Canon LBP 2460 Service Manual - Page 131

CHAPTER 2 E. Pick-up/Feed System 1. Outline Presence of paper in the paper deck is detected by the tray paper-out sensor (PS33), and the remaining amount of paper is detected by outputs from the paper-level sensing switch 1 (SW601) and paper-level sensing switch 2 (SW602). The combination of the two paper-level sensing switches is shown in table 2-10-1. The size of the paper is detected by a combination of 4 paper-size sensing switches (SW701 704), which are shown table 2-10-2. After receiving a pick-up command from the option controller the paper deck driver rotates the pick-up motor (SMT31), and simultaneously turns the pick-up solenoid (SL31) ON. The pick-up roller, feed roller1 and the separation roller then rotate sending a sheet of paper. The paper sent into the feed unit passes through the registration paper sensor (PS31) and stops momentarily at the registration roller. The registration clutch (CL32) is then turned ON, and the paper is sent through into the printer. The two photointerrupters (PS31,PS32) in the feed path detect the paper as it reaches and passes through them. If the paper does not reach or pass through the various sensors in the designated time, the paper deck driver assesses a paper jam and notifies the option controller while stopping the operation. Table 2-10-1 Paper-size sensing switch SW601 SW602 ON ON OFF ON OFF OFF ON OFF Remaining paper level Almost full High Low Almost empty Remaining paper % 100 75 50 25 Paper size Ledger A3 B4 Legal Letter A4 Cassette-size sensing switch SW701 SW702 SW703 SW704 OFF ON OFF OFF ON ON OFF OFF OFF OFF ON OFF OFF ON ON OFF OFF ON OFF ON ON ON OFF ON Table 2-10-2 2 - 85