Brother DCP-L2551DW User Manual

Confidential
Read this manual thoroughly before maintenance work.
Keep this manual in a convenient place for quick and easy reference at all times.
August 2017
SM-FAX186
8C5K*
Ver.4
Brother Laser MFC
SERVICE MANUAL
DCP-7090/7095D/7190DN/7195DW
DCP-B7500D/B7520DW/B7530DN/B7535DW
DCP-L2510D/L2511D/L2512D/L2530DW
DCP-L2531DW/L2532DW/L2535D/L2535DW
DCP-L2536D/L2537DW/L2550DN/L2550DW
DCP-L2551DN/L2551DW/L2552DN
HL-L2390DW/L2395DW
MFC-7390/7490D/7890DN/7895DW
MFC-B7700D/B7715DW/B7720DN
MFC-L2690DW/L2710DN/L2710DW/L2712DN
MFC-L2712DW/L2713DW/L2715D/L2715DW
MFC-L2716D/L2716DW/L2717DW
MFC-L2730DW/L2732DW/L2750DW/L2750DWXL
MFC-L2751DW/L2752DW/L2770DW/L2771DW
MODEL

Brother DCP-L2551DW Specifications

General

Print Technology	Laser
Functions	Print, Copy, Scan
Paper Capacity	250 sheets
ADF Capacity	50 sheets
Max Paper Size	A4
Connectivity	USB, Ethernet, Wi-Fi
Copy Resolution	Up to 600 x 600 dpi
Processor	600 MHz
Operating System Support	Windows, Mac OS, Linux
Print Resolution	Up to 2400 x 600 dpi
Duplex Printing	Automatic
Mobile Printing	Brother iPrint&Scan, AirPrint, Google Cloud Print
Scanner Type	Flatbed, ADF
Scan Resolution	1200 x 1200 dpi
Toner Yield	Approx. 1, 200 pages
Copy Speed (Black)	Up to 34 cpm (copies per minute)

Summary

SAFETY INFORMATION

CHAPTER 2 ERROR INDICATIONS AND TROUBLESHOOTING

1.1 Precautions

1.2 Checks before Commencing Troubleshooting

Outlines pre-repair checks for operating environment, power, paper, and consumables.

3. ERROR INDICATIONS

Lists error codes, their descriptions, and reference pages for troubleshooting.

3.1 Error Codes

Details specific error codes, their causes, and troubleshooting references.

3.2 Error Message

Lists error messages displayed on the LCD and their corresponding descriptions.

3.2.1 LCD models

Provides error messages for LCD models, their causes, and error codes.

3.2.2 Touch panel models

Lists error messages for touch panel models, their causes, and error codes.

3.3 Communication Errors

4. TROUBLESHOOTING

Provides guidance on diagnosing and resolving machine malfunctions.

4.1 Error Cause and Remedy

Lists specific error codes with their causes and recommended remedies.

4.2 Troubleshooting for Paper Feeding Problems

Addresses common issues related to paper feeding and their solutions.

4.2.1 No paper feeding from paper tray

Outlines user checks and steps to resolve paper feeding issues from the paper tray.

4.2.3 No paper feeding from manual feed slot

Provides troubleshooting steps for when no paper is fed from the manual feed slot.

4.2.4 Multiple sheets of paper are fed

4.2.5 Paper becomes wrinkled

4.2.6 Paper is fed at an angle

4.2.7 Paper curls

4.2.8 Unable to perform 2-sided printing

Addresses issues preventing 2-sided printing and provides troubleshooting steps.

4.2.9 Paper jam

Details troubleshooting for paper jams in various locations within the machine.

4.3 Troubleshooting for Image Defects

Guides users through identifying and resolving various scanning image defects.

4.3.1 Image defect examples

4.3.2 Troubleshooting image defect

Provides step-by-step solutions for specific image defects.

4.4 Troubleshooting for Software Problems

Offers solutions for software-related printing issues.

4.4.1 Unable to receive data

Guides users on how to resolve issues with receiving data for printing.

4.5 Troubleshooting for Network Problems

Provides solutions for network connectivity and printing issues.

4.5.1 Cannot make a print through network connection

Offers steps to troubleshoot printing problems over a network connection.

4.6 Troubleshooting for Control Panel Problems

Addresses issues related to the machine's control panel and display.

4.6.1 Nothing is displayed on the LCD

4.7 Troubleshooting for Toner Cartridge and Drum Unit Problems

Guides users on resolving issues related to toner cartridges and drum units.

4.7.1 New toner not detected

Offers solutions when the machine does not detect a new toner cartridge.

4.8 Troubleshooting for Fuser Unit Problems

Provides troubleshooting steps for fuser unit failures.

4.9 Troubleshooting for Laser Unit Problems

Addresses issues related to laser unit failures and their solutions.

4.10 Troubleshooting for PCB Problems

Offers solutions for problems related to the machine's Printed Circuit Boards.

4.10.1Main PCB failure

Provides troubleshooting steps for a malfunctioning Main PCB.

4.11 Troubleshooting for Document Feeding Problems

Guides users on resolving issues with document feeding in the ADF.

4.11.1No document is fed

4.11.3Document jam

Details troubleshooting for document jams occurring in the ADF.

4.11.4Document becomes wrinkled

4.11.5Document size is not detected correctly

4.12 Troubleshooting for Scanning Image Defect

Guides users in identifying and resolving various scanning image defects.

4.12.1Defect examples

4.13 Troubleshooting for FAX/Phone Problems

Provides solutions for common fax and phone communication issues.

4.13.1Fax cannot be sent

4.14 Troubleshooting for Other Problems

Addresses miscellaneous problems not covered in other troubleshooting sections.

4.14.1Cannot make print

CHAPTER 3 DISASSEMBLY/REASSEMBLY

1. SAFETY PRECAUTIONS

Lists essential safety warnings and precautions for disassembly and reassembly.

8. DISASSEMBLY FLOW CHART

9. DISASSEMBLY PROCEDURE

Provides detailed step-by-step instructions for disassembling machine parts.

CHAPTER 4 ADJUSTING AND UPDATING SETTINGS AS REQUIRED AFTER PARTS REPLACEMENT

1. IF YOU REPLACE THE MAIN PCB ASSY

Guides on post-replacement procedures for the Main PCB, including firmware and settings.

2. IF YOU REPLACE THE LOW-VOLTAGE POWER SUPPLY PCB ASSY

3. IF YOU REPLACE THE LASER UNIT

4. IF YOU REPLACE THE PANEL UNIT OR PANEL CONTROL PCB

5. IF YOU REPLACE THE ADF UNIT, FIRST SIDE CIS UNIT, SECOND SIDE CIS UNIT OR DOCUMENT SCANNER UNIT

CHAPTER 5 SERVICE FUNCTIONS

1. FUNCTION CODE

Introduces the maintenance mode and function codes for service operations.

1.1 How to Enter Maintenance Mode

Explains how to access the maintenance mode for service personnel.

1.1.1 Method of entering maintenance mode for service personnel

1.2 List of Maintenance Mode Functions

1.3 Details of Maintenance Mode Functions

Provides detailed explanations and operating procedures for maintenance functions.

1.3.1 Initialize EEPROM parameters (Function code 01, 91)

1.3.2 Transition to shipping state (Function code 03)

1.3.3 ADF performance test (Function code 08)

1.3.4 Print quality test pattern (Function code 09)

1.3.5 Set worker switches (WSW) and print worker switch setting data (Function code 10, 11)

1.3.6 Check LCD operation (Function code 12)

1.3.7 Check control panel key operation (Function code 13)

1.3.9 Check sensor operation (Function code 32)

1.3.11 Set PC print functions (Function code 43)

1.3.12 Change USB No. return value / Adjust left-end print position / Adjust upper-end print position / Change ON/OFF setting for lower case compensation / Change ON/OFF setting for fixation strength improvement (Function code 45)

1.3.13 Adjust printable range for each speed level (Function code 46)

1.3.14 Transfer received fax data / log information (fax models only) (Function code 53)

1.3.15 Fine-tune scanning position (Function code 54)

1.3.16 Acquire white level data and set CIS scan area (Function code 55)

1.3.17 Check toner cartridge (Models with cartridge sensor only) (Function code 57)

1.3.18 Adjust touch panel (Function code 61)

1.3.19 Continuous print test (Function code 67)

1.3.23 Configure for country/region and model (Function code 74)

1.3.24 Print maintenance information (Function code 77)

1.3.27 Display machine log information (Function code 80)

1.3.28 Display machine error code (Function code 82)

1.3.30 Reset irregular power supply detection counter of low-voltage power supply PCB (Function code 88)

2. OTHER SERVICE FUNCTIONS

CHAPTER 6 WIRING DIAGRAM

1. WIRING DIAGRAM

APPENDIX 2 DELETING USER SETTING INFORMATION

APPENDIX 3 INSTALLING THE MAINTENANCE PRINTER DRIVER

Windows 7/Windows 8/Windows 8.1/Windows 10