Oki MB290 Service Manual

PRINTER 3000 304 995 - 01
i
PRINTER MODEL-L1
           （
G191
）
SERVICE MANUAL
TECHNICAL DOCUMENT
i
TABLE OF CONTENTS
1. DETAILED SECTION DESCRIPTIONS.......................................1-1
1.1 COMPONENT LAYOUT.......................................................................... 1-1
1.1.1 MECHANICAL COMPONENTS...................................................... 1-1
1.2 PRINTING............................................................................................... 1-2
1.2.1 PRINTING PROCESSES AROUND THE DRUM............................ 1-2
1.2.2 CHARGE........................................................................................ 1-3
1.2.3 LASER EXPOSURE....................................................................... 1-4
Overview............................................................................................. 1-4
Block Diagram .................................................................................... 1-5
Error Conditions.................................................................................. 1-5
1.2.4 DEVELOPMENT............................................................................. 1-6
Overview............................................................................................. 1-6
Toner End Detection........................................................................... 1-8
1.2.5 TRANSFER AND SEPARATION.................................................... 1-9
Overview............................................................................................. 1-9
Cleaning Mode.................................................................................... 1-9
1.2.6 DRUM CLEANING........................................................................ 1-10
1.2.7 PAPER FEED AND REGISTRATION........................................... 1-11
Overview........................................................................................... 1-11
Paper Feed Drive Mechanism........................................................... 1-12
Paper Feed Operation ...................................................................... 1-13
Registration ...................................................................................... 1-14
Paper End Detection......................................................................... 1-15
Jam Detection................................................................................... 1-16
1.2.8 FUSING........................................................................................ 1-17
Overview........................................................................................... 1-17
Power Save Control.......................................................................... 1-18
1.2.9 COVER SWITCH.......................................................................... 1-19
1.2.10 PAPER FEED DRIVE RELEASE AND FUSING
DRIVE RELEASE .................................................................... 1-20
2. REPLACEMENT AND ADJUSTMENT........................................2-1
2.1 PAPER CASSETTE ................................................................................ 2-2
2.1.1 PAPER CASSETTE........................................................................ 2-2
Side Fence ......................................................................................... 2-2
Bottom Plate....................................................................................... 2-3
Friction Pad ........................................................................................ 2-3
2.2 LASER UNIT........................................................................................... 2-4
2.3 FUSING AREA........................................................................................ 2-6
2.3.1 FUSING UNIT................................................................................. 2-6
2.3.2 PAPER EXIT ASSEMBLY .............................................................. 2-7
2.3.3 FUSING LAMP AND HOT ROLLER ............................................... 2-8
Fusing Lamp....................................................................................... 2-8
Hot Roller............................................................................................ 2-9
2.3.4 PRESSURE ROLLER................................................................... 2-10

Oki MB290 Specifications

General

Brand	Oki
Model	MB290
Category	All in One Printer
Language	English