Samsung SCX-340x series Service Manual

Also see for SCX-340x Series: User guide Manual Del Usuario User manual

Contents

2. Product specification and description2.2.6. Engine F/W Contol Algorithm2.2.6.1. FeedingIf feeding from a tray, the drive of the pickup roller is controlled by controlling the clutch. The on/off of the clutch iscontrolled by controlling the general output port or the external output port. While paper moves, occurrence of Jamis judged as below.Item DescriptionJAM 0orPaper Empty• After picking up, paper does not reach the Feed Sensor within a predetermined time.• After picking up, if the feed sensor is not on, re-pick up will be initiated. After re-picking up, if thefeed sensor is not on after certain time, it is JAM 0• Even though the paper reaches to the feed sensor, the feed sensor does not detect the lead edge ofthe paper.JAM 1 • After the leading edge of the paper passes the feed sensor, the trailing edge of the paper does not clearthe sensor the feed sensor after predetermined period of time.2.2.6.2. TransferThe charging voltage, developing voltage and the transfer voltage are controlled by PWM (Pulse Width Modulation). Theeach output voltage is changeable due to the PWM duty. The transfer voltage admitted when the paper passes the transferroller is decided by environment conditions. The resistance value of the transfer roller is changed due to the surroundingenvironment or the environment of the set, and the voltage value, which changes due to the environment, is changed throughthe AD converter. The voltage value for impressing to the transfer roller is decided by the changed value.2-35 Copyright© 1995-2011 SAMSUNG. All rights reserved.