Oki B721 Maintenance Manual

45487001TH Rev.1
iv /
Oki Data CONFIDENTIAL
CONTENTS
CONTENTS
1. Configuration .......................................................................1-1
1.1 System configuration ......................................................................................1-2
1.2 Printer configuration ........................................................................................1-3
1.3 Composition of optional items ......................................................................... 1-4
1.4 Specifications ................................................................................................... 1-5
1.5 Interface specifications ...................................................................................1-8
1.5.1 USB interface specifications ............................................................... 1-8
1.5.1.1 USB interface overview ......................................................1-8
1.5.1.2 USB interface connectors and cables ...............................1-8
1.5.1.3 USB interface signals .........................................................1-8
1.5.2 Network interface specifications .........................................................1-9
1.5.2.1 Network interface overview.................................................1-9
1.5.2.2 Network interface connector and cable .............................1-9
1.5.2.3 Network interface signals ..................................................1-9
1.5.3 USB host interface specifications .....................................................1-10
1.5.3.1 USB host interface overview ...........................................1-10
1.5.3.2 USB host interface connector ........................................... 1-10
1.5.3.3 USB host interface signals ...............................................1-10
1.5.4 WirelessLANinterfacespecications(WirelessModelonly) ............ 1-10
1.5.4.1 WirelessLANinterfaceoverview ......................................1-10
1.5.5 Parallel interface specifications (Parallel installed Model only) ..........1-11
1.5.5.1 Parallel interface overview ..............................................1-11
1.5.5.2 Parallel interface connector and cable ..............................1-11
1.5.5.3 Parallel interface signals ................................................... 1-11
1.5.5.4 Parallel interface levels ....................................................1-11
2. Installation ............................................................................ 2-1
2.1 Cautions, and do’s and don’ts .......................................................................... 2-2
2.2 Unpacking procedure ....................................................................................... 2-3
2.3 Printer installation instructions .........................................................................2-4
2.4 List of components and accessories ................................................................2-5
2.5 Assembly procedure ........................................................................................2-6
2.5.1 Assembly of the printer main unit ........................................................2-6
2.5.2 Connection of the AC cord ................................................................2-12
2.5.3 Installation and recognition confirmation of options ..........................2-14
2.6 Printing of the configuration report .................................................................2-28
2.7 Connection methods ......................................................................................2-29
2.8 Checking of paper used by the user ..............................................................2-39
3. Component replacement.....................................................3-1
3.1 Precautions on component replacement .........................................................3-2
3.2 Method of component replacement .................................................................3-4
3.2.1 Transfer roller ....................................................................................... 3-4
3.2.2 Fuser unit ............................................................................................3-5
3.2.3 Cover-Rear-Blind ................................................................................ 3-5
3.2.4 Cover side-L .......................................................................................3-6
3.2.5 Cover side-R ........................................................................................3-6
3.2.6 PU/CU-Board ......................................................................................3-7
3.2.6.1 PU/CU-Board......................................................................3-7
3.2.6.2 How to remove Battery(PU/CU-Board) ...............................3-8
3.2.7 Power supply unit ................................................................................3-9
3.2.8 DC motor (hop) / DC motor (ID) ..........................................................3-9
3.2.9 Motor FAN (PSU) ..............................................................................3-10
3.2.10 Motor FAN (ID) / Micro switch ........................................................... 3-10
3.2.11 HV-Board / Motor-FAN ......................................................................3-11
3.2.12 LED Assy ..........................................................................................3-11
3.2.13 Plate-Assy-Duct ................................................................................3-12
3.2.14 Frame-Assy-OP-Panel ......................................................................3-13
3.2.15 LCD panel .........................................................................................3-13
3.2.16 Cover-Assy-Front ..............................................................................3-14
3.2.17 Feeder-Assy-Regist / Clutch .............................................................3-15

Oki B721 Specifications

General

Print Technology	LED
Resolution	1200 x 1200 dpi
Processor	533 MHz
Memory	256 MB
Connectivity	USB, Ethernet
Duplex Printing	Standard