DETAILED DESCRIPTIONS 1. OVERVIEW ... 1 1.1 COMPONENT LAYOUT ... 1 1.1.1 D160 D161 D170 CIS SCANNER COMPONENT LAYOUT ... 3 1.1.2 D158 D159 CCD SCANNER COMPONENT LAYOUT ... 3 1.2 PAPER PATH ... 4 1.3 DRIVE LAYOUT... 5 2. BOARD STRUCTURE ... 7 2.1 BLOCK DIAGRAM ... 7 BICU (Base Engine and Image Control Unit) ... 8 2.2 SBU (SENSOR BOARD UNIT) ... 8 3. COPY PROCESS OVERVIEW ... 9 4. SCANNING D158 D159 11 4.1 OVERVIEW ... 11 4.2 SCANNER DRIVE ... 12 4.3 ORIGINAL SIZE DETECTION IN PLATEN MODE ... 13 4.4 ANTI-CONDENSATION HEATER ... 14 5. SCANNING D160 D161 D170 15 5.1 OVERVIEW ... 15 5.2 SCANNER DRIVE ... 16 6. LASER EXPOSURE ... 18 6.1 OVERVIEW ... 18 6.2 AUTO POWER CONTROL (APC) ... 19 6.3 LD SAFETY SWITCH ... 20 7. PHOTOCONDUCTOR UNIT (PCU) ... 21 7.1 OVERVIEW ... 21 7.2 DRIVE ... 23 8. DRUM CHARGE ... 24 8.1 OVERVIEW ... 24 8.2 ID SENSOR PATTERN PRODUCTION TIMING ... 25 8.3 DRUM CHARGE ROLLER CLEANING ... 26 9. DEVELOPMENT ... 27 9.1 OVERVIEW ... 27 9.2 DRIVE ... 289.3 DEVELOPER MIXING ... 29 9.4 DEVELOPMENT BIAS ... 30 9.5 TONER SUPPLY ... 31 9.5.1 TONER BOTTLE REPLENISHMENT MECHANISM ... 31 9.6 TONER SUPPLY MECHANISM ... 32 9.7 TONER DENSITY CONTROL ... 33 9.7.1 OVERVIEW ... 33 9.7.2 TONER DENSITY SENSOR INITIAL SETTING ... 35 9.7.3 TONER CONCENTRATION MEASUREMENT ... 35 9.7.4 VSP/VSG DETECTION... 35 9.7.5 TONER SUPPLY REFERENCE VOLTAGE (VREF) DETERMINATION 36 9.7.6 TONER SUPPLY DETERMINATION ... 36 9.7.7 TONER SUPPLY MOTOR ON TIME DETERMINATIONS ... 36 9.8 TONER SUPPLY IN ABNORMAL SENSOR CONDITIONS... 38 9.8.1 ID SENSOR ... 38 9.8.2 TD SENSOR ... 38 9.9 TONER NEAR END/END DETECTION AND RECOVERY... 38 9.9.1 TONER NEAR END DETECTION ... 38 9.9.2 TONER NEAR END RECOVERY ... 39 9.9.3 TONER END DETECTION ... 39 9.9.4 TONER END RECOVERY... 39 10.DRUM CLEANING AND TONER RECYCLING... 40 10.1 DRUM CLEANING... 40 10.2 TONER RECYCLING ... 41 11.PAPER FEED ... 42 11.1 OVERVIEW ... 42 11.2 PAPER FEED DRIVE MECHANISM ... 43 11.3 PAPER FEED AND SEPARATION MECHANISM ... 44 11.4 PAPER LIFT MECHANISM ... 45 11.5 BY-PASS TRAY BOTTOM PLATE LIFT MECHANISM ... 46 11.6 PAPER END DETECTION ... 47 11.7 PAPER SIZE DETECTION ... 48 11.7.1 PAPER TRAY ... 48 0: PUSHED, 1: NOT PUSHED ... 48 11.7.2 BY-PASS TRAY ... 50 11.8 SIDE FENCES ... 51 11.9 PAPER REGISTRATION ... 52 12.IMAGE TRANSFER AND PAPER SEPARATION ... 53 12.1 OVERVIEW ... 53 12.2 IMAGE TRANSFER CURRENT TIMING ... 54 12.3 TRANSFER ROLLER CLEANING ... 55 12.4 PAPER SEPARATION MECHANISM... 56 13.IMAGE FUSING AND PAPER EXIT ... 57 13.1 OVERVIEW ... 57 13.2 FUSING UNIT DRIVE AND RELEASE MECHANISM ... 58 13.2.1 FUSING UNIT DRIVE ... 58 13.2.2 DRIVE RELEASE MECHANISM ... 58 13.2.3 CONTACT/RELEASE CONTROL ... 59 13.2.4 DRIVE RELEASE SOLENOID ... 59 13.3 FUSING ENTRANCE GUIDE SHIFT ... 60 13.4 PRESSURE ROLLER ... 60 13.5 FUSING TEMPERATURE CONTROL... 61 13.5.1 OVERVIEW ... 61 13.5.2 TEMPERATURE CONTROL ... 62 13.6 OVERHEAT PROTECTION ... 64 14.DUPLEX UNIT ... 65 14.1 OVERALL... 65 14.2 DRIVE MECHANISM ... 66 14.3 BASIC OPERATION ... 67 14.4 FEED IN AND EXIT MECHANISM ... 69 15.ENERGY SAVER MODES OF BASIC MACHINES ... 70 15.1 OVERVIEW ... 70 15.2 AOF ... 71 15.3 TIMERS ... 71 15.4 RECOVERY ... 71 16.ENERGY SAVER MODES OF GDI MACHINES ... 72 16.1 OVERVIEW ... 72 16.2 AOF ... 73 16.3 TIMERS ... 73 16.4 RECOVERY ... 73 17.OVERVIEW ... 74 18.BOARDS ... 75 18.1 FCU ... 75 19.SERVICE RAM ADDRESSES ... 77 20.VIDEO DATA PATH ... 91 20.1 TRANSMISSION ... 91 20.1.1 MEMORY TRANSMISSION AND PARALLEL MEMORY TRANSMISSION ... 91 20.1.2 IMMEDIATE TRANSMISSION ... 92 20.1.3 JBIG TRANSMISSION ... 92 20.1.4 ADJUSTMENTS ... 92 20.2 RECEPTION ... 93 21.FAX COMMUNICATION FEATURES ... 94 21.1 DOCUMENT SERVER ... 94 21.2 INTERNET MAIL COMMUNICATION ... 95 21.2.1 MAIL TRANSMISSION ... 95 21.2.2 21.2.3 21.2.4 21.2.5 21.2.6 MAIL RECEPTION ... 98 HANDLING MAIL RECEPTION ERRORS ... 100 SECURE INTERNET RECEPTION ... 101 TRANSFER REQUEST: REQUEST BY MAIL ... 101 E-MAIL OPTIONS (SUB TX MODE) ... 102 22.IP-FAX ... 106 22.1 WHAT IS IP-FAX? ... 106 22.2 T.38 PACKET FORMAT ... 106 22.2.1 UDP RELATED SWITCHES... 106 22.3 SETTINGS ... 106