41356801TH Rev.1 5 /4. ADJUSTMENT ........................................................................................................ 734.1 Maintenance Modes and Functions ................................................................ 734.1.1 User Maintenance Mode .......................................................................................... 734.1.2 System Maintenance Mode ...................................................................................... 734.1.3 Engine Maintenance Mode ....................................................................................... 744.1.4 EEPROM initialization .............................................................................................. 754.2 Adjustment When Replacing a Part ................................................................ 764.2.1 Uploading/Downloading EEPROM data ................................................................... 765. PERIODICAL MAINTENANCE .............................................................................. 775.1 Periodical Replacement Parts ........................................................................ 775.2 Cleaning.......................................................................................................... 775.2.1 Cleaning of LED Lens Array ..................................................................................... 775.2.2 Cleaning Page Function ........................................................................................... 796. TROUBLESHOOTING PROCEDURES ................................................................. 806.1 Troubleshooting Tips ...................................................................................... 806.2 Points to Check before Correcting Image Problems....................................... 806.3 Tips for Correcting Image Problems ............................................................... 806.4 Preparation for Troubleshooting ..................................................................... 816.5 Troubleshooting Flow ..................................................................................... 826.5.1 LCD Status Message/Problem List........................................................................... 826.5.2 LCD Message Troubleshooting ................................................................................ 936.5.3 Image Troubleshooting ............................................................................................. 1027. WIRING DIAGRAM ................................................................................................ 1137.1 Interconnect Signal Diagram .......................................................................... 1137.2 PCB Layout and Connector Signal List .......................................................... 1147.3 Resistance Check ........................................................................................... 1248. PARTS LIST ........................................................................................................... 126APPENDIX A RS-232C SERIAL INTERFACE (OPTION) ........................................... 133APPENDIX B CENTRONICS PARALLEL INTERFACE .............................................. 138APPENDIX C UNIVERSAL SERIAL BUS (USB) ......................................................... 144APPENDIX D LOOP TEST (RS-232C INTERFACE) ................................................... 148APPENDIX E DIAGNOSTICS TEST ............................................................................ 149APPENDIX F MULTI PURPOSE FEEDER MAINTENANCE ...................................... 1581. OUTLINE ........................................................................................................ 1581.1 Functions .................................................................................................................. 1581.2 External View and Component Names..................................................................... 1582. MECHANISM DESCRIPTION ........................................................................ 1592.1 General Mechanism ................................................................................................. 1592.2 Hopper Mechanism .................................................................................................. 159