8.6.4 Outline of Paper Level Detection........................................................................................................................... 8- 23

8.6.5 Paper Level Detection Operation (right/left deck).................................................................................................. 8- 23

8.6.6 Identifying the Size of Paper (right/left deck)......................................................................................................... 8- 24

8.7 Registration Unit .......................................................................................................................................8- 25

8.7.1 Outline ................................................................................................................................................................... 8- 25

8.7.2 Control System ...................................................................................................................................................... 8- 25

8.8 Duplex Feeding Unit .................................................................................................................................8- 26

8.8.1 Moving the Paper to the Reversing Assembly After Printing on the 1st Side........................................................ 8- 26

8.8.2 Moving the Paper to the Duplexing Feed Assembly From the Reversing Assembly ............................................ 8- 26

8.8.3 Outline ................................................................................................................................................................... 8- 27

8.8.4 Sequence of Printing Operation ............................................................................................................................ 8- 27

8.8.5 Outline of Through-Path Operation ....................................................................................................................... 8- 28

8.8.6 Through-Path Operation........................................................................................................................................ 8- 28

8.8.7 Outline of Horizontal Registration Position ............................................................................................................ 8- 32

8.8.8 Horizontal Registration Position Detection Operation ........................................................................................... 8- 33

8.9 Delivery.....................................................................................................................................................8- 34

8.9.1 Reversal Delivery Operation.................................................................................................................................. 8- 34

8.10 Parts Replacement Procedure................................................................................................................8- 36

8.10.1 Pickup Roller........................................................................................................................................................ 8- 36

8.10.1.1 Removing the Right Deck/ Cassette Pickup Assembly........................................................................................................ 8- 36

8.10.1.2 Removing the Left Deck Pickup Assembly .......................................................................................................................... 8- 36

8.10.1.3 Removing the Pickup Roller................................................................................................................................................. 8- 36

8.10.1.4 Orientation of the Deck/Cassette Pickup Roller ................................................................................................................... 8- 36

8.10.2 Cassette Pickup Assembly .................................................................................................................................. 8- 37

8.10.2.1 Removing the Right Deck/ Cassette Pickup Assembly........................................................................................................ 8- 37

8.10.3 Cassette Pickup Motor......................................................................................................................................... 8- 37

8.10.3.1 Removing the Rear Cover (upper) ....................................................................................................................................... 8- 37

8.10.3.2 Removing the Rear Cover (lower)........................................................................................................................................ 8- 38

8.10.3.3 Removing the Main Controller Box ...................................................................................................................................... 8- 38

8.10.3.4 Removing the Right Cover (lower rear)................................................................................................................................ 8- 39

8.10.3.5 Removing the Waste Toner Bottle Holder............................................................................................................................ 8- 39

8.10.3.6 Removing the Motor Driver PCB Base................................................................................................................................. 8- 40

8.10.3.7 Removing the Cassette Pickup Motor.................................................................................................................................. 8- 40

8.10.4 Cassette Lifter Motor ........................................................................................................................................... 8- 40

8.10.4.1 Removing the cassette right cover....................................................................................................................................... 8- 40

8.10.4.2 Removing the Lifter Motor M20 of the Cassette 3................................................................................................................ 8- 40

8.10.4.3 Removing the Lifter Motor M21 of the Cassette 4................................................................................................................ 8- 40

8.10.4.4 Adjusting the Position of the Lifter Motor M20 (M21) of the Cassette 3 (cassette 4) ........................................................... 8- 41

8.10.5 Left Deck Lifter Motor .......................................................................................................................................... 8- 41

8.10.5.1 Removing the Rear Cover (lower)........................................................................................................................................ 8- 41

8.10.5.2 Removing the HVT PCB ...................................................................................................................................................... 8- 41

8.10.5.3 Removing the Left Deck Lifter Motor.................................................................................................................................... 8- 42

8.10.6 Right Deck Lifter Motor ........................................................................................................................................ 8- 42

8.10.6.1 Removing the Rear Cover (upper) ....................................................................................................................................... 8- 42

8.10.6.2 Removing the Rear Cover (lower)........................................................................................................................................ 8- 42

8.10.6.3 Removing the Main Controller Box ...................................................................................................................................... 8- 43

8.10.6.4 Removing the Right Cover (lower rear)................................................................................................................................ 8- 43

8.10.6.5 Removing the Waste Toner Bottle Holder............................................................................................................................ 8- 44

8.10.6.6 Removing the Motor Driver PCB Base................................................................................................................................. 8- 44

8.10.6.7 Removing the High-Voltage Power Supply PCB.................................................................................................................. 8- 44

8.10.6.8 Removing the Right Deck Lifter Motor ................................................................................................................................. 8- 45

8.10.7 Right Deck Pickup Assembly............................................................................................................................... 8- 45

8.10.7.1 Removing the Right Deck/ Cassette Pickup Assembly........................................................................................................ 8- 45

8.10.8 Left Deck Pickup Assembly ................................................................................................................................. 8- 46

8.10.8.1 Removing the Left Deck Pickup Assembly .......................................................................................................................... 8- 46

8.10.9 Left Deck Pickup Motor........................................................................................................................................ 8- 46

8.10.9.1 Removing the Rear Cover (lower)........................................................................................................................................ 8- 46

8.10.9.2 Removing the High-Voltage Power Supply PCB.................................................................................................................. 8- 46

8.10.9.3 Removing the Left Deck Pickup Motor................................................................................................................................. 8- 47

Contents

Table of Contents