40718401TH Rev.5 3 /4. ADJUSTMENT ........................................................................................................ 764.1 Maintenance Modes and Functions ................................................................ 764.1.1 User Maintenance Mode ........................................................................................ 764.1.2 System Maintenance Mode .................................................................................... 764.1.3 Engine Maintenance Mode ..................................................................................... 774.1.4 EEPROM initialization ............................................................................................ 784.2 Adjustment When Replacing a Part ................................................................ 794.2.1 Setting of LED Head Drive Time ............................................................................ 794.2.2 Uploading/Downloading EEPROM data ................................................................. 825. PERIODICAL MAINTENANCE .............................................................................. 835.1 Periodical Replacement Parts ........................................................................ 835.2 Cleaning.......................................................................................................... 835.2.1 Cleaning of LED Lens Array ................................................................................... 835.2.2 Cleaning Page Function ......................................................................................... 856. TROUBLESHOOTING PROCEDURES ................................................................. 866.1 Troubleshooting Tips ...................................................................................... 866.2 Points to Check before Correcting Image Problems ....................................... 866.3 Tips for Correcting Image Problems ............................................................... 866.4 Preparation for Troubleshooting ..................................................................... 876.5 Troubleshooting Flow ..................................................................................... 886.5.1 LCD Status Message/Problem List ........................................................................ 886.5.2 LCD Message Troubleshooting .............................................................................. 986.5.3 Image Troubleshooting ........................................................................................... 1077. WIRING DIAGRAM ................................................................................................ 1187.1 Interconnect Signal Diagram .......................................................................... 1187.2 PCB Layout and Connector Signal List .......................................................... 1197.3 Resistance Check ........................................................................................... 1287.4 Short Plug Setting ........................................................................................... 1308. PARTS LIST ........................................................................................................... 131APPENDIX A RS-232C SERIAL INTERFACE (OPTION) ......................................... 138APPENDIX B CENTRONICS PARALLEL INTERFACE ............................................ 143APPENDIX C LOOP TEST (RS-232C INTERFACE) ................................................. 149APPENDIX D DIAGNOSTICS TEST .......................................................................... 150APPENDIX E 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 ................................................................................................ 1593. PARTS REPLACEMENT ................................................................................ 1603.1 Precautions Concerning Parts Replacement ......................................................... 1603.2 Parts Layout ........................................................................................................... 162