and has 15 one touch programmable keys. Scanning is accomplished by the direct contact image sensor method. The image sensor consists of 1,728 elements. The Okifax 1000 has a scanning width of up to 8.5 inches. 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 OF1000
Chapter 1 Product Specifications
1.2 GENERAL FACSIMILE SPECIFICATIONS 1.2.01 Style · Desktop 1.2.02 Compatibility · CCITT Group 3 ONLY 1.2.03 Physical Dimensions · Width 16.1 inches ( Approximately 410 mm) · Depth 16.4 inches (Approximately 417 mm ) · Height 8.38 inches (Approximately 212.8 mm) · Weight 26.5 pounds (Approximately 12 kg) 1.2.04 Ambient Temperature and Relative Humidity (RH) · Operation 50° to 90° F 10° to 30° C 20 to 80% RH · Storage -20° to 43° C -4° to 109° F Temperature Conversion Formulas F° to C°: C°= (F°-32) * .5556 C° to F°: F°= (C°* 1.8) +32 1.2.05 Power Requirement · 115 vac 1.2.06 Power Consumption Mode Transmit Receive Local Copy (All black) Local Copy Standby
Typical Power 40W 120W 118W (580W**) 125W 35W
** Peak Power when the input voltage is 120V.
1.2.07 LCD Display · 2-line by 20 digit display 1.2.08 Memory · Standard Memory 256 Kbytes (up to 14 pages of CCITT No.1 Sample Document) · Optional Expansion Memory 1 Mbyte (up to 64 pages of CCITT No.1 Sample Document) 1.2.09 Copy Mode Resolution · Fixed at 200 lines per inch 1.2.10 Warm-up Time · From power On until printer is ready Maximum of 120 seconds 1.2.11 Receive Options · Auto Receive · Manual Receive · Tel/Fax Receive · Telephone Answering Device (TAD) Mode · No Paper Receive · No Toner Receive 1.2.12 Transmit Document Specifications · Document Width Minimum 5.8 inches Maximum 8.5 inches · Document Length Minimum 5 inches (single page), 5.8 inches (multi-page document) Maximum 14 inches, or unlimited length for 1 hour · Document Weight Range 16 pounds to 24 pounds · Desired opacity Less than 40 % of the scanner source light should be able to pass through the paper. 1.2.13 Automatic Document Feeder (ADF) Capacity · 30 sheets (20 pound bond) 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 OF1000
Chapter 1 Product Specifications
1.3 COMMUNICATIONS 1.3.01 Telephone Line Compatibility · PSTN (public switched telephone network) · PBX (private branch exchange) 1.3.02 Communication Mode · Half Duplex 1.3.03 Protocol · CCITT Recommendation T.30 · Oki Special Protocol In multi-document reception, the local unit can start transmitting the modem training bits immediately after transmitting end of message (EOM) and upon reception of message confirmation (MCF) from the remote unit, instead of repeating all procedures (which takes about six seconds). · Oki Special High Speed The T.30 handshake is conducted at message transmission speed (instead of 300 bps) during multi-page transmission. 1.3.04 Line Interface · Impedance 600 ohms balanced · Send Power Level 0 dbm to -15 dbm (can be adjusted in 1 dbm steps by modifying TF #21) 1.3.05 Ring Signal Detection Sensitivity · Voltage Range 25 to 150 r.m.s. · Frequency Range 15 to 68 Hz (with 44 to 56 volts superimposed) · Ring Signal Detection Time One Ring Signal or Adjustable between 5 and 30 seconds, in 5 second increments Refer to User Function 24 (optional second tray installed) Refer to User Function 23 (optional second tray NOT installed) · Ring Signal Voltage Duration Longer than 180 milliseconds (inoperative if duration is 90 milliseconds or less) 1.3.06 Coding Schemes · Modified Huffman (MH) Only · Modified-Modified Read (MMR) · Modified Huffman (MH)
1.3.07 Error Correction Methods · CCITT Error Correction Mode (ECM) · Page Re-transmission (Memory Mode / ECM Off) 1.3.08 High Speed Modem · CCITT Recommendation V.29 (9600/7200 bps) · CCITT Recommendation V.27 Ter. (4800/2400 bps) 1.3.09 Low Speed Modem · CCITT Recommendation V.21 Channel 2 (300 bps) 1.3.10 Transmission Time · 10 seconds CCITT No. 1 sample document at 9600 bps 1.3.11 Transmit Resolution · Horizontal 8 PELs per mm (PEL = Picture ELement) · Vertical STD 3.85 lines per mm or 98 lines per inch FINE 7.7 lines per mm or 196 lines per inch Ex.FINE 15.4 lines per mm or 392 lines per inch 1.3.12 Photo/Half Tone Transmit Resolution · 32 Levels (using error diffusion) 1.3.13 Ringer Equivalent Number · 0.68 1.3.14 Transmit Dialing Methods · Auto Dialing 70 two-digit auto dial codes · One Touch Dialing 15 one-touch keys) · Off Hook Dialing · On Hook Dialing · Broadcasting Group Dial 1.3.15 Receive Mode · Auto Receive Dedicated fax machine · Manual Receive Telephone manual switch to fax mode · Tel\Fax Auto Switching Telephone will auto switch to fax mode · TAD Interface
1.3.16 Broadcast Transmit Capabilities · Maximum: 85 locations in one session 1.3.17 TSI/CSI · Maximum: 20 characters are displayed. If the function is enabled, the received TSI is marked at the top of the first reproduced copy. NOTE: FEDERAL COMMUNICATIONS COMMISSION TELEPHONE CONSUMER PROTECTION ACT Part 68 Implementation of the Telephone Consumer Protection Act states: " The Telephone Consumer Protection Act of 1991 makes it unlawful for any person to use a computer or other electronic device to send any message via a telephone fax machine unless such message clearly contains in a margin at the top or the bottom of each transmitted page, or on the first page of the transmission, the date and time it is sent and an identification of the business, other entity, or individual sending the message and the telephone number of the sending machine of such business, other entity or individual." To comply with this law, the End-User must: 1. Enter the DATE and TIME into the Okifax 1000 2. Enter the NAME and TELEPHONE NUMBER to identify the source of their facsimile transmission. 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 OF1000
Chapter 1 Product Specifications
1.4 PRINTER SPECIFICATIONS 1.4.01 Print Method · Development Dry electro-photography · Exposure Stationary LED head 1.4.02 Print Speed · Continuous Print 4 sheets per minute (letter size) · Warm-up Time Power-ON (Cold): approximately 120 seconds Idle: approximately 15 seconds 1.4.03 Receive Paper Sizes · Letter 8.5 inches x 11.0 inches · Legal (Option) 8.5 inches x 14.0 inches 1.4.04 Receive Paper Types · 20 pound Bond Paper 1.4.05 Copy Stacking · The Okifax 1000 stacks the printed output printed side down. Face-down Stacker Capacity: 100 sheets 1.4.06 Paper Cassette Capacity · First Cassette 100 sheets · Second Cassette (Option) 250 sheets 1.4.07 One-Line Minimum Print Time · Standard Resolution 10 milliseconds per line · Fine Resolution 5 milliseconds per line 1.4.08 Contrast Selection · Normal · Light · Dark
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 OF1000
Chapter 1 Product Specifications
1.5 USER FUNCTIONS 1.5.0l Transmit Mode · Auto transmit mode The Okifax 1000 begins sending messages after detecting the remote stations answer. · Manual transmit mode The operator presses the Start Key after an answer tone has been heard. 1.5.02 Receive Mode · Auto Receive Mode · Manual Receive Mode · Telephone / Fax Automatic Switch · TAD Interface 1.5.03 Absent Mode Auto Timer · This feature enables switching to the auto receive mode at a specified time. 1.5.04 Group Dial · One group of up to 85 locations 1.5.05 Telephone Directory and Location ID · In addition to telephone numbers, an alphanumeric name can be assigned to each of the numbers. This alphanumeric name is called the Location ID and can contain up to 15 characters. 1.5.06 Voice Request · A voice request from the transmitter is available only upon completion of the total message transmission.
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 OF1000
Chapter 1 Product Specifications
1.6 SCANNER SPECIFICATIONS 1.6.01 Scanning Method · 1728 bit contact image sensor 1.6.02 Effective Reading Width · Maximum: 8.5 inches 1.6.03 Scanning Resolution · Horizontal 8 PELs per mm (PEL= Picture ELement) - approximately 200 PELs per inch · Vertical 3.85 lines per mm or 98 lines per inch (STD) 7.7 lines per mm or 196 lines per inch (FINE) 15.4 lines per mm or 392 lines per inch (Ex.FINE) 1.6.04 Automatic Document Feeder · Maximum 30 sheets of 8.5 x 11 inch, 20 pounds bond paper NOTE: Documents must be placed face down on the ADF document guide. 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 OF1000
Chapter 1 Product Specifications
1.7 CONSUMABLE ITEMS 1.7.01 Toner Cartridge Kit · Toner Cartridge · LED Lens Cleaner Pad 1.7.02 Image Drum Cartridge Kit · Image drum
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 OF1000
Chapter 1 Product Specifications
1.8 OPTIONS 1.8.01 Letter / Legal / Universal Paper Tray · 100 sheet capacity · Adjustable sizing capability (letter, legal, universal) 1.8.02 Second Tray Unit (ST-250) · 250 sheet capacity 1.8.03 Memory Expansion Kit · 1 MByte Memory Card 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 OF1000
Chapter 1 Product Specifications
1.9 AGENCY APPROVALS · FCC Class A · UL 478 Ver. 5 · CSA 22.2 220 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 OF1000
Chapter 1 Product Specifications
1.10 RELIABILITY DATA 1.10.01 Automatic Document Feeder Jam Rate · Approximately one for every 500 operations 1.10.02 Separation Rubber Life · Approximately 10,000 document feeds 1.10.03 Lithium Battery Life · Approximately 5 years 1.10.04 Image Drum Life · One page print jobs Up to 11,000 pages · Continuous print Up to 20,000 pages 1.10.05 Toner Cartridge Life · First toner cartridge in image drum Up to 1,250 pages · Subsequent toner cartridges Up to 2,500 pages 1.10.06 Estimated Fuser Life · Approximately 180,000 pages 1.10.07 Facsimile Mean Time Between Failure (MTBF) · Approximately 3,000 hours 1.10.08 Printer Duty Cycle · Approximately 6,000 pages per month 1.10.09 Estimated Printer Life · Approximately 180,000 pages 1.10.10 Mean Time To Repair (MTTR) · Approximately 30 minutes 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 OF1000
Chapter 2 Principles of Operation
2.1 PRINCIPLES OF OPERATION The Okifax 1000 Principles of Operation section is comprised of three sub-sections. · Transmitter Theory of Operation · Receiver Theory of Operation · LED Printer Theory 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)
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Service Guide OF1000
Chapter 2 Principles of Operation
2.1.01 Compatibility The Okifax 1000 facsimile machine operates as a Group 3 (G3) facsimile device. 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 OF1000
Chapter 2 Principles of Operation
2.1.02 Communications Mode The Okifax 1000 operates as a half-duplex facsimile transceiver. Transmit and receive operations cannot take place at the same time. However, documents can be prepared for transmission while the Okifax 1000 is engaged in message reception. These documents will be automatically transmitted upon completion of the receiving 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)
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Service Guide OF1000
Chapter 2 Principles of Operation
2.1.03 Modem Operation The high-speed modem conforms to CCITT Standard V.29 for 9600/7200 bps (bits per second) operation and to CCITT Standard V.27 ter. for 4800/2400 bps operation. The low-speed (300 bps) modem, which is used for handshaking, conforms to CCITT standard V.21 channel 2 or equivalent. 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 OF1000
Chapter 2 Principles of Operation
2.1.04 Automatic Fall-back Mode The Okifax 1000 will change the message transmitting speed according to the following fall-back plan. The Okifax 1000 will first transmit a page of the message at 9600 bps. The receiving station will continuously monitor the received data. If the receiving station detects six or more consecutive error lines during reception of a single page, or if the total number of errors detected during the reception of a single page exceeds 10% of the data on the transmitted page, it will return an RTN (Retrain Negative) signal to the transmitting station upon termination of the page reception. With an RTN signal received, the transmitting station will downgrade its speed by one level (to 7200 bps in this case) and continue transmission of the next page. Similarly, should the transmitting station again receive an RTN signal from the receiving station, it will downgrade speed another level. 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 OF1000
Chapter 2 Principles of Operation
2.1.05 Telephone Line Connection The Okifax 1000 is connected to the telephone line via the LINE-JU Board. Two RJ-11 connectors are provided; one for connection to the phone line, and the other for an external telephone. A separate modular jack is provided for connection of the Okifax 1000s handset. The Okifax 1000 will control the switching between the handset (or the external telephone) and the telephone line to permit use of the handset or telephone for voice communication. 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 OF1000
Chapter 2 Principles of Operation
2.1.06 Error Correction Mode (ECM) The Okifax 1000 features Error Correction Mode (ECM). When communicating with a remote unit that also has ECM, this feature provides error-free transmission. What follows is an explanation of how ECM works. · The transmit machine groups image data into blocks and transmits one block of data at a time to the receive machine. At the end of each block, a PPS (Partial Page Signal) is transmitted. · The receive machine stores the data block in memory and checks each frame within that block for errors. - Modified Huffman assigns a binary code to consecutive recurring bits of white or black. The codes must add up to a total of 1728 bits, which is the Main Scan Rate established by CCITT. - Modified Read uses a comparison technique. The line being coded is compared to the previous line and differences are noted. Codes are then assigned to reflect the differences between the two lines. · If no errors are detected, the receiver sends MCF (Message Confirmation) which requests the transmit machine to transmit the next data block. · If an error is detected by the receive machine, it transmits the frame number of the defective frame back to the transmit machine in a signal called PPR (Partial Page Request). · The transmit machine will then re-transmit the frame to the receive machine as a Partial Page. · The receive machine rechecks the Partial Page, and (if all frames are correct) the receive machine transmits MCF (Message Confirmation). · The next data block is then transmitted. 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 OF1000
Chapter 2 Principles of Operation
2.1.07 Major Assemblies The following major assemblies make up the Okifax 1000 facsimile machine. · Main Control Board MCNT-150 · Printer Interface Board PCNT-150 · Network Control Unit Board NCU-U · Operation Panel Assembly OPE-150 · Power Supply Board (FXLA) PWU-150 · Sub-Power Supply Board (FXHA) PSUB-150 · Line Board LINE-JU · Hook Switch Board HOOK SW · Printer Unit · Scan Unit 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 OF1000
Chapter 2 Principles of Operation
Okifax 1000 Cross-Sectional View
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 OF1000
Chapter 2 Principles of Operation
Copy Function Block Diagram
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 OF1000
Chapter 2 Principles of Operation
Report Print Function Block Diagram
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 TRANSMITTER THEORY OF OPERATION 2.2.01 Typical Transmission When a telephone number is dialed through the Okifax 1000 (either manually or through auto-dial), a connection will be established with the receiving station through the Public Switched Telephone Network (PSTN). When the call is answered, the operator will hear the Called Equipment Device (CED) tone from the receiving station. With CED received, the transmit machine acknowledges that the connection is established and proceeds to the CCITT T.30 300 bps handshake procedure. NOTE: Refer to the Receive and Transmit overviews of 300 bps handshaking.
Handshake Procedure Block Diagrams for functional
Refer to the Transmit Block Diagram for an overview of G3 Transmit Operations. When the DIS (Digital Identification Signal) is received, G3 mode transmission is possible and the Okifax 1000 starts scanning the document, page by page. The image data is temporarily stored in FIFO (First In First Out) memory until it becomes valid for transmission. In about 3 seconds, the machine will receive CSI (Called Subscriber Identification) from the distant station. After reading the document pages and storing the image data in memory, the machine begins the handshake with the distant station. If the 9600 bps training is successfully completed, the machine will start transmitting the image data in digital, coded form. Training is a high speed data pattern transmitted to the receive modem. This training data pattern causes the receive modem to synchronize with the transmit modem. If the training fails due to the line condition, an automatic fallback to a lower rate will occur. The result will be indicated on the LCD display. As the machine transmits each page of image data, the page count on the LCD display will increment. Training is used : · To test the line condition for valid transmissions at a particular data rate. The TCF consists of 100 binary 0s transmitted in a burst. At least 98% accuracy must be achieved before transmission can take place at that data rate. · By the receiving station in setting preliminary equalization for the current line conditions.
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300 bps Transmit Handshake Operation Diagram
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300 bps Receive Handshake Procedure Diagram
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G3 Transmit Functional Block Diagram
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2.2.02 Operator Panel Through the operator panel (OPE-150), the end user initiates transmit and receive operations, sets desired options, programs telephone numbers and other data, and interfaces in all facets of the operation of the machine. The panel consists of an LCD display (two rows of 20 characters), a numeric key pad, 8 LED indicators, and function keys. The functions of the keys and indicators are described in the Okifax 1000 Users Documentation. 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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2.2.03 Automatic Document Feeder (ADF) The automatic document feeder transfers document sheets to the scan unit automatically, one at a time. The following diagram shows the mechanism used for detecting the leading and trailing edges of a document. When a document is placed on the feeder, it is sensed by PC1. This causes the feed rollers to activate, feeding the document. The document is fed to the PC2 lever, where the leading edge of the document is detected. When transmit (or copy) begins, the document is fed by the transmit stepper motor to the start scan position where reading start. The documents trailing edge is detected when the PC2 lever is released. If another document is on the feeder, the process is repeated. The separation rubber holds back the top originals and allows only one document to be fed into the scanner area. The separation rubber and ADF rollers should be cleaned or replaced according to the cleaning schedule (in Section 3 of this manual) to assure proper operation. The ADF capacity is 30 pages of 20 lb. bond. Documents are placed on the feeder image face side down. When feeding multiple pages, the bottom page is fed first, working toward the top. Document Leading/Trailing Edge Detection Diagram
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2.2.04 Scanner Assembly The Okifax 1000 uses a 1728-element direct contact type image scanning sensor. LEDs are located at the bottom of the scan glass and image sensors are located at the top of the glass. When the document reaches the scanning unit, it passes directly in front of the image sensor. The LEDs illuminate the document and the light reflects back to the image sensors. This image data is sent to the printer control board (PCNT-150). The transmitted document length is limited to 14 inches; however, the machine can be modified for longer transmissions. (See Transmitting Long Documents in the Users Documentation). Transmission will stop and a line disconnect will occur if the end of the document is not detected within 14 inches after scanning begins (unless the unit is set for unlimited transmission.) The message RE-LOAD DOCUMENT CONFIRM AND "STOP" will be displayed if the document does not reach the scanning position within 5 seconds after the start of a document feed. NOTE: When a jam condition is displayed on the operator panel during message transmission, the machine will stop, but its receiving capability will remain active. 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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2.2.05 Encoder Scanned image data received by the PCNT is sent to the encoder/decoder (ENC/DEC) on the MCNT-150 board. The image data is compressed by the ENC/DEC according to the Modified Huffman (MH) and Modified Read (MR) encoding scheme, or MH only. The use of MH only or both MH and MR is determined by a function setting. Data is then stored in the FIFO area in one byte units. Fill bits are inserted if the length of one encoded line is less than the minimum scan time of the remote unit. Data is transferred to the NCU board, then sent to the line board for transmission over the phone line. 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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2.2.06 Modem The modem, located on the MCNT-150 board, modulates the data in the correct G3 (9.6, 7.2, 4.8, or 2.4K bps) data rate that was determined during handshaking between the local machine and the remote receiver. Modulation is the process of converting the digital output of the scanner into an analog signal that can be transmitted over the telephone system. 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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2.2.07 Network Control Board (NCU) The NCU-U board receives the modulated data from the MCNT-150 board and transfers the data to the line board. The NCU board performs the following functions during the transmit operation. · Unit connection / disconnection to the telephone line via the CML Relay · Dial pulse generation · The PIS Tone detection · Off-Hook Detection (Line Current Detector) · Tx Output Signal Attenuation (normally 9 db output) · Separation of the TX and RX signals (performed by the Hybrid Transformer) · Impedance matching (the 600 ohm impedance of the telephone line) 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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2.2.08 Line Board The line board provides the RJ-11 connection used to transmit data to the PSTN or PBX.
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2.3 RECEIVER THEORY OF OPERATION NOTE: Refer to the G3 Receive Operation Block Diagram
.
2.3.01 Operator Panel Through the operator panel, the user initiates manual receive operations and sets auto-answer options. 2.3.02 Line Board The line board provides the RJ-11 connection used to receive data from the PSTN or PBX. 2.3.03 Network Control Board (NCU) The NCU receives the modulated data from the line board and sends it to the modem (located on the MCNT board). The operation of the NCU in the receive mode is very similar to the transmit mode. However, during receive operations, the NCU also functions as an amplifier for the received signal. 2.3.04 Modem The modem demodulates the data from the G3 (9.6, 7.2, 4.8, or 2.4K bps) scheme that was determined during handshaking. The data is then sent to the read-only memory for temporary storage. The storage time is dependent on whether the machine is printing real-time or from memory. 2.3.05 Decoder The decoder decodes the MH, MR, or MMR data from the RAM into lines of picture data that are 1,728 bits in length. After the data has been received, demodulated, and decoded, it is transferred to the PCNT board. 2.3.06 Document Size Since the available printing area of the printer is smaller than the paper size, document contents may be missed on both sides of the paper, or a document image having the same length as the printing paper may be split into separate pages during printing. To prevent this, the Okifax 1000 automatically sets the proper reduction ratio within the range of 90 to 100% if the RX REDUCTION function has been set ON. If a received document image is longer than the available printing length, the excess part of the image is eliminated. If the SPLIT PRINT function has been set ON, the excess image will be printed on the next page. 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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G3 Receive Operation Block Diagram
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2.4 LED PRINTER 2.4.01 Principal Components The principal hardware components of the printer unit are listed below. · Printer Control Board (PCNT-150) · Power Supply Board (PWU-150) · Sub-Power Board (PSUB-150) · Fuser Unit · Main Motor · LED Head · Registration Motor · DC Fan · Second Paper Tray Mechanism (option) 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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2.4.02 Printer Control Board (PCNT-150) The printer control board (PCNT-150) contains a microprocessor, an EPROM which stores the printer control program, and 640 Kbytes of dynamic RAM. This board controls the paper feed and paper transport functions. This board also activates the LED array diodes, which leave a latent electrostatic image on the photosensitive drum. This latent image is printed by fusing toner to the paper. 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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2.4.03 Power Supply Board (PWU-150) The power supply is a switching-type unit, which generates the following voltages from the AC input voltage. · + 5 vdc : Printer Logic · + / - 12 vdc: Interface Signal Levels · + 38 vdc: Transmit Stepper Motor, Registration / Drum Motor Drive, Fan Drive, high-voltage source. When the PCNT-150 board enables the HEATON signal, the power supply provides the AC voltage to the fuser lamp via the PSUB-150 board. 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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Power Supply Block Diagram
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2.4.04 Sub-Power Supply Board (PSUB-150) The PSUB-150 consists of IC1 (a one-chip CPU), a cover-open switch, the high voltage generation circuit and the photo-sensors. Photosensors · PS1 - Outlet Sensor - Detects paper jams at the paper exit path. · PS2 - Paper Sensor - Along with the outlet sensor, is used to monitor paper feed and paper length. · PS3 - Inlet Sensor 1 - Detects the leading edge of the paper. Used in the determination of when to switch from the hopping to feeding operation. · PS4 - Paper-end Sensor - Detects the presence of paper in the cassette. (ON: Paper is present) · PS5 - Inlet Sensor 2 - Detects the width of the receive paper (ON: A4 or larger) · PS6 - Toner-low Sensor - Detects a lack of toner Cover Open Switch Whenever the stacker cover is opened, the cover open switch is turned OFF. This removes the + 38 vdc source voltage from the high-voltage generation circuit. As a result, all high-voltage outputs are disabled. The CVOPN signal is sent to the MCNT-150 and the cover open routine is performed. The message COVER OPEN will be displayed on the operator panel. High-Voltage Circuits The following voltages are generated for use in the electro-static printing process.
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Sub-Power Supply Board Block Diagram
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2.4.05 Fuser Unit The fuser unit is controlled by a thermistor, the printer interface gate array, an LSI and the CPU to keep the heat roller surface temperature within a predetermined range (about 150 degrees Celsius). A thermal fuse within the fuser unit prevents abnormal temperature rises in case the thermistor fails. NOTE: The CPU checks for an open circuit in the thermistor at power -on, setting a fuser alarm if this error is detected. The CPU also sets a fuser alarm if the proper temperature is not attained within a specified period of time after power-on. Upon detecting a fuser alarm, the CPU will halt (after printing the current page). 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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2.4.06 Main Motor (Drum Motor) The main motor is controlled by the motor control LSI, on the PCNT-150 board. The motor used is a four-phase motor, driven by the two phase excited signal generated by the LSI. 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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2.4.07 LED Array Data for the 1,728 LEDs in the LED array is placed in the shift register by the HD CLK signal. The data is loaded in the latch circuit by the HD LD 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)
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2.4.08 DC Fan The fan is controlled by the FAN ON-P signal from the PCNT-150 board. In order for the facsimiles printer to operate, the signal FAN SENSE-N must be active. NOTE: The fuser and the fan are not enabled when the cover is open. If the fan fails to run, the fuser will turn off and the message PRINTER ALARM 4 will be displayed. Printing is disabled. 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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2.4.09 Registration Motor The registration motor is driven clockwise for initial receive paper loading, then counterclockwise for paper feeding. The motor is controlled by the motor drive IC on the PCNT-150 board. 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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2.5 PRINTING PROCESS 2.5.01 General Information Hopping and feeding are controlled by a single registration motor. Turning the registration motor in the "A" direction drives the hopping roller. Turning the registration motor in the "B" direction drives the registration roller. The registration gear and hopping gear contain one-way bearings. Turning each of these gears in the reverse direction will NOT turn the corresponding roller.
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Printing Process Diagram
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2.5.02 Hopping Hopping loads paper from the paper cassette. During the hopping operation, the registration motor turns in a clockwise direction. This motor drives the hopping roller, which in turn advances the paper until the inlet sensor 1 switches ON. The registration gear turns, but the one-way bearing does not allow the registration roller to turn. After inlet sensor 1 switches ON, the paper is advanced a predetermined length (until the paper reaches the registration roller).
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2.5.03 Feeding Feeding transports paper through the printer. After the completion of hopping, the registration motor turns in a counter-clockwise direction. This counter-clockwise motion drives the registration roller and advances the paper. The hopping gear turns, but the one-way bearing does not allow the hopping roller to turn.
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2.5.04 Charging Charging applies -1.3 Kvdc to the charge roller. The charge roller contacts the image drum surface. The charge roller has two layers: a conductive layer and a surface protective layer. The surface layer is flexible, which assures proper contact with the photosensitive drum. The drum surface charges to approximately -750 vdc.
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2.5.05 Exposing The image drum has four layers. · Carrier Transfer Layer (CTL) · Carrier Generation Layer (CGL) · Underlayer (UL) · Aluminum Base The CTL and CGL make up the organic photo conductor layer (OPC), which is about 20 micrometers (m m) thick. When light from the LED head irradiates the image drum surface, the light energy generates positive and negative carriers in the CGL. The positive carriers are moved to the CTL by an electrical field acting on the image drum. The negative carriers flow into the aluminum layer (ground).
The positive carriers moved to the CTL combine with the negative charges on the image surface
(accumulated by the contact charge of the charge roller), lowering the potential on the image drum surface. The resultant drop in the potential of the irradiated part of the image drum surface forms an electrostatic latent image on it. The surface potential on this irradiated part of the image drum is approximately -100 vdc.
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2.5.06 Developing The electrostatic latent image formed on the image drum surface is developed into a visible image. Developing takes place when contact is made between the image drum and the developing roller. As the toner supply roller rotates, toner is absorbed into the sponge type roller material.
A charged particle will be attracted to a particle having a MORE POSITIVE charge than its own. The developing roller surface is charged to -300 vdc and the toner supply roller is charged to -450 vdc. Since the development roller is charged more positive than the toner supply roller, the toner on the toner supply roller is attracted to the developing roller. The toner on the developing roller contacts the doctor blade, forming a thin coat of toner on the developing roller surface.
The exposed portion of the image drum contains a more positive charge than the development roller (-100 vdc vs -300 vdc). Therefore, toner is attracted to the exposed areas of the image drum, making the electrostatic latent image visible.
NOTE: The toner supply roller and the developing roller are supplied with the bias voltages required during the developing process. The toner supply roller is charged to -450 vdc. The developing roller is charged to -300 vdc. 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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2.5.07 Transfer The transfer roller is made of a conductive sponge material. The roller keeps the paper in constant contact with the image drum. Paper is placed over the image drum surface. A positive charge (opposite in polarity to the toner) is applied to the paper from the reverse side. A charged particle will be attracted to a particle having a MORE POSITIVE charge than its own. A high positive charge is applied to the transfer roller by the power supply board. This induced charge (on the surface of the transfer roller) is transferred to the paper when contact is made between the transfer roller and the paper. The lower side of the paper is positively charged. The negatively charged toner (on the photosensitive drum) is transferred to the upper side of the paper because of the positive charge on the lower side of the paper.
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2.5.08 Fusing After transfer, the toner image is fused to the paper by heat and pressure. The paper passes between the fusing roller and the pressure roller. The fusing roller has a teflon coating and contains a 400 watt halogen lamp. A thermistor (which contacts the fusing roller) maintains the fusing roller temperature at approximately 150 degrees Celsius. A thermostat cuts off the voltage supply to the lamp if there is an abnormal temperature rise. The pressure roller provides 2.5 Kg of pressure. This is generated by the pressure springs at each side of the roller.
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2.5.09 Cleaning The image drum is cleaned at the end of transfer. The residual toner on the image drum is attracted to the cleaning roller, which has a + 400 vdc static charge.
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2.5.10 Printing Refer to the Printing Process Diagram Printing is accomplished as follows. · Approximately - 1.3 Kvdc is supplied to the charge roller. This causes the drum to charge to approximately - 750 vdc. · The LED head is turned ON in accordance with signals from the printer control board. This causes a latent electrostatic image to be formed on the surface of the drum. · Through the development process, a toner image replaces the electrostatic image. · A + 1 Kvdc charge is applied to the transfer roller. This causes the toner image to be transferred to the receive paper. · Heat and pressure cause the toner image to become fused to the receive paper. The 150 degree Centigrade fusing temperature is attained by turning a 400 watt halogen lamp ON. The fusing temperature is controlled by a thermistor. In the event of a thermistor failure, a temperature fuse will OPEN, turning off the quartz lamp, and preventing equipment damage. · The residual toner is removed from the drum. .
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2.6 SENSORS AND SWITCHES 2.6.01 Paper Jam Detection Paper jam detection monitors the location of paper when the printer is powered ON and during printing. If any of the following jams are present, the printing process is interrupted and the message PAPER JAM will be displayed on the LCD. To return to the printing process, the paper jam condition MUST be cleared. This is accomplished by opening the upper cover, clearing the jam, and closing the cover. Paper Outlet Jam This jam occurs if, · The paper does NOT pass over the outlet sensor within a pre-determined period of time, however, the paper has already passed over the paper sensor. Paper Size Error The time interval between when the paper contacts the paper sensor and the outlet sensor determines which size (length) paper is being used. This error occurs if, · The paper size of the loaded paper differs by + 45 mm or more from the paper size set by the menu. Cover Open Switch When the stacker cover is opened, the cover open microswitch on the sub-power supply board (PSUB-150) is deactivated. This disables the + 38 vdc and the high voltage power supply circuit. As a result, all high voltage outputs are interrupted. At the same time, the CVOPN signal is sent to the main control board (MCNT-150) to notify it of the OFF state of the microswitch. The MCNT-150 executes the cover open routine. The operation panel displays the message COVER OPEN.
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Sensor Location Diagram (Top View)
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Detail of Sensor / Lever
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Paper Inlet Jam This jam occurs when either of the following conditions occur. · When the printer is powered ON, paper is at inlet sensor 1. · After the hopping operation is attempted three times, the leading edge of the paper does NOT reach inlet sensor 1.
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Paper Feed Jam This jam occurs when either of the following conditions occur. · The paper does not pass over the paper sensor within a pre-determined period of time. · The leading part of the paper does not reach the outlet sensor within a pre-determined period of time after the paper has passed over the paper sensor.
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2.6.02 Toner Low Sensor The toner well of the image drum cartridge contains a toner agitator. Whenever the image drum rotates, the toner agitator attempts to turn. A spring clip in the bottom of the toner well (along with the proper amount of toner) holds the agitator at the bottom of the well. However, when toner is distributed unevenly or an insufficient amount of toner is in the well, the toner agitator will rotate. Therefore, as long as the toner well contains an adequate supply of evenly distributed toner, the toner agitator will not rotate. The toner sensor lever has a magnet embedded in it. Whenever the toner agitator is positioned at the bottom of the toner well, the toner sensor lever is magnetically attracted to the toner agitator. This causes the toner sensor lever to be lifted from the path of the toner sensor. During a low toner condition (less than 20 grams of toner remaining), the toner agitator will rotate continuously. This causes the toner sensor to turn ON / OFF as the image drum rotates. The operator panel will then display the TONER LOW message. During an unevenly distributed toner condition, the toner agitator will rotate until the toner is distributed sufficiently. This causes the toner sensor to turn ON / OFF for only a few image drum rotations. The operator panel will not display an error message since this is normal printer operation. If the toner sensor remains in an ON condition, the operator panel will display the TONER SNS message.
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Service Guide OF1000
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. Counters may have to be reset and adjustments may be required when either consumables or parts are replaced. Failure to perform these procedures could result in unnecessary service calls. The Okifax 1000 is a xerographic device. 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) · 5.5 mm wrench · Digital multimeter · Shop vacuum with toner filter · Soft, lint-free cloth · All-purpose cleaner · Dow Corning Molycoat BR-2 or Molycoat EM-30L or equivalent 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 AC 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.
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 OF1000
Chapter 3 Maintenance & Disassembly
3.2 DISASSEMBLY/ASSEMBLY PROCEDURES General Information This section contains the disassembly procedures. Only the removal procedures are explained here. Reverse the procedure for the installation. At the bottom of each procedure is a listing of Okidata part numbers, item descriptions, and cross-references to Appendix B. Items included in the Recommended Spare Parts List are designated by the acronym RSPL. N/A will appear where a part number is not available. This Service Handbook lists the disassembly procedures for major components of the unit. 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 ass