Oki C831 Service Manual and Parts Catalog


Accurate and concise text, combined with detailed illustrations, lists of error code, instruction and diagrams, guide you through procedure of repair, remediate, maintenance and adjustments your copier, printer or scanner.
Present service manual and parts catalog Oki C831 contain clear instructions and procedures on how to fix the problems occurring in your equipment.
Format of the manual: PDF, makes it easy to navigate, instant download and print. English language.
Table of contents:

1. CONFIGURATION
1.1 System configuration
1.2 Printer configuration
1.3 Composition of optional items
1.4 Specifications
1.5 Interface specifications
1.5.1 USB interface specifications
1.5.1.1 USB interface overview
1.5.1.2 USB interface connectors and cables
1.5.1.3 USB interface signals
1.5.2 Network interface specifications
1.5.2.1 Network interface overview
1.5.2.2 Connector and cable of network interface
1.5.2.3 Network interface signals
1.5.3 Parallel interface specifications (only for models with a Centronics interface)
1.5.3.1 Parallel interface overview
1.5.3.2 Connector and cable of parallel interface
1.5.3.3 Parallel interface levels
1.5.4 ACC interface specifications
1.5.4.1 ACC interface overview
1.5.4.2 ACC interface connector and cable
1.5.4.3 ACC interface signals

2. DESCRIPTION OF OPERATION
2.1 Electrophotographic process mechanism
2.2 Printing process
2.3 Low-voltage Power Supply
2.3.1 Operation
2.3.2 Power-supply Voltage in Each Mode
2.3.3 Thermistor for Temperature Alarm
2.4 Top Cover Opening and Closing Detection Switch

3. INSTALLATION
3.1 Cautions, and do’s and don’ts
3.2 Unpacking procedure
3.3 Printer installation instructions
3.4 List of components and accessories
3.5 Assembly procedure
3.5.1 Assembly of the printer main unit
3.5.2 Connection of the AC cord
3.5.3 Installation and recognition confirmation of options
3.6 Printing of the configuration report
3.7 Connection methods
3.8 Checking of paper used by the user

4. REPLACEMENT OF PARTS
4.1 Notes on replacement of parts
4.2 Part replacement procedure
4.2.1 Belt unit
4.2.2 Fuser unit
4.2.3 Cover side-L
4.2.4 Cover side-R
4.2.5 Rear cover Assy
4.2.6 LED Assy
4.2.7 Main board Assy. (board Assy-MEL)
4.2.8 Top cover Assy
4.2.9 600dpi/1200dpi Cable-Assy-Head
4.2.10 Operator panel Assy
4.2.11 Front cove Assy
4.2.12 Guide Assy.-eject
4.2.13 Post-fuser-lock
4.2.14 Sensor Assy.-registration, relay board (P6Z), contact Assy., and fuser sensor Assy
4.2.15 High-voltage power supply board
4.2.16 Frame Assy.-Front
4.2.17 Roller Assy.-registration
4.2.18 Roller-feed, roller-pickup, frame Assy.-pickup, and holder sensor Assy
4.2.19 Low-voltage power supply Assy
4.2.20 Motor Assy.-belt and motor Assy-ID
4.2.21 Motor DC-FU (fuser motor)
4.2.22 Side-R Assy. and side-L Assy
4.2.22 Feed rollers (Tray 1/2/3/4)
4.2.24 Paper feed rollers (MPT pick-up roller/MPT feed roller/MPT retard roller)
4.2.25 Fuser Connector
4.2.26 Guide Assy.-Side-L/Rack-L
4.2.27 Guide Assy.-Side-R/Rack-R
4.2.28 Color Parts
4.2.29 Cover-FaceUP-B

5. LUBRICATION
5.1 Portions Lubricated

6. MAINTENANCE MENUS
6.1 System maintenance menu (For maintenance personnel)
6.2 Maintenance Utility
6.3 User maintenance menu functions
6.3.1 Maintenance menu (for end-users)
6.3.2 Self-diagnostic mode
6.3.2.1 Operator panel
6.3.2.2 Normal self-diagnostic mode (Level 1)
6.3.2.3 Switch scan test
6.3.2.4 Motor and clutch test
6.3.2.5 Test print
6.3.2.6 Color registration adjustment test
6.3.2.7 Density adjustment test
6.3.2.8 Consumable counter display
6.3.2.9 Print counter display
6.3.2.10 Factory-Shipping mode switching
6.3.2.11 Self-diagnostic function setting
6.3.2.12 LED head serial number display
6.3.2.13 Contrast adjustment
6.3.2.14 BUZZER TEST
6.3.3 Printing on stand-alone basis
6.3.4 Functions of buttons after power-on
6.4 Setup after part replacement
6.4.1 Notes on CU/ PU board replacement
6.5 Manual density adjustment setting
6.6 Boot Menu List

7. CLEANING
7.1 Cleaning
7.2 LED lens array cleaning
7.3 Paper feed roller cleaning

8. TROUBLESHOOTING PROCEDURE
8.1 Important notes to start the repair work
8.2 Matters to be checked before taking corrective actions against abnormalities
8.3 Precautions when taking corrective actions against abnormalities
8.4 Preparation for troubleshooting
8.5 Troubleshooting methods
8.5.1 LCD message list
8.5.2 Preparation for troubleshooting
8.5.2 (1) LCD display error
8.5.2.(2) Abnormal operations of the printer after the power is turned on
8.5.2.(3) Error 391: 1st Tray
8.5.2.(4) Error 380
8.5.2.(5) Error 390: MP Tray
8.5.2.(6) Error 381
8.5.2.(7) Error 382
8.5.2.(8) Errors 370, 371, 372, 373 and 383
8.5.2.(9) Errors 400 and 401
8.5.2.(10) Service call 142
8.5.2.(11) Errors 167 to 177
8.5.2.(12) Errors 122, 127, 128, 918 and 051
8.5.2.(13) Performance is low
8.5.2.(14) Option unit cannot be recognized
8.5.2.(15) Errors 131, 132, 133 and 134
8.5.2.(16) Errors 540, 541, 542 and 543
8.5.2.(17) Errors 154 and 155
8.5.2.(18) Error 123
8.5.2.(19) Wiring diagram
8.5.3 Troubleshooting the abnormal images
8.5.3.(1) Color has faded-out and blurred entirely (Refer to Figure 8-2 A.)
8.5.3.(2) Stain on white print. (Refer to Figure 8-2 B.)
8.5.3.(3) White print (Refer to Figure 8-2 C.)
8.5.3.(4) Black banding/black streaking in vertical direction
8.5.3.(5) Periodic abnormalities (Refer to Figure 8-2 E.)
8.5.3.(6) Significant color misregistration
8.5.3.(7) Solid black printing
8.5.3.(8) Getting only monochrome printing or no printing
8.5.4 Network troubleshooting
8.5.4.1 Connection error occurs with the Web browser
8.5.4.2 Print operation is not possible
8.5.4.3 Cannot create Certificate
8.5.4.4 Installation of Certificate is not possible
8.5.4.5 Other questions
8.5.4.6 Restrictions when using Internet Explore 7
8.6 Fuse check
8.7 Paper cassette switches and paper size correlation table

9. CONNECTION DIAGRAMS
9.1 Resistance value check
9.2 Parts location
9.3 F/W version number
9.3.1 Maintenance board indication stamp

& Parts Catalog.