Ricoh D0C8, Service Manual

Page: 26 / 1647

SM xx D0CA/D0C9/D0C8/D0CB
7.9.6 IMAGE POSITION CORRECTION ................................................................... 7-64
7.10 PROCESS CONTROL AND MUSIC ..................................................................... 7-65
7.10.1 PROCESS CONTROL ...................................................................................... 7-65
Outline ................................................................................................................... 7-65
Charge/Development Bias Control and Vtref Compensation ............................... 7-67
This step agitates the developer, and gets the TD sensor output. ....................... 7-68
Toner Near-End ..................................................................................................... 7-69
ID sensor (S27-S29) .............................................................................................. 7-71
TD Sensor (S14-S17) ............................................................................................ 7-71
7.10.2 MUSIC ............................................................................................................... 7-72
Color Skew Adjustment Timing ............................................................................. 7-72
MUSIC Error Determination .................................................................................. 7-73
Adjustment Overview ............................................................................................ 7-73
7.11 FUSING ........................................................................................................................ 7-74
7.11.1 OVERVIEW ....................................................................................................... 7-74
7.11.2 FUSING MECHANISM ...................................................................................... 7-75
7.11.3 FUSING TEMPERATURE CONTROL .............................................................. 7-76
7.11.4 FUSING DRIVE ................................................................................................. 7-77
7.11.5 FUSING MODE CONTROL .............................................................................. 7-78
7.11.6 CPM DOWN CONTROL ................................................................................... 7-79
7.12 PAPER FEED AND REGISTRATION (IM C300 SERIES) .................................... 7-80
7.12.1 OVERVIEW ....................................................................................................... 7-80
7.12.2 PAPER TRANSPORT MOTOR (M12) .............................................................. 7-81
7.12.3 TRAY LIFT MECHANISM .................................................................................. 7-82
7.12.4 TRANSPORT CONTROL .................................................................................. 7-83
7.12.5 TRAY AUTO-CLOSE MECHANISM .................................................................. 7-83
7.13 PAPER FEED AND REGISTRATION (IM C400 SERIES) .................................... 7-84
7.13.1 OVERVIEW ....................................................................................................... 7-84
7.13.2 PAPER TRANSPORT ....................................................................................... 7-85
7.13.3 PAPER FEED MECHANISM ............................................................................. 7-86
In this machine, to maintain the paper gap constant, the paper feed sensor (S31) [A]
near the paper feed roller adjusts the paper feed timing. ..................................... 7-86
7.13.4 PAPER END DETECTION ................................................................................ 7-88
7.13.5 TRAY LIFT MECHANISM .................................................................................. 7-89
7.13.6 TRAY AUTO-CLOSE MECHANISM .................................................................. 7-90
7.14 PAPER FEED AND REGISTRATION (NEW FUNCTIONS) ................................. 7-91
7.15 BYPASS TRAY ...................................................................................................... 7-93
7.15.1 BYPASS TRAY BOTTOM PLATE LIFT MECHANISM ...................................... 7-93
7.15.2 PAPER SIZE DETECTION AND PAPER END DETECTION ........................... 7-94