Oki MC160MFP User manual

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MC160MFP
Maintenance Manual
011710A
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Copyright Information
Copyright © 2009by Oki Data. All Rights Reserved
Disclaimer
Every effort has been made to ensure that the information in this document is complete, accurate, and up-to-
date. The manufacturer assumes no responsibility for the results of errors beyond its control. The
manufacturer also cannot guarantee that changes in software and equipment made by other manufacturers and
referred to in this guide will not affect the applicability of the information in it. Mention of software products
manufactured by other companies does not necessarily constitute endorsement by the manufacturer.
While all reasonable efforts have been made to make this document as accurate and helpful as possible, we
make no warranty of any kind, expressed or implied, as to the accuracy or completeness of the information
contained herein.
The most up-to-date drivers and manuals are available from the web site:
http://www.okiprintingsolutions.com

44292401TH Rev.1 2 /
Oki Data CONFIDENTIAL
Document Revision History
Rev.
No Date Corrected items Person in charge
No. Page Description of change
1 2009-07-03 Issue PED1 K. Aida
Rev.
No Date Corrected items Person in charge
No. Page Description of change
DOCUMENT REVISION HISTORY

44292401TH Rev.1 3 /
Oki Data CONFIDENTIAL
This manual provides an overview of method for maintaining the MC160n.
This manual is intended for maintenance staff.For more information about how to operate
the MC160n, please refer to User 's manual.
Note! • Manual may be revised and updated at any time without notice.
• Unexpected mistakes may exist in the manual.
OKI will not assume any responsibility whatsoever for damage to the
equipmentrepaired/adjusted/changed by the user etc with this manual.
• The parts used for this printer may be damaged when handling
inappropriately.We strongly recommend maintaining this machine by our
registration maintenance staff.
• Please operate the machine after removing static electricity.
PREFACE
PREFACE

44292401TH Rev.1 4 /
Oki Data CONFIDENTIAL
CONTENTS
CONTENTS
SAFETY AND IMPORTANT WARNING ITEMS ................................................5
IMPORTANT NOTICE..................................................................................................... 5
DESCRIPTION ITEMS FOR DANGER, WARNING AND CAUTION.............................. 5
SAFETY WARNINGS..................................................................................................... 5
SAFETYINFORMATION .................................................................................13
IMPORTANT NOTICE................................................................................................... 13
INDICATION OFWARNING ON THE MACHINE......................................................... 14
MEASURES TO TAKE IN CASE OF AN ACCIDENT........................................15
Composition of the service manual...................................................................16
Notation of the service manual..........................................................................16
MC160n Main body THEORY OF OPERATION
OUTLINE...................................................................................................................... 20
COMPOSITION/OPERATION...................................................................................... 23
Auto document feeder unit THEORY OF OPERATION
OUTLINE...................................................................................................................... 56
COMPOSITION/OPERATION...................................................................................... 57
MC160n Main body FIELD SERVICE
OUTLINE...................................................................................................................... 67
MAINTENANCE ........................................................................................................... 69
ADJUSTMENT/SETTING............................................................................................. 96
TROUBLESHOOTING................................................................................................ 178
APPENDIX ................................................................................................................. 202
MC160n OVERALL WIRING DIAGRAM.............................................................206

44292401TH Rev.1 5 /
Oki Data CONFIDENTIAL SAFETYAND IMPORTANT WARNING ITEMS
Read carefully the Safety and Important Warning Items described below to understand
them before doing service work.
Because of possible hazards to an inexperienced person servicing this product as well as
the risk of damage to the product, Okidata Corporation (hereafter called the ODC)
strongly recommends that all servicing be performed only by ODC-trained service
technicians.
Changes may have been made to this product to improve its performance after this Service
Manual was printed. Accordingly, ODC does not warrant, either explicitly or implicitly, that
the information contained in this Service Manual is complete and accurate.
The user of this Service Manual must assume all risks of personal injury and/or damage to
the product while servicing the product for which this Service Manual is intended.
Therefore, this Service Manual must be carefully read before doing service work both in the
course of technical training and even after that, for performing maintenance and control of
the product properly.
Keep this Service Manual also for future service.
In this Service Manual, each of three expressions " DANGER", " WARNING", and
"CAUTION" is defined as follows together with a symbol mark to be used in a limited
meaning.
When servicing the product, the relevant works (disassembling, reassembling, adjustment,
repair, maintenance, etc.) need to be conducted with utmost care.
Symbols used for safety and important warning items are defined as follows:
SAFETY AND IMPORTANT WARNING ITEMS
IMPORTANT NOTICE
DESCRIPTION ITEMS FOR DANGER,
WARNING AND CAUTION
DANGER: Action having a high possibility of suffering death or serious injury
WARNING: Action having a possibility of suffering death or serious injury
CAUTION: Action having a possibility of suffering a slight wound, medium
trouble and property damage
:Precaution when using the
copier. General
precaution Electric hazard High
temperature
:Prohibition when using the
copier. General
prohibition Do not touch with wet hand Do not disassemble
:Direction when using the
copier. General
instruction Unplug Ground/Earth
[1] MODIFICATIONSNOT AUTHORIZED BY OKI DATA CORPORATION
Okidata brand products are renowned for their high reliability. This reliability is achieved
through high-quality design and a solid service network.
Product design is a highly complicated and delicate process where numerous mechanical,
physical, and electrical aspects have to be taken into consideration, with the aim of arriving
at proper tolerances and safety factors. For this reason, unauthorized modifications involve
a high risk of degradation in performance and safety. Such modifications are therefore
strictly prohibited. The points listed below are not exhaustive, but they illustrate the reason-
ing behind this policy.
SAFETY WARNINGS
Prohibited Actions
DANGER
• Using any cables or power cord not specified by ODC.
• Using any fuse or thermostat not specified by ODC.
Safety will not be assured, leading to a risk of fire and
injury.
• Disabling fuse functions or bridging fuse terminals with
wire, metal clips, solder or similar object.
• Disabling relay functions (such as wedging paper between
relay contacts)
• Disabling safety functions (interlocks, safety circuits, etc.)
Safety will not be assured, leading to a risk of fire and
injury.
• Making any modification to the product unless instructed
by ODC
• Using parts not specified by ODC
SAFETY AND IMPORTANT WARNING ITEMS
IMPORTANT NOTICE
SAFETYWARNINGS
DESCRIPTION ITEMS FOR DANGER,
WARNING AND CAUTION
[1] MODIFICATIONSNOT AUTHORIZED BY OKI DATA CORPORATION
Okidata brand products are renowned for their high reliability. This reliability is achieved
through high-quality design and a solid service network.
Product design is a highly complicated and delicate process where numerous mechanical,
physical, and electrical aspects have to be taken into consideration, with the aim of arriving
at proper tolerances and safety factors. For this reason, unauthorized modifications involve
a high risk of degradation in performance and safety. Such modifications are therefore
strictly prohibited. The points listed below are not exhaustive, but they illustrate the reason-
ing behind this policy.
SAFETY WARNINGS
Prohibited Actions
DANGER
• Using any cables or power cord not specified by ODC.
• Using any fuse or thermostat not specified by ODC.
Safety will not be assured, leading to a risk of fire and
injury.
• Disabling fuse functions or bridging fuse terminals with
wire, metal clips, solder or similar object.
• Disabling relay functions (such as wedging paper between
relay contacts)
• Disabling safety functions (interlocks, safety circuits, etc.)
Safety will not be assured, leading to a risk of fire and
injury.
• Making any modification to the product unless instructed
by ODC
• Using parts not specified by ODC

44292401TH Rev.1 6 /
Oki Data CONFIDENTIAL SAFETYAND IMPORTANT WARNING ITEMS
[2] POWER PLUG SELECTION
In some countries or areas, the power plug provided with the product may not fit wall outlet
used in the area. In that case, it is obligation of customer engineer (hereafter called the CE)
to attach appropriate power plug or power cord set in order to connect the product to the
supply.
Power Cord Set or Power Plug
WARNING
• Use power supply cord set which meets the following
criteria:
- provided with a plug having configuration intended for
the connection to wall outlet appropriate for the prod-
uct's rated voltage and current, and
- the plug has pin/terminal(s) for grounding, and
- provided with three-conductor cable having enough cur-
rent capacity, and
- the cord set meets regulatory requirements for the area.
Use of inadequate cord set leads to fire or electric shock.
• Attach power plug which meets the following criteria:
- having configuration intended for the connection to wall
outlet appropriate for the product's rated voltage and
current, and
- the plug has pin/terminal(s) for grounding, and
- meets regulatory requirements for the area.
Use of inadequate cord set leads to the product connect-
ing to inadequate power supply (voltage, current capacity,
grounding), and may result in fire or electric shock.
• Conductors in the power cable must be connected to ter-
minals of the plug according to the following order:
• Black or Brown: L (line)
• White or Light Blue: N(neutral)
• Green/Yellow: PE (earth)
Wrong connection may cancel safeguards within the
product, and results in fire or electric shock.
AC230V
AC208V 240V
[3] CHECKPOINTS WHENPERFORMING ON-SITE SERVICE
Okidata brand products are extensively tested before shipping, to ensure that all
applicable safety standards are met, in order to protect the customer and CE from the risk
of injury. However, in daily use, any electrical equipment may be subject to parts wear and
eventual failure. In order to maintain safety and reliability, the CE must perform regular
safety checks.
1. Power Supply
Connection to Power Supply
WARNING
• Check that mains voltage is as specified.
Connection to wrong voltage supply may result in fire or
electric shock.
• Connect power plug directly into wall outlet having same
configuration as the plug.
Use of an adapter leads to the product connecting to
inadequate power supply (voltage, current capacity,
grounding), and may result in fire or electric shock.
If proper wall outlet is not available, advice the customer
to contact qualified electrician for the installation.
• Plug the power cord into the dedicated wall outlet with a
capacity greater than the maximum power consumption.
If excessive current flows in the wall outlet, fire may
result.
• If two or more power cords can be plugged into the wall
outlet, the total load must not exceed the rating of the wall
outlet.
If excessive current flows in the wall outlet, fire may
result.
• Make sure the power cord is plugged in the wall outlet
securely.
Contact problems may lead to increased resistance,
overheating, and the risk of fire.
? V
kw

44292401TH Rev.1 7 /
Oki Data CONFIDENTIAL SAFETYAND IMPORTANT WARNING ITEMS
• Check whether the product is grounded properly.
If current leakage occurs in an ungrounded product, you
may suffer electric shock while operating the product.
Connect power plug to grounded wall outlet.
Connection to Power Supply
WARNING
Power Plug and Cord
WARNING
• When using the power cord set (inlet type) that came with
this product, make sure the connector is securely inserted
in the inlet of the product.
When securing measure is provided, secure the cord with
the fixture properly.
If the power cord (inlet type) is not connected to the prod-
uct securely, a contact problem may lead to increased
resistance, overheating, and risk of fire.
• Check whether the power cord is not stepped on or
pinched by a table and so on.
Overheating may occur there, leading to a risk of fire.
• Check whether the power cord is damaged. Check
whether the sheath is damaged.
If the power plug, cord, or sheath is damaged, replace
with a new power cord or cord set (with plug and connec-
tor on each end) specified by ODC.
Using the damaged power cord may result in fire or elec-
tric shock.
• Do not bundle or tie the power cord.
Overheating may occur there, leading to a risk of fire.
• Check whether dust is collected around the power plug
and wall outlet.
Using the power plug and wall outlet without removing
dust may result in fire.
• Do not insert the power plug into the wall outlet with a wet
hand.
The risk of electric shock exists.
• When unplugging the power cord, grasp the plug, not the
cable.
The cable may be broken, leading to a risk of fire and
electric shock.
Power Plug and Cord
WARNING
Wiring
WARNING
•Never use multi-plug adapters to plug multiple power cords
in the same outlet.
If used, the risk of fire exists.
• When an extension cord is required, use a specified one.
Current that can flow in the extension cord is limited, so
using a too long extension cord may result in fire.
Do not use an extension cable reel with the cable taken
up. Fire may result.

44292401TH Rev.1 8 /
Oki Data CONFIDENTIAL SAFETYAND IMPORTANT WARNING ITEMS
2. Installation Requirements
Prohibited Installation Places
WARNING
• Do not place the product near flammable materials or vola-
tile materials that may catch fire.
A risk of fire exists.
• Do not place the product in a place exposed to water such
as rain.
A risk of fire and electric shock exists.
When not Using the Product for a long time
WARNING
• When the product is not used over an extended period of
time (holidays, etc.), switch it off and unplug the power
cord.
Dust collected around the power plug and outlet may
cause fire.
Ventilation
CAUTION
• The product generates ozone gas during operation, but it
will not be harmful to the human body.
If a bad smell of ozone is present in the following cases,
ventilate the room.
a. When the product is used in a poorly ventilated room
b. When taking a lot of copies
c. When using multiple products at the same time
Fixing
CAUTION
• Be sure to lock the caster stoppers.
In the case of an earthquake and so on, the product may
slide, leading to a injury.
3. Servicing
Inspection before Servicing
CAUTION
• Before conducting an inspection, read all relevant docu-
mentation (service manual, technical notices, etc.) and
proceed with the inspection following the prescribed pro-
cedure in safety clothes, using only the prescribed tools.
Do not make any adjustment not described in the docu-
mentation.
If the prescribed procedure or tool is not used, the prod-
uct may break and a risk of injury or fire exists.
• Before conducting an inspection, be sure to disconnect
the power plugs from the product and options.
When the power plug is inserted in the wall outlet, some
units are still powered even if the POWER switch is
turned OFF. Arisk of electric shock exists.
• The area around the fixing unit is hot.
You may get burnt.
Work Performed with the Product Powered On
WARNING
• Take every care when making adjustments or performing
an operation check with the product powered.
If you make adjustments or perform an operation check
with the external cover detached, you may touch live or
high-voltage parts or you may be caught in moving gears
or the timing belt, leading to a risk of injury.
• Take every care when servicing with the external cover
detached.
High-voltage exists around the drum unit. A risk of elec-
tric shock exists.

44292401TH Rev.1 9 /
Oki Data CONFIDENTIAL SAFETYAND IMPORTANT WARNING ITEMS
Safety Checkpoints
WARNING
• When taking a report of problems from a user, check each
part and repair properly.
A risk of product trouble, injury, and fire exists.
• Check the exterior and frame for edges, burrs, and other
damages.
The user or CE may be injured.
• Do not allow any metal parts such as clips, staples, and
screws to fall into the product.
They can short internal circuits and cause electric shock
or fire.
• Check wiring for squeezing and any other damage.
Current can leak, leading to a risk of electric shock or
fire.
• Carefully remove all toner remnants and dust from electri-
cal parts and electrode units such as a charging corona
unit.
Current can leak, leading to a risk of product trouble or
fire.
• Check high-voltage cables and sheaths for any damage.
Current can leak, leading to a risk of electric shock or
fire.
• Check electrode units such as a charging corona unit for
deterioration and sign of leakage.
Current can leak, leading to a risk of trouble or fire.
• Before disassembling or adjusting the write unit (P/H unit)
incorporating a laser, make sure that the power cord has
been disconnected.
The laser light can enter your eye, leading to a risk of
loss of eyesight.
• Do not remove the cover of the write unit. Do not supply
power with the write unit shifted from the specified mount-
ing position.
The laser light can enter your eye, leading to a risk of
loss of eyesight.
• When replacing a lithium battery, replace it with a new lith-
ium battery specified in the Parts Guide Manual. Dispose
of the used lithium battery using the method specified by
local authority.
Improper replacement can cause explosion.
• After replacing a part to which AC voltage is applied (e.g.,
optical lamp and fixing lamp), be sure to check the installa-
tion state.
A risk of fire exists.
• Check the interlock switch and actuator for loosening and
check whether the interlock functions properly.
If the interlock does not function, you may receive an
electric shock or be injured when you insert your hand in
the product (e.g., for clearing paper jam).
• Make sure the wiring cannot come into contact with sharp
edges, burrs, or other pointed parts.
Current can leak, leading to a risk of electric shock or
fire.
• Make sure that all screws, components, wiring, connec-
tors, etc. that were removed for safety check and mainte-
nance have been reinstalled in the original location. (Pay
special attention to forgotten connectors, pinched cables,
forgotten screws, etc.)
A risk of product trouble, electric shock, and fire exists.
Safety Checkpoints
WARNING

44292401TH Rev.1 10 /
Oki Data CONFIDENTIAL SAFETYAND IMPORTANT WARNING ITEMS
Handling of Consumables
WARNING
• Toner and developer are not harmful substances, but care
must be taken not to breathe excessive amounts or let the
substances come into contact with eyes, etc. It may be
stimulative.
If the substances get in the eye, rinse with plenty of water
immediately. When symptoms are noticeable, consult a
physician.
•Never throw the used cartridge and toner into fire.
You may be burned due to dust explosion.
Handling of Service Materials
CAUTION
• Unplug the power cord from the wall outlet.
Isopropyl alcohol and acetone are highly flammable and
must be handled with care. A risk of fire exists.
• Do not replace the cover or turn the product ON before
any solvent remnants on the cleaned parts have fully
evaporated.
A risk of fire exists.
• Use only a small amount of cleaner at a time and take
care not to spill any liquid. If this happens, immediately
wipe it off.
A risk of fire exists.
• When using any solvent, ventilate the room well.
Breathing large quantities of organic solvents can lead to
discomfort.
4. Fuse
5. Used Batteries Precautions
Fuse
CAUTION
• CAUTION
Double pole / neutral fusing
• ATTENTION
Double pôle / Fusible sur le neutre
Handling of batteries
CAUTION
• ALL Areas CAUTION
Danger of explosion if battery is incorrectly replaced.
Replace only with the same or equivalent type recommended by the manufacturer.
Dispose of used batteries according to the manufacturer’s instructions.
• Germany VORSICHT!
Explosionsgefahr bei unsachgemäßem Austausch der Batterie.
Ersatz nur durch denselben oder einen vom Hersteller empfohlenen gleichwertigen Typ.
Entsorgung gebrauchter Batterien nach Angaben des Herstellers.
• France ATTENTION
Il y a danger d’explosion s’il y a remplacement incorrect de la batterie.
Remplacer uniquement avec une batterie du même type ou d’un type équivalent recom-
mandé par le constructeur.
Mettre au rebut les batteries usagées conformément aux instructions du fabricant.
• Denmark ADVARSEL!
Lithiumbatteri - Eksplosionsfare ved fejlagtig håndtering.
Udskiftning må kun ske med batteri af samme fabrikat og type.
Levér det brugte batteri tilbage til leverandøren.
• Finland, Sweden VAROlTUS
Paristo voi räjähtää, jos se on virheellisesti asennettu.
Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin.
Hävitä käytetty paristo valmistajan ohjeiden mukaisesti.
VARNING
Explosionsfara vid felaktigt batteribyte.
Använd samma batterityp eller en ekvivalent typ som rekommenderas av apparat-
tillverkaren.
Kassera använt batteri enligt fabrikantens instruktion.
•Norway ADVARSEL
Eksplosjonsfare ved feilaktig skifte av batteri.
Benytt samme batteritype eller en tilsvarende type anbefalt av apparatfabrikanten.
Brukte batterier kasseres i henhold til fabrikantens instruksjoner.

44292401TH Rev.1 11 /
Oki Data CONFIDENTIAL SAFETYAND IMPORTANT WARNING ITEMS
[4] LASER SAFETY
• This is a digital machine certified as a Class 1 laser product. There is no possibility of
danger from a laser, provided the machine is serviced according to the instruction in this
manual.
4.1 Internal Laser Radiation
*at laser aperture of the Print Head Unit
• This product employs a Class 3B laser diode that emits an invisible laser beam. The
laser diode and the scanning polygon mirror are incorporated in the print head unit.
• The print head unit is NOT A FIELD SERVICEABLE ITEM. Therefore, the print head unit
should not be opened under any circumstances.
semiconductor laser
Maximum power of the laser diode 20 mW
Maximum average radiation power (*) 13.3 µW
Wavelength 775 - 800 nm
A0HFP0C502DA
M
Laser Aperture of
the Print Head Unit
U.S.A., Canada
(CDRH Regulation)
• This machine is certified as a Class 1 Laser product under Radiation Performance Stan-
dard according to the Food, Drug and Cosmetic Act of 1990. Compliance is mandatory
for Laser products marketed in the United States and is reported to the Center for
Devices and Radiological Health (CDRH) of the U.S. Food and Drug Administration of
the U.S. Department of Health and Human Services (DHHS). This means that the device
does not produce hazardous laser radiation.
• The label shown on page S-16 indicates compliance with the CDRH regulations and
must be attached to laser products marketed in the United States.
.
All Areas
Denmark
CAUTION
• Use of controls, adjustments or performance of procedures other than those
specified in this manual may result in hazardous radiation exposure.
semiconductor laser
Maximum power of the laser diode 20 mW
Wavelength 775 - 800 nm
CAUTION
• Use of controls, adjustments or performance of procedures other than those
specified in this manual may result in hazardous radiation exposure.
semiconductor laser
Maximum power of the laser diode 20 mW
Wavelength 775 - 800 nm
ADVARSEL
• Usynlig laserstråling ved åbning, når sikkerhedsafbrydere er ude af funktion.
Undgå udsættelse for stråling. Klasse 1 laser produkt der opfylder IEC60825-1
sikkerheds kravene.
halvlederlaser
Laserdiodens højeste styrke 20 mW
bølgelængden 775 - 800 nm

44292401TH Rev.1 12 /
Oki Data CONFIDENTIAL SAFETYAND IMPORTANT WARNING ITEMS
Finland, Sweden
Norway
LUOKAN 1 LASERLAITE
KLASS 1 LASER APPARAT
VAROITUS!
• Laitteen käyttäminen muulla kuin tässä käyttöohjeessa mainitulla tavalla saat-
taa altistaa käyttäjän turvallisuusluokan 1 ylittävälle näkymättömälle laser-
säteilylle.
puolijohdelaser
Laserdiodin suurin teho 20 mW
aallonpituus 775 - 800 nm
VARNING!
• Om apparaten används på annat sätt än i denna bruksanvisning specificerats,
kan användaren utsättas för osynlig laserstrålning, som överskrider gränsen för
laserklass 1.
halvledarlaser
Den maximala effekten för laserdioden 20 mW
våglängden 775 - 800 nm
VARO!
• Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättomälle laser-
säteilylle. Älä katso säteeseen.
VARNING!
• Osynlig laserstråining när denna del är öppnad och spärren är urkopplad.
Betrakta ej stråien.
ADVERSEL
• Dersom apparatet brukes på annen måte enn spesifisert i denne bruksanvisn-
ing, kan brukeren utsettes för unsynlig laserstrålning, som overskrider grensen
for laser klass 1.
halvleder laser
Maksimal effekt till laserdiode 20 mW
bølgelengde 775 - 800 nm
4.2 Laser Safety Label
• A laser safety label is attached to the inside of the machine as shown below.
M
A0HFP0C500DA

44292401TH Rev.1 13 /
Oki Data CONFIDENTIAL SAFETYINFORMATION
The Center for Devices and Radiological Health (CDRH) of the U.S. Food and Drug Admin-
istration implemented regulations for laser products manufactured since August 1, 1976.
Compliance is mandatory for products marketed in the United States.
This copier is certified as a "Class 1" laser product under the U.S.
Department of Health and Human Services (DHHS) Radiation Performance Standard
according to the Radiation Control for Health and Safety Act of 1968. Since radiation emit-
ted inside this copier is completely confined within protective housings and external covers,
the laser beam cannot escape during any phase of normal user operation.
SAFETY INFORMATION
IMPORTANT NOTICE
4.3 Laser Caution Label
• A laser caution label is attached to the outside of the machine as shown below.
4.4 PRECAUTIONS FOR HANDLING THE LASER EQUIPMENT
• When laser protective goggles are to be used, select ones with a lens conforming to the
above specifications.
• When a disassembly job needs to be performed in the laser beam path, such as when
working around the printerhead and PC Drum, be sure first to turn the printer OFF.
• If the job requires that the printer be left ON, take off your watch and ring and wear laser
protective goggles.
• A highly reflective tool can be dangerous if it is brought into the laser beam path. Use
utmost care when handling tools on the user’s premises.
• The Print Head is not to be disassembled or adjusted in the field. Replace the Unit or
Assembly including the Control Board. Therefore, remove the Laser Diode, and do not
perform Control Board trimmer adjustment.
M
A0HFP0C501DA
SAFETY INFORMATION
IMPORTANT NOTICE

44292401TH Rev.1 14 /
Oki Data CONFIDENTIAL SAFETYINFORMATION
Caution labels shown below are attached in some areas on/in the machine.
When accessing these areas for maintenance, repair, or adjustment, special care should
be taken to avoid burns and electric shock.
INDICATION OF WARNING ON THE MACHINE
M
A0HFP0503DA
High voltage
• This area generates high
voltage.
Be careful not to touch here
when the power is turned
ON to avoid getting an elec-
tric shock.
CAUTION
• The area around the Fuser
Unit is extremely hot.
Touching any part other
than those indicated may
result in burns.
A0HFP0C504DA
High voltage
• This area generates high
voltage.
Be careful not to touch here
when the power is turned
ON to avoid getting an elec-
tric shock.
INDICATION OFWARNING ONTHE MACHINE

44292401TH Rev.1 15 /
Oki Data CONFIDENTIAL MEASURES TO TAKE IN CASE OF AN ACCIDENT
CAUTION:
A0HFP0505DA
WARNING
• Do not burn used Imaging Cartridge.
Toner expelled from the fire is dangerous.
WARNING
• Do not burn used Toner Cartridges.
Toner expelled from the fire is dangerous.
• You may be burned or injured if you touch any area that you are advised by any
caution label to keep yourself away from. Do not remove caution labels. And also,
when the caution label is peeled off or soiled and cannot be seen clearly, replace
it with a new caution label.
1. If an accident has occurred, the distributor who has been notified first must immediately
take emergency measures to provide relief to affected persons and to prevent further
damage.
2. If a report of a serious accident has been received from a customer, an on-site evalua-
tion must be carried out quickly and ODC must be notified.
3. To determine the cause of the accident, conditions and materials must be recorded
through direct on-site checks, in accordance with instructions issued by ODC.
4. For reports and measures concerning serious accidents, follow the regulations speci-
fied by every distributor.
MEASURES TO TAKE IN CASE OF
AN ACCIDENT
MEASURESTOTAKE IN CASE OF
AN ACCIDENT
MADE IN JAPAN
TYPE-D1 L/N PK01D8304A
Standard Capacity
TS1
C110/C130n
MC160n

44292401TH Rev.1 16 /
Oki Data CONFIDENTIAL MEASURES TO TAKE IN CASE OF AN ACCIDENT
Composition of the service manual
This service manual consists of Theory of Operation section and Field Service section to
explain the main machine and its corresponding options.
Theory of Operation section gives, as information for the CE to get a full understanding of
the product, a rough outline of the object and role of each function, the relationship
between the electrical system and the mechanical system, and the timing of operation of
each part.
Field Service section gives, as information required by the CE at the site (or at the cus-
tomer’s premise), a rough outline of the service schedule and its details, maintenance
steps, the object and role of each adjustment, error codes and supplementary information.
The basic configuration of each section is as follows. However some options may not be
applied to the following configuration.
<Theory of Operation section>
<Field service section>
OUTLINE: Explanation of system configuration,
product specifications, unit configuration, and paper path
COMPOSITION/OPERATION: Explanation of configuration of each unit,
operating system, and control system
OUTLINE: Explanation of system configuration, and product
specifications
MAINTENANCE: Explanation of service schedule, maintenance steps, ser-
vice tools, removal/reinstallation methods of major parts,
and firmware version up method etc.
ADJUSTMENT/SETTING: Explanation of utility mode, service mode, and mechanical
adjustment etc.
TROUBLESHOOTING: Explanation of lists of jam codes and error codes, and
their countermeasures etc.
APPENDIX: Parts layout drawings, connector layout drawings, timing
chart, overall layout drawing are attached.
Notation of the service manual
A. Product name
In this manual, each of the products is described as follows:
B. Brand name
The company names and product names mentioned in this manual are the brand name or
the registered trademark of each company.
C. Feeding direction
• When the long side of the paper is parallel with the feeding direction, it is called short
edge feeding. The feeding direction which is perpendicular to the short edge feeding is
called the long edge feeding.
• Short edge feeding will be identified with [S (abbreviation for Short edge feeding)] on the
paper size. No specific notation is added for the long edge feeding.
When the size has only the short edge feeding with no long edge feeding, [S] will not be
added to the paper size.
<Sample notation>
(1) MC160n Main body
(2) Microsoft Windows NT 4.0:Windows NT 4.0 or Windows NT
Microsoft Windows 2000: Windows 2000
Microsoft Windows XP: Windows XP
Microsoft Windows Vista: Windows Vista
When the description is made in combination of the OS’s mentioned above:
Windows NT 4.0/2000
Windows NT/2000/XP/Vista
Paper size Feeding direction Notation
A4 Long edge feeding A4
Short edge feeding A4S
A3 Short edge feeding A3
Notation of the service manualComposition of the service manual

44292401TH Rev.1 17 /
Oki Data CONFIDENTIAL
MC160n Main body
THEORY OF OPERATION

44292401TH Rev.1 18 /
Oki Data CONFIDENTIAL
CONTENTS
MC160n Main body
OUTLINE...........................................................................20
1. System configuration .........................................................................................20
2. Product specifications........................................................................................20
3. Center cross section..........................................................................................22
4. Media path..........................................................................................................22
COMPOSITION/OPERATION...........................................23
5. Overall composition ...........................................................................................23
5.1 Control block diagram .....................................................................................23
5.2 Image creation process...................................................................................23
5.3 Operation sequence........................................................................................24
6. Interface section.................................................................................................24
6.1 Composition.....................................................................................................24
7. Scanner section.................................................................................................25
7.1 Composition.....................................................................................................25
7.2 Drive.................................................................................................................25
7.3 Operation.........................................................................................................26
7.3.1 When the Start key is pressed..................................................................26
7.3.2 Home position detection...........................................................................26
7.3.3 Shading compensation.............................................................................26
8. Write section (PH section).................................................................................27
8.1 Composition.....................................................................................................27
8.2 Operation.........................................................................................................27
8.2.1 Outline......................................................................................................27
8.2.2 Laser exposure process ...........................................................................27
8.2.3 Laser emission area.................................................................................28
8.2.4 Image stabilization control item................................................................28
9. Imageing cartridge section................................................................................28
9.1 Composition.....................................................................................................28
9.2 Drive.................................................................................................................29
9.3 Operation.........................................................................................................29
9.3.1 Imaging cartridge (IC) life control.............................................................29
10. Photo conductor section....................................................................................29
10.1 Composition.....................................................................................................29
10.2 Drive.................................................................................................................29
10.3 Operation.........................................................................................................30
10.3.1 Photo conductor drive mechanism...........................................................30
10.3.2 Photo conductor cleaning mechanism......................................................30
11. Charge corona section.......................................................................................30
11.1 Composition.....................................................................................................30
11.2 Operation.........................................................................................................30
11.2.1 Charge corona control..............................................................................30
12. Developing section.............................................................................................31
12.1 Composition.....................................................................................................31
12.2 Drive.................................................................................................................31
12.3 Operation.........................................................................................................31
12.3.1 Toner flow .................................................................................................31
12.3.2 Toner Cartridge Rack ...............................................................................32
12.3.3 Developing Roller drive.............................................................................35
12.3.4 Developing bias........................................................................................35
12.3.5 Developing system ...................................................................................35
12.3.6 Toner cartridge (TC) life control................................................................35
12.3.7 Image refresh mode .................................................................................36
13. 1st transfer section.............................................................................................36
13.1 Composition.....................................................................................................36
13.2 Drive.................................................................................................................37
13.3 Operation.........................................................................................................37
13.3.1 1st transfer output control.........................................................................37
13.3.2 Transfer belt cleaning mechanism............................................................37
13.3.3 Cleaning blade pressure/retraction mechanism.......................................38
13.3.4 Belt Positioning Sensor ............................................................................39
13.3.5 ATVC (Auto transfer voltage control)........................................................40
13.3.6 Image stabilization control item................................................................40
14. 2nd transfer section/ media separation............................................................. 41
14.1 Composition..................................................................................................... 41
14.2 Drive................................................................................................................. 41
14.3 Operation.........................................................................................................42
14.3.1 2nd transfer roller pressure/retraction control...........................................42
14.3.2 2nd transfer roller cleaning.......................................................................42
14.3.3 Neutralization and separation of media....................................................43
15. Toner collecting section.....................................................................................43
15.1 Composition.....................................................................................................43
15.2 Drive.................................................................................................................43

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Oki Data CONFIDENTIAL
15.3 Operation.........................................................................................................44
15.3.1 Toner collecting mechanism.....................................................................44
15.3.2 Waste toner near full detection system ....................................................44
16. Media feed section.............................................................................................45
16.1 Composition.....................................................................................................45
16.2 Drive.................................................................................................................45
16.3 Operation.........................................................................................................46
16.3.1 Up/down control........................................................................................46
16.3.2 Paper feed control ....................................................................................46
16.3.3 Double feed prevention mechanism.........................................................46
16.3.4 Remaining media detection control..........................................................46
16.3.5 Media feed retry function..........................................................................47
17. Fusing section....................................................................................................47
17.1 Composition..................................................................................................... 47
17.2 Drive.................................................................................................................48
17.3 Operation.........................................................................................................48
17.3.1 Fusing temperature control.......................................................................48
17.3.2 Wait control...............................................................................................49
17.3.3 Print control ..............................................................................................49
17.3.4 Protection against abnormally high temperature......................................49
17.3.5 PPM control..............................................................................................49
18. Media exit section ..............................................................................................50
18.1 Composition.....................................................................................................50
18.2 Drive.................................................................................................................50
18.3 Operation.........................................................................................................50
18.3.1 Conveyance control..................................................................................50
18.3.2 Media exit full detection control ................................................................50
19. Image stabilization control................................................................................. 51
19.1 Overview..........................................................................................................51
19.2 Operation.........................................................................................................51
19.2.1 Leak detection control ..............................................................................51
19.2.2 IDC sensor LED intensity control..............................................................51
19.2.3 Transfer belt surface correction control.....................................................51
19.2.4 Control of the maximum amount of toner sticking ....................................51
19.2.5 Laser intensity adjustment control............................................................51
19.2.6 correction control...................................................................................51
19.3 Operation timing..............................................................................................52
19.4 Operation flow.................................................................................................. 52
20. Fan control .........................................................................................................52
20.1 Composition.....................................................................................................52
20.2 Operation.........................................................................................................52
20.2.1 Function....................................................................................................52
20.2.2 Control conditions.....................................................................................53