Brother ADS-2000 Service Manual page 23

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 ................................................................................................................... 2-3
2.1 Cross-section Drawing .......................................................................................... 2-3
2.2 Paper Feeding ....................................................................................................... 2-4
2.3 Operation of Each Part .......................................................................................... 2-5
2.4 Block Diagram ....................................................................................................... 2-6
2.5 Main Components ................................................................................................. 2-7
3. ERROR INDICATIONS.................................................................................................. 2-8
3.1 LED Display when an Error Occurs....................................................................... 2-8
3.2 Status Error Messages ........................................................................................ 2-13
4. TROUBLESHOOTING ................................................................................................ 2-14
4.1 Troubleshooting for Error Display ........................................................................ 2-14
4.1.1 The double feeding sensor detected multiple documents. ....................... 2-14
4.1.2 The document scanning position sensor detected
that the document length was 40 cm or more. (Document jam)............... 2-14
4.1.3 The document scanning position sensor has not detected
the top of the document even after the document
has been fed for the specified distance. (Document jam) ........................ 2-14
4.1.4 A non-supported USB device is connected to the USB terminal.
A USB device with a built-in hub is connected to the USB terminal.
A USB device not within the specifications is connected
to the USB terminal, resulting in overcurrent............................................ 2-15
4.1.5 The scanned data has exceeded the built-in memory capacity................ 2-15
4.1.6 The first side or second side CIS flat cable is not connected correctly. ... 2-15
4.1.7 An error occurred during access to the DRAM in the main PCB ASSY.
Program error
An error occurred in the ROM checksum.
Write error in the EEPROM of the main PCB........................................... 2-15
4.1.8 The country code was not entered correctly............................................. 2-15
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