Table of contents

1 Theory of operation ..........................................................................................................

1

Basic operation ........................................................................................................................

2

Sequence of operation ...............................................................................................

3

Engine control system ...............................................................................................................

4

DC controller ............................................................................................................

5

Solenoids ..................................................................................................

6

Clutches ....................................................................................................

6

Switches ...................................................................................................

6

Sensors .....................................................................................................

7

Motors and fans .........................................................................................

7

High voltage power supply ......................................................................................

10

Low voltage power supply ........................................................................................

12

Overcurrent/overvoltage protection ............................................................

14

Safety .....................................................................................................

14

Sleep (powersave) mode ...........................................................................

14

Power supply voltage detection ..................................................................

14

Low voltage power supply failure ...............................................................

14

Power off condition ..................................................................................

15

Fuser control ...........................................................................................................

15

Fuser temperature control circuit .................................................................

16

Fuser over temperature protection ...............................................................

17

Fuser failure detection ...............................................................................

18

Laser/scanner system .............................................................................................................

19

Image formation system ..........................................................................................................

21

Image formation process ..........................................................................................

22

Step 1: Pre-exposure .................................................................................

23

Step 2: Primary charging ..........................................................................

23

Step 3: Laser-beam exposure .....................................................................

24

Step 4: Development ................................................................................

24

Step 5: Primary transfer ............................................................................

25

Step 6: Secondary transfer ........................................................................

25

Step 7: Separation ...................................................................................

26

ENWW

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