Ricoh B286 Service Manual page 23

Text/Photo Mode ................................................................................ 6-19
Photo Mode ........................................................................................ 6-19
Background Lines Mode..................................................................... 6-20
Patched Original Mode....................................................................... 6-21
Generation Mode................................................................................ 6-22
6.4 AROUND THE DRUM.............................................................................. 6-23
6.4.1 OVERVIEW..................................................................................... 6-23
6.4.2 DRUM DRIVE ................................................................................. 6-24
6.4.3 CHARGE CORONA UNIT............................................................... 6-25
6.4.4 CORONA WIRE CLEANING........................................................... 6-26
6.4.5 DRUM CLEANING .......................................................................... 6-27
6.4.6 COLLECTING USED TONER......................................................... 6-28
6.4.7 QUENCHING .................................................................................. 6-29
6.4.8 DRUM ANTI-CONDENSATION HEATERS .................................... 6-30
6.5 IMAGE WRITING ..................................................................................... 6-31
6.6 DEVELOPMENT ...................................................................................... 6-32
6.6.1 OVERVIEW..................................................................................... 6-32
6.6.2 DEVELOPMENT DRIVE MECHANISM .......................................... 6-33
6.6.3 TONER SUPPLY MECHANISM ..................................................... 6-34
6.6.4 DEVELOPER CROSS-MIXING ...................................................... 6-35
6.6.5 DEVELOPMENT BIAS.................................................................... 6-36
6.6.6 ID SENSOR .................................................................................... 6-37
6.6.7 WARMUP CONTROL (VSG CORRECTION) ................................. 6-38
6.6.8 TONER DENSITY CONTROL ........................................................ 6-39
Overview ............................................................................................ 6-39
Supply Modes..................................................................................... 6-39
Detect Supply Mode ........................................................................... 6-40
Fixed Supply Mode............................................................................. 6-41
Toner Supply Clutch Operation .......................................................... 6-41
6.6.9 TONER END/NEAR-END DETECTION.......................................... 6-43
Toner Near End.................................................................................. 6-43
Toner End........................................................................................... 6-43
Toner End Recovery .......................................................................... 6-43
6.7 PAPER FEED AND REGISTRATION ...................................................... 6-45
6.7.1 OVERVIEW..................................................................................... 6-45
Layout Diagrams ................................................................................ 6-45
SM xi B286/B289