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41388601TH Rev.2 4 /
CONTENTS
1. SPECIFICATIONS ............................................................................................ 7
1.1 Basic System Configuration ............................................................................................. 7
1.2 Printer Engine Specifications ........................................................................................... 8
1.3 Option Configuration ........................................................................................................ 9
1.4 Specifications ................................................................................................................. 10
2. OPERATION DESCRIPTION ......................................................................... 12
2.1 Main Control Board (CRM-PWB) ................................................................................... 13
2.2 Engine Control Board (K73 PWB).................................................................................. 15
2.3 Power Units.................................................................................................................... 16
2.4 Mechanical Processes ................................................................................................... 17
2.4.1 Electrophotographic process ............................................................................ 18
2.4.2 Paper running process ..................................................................................... 22
2.5 Sensor............................................................................................................................ 31
2.5.1 Paper related sensors ...................................................................................... 31
2.5.2 Other sensors ................................................................................................... 32
2.6 Color Misalignment Correction....................................................................................... 33
2.7 Transfer Control Responds to Environmental Changes
(Room Temperatures and Relative Humidities) ............................................................. 33
2.8 Paper Jam Detection ..................................................................................................... 34
2.9 Cover Opening ............................................................................................................... 35
2.10 Toner Low Detection ...................................................................................................... 36
2.11 Paper Size Detection ..................................................................................................... 37
2.12 Operation at Power-on ................................................................................................... 38
2.12.1 Self-diagnostic test ........................................................................................... 38
2.13 Color Misalignment Detection ........................................................................................ 39
2.14 Version Read of Periodically Replaced Units ................................................................ 40
2.15 Life Counter for Replaceable Units ................................................................................ 40
2.16 Toner Consumption Detection ....................................................................................... 40
3. PARTS REPLACEMENT................................................................................ 41
3.1 Precautions in Replacing Parts ...................................................................................... 41
3.2 Parts Layout ................................................................................................................... 43
3.3 Replacing Parts..............................................................................................................50
3.3.1 Top cover.......................................................................................................... 51
3.3.2 LED Assy/ LED Assy spring ............................................................................. 52
3.3.3 Top cover unit ................................................................................................... 53
3.3.4 Control panel Assy/ Control panel bezel/ LED control PWB/ Toner sensor/
Stack full sensor/ Control panel tape harness/ Eject roller ............................... 54
3.3.5 Top cover handle/ Tope cover latch/ Top cover latch spring............................ 55
3.3.6 Eject guide Assy ............................................................................................... 56
3.3.7 Cassette Assy/ Blind cover/ Side cover R Assy ............................................... 57
3.3.8 Feed rollers....................................................................................................... 58
3.3.9 Left side cover .................................................................................................. 59
3.3.10 Face-up tray ..................................................................................................... 60
3.3.11 Front cover ....................................................................................................... 61
3.3.12 Rear cover ........................................................................................................ 62
3.3.13 Multipurpose tray Assy/ Multipurpose tray cover Assy/ Links/
Multipurpose tray top cover/ Multipurpose tray drive gear................................ 63
3.3.14 Drum contact Assys.......................................................................................... 64
3.3.15 Registration roller Assy (A)/ Registration drive gear (A)................................... 65