Epson EPL-5900 User manual

EPSON EPL-5900 / EPL-5900L
Monochrome Page Printer
®
SERVICE MANUAL
SEPG01005

Notice
All rights reserved. No part of this manual may be reproduced, stored in a retrieval system, or transmitted in any form or by any means electronic, mechanical,
photocopying, or otherwise, without the prior written permission of SEIKO EPSON CORPORATION.
All effort have been made to ensure the accuracy of the contents of this manual. However, should any errors be detected, SEIKO EPSON would greatly
appreciate being informed of them.
The contents of this manual are subject to change without notice.
All effort have been made to ensure the accuracy of the contents of this manual. However, should any errors be detected, SEIKO EPSON would greatly
appreciate being informed of them.
The above not withstanding SEIKO EPSON CORPORATION can assume no responsibility for any errors in this manual or the consequences thereof.
EPSON is a registered trademark of SEIKO EPSON CORPORATION.
General Notice: Other product names used herein are for identification purpose only and may be trademarks or registered trademarks of their
respective owners. EPSON disclaims any and all rights in those marks.
Copyright © 2001 SEIKO EPSON CORPORATION.
Imaging & Information Product Division
TPCS Quality Assurance Department

PRECAUTIONS
Precautionary notations throughout the text are categorized relative to 1)Personal injury and 2) damage to equipment.
DANGER Signals a precaution which, if ignored, could result in serious or fatal personal injury. Great caution should be exercised in performing procedures preceded by
DANGER Headings.
WARNING Signals a precaution which, if ignored, could result in damage to equipment.
The precautionary measures itemized below should always be observed when performing repair/maintenance procedures.
DANGER
1. ALWAYS DISCONNECT THE PRODUCT FROM THE POWER SOURCE AND PERIPHERAL DEVICES PERFORMING ANY MAINTENANCE OR REPAIR PROCEDURES.
2. NO WORK SHOULD BE PERFORMED ON THE UNIT BY PERSONS UNFAMILIAR WITH BASIC SAFETY MEASURES AS DICTATED FOR ALL ELECTRONICS
TECHNICIANS IN THEIR LINE OF WORK.
3. WHEN PERFORMING TESTING AS DICTATED WITHIN THIS MANUAL, DO NOT CONNECT THE UNIT TO A POWER SOURCE UNTIL INSTRUCTED TO DO SO. WHEN
THE POWER SUPPLY CABLE MUST BE CONNECTED, USE EXTREME CAUTION IN WORKING ON POWER SUPPLY AND OTHER ELECTRONIC COMPONENTS.
4. WHEN DISASSEMBLING OR ASSEMBLING A PRODUCT, MAKE SURE TO WEAR GLOVES TO AVOID INJURIER FROM METAL PARTS WITH SHARP EDGES.
WARNING
1. REPAIRS ON EPSON PRODUCT SHOULD BE PERFORMED ONLY BY AN EPSON CERTIFIED REPAIR TECHNICIAN.
2. MAKE CERTAIN THAT THE SOURCE VOLTAGES IS THE SAME AS THE RATED VOLTAGE, LISTED ON THE SERIAL NUMBER/RATING PLATE. IF THE EPSON
PRODUCT HAS A PRIMARY AC RATING DIFFERENT FROM AVAILABLE POWER SOURCE, DO NOT CONNECT IT TO THE POWER SOURCE.
3. ALWAYS VERIFY THAT THE EPSON PRODUCT HAS BEEN DISCONNECTED FROM THE POWER SOURCE BEFORE REMOVING OR REPLACING PRINTED CIRCUIT
BOARDS AND/OR INDIVIDUAL CHIPS.
4. IN ORDER TO PROTECT SENSITIVE MICROPROCESSORS AND CIRCUITRY, USE STATIC DISCHARGE EQUIPMENT, SUCH AS ANTI-STATIC WRIST STRAPS, WHEN
ACCESSING INTERNAL COMPONENTS.
5. DO NOT REPLACE IMPERFECTLY FUNCTIONING COMPONENTS WITH COMPONENTS WHICH ARE NOT MANUFACTURED BY EPSON. IF SECOND SOURCE IC OR
OTHER COMPONENTS WHICH HAVE NOT BEEN APPROVED ARE USED, THEY COULD CAUSE DAMAGE TO THE EPSON PRODUCT, OR COULD VOID THE
WARRANTY OFFERED BY EPSON.

About This Manual
This manual describes basic functions, theory of electrical and mechanical operations, maintenance and repair procedures of the printer. The instructions and procedures included
herein are intended for the experienced repair technicians, and attention should be given to the precautions on the preceding page.
Manual Configuration
This manual consists of six chapters and Appendix.
CHAPTER 1.PRODUCT DESCRIPTIONS
Provides a general overview and specifications of the product.
CHAPTER 2.OPERATING PRINCIPLES
Describes the theory of electrical and mechanical operations of
the product.
CHAPTER 3.TROUBLESHOOTING
Describes the step-by-step procedures for the troubleshooting.
CHAPTER 4.DISASSEMBLY / ASSEMBLY
Describes the step-by-step procedures for disassembling and
assembling the product.
CHAPTER 5.ADJUSTMENT
Provides Epson-approved methods for adjustment.
CHAPTER 6.MAINTENANCE
Provides preventive maintenance procedures and the lists of
Epson-approved lubricants and adhesives required for servicing
the product.
APPENDIX Provides the following additional information for reference:
• Connector pin assignments
• Electric circuit boards components layout
• Electrical circuit boards schematics
• Exploded diagram & Parts List
Symbols Used in this Manual
Various symbols are used throughout this manual either to provide additional
information on a specific topic or to warn of possible danger present during a
procedure or an action. Be aware of all symbols when they are used, and
always read NOTE, CAUTION, or WARNING messages.
Indicates an operating or maintenance procedure, practice or
condition that is necessary to keep the product’s quality.
Indicates an operating or maintenance procedure, practice, or
condition that, if not strictly observed, could result in damage to,
or destruction of, equipment.
May indicate an operating or maintenance procedure, practice or
condition that is necessary to accomplish a task efficiently. It may
also provide additional information that is related to a specific
subject, or comment on the results achieved through a previous
action.
Indicates an operating or maintenance procedure, practice or
condition that, if not strictly observed, could result in injury or loss
of life.
A D J U S T M E N T
R E Q U I R E D
C A U T I O N
CHECK
P O I N T
W ARNING

Safety Precautions for Inspection and Service
When performing inspection and service procedures, observe the
following precautions to prevent accidents and ensure utmost safety.
* Depending on the model, some of the precautions given in the
following do not apply.
Different markings are used to denote specific meanings as detailed
below.
The following graphic symbols are used to give instructions that need to
be observed.
WARNING
W ARNING
fIndicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
C A U T I O N
Indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury. It may
also be used to alert against unsafe practices.
Used to call the service technician's attention to what is
graphically represented inside the marking (including a
warning).
Used to prohibit the service technician's from doing what is
graphically represented inside the marking.
Used to instruct the service technician's to do what is
graphically represented inside the marking.
1.Always observe precautions.
Parts requiring special attention in this product will include a
label containing the mark shown on the left plus
precautionary notes. Be sure to observe the precautions.
Be sure to observe the “Safety Information” given in the
Operator's Manual.
2.Before starting the procedures, be sure to unplug the power
cord.
This product contains a high-voltage unit and a circuit with a
large current capacity that may cause an electric shock or
burn.
The product also contains parts that can jerk suddenly and
cause injury.
If this product uses a laser, laser beam leakage may cause
eye damage or blindness.
3.Use the specified parts.
For replacement parts, always use the genuine parts
specified in the manufacturer's parts manual. Installing a
wrong or unauthorized part could cause dielectric
breakdown, overload, or undermine safety devices resulting
in possible electric shock or fire.
Replace a blown electrical fuse or thermal fuse with its
corresponding genuine part specified in the manufacturer's
parts manual. Installing a fuse of a different make or rating
could lead to a possible fire. If a thermal fuse blows
frequently, the temperature control system may have a
problem and action must be taken to eliminate the cause of
the problem.
W ARNING

4.Handle the power cord with care and never use a multiple outlet.
Do not break, crush or otherwise damage the power cord.
Placing a heavy object on the power cord, or pulling or
bending it may damage it, resulting in a possible fire or
electric shock.
Do not use a multiple outlet to which any other appliance or
machine is connected.
Be sure the power outlet meets or exceeds the specified
capacity.
5.Be careful with the high-voltage parts.
A part marked with the symbol shown on the left carries a
high voltage. Touching it could result in an electric shock or
burn. Be sure to unplug the power cord before servicing this
part or the parts near it.
6.Do not work with wet hands.
Do not unplug or plug in the power cord, or perform any kind
of service or inspection with wet hands. Doing so could
result in an electric shock.
7.Do not touch a high-temperature part.
A part marked with the symbol shown on the left and other
parts such as the exposure lamp and fusing roller can be
very hot while the machine is energized. Touching them
may result in a burn.
Wait until these parts have cooled down before replacing
them or any surrounding parts.
8.Maintain a grounded connection at all times.
(This item may not apply in the USA.)
Be sure to connect the ground wire to the ground terminal
even when performing an inspection or repair. Without
proper grounding, electrical leakage could result in an
electric shock or fire.
Never connect the ground wire to a gas pipe, water pipe,
telephone ground wire, or a lightning conductor.
9.Do not remodel the product.
Modifying this product in a manner not authorized by the
manufacturer may result in a fire or electric shock. If this
product uses a laser, laser beam leakage may cause eye
damage or blindness.
10.Restore all parts and harnesses to their original positions.
To promote safety and prevent product damage, make sure
the harnesses are returned to their original positions and
properly secured in their clamps and saddles in order to
avoid hot parts, high-voltage parts, sharp edges, or being
crushed.
To promote safety, make sure that all tubing and other
insulating materials are returned to their original positions.
Make sure that floating components mounted on the circuit
boards are at their correct distance and position off the
boards.

CAUTION
1.Precautions for Service Jobs
A toothed washer and spring washer, if used originally,
must be reinstalled. Omitting them may result in contact
failure which could cause an electric shock or fire.
When reassembling parts, make sure that the correct
screws (size, type) are used in the correct places. Using the
wrong screw could lead to stripped threads, poorly secured
parts, poor insulating or grounding, and result in a
malfunction, electric shock or injury.
Take great care to avoid personal injury from possible burrs
and sharp edges on the parts, frames and chassis of the
product.
When moving the product or removing an option, use care
not to injure your back or allow your hands to be caught in
mechanisms.
2.Precautions for Servicing with Covers and Parts Removed
Wherever feasible, keep all parts and covers mounted when
energizing the product.
If energizing the product with a cover removed is absolutely
unavoidable, do not touch any exposed live parts and use
care not to allow your clothing to be caught in the moving
parts. Never leave a product in this condition unattended.
Never place disassembled parts or a container of liquid on
the product. Parts falling into, or the liquid spilling inside, the
mechanism could result in an electric shock or fire.
Never use a flammable spray near the product. This could
result in a fire.
Make sure the power cord is unplugged before removing or
installing circuit boards or plugging in or unplugging
connectors.
Always use the interlock switch actuating jig to actuate an
interlock switch when a cover is opened or removed. The
use of folded paper or some other object may damage the
interlock switch mechanism, possibly resulting in an electric
shock, injury or blindness.
C A U T I O N 3.Precautions for the Working Environment
The product must be placed on a flat, level surface that is
stable and secure.
Never place this product or its parts on an unsteady or tilting
workbench when servicing.
Provide good ventilation at regular intervals if a service job
must be done in a confined space for a long period of time.
Avoid dusty locations and places exposed to oil or steam.
Avoid working positions that may block the ventilation ports
of the product.
4.Precautions for Handling Batteries
(Lithium, Nickel-Cadmium, etc.)
Replace a rundown battery with the same type as specified
in the manufacturer's parts manual.
Before installing a new battery, make sure of the correct
polarity of the installation or the battery could burst.
Dispose of used batteries according to the local regulations.
Never dispose of them at the user's premises or attempt to
try to discharge one.

Other Precautions
When handling circuit boards, observe the “HANDLING of PWBs”.
The PC Drum is a very delicate component. Observe the precautions
given in “HANDLING OF THE PC DRUM” because mishandling may
result in serious image problems.
Note that replacement of a circuit board may call for readjustments or
resetting of particular items, or software installation.
5.Precautions for the Laser Beam
(Only for Products Employing a Laser)
Removing the cover marked with the following caution label
could lead to possible exposure to the laser beam, resulting
in eye damage or blindness. Be sure to unplug the power
cord before removing this cover.
If removing this cover while the power is ON is unavoidable,
be sure to wear protective laser goggles that meet
specifications.
Make sure that no one enters the room when the machine is
in this condition.
When handling the laser unit, observe the “Precautions for
Handling Laser Equipment.”

Precautions for Service
When performing inspection and service procedures, observe the
following precautions to prevent mishandling of the machine and its
parts.
* Depending on the model, some of the precautions given in the
following do not apply.
PRECAUTIONS BEFORE SERVICE
When the user is using a word processor or personal computer from
a wall outlet of the same line, take necessary steps to prevent the
circuit breaker from opening due to overloads.
Never disturb the LAN by breaking or making a network connection,
altering termination, installing or removing networking hardware or
software, or shutting down networked devices without the
knowledge and express permission of the network administrator or
the shop supervisor.
HOW TO USE THIS BOOK
DIS/REASSEMBLY, ADJUSTMENT
To reassemble the product, reverse the order of disassembly
unless otherwise specified.
TROUBLESHOOTING
If a component on a PWB or any other functional unit including a
motor is defective, the text only instructs you to replace the
whole PWB or functional unit and does not give troubleshooting
procedures applicable within the defective unit.
All troubleshooting procedures contained herein assume that
there are no breaks in the harnesses and cords and all
connectors are plugged into the right positions.
The procedures preclude possible malfunctions due to noise
and other external causes.
PRECAUTIONS FOR SERVICE
Check the area surrounding the service site for any signs of
damage, wear or need of repair.
Keep all disassembled parts in good order and keep tools under
control so that none will be lost or damaged.
After completing a service job, perform a safety check. Make sure
that all parts, wiring and screws are returned to their original
positions.
Do not pull out the toner hopper while the toner bottle is turning.
This could result in a damaged motor or locking mechanism.
If the product is to be run with the front door open, make sure that
the toner hopper is in the locked position.
Do not use an air gun or vacuum cleaner for cleaning the ATDC
Sensor and other sensors, as they can cause electrostatic
destruction. Use a blower brush and cloth. If a unit containing these
sensors is to be cleaned, first remove the sensors from the unit.

PRECAUTIONS FOR DIS/REASSEMBLY
Be sure to unplug the copier from the outlet before attempting to
service the copier.
The basic rule is not to operate the copier anytime during
disassembly. If it is absolutely necessary to run the copier with its
covers removed, use care not to allow your clothing to be caught in
revolving parts such as the timing belt and gears.
Before attempting to replace parts and unplug connectors, make
sure that the power cord of the copier has been unplugged from the
wall outlet.
Be sure to use the Interlock Switch Actuating Jig whenever it is
necessary to actuate the Interlock Switch with the covers left open
or removed.
While the product is energized, do not unplug or plug connectors
into the circuit boards or harnesses.
Never use flammable sprays near the copier.
A used battery should be disposed of according to the local
regulations and never be discarded casually or left unattended at
the user's premises.
When reassembling parts, make sure that the correct screws (size,
type) and toothed washer are used in the correct places.
If it becomes necessary to replace the thermal fuse or any other
fuse mounted on a board, be sure to use one of the rating marked
on the blown fuse. Always note the rating marked on the fuse, as
the rating and mounting site or number used are subject to change
without notice.
PRECAUTIONS FOR CIRCUIT INSPECTION
Never create a closed circuit across connector pins except those
specified in the text and on the printed circuit.
When creating a closed circuit and measuring a voltage across
connector pins specified in the text, be sure to use the GND wire.
HANDLING OF PWBS
During Transportation/Storage:
During transportation or when in storage, new P.W. Boards must
not be indiscriminately removed from their protective conductive
bags.
Do not store or place P.W. Boards in a location exposed to
direct sunlight and high temperature.
When it becomes absolutely necessary to remove a Board from
its conductive bag or case, always place it on its conductive mat
in an area as free as possible from static electricity.
Do not touch the pins of the ICs with your bare hands.
Protect the PWBs from any external force so that they are not
bent or damaged.
During Inspection/Replacement:
Avoid checking the IC directly with a multimeter; use connectors
on the Board.
Never create a closed circuit across IC pins with a metal tool.
Before unplugging connectors from the P.W. Boards, make sure
that the power cord has been unplugged from the outlet.

When removing a Board from its conductive bag or conductive
case, do not touch the pins of the ICs or the printed pattern.
Place it in position by holding only the edges of the Board.
When touching the PWB, wear a wrist strap and connect its cord
to a securely grounded place whenever possible. If you cannot
wear a wrist strap, touch a metal part to discharge static
electricity before touching the PWB.
Note that replacement of a PWB may call for readjustments or
resetting of particular items.
HANDLING OF OTHER PARTS
The magnet roller generates a strong magnetic field. Do not bring it
near a watch, floppy disk, magnetic card, or CRT tube.
HANDLING OF THE PC DRUM
* Only for Products Not Employing an Imaging Cartridge.
During Transportation/Storage:
Use the specified carton whenever moving or storing the PC
Drum.
The storage temperature is in the range between -20°C and
+40°C.
In summer, avoid leaving the PC Drum in a car for a long time.
Handling:
Ensure that the correct PC Drum is used.
Whenever the PC Drum has been removed from the copier,
store it in its carton or protect it with a Drum Cloth.
The PC Drum exhibits greatest light fatigue after being exposed
to strong light over an extended period of time. Never, therefore,
expose it to direct sunlight.
Use care not to contaminate the surface of the PC Drum with oil-
base solvent, fingerprints, and other foreign matter.
Do not scratch the surface of the PC Drum.
Do not apply chemicals to the surface of the PC Drum.
Do not attempt to wipe clean the surface of the PC Drum.

If, however, the surface is contaminated with fingerprints, clean it using
the following procedure.
NOTE:
Even when the PC Drum is only locally dirtied, wipe the entire
surface.
Do not expose the PC Drum to direct sunlight. Clean it as
quickly as possible even under interior illumination.
If dirt remains after cleaning, repeat the entire procedure from
the beginning one more time.
1. Place the PC Drum into one half of its carton.
2. Gently wipe the residual toner off the
surface of the PC Drum with a dry, Dust-
Free Cotton Pad.
A.Turn the PC Drum so that the area of its
surface on which the line of toner left by the
Cleaning Blade is present is facing straight
up. Wipe the surface in one continuous
movement from the rear edge of the PC
Drum to the front edge and off the surface
of the PC Drum.
B. Turn the PC Drum slightly and wipe the
newly exposed surface area with a CLEAN
face of the Dust-Free Cotton Pad. Repeat
this procedure until the entire surface of the
PC Drum has been thoroughly cleaned.
*At this time, always use a CLEAN face of the dry
Dust-Free Cotton Pad until no toner is evident on
the face of the Pad after wiping.
3. Soak a small amount of either ethyl alcohol
or isopropyl alcohol into a clean, unused
Dust-Free Cotton Pad which has been
folded over into quarters. Now, wipe the
surface of the PC Drum in one continuous
movement from its rear edge to its front
edge and off its surface one to two times.
*Never move the Pad back and forth.
4. Using the SAME face of the Pad, repeat the
procedure explained in the latter half of
step 3 until the entire surface of the PC
Drum has been wiped. Always OVERLAP
the areas when wiping. Two complete turns
of the PC Drum would be appropriate for
cleaning.

HANDLING OF THE IMAGING CARTRIDGE
* Only for Products Employing an Imaging Cartridge.
During Transportation/Storage:
The storage temperature is in the range between -20°C and
+40°C.
In summer, avoid leaving the Imaging Cartridge in a car for a
long time.
Handling:
Store the Imaging Cartridge in a place that is not exposed to
direct sunlight.
Precautionary Information on the PC Drum Inside the Imaging
Cartridge:
Use care not to contaminate the surface of the PC Drum with oil-
base solvent, fingerprints, and other foreign matter.
Do not scratch the surface of the PC Drum.
Do not attempt to wipe clean the surface of the PC Drum.
WARNING
Do not throw the toner cartridge or toner into an open
flame. The hot toner may scatter and cause burns or
other damage.
W ARNING

SAFETY INFORMATION
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.
INTERNAL LASER RADIATION
*: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 SERVICE ITEM. Therefore, the
print head unit should not be opened under any circumstances.
the U.S.A., Canada (CDRH Regulation)
This machine is certified as a Class I 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 to page 15 indicates compliance with the
CDRH regulations and must be attached to laser products
marketed in the United States.
All Areas
semiconductor laser
Maximum average radiation power(*) 27.1 µW
Wavelength 770-810 nm
This figure shows the view inside the Top Cover with the Toner Car-
tridge and the Drum Cartridge removed.
Laser Aperture of the Print Head Unit
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 5 mW
Wavelength 770-810 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 5 mW
Wavelength 770-810 nm

Denmark
Norway
Finland, Sweden
ADVARSEL
Usynlig laserstråling ved åbning, når sikkerhedsafbrydere er ude af funktion.
Undgå udsættelse for stråling. Klasse 1 laser produkt der opfylder IEC60825
sikkerheds kravene.
halvlederlaser
Laserdiodens højeste styrke 5 mW
bølgelængden 770-810 nm
ADVERSEL
Dersom apparatet brukes på annen måte enn spesifisert i denne
bruksanvisning, kan brukeren utsettes för unsynlig laserstrålning, som
overskrider grensen for laser klass 1.
halvleder laser
Maksimal effekt till laserdiode 5 mW
bølgelengde 770-810 nm
LUOKAN 1 LASERLAITE
KLASS 1 LASER APPARAT
VAROITUS!
Laitteen käyttäminen muulla kuin tässä käyttöohjeessa mainitulla tavalla
saattaa altistaa käyttäjän turvallisuusluokan 1 ylittävälle näkymättömälle
lasersäteilylle.
puolijohdelaser
Laserdiodin suurin teho 5 mW
aallonpituus 770-810 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 5 mW
våglängden 770-810 nm
VARO!
Avattaessa ja suojalukitus ohitettaessa olet alttiina näkymättomälle
lasersäteilylle. Älä katso säteeseen.
VARNING!
Osynlig laserstråining när denna del är öppnad och spärren är urkopplad.
Betrakta ej stråien.

LASER SAFETY LABEL
A laser safety label is attached to the outside of the machine as shown
below.
LASER CAUTION LABEL
A laser caution label is attached to the inside of the machine as shown
below.
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.
CAUTION

Revision Status
Revision Date of Issue Description
0 July 2, 2001 Partial release (Chapter 1/ Chapter4) (provisional)
A September 20, 2001 Formal first release
B February 7, 2002 [Revised] The sections listed below are revised.
Chapter 1: Table 1-47. Printer Messages (Only with EPL-5900)
Chapter 3: Table 3-1. Service Call Error (Engine-Related)
Chapter 7: 7.4 Exploded Diagrams
Chapter 7: 7.5 ASP List

EPSON EPL-5900/EPL-5900L Revision B
1
Contents
Chapter 1 Product Description
1.1 Outline ...................................................................................................... 5
1.1.1 Features............................................................................................. 5
1.1.2 “EPL-5900” Differences from EPL-5800 ........................................ 7
1.1.3 “EPL-5900L” Differences from EPL-5800L ................................... 7
1.1.4 “EPL-5900L” Differences from EPL-5900...................................... 7
1.1.5 Restrictions on Use of “EPL-5900L” ............................................... 8
1.2 Basic Specifications.................................................................................. 8
1.2.1 Process Specifications ...................................................................... 8
1.2.2 Printer Basic Specifications.............................................................. 8
1.2.3 Various Sensors .............................................................................. 16
1.2.4 Paper Specification......................................................................... 17
1.2.4.1 Paper Type........................................................................................... 17
1.2.4.2 Paper Feedings .................................................................................... 17
1.2.4.3 Printable Area...................................................................................... 17
1.2.5 Reliability, Durability, Serviceability............................................. 18
1.2.6 Operating Conditions (Including Imaging Cartridge) .................... 20
1.2.7 Storage and Transport of the Printer Main Unit and Optional Products
(Consumables Packaged)......................................................................... 21
1.2.8 Electrical Features .......................................................................... 22
1.2.9 Compliance with Standards and Regulations ................................. 22
1.2.10 Consumable Components............................................................. 23
1.2.10.1 Specifications .................................................................................... 23
1.2.10.2 Packing Storage and Transport Environments .................................. 24
1.3.1 Overall Dimensions of EPL-5900 .................................................. 25
1.3.2 Overall Dimensions of EPL-5900L................................................ 26
1.3.3 Names of Parts of EPL-5900.......................................................... 27
1.3.4 Names of Parts of EPL-5900L ....................................................... 29
1.4 Controller Specification.......................................................................... 31
1.4.1 Basic Controller Specifications ...................................................... 31
1.4.2 External I/F Specifications ............................................................. 32
1.4.2.1 Parallel Interface Specifications.......................................................... 33
1.4.2.2 USB Interface...................................................................................... 34
1.4.2.3 Type B Interface (Not Available with EPL-5900L)............................ 34
1.5 Control Panel........................................................................................... 36
1.5.1 External Appearance and Names of Parts....................................... 36
1.5.2 List of Panel Settings (Only with EPL-5900)................................. 38
1.5.2.1 Setting Items (Model-dependent) (Only with EPL-5900)................... 43
1.5.3 Printer Messages (Only with EPL-5900)........................................ 45
1.5.3.1 Status Specifications (Model-dependent)............................................ 47
1.7 System Requirements (Only for EPL-5900L)......................................... 50
1.9 Paper Feed Specifications (Only for EPL-5900L).................................. 52
1.9.1 Paper Size ....................................................................................... 52
1.9.2 Paper Feed Specifications............................................................... 52
1.9.3 Case List ......................................................................................... 53
1.9.4 Special Notes .................................................................................. 53
1.10 Notes on Operation ............................................................................... 54
1.10.1 Powering Off (EPL-5900) ............................................................ 54
1.10.2 Caution About Hot Parts (EPL-5900/EPL-5900L)....................... 54
1.10.3 About the Moist Environment Mode Select Jumper (EPL-5900L) 54
1.11 Engine Environment Setting ................................................................. 55
1.12 Ambient Conditions .............................................................................. 55
1.13 Differences in Specifications between Intended Markets..................... 56
1.13.1 Differences in Specifications ........................................................ 56
1.13.2 Jumper Setting .............................................................................. 57
Chapter 2 Operating Principles
2.1 Overview................................................................................................. 59
2.1.1 EPL-5900 Major Components ........................................................ 59
2.1.2 EPL-5900L Major Components...................................................... 60

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2.1.3 Drive System .................................................................................. 61
2.1.4 Names and Functions of Electrical Parts (Printer Body)................ 62
2.1.5 Names and Functions of Electrical Parts (Lower Cassette)
(Not Applicable to EPL-5900L).............................................................. 63
2.1.6 Timing Chart .................................................................................. 64
2.2 Description of Mechanisms .................................................................... 65
2.2.1 Paper Path....................................................................................... 65
2.2.2 Paper Feed Mechanism................................................................... 66
2.2.2.1 Paper Tray ........................................................................................... 66
2.2.2.2 Lower Cassette Unit (Option for EPL-5900) ...................................... 67
2.2.3 Charging Process ............................................................................ 69
2.2.4 Exposure Process............................................................................ 70
2.2.5 Development Process ..................................................................... 71
2.2.6 Transfer Process ............................................................................. 72
2.2.7 Fusing Process ................................................................................ 73
2.2.8 Paper Eject Process......................................................................... 75
2.3 Operating Principles of Electric Circuitry .............................................. 76
2.3.1 Operation Overview of the Main Control Circuit Board................ 76
Chapter 3 Troubleshooting
3.1 Overview................................................................................................. 80
3.1.1 Specified Tools............................................................................... 80
3.1.2 Procedure for Troubleshooting....................................................... 80
3.1.3 Printer Messages (EPL-5900)......................................................... 80
3.1.3.1 Service Call Error................................................................................ 80
3.1.4 Printer Messages (EPL-5900L) ...................................................... 84
3.1.4.1 Printer Status. ...................................................................................... 84
3.1.4.2 Engine Error ........................................................................................ 84
3.1.5 Paper Jam Detection ....................................................................... 85
3.1.5.1 Overview ............................................................................................. 85
3.1.5.2 Paper Jam Conditions.......................................................................... 85
3.1.5.3 Resetting the Paper Jam ...................................................................... 85
3.1.6 Detection of Abnormal Operations ................................................ 86
3.2 Troubleshooting for Paper Jam............................................................... 87
3.2.1 Paper Jam when the Power is ON .................................................. 87
3.2.2 Paper Jam in Paper Feed to Paper Transport.................................. 87
3.2.3 Paper Jam in Paper Transport to Paper Eject.................................. 88
3.3 Troubleshooting for Abnormal Operations............................................. 89
3.3.1 Abnormal Laser .............................................................................. 89
3.3.2 Abnormal Polygon Motor............................................................... 89
3.3.3 Abnormal Main Motor.................................................................... 89
3.3.4 Abnormal Fusing ............................................................................ 89
3.3.5 Power Cannot be Turned ON.......................................................... 90
3.4 Troubleshooting for Print Quality Problems........................................... 91
3.4.1 All White......................................................................................... 91
3.4.2 All Black ......................................................................................... 91
3.4.3 White Out........................................................................................ 92
3.4.4 Back of Paper Gets Dirty ................................................................ 92
3.4.5 Low Image Density......................................................................... 92
3.4.6 Foggy Background.......................................................................... 92
3.4.7 White Line / Black Line.................................................................. 93
3.4.8 Offset Image ................................................................................... 93
Chapter 4 Disassembly and Assembly
4.1 Overview................................................................................................. 95
4.1.1 Precautions...................................................................................... 95
4.1.2 Tools ............................................................................................... 97
4.1.3 Screws............................................................................................. 97
4.2 Main Unit Disassembly........................................................................... 98
4.2.1 Preparation before Disassembling .................................................. 99
4.2.2 Imaging Cartridge and Drum Cartridge Removal .......................... 99
4.3 Disassembly and Reassembly of the Printer Body ............................... 100
4.3.1 Transfer Roller Removal .............................................................. 100
4.3.2 Paper Separator Unit Removal ..................................................... 101
4.3.3 Right Cover Removal ................................................................... 101
4.3.4 Control Panel Removal................................................................. 102
4.3.5 Main Board Assy Removal........................................................... 103
4.3.6 Interface Board (C409I/F) Removal............................................. 104
4.3.7 Left Cover Removal...................................................................... 105
4.3.8 Front Cover Removal.................................................................... 105
4.3.9 Paper Feed Roller Removal .......................................................... 106

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4.3.10 Printing Head Unit Removal ...................................................... 106
4.3.11 Paper Empty Sensor (PE1) Removal.......................................... 107
4.3.12 Top Cover and Rear Cover Removal ......................................... 107
4.3.13 Fuser Unit Removal.................................................................... 108
4.3.14 Fuser Unit Disassembly.............................................................. 109
4.3.15 Power Supply Unit and High Voltage Board Removal.............. 113
4.3.16 Main Motor Assy (M1) Removal ............................................... 115
4.4 500-sheet Lower Cassette Unit (Optional) ........................................... 117
4.4.1 Second Paper Feed Roller Removal ............................................. 117
4.4.2 Second Paper Feed Unit Removal................................................ 118
4.4.3 Relay Board (PWB-A) Removal .................................................. 119
4.4.4 Cassette Type Detect Switch (SW21) Removal........................... 119
4.4.5 Second Paper Feed Solenoid (SL21) Removal ............................ 120
Chapter 5 Adjustment
5.1 Overview............................................................................................... 122
5.2 USB ID Input........................................................................................ 123
5.2.1 Installation Procedure for Program .............................................. 123
5.2.2 Procedure for Program Operation ................................................ 123
5.2.3 USB ID Confirmation................................................................... 125
Chapter 6 Maintenance
6.1 Overview............................................................................................... 127
6.1.1 Cleaning........................................................................................ 127
6.1.2 Maintenance ................................................................................. 127
Chapter 7 Appendix
7.1 Connectors ............................................................................................ 129
7.1.1 Circuit Boards............................................................................... 129
7.1.1.1 Connectors on Main Board Assy (EPL-5900) .................................. 129
7.1.1.2 Connectors on Main Board Assy (EPL-5900L) ................................ 130
7.1.1.3 Interface Board (C409I/F)................................................................. 131
7.1.1.4 PU1 (Power Supply Unit) Board....................................................... 131
7.1.1.5 HV1 (High Voltage Unit) Board....................................................... 131
7.2 Circuit Board Component Layout......................................................... 132
7.3 Circuit Diagrams ................................................................................... 137
7.4 Exploded Diagrams............................................................................... 145
7.5 ASP List ................................................................................................ 158