OKIDATA Okipage 16n User manual

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OKIPAGE 16n
Service Manual
P/N 59274401

Disclaimer
This document may not be reproduced without the written permission of Okidata Training and
Publications. Every effort has been made to ensure the accuracy of the information ocntained in this
training course. Okidata is not responsible for errors beyond its control.
Copyright / About Information
1997 by Okidata. All rights reserved.
First Release P/N 59274401 February, 1997
Written by:
OKI Data Corporation
11-22, Shibaura 4-chome, Minato-ku, Tokyo 108, Japan
Tel: +81 (Japan)-3 (Tokyo)-5445-6159 Fax: [phone]
Revised by Okidata Training and Publications
Contact
Please address any comments on this publication to:
OKIDATA
Training and Publications
532 Fellowship Road
Mount Laurel, NJ 08054-3499
Okilink Login Name: Technical Training
Internet Web Site: okidata.com
Copyright Listing
OKIDATA is a registered trademark of Oki America, Inc.
OKIDATA est une marque déposée de Oki America, Inc.
Adobe and PostScript are trademarks of Adobe Systems Incorporated, which may be registered in certain
jurisdictions.
Centronics is a registered trademark of Centronics Data Corporation.
HP and LaserJet are registered trademarks of Hewlett-Packard Company.
LocalTalk is a registered trademark of Apple Computer Inc.

Table of Contents TOC - 1 OKIPAGE 16n
Service Manual, P/N 59274401
Contents
1. CONFIGURATION............................................................................................................... 1 - 1
1.1 System Configuration .......................................................................................................1 - 1
1.2 Printer Configuration........................................................................................................1 - 2
1.3 Optional Configuration.....................................................................................................1 - 3
1.4 Specification .....................................................................................................................1 - 5
1.5 Safety Standards ...............................................................................................................1 - 7
1.5.1 Certification Label .............................................................................................................................. 1 - 7
1.5.2 Warning Label..................................................................................................................................... 1 - 7
2. OPERATION DESCRIPTION............................................................................................. 2 - 1
2.1 Main Control Board (BOARD-COM)..............................................................................2 - 3
2.2 Power Supply Board.........................................................................................................2 - 7
2.3 Relay/Driver Board (AOLC board)..................................................................................2 - 9
2.4 Electrophotographic Process ..........................................................................................2 - 10
2.4.1 Electrophotographic process mechanism ......................................................................................... 2 - 10
2.4.2 Electrophotographic process............................................................................................................. 2 - 12
2.4.3 Process operation descriptions.......................................................................................................... 2 - 15
2.5 Paper Jam Detection .......................................................................................................2 - 24
2.6 Cover Open.....................................................................................................................2 - 25
2.7 Toner Low Detection ......................................................................................................2 - 26
2.8 Stacker-full Detection.....................................................................................................2 - 28
2.9 Page Size Detection ........................................................................................................2 - 28
2.10 PostScript Board (BOARD-PSBA) Optional ................................................................2 - 28
3. PARTS REPLACEMENT..................................................................................................... 3 - 1
3.1 Precautions for Parts Replacement ...................................................................................3 - 1
3.2 Parts Layout......................................................................................................................3 - 3
3.3 How to Change Parts ........................................................................................................3 - 7
3.3.1 Rear cover, side cover (L) Assembly, face-up stacker Assembly, and I/F cover Assembly. .............. 3 - 8
3.3.2 Contact Assembly ............................................................................................................................... 3 - 9
3.3.3 DC fan motor .................................................................................................................................... 3 - 10
3.3.4 Manual feed hopper Assembly ......................................................................................................... 3 - 11
3.3.5 Side cover (R) (operator panel Assembly)........................................................................................ 3 - 12
3.3.6 Earth plate BK (R) (BOARD-PSBA, BOARD-COM)..................................................................... 3 - 13
3.3.7 Stacker cover Assembly, damper arm, and washer........................................................................... 3 - 14
3.3.8 Damper ............................................................................................................................................. 3 - 15
3.3.9 Stacker full sensor Assembly ............................................................................................................ 3 - 16
3.3.10 Cable cover (cable guidesA and B).................................................................................................. 3 - 17
3.3.11 Eject roller Assembly........................................................................................................................ 3 - 18
3.3.12 Paper supply guide D........................................................................................................................ 3 - 19
3.3.13 Separator F........................................................................................................................................ 3 - 20
3.3.14 Front feeder rollerAssy .................................................................................................................... 3 - 22
3.3.15 Hopping motor.................................................................................................................................. 3 - 23
3.3.16 Front feeder paper end sensor........................................................................................................... 3 - 25
3.3.17 Main chassis unit .............................................................................................................................. 3 - 26
3.3.18 Registration roller ............................................................................................................................. 3 - 29
3.3.19 Drum motor ...................................................................................................................................... 3 - 30
3.3.20 Idle gear ............................................................................................................................................ 3 - 32

Table of Contents TOC - 2 OKIPAGE 16n
Service Manual, P/N 59274401
3.3.21 Fusing Assembly............................................................................................................................... 3 - 33
3.3.22 Fuser pressure roller ......................................................................................................................... 3 - 34
3.3.23 EP lock shaft ..................................................................................................................................... 3 - 35
3.3.24 Hopping roller Assembly .................................................................................................................. 3 - 36
3.3.25 Outlet sensor lever ............................................................................................................................ 3 - 37
3.3.26 Toner sensor lever............................................................................................................................. 3 - 38
3.2.27 Paper sensor lever ............................................................................................................................. 3 - 39
3.3.28 Inlet sensor lever............................................................................................................................... 3 - 41
3.3.29 Power Supply Board / Insulator........................................................................................................ 3 - 42
3.3.30 Paper end lever ................................................................................................................................. 3 - 45
3.3.31 Guide rail (L)Assembly ................................................................................................................... 3 - 46
3.3.32 Guide rail (R)Assembly ................................................................................................................... 3 - 48
3.3.33 Cover Frame ..................................................................................................................................... 3 - 50
3.3.34 LED head .......................................................................................................................................... 3 - 51
3.3.35 Separator Assembly .......................................................................................................................... 3 - 52
3.3.36 Transfer roller ................................................................................................................................... 3 - 53
4. ADJUSTMENT...................................................................................................................... 4 - 1
4.1 Maintenance Modes And Functions .................................................................................4 - 2
4.1.1 User maintenance mode...................................................................................................................... 4 - 4
User maintenance mode menu system................................................................................................ 4 - 5
4.1.2 System maintenance mode ................................................................................................................. 4 - 7
4.1.3 Engine maintenance mode ................................................................................................................ 4 - 10
4.1.4 EEPROM initialization ..................................................................................................................... 4 - 14
4.2 Adjustment When ReplacingA Part ...............................................................................4 - 15
4.2.1 Setting of LED head drive time ........................................................................................................ 4 - 15
4.2.2 Resetting the fuser counter ............................................................................................................... 4 - 18
4.2.3 Destination setting ............................................................................................................................ 4 - 18
5. PERIODIC MAINTENANCE................................................................................................... 1
5.1 Periodic Part Replacement..................................................................................................... 1
5.2 Cleaning................................................................................................................................. 1
5.2.1 Cleaning of LED lens array ......................................................................................................................1
6. TROUBLESHOOTING PROCEDURES............................................................................ 6 - 1
6.1 Troubleshooting Tips ........................................................................................................ 6 - 1
6.2 Points to Check before Correcting Image Problems ........................................................6 - 1
6.3 Tips for Correcting Image Problems ................................................................................6 - 1
6.4 Preparation for Troubleshooting.......................................................................................6 - 2
Operator Panel Display....................................................................................................................... 6 - 2
6.5 Troubleshooting Flow.......................................................................................................6 - 2
6.5.1 LCD Status Message/Trouble List...................................................................................................... 6 - 2
6.5.2 LCD message troubleshooting.......................................................................................................... 6 - 15
1 The printer does not work normally after being turned on.............................................6 - 16
[JAM error]..............................................................................................................................6 - 20
2-1 Paper input jam (1st tray) ...............................................................................................6 - 20
2-2 Paper input jam (front feeder) ........................................................................................6 - 21
2-3 Paper feed jam ................................................................................................................6 - 22
2-4 Paper exit jam .................................................................................................................6 - 25
3 Paper size error ...............................................................................................................6 - 27
4 Fuser unit error (ERROR 71), (ERROR 72), (ERROR 73) ...........................................6 - 28
5 I/F time-out between printer and optional tray (ERROR 81).........................................6 - 30
6 I/F time-out occurs between the printer and the operator panel (ERROR 80) . .............6 - 31

Table of Contents TOC - 3 OKIPAGE 16n
Service Manual, P/N 59274401
7 Communications with the host cannot be performed via the parallel interface. ............6 - 32
8 Data cannot be received through the OKI HSP interface ...............................................6 - 33
9 Synchronous serial I/O error (ERROR 74).....................................................................6 - 34
6.5.3 Image troubleshooting ...................................................................................................................... 6 - 35
1 Image are light or blurred ...............................................................................................6 - 36
2 Dark background density................................................................................................6 - 37
3 Black paper is output. .....................................................................................................6 - 37
4 Black belts or stripes in the vertical direction ................................................................6 - 38
5 Cyclic error .....................................................................................................................6 - 39
6 Print voids.......................................................................................................................6 - 40
7 Poor fusing...................................................................................................................... 6 - 41
8 White belts or streaks in the vertical direction ...............................................................6 - 42
9 Snowy print of high density pattern ...............................................................................6 - 43
10 Blockly faded print .........................................................................................................6 - 43
7. WIRING DIAGRAM ........................................................................................................... 7 - 1
7.1 Interconnect Signal Diagram ............................................................................................7 - 1
7.2 PCB Layout ......................................................................................................................7 - 2
7.3 Resistance Check..............................................................................................................7 - 5
7.4 Program/Font ROM Location...........................................................................................7 - 7
8. PARTS LIST........................................................................................................................... 8 - 1
Printer Unit (Figure 8-1 )...........................................................................................................8 - 2
Main Chassis Unit (Figure 8-2 ) 1 of 2......................................................................................8 - 4
Main Chassis Unit (Figure 8-2 ) 2 of 2......................................................................................8 - 6
Front Feeder Unit (Figure 8-3 ) .................................................................................................8 - 8
Base Unit (Figure 8-4 )............................................................................................................8 - 10
APPENDIX A: CENTRONICS PARALLEL INTERFACE .................................................. A - 1
APPENDIX B: HIGH CAPACITY SECOND PAPER FEEDER MAINTENANCE .......... B - 1
Preface ...................................................................................................................................... B - 1
1. Outline ............................................................................................................................. B - 2
1.1 Functions.............................................................................................................................................B - 2
1.2 External View and Component Names ...............................................................................................B - 2
2. Mechanism Description ................................................................................................... B - 3
2.1 General Mechanicsm ..........................................................................................................................B - 3
2.2 Hopper Mechanism.............................................................................................................................B - 4
3. Parts Replacement ........................................................................................................... B - 5
3.1 Precautions Concerning Parts Replacement .......................................................................................B - 5
3.2 Parts Layout ........................................................................................................................................B - 7
3.3 Parts Replacement Methods ...............................................................................................................B - 8
3.3.1 Idle rollers ...........................................................................................................................................B - 9
3.3.2 AOLT-PCB .......................................................................................................................................B - 10
3.3.3 Hopping motor..................................................................................................................................B - 11
3.3.4 Feed roller .........................................................................................................................................B - 12
3.3.5 Hopping roller rubber .......................................................................................................................B - 13
3.3.6 Side frame (L) assy ...........................................................................................................................B - 14
3.3.7 Side frame (R) assy...........................................................................................................................B - 15

Table of Contents TOC - 4 OKIPAGE 16n
Service Manual, P/N 59274401
4. TROUBLESHOOTING ................................................................................................ B - 17
4.1 Precautions Prior to the Troubleshooting .........................................................................................B - 17
4.2 Preparations for the Troubleshooting................................................................................................B - 17
4.3.1 LCD Status Message List .................................................................................................................B - 18
4.3 Troubleshooting Method...................................................................................................................B - 18
4.3.2 Troubleshooting Flow .......................................................................................................................B - 19
5. Connection Diagram...................................................................................................... B - 20
5.1 Interconnection Diagram ..................................................................................................................B - 20
5.2 PCB Layout ......................................................................................................................................B - 21
6. Parts List ........................................................................................................................ B - 22
APPENDIX C: MULTI FEEDER MAINTENANCE ............................................................. C - 1
Preface ...................................................................................................................................... C - 1
1. Outline ............................................................................................................................. C - 2
1.1 Functions.............................................................................................................................................C - 2
1.2 External View and Component Names ...............................................................................................C - 2
2. Mechanism Description ................................................................................................... C - 3
2.1 General Mechanism ............................................................................................................................C - 3
2.2 Hopper Mechanism.............................................................................................................................C - 4
3. Parts Replacement ........................................................................................................... C - 5
3.1 Precautions Concerning Parts Replacement .......................................................................................C - 5
3.2 Parts Layout ........................................................................................................................................C - 7
3.3 Parts Replacement Methods ...............................................................................................................C - 8
3.3.1 Separator .............................................................................................................................................C - 9
3.3.2 AOLE-PCB.......................................................................................................................................C - 10
3.3.3 Square-shaped connector ..................................................................................................................C - 11
3.3.4 Hopping Motor .................................................................................................................................C - 12
3.3.5 Planet gear ........................................................................................................................................C - 13
3.3.6 Roller B.............................................................................................................................................C - 14
3.3.7 Roller A.............................................................................................................................................C - 15
3.3.8 Mini pitch belt & Feed roller ............................................................................................................C - 16
4. Troubleshooting............................................................................................................. C - 17
4.1 Precautions Prior to Troubleshooting ...............................................................................................C - 17
4.2 Preparations for Troubleshooting .....................................................................................................C - 17
4.3 Troubleshooting Method...................................................................................................................C - 17
4.3.1 LCD Status Message List .................................................................................................................C - 18
4.3.2 Troubleshooting Flow .......................................................................................................................C - 19
5. Connection Diagram...................................................................................................... C - 20
5.1 Interconnection Diagram ..................................................................................................................C - 20
5.2 PCB Layout ......................................................................................................................................C - 21
6. Parts List ........................................................................................................................ C - 22
APPENDIX D: LOCALTALK SERIAL INTERFACE (OKIPAGE16N/PS ONLY)........... D - 1

Configuration 1 - 1 OKIPAGE 16n
Service Manual, P/N 59274401
1. CONFIGURATION
1.1 System Configuration
OKIPAGE16n / OKIPAGE16n/PS consists of control and engine blocks as the standard
configuration (See Figure 1-1.)
In addition, the following options are also available.
Printer
Operator
Panel Face down
stacker Face up
stacker
Power/
Sensor
Board
DC Fan
Main control
PC etc.
Centronics
Parallel interface
(Bidirection)
OKI HSP
interface board
(Option)
LAN etc.
Extension RAM
(Option)
: Paper feeding
: Singal flow
*: Consumables
High Capacity
Second Paper
Feeder
(Option)
Multi Feeder
(Option)
Paper size
detection switch
Paper tray
LED head
Drum motor
Registrationmotor
Hopping motor
Front Feeder
Printer
Mechanism
I/D unit *
*
AC IN
120V
230/240V
Toner Cartridge
LocalTalk
(with PS model only)
PostScript
Board
(OKIPAGE16n/PS
only)
Figure 1-1

Configuration 1 - 2 OKIPAGE 16n
Service Manual, P/N 59274401
1.2 Printer Configuration
The printer unit consists of the following hardware components:
• Electrophotographic processor
• Paper feeder
• Controller
• Operator panel
• Power Supply board
Figure 1-2 shows the printer unit configuration.
Figure 1-2

Configuration 1 - 3 OKIPAGE 16n
Service Manual, P/N 59274401
1.3 Optional Configuration
The options below are available for use with OKIPAGE16n / OKIPAGE16n/PS. They are sold
separately from the printer unit.
(1) Multi-Purpose Feeder
(2) High Capacity Second Paper Feeder

Configuration 1 - 4 OKIPAGE 16n
Service Manual, P/N 59274401
(3) RAM module (72 pin SIMM, 1 MB/2 MB/4 MB/8 MB/16 MB/32 MB)
• 16 MB RAM module
• 8 MB RAM module

Configuration 1 - 5 OKIPAGE 16n
Service Manual, P/N 59274401
1.4 Specification
(1) Type Desk top
(2) External dimensions Height 10.6” (270 mm)
(excludes protruding Width 14.4” (366 mm)
Portion) Depth 16.9” (430 mm)
(3) Weight 15.2 kg (33.5 lbs)
(4) Development method Dry electrophotography
Exposure method LED stationary head
(5) Paper used <Type>
• Standard paper
– Xerox 4200 (20 lbs)
• Application paper (manual face-up feed)
– Label
– Envelope
– OHP paper (Transparency)
<Size>
• Standard sizes
– Letter
– Legal
– Executive
– Envelope
–A4
–A5
–B5
–A6
• Applicable sizes
– Width: 3.4” to 8.5” (86 to 216 mm)
– Length: 5.5” to 14” (140 to 355.6 mm)
<Thickness>
– Automatic feed: 16 to 28 lbs (60 to 105 g/m2)
– Manual feed: Label, OHP paper (transparency)
Envelope
(6) Printing speed First print: 10 sec.
Continuous print: 16 sheets/min.
Warm-up time: 90 sec. [at room temperature 77˚F
(25˚C) and rated voltage (120 VAC)]
(7) Paper feed method Automatic feed or manual feed
(8) Paper delivery method Face down/face up
(9) Resolution 600 x 600 dots/inch
(10)Power input 120 VAC + 5.5%, –15%
230/240 VAC + 10%, –14%

Configuration 1 - 6 OKIPAGE 16n
Service Manual, P/N 59274401
(11)Power consumption Peak: Approx. 600W
Typical Operation: Approx. 220W
Idle: Approx. 100W
Power save mode: Approx. 20W
(12)Temperature and humidity
(13) Noise During operation: 50 dB (A) or less
At standby: 45 dB (A) or less
Power save mode: 43 dB (A) or less
(14)Consumables Toner cartridge kit 5,000 (5% duty)
Image drum cartridge 30,000 (at continuous printing)
18,000 (3 page/job)
11,000 (1 page/job)
Temperature 50 - 90 32 - 110 14 - 110 °F
In operation Power off mode During Storage Unit
Maximum wet
bulb temperature
Minimum difference
of wet and dry
bulb temperatures
Humidity
35.6 35.6 °F
77 80.4 °F
(10 - 32) (0 - 43) (–10 - 43) (°C)
20 - 80 10 - 90 10 - 90 %RH
(25) (26.8) (°C)
(2) (2) (°C)
Notes:
1. Storage conditions specified above apply to printers in packed condition.
2. Temperature and humidity must be in the range where no condensation
occurs.
10
28
32
Temperature
(°C)
20 80 Humidity
(
%
)
Operation range

Configuration 1 - 7 OKIPAGE 16n
Service Manual, P/N 59274401
1.5 Safety Standards
1.5.1 Certification Label
The safety certification label is affixed to the printer in the position below.
1.5.2 Warning Label
The warning label is affixed to the portion which may cause bodily injury.
Follow the instructions on warning labels during maintenance.

Configuration 1 - 8 OKIPAGE 16n
Service Manual, P/N 59274401
This page was intentionally left blank.

Operation Description 2 - 1 OKIPAGE 16n
Service Manual, P/N 59274401
2. OPERATION DESCRIPTION
OKIPAGE16n/OKIPAGE16n/PSconsistsofamaincontrolboard,apowersupplyboard,adriver
board, an operator panel and an electrophotographic process mechanism.
The control board receives data through a host I/F, decodes and edits the data, and stores the
editeddatainmemory.Aftercompletingeditionofonepageofdata,itreferencesthefontmemory
and generates bit data on the same memory. At the same time, it transfers the bit image data to
the LED head in units of one dot line.
The electrophotographic process mechanism prints data on paper.
The operator panel is used for operations and status display.
Fig. 2-1 shows an OKIPAGE16n / OKIPAGE16n/PS block diagram.

Operation Description 2 - 2 OKIPAGE 16n
Service Manual, P/N 59274401
Figure 2-1 OKIPAGE16n / OKIPAGE16n/PS block diagram
M
SW
D RAM
LSI
CPU EE
PROM
M
M
FAN
SW
DRIVER
LSI
Heater
DC FAN
Drum motor
Registration
motor
Paper size
detection switch
Hopping motor
Paper end sensor
Stacker full sensor
Home micro switch
Envelope tray
2nd tray
Operator panel
LED head
(Option)
(Option)
0V
+5V
+30V
Main
Control
Board
(BOARD-
COM)
Parallel
Interface
+8V
-8V
Inlet sensor 1
Outlet sensor
Inlet sensor 2
Paper sensor
Paper out sensor
Toner sensor
AOLS-
Relay/Drive Board
(AOLC-PCB)
+5V
High voltage
generation
circuit
Cover
open MS
Low voltage
generation
circuit
Filter
circuit
Power / Sensor board Driver
Charge roller
Transfer roller
Developing roller
Toner supply roller
Cleaning roller
Thermistor
Heat on
Heat on
TH1
TH2
CH
TR
DB
SB
CB
DRIVER
DRIVER
ROM
ROM
SIMM
(Option)
7407
AC-IN
OKI HSP
interface
(option)
LS374
LS374 EEPROM
Z80181
SRAM
ROM
DS8925
*LocalTalk
Interface
*PostScript Board
BOARD-PSBA
(option)
DRIVER

Operation Description 2 - 3 OKIPAGE 16n
Service Manual, P/N 59274401
Built-in device Function
Chip select controller Control of ROM, DRAM and I/O device
Bus controller
DRAM controller
DMA controller Transfer of image data from DRAM to OST LSI
Parallel interface controller Control of Centronics parallel interface
Timer Generation of various control timing
Monitoring of paper running and paper size
Serial I/O port Control of operator panel, EEPROM, and options
I/O port Inputting/outputting of sensor, signal and motor signal
Option I/O interface Control of OKI HSP interface
2.1 Main Control Board (BOARD-COM)
ThecontrolboardconsistsofanonechipCPU,LSIs,program/fontROM's,DRAM's,anEEPROM,
a host interface circuit, and a mechanism driving circuit.
(1) One-chip CPU
The one-chip CPU is a custom CPU (32-bit internal bus, 32-bit external bus, 32-MHz clock)
that incorporates an RISC CPU and its peripheral devices, and has the following functions.
(2) Program/font ROM's
The program/font ROM's store the HP IV emulation program and various types of font.
MASK ROM is used as the program/font ROM's.

Operation Description 2 - 4 OKIPAGE 16n
Service Manual, P/N 59274401
Memory area Use Memory capacity setting
MENU Expansion RAM
System area Fixed Fixed
Raster buffer Enable Expandable
Receive buffer Enable Expandable
Page buffer – Expandable
DLL/macro buffer – Expandable
Font cache buffer Enable Expandable
(3) DRAM's
2-MegabyteDRAM(4MbitDRAMx4)ismountedasresidentmemorytobeusedforstoring
the program and providing various buffers. This DRAM is expandable up to 66 Mbytes by
adding expansion memory (SIMMs). This DRAM provides the areas shown in the following
table.
(4) EEPROM
The EEPROM has a 1-kbit capacity and stores the following data.
• Menu data
• Various counter data (page counter, drum counter, fuser counter, etc.)
• Adjustment parameters (LED head drive time, print start position, etc.)
(5) LSI (MBCE31701-040FP-BND)
This LSI is used as a peripheral device of the CPU and performs smoothing compensation
(OST) of print image data. In addition, it transfers serially bit image data for each dot line to
the LED head.
(6) Host interface
This printer has the following interfaces to the host.
• Centronics bidirectional parallel interface
• OKI HSP interface (Option)
• LocalTalk interface (Option - PostScript Version)
The single effective interface or the automatic interface select mode can be selected using
the menu. If the busy state of the printer continues for a long time period, the buffer near-
full control releases the busy status at constant intervals even if the host side is busy so not
to cause the interface time-out at the host side.
Working area used for the program
Stores converted bit image data
Stores temporarily the data received
from the host interface
Adds print information to the analyzed
receive data and stores the resulted
data.
Stores soft fonts and macro data.
Stores bit map fonts generated by the
font rasterizer based on scalable font
information

Operation Description 2 - 5 OKIPAGE 16n
Service Manual, P/N 59274401
(a) Centronics bidirectional parallel interface
This is an interface conforming to IEEE-1284 and provides either of unidirectional and
bidirectionalcommunicationsaccordingtoeachofthefollowingcommunicationmodes.
• Compatibility mode
Unidirectional communications from the host to the printer.
• Nibble mode
This mode transmits 4-bit wide data from the printer to the host. In this mode, each
1-byte data is transferred in the form of two nibbles using ERROR, BUSY, FAULT,
and SELECT signal leads. This mode can provide the bidirectional operation in
combination with the compatibility mode.
• ECP mode
This mode provides the asynchronous bidirectional interface and transmits and
receives1-bytedatausing eight data signal leadsunder thesemi-duplex control by
the host.
When the power is turned on, the compatibility mode is automatically selected. The
change to another mode from the compatibility mode is made through negotiation.
(WhentheBIDIRECTIONissettoENABLEinthemenu,thischangecanbeperformed.)
(For the electrical/physical characteristics of this interface, see APPENDIX A)
(b) OKI HSP interface (Option)
This interface (slot) is an OKI unique universal interface that provides the platform to
connect various boards (such as the LAN connection expansion board and SCSI
expansion board).
Any expansion boards compatible with this interface can be mounted on the Control
board in the piggyback board without modifying the program at the printer side. The
conceptual diagram of the OKI HSP interface is shown in Fig. 2-2.
Printer
Control board LAN
expansion board
OKI HSP
interface
Network, etc.
Fig. 2-2