Ricoh B286 Service Manual page 24

Feed Station Overview ....................................................................... 6-47
Manual Feed Table ............................................................................ 6-48
Roll Feeder......................................................................................... 6-48
Paper Cassette................................................................................... 6-48
Paper Width and Type Settings.......................................................... 6-48
6.7.2 MANUAL FEED MECHANISM........................................................ 6-49
6.7.3 ROLL FEED MECHANISM ............................................................. 6-50
Drive................................................................................................... 6-50
Roll Pre-feeding.................................................................................. 6-51
Roll Paper Feed ................................................................................. 6-53
6.7.4 ROLL FEEDER PAPER HOLDERS................................................ 6-54
6.7.5 ROLL PAPER CUTTING MECHANISM.......................................... 6-55
6.7.6 ROLL END DETECTION ................................................................ 6-56
6.7.7 PAPER CASSETTE MECHANISM ................................................. 6-58
6.7.8 PAPER CASSETTE FEED ............................................................. 6-59
Cassette Paper Path .......................................................................... 6-59
Paper Cassette Pre-Feeding .............................................................. 6-60
6.7.9 PAPER CASSETTE PAPER END DETECTION............................. 6-61
6.7.10 CONDENSATION PREVENTION ............................................. 6-62
6.7.11 PAPER REGISTRATION .......................................................... 6-63
6.8 IMAGE TRANSFER AND SEPARATION................................................. 6-64
6.8.1 OVERVIEW..................................................................................... 6-64
Transfer Corona Unit.......................................................................... 6-64
Separation Corona Unit...................................................................... 6-65
6.8.2 PICK-OFF PAWL OPERATION ...................................................... 6-65
6.9 FUSING UNIT .......................................................................................... 6-66
6.9.1 OVERVIEW..................................................................................... 6-66
6.9.2 PAPER FEED THROUGH THE FUSING UNIT .............................. 6-67
6.9.3 FUSING PRESSURE CONTROL MECHANISM ............................ 6-68
6.9.4 HOT ROLLER THERMISTORS AND THERMOSTATS ................. 6-69
6.9.5 TEMPERATURE CONTROL .......................................................... 6-69
Paper Thickness Setting .................................................................... 6-69
Zero-Cross Control Test ..................................................................... 6-71
Switching on the Fusing Lamp Power ................................................ 6-71
Fusing Temperature Control: Warm-up Sequence............................. 6-72
Fusing Temperature Control: Temperature Feedback During Copying6-74
B286/B289 xii SM