Epson 3800 - Stylus Pro Color Inkjet Printer User manual

EPSON Stylus Pro 3800/3800C/3850
Large Format Color Inkjet Printer
S
SERVICE MANUAL
SEIJ06007

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, recording, or otherwise, without the prior written permission of SEIKO EPSON CORPORATION.
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 © 2006 SEIKO EPSON CORPORATION.
Imaging Products CS, PL & Environmental Management

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 INJURY 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. REPLACE MALFUNCTIONING COMPONENTS ONLY WITH THOSE COMPONENTS BY THE MANUFACTURE; INTRODUCTION OF SECOND-
SOURCE ICs OR OTHER NON-APPROVED COMPONENTS MAY DAMAGE THE PRODUCT AND VOID ANY APPLICABLE EPSON WARRANTY.
6. WHEN AIR DUSTER IS USED ON THE REPAIR AND THE MAINTENANCE WORK, THE USE OF THE AIR DUSTER PRODUCTS CONTAINING
THE INFLAMMABLE GAS IS PROHIBITED.

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.
CHAPTER 7.APPENDIX
Provides the following additional information for reference:
• Connectors
• Routing
• ASP List
• Exploded Diagrams
• Circuit Diagrams
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.
Indicates that a particular task must be carried out according to a certain
standard after disassembly and before re-assembly, otherwise the quality
of the components in question may be adversely affected.

Revision Status
Revision Date of Issue Description
A November 30, 2006 First release

EPSON Stylus Pro 3800/3800C/3850 Revision A
6
Contents
Chapter 1 PRODUCT DESCRIPTION
1.1 Product Description ............................................................................................ 10
1.2 Basic Specifications ............................................................................................ 11
1.2.1 Basic Specifications ................................................................................... 11
1.2.2 Electric Specifications ............................................................................... 12
1.2.3 Environmental Characteristics ................................................................... 12
1.2.4 Reliability/Durability ................................................................................. 13
1.3 Printing Specifications ........................................................................................ 14
1.3.1 Paper Feed Specifications .......................................................................... 14
1.3.2 Paper Feeder Specifications ....................................................................... 14
1.3.3 Paper Support ............................................................................................. 15
1.3.4 Printable Area ............................................................................................ 16
1.4 Print Mode .......................................................................................................... 17
1.4.1 Print Mode ................................................................................................. 17
1.4.2 Borderless Printing .................................................................................... 17
1.5 Appearance Specifications ................................................................................. 19
1.5.1 Dimensions/Weight ................................................................................... 19
1.5.2 Part Names ................................................................................................. 19
1.6 Operation Panel .................................................................................................. 20
1.6.1 Buttons and Functions ............................................................................... 20
1.6.2 Buttons ....................................................................................................... 20
1.6.3 LED ............................................................................................................ 20
1.6.4 Panel Display ............................................................................................. 21
1.6.5 Icons on the LCD ....................................................................................... 22
1.6.6 Menu Settings ............................................................................................ 24
1.6.7 Maintenance Mode .................................................................................... 28
1.6.8 Error/Warning Statuses Displayed/Indicated on/by LCD/LED ................ 29
Chapter 2 OPERATING PRINCIPLES
2.1 Overview ............................................................................................................ 36
2.2 Print Mechanism ................................................................................................. 40
2.3 Ink Supply Mechanism ....................................................................................... 41
2.3.1 Ink Flow Path ............................................................................................. 41
2.3.2 Ink Pressurizing Mechanism ..................................................................... 41
2.3.3 Ink Change System .................................................................................... 43
2.4 Cleaning Mechanism .......................................................................................... 44
2.5 Carriage Mechanism ........................................................................................... 46
2.5.1 Carriage Movement Mechanism ............................................................... 46
2.5.2 Platen Gap Adjustment Mechanism .......................................................... 47
2.6 Paper Feed Mechanism ...................................................................................... 48
2.6.1 Paper Feed Path ......................................................................................... 48
2.6.2 Paper Loading Mechanism ........................................................................ 49
2.6.3 Paper Feed Mechanism .............................................................................. 52
2.7 Ink Mark Sensor ................................................................................................. 56
2.8 Other Mechanisms .............................................................................................. 57
2.9 Outline of Circuit Boards ................................................................................... 58
2.9.1 Main Board ................................................................................................ 58
2.9.2 Power Supply Board .................................................................................. 59
2.10 Colorimetric Calibration (Color ID) Overview ................................................ 60
Chapter 3 TROUBLE SHOOTING
3.1 Overview ............................................................................................................ 62
3.1.1 Preliminary Check ..................................................................................... 62
3.1.2 Troubleshooting Procedure ........................................................................ 62
3.2 List of Panel Messages ....................................................................................... 63
3.3 Remedies for Warning Messages ....................................................................... 66
3.4 Remedies for Error Messages ............................................................................. 68
3.5 Remedies for Service Call Error ........................................................................ 74
3.6 Remedies for Print Quality Troubles .................................................................. 82

EPSON Stylus Pro 3800/3800C/3850 Revision A
7
Chapter 4 DISASSEMBLY & ASSEMBLY
4.1 Overview ............................................................................................................ 86
4.1.1 Precautions ................................................................................................. 86
4.1.2 Orientation Definition ................................................................................ 88
4.1.3 Tools .......................................................................................................... 88
4.1.4 Screws ........................................................................................................ 89
4.1.5 Chapter Organization ................................................................................. 89
4.2 Disassembly Flowchart ...................................................................................... 90
4.3 Disassembly/Assembly Procedure (Group 1) .................................................... 91
4.3.1 Unlocking the CARRIAGE, ASSY. manually .......................................... 91
4.3.2 Consumable ............................................................................................... 92
4.3.3 Removing the Housing and OPERATION, PANEL, ASSY. .................... 94
4.3.4 Removing the Circuit Boards .................................................................. 112
4.3.5 Removing the MOTOR ASSEMBLIES. ................................................. 118
4.3.6 Removing the SENSORS and SWITCHES ............................................ 123
4.3.7 Removing the Carriage Mechanism ........................................................ 130
4.3.8 Removing the PAPER FEED MECHANISM ......................................... 132
4.3.9 Removing the Ink System Mechanism .................................................... 148
4.3.10 Removing the PAPER FEED MECHANISM ....................................... 164
4.3.11 Removing the Carriage Mechanism ...................................................... 169
4.3.12 Removing the INK SYSTEM MECHANISM ...................................... 176
4.3.13 PRINTER MECHANISM ..................................................................... 178
4.4 Disassembly/Assembly Procedure (Group 2) .................................................. 179
4.4.1 Removing the PAPER FEED MECHANISM ......................................... 179
Chapter 5 ADJUSTMENT
5.1 Overview .......................................................................................................... 191
5.1.1 Precautions ............................................................................................... 191
5.1.2 Adjustment Workflow ............................................................................. 191
5.1.3 Parts and Units that Require Adjustments ............................................... 191
5.1.4 Required Adjustments by Part or Unit ..................................................... 192
5.1.5 Description of Adjustments ..................................................................... 193
5.1.6 Tools for Adjustments ............................................................................. 195
5.1.7 Adjustment Program Basic Operations ................................................... 196
5.2 Mechanical Adjustment .................................................................................... 198
5.2.1 PF Timing Belt Tension Adjustment ....................................................... 198
5.2.2 LD Roller Position Adjustment ............................................................... 200
5.2.3 PG Position Adjustment .......................................................................... 201
5.3 Standard Adjustment ........................................................................................ 203
5.3.1 RTC&USB ID ......................................................................................... 203
5.3.2 Head Rank ID .......................................................................................... 204
5.3.3 Print Head Slant Adjustment (PF) ........................................................... 205
5.3.4 Print Head Slant Adjustment (CR) .......................................................... 207
5.3.5 Initial Ink Charge Flag ON/OFF ............................................................. 211
5.3.6 Parameter Backup .................................................................................... 212
5.3.7 Check PG ................................................................................................. 214
5.3.8 Initial Ink Charge ..................................................................................... 215
5.3.9 Cleaning ................................................................................................... 215
5.3.10 Input Serial number ............................................................................... 216
5.3.11 Colorimetric Calibration Tool ............................................................... 217
5.3.12 Install F/W ............................................................................................. 229
5.3.13 Ink Mark Sensor Adjustment for Auto Nozzle Check .......................... 230
5.3.14 Washing Head And Discharge Ink ........................................................ 232
5.3.15 Auto Bi-D Adjustment ........................................................................... 233
5.3.16 Auto Uni-D Adjustment ........................................................................ 234
5.3.17 Check the Release Of Grid Roller ......................................................... 235
5.3.18 Check Network Communication ........................................................... 236
5.3.19 T&B&S Adjustment .............................................................................. 237
5.3.20 PF Adjustment ....................................................................................... 239
5.3.21 EJ Adjustment ........................................................................................ 241
5.3.22 Check Ink Selector Operation ................................................................ 243
5.3.23 Write Constant When CR change .......................................................... 244
5.4 Check Results ................................................................................................... 245
5.4.1 Check Nozzle ........................................................................................... 245
5.4.2 Print Image .............................................................................................. 246
5.4.3 Check Results .......................................................................................... 247
5.4.4 Check Alignment ..................................................................................... 248
5.5 Reset Counters .................................................................................................. 249
Chapter 6 MAINTENANCE
6.1 Overview .......................................................................................................... 251
6.1.1 Product Life Information ......................................................................... 252
6.2 Cleaning ............................................................................................................ 253
6.3 Lubrication ....................................................................................................... 254

EPSON Stylus Pro 3800/3800C/3850 Revision A
8
Chapter 7 APPENDIX
7.1 Connectors ........................................................................................................ 263
7.2 Cables Connection Layout ............................................................................... 265
7.3 ASP List ............................................................................................................ 267
7.4 Exploded Diagrams .......................................................................................... 269
7.5 Circuit Diagrams .............................................................................................. 278

CHAPTER
1
PRODUCT DESCRIPTION

EPSON Stylus Pro 3800/3800C/3850 Revision A
PRODUCT DESCRIPTION Product Description 10
1.1 Product Description
EPSON Stylus Pro 3800/3800C/3850 are large size color inkjet printers that support up
to A2 (17”) sized cut-sheet paper.
F-Mach (180N x 8-column) print head
Maximum print resolution (dpi): 2880 x 1440, Minimum dot: 3.5pl MSDT
Superior color and monochrome reproducibility with eight colors
HCD2 + K3 ink system, consisting of 4 basic colors (YMCK) with 2
complementary colors and 2 complementary blacks
80ml-size (injection volume) new ink cartridge
Automatic switching between black ink modes; Photo black and Matte black.
Requires no user intervention, and ink used during the conversion is remarkably
reduced.
Two manual paper feeders are provided in addition to the ASF (Auto Sheet
Feeder)
Rear manual feeder: FA paper
Front manual feeder: Board paper (up to 1.5 mm thickness)
High speed network and communication supported
100BASE-TX/10BASE-T Network Interface
USB 2.0 High Speed Interface
Borderless printing supported
Clearly arranged buttons and a large LCD offer quick, easy operation
Figure 1-1. External View

EPSON Stylus Pro 3800/3800C/3850 Revision A
PRODUCT DESCRIPTION Basic Specifications 11
1.2 Basic Specifications
1.2.1 Basic Specifications
Note *: The all 9 ink cartridges can be installed simultaneously. The printer automatically switches
between Photo and Matte black depending on the driver selection while utilizing the same
physical ink channel. Note *: Includes margins that bleed off the edges of paper. (max. 5 mm for both home and the opposite
sides.)
Item Specifications
Maximum paper width 17 inch (43 cm)
Printing method On-demand ink jet method
Printing direction Two-way shortest distance printing with logical seeking
Print Head Type F-Mach
Number of nozzles 180 Nozzles per color (180 Nozzles x 8 colors)*
Ink
Type HCD2 + K3 (9 independent ink cartridges)*
Color of inks
Matte Black*, Photo Black*, Light Black, Light Light
Black, Cyan, Magenta, Yellow, Light Cyan, Light Magenta
(Refer to Table 1-1 for the alignment sequence of the
cartridges)
Maximum print resolution 2880 dpi x 1440 dpi
Smallest dot size 3.5 picoliters
Dot size Refer to Table 1-2
Printing function
Borderless printing
Silent paper feeding
Automatic bottom processing
L/4 x 6 Photo high-speed printing
Automatic adjustment function Auto nozzle check
Auto Bi-d adjustment
Printing
speed/area
Alphanumeric
characters Refer to Table 1-3
Graphic mode Refer to Table 1-4
Table 1-1. Cartridge Alignment Sequence
Row 1 Row 2 Row 3 Row 4 Row 5 Row 6 Row 7 Row 8 Row 9
Matte
Black
(MK)
Photo
Black
(PK)
Light
Black
(LK)
Light
Light
Black
(LLK)
Cyan
(C)
Magenta
(M)
Light
Cyan
(Lc)
Light
Magenta
(Lm)
Yellow
(Y)
Switched by an Ink
Selector
Table 1-2. Dot Size
Dot Size L (pl) M (pl) S (pl)
VSD1 22.2 13.8 6.6
VSD2 13.2 5.9 3.5
VSD3 -- -- 3.5
Economy 22.2 -- --
Table 1-3. Printing Speed and Area (Alphanumeric Characters)
Item Specifications
Character quality Fine
Character pitch 10 CPI
Printing area 167 digits
Printing speed 280 cps
Table 1-4. Printing Speed and Area (Graphic Mode)
Horizontal Resolution
(dpi) Maximum Printing Area*Printable Dots Printing Speed
360 441.8 mm (17.39 inch) 6,262 280 cps
720 441.8 mm (17.39 inch) 12,524 280 cps
1440 441.8 mm (17.39 inch) 25,047 280 cps
2880 441.8 mm (17.39 inch) 50,094 280 cps

EPSON Stylus Pro 3800/3800C/3850 Revision A
PRODUCT DESCRIPTION Basic Specifications 12
1.2.2 Electric Specifications
Note *: Shifting to low-power mode takes 15 min.
1.2.3 Environmental Characteristics
TEMPERATURE/HUMIDITY
Note "*1": Includes condition during transportation.
"*2": The combined temperature and humidity conditions must be within the blue-shaded range
shown in Figure 1-2.
"*3": Within 1 month under 40°C, within 120 hours under 60°C.
Figure 1-2. Temperature/Humidity Range
Item Specification
100/120V Model 220/240V Model
Rated voltage 100 to 120 VAC 220 to 240 VAC
Input voltage range 90 to 132 VAC 198 to 264 VAC
Rated frequency 50 to 60Hz
Input frequency range 49.5 to 60.5Hz
Rated current 0.6 A 0.3 A
Power
consumption
Operating Approx. 25 W Approx. 25 W
Low-power mode*Approx. 5 W Approx. 5.5 W
S/W turned OFF Approx. 0.3 W Approx. 0.4 W
Insulation resistance 10 M:or more
(between AC line and chassis at 500 VDC)
Dielectric strength 1.0 kVrms AC for 1 min. or 1.2 kVrms AC for 1 sec.
(between AC line and chassis)
Leak current 0.25 mA or less
Compliance with regulations
Conforms to International Energy Star Program
(Category: conforms to the harmonic restraint measure
guideline)
Conforms to VCCI Class B
Condition Temperature*2 Humidity*2
(non condensation)
Operating 10 to 35 °C 20 to 80 %
Storage*1before unpacking -20 to 60 °C*35 to 85 %
after unpacking -20 to 40 °C*35 to 85 %
32
60
80
55
20
10 15 25 27 35 40 Temperature (°C)
Humidity (%)
The printer
allowable range
Normal
ambient
environment

EPSON Stylus Pro 3800/3800C/3850 Revision A
PRODUCT DESCRIPTION Basic Specifications 13
RESISTANCE TO VIBRATION/SHOCK 1.2.4 Reliability/Durability
Note "*1": A4-sized paper, ECMA Pattern printing
"*2": Approx. 5% coverage
"*3": Total print time of 850 hours in normal ambient temperature, approx. 10% coverage.
(POH = Power on hours)
Vibration Shock
Operating 0.15G, 10 to 55Hz 1G, within 1ms
Storage 0.50G, 10 to 55Hz 2G, within 2ms
C A U T I O N When transporting the printer, the print head must be capped,
and the ink cartridges must be removed.
If the print head is not capped with the power turned off, turn
the printer on with the ink cartridges installed, then turn it off
after confirming the print head is capped.
Item Target
Operating life of the printer
Until any one of the following conditions is met.
• 12,000 pages (A2 plain paper fine mode)
• 1,600,000 paths (carriage movement)
•5years
MPBF Black: 300 pages or more*1
Color: 150 pages or more*2
MTBF 20,000 POH*3
(No faults with electronic parts and fans)
Battery life 5 to 10 years
Extension of normal TCL
generation time
4,320 hours (6 months) printing time within 2 hours
360 hours (15 days) printing time over 2 hours
Simultaneous use of CL timer T1
and FL timer Tf Execution
Periodical flushing Every 1 hour

EPSON Stylus Pro 3800/3800C/3850 Revision A
PRODUCT DESCRIPTION Printing Specifications 14
1.3 Printing Specifications
1.3.1 Paper Feed Specifications
1.3.2 Paper Feeder Specifications
EPSON Stylus Pro 3800/3800C/3850 support three types of paper feeding methods;
ASF, Rear Manual Feed, and Front Manual Feed. The paper size and thickness for each
of the methods are shown in the table below. For paper type and feeder capacity, refer
to "1.3.3 Paper Support" (p15).
Item Specification
Paper feed method Friction feed
Minimum pitch of paper feed 2.94 Pm (1/8640 inch)
Paper feed speed 25.4 mm (1 inch) when line feed: 333 msec (3 inch/sec)
Paper Feed
Method
Paper Size Thickness
(mm)
Width (mm) Length (mm) Standard paper
(mm)
ASF 89 to 431.8 127 to 950 L/4”x6” to A2/USC 0.08 to 0.27
Rear Manual Feed 210 to 431.8 279.4 to 950 A4/LTR to A2/USC 0.29 to 0.5
Front Manual Feed 210 to 420 279.4 to 594 A4/LTR to A2 1.2 to 1.5

EPSON Stylus Pro 3800/3800C/3850 Revision A
PRODUCT DESCRIPTION Printing Specifications 15
1.3.3 Paper Support
Note "*1": ASF = Auto Sheet Feeder
R.Manual = Rear Manual Feed
Front Manual Feed supports thicker paper (1.2 to 1.5mm thickness).
Paper loading capacity for both Rear and Front Manual Feed is one sheet.
"*2": User-defined sized paper (89 x 127mm to 432 x 950mm) is not available for borderless
printing.
"*3": Shows the supported black ink type
P: Photo Black
M: Matte Black
P/M: Both Photo and Matte Black are supported
Media Name Size (mm) Feeder
(capacity*
1
)
Borderless
print*
2
Black
Ink*
3
EAI EU Asia
Premium Glossy Photo
Paper
L (3R) (89 x 127) ASF (20) P
5” x 7” (127 x 178) ASF (20) P 
16:9 wide (102 x 148) ASF (20) P
8” x 10” (203 x 254) ASF (20) P
4” x 6” (102 x 152) ASF (20) P
11” x 14” (279 x 356) ASF (10) P
Letter (216 x 279) ASF (20) P
A4 (210 x 297) ASF (20) P 
A3 (297 x 420) ASF (10) P
S-B/A3+ (329 x 483) ASF (10) P  
A2 (420 x 594) ASF (1) P
USC (432 x 559) ASF (1) P
Premium Semigloss
Photo Paper
4” x 6” (102 x 152) ASF (20) P
Letter (216 x 279) ASF (20) P
A4 (210 x 297) ASF (20) P
A3 (297 x 420) ASF (10) P  
S-B/A3+ (329 x 483) ASF (10) P
A2 (420 x 594) ASF (1) P 
Premium Luster Photo
Paper
Letter (216 x 279) ASF (20) P
A3 (297 x 420) ASF (10) P
S-B/A3+ (329 x 483) ASF (10) P
USC (432 x 559) ASF (1) P  
Singleweight Matte
Paper S-B/A3+ (329 x 483) ASF (50) NA M 
Photo Quality Ink Jet
Paper
(KANZAN for EU A4
only, ESF for others)
A4 (210 x 297) ASF (100) NA P/M  
Letter (216 x 279) ASF (100) NA P/M 
Legal (216 x 358) ASF (50) NA P/M   
USB (279 x 432) ASF (50) NA P/M 
Proofing Paper
Semimatte
(Commercial
Semimatte)
S-B/A3+ (329x483) ASF (1) NA P  
Enhanced Matte Paper
(EAI)/Archival Matte
Paper
(EU, Asia)
Letter (216x279) ASF (20) M
A4 (210x297) ASF (20) M 
A3 (297x420) ASF (10) M
S-B/A3+ (329x483) ASF (10) M  
A2 (420x594) ASF (1) M
USC (432x559) ASF (1) M
Watercolor Paper-
Radiant White S-B/A3+ (329x483) R.Manual
(1) M
UltraSmooth Fine Art
Paper
A3+ (329x483) R.Manual
(1) M  
A2 (420x594) R.Manual
(1) M
USC (432x559) R.Manual
(1) M
Velvet Fine Art Paper
Letter (216x279) R.Manual
(1) M
S-B/A3+ (329x483) R.Manual
(1) M  
A2 (420x594) R.Manual
(1) M
USC (432x559) R.Manual
(1) M
Media Name Size (mm) Feeder
(capacity*
1
)
Borderless
print*
2
Black
Ink*
3
EAI EU Asia

EPSON Stylus Pro 3800/3800C/3850 Revision A
PRODUCT DESCRIPTION Printing Specifications 16
1.3.4 Printable Area
Note *: TM and BM are fixed to 20 mm in front manual feeding.
The printer detects the paper width when paper is set. (If the paper width detection
setting is OFF, the printer does not detect the paper width.)
The printer does not print the image exceeding the detected paper width and the
printable area that is specified in the paper setting. (If the paper width detection
setting is OFF, the printer may print on the platen.)
The top/bottom/left/right margins (TM, BM, LM, RM) can be set to zero under
special conditions.

Because the printer detects tilt of loaded paper in a range of 3 mm at both left and
right sides, an image bleeds off both left and right edges of paper by 3 mm each at
borderless printing. However, if the distance between the paper edges and the
platen (sponge width) is less than 3 mm, the bleeding margins are adjusted to less
than 3 mm (within the range of 0 mm
a 3 mm) not to directly print on the platen.
(Refer to "1.4.2 Borderless Printing" (p17), for the borderless print specification.)
Figure 1-3. Printable Area
Item Dimension
PW (paper width) 89mm to 431.8mm
PL (paper length) 127mm to 950mm
TM (top margin) 0mm/3mm/20mm*
BM (bottom margin) 0mm/3mm/20mm*
LM (left margin) 0mm/3mm
RM (right margin) 0mm/3mm
PW
LM RM
TM
BM
PL
Printable Area
Paper Feed Direction

EPSON Stylus Pro 3800/3800C/3850 Revision A
PRODUCT DESCRIPTION Print Mode 17
1.4 Print Mode
This section provides specifications of the print mode and borderless printing.
1.4.1 Print Mode
Note "*1": Driver not supported
"*2": Driver not supported (supports Out_bit_1 only)
1.4.2 Borderless Printing
AVAILABLE PAPER SIZE
The following table lists paper sizes in the order shown by the printer driver, and shows
the borderless printing availability.
Note *: The minimum user defined size is 3.5 x 5 in (89 x 127 mm), and the maximum size is 17 x 37.4
in (432 x 950 mm).
Media Type Print Quality Print Density
(H x V) Dot Size
Plain Paper Draft 360 x 360 dpi VSD1_Eco (280cps)
Normal (360 dpi) 720 x 360 dpi VSD1 (280cps)
Inkjet Paper
Normal (360 dpi) 720 x 360 dpi VSD1 (280cps)
Fine (720 dpi) 720 x 720 dpi VSD1 (280cps)
Super Fine (1440 dpi) 1440 x 720 dpi VSD2 (280cps)
Super Photo (2880 dpi) 2880 x 1440 dpi VSD3 (280cps)
-- ISV Square Resolution Mode 1440 x 1440 dpi VSD2 (280cps)*1
2880 x 2880 dpi VSD3 (280cps)*2
Table 1-5. Borderless Printing Available Paper Sizes
Paper Size Displayed by Driver Borderless Print
Letter (8 2/1 x 11 in) Available
Legal (8 2/1 x 14 in) NA
Half Letter (5 2/1 x 8 2/1 in) NA
US B (11 x 17 in) Available
US C (17 x 22 in) Available
A6 (105 x 148 mm) NA
A5 (148 x 210 mm) NA
A4 (210 x 297 mm) Available
A3 (297 x 420 mm) Available
Super A3 (329 x 483 mm) Available
A2 (420 x 594 mm) Available
B5 (182 x 257 mm) NA
B4 (257 x 364 mm) NA
B3 (364 x 514 mm) NA
89 x 127 mm (3.5 x 5 in) Available
102 x 152 mm (4 x 6 in) Available
127 x 178 mm (5 x 7 in) Available
16:9 wide (102 x 181 mm) Available
203 x 254 mm (8 x 10 in) Available
254 x 305 mm (10 x 12 in) Available
279 x 356 mm (11 x 14 in) Available
305 x 305 mm (12 x 12 in) NA
406 x 508 mm (16 x 20 in) Available
User Defined* NA
Table 1-5. Borderless Printing Available Paper Sizes
Paper Size Displayed by Driver Borderless Print

EPSON Stylus Pro 3800/3800C/3850 Revision A
PRODUCT DESCRIPTION Print Mode 18
AUTOMATIC EXPANSION SPECIFICATION
The driver automatically changes margins that bleed off the edges of paper according
to the paper size.
Note : The number of dots are based on 360 dpi.
PRINTABLE AREA
Figure 1-4. Printable Area
Note : Print start position can be shifted toward the home position by 8 m by changing the appropriate
setting.
Table 1-6. Borderless Printing Margins (Bleed)
L/4” x 6”
16:9 Wide
5” x 7”
8” x 10”
A4 / Letter
11” x 14”
A3/A3+ A2/USC
Top 1.34mm (19dot) 2.96mm (42dot) 3.32mm (47dot)
Left/Right 2.54mm (36dot) 3.46mm (49dot) 4.52mm (64dot)
Bottom 2.54mm (36dot) 4.02mm (57dot) 4.52mm (64dot) 5.01mm (71dot)
3.5m (max)
5mm (max)
5mm
(max)
Width-direction
printable area
Printable area
Paper width
Page control
coordinate origin
Printing position coordinate origin
Paper edge
Paper
feeding
direction
5mm
(max)
Length-direction
printable area
Bottom position

EPSON Stylus Pro 3800/3800C/3850 Revision A
PRODUCT DESCRIPTION Appearance Specifications 19
1.5 Appearance Specifications
This section describes external dimensions and parts names.
1.5.1 Dimensions/Weight
Figure 1-5. External Dimensions
Dimensions
Storage: 684 (W) x 376 (H) x 257 (D) mm
Printing: 684 (W) x 1040 (H) x 550 (D) mm
Weight
18.5 kg (excluding ink cartridges, including Maintenance cartridge)
19.8 kg (including ink cartridges)
1.5.2 Part Names
Figure 1-6. Parts Names
257 mm
550 mm
684 mm
90 mm
293 mm
376 mm
1040 mm
100 mm
Maintenance Cartridge Cover
Paper Support
AC Connector
USB Interface Connector
Network Interface Connector
Edge Guide
Auto Sheet Feeder
Paper Support Edge
Guide
Top Cover
Ink Cover
Board Paper Tray
Paper Eject
Tray Cover
Paper Eject
Tray
Operation Panel
Print Head (Nozzle)
Rear Paper
Feeder
Exhaust Outlet

EPSON Stylus Pro 3800/3800C/3850 Revision A
PRODUCT DESCRIPTION Operation Panel 20
1.6 Operation Panel
1.6.1 Buttons and Functions
Figure 1-7. Operation Panel
1.6.2 Buttons
Note "*1": The printer is always turned OFF regardless of operation status.
"*2": When turning the power ON while holding down the Cancel button, the maintenance mode
becomes activated. (Refer to
"1.6.7 Maintenance Mode" (p28) for details.)
"*3": Deactivated during printing.
1.6.3 LED
Note *: Alternately turns On and Off every 500 ms. In the case of maintenance call error, they light for 100
ms at intervals of five seconds.
Note : When a service call error occurs, all the LEDs flash.
Button
Functions
Normal One Press Hold Down for
3 Seconds
Function at the
Panel Setting
1 Power Turns the power ON or OFF*1 -- Power OFF
2Cancel/Reset*2
• Clears error
• Opens I/H Cover
(When the printer runs out of ink)
Cancels the job Interrupts panel setting
3Menu/Right
• During printing
Changes the panel display to the
Printer Status Menu
• When not printing
Shifts the printer into the Panel
Setting Mode
Runs a head
cleaning*3
Moves to the next
menu item (Descent)
4Back/Left -- -- Moves to the previous
menu item (Ascent)
5Ink Cover Open/
Up -- Unlocks the Ink Cover Set Value +
3
4 6
7
B
A1
2
5
Back/Left
Ink Cover Open/Up
Power
Cancel/Reset
Enter
Paper Feed/Down
Menu/Right
Power LED
Paper status LED
Ink status LED
C
6Paper Feed/
Down
• When paper is set
ASF: Ejects the paper
Manual-Rear: Backfeeds the paper
Manual-Front: Ejects the paper
• When paper is not set
ASF starts paper feeding
• When Manual-Front Tray Cover is
opened.
Manual-Front starts paper feeding
-- Set Value -
7Enter -- --
• Accepts the change
of setting
• Executes the
selected operation
• Saves the setting
LED Color Displays Status
Power Green
ON The power is ON.
Flashing*Receiving data, during printing, or executing power off
sequence.
OFF The power is OFF.
Paper status Red
ON Impossible to make a print due to the paper status.
Flashing*• A paper feeding or ejecting error is occurring.
• A maintenance call error is occurring.
OFF The papers are in normal condition without an error or
warning.
Ink status Red
ON An ink-related error is occurring.
Flashing*An ink-related warning is occurring.
OFF The inks are in normal condition without an error or
warning.
Button
Functions
Normal One Press Hold Down for
3 Seconds
Function at the
Panel Setting
A
B
C