OKIDATA OKIOFFICE 44 User manual

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Service Manual
OKIOFFICE 44
59276801

Disclaimer
This document may not be reproduced without the written permission of OKIDATA Training and
Publications. Evert 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.
Copyright / About Information
Copyright 1997 by OKIDATA. All rights reserved.
First Release P/N 59276801 September, 1997
Written by OKIDATA Training and Publications
Contact Information
Please address any comments on this publication to:
Mailing Address OKIDATA
532 Fellowship Road
Mount Laurel, NJ 08054-3499
Web Site www.OKIDATA.com
Telephone [phone]
Facsimile [phone]
OKILINK Login Name Technical Training
Copyright Listing
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.
Faxable Facts is a trademark, All Rights Reserved, 1993
IBM, PC, PC-DOS, and Proprinter XL are registered trademarks of International Business Machines
Corporation.
Microsoft and MS-DOS are registered trademarks and Microsoft Basic, Windows, TrueImage, and
TrueType are trademarks of Microsoft Corporation.
OKILINK II is a trademark of Oki Electric Industry Company, Ltd.
ZIP Code is a registered trademark of the United States Postal Service

Table of Contents TOC - 1 OKIOFFICE 44
Service Manual, P/N 59276801
Contents
Section 1: General Information ............................................................... 1 - 1
1.1 General Performance ........................................................................................................... 1 - 1
1.2 General User's Function ......................................................................................................1 - 4
1.3 General Maintenance Functions ..........................................................................................1 - 7
1.4 General Appearance.............................................................................................................1 - 8
1.5 Basic Performance Specifications .......................................................................................1 - 9
1.6 Reports and Lists ...............................................................................................................1 - 20
Section 2: Installation ..............................................................................2 - 1
2.1 General Setup Information ..................................................................................................2 - 1
2.2 Site Selection .......................................................................................................................2 - 3
2.3 Unpacking............................................................................................................................2 - 4
2.3.1 Unpacking for OKIOFFICE 44 ...............................................................................2 - 4
2.4 Check of Contents ...............................................................................................................2 - 6
2.5 Installation of Attachments ..................................................................................................2 - 7
2.6 AC Cord Connection .........................................................................................................2 - 12
2.7 Telephone and Line Connections ......................................................................................2 - 13
2.8 Packing for Shipment ........................................................................................................2 - 13
2.9 Initial Settings....................................................................................................................2 - 14
2.9.1 General Procedure of Key Operation ....................................................................2 - 14
Key Operation Flowchart ......................................................................................2 - 15
2.9.2 Technical Functions............................................................................................... 2 - 18
Service Personnel Initial Settings Table 2.9.1 (1/7) ..............................................2 - 19
Service Personnel Initial Settings Table 2.9.1 (2/7) ..............................................2 - 20
Service Personnel Initial Settings Table 2.9.1 (3/7) ..............................................2 - 21
Service Personnel Initial Settings Table 2.9.1 (4/7) ..............................................2 - 22
Service Personnel Initial Settings Table 2.9.1 (5/7) ..............................................2 - 23
Service Personnel Initial Settings Table 2.9.1 (6/7) ..............................................2 - 24
Service Personnel Initial Settings Table 2.9.1 (7/7) ..............................................2 - 25
TEL/FAX Automatic Switching ............................................................................2 - 26
TEL/FAX Mode Flow Chart..................................................................................2 - 27
TAD Mode Flow Chart (Type 1) ...........................................................................2 - 28
TAD Mode Flow Chart (Type 2) ...........................................................................2 - 29
2.9.3 Technical Functions Example................................................................................2 - 30
Technical Functions 01 to 11 (Table 2.9.2, 1/5) .................................................... 2 - 32
Technical Functions 12 to 16 (Table 2.9.2, 2/5) ....................................................2 - 33
Technical Functions 17 to 23 (Table 2.9.2, 3/5) ....................................................2 - 34
Technical Functions 24 to 27 (Table 2.9.2, 4/5) ....................................................2 - 35
Technical Functions 28 to 31 (Table 2.9.2, 5/5) ....................................................2 - 36

Table of Contents TOC - 2 OKIOFFICE 44
Service Manual, P/N 59276801
2.9.4 User’s Functions ....................................................................................................2 - 37
User's Functions.....................................................................................................2 - 38
Feature Specifications Table 2.9.3 (1/3) ................................................................2 - 38
Feature Specifications Table 2.9.3 (2/3) ................................................................2 - 39
Feature Specifications Table 2.9.3 (3/3) ................................................................2 - 40
One-Touch Key Program Settings (Flowchart) .....................................................2 - 41
One-Touch Key Program Settings [Table 2.9.4} (1/4) ..........................................2 - 42
One-Touch Key Program Settings Table [2.9.4] (2/4)...........................................2 - 43
One-Touch Key Program Settings [Table 2.9.4] (3/4)...........................................2 - 44
One-Touch Key Program Settings [Table 2.9.4] (4/4)...........................................2 - 45
User Function Program Settings Table 2.9.4 (1/4) ................................................2 - 46
Function Program ..................................................................................................2 - 46
User Function Program Settings Table 2.9.4 (2/4) ................................................2 - 47
User Function Program Settings Table 2.9.4 (3/4) ................................................2 - 48
User Function Program Settings Table 2.9.4 (4/4) ................................................2 - 49
2.9.5 User's Functions Example .....................................................................................2 - 50
Function Program ..................................................................................................2 - 50
User's Functions Table 2.9.5 (1/2) ........................................................................2 - 51
User's Functions Table 2.9.5 (2/2) ........................................................................2 - 52
Ring Response Time..............................................................................................2 - 54
Dial Parameters (Service Bit "OFF") ...................................................................2 - 55
2.9.6 Clock Adjustment ..................................................................................................2 - 56
2.9.7 Dual Access Operation ..........................................................................................2 - 57
2.9.8 System Data Programming....................................................................................2 - 58
2.9.9 Dial Parameters Settings........................................................................................2 - 60
Procedure ...............................................................................................................2 - 60
Dial Parameters Settings (Table 2.9.6) ..................................................................2 - 62
2.9.10 Off-line Tests .........................................................................................................2 - 63
Purpose ................................................................................................................2 - 63
Procedure ...............................................................................................................2 - 63
Self-Diagnosis Print Test (Example) Figure 2.9.4.................................................2 - 64
2.9.11 On-line Tests.......................................................................................................... 2 - 65
Transmission..........................................................................................................2 - 65
Reception ...............................................................................................................2 - 65
Typical Transmission Flow (Fig. 2.9.5)................................................................2 - 66
Typical Reception Flow (Fig. 2.9.6)......................................................................2 - 67
2.9.12 Installation of Optional Units ................................................................................2 - 68
Items ................................................................................................................2 - 68
Procedure ...............................................................................................................2 - 68
Memory Board Installation....................................................................................2 - 69
CTR (PC interface) Board Installation ..................................................................2 - 70
Optional Telephone Set Installation.......................................................................2 - 71

Table of Contents TOC - 3 OKIOFFICE 44
Service Manual, P/N 59276801
Section 3: BriefTechnical Description ...................................................3 - 1
Electrophotographic Process Flow ..................................................................................................3 - 1
3.1 Fundamentals of the Electro-Photographic Process ............................................................3 - 2
3.2 Actual Electrophotographic Process....................................................................................3 - 5
3.3 Boards and Units .................................................................................................................3 - 6
Block Diagram (Figure 3.3.1).............................................................................................. 3 - 7
3.4 Overall Dimension and Mechanical Structure.....................................................................3 - 8
Section 4: Disassembly ........................................................................... 4 - 1
4.1 General................................................................................................................................. 4 - 1
4.1.1 Precautions for Parts Replacement ..........................................................................4 - 1
Service Caution .......................................................................................................4 - 2
4.1.2 Tools ........................................................................................................................ 4 - 3
4.1.3 How to Disassemble and Reassemble .....................................................................4 - 3
Disassembly Procedure Flow Figure 4.1 (1/2) ........................................................4 - 4
Disassembly Procedure Flow Figure 4.1 (2/2) ........................................................4 - 5
Whole Unit Picture ..................................................................................................4 - 6
4.1.3.1 LED Print Head ........................................................................................4 - 7
4.1.3.2 Image Drum and Covers (Rear, NCU, Main) and NCU Board................4 - 8
4.1.3.3 Unit-048 OPE-Panel ...............................................................................4 - 10
4.1.3.4 Separation Rubber, Sensor Frame Roller Assembly (U) ........................ 4 - 11
4.1.3.5 Roller Assembly-ADF, CIS, Lever-PC1 and PC2 ..................................4 - 12
4.1.3.6 Board-R44, OKIOFFICE 44 Power Supply Unit...................................4 - 14
4.1.3.7 Option (Board-Memory: MEM, Board-CTR; PC Interface).................. 4 - 16
4.1.3.8 Printer Unit Section ................................................................................4 - 17
4.1.3.9 Transfer Roller........................................................................................4 - 18
4.1.3.10 High-Voltage Power Supply Unit (TLHV/OLHV) ................................4 - 19
4.1.3.11 Holder Assembly .................................................................................... 4 - 20
4.1.3.12 Plate-Side M and Gear-Idle ....................................................................4 - 21
4.1.3.13 Registration Roller..................................................................................4 - 22
4.1.3.14 Drive Shaft E (Eject) and Eject Roller ...................................................4 - 23
4.1.3.15 Heat Assembly........................................................................................4 - 24
4.1.3.16 Pressure Roller B (Back Up Roller) .......................................................4 - 25
4.1.3.17 Hopping Shaft Assembly ........................................................................ 4 - 26
4.1.3.18 Paper Sensor E, Paper Sensor Exit and Toner Sensor Assembly ........... 4 - 27
4.1.3.19 Printer Unit .............................................................................................4 - 28
Section 5: Adjustments ........................................................................... 5 - 1
5.1 Setting of LED Print Head Drive Time ............................................................................... 5 - 1
Settings of Technical Function No. 27 (Table 5.1.1)........................................................... 5 - 1
5.2 Confirmation Items..............................................................................................................5 - 2
Service Caution ...................................................................................................................5 - 3
5.3 Measurement ....................................................................................................................... 5 - 4
Service Caution ...................................................................................................................5 - 5

Table of Contents TOC - 4 OKIOFFICE 44
Service Manual, P/N 59276801
Section 6: Cleaning and Maintenance....................................................6 - 1
6.1 Consumables Replacement..................................................................................................6 - 1
User Replaceable Items Life...............................................................................................6 - 1
Service Parts Life................................................................................................................. 6 - 1
Consumables Diagram (Figure 6.1.1).................................................................................. 6 - 1
Others .................................................................................................................................6 - 3
Reliability Table (6.1.1.)..........................................................................................6 - 3
6.2 Preventative Maintenance.................................................................................................... 6 - 4
Preventative Maintenance (Table 6.2.1) ..............................................................................6 - 4
Preventative Maintenance Diagram (Figure 6.2.1) ................................................. 6 - 5
6.3 Printer Counter Display/Clear (User) ..................................................................................6 - 6
6.4 Printer Counter Display/Clear (Service)..............................................................................6 - 7
6.5 Self-Diagnosis Test.............................................................................................................. 6 - 9
Self-Diagnosis Test Sample (Figure 6.5.1.)...........................................................6 - 10
Explanation of Self-Diagnosis Test Items ............................................................. 6 - 11
6.6 Sensor Calibration Test......................................................................................................6 - 12
6.7 LED Test............................................................................................................................ 6 - 14
6.8 Tone Send Test...................................................................................................................6 - 15
6.9 High-speed Modem Send Test...........................................................................................6 - 16
High-speed Modem Send and Receive Test Diagram (Figure 6.9.1) ....................6 - 17
6.10 High-speed Modem Receive Test......................................................................................6 - 18
6.11 MF Send Test.....................................................................................................................6 - 19
6.12 Tone (TEL/FAX) ............................................................................................................... 6 - 20
6.13 Protocol Data Dump Printing ............................................................................................6 - 21
Sample Protocol Data Dump (Figure 6.13.1) ....................................................................6 - 22
Data Analysis (Figure 6.13.2)............................................................................................6 - 23
Facsimile Control Field Conversion Table ........................................................................6 - 24
6.14 System Reset ..................................................................................................................... 6 - 25
6.15 Service Code......................................................................................................................6 - 27
Service Code List [Table 6.15.1] (1/2) ............................................................................. 6 - 28
Service Code List [Table 6.15.1] (2/2) ............................................................................. 6 - 29
Section 7: Troubleshooting......................................................................7 - 1
7.1 Overview ............................................................................................................................. 7 - 1
Service Caution .......................................................................................................7 - 2
7.1.1 Overall Troubleshooting Flow Chart....................................................................... 7 - 3
7.1.2 No LCD Operation .................................................................................................. 7 - 4
7.1.3 ALARM LED On ....................................................................................................7 - 5
7.1.4 Printing Test Failure ................................................................................................7 - 6
7.1.5 No Local Copy ........................................................................................................7 - 7
7.1.6 Auto Dial Failure .....................................................................................................7 - 9
7.1.7 Transmission Problem ...........................................................................................7 - 10
7.1.8 Auto Reception Failure..........................................................................................7 - 13
7.1.9 Reception Problem ................................................................................................7 - 14
7.1.10 Sensor Calibration Test..........................................................................................7 - 16
7.1.11 LED Test................................................................................................................7 - 17

Table of Contents TOC - 5 OKIOFFICE 44
Service Manual, P/N 59276801
7.1.12 Tone Send Test.......................................................................................................7 - 19
7.1.13 High-speed Modem Test........................................................................................7 - 20
7.1.14 MF Send Test.........................................................................................................7 - 22
7.1.15 Tone (TEL/FAX) Send Test...................................................................................7 - 23
7.1.16 No Acoustic Line Monitor..................................................................................... 7 - 24
7.1.18 No Document Feeding...........................................................................................7 - 25
7.1.19 Multiple Document Feeding..................................................................................7 - 27
7.1.20 Document Skew.....................................................................................................7 - 28
7.1.21 Document Jam .......................................................................................................7 - 30
7.1.22 Printer Unit ............................................................................................................7 - 31
7.1.22.1 Precautions .............................................................................................7 - 31
7.1.22.2 Troubleshooting Flow Charts of Printer Unit .........................................7 - 32
Overall Troubleshooting Flowchart........................................................7 - 32
1: Top Cover is Open.............................................................................7 - 33
2: Replace Image Drum Message.......................................................... 7 - 34
3: Engine Controller Error..................................................................... 7 - 35
4: Fuser Unit Thermal Error ..................................................................7 - 36
5: Paper Jams .........................................................................................7 - 37
6: No Paper Tray or No Paper ...............................................................7 - 38
Action Items (Printer Unit-LCD Message) Table 7.1.22.2.....................7 - 39
Sample Image Problems (Figure 7.1.22.1) .............................................7 - 40
7.1.22.3 Image Problems Table ........................................................................... 7 - 40
7: Light or Blurred Output.....................................................................7 - 41
8: Smeared Background on Output ....................................................... 7 - 42
9: Blank Output .....................................................................................7 - 43
10: Vertical Black Stripes on Output .....................................................7 - 44
11: Evenly Spaced Marks on Output .....................................................7 - 45
12: Missing Print on Output ..................................................................7 - 46
13: Vertical White Stripes on Output.....................................................7 - 47
14: Poor Fusing......................................................................................7 - 48
Section 8: Dipswitch Settings ................................................................. 8 - 1
8.1 General Information ............................................................................................................ 8 - 1

Table of Contents TOC - 6 OKIOFFICE 44
Service Manual, P/N 59276801
Appendix A: Board Descriptions ........................................................... A - 1
PREFACE....................................................................................................................................... A - 1
Service Caution .................................................................................................................. A - 1
A1.1 Unit Configuration and Block Diagram ............................................................................. A - 3
OKI OFFICE44 Block Diagram Figure (A1.2.1)............................................................... A - 4
Block Diagram Abbreviations ............................................................................................ A - 5
A1.2 Function of Each Unit ........................................................................................................ A - 6
Main Control (R44) Board ................................................................................................ A - 6
Operation Panel Unit: O4W Board.................................................................................... A - 6
NCU Board (UNC5)........................................................................................................... A - 7
Power Supply Unit ............................................................................................................. A - 7
Memory Board (Option)..................................................................................................... A - 7
CTR Board (PC Interface).................................................................................................. A - 7
HOOK Board (Option) ....................................................................................................... A - 7
TELU Board (Option) ........................................................................................................ A - 7
A2.1 Signal Flow Explanation .................................................................................................... A - 8
Copy Mode ......................................................................................................................... A - 8
Copy Picture Signal (Figure A2.1.1) .................................................................................. A - 9
G3 Send Mode .................................................................................................................. A - 10
G3 Send Picture Signal (Figure A2.1.2) ........................................................................... A - 11
G3 Receive Mode ............................................................................................................. A - 12
G3 Receive Picture Signal (Figure A2.1.3) ...................................................................... A - 13
300 bps Send Mode .......................................................................................................... A - 14
300 bps Send Signal (Figure A2.1.4 )............................................................................... A - 15
300 bps Receive Mode ..................................................................................................... A - 16
300 bps Receive Signal (Figure A2.1.5)........................................................................... A - 17
Report Printing ................................................................................................................. A - 18
Report Print Signal (Figure A2.1.6) ................................................................................. A - 19
Memory Transmission ...................................................................................................... A - 20
Memory Reception .......................................................................................................... A - 20
A3.3 OPE (04W) Circuit Diagram ............................................................................................ A - 42
A3.5 Power Supply Unit for OKIOFFICE 44 ........................................................................... A - 44
A3.5.1 048 POW (120V/230V) Circuit Diagram............................................................. A - 44
Block Diagram of 048 POW (FigureA3.5.1)................................................................... A - 46
Service Caution .................................................................................................... A - 47
A3.5.2 OLHV/TLHV Circuit Diagram (2/2) ................................................................... A - 47
A3.7 UNC5 (NCU) Circuit Diagram......................................................................................... A - 51
Block Diagram of UNC (Figure A3.7.1) .......................................................................... A - 53
A3.8 TELU Circuit Diagram (Option) ...................................................................................... A - 54
Block Diagram of TEL-U (Option) Fig. A3.8.1 ............................................................... A - 55
A3.10 MEMO (Memory) Circuit Diagram (Option) .................................................................. A - 56
Related Signals of Memory Board (Option) (Figure A3.10.1)......................................... A - 57

Table of Contents TOC - 7 OKIOFFICE 44
Service Manual, P/N 59276801
Appendix B: Print Operation Description ............................................. B - 1
B1.1 Electrophotographic Processor ........................................................................................... B - 1
Layout Drawing of Electrophotographic Processor (Figure B1.1)..................................... B - 1
Paper Feeding Diagram (Figure B1.2) ............................................................................... B - 3
B1.2 Electrophotographic Process .............................................................................................. B - 4
Electrophotographic Process Diagram (Figure B1.3)......................................................... B - 5
B1.2.1 Operations Process Explanations............................................................................ B - 6
Hopping ................................................................................................................. B - 6
Printing and Warm-up............................................................................................. B - 7
Exposure ................................................................................................................. B - 8
Charging ................................................................................................................. B - 8
Development........................................................................................................... B - 9
Transfer ............................................................................................................... B - 10
Fusing ............................................................................................................... B - 11
Cleaning ............................................................................................................... B - 11
Paper Feed Check List...................................................................................................... B - 12
B1.3 Paper Jam Detection ......................................................................................................... B - 12
Timing Chart for Paper Feed (Tray Feed) ........................................................................ B - 13
B1.4 Toner Low Detection ........................................................................................................ B - 14
B1.5 Cover Open....................................................................................................................... B - 16
Appendix C: Circuit Diagrams................................................................ C - 1
C.1 General Information ........................................................................................................... C - 1
Appendix D: Illustrated Parts List.......................................................... D - 1
Section 1: Cabinet Assembly 1/2.................................................................................................. D - 2
Section 1: Cabinet Assembly 2/2.................................................................................................. D - 4
Section 2: Printer Unit ................................................................................................................... D - 6
Section 3: Operator Panel .............................................................................................................. D - 8
Section 4: Operator Panel Assembly ........................................................................................... D - 10
Section 5: Frame Assembly Scanner (L) .....................................................................................D - 12
Section 6: Plate Assembly-Scanner (B)....................................................................................... D - 14
Section 7: Plate Assembly-Scanner (R)....................................................................................... D - 16
Section 8: Frame Assembly-Scanner (U) .................................................................................... D - 18
Section 9: Cover Assembly-Top .................................................................................................. D - 20
Section 10: Plate Assembly-Base ................................................................................................ D - 22
Section 11: Printer Base Frame Unit (1 of 2) .............................................................................. D - 24
Section 11: Printer Base Frame Unit (2 of 2) .............................................................................. D - 26
Section 12: Cables ....................................................................................................................... D - 28
Section 13: Miscellaneous Items ................................................................................................. D - 30
Whole Unit ....................................................................................................................... D - 30
Consumables..................................................................................................................... D - 30
Options ............................................................................................................................. D - 30
Packaging ......................................................................................................................... D - 30
User’s Manuals ................................................................................................................. D - 31
Service (Technical) Manuals ............................................................................................ D - 31

Table of Contents TOC - 8 OKIOFFICE 44
Service Manual, P/N 59276801
Appendix E: Board Layout ......................................................................E - 1
E.1 TLHV PCB ......................................................................................................................... E - 1
Service Caution .................................................................................................................. E - 1
E.2 MEM PCB .......................................................................................................................... E - 2
E.3 TEL-U PCB ........................................................................................................................ E - 3
E.4 Hook PCB........................................................................................................................... E - 4
Appendix F: Second Paper Feeder.........................................................F - 1
F.1 General Information ............................................................................................................F - 1
Appendix G: RMCS System.................................................................... G - 1
Introduction .................................................................................................................................... G - 1
1. Notes to Users..................................................................................................................... G - 2
1.1 Identifying the Packaged Contents ......................................................................... G - 2
1.2 Required Devices.................................................................................................... G - 2
1.3 Connectable Peripheral Equipment ........................................................................ G - 2
2. Setup ................................................................................................................................... G - 3
2.1 Mounting ................................................................................................................ G - 3
2.1.1 Mounting Procedures............................................................................... G - 3
2.2 Installation .............................................................................................................. G - 4
2.2.1 Registering the RMCS Basic System ...................................................... G - 5
2.2.2 Registering the Facsimile Model No. ...................................................... G - 8
2.2.3 Deleting the Facsimile Model No............................................................ G - 9
2.2.4 Updating the Password .......................................................................... G - 10
2.2.5 Updating the Dip Switches .................................................................... G - 11
2.2.6 Deleting the RMCS Basic System.........................................................G - 12
3. RMCS Basic Operation .................................................................................................... G - 13
3.1 Activating and Terminating the system ................................................................G - 13
3.1.1 To Activate.............................................................................................G - 13
3.1.2 Entering the ID and Password ............................................................... G - 13
3.2 TEL Directory....................................................................................................... G - 14
3.2.1 To Terminate .......................................................................................... G - 14
3.2.2 Selecting Destination Drive................................................................... G - 14
3.3 Main Menu ........................................................................................................... G - 15
3.4 Environment Setting ............................................................................................. G - 15
4. Message Modifying Tool.................................................................................................. G - 16
4.1 Activating the Program......................................................................................... G - 16
4.2 Modifying Message .............................................................................................. G - 16
4.2.1 File Selection ......................................................................................... G - 17
4.3 Saving Message .................................................................................................... G - 17
4.3.1 Confirmation.......................................................................................... G - 18
4.4 Loading Message.................................................................................................. G - 18
4.4.1 Confirmation.......................................................................................... G - 19
4.5 Other Message File............................................................................................... G - 19

Table of Contents TOC - 9 OKIOFFICE 44
Service Manual, P/N 59276801
Appendix H: Product Service Bulletins................................................. H - 1
H.1 General Information ........................................................................................................... H - 1
OKIDATA's Web Site ......................................................................................................... H - 1
Faxable Facts ...................................................................................................................... H - 1
OKILINK II........................................................................................................................ H - 1
Service Caution .............................................................................................................................. H - 3
Appendix I: Recommended Spare Parts List (RSPL).............................I - 1
I.1 General Information .............................................................................................................I - 1
OKIDATA's Web Site ...........................................................................................................I - 1
Faxable Facts ........................................................................................................................I - 1
OKILINK II..........................................................................................................................I - 1

Table of Contents TOC - 10 OKIOFFICE 44
Service Manual, P/N 59276801
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General Information 1 - 1 OKIOFFICE 44
Service Manual, P/N 59276801
Section 1: General Information
1.1 General Performance
(1) Type of appearance
• Desktop type
(2) Applicable lines
• Public switched telephone network (PSTN)
• Private branch exchange (PBX)
(3) Compatibility
• ITU-T Group 3 facsimile transceiver
(4) Document width
• Max. 216 mm (8.5 inches [North American Letter])
• Min. 148 mm (5.83 inches [ISO A5 size])
(5) Effective reading width
• Max. 215 mm (8.46 inches)
(6) Scanning length
• 128 mm to 356 mm (5.06 inches to 14 inches)
(Length setting: Infinite is also available.)
(7) Automatic document feeder (ADF)
• 20 sheets for OKIOFFICE44 North American Letter/A4-size: 20-1b bond
• 15 sheets (North American Letter/A4-size: 13 to 28-1b bond)
(8) Recording paper or sheet
• First tray: North American Letter/Legal/A4-size plain paper cut
OKIOFFICE 44 100 sheets capacity (20-1b bond*)
• Manual loading feeder: Transparency for overhead projector, applicable.
OKIOFFICE 44 Sheet size: Letter/Legal/A4-size
* Recommended paper
(9) Printable width
For OKIOFFICE44
• North American: 203.2 mm (8 inches) / 203.2 mm (8 inches) for assured quality
• North American Legal: 203.2 mm (8 inches) / 203.2 mm (8 inches) for assured quality
• ISO A4: 203.2 mm (8 inches) / 197.3 mm (7.77 inches) for assured quality
(10) Printable length
• NA Letter: 273.4 mm (10.76 inches) / 266.7 mm (10.49 inches) for assured quality
• NA Legal: 349.6 mm (13.76 inches) / 342.9 mm (13.49 inches) for assured quality
• ISO A4: 291 mm (11.46 inches) / 284.3 mm (11.19 inches) for assured quality

General Information 1 - 2 OKIOFFICE 44
Service Manual, P/N 59276801
(11) Copy stacker
• Maximum 30 sheets (20 lb. bond *)
*: Recommended paper
(12) Scanning resolution
a) Horizontal
• 8 pels/mm
b) Vertical
Transmission mode: STD 3.85 line/mm
FINE 7.7 line/mm
EX. FINE 15.4 line/mm
COPY mode: FINE 7.7 line/mm
EX. FINE) 15.4 line/mm
(13) Scanning method
• 1728 bits contact image sensor
(14) Recording resolution
a) Horizontal:
300 dots/inch
b) Vertical:
Variable: Automatically adjusted to the paper length.
STD mode (3.85 to 5.06 line/mm)
FINE mode (7.7 to 10.13 line/mm)
Fixed: STD mode: 3.85 line/mm
FINE mode: 7.7 line/mm
EX-FINE mode : 15.4 line/mm
: 300 dot/inch
(15) Recording method
• 211.3 mm (2496 bit) or 216.7 mm (2560 bit)
(16) Minimum scan line time for reception
• When receiving from OKIFAX or ECM: 0 ms
• When receiving from non- OKIFAX and non ECM: 10 ms at 3.85 line/mm
5 ms at 7.7 line/mm
(17) Print speed
• Max. 4 sheets per minute
(18) Pre-heating time
• Approx. 30 sec. (Standby to print)

General Information 1 - 3 OKIOFFICE 44
Service Manual, P/N 59276801
(19) Coding scheme
• Modified Huffman (MH)
• Modified READ (MR)
• Modified Modified READ (MMR)
(20) Modem (Rev. 2)
• ITU-T Rec. V.29: 9600/7200 bps
• ITU-T Rec. V.27 ter: 4800/2400 bps
• ITU-T Rec. V.21 channel 2: 300 bps
• ITU-T Rec. V.17: 14400/12000 bps
• ITU-T Rec. V.33: 14400/12000 bps
(21) Transmission speed
• 6 sec. per sheet of ITU-T No. 1 sample document
Note: This is Phase C time at 3.85 line/mm and 28800 bps for 3 sec. and 14400 bps for 6 sec. in
MMR code transmission.
(22) Protocol
• ITU-T Rec. T.30
• OKI special protocols: High-speed protocol
(23) Error correction mode (ECM)
(24) Communication mode
• Half duplex
(25) Memory capacity
• Basic model: 256k byte
• Optional memory: 1M byte memory board can be added.
(26) Liquid crystal display (LCD)
• Two rows of 20 characters for operation guidance, check and various kinds of information
(27) Power source
• Nominal input voltage 120 VAC
(28) MFP (Multi- Function Peripheral) function
• The optional board (CTR board) provides the MFP functions
PC Printer Function
PC Scanner Function
PC FaxModem Function
Location Programing Function

General Information 1 - 4 OKIOFFICE 44
Service Manual, P/N 59276801
1.2 General User's Function
(1) Transmit mode
• Automatic transmit mode
• Manual transmit mode
(2) Receive mode
• Automatic receive mode
• Manual receive mode
• TEL/FAX automatic switchover mode
• TAD mode
• PC Mode
(3) Dual Access
Not available for the OKIOFFICE 44
(4) Voice request
(5) Automatic redial
(6) Last number redial (Manual redial)
(7) Local copy including multiple copies
• Maximum 50 copies of document
(8) Sender identification (Sender ID)
(9) Personal identification (Personal ID)
(10) Polling transmission
(11) Polling reception
(12) Acoustic line monitor
(13) Telephone handset (option)
(14) Automatic alternate selecting call (FAX No. + FAX No. can be registered in one-touch keys).
(15) Delayed transmission (Maximum length of delay 3 days)
• Delayed broadcast
• Delayed transmission
1 specified time
(16) Relay broadcast initiate
(17) Confidential message transmission (Hopper 1 station)
(18) Confidential message reception
Not Available for the OKIOFFICE 44
(19) PHOTO mode
• 16 scale gradations (Dither Method)

General Information 1 - 5 OKIOFFICE 44
Service Manual, P/N 59276801
(20) G3 sequential broadcast (Memory)
• Broadcast mode
56 stations at maximum
• Delayed broadcast mode
(21) No paper/no toner reception
(22) Memory-only reception
Not available for the OKIOFFICE 44
(23) Distinguishing Text from picture
(24) Page re-transmission (Only in case of memory TX mode)
Retransmits in page units
(25) Reduction printing (Reduction rate is from 100% to 75%.) (Legal to Letter)
(26) Smoothing printing (In case of 3.85R/mm →7.7R/mm)
(27) Programmed key operation (“F” key + “OT” key)
(28) Auto dialing
• One-touch dialing 10 locations, maximum of 32 digits each location
• Two-digit automatic dialing 45 locations, maximum of 32 digits each location
• Keypad dialing
• Chain dialing
• Mixed dialing
• Group dialing 5 dialing groups, maximum of 55 locations each group
(29) Realtime dialing
(In case of optional handset is installed or Hook key)
(30) Automatic pause signal insertion
(31) Manual feeder local copy
(32) Telephone directory (Alpha search) dialing
(33) TEL/FAX automatic switching
(34) Time and date printing
(35) Closed users group (Direct mail rejection)
(36) Transmission contrast and resolution control
(37) Key touch tone
(38) Printer counter display (For drum, toner, total print)
(39) Total page counter (Scan)
(40) Quick scanning
Not available for the OKIOFFICE 44

General Information 1 - 6 OKIOFFICE 44
Service Manual, P/N 59276801
(41) Date and clock adjustment
(42) PC interface
• Standard
(43) Language selection
• 2 languages (LCD and Reports)
English / Spanish
English / French
(42) Fax forwarding
Not available for the OKIOFFICE 44
(44) Reports
• Activity report
• Protocol report (Service man setting)
• Message confirmation report (Single address or multiple addresses)
• Broad cast entry report (Broadcast)
• Transmission error report
• Confidential reception report
• Configuration report
• Telephone directory
• Power outage report

General Information 1 - 7 OKIOFFICE 44
Service Manual, P/N 59276801
1.3 General Maintenance Functions
(1) Self-diagnosis
• CPU ROM/RAM check
• FLASH (/MASK) memory check (Program, Language, Default)
• RAM check
• RAM check (MEMORY board: option)
• PC-IF board (parallel) check
• Print test
(2) Sensor calibration (Adjustment of scanning level)
(3) LED test
(4) Tone send test
(5) Multi-frequency (MF) send test
(6) High-speed modem send test
(7) High-speed modem receive test
(8) Tone (TEL/FAX) test
(9) Remote diagnosis
(10) System reset
(11) Service default report (Machine setting for service engineer)