Oki S900 User manual

S900 Service Manual
031103A

S900
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Contents
1. INTRODUCTION ........................................................................................................................................... 1-1
1.1 GENERAL NOTES FOR SERVICING ............................................................................................. 1-1
1.2 GENERAL DESCRIPTION .......................................................................................................... 1-2
1.3 SPECIFICATIONS...................................................................................................................... 1-2
2. UNPACKING, INSTALLATION, AND TRANSPORTATION .................................................................. 2-1
2.1 PRECAUTIONS OF INSTALLATION .............................................................................................. 2-1
2.2 UNPACKING PROCEDURE......................................................................................................... 2-1
2.3 INSTALLATION ......................................................................................................................... 2-3
2.3.1 UNLOCKING THE SCAN UNIT ........................................................................................................... 2-3
2.3.2 CONNECTING THE IEEE 1394 CABLE .............................................................................................. 2-4
2.3.3 CONNECTING THE ADF CABLE (OPTIONAL) ........................................................................................ 2-4
2.3.4 SETTING UP THE OPTIONAL ADF (AUTO DOCUMENT FEEDER) ............................................................. 2-5
2.3.5 CONNECTING THE POWER AND TURNING ON THE MACHINE ................................................................ 2-5
2.4 PLACING THE ORIGINAL ............................................................................................................ 2-6
2.4.1 PLACING YOUR DOCUMENT(S) ON THE GLASS.................................................................................... 2-6
2.4.2 PLACING DOCUMENT(S) IN THE ADF .................................................................................................. 2-7
2.5 TRANSPORTATION ................................................................................................................... 2-8
3. PARTS IDENTIFICATION............................................................................................................................ 3-1
3.1 EXTERNAL VIEW ...................................................................................................................... 3-1
3.1.1 FRONT VIEW ................................................................................................................................. 3-1
3.1.2 REAR VIEW ................................................................................................................................... 3-2
4. THEORY OF OPERATION .......................................................................................................................... 4-1
INTRODUCTION............................................................................................................................... 4-1
4.1 INTRODUCTION......................................................................................................................... 4-1
4.2 MAIN CONTROL UNIT ................................................................................................................ 4-1
4.2.1 SYSTEM DIAGRAM.......................................................................................................................... 4-2
4.2.2 MAIN CONTROL CIRCUIT ................................................................................................................. 4-3
4.2.3 VIDEO CIRCUIT: ............................................................................................................................. 4-4
4.2.4 PANEL AND LCD MODULE CIRCUIT.................................................................................................... 4-6
4.2.5 SENSOR INPUT .............................................................................................................................. 4-7
4.2.6 SUB POWER SUPPLY CIRCUIT .......................................................................................................... 4-8
4.2.7 POWER SUPPLY............................................................................................................................. 4-9
5. TROUBLESHOOTING ................................................................................................................................. 5-1
5.1 TROUBLESHOOTING FLOWCHART ............................................................................................ 5-2
5.1.1 POWER ON TO S900 READY .......................................................................................................... 5-2
5.1.2 COPY OPERATION .......................................................................................................................... 5-3
5.1.3 CONTORL PANEL OPERATION .......................................................................................................... 5-4
5.2 TABLES .................................................................................................................................. 5-5
5.2.1 LCD DOES NOT DISPLAY ................................................................................................................ 5-6
5.2.2 PRINTER DOES NOT REACT ............................................................................................................. 5-6
5.2.3 SCANNING IS NOT PERFORMED ........................................................................................................ 5-7
5.2.4 PRINTER DOES NOT PRINT ............................................................................................................... 5-7
5.2.5 IMAGE UNCLEAR ............................................................................................................................ 5-8
5.2.6 NOISE GENERATED......................................................................................................................... 5-8
5.2.7 LCD DOES NOT SHOW MESSAGE AFTER COMMAND............................................................................ 5-9
5.2.8 S900 IS NOT CONNECTED TO THE NETWORK ................................................................................. 5-10
5.2.9 ERROR CODES IN LCD ................................................................................................................ 5-11
5.3 CLEARING THE PAPER JAM .................................................................................................... 5-13
6. PREVENTIVE MAINTENANCE................................................................................................................... 6-1
6.1 CLEANING THE DOCUMENT GLASS............................................................................................ 6-1

S900
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7. DISASSEMBLY ............................................................................................................................................. 7-1
7.1 SERVICE TOOLS ...................................................................................................................... 7-1
7.2 LUBRICANTS............................................................................................................................ 7-2
7.2.1 MECHANICAL UNIT LUBRICATION ..................................................................................................... 7-2
7.3 PROCEDURE FOR DISASSEMBLY AND REASSEMBLY................................................................... 7-4
7.3.1 NOTES ON DISASSEMBLY ................................................................................................................ 7-4
7.3.2 DOCUMENT COVER......................................................................................................................... 7-4
7.3.3 CONTROL PANEL ........................................................................................................................... 7-5
7.3.4 UPPER HOUSING ............................................................................................................................ 7-6
7.3.5 DOCUMENT COVER SENSOR PCBA ................................................................................................ 7-7
7.3.6 PAPER SENSOR PCBA..................................................................................................................... 7-8
7.3.7 MAIN CONTROL BOARD ASSEMBLY.................................................................................................. 7-9
7.3.8 MOTOR BELT ............................................................................................................................... 7-10
7.3.9 OPTICAL CHASSIS......................................................................................................................... 7-11
7.3.10 CCFL INVERTER PCBA ............................................................................................................ 7-13
7.3.11 LAMP ASSEMBLY ........................................................................................................................ 7-14
7.3.12 MOTOR UNIT .............................................................................................................................. 7-15
8. PARTS............................................................................................................................................................. 8-1
8.1 SPARE PARTS LIST................................................................................................................... 8-1

S900
1-1
1. INTRODUCTION
1.1 General Notes for Servicing
1.2 General Description
1.3 Specifications
This manual is intended to be used by maintenance engineers. It describes areas to be maintained, the
detailed installation, and the component replacement procedures as well as the main trouble shooting
guides.
Please take your time to read this manual thoroughly to obtain comprehensive knowledge about the S900
before serving the unit.
1.1 GENERAL NOTES FOR SERVICING
(1) Before trying to disassemble the S900, make sure the power supply cord of the S900 is
disconnected from the power outlet. Under any circumstance, do not remove from or install the
PWBs or connectors onto the S900 with the power switch turned ON.
(2) Use caution not to drop small parts or screws inside the unit when disassembling and
reassembling. If left inside, they might cause the malfunction of the unit.
(3) Do not pull the connector cable when disconnecting it. Hold the connector.
(4) When carrying PWBs or the scanning head unit, put it in an anti-static bag.
(5) Keep the document table glass surface always clean. If contaminated, use a dry clean cloth for
cleaning.
(6) Use caution not to injure your fingers or hands when disassembling or reassembling the unit.

S900
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1.2 GENERAL DESCRIPTION
The S900 provides you a fast and affordable access to color digital copying by simply connecting the
product to a color printer. This new way to make digital copies is cost effective, and it produces
dramatically better copies result than regular analog copiers. The S900 is also a high-quality scanner when
it is connected to a computer through a USB cable.
1.3 SPECIFICATIONS
General Specifications
Items Specifications
Model Type A3, Digital ScanCopier
System Features nUp to A3
nLocal copy executed by connecting to a OKI color printer
Output Quality 600 dpi, 24-bit color
Paper Size Up to A3
LCD 240*64 dot Graphic display
External Connection 1. IEEE 1394 (to connect to printer to make copies)
2. USB 2.0 (to connect to PC to scan)
3. RJ-45 (Network connection, to update printer profile and firmware)
4. ADF port (to connect to auto document feeder to copy or scan multi-page
documents)
CPU 64 MIPS CPU
Memory Size System: 128MB, Image buffer: 64 MB
ADF Capacity 50 pages
ADF Document
Weight/Thickness
14 – 28 lb. /0.002” – 0.006”
ADF Paper Feed Face Up
Flatbed Paper Feed Face Down
Power Requirement 24V DC, 2A external power adapter
Power Consumption <36 W (operating)
<24 W (standby)
<18 W (power saving)
Humidity 20% to 80%
Environment
Operation
Temperature
10°C to 35°C (50°F to 95°F)
Storage
Temperature
-10°C to 50°C (14°F to 122°F)
Dimension 589 x 502 x 318mm (23.2" x 19.75" x 12.5") (with ADF)
Weight 11.4 kg (25.1 lb) (with ADF)
MTBF 5,000 hours
MTTR 30 min
Life of Lamp 25,000 hours
Scanner Life 200,000 (flatbed) scans, or 5 years

S900
1-3
Copy Specification
Printer Language PCL
Connector Interface IEEE 1394 Cable
Copy Area 297 x 431 mm (11.19" x 16.97")
Multiple Copies Up to 99
Copy Mode Speed, FineText, Photo
Enlarge / Reduce Whole Page (93%)
25%~400% in 1% increment/decrement
Pre-set Scales
Copy Features Paper Size Auto Detection (A4 Landscape, A4
Portrait, A3)
Density Control
Copy Count up to 99
Media Type Plain Paper, Ultra-heavy, Transparency

S900
2-1
2. UNPACKING, INSTALLATION, AND
TRANSPORTATION
2.1 Precautions of Installation
2.2 Unpacking Procedure
2.3 Installation
2.4 Placing the Original
2.5 Transportation
2.1 PRECAUTIONS OF INSTALLATION
Pay attention to the following matters before unpacking and installation.
•Do not install in a place where vibration may occur.
•Keep the S900 out of direct sunlight. Do not install near a heat source.
•Do not place the S900 around materials that shut off the circulation of air.
•Do not install in a humid or dusty place.
•Use care not to scratch the glass surface of the S900 or the document holding pad with clips or
staples.
•Do not use a wall socket on the same circuit as devices that may generate noise, for example, an
air-conditioner, etc.
•Only use the DC adapter (model name ADP-50ZB made by Delta Electronics, Inc.) included with
the machine. Using other DC adapters may damage the machine and void the warranty.
•Use a suitable DC power source.
•Place the S900 on a level surface.
2.2 UNPACKING PROCEDURE
Unpack the S900 according to the following procedure.
•Remove the packing material.
•Remove the S900 from the shipping container.
•Remove the S900 from the PVC bag.
•Check the items against the following illustration.
•For any missing items, please contact the nearest dealer or distributor.
Note: Keep all the packing material in case you may need to return the S900.

S900
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1. Auto Document Feeder (optional) 5. IEEE1394 cable (for printer connection)
2. S900 main unit 6. Power adapter
3. USB cable (for computer
connection)
7. Cross cable
4. CD (service tool) 8. Power Cord (US, UK, Europe, Australia)
6
5
4
3
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