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Brother HL-5440D Service Manual Page 35

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CHAPTER 2 TROUBLESHOOTING
This chapter details error messages and codes which the incorporated self-diagnostic
function of the machine will display if any error or malfunction occurs. If any error message
appears, refer to this chapter to find which parts should be checked or replaced.
The latter half of this chapter provides sample problems which could occur in the main
sections of the machine and related troubleshooting procedures. These will help service
personnel identify and repair other similar defective sections.
1. INTRODUCTION ........................................................................................................... 2-1
1.1 Precautions............................................................................................................ 2-1
1.2 Checks before Commencing Troubleshooting....................................................... 2-2
2. OVERVIEW ................................................................................................................... 2-4
2.1 Cross-section Drawing .......................................................................................... 2-4
2.2 Paper Feeding ....................................................................................................... 2-5
2.3 Operation of Each Part .......................................................................................... 2-6
2.4 Block Diagram ....................................................................................................... 2-8
2.5 Main Components ................................................................................................. 2-9
3. ERROR INDICATIONS................................................................................................ 2-10
3.1 Error Codes ......................................................................................................... 2-10
3.2 Error Messages ................................................................................................... 2-16
3.3 LED Display (LED Model).................................................................................... 2-19
3.3.1 LED display when operator call occurs .................................................... 2-19
3.3.2 LED display when service call occurs ...................................................... 2-23
4. TROUBLESHOOTING ................................................................................................ 2-28
4.1 Error Cause and Remedy.................................................................................... 2-28
4.2 Troubleshooting for Paper Feeding Problems ..................................................... 2-57
4.2.1 Multiple sheets of paper are fed ............................................................... 2-57
4.2.2 Paper becomes wrinkled .......................................................................... 2-57
4.2.3 Paper is fed at an angle ........................................................................... 2-57
4.2.4 Duplex printing is not possible.................................................................. 2-58
4.2.5 Paper is curled ......................................................................................... 2-58
4.3 Troubleshooting for Image Defects...................................................................... 2-59
4.3.1 Image defect examples ............................................................................ 2-59
4.3.2 Troubleshooting according to image defect ............................................. 2-60
4.4 Troubleshooting for Software Problems .............................................................. 2-73
4.4.1 Cannot print data...................................................................................... 2-73
4.5 Troubleshooting for Network Problems ............................................................... 2-74
4.5.1 Cannot print via network connection ........................................................ 2-74
4.5.2 Cannot connect to access point ............................................................... 2-74
CONTENTS
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