9.1 Construction..................................................................................................................................................... 9- 1

9.1.1 Outline ....................................................................................................................................................... 9- 1

9.1.2 Major Components .................................................................................................................................. 9- 1

9.1.3 Overview of the Fixing Drive System.................................................................................................... 9- 2

9.1.4 Controlling the Fixing Roller Drive ........................................................................................................ 9- 3

9.1.5 Controlling the Cleaning Web Drive...................................................................................................... 9- 3

9.1.6 Controlling the Thermistor Reciprocating Mechanism ....................................................................... 9- 4

9.1.7 Controlling the Upper Separation Claw Reciprocating Mechanism................................................. 9- 4

9.1.8 Controlling the Fixing Inlet Sensor Drive.............................................................................................. 9- 5

9.2 Basic Sequence .............................................................................................................................................. 9- 6

9.2.1 Basic Sequence of Operations .............................................................................................................. 9- 6

9.3 Various Control Mechanisms........................................................................................................................ 9- 7

9.3.1 Controlling the Fixing Roller Temperature ........................................................................................... 9- 7

9.3.1.1 Controlling the Down Sequence..................................................................................................... 9- 7

9.3.1.2 Transparency Mode ......................................................................................................................... 9- 8

9.3.1.3 Heavy Paper Mode........................................................................................................................... 9- 8

9.3.1.4 Power Save Mode ............................................................................................................................ 9- 9

9.4 Protective Functions..................................................................................................................................... 9- 10

9.4.1 Error Detection ....................................................................................................................................... 9- 10

9.5 Parts Replacement Procedure ................................................................................................................... 9- 12

9.5.1 Fixing Unit................................................................................................................................................ 9- 12

9.5.2 Upper Fixing Roller ................................................................................................................................ 9- 13

9.5.3 Lower Fixing Roller ................................................................................................................................ 9- 14

9.5.4 External Delivery Roller......................................................................................................................... 9- 15

9.5.5 Internal Delivery Roller .......................................................................................................................... 9- 16

9.5.6 Main Thermistor...................................................................................................................................... 9- 16

9.5.7 Sub Thermistor ....................................................................................................................................... 9- 17

9.5.8 Thermal Switch ....................................................................................................................................... 9- 17

9.5.9 Fixing Heater........................................................................................................................................... 9- 18

9.5.10 Fixing Cleaning Belt ............................................................................................................................. 9- 19

9.5.11 Claw Jam Sensor ................................................................................................................................. 9- 20

9.5.12 External Delivery Sensor..................................................................................................................... 9- 20

9.5.13 Internal Delivery Sensor ...................................................................................................................... 9- 21

9.5.14 Reversal Sensor ................................................................................................................................... 9- 21

9.5.15 Fixing Inlet Sensor ............................................................................................................................... 9- 21

9.5.16 Fixing/Feeding Outlet Sensor............................................................................................................. 9- 22

9.5.17 Delivery Speed Switch Clutch ............................................................................................................ 9- 22

9.5.18 Upper Separation Claw ....................................................................................................................... 9- 23

9.5.19 Lower Separation Claw ....................................................................................................................... 9- 23

Contents

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