COPYRIGHT © 1999 CANON INC. CANON 660/2100 REV.0 FEB. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)B. Pick-Up from the Multifeeder Tray1. OperationThe presence/absence of paper on the multifeeder tray is checked by the multifeed-er tray paper sensor (PS1301).In response to the PRNT* signal, the DC controller PCB starts the main motor (M4).At the same time, it turns on the holding plate solenoid (SL4) to free the holding plate (sothat it may move up), causing the pick-up roller to come into contact with the stack ofpaper.The up/down movement of the holding plate is checked by the holding plate sensor(PS1302). If the holding plate is up during the wait period, the holding plate solenoid(SL4) is turned on to bring down the holding plate.Thereafter, the multifeeder pick-up clutch (CL3) is turned on so that the drive of themain motor (M4) is transmitted to the multifeeder tray pick-up roller.The stack of paper butted against the multifeeder tray pick-up roller by the holdingplate gives up one sheet in response to the rotation of the pick-up roller. After the extrasheet, if any, has been removed by the work of the separation pad, the paper is movedinside the printer unit. The operations that follow are the same as in cassette pick-up;however, the holding plate solenoid (SL4) is additionally turned on immediately after theregistration roller starts to rotate to move down the holding plate.The multifeeder tray paper width sensor (PS1701) is mounted inside the feeder tray,detecting the width of paper in relation to the slide resistor operating in conjunction withthe size guide plate.The DC controller PCB detects the width of paper, if any on the multifeeder tray; if thepaper is of a width different from the width specified by the printer board*1, it will identifya paper size mismatch, and communicate the fact to the printer board1 and, at the sametime, issues a message on the printer control panel to warn the user.*1 Reader control PCB (when making prints with the reader unit installed).CHAPTER 5 PICK-UP/FEEDING SYSTEM5-16Download free service manual at http://printer1.blogspot.com
