1 Introduction 5
1.1. Specifications 5
1.2. Indicators 10
1.3. Parts Identification 12
1.4. Component Layout and Paper Path 13
1.5. Electrical Components and Sensor Boards 14
1.6. Switches and Solenoids 15
1.7. Print Process 16
1.8. Paper Feed 18
1.9. Laser Scan Unit ( Exposure ) 19
1.10. Fuser Unit 21
1.11. Paper Ejection and Paper Switchback 22
2 Installation, Setup, and Repacking 23
2.1. Installation Requirements 23
2.2. Setup 23
2.3. Repacking 26
3 Removal and Replacement Procedures 29
3.1. Front and Rear Covers 29
3.2. Right, Left and Top Covers 31
3.3. Laser Scanning Unit ( LSU ) 32
3.4. Relay Board (B) 32
3.5. High Voltage Board and Power Supply Unit 33
3.6. Indicator Board 35
3.7. Engine Control Board and Toner Empty Sensor Board 35
3.8. 2nd Feeder I / F Board and Main Control Board 37
3.9. Fuser Drive Gear 38
3.10. Fan Motor 38
3.11. Gear Support Bracket, Relay Board ( A ), Motor, Drive
Gear Unit and Paper Empty Sensor Board 39
3.12. Upper Exit Roller Holder 41
3.13. Fuser Unit 42
3.14. Pickup, Paper Feed, Registration and Transfer Rollers 46
3.15. Transfer Roller Assembly 48
3.16. Auto Duplex Unit, ADU Registration Roller and ADU Pinch
Roller 49
3.17. Registration Sensor Lever, Paper Top Detection Sensor
Lever and Registration & Paper Top Detection Sensor
Board 51
3.18. Paper Empty Sensor Lever 53
4 Electronic Circuit Description and Diagrams 54
4.1. Block Diagram 54
4.2. Connection Diagram 56
4.3. Power Supply 57
4.4. Engine Control Board 58
4.5. Main Control Board 74
5 Schematic Diagram 87
5.1. Main Control Board 89
5.2. Engine Control Board 99
5.3. Sensors, Indicator and Relay Boards 103
5.4. Paper Empty Sensor Board and 2nd Feeder I / F Board
105
6 Explanation of Connectors 107
6.1. Main Control Board 107
6.2. Engine Control Board 112
6.3. Registration & Paper Top Sensor Board 117
6.4. Paper Exit / ADU Paper Jam Sensor Board 117
6.5. Indicator Board 117
6.6. Relay Board ( B ) 118
6.7. Paper Empty Sensor Board 118
6.8. Toner Empty Sensor Board 118
6.9. 2nd Feeder I / F Board 119
7 Component Reference Guide 120
7.1. Main Control Board 120
7.2. Engine Control Board 127
8 Preventative Maintenance 131
8.1. General 131
8.2. Recommended Tools 131
8.3. Recommended Cleaning 131
8.4. Maintenance Tables 132
9 Troubleshooting 134
9.1. Self-Diagnostic Indicators 134
9.2. Initial Troubleshooting Flowchart 137
9.3. No Operation 138
9.4. Print Quality 139
9.5. Paper Jam 149
9.6. Call Service 155
10 Replacement Parts List with Lubrication Guide 167
10.1. Exterior 167
10.2. Right Side Parts 169
10.3. Left Side Parts ( Power Supply Unit and High Voltage
Board ) 174
10.4. Rear and Top Side Parts 175
10.5. Bottom Side Parts 178
10.6. Mechanical Base 180
10.7. Media Tray ( Paper Cassette ) 181
10.8. Packing 182
10.9. Main Control Board 183
10.10. Engine Control Board 188
10.11. Registration & Paper Top Detection Sensor Board 192
10.12. Paper Exit / ADU Paper Jam Sensor Board 192
10.13. Indicator Board 192
10.14. Toner Empty Sensor Board 193
10.15. Relay Board (A) 193
10.16. Relay Board (B) 193
10.17. Paper Empty Sensor Board 194
10.18. 2nd Feeder I / F Board 194
11 Schematic Diagram for printing with A4 size 195
11.1. Main Control Board 195
11.2. Engine Control Board 214
11.3. Sensors, Indicator and Relay Boards 221
11.4. Paper Empty Sensor Board and 2nd Feeder I / F Board
224
CONTENTS
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KX-P7105 / KX-P7110