Canon MF4100 Series Service Manual

Contents

Canon MF4100 Series Service Manual Manual pdf 75 page image

Chapter 77-3PS801: Leading edge sensorPS802: Paper width sensorPS803: Delivery sensorPS804: Delivery paper width sensor7.3 Detection Jams7.3.1 Jam Detection Outline7.3.1.1 Overview 0014-5491i-SENSYS MF4150 / i-SENSYS MF4140 / i-SENSYS MF4120 /The machine has the following paper sensors to detect the presence/absence of paper at the time of startup, opening the door, or feeding a paper, as well as to detectwhether a paper is fed normally.1. Leading edge sensor (PS801)2. Paper width sensor (PS802)3. Delivery sensor (PS803)4. Delivery paper width sensor (PS804)In terms of jam, it is judged by whether a paper is at the sensor assembly at the time of the check time memorized in the CPU beforehand. If the CPU judges as theoccurrence of jam, the printing operation is aborted and at the same time, it notifies it to the SCNT board.7.3.2 Delay Jams7.3.2.1 Pickup Delay Jam 0014-5497i-SENSYS MF4150 / i-SENSYS MF4140 / i-SENSYS MF4120 /In order to prevent the pickup delay jam due to the pickup failure, the machine executes the retry control that performs the pickup operation up to twice.In the second pickup operation, if the leading edge sensor (PS801) cannot detect the leading edge of paper within about 1.45 sec since the pickup solenoid (SL1)turns ON, the DCNT board judges as the pickup delay jam.7.3.2.2 Delivery Delay Jam 0014-5503i-SENSYS MF4150 / i-SENSYS MF4140 / i-SENSYS MF4120 /If the delivery sensor (PS803) cannot detect the leading edge of paper after passing about 1.65 sec from the detection of the leading edge of paper with the leadingedge sensor (PS801), the DCNT board judges as the delivery delay jam.7.3.3 Stationary Jams7.3.3.1 Pickup Stationary Jam 0014-5505i-SENSYS MF4150 / i-SENSYS MF4140 / i-SENSYS MF4120 /If the trailing edge of paper cannot be detected after passing about 5.4 sec since the leading edge sensor (PS801) detects the leading edge of paper, the DCNT boardjudges as the pickup stationary jam.7.3.3.2 Delivery Stationary Jam 0014-5508i-SENSYS MF4150 / i-SENSYS MF4140 / i-SENSYS MF4120 /If the delivery sensor (PS803) cannot detect the leading edge of paper within about 1.48 sec after the leading edge sensor (PS801) detects the trailing edge of paper,the DCNT board judges as the delivery stationary jam.7.3.4 Other Jams7.3.4.1 Door Open Jam 0014-5514i-SENSYS MF4150 / i-SENSYS MF4140 / i-SENSYS MF4120 /If the leading edge sensor (PS801) or the delivery sensor (PS803) detects a paper when door open is detected, the DCNT board judges as the door open jam.7.3.4.2 Wrapping Jam 0014-5515i-SENSYS MF4150 / i-SENSYS MF4140 / i-SENSYS MF4120 /CPU executes the wrapping jam detection after it judges there is no delivery delay jam present.If the delivery sensor (PS803) detects the trailing edge of paper within the predetermined time (from after about 0.08 sec since the detection of the paper leadingedge by the delivery sensor (PS803) until about 1.09 sec after the detection of the paper trailing edge y the leading edge sensor (PS801)), CPU judges as the wrappingjam.If it judges as the wrapping jam, it notifies the occurrence of the delivery stationary jam to the SCNT board.