Canon L120 Series, Service Manual

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Contents
Contents
2.1 Document Feed and Exposure System...........................................................................................................................2-1
2.1.1 Overview/Configuration .............................................................................................................................................................. 2-1
2.1.1.1 Overview .........................................................................................................................................................................................................2-1
2.2 Laser Exposure...............................................................................................................................................................2-2
2.2.1 Overview/Configuration .............................................................................................................................................................. 2-2
2.2.1.1 Overview .........................................................................................................................................................................................................2-2
2.3 Image Formation ............................................................................................................................................................2-4
2.3.1 Overview/Configuration .............................................................................................................................................................. 2-4
2.3.1.1 Overview .........................................................................................................................................................................................................2-4
2.4 Pickup and Feed System ................................................................................................................................................2-5
2.4.1 Overview/Configuration .............................................................................................................................................................. 2-5
2.4.1.1 Overview .........................................................................................................................................................................................................2-5
2.4.2 Detection Jams ............................................................................................................................................................................. 2-5
2.4.2.1 Jam Detection Outline.....................................................................................................................................................................................2-5
2.4.2.1.1 Type so Jams ...........................................................................................................................................................................................2-5
2.4.2.2 Delay Jams ......................................................................................................................................................................................................2-6
2.4.2.2.1 Pickup Delay Jam....................................................................................................................................................................................2-6
2.4.2.2.2 Delivery Delay Jam.................................................................................................................................................................................2-6
2.4.2.3 Stationary Jams ...............................................................................................................................................................................................2-6
2.4.2.3.1 Pickup Stationary Jam.............................................................................................................................................................................2-6
2.4.2.3.2 Delivery Stationary Jam..........................................................................................................................................................................2-6
2.4.2.4 Other Jams.......................................................................................................................................................................................................2-6
2.4.2.4.1 Wrap Jam.................................................................................................................................................................................................2-6
2.4.2.4.2 Initial Jam................................................................................................................................................................................................2-6
2.4.2.4.3 Cover Open Jam......................................................................................................................................................................................2-6
2.5 Fixing Unit .....................................................................................................................................................................2-7
2.5.1 Overview/Configuration .............................................................................................................................................................. 2-7
2.5.1.1 Overview .........................................................................................................................................................................................................2-7
2.5.2 Various Control Mechanisms ...................................................................................................................................................... 2-7
2.5.2.1 Controlling the Temperature of the Fixing Unit .............................................................................................................................................2-7
2.5.2.1.1 Heater Temperature Control....................................................................................................................................................................2-7
2.5.3 Protective Function ...................................................................................................................................................................... 2-9
2.5.3.1 Protective Mechanisms ...................................................................................................................................................................................2-9
2.5.3.2 Detection of a Fault.........................................................................................................................................................................................2-9
2.6 External and Controls...................................................................................................................................................2-10
2.6.1 Power Supply ............................................................................................................................................................................. 2-10
2.6.1.1 Protection Function .......................................................................................................................................................................................2-10
2.6.1.1.1 Protective Mechanisms .........................................................................................................................................................................2-10
2.6.1.2 Backup Battery..............................................................................................................................................................................................2-10
2.6.1.2.1 Battery-backed up Data.........................................................................................................................................................................2-10