Contents2.4.6Stitching Operation .................................................................................................................................... 2- 502.5 Stack Tray Operation ....................................................................................................................................... 2- 522.5.1Tray Operation........................................................................................................................................... 2- 522.5.2Shutter Operation....................................................................................................................................... 2- 552.6 Detecting Jams................................................................................................................................................. 2- 562.6.1Detecting Jams (Finisher Unit) .................................................................................................................. 2- 562.6.2Detecting Jams (Saddle Stitcher Unit)....................................................................................................... 2- 572.7 Power Supply................................................................................................................................................... 2- 612.7.1Power Supply Route (Finisher Unit) ......................................................................................................... 2- 612.7.2Protection Function (Finisher Unit)........................................................................................................... 2- 612.7.3Power Supply Route (Saddle Stitcher Unit) .............................................................................................. 2- 612.7.4Protection Function (Saddle Stitcher Unit)................................................................................................ 2- 62Chapter 3 Parts Replacement Procedure3.1 External Covers ................................................................................................................................................. 3- 13.1.1 Rear Lower Cover ....................................................................................................................................... 3- 13.1.1.1 Removing the Rear Lower Cover ........................................................................................................ 3- 13.1.2 Rear Upper Cover........................................................................................................................................ 3- 13.1.2.1 Removing the Rear Upper Cover......................................................................................................... 3- 13.1.3 Grate-shaped Upper Guide.......................................................................................................................... 3- 13.1.3.1 Removing the Front Door .................................................................................................................... 3- 13.1.3.2 Removing the Escape Tray Cover ....................................................................................................... 3- 13.1.3.3 Removing the Grate-shaped Upper Guide........................................................................................... 3- 23.1.4 Grate-shaped Lower Guide ......................................................................................................................... 3- 23.1.4.1 Removing the Front Door .................................................................................................................... 3- 23.1.4.2 Removing the Rear Upper Cover......................................................................................................... 3- 23.1.4.3 Removing the Escape Tray Cover ....................................................................................................... 3- 23.1.4.4 Removing the Front Inside Upper Cover............................................................................................. 3- 33.1.4.5 Removing the Grate-shaped Upper Guide........................................................................................... 3- 33.1.4.6 Removing the Tray 1 ........................................................................................................................... 3- 33.1.4.7 Removing the Tray 2 ........................................................................................................................... 3- 43.1.4.8 Removing the Grate-shaped Lower Guide .......................................................................................... 3- 63.1.5 Front Inside Upper Cover............................................................................................................................ 3- 63.1.5.1 Removing the Front Door .................................................................................................................... 3- 63.1.5.2 Removing the Escape Tray Cover ....................................................................................................... 3- 63.1.5.3 Removing the Front Inside Upper Cover............................................................................................. 3- 73.1.6 Front Inside Lower Cover ........................................................................................................................... 3- 73.1.6.1 Removing the Front Door .................................................................................................................... 3- 73.1.6.2 Removing the Escape Tray Cover ....................................................................................................... 3- 73.1.6.3 Removing the Front Inside Upper Cover............................................................................................. 3- 73.1.6.4 Removing the Front Inside Lower Cover ............................................................................................ 3- 73.1.7 PCB Cover................................................................................................................................................... 3- 83.1.7.1 Removing the PCB Cover.................................................................................................................... 3- 83.1.8 Front Door ................................................................................................................................................... 3- 83.1.8.1 Removing the Front Door .................................................................................................................... 3- 83.1.9 Escape Tray Cover ...................................................................................................................................... 3- 83.1.9.1 Removing the Escape Tray Cover ....................................................................................................... 3- 83.1.10 Escape Door .............................................................................................................................................. 3- 8