SERVICE MANUAL Color Inkjet Printer EPSON Stylus CX3700/CX3800/CX3805/ CX3810/DX3800/DX3850 SEIJ05-012
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.
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.
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.
Revision Status Revision Issued Date A Aug 10, 2005 Description First Release
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A CONTENTS Chapter 1 PRODUCT DESCRIPTION Chapter 2 OPERATING PRINCIPLES 1.1 Overview ............................................................................................................... 9 1.1.1 Features......................................................................................................... 9 1.2 Specifications ......................................................................................................
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Chapter 4 DISASSEMBLY/ASSEMBLY Chapter 5 ADJUSTMENT 4.1 Overview ............................................................................................................. 93 4.1.1 Precautions.................................................................................................. 93 4.1.2 Tools ........................................................................................................... 93 4.1.
CHAPTER 1 PRODUCT DESCRIPTION
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 1.1 Overview Enlarge / Reduce factor can be selected from two options; actual size (100%) or “Fit to page”. This unit features 3-in-1 functionality (computer-connected printer, scanner, and standalone copy machine) and is designed for home/personal use. Its main functions are described below.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Print Direction 1.2 Specifications 1.2.1 Printer specifications Bi-directional minimum distance printing (with logic seeking) Print Resolution This section covers specifications of the printer. Table 1-2. Print Resolution Horizontal Direction (Across Columns) Vertical Direction (Paper Feed) Weight 360 dpi 120 dpi 360 dpi 360 dpi dpi* 720 dpi* 720 dpi* 720 dpi* 1440 dpi 720 dpi dpi* 720 dpi* 1.2.1.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 1.2.1.4 Paper Support Table 1-5. Graphics Mode (Border-free Printing) Cut sheets Horizontal Resolution Printable Area Max. Dot Count CR Speed 360 dpi* 215.05 mm (8.46") 3048 285 cps 720 dpi 215.05 mm (8.46") 6096 285 cps 1440 dpi 215.05 mm (8.46") 12192 285 cps Paper Size 2880 dpi 215.05 mm (8.46") 24384 285 cps Table 1-6.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Envelopes Exclusive papers Quality: EPSON Exclusive paper Table 1-7. Envelopes Paper Size No.10 *1 Dimensions Width Length 241.3 mm (9.5") 104.8 mm (4.125") *1 220 mm 110 mm C6 *1 162 mm 114 mm DL Note *1: C A U T IO N Thickness Weight Size Width (mm) Length (mm) Thickness (mm) Weight (g/m2) Premium Ink Jet Plain Paper*1 A4 210 297 0.11 80 Bright White Ink Jet Paper*1 A4 210 297 0.13 92.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 C A U T IO N Revision A Use paper under normal conditions. • Temperature 15 to 25°C (59 to 77°F) • Humidity 40 to 60% RH Poor quality paper may reduce print quality and cause paper jams or other problems. If you encounter problems, switch to a higher grade of paper. It is necessary that there is no wrinkle, nap, tear, fold, and so on in the form. The curve of form must be 5mm or below. 1.2.1.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Cut sheet (border-free printing) PW LM RM TM Printable area For paper width (PW) and paper length (PL), refer to “1.2.1.4 Paper Support” (p.11). Refer to the following table. As for each overhang area, refer to Figure 1-4 (p.15). Table 1-10.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 1-11. Applicable Paper/Printing Area (For Copying) Exclusive paper Premium Glossy Photo Paper Size Letter N/A N/A N/A N/A A4 N/A N/A N/A N/A 8” x 10” N/A N/A N/A N/A 5” x 7” N/A N/A N/A N/A 4” x 6” 2.54 2.54 2.96 5.08 3R 2.54 2.54 2.96 5.08 Letter N/A N/A N/A N/A A4 N/A N/A N/A N/A 4” x 6” 2.54 2.54 2.96 5.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Envelopes PL Printable area For paper width (PW) and paper length (PL), refer to “1.2.1.4 Paper Support” (p.11). Refer to the following table. As for each margin area, refer to Figure 1-5 (p.16). LM TM Table 1-12. Applicable Paper/Printing Area Printable area Left Margin Right Margin Top Margin Bottom Margin 5 mm (0.20") 5 mm (0.20") 3 mm (0.12") 20 mm (0.79") No.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Dimension: 1.2.1.6 Ink Cartridge Specification 12.7 mm (W) x 73.46 mm (D) x 55.25 mm (H) Type/color: EPSON-brand special ink cartridges Table 1-13.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 1.2.2 Scanner Specifications 1.2.2.3 Image Scanning Area Table 1-15. Image Scanning Area This section covers specifications of the scanner. RW OLM RL OTM 1.2.2.1 Basic Specifications (readable width) (out-of-range left margin) (readable length) (out-of-range top margin) Product type: Flatbed color image scanner 216 mm (8.5") 1.5 mm ± 1 mm 297 mm (11.7") 1.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 1.2.3 Common 1.2.3.2 Environmental Performance Table 1-17. Environmental Performance 1.2.3.1 Electric Specification Primary power input Table 1-16. Primary Power Input 100-120 V model 220-240 V model Rated power supply voltage (ACV) 100 ~ 120 220 ~ 240 Input voltage range (ACV) 90 ~ 132 198 ~ 264 0.4 A (max. 0.7 A) 0.2 A (max. 0.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 1.2.3.4 Acoustic Noise Noise level Approx. 45 dB (according to ISO7779 when for copying) 1.2.3.5 Safety Standards: EMC Table 1-18. Safety Standards: EMC 100-120 V version Safety standards EMI UL60950 CSA C22.2 No.60950 FCC part15 subpart B class B 220-240 V version EN 60950 EN 55022(CISPR Pub.22) class B CAN/CSA-CEI/IEC CISPR 22 Class B AS/NZS CISPR22 class B 1.2.3.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Connector signal layout 1.3 Interface Table 1-20. Connector Pin Assignment and Signals The EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 provides the following interface. Pin No. Signal name I/O Function Description Cable power. Max. power consumption is 2 mA. 1.3.1 USB Interface 1 VCC - 2 -Data Bi-D Data Standards 3 +Data Bi-D Data, pull up to +3.3 V via 1.5 K ohm resistor.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 1.4 Stand-alone Copy 1.4.1.2 Zoom Function The zoom function provides enlarged or reduced copies of originals. The either of the following can be selected from the operation panel. 1.4.1 Basic Specifications Actual (The state which “Fit to page” is not selected. It is the power-on default.) The zoom factor is set to 100%. 1.4.1.1 Supported Paper Sizes, Types and Qualities Table 1-22.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 1.4.2 Copy Speed Table 1-24.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 1.4.4 Relation between Original and Copy PL TM 1.4.4.1 Standard Copy BM The following table shows the relative positioning of the original and copy. Right side of copy Table 1-27. Original (scanner) RM OLM RL OTM (readable width) (out-of-range left margin) (readable length) (out-of-range top margin) 216 mm (8.5") 3 mm 297 mm (11.7") 3 mm PW Top Table 1-28.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 1.4.4.2 BorderFree Copy PL TO The following table shows the relative positioning of the original and copy. BO Table 1-29. Original (scanner) Right side of copy RW OLM RL OTM (readable width) (out-of-range left margin) (readable length) (out-of-range top margin) 216 mm (8.5") 1.5 mm ± 1 mm 297 mm (11.7") 1.5 mm ± 1 mm Table 1-30. Copy (printer) PW RO LO TO BO 2.5 mm 2.5 mm 3.0 mm 5.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 1.4.4.3 Small Margins Copy PL The following table shows the relative positioning of the original and copy. TM BM Table 1-31. Original (scanner) RW OLM RL OTM (readable width) (out-of-range left margin) (readable length) (out-of-range top margin) 216 mm (8.5") 1.5 mm ± 1 mm 297 mm (11.7") 1.5 mm ± 1 mm Right side of copy RM Table 1-32. Copy (printer) PW RM LM TM BM 1.5 mm 1.5 mm 1.5 mm 1.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 1.5 Control Panel 1.5.2 Indicators 1.5.1 Buttons The control panel contains following six LEDs, which are used to indicate various status. The control panel contains following seven buttons, which are used to set and execute various operations. All of them are non-lock type buttons. Table 1-33. Buttons Button Function Power Button Execute turning on/off this unit. Ink Button Execute exchanging ink cartridges or head cleaning.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Power Button Revision A Power LED Power LED Power Button Error LED Error LED Ink Button Ink LED Ink Button Ink LED Paper Size Button Paper Size LED 1,2 Paper Size Button Paper Size LED 1,2 Fit to Page Button Fit to Page LED Fit to Page Button Fit to Page LED B&W Start Button B&W Start Button Color Start Button Color Start Button Stop Button Stop Button Figure 1-14. Control Panel (For Europe and Asia) Figure 1-13.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 1.5.3 Operations 1.5.3.1 Stand-alone Copy The functions of this unit caused by each button in stand-alone copy mode are described in the following table. Table 1-35. Operations Function Button Stand-alone Copy Power Button • Turn on or off this unit. Ink Button • Start or advance ink cartridge (I/C) exchanging procedure. Case Move carriage (CR) to I/C exchange position. [All inks are enough.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 1.5.3.2 Low Power Panel Mode 1.5.3.3 Nozzle Check Pattern Print Without any panel operation for 15 minutes while the printer and scanner unit are in standby status, this unit moves into the low power panel mode in which power consumption for the panel decreases. This unit recovers from that mode by pushing any button but Power Button or printing/ scanning by the computer. This unit is turned off by pushing Power Button in that mode.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 1.5.4 Printer Condition and Panel Status Note : “---”: Blink: Blink 2: Blink 3: Reverse blink: Fast blink: Slow blink: Note *1: *2: No change 0.5sec. On + 0.5sec. Off repetition 0.2sec. On + 0.2sec. Off + 0.2sec. On + 0.4sec. Off repetition Blink on and off along with access to a memory card 0.5sec. Off + 0.5sec. On repetition (opposite of “Blink”) 0.2sec. On + 0.2sec. Off repetition 2.0sec. On + 2.0sec.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 1-37. Printer Condition and Panel Status Indicators Printer Status Paper Size LED Power LED Paper jam Error LED 1 2 Fit to Page LED Ink LED Priority — Blink Off — — — 7 On (1 sec.) On (1 sec.) On (1 sec.) On (1 sec.) On (1 sec.) On (1 sec.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 1.5.4.1 Error Status 1.5.5 Memory Functions Mechanical fatal error This error occurs when one of the followings happens. 1.5.5.1 Parameters that are retained when power is turned off • The carriage could not recognize the home position. • The carriage is put an unusual external force when the power is on. • The movement of the carriage is obstructed during printing. The following parameters are retained when the unit's power is off.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 1.5.6 Printer Initialization (T.B.D) There are four kinds of initialization method, and the following explains each initialization. 1. Power-on initialization This printer is initialized when turning the printer power on, or printer recognized the cold-reset command (remote RS command). When printer is initialized, the following actions are performed.
CHAPTER 2 OPERATING PRINCIPLES
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 2.1 Overview PF Encoder Sensor PF Scale This section describes the operating principles of the Printer Mechanism, Scanner Mechanism and Electrical Circuit Boards. Main Board C612 Main Board Power Supply Board CR Motor PF Roller C610 PSB/PSE Board Star Wheel PF Motor Panel Board C612 PNL Board Timing Belt 2.2 Printer Mechanism CR Encoder Sensor Carriage Unit LD Roller 2.2.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 2.2.2 Print Head The Print Head is the same D2-CHIPS type as the previous SPC, and makes it possible to perform economy dot printing and variable dot printing. The Print Head nozzle configuration is as follows. Nozzle layout Black : 90 nozzles x 1 row Color : 29 nozzles x 3 row/color (Cyan, Magenta, Yellow) The nozzle layout when viewed from the back surface of the Print Head is shown below. 2.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Ink Cavity The ink absorbed from the Ink Cartridge goes through the filter and then is stored temporarily in this tank called “ink cavity” until PZT is driven. Ink path PZT Ink cavity Normal state Electric poles for CSIC Needle Ink cartridge Nozzle Nozzle plate PZT drive voltage Nozzle selector board Filter CSIC Memory chip * Head ID for the Print Head is stored to the EEPROM.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 2.2.3 Carriage Mechanism The Carriage Mechanism consists of Carriage Unit (including the Print Head, CR Encoder Board and PW Sensor), CR Motor, Timing Belt and CR Scale etc. Following figure shows you each component for the CR Mechanism. The above control and sequences correct the drive current value of the CR Motor according to not only the mechanical load but also the variations of the motor and like.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 2.2.3.2 Carriage Home Position Detection 1. Current position temporary detection sequence determines if the carriage is in the carriage lock position and releases the carriage if it is locked. 2. The carriage is moved to the left frame hit position and the carriage motor is stopped. 3.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 2.2.4 Paper Loading/Feeding Mechanism Item Description The drive of the PF motor is transmitted to the LD roller shaft and the PF roller through gears for the Paper loading/feeding mechanism. The Paper loading mechanism plays a role in loading a paper from the ASF unit to the PF roller. And also, the Paper feeding mechanism plays a role in feeding a paper loaded from the ASF unit.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A For your reference, the top or the end of a paper is usually detected with the PE Sensor. In case that the PE Sensor cannot detect the top of a paper in the paper loading sequence, the printer indicates the “Paper Out error”. If the PE Sensor cannot detect the end of a paper in the paper feeding sequence, the printer indicates the “Paper Jam error”. As for the details, refer to Chapter 3 “Troubleshooting”. 2.2.4.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 When the PF Motor pinion gear rotates CCW direction (right side view), the Change Lever pushes down the Clutch lever as right figure and the Clutch lock tooth is disengaged from the Clutch Gear. As the result, the LD Roller Shaft dose not rotate at all because the drive of the PF Motor is not transmitted.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 The PF Motor pinion gear rotates CCW direction (right side view), and the drive of the PF Motor is transmitted to the LD Roller Shaft through the Clutch lock tooth and the Clutch gear. After the LD Roller pushes down the Paper Back Lever into the ASF Frame, the Hopper is released by the tension force of the Compression Spring 5.58. And, a paper is picked up with the frictional force between the LD Roller and the Pad Hopper.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 2.2.4.2 Paper Feeding Mechanism Following figure shows you the transmission path for the PF Roller & the Paper Guide Roller and the EJ Roller & the Star Wheel. The Paper feeding mechanism consists of PF Motor, PF Roller, EJ Roller, PE Sensor, PF Encoder and PF Scale etc. The Paper feeding mechanism feeds a paper loaded from ASF Unit by using pairs of rollers. 1.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 2.2.5 Ink System Mechanism The Ink System Mechanism consists of Pump mechanism with Carriage lock mechanism and Capping mechanism with Wiper mechanism. Following table lists the function for each mechanism. Table 2-4. Function for each mechanism Mechanism Capping mechanism * Function This is to cover the surface of the Print Head with the cap in order to prevent the nozzle from increasing viscosity.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 2.2.5.1 Capping Mechanism The Capping mechanism covers the Print Head with the Cap to prevent the nozzle from increasing viscosity when the printer is in stand-by state or when the printer is off. When the Carriage Unit is in the home position, the hook of the Slider Lock Lever is not latched to the dent of the Cap Frame. In this time, the protrusion of the Cap Slider Lever does not reach the rightmost position of the Cap Frame.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 2.2.5.2 Pump Unit Mechanism 1. The PF Motor also controls the Pump Unit mechanism (including the Change Lever) as well as the Paper loading/feeding mechanism. The drive of the PF Motor is always transmitted to the Pump Unit. (And also, its drive is transmitted to the LD Roller through the Clutch mechanism & the Change Lever.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 2. Revision A Carriage lock operation by the Change Lever Unlike the previous printer (Stylus COLOR 680), this printer does not have the Carriage Lock Lever with the Wiper. Instead of the Carriage Lock Lever, the Change Lever is set to the front side of the printer while the Carriage Unit is in the CR home position. (As for the detailed mechanism for setting the Change Lever, refer to Figure 2-7 (p.43) Step 2) 2.2.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Independently of the printing path after the previous CL, perform manual CL from CL1 to CL3 in order if the cumulative printing timer counter is less than 9min. Only when the cumulative printing timer counter is more than 9min, execute only CL1. Additionally, if the I/C is Ink Low or Out condition, any manual cleaning is prohibited and it is displayed on the LED indicators.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 2.3 Scanner Mechanism Scanner HP Sensor Scanner Carriage Shaft Scanner Carriage Unit The Scanner Mechanism of Stylus CX3700/CX3800/CX3805/CX3810/DX3800/ DX3850 is constructed of a Scanner Carriage Unit, Scanner Motor, Scanner HP Sensor, etc., in the same way as previous A4 size scanners. 2.3.1 Scanner Carriage Mechanism 2.3.1.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 2.3.1.2 Scanner Carriage Unit Movement Overview Scanning image is performed in the main scan direction (=1 line) by the CCD sensor and in the sub-scan direction (=several lines) combined with Scanner Carriage Unit movement. (refer to the figure below) Line type, color CCD sensor can scan 1 line in main scan direction (parallel to the Scanner Carriage Unit) by one time.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 2.4 Electrical Circuit Operating Principles The electric circuit of the Stylus CX3700/CX3800/CX3805/CX3810/DX3800/ DX3850 consists of the following boards. Main Board (CPU-ASIC 2 in 1 + Soldering Flash ROM) 2.4.1 PSB/PSE Board In the PSB/PSE Board of Stylus CX3700/CX3800/CX3805/CX3810/DX3800/ DX3850, the simulated oscillating stimulation flyback converter circuit method is used, and it supplies +42VDC to the drive line.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 2.4.2 C612 Main Board 2.4.2.1 Main Elements The logic circuit of the C612 Main Board is composed of the follows; Table 2-9 (p.54) shows the function of the each main elements on C571/577 Main Board.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Flash-ROM (IC5) CN8 CR Motor CN9 PF Motor CN10 Scanner Motor Data Motor Driver (IC9) Address SDRAM (IC6) RTC (IC7) CIS Unit CN11 CPU-ASIC 2 in 1 (IC8) P1 PF Encoder Sensor CN3 PE Sensor AD Converter (IC12) C612 Panel Board Scanner HP Sensor CN12 CN13 Head Driver (IC11) CN5 USB (CN2) C610 PS Board Print Head Q9, Q10 CN6 CN7 CR Encoder Sensor CN1 CSIC Board Figure 2-18.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 2.4.2.2 Print Head Driver Circuit The Print Head driver circuit consists of the following two components: Head common driver circuit (Common driver IC11 & Wave amplifier transistor Q9, Q10) Nozzle selector IC on the Print Head driver The common driver (IC11) generates a basic drive waveform according to the output signals from CPU (IC8).
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 2.4.2.3 Motor Driver Circuit CPU (IC8) CR/PF Motor drive circuit The motor driver IC (IC9) on the Main board drives CR/PF Motor. This product uses DC motor and performs constant current PWM drive. Based on the output pulse (signal) from CR Encoder or PF Encoder, the CPU (IC8) sets the appropriate drive current value for each operational action and outputs the value as a special control signal to the Motor Driver (IC9).
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 2.4.2.4 Combination Circuit Revision A RTC Circuit This printer differs from previous models by using a combination IC that integrates the reset circuit, EEPROM and RTC. By adoption of the large-capacity capacitor (C9) for timer, the Power-off timer can be backed up for about one week after power-off. Reset Circuit RTC IC (IC7) on the Main Board monitors the three voltage: +3.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 2.4.2.5 Sensor Circuit CPU (IC8) on the Main Board monitors the status of the printer by several sensors. However, unlike the previous product, ASF Unit on this printer does not have ASF Sensor. Instead of ASF Sensor, Change Lever and the Clutch mechanism is used to detect ASF home position. (As for the ASF home position detection, refer to “2.2.4 Paper Loading/Feeding Mechanism” (p.41).
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A The block diagram for the sensor circuit is shown below. : +3.3V CN3 PE Sensor PEV 3 GND 2 PE 1 +3.3V CPU (IC8) +3.3V_SN D5 PE DACDAT CO CCLK CDIO CXRST D13 A10 B12 B11 A11 5 1 6 2 3 CVDD COI CSCK CSDA CRST • CR Encroacher Sensor • CSIC +3.3V_SN EA_CR B10 EB_CR A9 CN7 11 ENCA 9 ENCB +3.3V CN4 Scanner HP Sensor PEV 3 GND 2 SCN_HP 1 +3.3V_SN PF Encoder (P1) F20 SCNHP EA_PF A16 EB_PF B16 +3.3V VOA VOB +3.
CHAPTER 3 TROUBLESHOOTING
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 3.1 Overview Table 3-2. Sensor check point Sensor name This chapter describes unit-level troubleshooting. Refer to the flowchart in this chapter to identify the defective unit and perform component level repair if necessary. This chapter also explains motor coil resistance, sensor specification and error indication.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-3. Error Indications and Fault Occurrence Causes Printer Status Power Error Ink Indications 7-seg. Paper Size 1 2 Fit to Page Communication error — — — — — — — Ink low — — Blink — — — — Double feed — On Off — — — — Paper out — On Off — — — — This error is detected at resending of paper for double-sided printing when paper length is determined to be other than default value.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-4. Error Indications and Fault Occurrence Causes Printer Status Power Error Ink Indications 7-seg. Paper Size 1 2 Fit to Page Ink out or No Ink cartridge — Off On — — — — CSIC error — Off On — — — — Incorrect I/C — Off On — — — — Paper jam — Blink Off — — — — Status monitor 3 message This error is detected when; • The ink consumption amount reaches 100%. • The ink cartridge is defective.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-5. Error Indications and Fault Occurrence Causes Printer Status Power Error Ink Indications 7-seg. Paper Size 1 2 Fit to Page Maintenance request Blink On On “E” blink Blink Blink Blink Fatal error (Mechanism) Blink Blink Blink “E” blink Blink Blink Blink Status monitor 3 message Fault Occurrence Cause Note : “–” This error is detected when the Waste Ink Counter exceeds the preset counter value.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 3.3 Troubleshooting You can identify the troubles by using the checklist in this section after confirming the LED indication on the SPC. If you connect the SPC to your PC and see an error message on the STM3, you can short the total repair time. And, when you find out the defective parts, replace them by referring the Chapter 4 “DISASSEMBLY AND ASSEMBLY”. The following tables describe the error check points. Table 3-6.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-6. Check point for the communication error according to each phenomenon Occurrence timing CR position Detailed phenomenon Defective unit/part name Check point Remedy 1. Check if the PS Board Connector Cable is connected to the CN10 on the Main Board. 1. Connect the PS Board Connector Cable to CN1 on the Main Board. Main Board CN1 • Power on • Anywhere When turning on the power, the SPC does not operate at all.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-7. Check point for the error before the initial ink charge according to each phenomenon Occurrence timing CR position • Power on • Inside HP • Power on • Anywhere Detailed phenomenon The SPC does not perform the initial ink charge and an error is indicated with LEDs and STM3. The SPC does not perform the ink replacement CL and an error is indicated with LEDs and STM3.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-8. Check point for the Double feed error according to each phenomenon Occurrence timing CR position Detailed phenomenon Defective unit/part name Check point 1. Check if the Extension Spring Retard operates correctly in the paper loading sequence. Remedy 1. Set the Extension Spring Retard between the Retard Roller Unit and the ASF Frame.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-9. Check point for the paper out error according to each phenomenon Occurrence timing CR position Detailed phenomenon Defective unit/part name Check point Remedy 1. Check if any paper dust is not adhered to the surface of the LD Roller. LD Roller • Operation • – The LD Roller cannot pick up paper although the LD Roller attempt to rotate correctly. Holder Shaft Unit 1. Set a cleaning sheet in the ASF Unit up side down.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-9. Check point for the paper out error according to each phenomenon Occurrence timing CR position Detailed phenomenon Defective unit/part name Check point Remedy 1. Check if the Extension Spring 0.143 does not come off in the Clutch mechanism. 1. Reassemble the Extension Spring 0.143 in the Clutch mechanism. Extension Spring 0.143 • Operation • – The drive of the PF Motor is not transmitted to the LD Roller Shaft.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-9. Check point for the paper out error according to each phenomenon Occurrence timing CR position • Operation • – Detailed phenomenon The drive of the PF Motor is not transmitted to the LD Roller Shaft. Defective unit/part name Check point Remedy 1. Check if the Compression Spring 2.36 does not come off in the Change Lever. 1. Replace the Ink System Unit with a new one. Ink System Unit Change Lever Compression Spring 2.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-10. Check point for the No ink cartridge/CSIC error/Incorrect ink cartridge according to each phenomenon Occurrence timing CR position Detailed phenomenon Defective unit/part name Check point Remedy 1. Check if Ink Cartridge is properly installed. 1. Install the Ink Cartridge properly. 2. Check if the Memory Chip is not disconnected or not chipped. 2. Replace the Ink Cartridge with a new one. Ink Cartridge Memory Chip 1.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-11. Check point for the paper jam error according to each phenomenon Occurrence timing CR position Detailed phenomenon Defective unit/part name Check point Remedy 1. Check if the ASF Unit is properly installed. 1. Install the ASF Unit properly. 2. Check if the Paper Back Lever operates correctly in the paper loading sequence. 2. Set the Torsion Spring 6.45 between the ASF Frame and the Paper Back Lever. Torsion Spring 6.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-11. Check point for the paper jam error according to each phenomenon Occurrence timing CR position Detailed phenomenon Defective unit/part name Check point 1. Check if the Extension Spring Retard operates correctly in the paper loading sequence. Remedy 1. Set the Extension Spring Retard between the Retard Roller Unit and the ASF Frame. Extension Spring Retard Paper is being resent during paper feeding operation.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-11. Check point for the paper jam error according to each phenomenon Occurrence timing CR position Detailed phenomenon Defective unit/part name Check point 3. Check if the Star Wheel Holders does not come off. Star Wheel Holders The leading edge of paper does not go through between the EJ Roller Unit and the Star Wheel. Remedy 3. Reassemble the Star Wheel Holders correctly. EJ Frame Unit** • Operation • – 4.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-12. Check point for the Fatal error according to each phenomenon Occurrence timing CR position Detailed phenomenon Defective unit/part name Check point Remedy 1. Check if the Scanner Motor Connector Cable is connected to CN10 on the Main Board. 1. Connect the Scanner Motor Connector Cable to CN10 on the Main Board.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-12. Check point for the Fatal error according to each phenomenon Occurrence timing CR position Detailed phenomenon Defective unit/part name Check point Remedy 1. Check if the Scanner HP Sensor Connector Cable is connected to CN13 on the Main Board. 1. Connect the Scanner HP Sensor Connector Cable to CN13 on the Main Board. CN13 Scanner HP Sensor Connector Cable Scanner HP Sensor 2.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-12. Check point for the Fatal error according to each phenomenon Occurrence timing CR position Detailed phenomenon Defective unit/part name Check point Remedy 1. Check if the Scanner Carriage Unit is not damaged. • Power on • Anywhere The Scanner Unit does not initialize when the power is turned on. Scanner Carriage Unit 1. Replace the Scanner Carriage Unit with a new one. Scanner Carriage Unit 1.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-12. Check point for the Fatal error according to each phenomenon Occurrence timing CR position Detailed phenomenon Defective unit/part name PF Motor • Power on • Anywhere When turning on the power, the Carriage Unit collides to the Change Lever located to the front side of the printer. Check point Remedy 1. Check if the PF Motor Connector Cable is connected to CN9 on the Main Board. 1.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-12. Check point for the Fatal error according to each phenomenon Occurrence timing CR position Detailed phenomenon Defective unit/part name Check point Remedy 1. Check if the CR Scale does not come off or it properly passes through the slit of the CR Encoder Board. 1. Reassemble the CR Scale correctly. * If the problem is not solved, replace the Main Board with a new one. Slit of the CR Encoder Board CR Scale 2.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-12. Check point for the Fatal error according to each phenomenon Occurrence timing CR position Detailed phenomenon Defective unit/part name Check point 1. Check if the PF Scale is not damaged or contaminated. Remedy 1. Replace the PF Scale with a new one. PF Encoder Sensor • Power on • Anywhere • Operation • Anywhere The eject rollers are rotating at high speed when power is turned on. (For about 1 cycle.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-12. Check point for the Fatal error according to each phenomenon Occurrence timing CR position Detailed phenomenon Defective unit/part name Check point 1. Check if the Slider Lock Lever is correctly released by the CR movement. • Operation • Anywhere The Carriage Unit climbs over the Slider Lock Lever set to the wiping position and the Carriage Unit collides to its lever. 1. Replace the Front Frame with a new one.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 3.3.1 Superficial Phenomenon-Based Troubleshooting This section explains the fault locations of the error states (print quality and abnormal noise) other than the error states (LED and STM3) in the previous section. Table 3-13. Check point for multiple sheets of paper are always loaded without LEDs and STM3 Occurrence timing CR position Detailed phenomenon Defective unit/part name Check point 1.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-14. Check point for the abnormal noise Occurrence timing CR position • Anywhen • Anywhere Detailed phenomenon The abnormal noise occurs at the first power on timing and during each operation although the printing operation is performed. Defective unit/part name Remedy Carriage Unit 1. Check if the grease on the Carriage Guide Shaft is sufficient. 1.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-16. Check point for the poor printing quality Print Quality State Detailed phenomenon Defective unit/part name Check point Remedy 1. Check if there is not any foreign material/damage around the seal rubber part on the Cap Unit. 1. Remove the foreign material around the seal rubber parts carefully. Seal rubber part Ink is scarcely ejected to the Cap from the Print Head.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-16. Check point for the poor printing quality Print Quality State Detailed phenomenon Defective unit/part name Check point Remedy 1. Check if the Head FFC is securely connected to the Print Head Connectors and the Main Board Connectors (CN5, CN6, CN7). 1. Connect the Head FFC to the Print Head and the Main Board Connectors.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-16. Check point for the poor printing quality Print Quality State Detailed phenomenon Defective unit/part name Check point Remedy Adjustment 1. For printing in the Bi-D mode, check if Bi-D Adjustment has been performed properly. 1. Perform Bi-D Adjustment to eliminate displacements between the upper and lower rules. (Refer to Chapter 5 “ADJUSTMENT”.) 1. Check if each segment is printed correctly in the Nozzle Check Pattern.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-16. Check point for the poor printing quality Print Quality State Detailed phenomenon Micro banding appears horizontally against the CR movement direction and it appears with the same width. Defective unit/part name Check point Remedy Printer driver & exclusive paper 1. Check if the suitable paper is used according to the printer driver setting. 1. Use the suitable paper according to the printer driver setting. 1.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-16. Check point for the poor printing quality Print Quality State Detailed phenomenon Defective unit/part name Check point 1. Check if any paper dust is not adhered to the surface of the LD Roller. LD Roller • Print start position slip The printing operation is correctly performed. But, the top margin is insufficient than usual one. Holder Shaft Unit 1. Check if the Paper Guide Front Unit does not have the ink stain.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 3-16. Check point for the poor printing quality Print Quality State Detailed phenomenon Defective unit/part name Print Head Paper Guide Upper Unit Ink sticks to other than the print area of • Ink stain of paper the paper, resulting in contamination Check point Remedy 1. Check if the Print Head Cover does not have the ink drop. 1. Clean the Print Head Cover carefully with a soft cloth. 1.
CHAPTER 4 DISASSEMBLY/ASSEMBLY
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 4.1 Overview C A U T IO N This section describes procedures for disassembling the main components of the Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850. Unless otherwise specified, disassembly units or components can be reassembled by reversing the disassembly procedure. Things, if not strictly observed, that could result in injury or loss of life are described under the heading “Warning”.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 4.1.3 Work Completion Check Table 4-2. Work Completion Check If any service is made to the printer, use the checklist shown below to confirm all works are completed properly and the printer is ready to be returned to the user. Classification Scanner unit Part Mechanism Table 4-2.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 4.2 Caution regarding Assembling/Disassembling of the Printer Mechanism, and How to Ensure of Quality on Re-assembled Product On current low end models, we basically forbade to remove Housing Lower from Printer Mechanism in your repair. This is because there is a possibility of Main Frame deformation when a part (such as Ink System Unit) is removed from Printer Mechanism without Housing Lower.
Revision A E P SON Stylu s CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 4.3 Disassembly Procedures The flowchart below shows step-by-step disassembly procedures. When disassembling each unit, refer to the page number shown in the figure. START “4.4.1 Document Cover/Document Cover Mat/ASF Cover” (p97) “4.4.2 Paper Support Assy.” (p98) “4.4.5 Panel Unit” (p100) “4.4.4 Scanner Unit” (p99) “4.4.3 Stacker Assy.” (p98) “4.5.1 Scanner Housing, Upper” (p129) “4.4.6 Housing, Upper” (p101) “4.5.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Part/Unit that should be removed before removing Document Cover/ Document Cover Mat/ASF Cover 4.4 Printer Section 4.4.1 Document Cover/Document Cover Mat/ASF Cover Document Cover Guide Pin Pin Guide Guide Pin None Removal procedure Document Cover 1. Open the Document Cover, release the guide pins (x2, Document Cover, and remove the Document Cover. Document Cover Mat 1.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 4.4.2 Paper Support Assy. 4.4.3 Stacker Assy. External view External view Housing, Lower Paper Support Assy. Housing, Upper Stacker Assy. Guide Pins Right Side Left Side Figure 4-3. Removing Paper Support Assy. Part/Unit that should be removed before removing Paper Support Assy. None Removal procedure 1. Release the guide pins (x2, ) that secure the Paper Support Assy, and remove the Paper Support Assy.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Part/Unit that should be removed before removing Scanner Unit 4.4.4 Scanner Unit Document Cover External view (1) Removal procedure USB Cover 1. 2. 1 3. 2 FFC Shield Plate CN11 C A U T IO N Main Board Unit Main Board Release the tabs (x2, 1 2 ) that secure the USB Cover with a precision screwdriver (-), and remove the USB Cover. Remove the screw (x1, ) that secure the FFC Shield Plate, and remove the FFC Shield Plate.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Part/Unit that should be removed before removing Panel Unit 4.4.5 Panel Unit Document Cover External view Removal procedure Panel FFC C A U T IO N 1. CN12 When performing the following work, be careful not to bend the tabs (x2, ) of the Panel Unit.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Part/Unit that should be removed before removing Housing, Upper 4.4.6 Housing, Upper Document Cover / Paper Support Assy. / Scanner Unit / Panel Unit External view Removal procedure Tabs 5 1. 2. 1 ) that secure the Housing, Upper. Remove the screws (x7, Release the tabs (x2) that secure the Housing, Upper with a flathead screwdriver or a similar tool, and lift up to remove the Housing, Upper.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Part/Unit that should be removed before removing Print Head 4.4.7 Printhead Document Cover / Paper Support Assy. / Scanner Unit / Panel Unit / Housing, Upper External view Removal procedure Carriage Unit 1. Carriage Lock 2. Release the Carriage Lock with a flathead screwdriver or a similar tool, and move the Carriage Unit to the center of the printer. Remove all the Ink Cartridges from the Carriage Unit.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A When installing the Printhead to the Carriage Unit, match the guide pins (x2, ) of the Carriage Unit with the positioning holes (x2) of the Printhead. Tighten the screws in the order as shown in the figure. When installing the Sub FFC Guide, insert the rib of the Sub FFC Guide to the notch of the Carriage Unit as shown below. Rib Figure 4-10.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Part/Unit that should be removed before removing Printer Mechanism 4.4.8 Printer Mechanism Document Cover / Paper Support Assy. / Scanner Unit / Panel Unit / Housing Upper External view (1) Tabs Rear Cover Removal procedure Waste Ink Tube Red Line 1. Remove the screw (x1, Cover. C A U T IO N C.B.P.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A External view (2) 4. 5. 3 1 Remove the screws (x6, ) that secure the Printer Mechanism. Disconnect the PS Connector Cable from the connector (CN1) of the Main Board. C A U T IO N 2 Hold the designated position and lift Printer Mechanism upward when performing the following step in order to prevent warping of Main Frame. 4 6. Lift up the Printer Mechanism, and remove the whole Printer Mechanism from the Housing, Lower.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 W A R N IN G Revision A When installing the Printer Mechanism to the Housing, Lower, insert the Waste Ink Tube to the Eject Ink Joint and securely fasten the Waste Ink Tube with the Tube Clamp, or ink may leak from the Tube. The assembled accuracy of each part composed of Printer mechanism is based on Housing Lower.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Part/Unit that should be removed before removing PS Board Unit 4.4.9 PS Board Unit Document Cover / Paper Support Assy. / Scanner Unit / Panel Unit / Housing Upper / Printer Mechanism External view Rib C.B.P. 3x10 F/Zn (4±1kgfcm) Acetate Tapes Removal procedure 1. 2. Peel off the acetate tapes (x2) that secure the PS Connector Cable. Remove the screw (x1, ) that secures the PS Board Unit, and remove the PS Board Unit.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 4.4.10 Waste Ink Pads/Stacker Lock/Rubber Feet External view (1) Tube Clump Revision A Part/Unit that should be removed before removing Waste Ink Pads/Stacker Lock/Rubber Feet Document Cover / Paper Support Assy. / Stacker / Scanner Unit / Panel Unit / Housing, Upper / Printer Mechanism Removal procedure Waste Ink Tube and Groove Eject Ink Joint Waste Ink Pads Removal 1.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A When installing the Waste Ink Pads, be sure to follow the steps below. Step 1 When installing the Waste Ink Tube to the Housing, Lower, insert the Waste Ink Tube to both the groove of the Housing, Lower and the Eject Ink Joint and securely fasten the Waste Ink Tube with the Tube Clamp, or ink may leak from the Tube. 2 1 3 A D J U S T M E N T R E Q U IR E D After replacing the Waste Ink Pads, perform the following adjustment.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A External view (2) Right Side Compression Spring 5.1 Stacker Lock Removal 1. Remove the tabs (x2, ) that secure the Stacker Lock, and remove the Stacker Lock and Compression Spring 5.1 from the Housing, Lower. Tabs Pass the shaft of the Stacker Lock through the groove of the Housing Lower. Shaft and Groove Right Side Stacker Lock Figure 4-18.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Part/Unit that should be removed before removing Main Board Unit 4.4.11 Main Board Unit Document Cover / Paper Support Assy. / Scanner Unit / Panel Unit / Housing, Upper / Printer Mechanism External view Removal procedure Main Board Unit Acetate Tapes 1. CN3 CN5 CN6 CN7 2. CN8 PE Sensor Connector Cable CN9 PF Scale C.B.S. 3x6 F/Zn (7±1kgfcm) 3. PF Encoder Sensor Slit 1 C.B.S.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A PF Scale Sensor positioning adjustment Use the following procedure to confirm that the PF Scale is positioned in the center of the PF Encoder Sensor. 1. Test fit the Main Board Unit, and confirm whether or not the PF Scale is positioned in the center of PF Encoder Sensor. 2. If the PF Scale is positioned in the center of the PF Encoder Sensor, adjustment is complete.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Part/Unit that should be removed before removing ASF Unit 4.4.12 ASF Unit Document Cover / Paper Support Assy. / Scanner Unit / Panel Unit / Housing, Upper / Printer Mechanism External view (1) Shield Plate Main Board Unit Acetate Tapes Revision A Removal procedure Tab CR Motor Connector Cable 1. 2. 3. ASF Unit PE Sensor Connector Cable 4.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A External view (2) 5. 6. Hopper Pad Hopper Open the Hopper, and remove Compression Spring 5.58. Remove the washer that secures the left shaft of the Paper Back Lever. Ribs C A U T IO N 7. Compression Spring 2.51 Retard Roller ASF Unit Do not touch the Retard Roller and the Hopper Pad. Bend the Paper Back Lever, release the guide pins (2 each, ) on both ends from the ASF Unit, and remove the Paper Back Lever and Torsion Spring 6.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Part/Unit that should be removed before removing Holder Shaft Unit Document Cover / Paper Support Assy. / Scanner Unit / Panel Unit / Housing Upper / Printer Mechanism / ASF Unit Removal procedure 1. Slide the Carriage Unit to the center of the printer. 2. Disconnect the PE Sensor Connector Cable from the connector (CN3) of the Main Board. 3. Remove the screw (x1, ) that secures the Holder Shaft Unit. 4.4.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Part/Unit that should be removed before removing Spur Gear 36.8/Extension Spring 0.143/Clutch 4.4.14 Spur Gear 36.8/Extension Spring 0.143/Clutch External view Paper Block Document Cover / Paper Support Assy. / Scanner Unit / Panel Unit / Housing, Upper / Printer Mechanism / ASF Unit / Holder Shaft Unit Ribs Cam Removal procedure 1.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 4.4.15 PE Sensor Board/PE Sensor Lever External view Groove L-shaped Tip Torsion Spring 0.22 2 1 Shaft Shaft Straight Tip PE Sensor Lever PE Sensor Connector Cable Revision A Part/Unit that should be removed before removing PE Sensor Board/ PE Sensor Lever Document Cover / Paper Support Assy. / Scanner Unit / Panel Unit / Housing, Upper / Printer Mechanism / ASF Unit / Holder Shaft Unit / Spur Gear 36.8 / Extension Spring 0.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Part/Unit that should be removed before removing CR Guide Frame Document Cover / Paper Support Assy. / Scanner Unit / Panel Unit / Housing, Upper / Printer Mechanism / Main Board Unit Removal procedure 1. Release the Head FFCs (x3) secured with the double-sided tape (x1) from the CR Guide Frame. 2. Remove the screws (x2, ) that secure the CR Guide Frame, and remove the CR Guide Frame from the Printer Mechanism. 4.4.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Part/Unit that should be removed before removing CR Motor 4.4.17 CR Motor Document Cover / Paper Support Assy. / Scanner Unit / Panel Unit / Housing, Upper / Printer Mechanism / Main Board Unit / CR Guide Frame External view Removal procedure Acetate Tape 1. 2. 3. 4. Slide the Carriage Unit to the center of the printer.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Part/Unit that should be removed before removing PF Motor 4.4.18 PF Motor Document Cover / Paper Support Assy. / Scanner Unit / Panel Unit / Housing, Upper / Printer Mechanism / Main Board Unit External view CR Motor Removal procedure Acetate Tape Spur Gear 30.8 PF Scale 1. 2. Doublesided Tape Spacer (5.2x0.8x9) Ferrite Core and Slot 3. 4. Spur Gear 32.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Part/Unit that should be removed before removing Carriage Unit/ CR Encoder Board/PW Sensor Board/Head FFC 4.4.19 Carriage Unit/CR Encoder Board/PW Sensor Board/Head FFC Document Cover / Paper Support Assy. / Scanner Unit / Panel Unit / Housing Upper / Printer Mechanism / Main Board Unit / CR Guide Frame / CR Motor External view (1) Slit of CR Encoder Sensor Removal procedure Carriage Unit Removal 1.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A External view (2) CR Guide Shaft 6. Parallel Adjustment Lever (Left) Right Side Tab 7. 8. CR Guide Shaft Pressing Spring C.B.S.(P2) 3x6 F/Zn (7±1kgfcm) Guide Pin Remove the screw (x1, ) that secures the Parallel Adjustment Lever (Left), and remove the Parallel Adjustment Lever (Left) from Main Frame while lifting left end of the Carriage Guide Shaft upward.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A External view (3) CR Encoder Board CR Encoder Removal 1. Disconnect the Head FFC from the connector of the CR Encoder Board, and pull out the Head FFC from the notch of Carriage. Remove the screws (x2, ) that secure the CR Encoder Board, and remove the CR Encoder Board Connector Notch 2. Match the guide pins of the Carriage (x2, hole (x2) of the CR Encoder Board. ) with the positioning Head FFC C.P.B. (P1)1.7x5, F/ZB (0.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Part/Unit that should be removed before removing Paper Guide Upper Unit 4.4.20 Paper Guide Upper Unit Document Cover / Paper Support Assy. / Scanner Unit / Panel Unit / Housing Upper / Printer Mechanism / Main Board Unit / CR Guide Frame / CR Motor / Carriage Unit External view Paper Guide Upper Unit Removal procedure 1. 2. Set a transparency sheet.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Part/Unit that should be removed before removing Front Frame 4.4.21 EJ Frame Unit Document Cover / Paper Support Assy. / Scanner Unit / Panel Unit / Housing Upper / Print Head / Printer Mechanism / Main Board Unit / CR Guide Frame / CR Motor / Carriage Unit External view EJ Frame Unit Removal procedure C A U T IO N 1. Remove the screws (x3, ) that secure the EJ Frame Unit, and remove the EJ Frame from the Printer Mechanism.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Part/Unit that should be removed before removing Ink System Unit Document Cover / Paper Support Assy. / Scanner Unit / Panel Unit / Housing Upper / Print Head / Printer Mechanism / Main Board Unit / ASF Unit / Holder Shaft Unit / CR Guide Frame / CR Motor / Carriage Unit / EJ Frame Unit Removal procedure 4.4.22 Ink System Unit External view Right Side Guide Pins C A U T IO N Head Cleaner Sealing Rubber Cap Unit 1. 2. 3. C.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Part/Unit that should be removed before removing Paper Guide Front Unit 4.4.23 Paper Guide Front Unit Document Cover / Paper Support Assy.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Part/Unit that should be removed before removing PF Roller Unit 4.4.24 PF Roller Unit Document Cover / Paper Support Assy.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Part/Unit that should be removed before removing Scanner Housing, Upper Document Cover / Scanner Unit 4.5 Scanner Section Removal Procedure 4.5.1 Scanner Housing, Upper C A U T IO N External view Scanner Housing, Upper Document Glass 1. 2. 3. Hinge R C.B.P. 3x10 F/Ni (7±1kgfcm) Remove the screw (x1, ) that secures the hinge R, and remove the hinge R from the Scanner Unit.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Part/Unit that should be removed before removing Scanner Carriage Unit 4.5.2 Scanner Carriage Unit Document Cover / Scanner Unit / Scanner Housing, Upper External view (1) Removal procedure Scanner Carriage Unit C A U T IO N Do not scratch the Rod Lens Array when removing the Scanner Carriage Unit. Rod Lens Array Compound Gears 22.8, 7.762 Figure 4-43. Handling Scanner Carriage Unit 2 3 1 Scanner Timing Belt 1. 2.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 External view (2) Revision A 4. CIS Unit Shaft 5. 6. 7. Open and slide the CIS Unit toward right, and remove the CIS Unit from the Scanner CR Holder. Remove the CIS Spring (x2) from the Scanner CR Holder. Release the tabs (x2, ) that secure the Belt Clump with a tweezer. Remove the Scanner Timing Belt from the Scanner Carriage Unit.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Part/Unit that should be removed before removing Scanner Motor Unit/ Scanner HP Sensor/Driven Holder 4.5.3 Scanner Motor Unit/Scanner HP Sensor/ Driven Pulley Document Cover / Scanner Unit / Scanner Housing, Upper External view Removal procedure Compound Gears 22.8, 7.762 2 1. 2. 3 3. 1 4. Scanner Timing Belt Driven Holder 5. Scanner Motor Connector Cable Hinge L Notch 6. Scanner HP Sensor 7.
CHAPTER 5 ADJUSTMENT
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 5.1 Overview In this printer, it is necessary to perform appropriate adjustment in order to maintain consistent printing function and quality, eliminate differences of each printer mechanism’s characteristics.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 5-1.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 C A U T IO N Revision A When the Main board is replaced with new one, you may have to replace waste drain ink pad also in case the EEPROM parameter back up function is not available on the defective main board. After completing the adjustment, check the printing result with A4 check pattern by using the Adjustment program. If the result is not good, perform appropriate adjustment.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 5.2 Adjustment by Using Adjustment Program The procedures of the adjustment items will be explained here. The intended item is as follows. Revision A 5.2.1 EEPROM Data Copy Adjustment procedure 1. Select “EEPROM Data Copy” in the Adjustment Program. EEPROM Data Copy 2. Click the [backup] button to backup the old main board data. Market Setting 3. When the backup operation is succeeded, 1) Replace the Main Board Unit with a new one.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 5.2.5 Ink Charge 5.2.8 First Dot Adjustment Adjustment procedure Adjustment procedure 1. Select “Ink charge” in the Adjustment Program. 1. Set Photo Paper A4/Letter on the Paper Support. 2. Click the [Ink charge] button to perform the initial ink charge 2. Select “First dot position adjustment” in the Adjustment Program. 3. Click the [Print] button to print the First dot position adjustment pattern. 4.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 5.2.9 Head Angular Adjustment Revision A Adjustment procedure Band pattern OK pattern 1. Set Normal Paper A4/Letter on the Paper Support. 2. Select “Head angular adjustment” in the Adjustment Program. 3. Click the [Print] button to print following two head angular check patterns. • Band pattern • Raster offset pattern 4. Check the printed patterns and select a pattern number that has the least amount of misalignment. 5.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 5.2.10 Bi-D Adjustment 5.2.11 CR Offset Adjustment procedure Adjustment procedure 1. Set Normal Paper A4/Letter on the Paper Support. 1. Select “CR offset” in the Adjustment Program. 2. Select “Bi-D adjustment” in the Adjustment Program. 2. 3. Click the [Print] button to print the Bi-D adjustment pattern. Check each box of the replaced parts/units checklist and then click the [Perform] button. 4.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 5.3 Adjustment Except Adjustment Program Revision A 6. Following is adjustment except Adjustment Program. Set the thickness gauge at the position shown by the figure. The thickness gauge should be placed between the front of the Paper Guide Front Unit and the center ribs. 5.3.1 PG Adjustment Parts to be removed and replaced Removal and Replacement of Carriage Unit Removal and Replacement of Print Head Adjustment procedure 1.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 9. Accede to following steps until you’ve completed the left side PG adjustment. Revision A 11. Loosen the screw (C.B.S 3x6) for securing the Parallel Adjustment Lever (Right). START Parallel Adjustment Lever (Right) Step 8 Move the Carriage Unit by using the Timing Belt. C.B.S 3x6 Note : “Down” means PG (Platen Gap) wide. Thickness Gauge moves? Yes One notch down the Parallel Adjustment Lever (Left). Figure 5-9.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 13. Move the Carriage Unit on the thickness gauge by using the Timing Belt, and check whether the thickness gauge moves or not. C A U T IO N If you push the Carriage Unit directly, it's possible to damage the Print Head surface by the friction with the thickness gauge. Following is the relationship between “Parallel Adjustment Lever (Right) operation” and “Platen gap reaction”. PG up (narrower) Revision A 14.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 5.3.2 PF Scale Sensor Positioning Adjustment 17. Accede to following steps to check left side PG again. Parts to be removed and replaced START Replacement of Main Board Unit Replacement of PF Roller Unit Adjustment procedure Move the Carriage Unit by using the Timing Belt. Thickness Gauge moves? Yes Re-adjust from the beginning. 1.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 5.3.3 Original Adjustment Revision A 3. Parts to be removed and replaced Replacement of Scanner Housing, Upper Replacement of Scanner Unit C A U T IO N Open the document cover, and place the original adjustment jig as shown in the figure below. Place the jig against the upper left corner of the Scanner Housing, Upper This adjustment requires the FT (Function Test) program and the exclusive adjustment jig.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 5. Click the “Single Test” icon on the “EPSON Scanner Function Test C592B00W” window. Revision A 7. A progress bar will be displayed followed by the window described below. Single Test Icon Figure 5-18. Original Adjustment (3) 6. Enter the product number on the “Single Test” window, select “Write Zero Correction Value”, and press the [Execute] button. Figure 5-20.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A . Figure 5-22. Window displayed when the adjustment is failed If the adjustment could not be completed successfully, check whether the parts are correctly installed or not. If this does not work, perform the part replacement once again.
CHAPTER 6 MAINTENANCE
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Document glass Remove dust or any paper with a clean dry cloth. In case dirt is serious or alien substance is stick, wipe it off with a cloth moistened with neutral detergent. In case Stain 6.1 Overview This section provides information to maintain the printer in its optimum condition. 6.1.1 Cleaning 6.1.2 Service Maintenance This printer has no mechanical components which require regular cleaning except the Print Head.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 1. Revision A Select the “EPSON Status Monitor 3” in the printer driver utility, and make sure that the printer is in stand-by state by using the Status monitor 3. If the printer is in stand-by state, the following figure is indicated on the monitor. Maintenance request error (Maintenance call error) Ink is used for the Print Head cleaning operation as well as the printing operation.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Refer to the following figures for the lubrication points. 6.1.3 Lubrication The characteristics of the grease have great affects on the mechanical function and durability, especially does the characteristics about temperature environment. The type and amount of the grease used to lubricate the printer parts are determined based on the results of the internal evaluations.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Lubrication Prohibited Area 2 Paper Back Lever Hopper 1 Revision A 1. Paper Back Lever Surface 2. Hopper Surface Cartridge Cover Surface G-74 1. G-26 2. G-26 0.02g x 1 point φ1 x 1mm Use a flux dispenser to apply. • Grease must not be adhered to other parts. 1. Use a injector to apply. 2.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A EJ Frame Unit Surface KEN Grease Paper Guide Front Unit G-74 200mg EJ Frame Unit Contact position between the EJ Roller and the Paper Guide Front Unit EJ Roller φ1 x 0.04gr x 12 points Use a injector to apply. Use a flux dispenser to apply. Figure 6-10. Lubrication on EJ Frame Unit Figure 6-12.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Contact point between Bush 10 (Right) and PF Roller Unit Bush 10 (Right) G-26 φ1 x φ of the PF Roller Unit PF Roller Unit Spool Gear 13.5 Use a injector to apply. • Do not adhere G-26 to Spool Gear 13.5. Figure 6-14.
CHAPTER 7 APPENDIX
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 7.1 Connector Summary See the following tables for the connector summary for the C612 Main board and each connector’s pin alignment. 7.1.1 Major Component Unit Table 7-1. Connector Summary for C612 Main Board Connector The major component units of this printer are as follows. Function Table to refer to Main Board (C612 Main) CN1 For connection with the Power Supply Board Table 7-2 (p.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 7-3. CN3 - PE Sensor Pin Signal Name I/O 1 PE I 2 GND 3 PEV Table 7-5.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A Table 7-10. CN11 - Scanner Carriage Table 7-7. CN8 - CR Motor Pin Signal Name I/O Function 1 CR-A O CR Motor drive signal (A) 2 CR-B O CR Motor drive signal (B) Table 7-8. CN9 - PF Motor Pin Signal Name I/O Function 1 PF-A O PF Motor drive signal (A) 2 PF-B O PF Motor drive signal (B) Table 7-9.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 7.2 Exploded Diagram Following pages show exploded diagram.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 102 400 100 115 104 103 110 106 101 114 105 107 109 111 112 109 108 113 109 109 EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Rev.01 C612-CASE-001 Figure 7-2.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 200 300 EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Rev.01 C612-ELEC-001 Figure 7-3.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 811 813 801 810 800 811 812 812 802 815 809 806 807 814 816 805 803 EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 804 Rev.01 C612-MECH-001 Figure 7-4.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 501 511 510 500 520 503 509 521 506 512 513 504 505 508 507 522 517 523 600 516 518 515 EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Rev.01 C612-MECH-002 Figure 7-5.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 540 530 541 546 531 546 533 547 545 534 548 532 542 544 543 535 536 536 549 536 537 538 EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Rev.01 C612-MECH-003 Figure 7-6.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 7.3 Parts List Code Parts list for EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Code Parts Name Parts Name 806 HINGE,L 816 MAT,COVER,DOCUMENT 200 MAIN BOARD ASSY. 100 PAPER SUPPORT ASSY. 300 POWER SUPPLY UNIT;100V 101 HOUSING,UPPER;EDG2 501 ASF UNIT 102 HOUSING,PANEL;EDG2;TEXT;LETTER 500 PRINTER MECHANISM(ASP)MAP10-100 103 BUTTON,PANEL;ENB7 503 HOLDER,SHAFT ASSY.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Code Revision A Parts Name Code Parts Name 531 PAPER GUIDE,FRONT ASSY. 813 FFC,CIS 532 MOTOR ASSY.,CR 814 CLAMP,BELT 533 SCALE,PF;B 815 CR,CIS 534 DOUBLE SIDED TAPE,D21 NON FIG INK CART.UNBOXED,BK-S,PIG'T;G38C,WST,AS 535 SPUR GEAR,36 NON FIG INK CART.UNBOXED,C-S,PIG'T;G38C,WST,AS 536 PAPER GUIDE,UPPER ASSY. NON FIG INK CART.UNBOXED,M-S,PIG'T;G38C,WST,AS 537 ROLLER,PF ASSY. NON FIG INK CART.
EPSON Stylus CX3700/CX3800/CX3805/CX3810/DX3800/DX3850 Revision A 7.
Model : Stylus CX3700/CX3800/CX3805/ CX3810/DX3800/DX3850 Board : C612 MAIN Rev.
Model : Stylus CX3700/CX3800/CX3805/ CX3810/DX3800/DX3850 Board : C610 PSB Rev.
Model : Stylus CX3700/CX3800/CX3805/ CX3810/DX3800/DX3850 Board : C610 PSE Rev.
Model : Stylus CX3700/CX3800/CX3805/ CX3810/DX3800/DX3850 Board : C612 PNL Rev.
