Hp LASERJET1200 User Manual

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hp LaserJet 1200 series

service

HP LaserJet 1200 Series

Service

Part number C7044-90906 First edition, April 2001 Printed in USA

Warranty

The information contained in this document is subject to change without notice.

Hewlett-Packard makes no warranty of any kind with respect to this information. HEWLETT-PACKARD SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

Hewlett-Packard shall not be liable for any direct, indirect, incidental, consequential, or other damage alleged in connection with the furnishing or use of this information.

NOTICE TO U.S. GOVERNMENT USERS: RESTRICTED RIGHTS COMMERCIAL COMPUTER SOFTWARE: “Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c) (1)(ii) of the Rights in Technical Data Clause at DFARS 52.227-7013.”

Trademark Credits

Microsoft, Windows, and MSDOS are U.S. registered trademarks of Microsoft Corporation.

TrueType is a U.S. trademark of Apple Computer, Inc.

All other products mentioned herein may be trademarks of their respective companies.

Safety Information WARNING! Potential Shock Hazard

Always follow basic safety precautions when using this product to reduce risk of injury from fire or electric shock.

1 Read and understand all

instructions in the user guide.

2 Observe all warnings and

instructions marked on the product.

3 Use only a grounded

electrical outlet when connecting the HP LaserJet 1200 printer to a power source. If you don’t know whether the outlet is grounded, check with a qualified electrician.

4 Do not touch the contacts

on the end of any of the sockets on the HP LaserJet 1200 printer. Replace damaged cords immediately.

5 Unplug this product from

wall outlets before cleaning.

6 Do not install or use this

product near water or when you are wet.

7 Install the product securely

on a stable surface.

8 Install the product in a

protected location where no one can step on or trip over the power cord and the power cord will not be damaged.

9 If the product does not

operate normally, see the online user guide.

10 Refer all servicing

questions to qualified personnel.

Information regarding FCC Class B, Parts 15 and 68 requirements can be found in the user guide.

Hewlett-Packard Company 11311 Chinden Boulevard Boise, Idaho 83714 U.S.A.

1 Product information

Chapter contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Hardware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Firmware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Product specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Model and serial numbers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Overview of printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Front and side view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Back and side view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Overview of optional copier/scanner. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Top view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Warranty statement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Extended warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Toner cartridge information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Refilled toner cartridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Recycling toner cartridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

2 Installation and operation

Chapter contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Operating environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Identifying printer components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Printer control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Control panel light patterns. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Copier/scanner control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Selecting media. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Selecting media to print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Selecting media to copy or scan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Loading media. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Loading media to print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Loading media to copy or scan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Printer output paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Contents 3

3 Maintenance

Chapter contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Life expectancies of consumables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

User-replaceable parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Replacing the printer pickup roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Replacing the printer separation pad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Replacing the copier/scanner separation pad . . . . . . . . . . . . . . . . . . . . . . . 45

Cleaning the equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Cleaning the print path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Cleaning the toner cartridge area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Cleaning the printer pickup roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

Cleaning the printer separation pad . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Cleaning and recalibrating the copier/scanner . . . . . . . . . . . . . . . . . . . . . . . 51

Cleaning the scanner path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

4 Operational overview

Chapter contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Basic functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

Formatter system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Draft mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

MEt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

Enhanced I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56

PJL overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

Printer functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Engine control unit/power system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Image formation system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Printer paper-feed system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Jam detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Optional copier/scanner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Optical system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Document pickup and feed systems. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Basic sequence of operation (formatter-to-printer). . . . . . . . . . . . . . . . . . . . 73

5 Removal and replacement

Chapter contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Removal and replacement strategy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Required tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Before performing service. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Toner cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Parts removal order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

4 Contents

Covers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Left side cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Optional copier/scanner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81

Back cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Right side cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

Top cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Control panel assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Front cover assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Internal assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Transfer roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Formatter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Laser/scanner assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Fuser assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

Output rollers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105

Motor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Solenoid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Fan assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

Right plate assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

Pickup assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Pickup roller shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Paper lift plate assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

Left plate assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Bottom assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

ECU pan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Paper-feed assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

6 Troubleshooting

Chapter contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

Basic troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Control panel light messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Fatal error secondary messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

Checking the toner cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

Solving image-quality problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

Solving paper-feed problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

Solving print paper-feed problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

Solving copying and scanning paper-feed problems . . . . . . . . . . . . . . . . . 148

Functional checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

Engine test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

Half self-test functional check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150

Drum rotation functional check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

Heating element check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152

High-voltage power supply check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

Paper path check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

Contents 5

Service mode functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

NVRAM initialization/cold reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

PJL software commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

Troubleshooting tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

Internal reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

Repetitive image defect ruler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

Main wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

Locations of connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

Locations of LEDs, jumpers, and switches. . . . . . . . . . . . . . . . . . . . . . . . . 165

7 Parts and diagrams

Chapter contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

Ordering parts and supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

Related documentation and software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

Consumables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

How to use the parts lists and diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

Common hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

Assembly locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172

Printer trays & optional copier/scanner . . . . . . . . . . . . . . . . . . . . . . . . . . . 172

Covers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174

Internal assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176

Internal components (1 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176

Internal components (2 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

Electrical components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180

Paper pickup assembly (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

Paper pickup assembly (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184

Fuser assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186

Alphabetical parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188

Numerical parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

6 Contents

Figures

Figure 1. Model and serial number labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Figure 2. Front and side view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Figure 3. Back and side view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Figure 4. Top view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Figure 5. Dimensions of printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Figure 6. Dimensions of printer with optional copier/scanner . . . . . . . . . . . . . . . 28

Figure 7. Printer control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Figure 8. Light status legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Figure 9. Copier/scanner control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Figure 10. Scanning a business card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Figure 11. Output bin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Figure 12. Straight-through output door. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Figure 13. Basic configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54

Figure 14. Printer unit functional block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Figure 15. ECU loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Figure 16. Overview of laser/scanner operation . . . . . . . . . . . . . . . . . . . . . . . . . . 61

Figure 17. High-voltage power supply circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Figure 18. Image formation block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Figure 19. Printer path. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Figure 20. Solenoid, photosensors, and switches . . . . . . . . . . . . . . . . . . . . . . . . . 70

Figure 21. Copier/scanner path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Figure 22. General timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Figure 23. Removing the toner cartridge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Figure 24. Removing the left side cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Figure 25. Removing the optional copier/scanner. . . . . . . . . . . . . . . . . . . . . . . . . 81

Figure 26. Removing the back cover (1 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Figure 27. Removing the back cover (2 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

Figure 28. Removing the right side cover (1 of 3) . . . . . . . . . . . . . . . . . . . . . . . . . 84

Figure 29. Removing the right side cover (2 of 3) . . . . . . . . . . . . . . . . . . . . . . . . . 85

Figure 30. Removing the right side cover (3 of 3) . . . . . . . . . . . . . . . . . . . . . . . . . 86

Figure 31. Removing the top cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Figure 32. Removing the control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

Figure 33. Removing the front cover (1 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Figure 34. Removing the front cover (2 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90

Figure 35. Removing the toner cartridge door (1 of 2). . . . . . . . . . . . . . . . . . . . . . 91

Figure 36. Removing the toner cartridge door (2 of 2). . . . . . . . . . . . . . . . . . . . . . 92

Figure 37. Removing the front guide assembly (1 of 3). . . . . . . . . . . . . . . . . . . . . 93

Figure 38. Removing the front guide assembly (2 of 3). . . . . . . . . . . . . . . . . . . . . 94

Figure 39. Removing the front guide assembly (3 of 3). . . . . . . . . . . . . . . . . . . . . 95

Figure 40. Removing the transfer roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Figure 41. Removing the formatter (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97

Figures 7

Figure 42. Removing the formatter (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98

Figure 43. Removing the laser/scanner (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Figure 44. Removing the laser/scanner (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . 100

Figure 45. Removing the fuser assembly (1 of 4) . . . . . . . . . . . . . . . . . . . . . . . . 101

Figure 46. Removing the fuser assembly (2 of 4) . . . . . . . . . . . . . . . . . . . . . . . . 102

Figure 47. Removing the fuser assembly (3 of 4) . . . . . . . . . . . . . . . . . . . . . . . . 103

Figure 48. Removing the fuser assembly (4 of 4) . . . . . . . . . . . . . . . . . . . . . . . . 104

Figure 49. Removing the output rollers (1 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . 105

Figure 50. Removing the output rollers (2 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . 106

Figure 51. Removing the motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Figure 52. Removing the solenoid (1 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Figure 53. Removing the solenoid (2 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

Figure 54. Removing the fan (1 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

Figure 55. Removing the fan (2 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Figure 56. Removing the right plate assembly (1 of 2) . . . . . . . . . . . . . . . . . . . . 112

Figure 57. Removing the right plate assembly (2 of 2) . . . . . . . . . . . . . . . . . . . . 113

Figure 58. Removing the pickup assembly (1 of 3) . . . . . . . . . . . . . . . . . . . . . . . 114

Figure 59. Removing the pickup assembly (2 of 3) . . . . . . . . . . . . . . . . . . . . . . . 115

Figure 60. Removing the pickup assembly (3 of 3) . . . . . . . . . . . . . . . . . . . . . . . 116

Figure 61. Removing the pickup roller shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Figure 62. Removing the paper lift plate assembly . . . . . . . . . . . . . . . . . . . . . . . 118

Figure 63. Removing the left plate assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Figure 64. Removing the ECU pan (1 of 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Figure 65. Removing the ECU pan (2 of 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Figure 66. Removing the ECU pan (3 of 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Figure 67. Removing the ECU pan (4 of 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Figure 68. Removing the paper-feed assembly (1 of 4) . . . . . . . . . . . . . . . . . . . 124

Figure 69. Removing the paper-feed assembly (2 of 4) . . . . . . . . . . . . . . . . . . . 125

Figure 70. Removing the paper-feed mechanism (3 of 4) . . . . . . . . . . . . . . . . . . 126

Figure 71. Removing the paper-feed mechanism (4 of 4) . . . . . . . . . . . . . . . . . . 127

Figure 72. Control panel location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Figure 73. Engine test switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

Figure 74. Locating connectors for the heating element check . . . . . . . . . . . . . . 152

Figure 75. Toner cartridge high-voltage connection points (right side) . . . . . . . . 153

Figure 76. Toner cartridge high-voltage connection points (left side) . . . . . . . . . 153

Figure 77. High-voltage connector assembly (right side) . . . . . . . . . . . . . . . . . . 154

Figure 78. High-voltage connector assembly (left side). . . . . . . . . . . . . . . . . . . . 154

Figure 79. Overriding SW301 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

Figure 80. Self-test page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

Figure 81. Repetitive image defect ruler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

Figure 82. Main wiring (1 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

Figure 83. Main wiring (2 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

Figure 84. Locations of printer connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

Figure 85. Locations of copier/scanner connectors. . . . . . . . . . . . . . . . . . . . . . . 164

Figure 86. Locations of LEDs, jumpers, and switches. . . . . . . . . . . . . . . . . . . . . 165

Figure 87. Assembly locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172

Figure 88. Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174

8 Figures

Figure 89. Internal components (1 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176

Figure 90. Internal components (2 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

Figure 91. Electrical components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180

Figure 92. Paper pickup assembly (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

Figure 93. Paper pickup assembly (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184

Figure 94. Fuser assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186

Figures 9

10 Figures

Tables

Table 1. Physical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 2. Environmental specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Table 3. Power specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Table 4. Performance of HP LaserJet 1200 printer . . . . . . . . . . . . . . . . . . . . . . 17

Table 5. Performance of optional copier/scanner. . . . . . . . . . . . . . . . . . . . . . . . 17

Table 6. Print operating acoustical emissions specifications . . . . . . . . . . . . . . . 18

Table 7. Copy operating acoustical emissions specifications. . . . . . . . . . . . . . . 18

Table 8. Skew specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Table 9. Control panel light messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Table 10. Media types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Table 11. Life expectancies of consumables . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Table 12. Basic sequence of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

Table 13. Basic troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Table 14. Control panel lights legend. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Table 15. Control panel light messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

Table 16. Fatal error secondary messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

Table 17. Solving print image-quality problems . . . . . . . . . . . . . . . . . . . . . . . . . 138

Table 18. Solving copying and scanning image-quality problems . . . . . . . . . . . 143

Table 19. Solving print paper-feed problems . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

Table 20. Solving copying and scanning paper-feed problems . . . . . . . . . . . . . 148

Table 21. NVRAM PJL factory variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

Table 22. Switch functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

Table 23. Technical support websites . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168

Table 24. Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

Table 25. Common fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

Table 26. Printer trays and optional copier/scanner. . . . . . . . . . . . . . . . . . . . . . 173

Table 27. Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

Table 28. Internal components (1 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

Table 29. Internal components (2 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179

Table 30. Electrical components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Table 31. Paper pickup assembly (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

Table 32. Paper pickup assembly (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Table 33. Fuser assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Table 34. Alphabetical parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188

Table 35. Numerical parts list. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191

Tables 11

12 Chapter - Tables

Product information

Chapter contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Hardware description . . . . . . . . . . . . . . . . . . . . . . . . . .14

Firmware description . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Product specifications. . . . . . . . . . . . . . . . . . . . . . . . . .16

Model and serial numbers . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Overview of printer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

Front and side view . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Back and side view. . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Overview of optional copier/scanner . . . . . . . . . . . . . . . . . . . 22

Top view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Warranty statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Extended warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Toner cartridge information . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Refilled toner cartridges . . . . . . . . . . . . . . . . . . . . . . . .25

Recycling toner cartridges . . . . . . . . . . . . . . . . . . . . . .25

Chapter contents 13

Introduction

The HP LaserJet 1200 printer is designed to:

With the optional copier/scanner, you can:

Hardware description

The printer provides 1200 dot-per-inch (dpi) printin g. The optional copier/scanner scans at 600 dpi/ 24-bits per pixel (bpp) and contains a document feeder that holds up to 30 pages.

The printer prints 15 pages per minute (ppm) on letter-size paper or 14 ppm on A4. With 1200 dpi printing resolution, the printer has exceptional text and graphics print quality. The simp le co nt ro l pan el and improved paper handling make this prod u c t ver y ea sy to use.

The printer’s main input tray has a 250-sheet capacity for continu ous, multiple-page printing. Manual, single-sheet printing is possible through the priority input tray. Both trays are center-justified for all supported paper sizes. The printer output bin holds up to 125 sheets.

Print—Print documents easily with the laser-quality you have come to expect from an HP LaserJet printer.

Copy—Make superior laser-quality copies. With the software, you can make up to 99 copies of a 30-p age original. You can also enlarge, reduce, adjust contrast, and collate.

Scan—Scan important documents to create electronic files.

The printer has a very fast first-page-out , at less than 10 seconds. The formatter board contains 8 MB of ROM, 8 MB of RAM, and an embedded 32-bit Coldfire V3 processor. There is one DIMM slot available for DIMM expansion (supporting an 8 MB, 16 MB, 32 MB, or 64 MB DIMM).

The printer engine has a 1,000 average (10,00 0 peak) page-permonth duty cycle. For the printer, the standard to ner life is 2,500 pages, and the high capacity toner life is 3,500 pages.

14 Chapter 1 - Product information

Firmware description

The firmware in the printer includes:

Enhanced PCL 6 with status readback

! 80 TrueType™ fonts, plus Cyrillic, Greek, Hebrew, and Arabic ! Pixel placement, mosaic characters

Memory Enhancement technology (MEt) with ha rd wa re

compression and decompression

The printer firmware also has REt and EconoMode function ality. Scan capability includes 600 dpi and 24-bit color.

Introduction 15

Product specifications

Table 1. Physical specifications

Category Specification

Height 253 mm (10 inches) without optional copier/

scanner 416 mm (16.4 inches) with optional copier/ scanner

Depth 486 mm (19.1 inches) Width 415 mm (16.3 inches) Weight (cartridge

installed)

Table 2. Environmental specifications

Category Specification

Operating environment (printer plugged into an AC outlet)

Storage environment (printer not plugged into an AC outlet)

7.3 kg (16.1 lb) without optional copier/scanner

8.7 kg (19.2 lb) with optional copier/scanner

! Temperature: 15° to 32.5° C (59° to 90.5° F) ! Humidity: 20% to 80% relative humidity

(no condensation)

! Temperature: 0° to 40° C (32° to 104° F) ! Humidity: 10% to 90% relative humidity

(no condensation)

16 Chapter 1 - Product information

Table 3. Power specifications

Category Specification

Power requirements

! 110 Vac (± 12%), 60 (± 3) Hz; 127 Vac

(± 12%), 60 (± 3) Hz

-Or-

! 220 Vac (± 12%), 50/60 (± 3) Hz ! 240 Vac (± 12%), 50 (± 3) Hz

Power sources are not interchangeable.

Power consumption (in continuous copy mode)

Power consumption (idle)

Power consumption (off)

Minimum recommended circuit capacity

Note

285 W

7 W

0 W

4.5 A at 115 V

2.3 A at 230 V

Table 4. Performance of HP LaserJet 1200 printer

Category Specification

Print resolution 1200 dpi Print speed 15 ppm (Letter)

14 ppm (A4)

Table 5. Performance of optional copier/scanner

Category Specification

Scan resolution 600 dpi optical, with 256 levels of gray and 24-bit

color

Copy speed 12 ppm

Introduction 17

Table 6. Print operating acoustical emissions specifications

Category Specification

Sound Power Level, L

(1 bel = 10 decibels)

WAd

Sound Pressure Level,

(operator position)

pAm

Sound Pressure Level,

(bystander position)

pAm

6.1 B(A)

56 dB(A)

48 dB(A)

Table 7. Copy operating acoustical emissions specifications

Category Specification

Sound Power Level,

(1 bel = 10 decibels)

WAd

Sound Pressure Level,

(operator position)

pAm

Sound Pressure Level,

(bystander position)

pAm

6.4 B(A)

60 dB(A)

50 dB(A)

Table 8. Skew specifications

Category Specification

Print skew—left 0.8% (2 mm over 250 mm in length) for

Print skew—right 1.5% (3.3 mm over 220 mm in width) for

Cut-sheet leading edge skew

Scan skew 1.2%

18 Chapter 1 - Product information

cut-sheet media)

1.5% (3.3 mm over 220 mm in length) for cut-sheet media

0.87 (1.65 mm over 190 mm in width) for cut-sheet media

envelopes, postcards, A5, and cut-sheet media

0.87% (1.6 mm over 190 mm in width)

Model and serial numbers

The model number and serial number are listed on an identification label located on the inside of the toner cartridge door.

The serial number contains information about the country of origin, revision level, production code, and production number of the printer.

The label also contains power rating and regulatory information.

Figure 1. Model and serial number labels

Model and serial numbers 19

Overview of printer

Front and side view

Figure 2. Front and side view

1 Printer control pan el

2 Long media extension (output bin) 3 Toner cartridge door 4 Priority input tray 5 Side media guides for the main input tray 6 Media support for the main input tray 7 Main input tray 8 Side media guides for the priority input tray

20 Chapter 1 - Product information

Back and side view

Figure 3. Back and side view

9 Fuser pressure release levers 10 Connection to optional copier/scanner 11 Left side cover 12 Parallel port 13 USB port 14 Power receptacle

15 Power switch (220-240 volt printers) 16 Straight-through output door

Overview of printer 21

Overview of optional copier/scanner

Top view

Figure 4. Top view

1 Media input tray guides 2 Copier/scanner door 3 Straight-through output door

4 Copier/scan ne r door rele a se bu tt on 5 Long media extensions 6 Media output bin 7 Copier/scanner control panel 8 Media input tray

Note See “Optional copier/ scanner” on page 81 for more information about

removing the optional copier/scanner from the printer.

22 Chapter 1 - Product information

Warranty statement

DURATION OF WARRANTY: One year from date of purchase.

1 HP warrants to you, the end-user customer, that HP hardware, accessories, and

supplies, will be free from defects in materials and workmanship after the date of purchase, for the period specified above. If HP receives notice of such defects during the warranty period, HP will, at its option, either repair or replace products which prove to be defective. Replacement products may be either new or like-new.

2 HP warrants to you that HP software will not fail to execute its programming

instructions after the date of purchase, fo r the period specified above, due to defects in material and workmanship when properly installed and used. If HP receives notice of such defects during the warranty period, HP will replace software media which does not execute its pr og ra m min g instr uc tion s du e to such defects.

3 HP does not warrant that the operation of HP products will be uninterrupted or

error free. If HP is unable, within a reasonable time, to repair or replace any product to a condition as warranted, you will be entitled to a refund of the purchase price upon prompt return of the product.

4 HP products may contain remanufactured parts equivalent to new in performance

or may have been subject to incidental use.

5 Warranty does not apply to defects resulting from (a) improper or inadequate

maintenance or calibration, (b) software, interfacing, parts, or supplies not supplied by HP, (c) unauthorized modification or misuse, (d) operation outside of the published environmental specifications for the product, or (d) improper site preparation or maintenance.

6 HP MAKES NO OTHER EXPRESS WARRANTY OR CONDITION WHETHER

WRITTEN OR ORAL. TO THE EXTENT ALLOWED BY LOCAL LAW, ANY IMPLIED WARRANTY OR CONDITION OR MERCHANTABILITY, SATISFACTORY QUALITY, OR FITNESS FOR A PARTICULAR PURPOSE IS LIMITED TO THE DURATION OF THE EXPRESS WARRANTY SET FORTH ABOVE. Some countries, states, or provinces do not allow limitations on the duration of an implied warranty, so the above limitation or exclusion might not apply to you. This warranty gives you specific legal rights and you might also have other rights that vary from country to country, state to state, or province to province.

Warranty statement 23

7 TO THE EXTENT ALLOWED BY LOCAL LAW, THE REMEDIES IN THIS

WARRANTY STATEMENT ARE YOUR SOLE AND EXCLUSIVE REMEDIES. EXCEPT AS INDICATED ABOVE, IN NO EVENT WILL HP OR ITS SUPPLIERS BE LIABLE FOR LOSS OF DATA OR FOR DIRECT, SPECIAL, INCIDENTAL, CONSEQUENTIAL (INCLUDING LOST PROFIT OR DATA), OR OTHER DAMAGE, WHETHER BASED IN CONTRACT, TORT, OR OTHERWISE. Some countries, states, or provinces do not allow the exclusion or limitation of inciden tal or consequential damages, so the above limitation or exclusion may not apply to you.

FOR CONSUMER TRANSACTIONS IN AUSTRALIA AND NEW ZEALAND, THE WARRANTY TERMS CONTAINED IN THIS STATEMENT, EXCEPT TO THE EXTENT LAWFULLY PERMITTED, DO NOT EXCLUDE, RESTRICT OR MODIFY AND ARE IN ADDITION TO THE MANDATORY STATUTORY RIGHTS APPLICABLE TO THE SALE OF THIS PRODUCT TO YOU.

Extended warranty

HP SupportPack provides coverage for the HP hardware product and all HP-supplied internal components. The hardware maintenance warranty covers a three-year period from the date of the HP product purchase. The customer must purchase the HP SupportPack within 90 days of the HP product purchase. The document number is 9036. Customers can contact the nearest HP-authorized dealer about this service.

24 Chapter 1 - Product information

Toner cartridge information

The toner cartridge is designed to simplify replacement of the major consumable parts. The toner cartridge contai ns the printing mechanism and a supply of toner.

At five percent page coverage, a toner cartridge will print approximately 2,500 pages. However, a toner cartridge should print more pages if it regularly prints pages with less coverage, such as short memos. The cartridge might print fewer pages if heavy or bold print is used.

For best results, always use a toner cartridge before the expiration date stamped on the toner cartridge box.

Refilled toner cartridges

While Hewlett-Packard does not prohibit the use of refilled toner cartridges during the warranty period or while the printer is under a maintenance contract, it is not recommended for the following reasons:

! Repairs resulting from the use of refilled toner cartridges are not

covered under Hewlett-Packard warranty or maintenance contracts.

! Hewlett-Packard has no control or process to ensure that a

refilled toner cartridge functions at the high level of reliability of a new HP LaserJet toner cartridge. Hewlett-Packard also cannot predict the long term reliability effect on the printer from using different toner formulations found in refilled cartridges.

! The print quality of HP LaserJet toner cartridges in fluences the

customer’s perception of the printer. Hewlett-Packard has no control over the actual print quality of a refilled toner cartridge.

Recycling toner cartridges

In order to reduce waste, Hewlett-Packard offers a recycling program. Cartridge components that do not wear out are r ecycled. Plastics and other materials are recycled. Hewlet t-Packard pays the shipping costs from the user to the recycling plant (within the United States). To join this recycling effort, follow the instructions inside the toner cartridge box.

Toner cartridge information 25

26 Chapter 1 - Product information

Installation and

operation

Chapter contents

Operating environment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Identifying printer components . . . . . . . . . . . . . . . . . . . . . . . . 29

Printer control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Control panel light patterns. . . . . . . . . . . . . . . . . . . . . .30

Copier/scanner control panel . . . . . . . . . . . . . . . . . . . .32

Selecting media . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Selecting media to print . . . . . . . . . . . . . . . . . . . . . . . .33

Selecting media to copy or scan. . . . . . . . . . . . . . . . . .34

Loading media . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35

Loading media to print . . . . . . . . . . . . . . . . . . . . . . . . .35

Loading media to copy or scan. . . . . . . . . . . . . . . . . . .36

Printer output paths . . . . . . . . . . . . . . . . . . . . . . . . . . .37

Chapter contents 27

Operating environment

Place the printer on a sturdy, level surface in a well-ventilated area that meets the following environmental requirements:

temperature: 10° to 32.5° C (50° to 90.5° F)

humidity: 20% to 80% relative humidity (no condensation)

! away from direct sunlight, open flames, and ammonia fumes ! sufficient space around the printer to allow fo r prop er acce ss and

ventilation

643 mm (25.3 inches)

253 mm (10.0 inches)

Figure 5. Dimensions of printer

416 mm (16.4 inches)

643 mm (25.3 inches)

Figure 6. Dimensions of printer with optional copier/scanner

28 Chapter 2 - Installation and operation

Identifying printer components

Printer control panel

The printer control panel has two lights a nd one lighted b utton. These lights produce patterns that identify the printer status.

Figure 7. Printer control panel

button and light—Prints self-test pages. (To print a self-test

page or to continue printing while in manual feed mode, press

button.)

and release the G

Ready light—Indicates that the printer is ready to print.

Attention light—Indicates that the main input tray is empty, toner cartridge door is open, toner cartridge is missing, or other errors.

Ready light (green)

Go button and

light (green)

Attention light (amber)

Identifying printer components 29

Control panel light patterns

Light off Light on

Light blinking

Figure 8. Light status legend

Table 9. Control panel light messages

Light status

Condition of the printer Action

Ready

The printer is ready to print.

Processing

The printer is receiving or processing data.

Manual feed or out of memory

The printer is in manual feed mode or out of memory. You can continue printing.

No action is necessary. To print a self-test page, press and release the the printer control panel.

Wait for the job to print.

Make sure that you have loaded the correct media. To continue printing, press and release the

The software controls manual feed. If you do not want the printer to be in manual feed mode, change the setting from the printer properties. See the printer software for more information.

The page being printed might be too complex for the printer memory capacity.

! To continue printing, press and release

the G

! Reduce the resolution. See the user

guide for more information.

! Add more memory. See the user guide

for more information.

GO button.

button.

button on

30 Chapter 2 - Installation and operation

Table 9. Control panel light messages (continued)

Light status

Condition of the printer Action

Door open, media out, no toner cartridge, or paper jam

The printer is in an error state that requires operator intervention or help.

Printer initialization/Cancel Job/Cleaning Mode

A printer initialization is taking place. If all lights blink for half of a second or longer in a sequence: the printer is initializing all previously sent print jobs are being purged a cleaning page is being printed

Fatal error

All lights are on.

! Make sure that the toner cartridge door

is completely closed.

! Make sure that the media is loaded

correctly. See the user guide for instructions.

! Make sure that the toner cartridge is

correctly installed in the printer. See the user guide for instructions.

! If the printer still has an error, there is a

paper jam. See the user guide for instructions.

No action is necessary.

! Turn the printer off and then back on. ! Unplug the printer for five minutes, and

then plug it back in.

! If the printer still has an error, see

chapter 6, “Troubleshooting.”

Accessory error

All lights are blinking.

! Remove the DIMMs and reseat. See

the user guide for instructions.

! If the printer still has an error, replace

the DIMMs.

Identifying printer components 31

Copier/scanner control panel

The control panel on the optional copier/scanner has two buttons,

and S

OPY

Figure 9. Copier/scanner control panel

Copy—To perform Quick Copies, even if your computer is turned off, press the C

Scan—To launch HP LaserJet Director, press the S HP LaserJet Director is configured correctly, you can perfor m the following tasks:

• Scan documents to e-mail

• Store documents electronically

• Edit text with Optical Character Recognition (OCR)

• Make multiple, customized, and color copies

CAN

button.

OPY

button and

OPY

light (clear)

button and

CAN

S light (clear)

button. If

CAN

Note To cancel a scan or copy job from the control panel, simultaneously

press both buttons.

32 Chapter 2 - Installation and operation

Selecting media

Selecting media to print

You can use paper with up to 100 percent recycled fiber content if it meets specifications. To order HP paper or the Print Media Guide for the HP LaserJet printer family, see the user guide.

Highly textured stock might not print evenly. Very glossy paper might jam or repel toner. Multipart forms can wrinkle or get jammed in the printer. And paper in poor condition, such as paper with tears, wrinkles, or bent edges, can jam.

Avoid envelopes that have a very slick finish, ones that have self-stick adhesives, or those with clasps or windows. Also avoid envelopes with thick, irregular, or curled edges, or areas that are wrinkled, torn, or otherwise damaged.

Use a sturdy envelope of approximately 60 to 90 g/ m weight. Use tightly constructed envelopes, and make sure that the folds are sharply creased.

The main input tray can hold up to 250 sheets of 75 g/m media. The priority input tray can hold up t o 10 sheets, one envelop e, or one piece of heavy media. Both can be adjusted to hold media measuring from 76.2 by 127 mm (3 by 5 inches) to 216 by 356 mm (8.5 by 14 inches). This includes, but is not limited to, the following paper and envelope sizes:

(16 to 24 lb)

(20 lb) print

Table 10. Media types

Paper type Metric English

Letter 216 by 279 mm 8.5 by 11 in Legal 216 by 356 mm 8.5 by 14 inches Executive 184 by 267 mm 7.25 by 10.5 inches A4 210 by 297 mm 8.25 by 11.75 inches COM10 Envelopes 105 by 241 mm 4.13 by 9.5 inches DL Envelopes 110 by 220 mm 4.33 by 8.67 inches C5 Envelopes 162 by 229 mm 6.4 by 9 inches B5 Envelopes 176 by 250 mm 6.9 by 9.85 inches Monarch Envelopes 98.5 by 191 mm 3.88 by 7.5 inches Custom size media custom custom

Note Narrow and heavy media can cause the printer to print slower.

Selecting media 33

Selecting media to copy or scan

The copier/scanner for the printer can handle a broader range of media sizes and types than the printer itself can. The following are the supported media sizes:

Minimum: 45 by 89 mm (1.7 by 3.5 inches)

Maximum: 216 by 356 mm (8.5 by 14 inches)

In addition, you can scan and copy many differen t types of media t hat are typically not used for printing, such as newsprint, photographs, business receipts, and business cards.

Note You must use a carrier sheet to feed small or delicate originals, such

as newsprint, through the copier/scanner without causing a jam. To make a carrier sheet, use a piece of paper and a transparency, tape the leading edges together, and load yo ur original between the sheets.

Note You must feed business cards and any media that is smaller than

76.2 by 27 mm (3 by 5 inches) through the straight-through output path. You can also tape them to the leading edg e of a carrier sheet and feed them to the straight-through out put bin.

Perform the following actions to minimize the possibility of jams:

! Remove self-stick notes.

Remove staples and paper clips.

! Straighten any curls or wrinkles in documents before put ting them

into the document feeder tray.

! Do not insert any document with glue, correction fluid, or wet ink

on it. Do not insert gum-backed paper or labels.

! Place documents with tears, perforations, or punch holes in a

carrier sheet, which you can buy or make. (See the user guide.)

! Avoid multiple-copy forms.

Do not scan originals that are larger or smaller than supported

size limitations. See th e user guide for more information.

Note To obtain good results, it is important that you use t he correct resolution

and color settings for your job. See the user gu ide for more information.

34 Chapter 2 - Installation and operation

Loading media

Loading media to print

Main input tray

The main input tray holds up to 250 sheets of 75 g/m2 (20 lb) paper or a 25 mm (0.98 inches) stack of heavier media. Load media with the top forward and the side to be printed facing up. To prevent jams and skew, always adjust the side media guides.

Priority input tray

The priority input tray holds up to ten pages of 75 g/m2 (20 lb) paper or one envelope, transparency, or card. Load media with the top forward and the side to be printed facing up. To prevent jams and skew, always adjust the side media guides.

CAUTION If you try to print o n media t hat is wr inkled, fo lded, or damag ed in a ny

way, a jam might occur. See the user guide for more information.

Note When you add new media, make sure that you remove all of the media

from the input tray and straighten the stack of new me d ia. This he lp s prevent multiple sheets of media from feeding through the printer at one time, reducing paper jams.

Specific types of media

Transparencies and labels: Load transparencies and labels with the top forward and the side to be printed fa cing u p. See th e user guide for more information.

Envelopes: Load envelopes with the nar row, stamp side for ward and the side to be printed facing up. See the user guide for more information.

Letterhead or preprinted forms: Load with the top forward and the side to be printed facing up. See the user guide for more information.

Cards and custom-sized media: Load with the narrow side forward and the side to be printed facing up. See the user guide for more information.

Loading media 35

Loading media to copy or scan

To load originals in the optional copier/scanner: 1 Load the original with the side to be scanned facing up.

If you scan a business card: a Loa d it wit h th e lon g side (ca llo ut 1) facin g forward and the

text facing up.

b Use the straight-through output path. See the user guide for

more information.

2 Adjust the media guides.

CAN

3 Press S

Note When you add new originals, always remove the originals from the

input tray and straighten the stack.

CAUTION Small originals will cause a jam if they are not loaded correctly.

Figure 10. Scanning a business card Note If you are editing te xt (OCR), make sure that the top edge of the original

is the leading edge, and make sure that t he text is facing up. For more information, see the user guide.

to scan or press C

for a copy.

OPY

36 Chapter 2 - Installation and operation

Printer output paths

Output bin

The output bin is located on the top of the printer. Printed media is collected here in the correct sequence when the straight-through output door is closed. Use the output bin when printing normal and large, collated documents.

Figure 11. Output bin

Straight-through output path

Extend for long media.

The straight-through output path is useful when you are printing envelopes, transparencies, heavy media, or any media that tends to curl when printed. Printed media exits in reverse order when the straight-through output door is open.

Figure 12. Straight-through output door Note Printed media does not stack when you use t he straight-through output

path. The media drops to the surface below unless you remove each sheet as it exits the printer.

Loading media 37

38 Chapter 2 - Installation and operation

Maintenance

Chapter contents

Life expectancies of consumables . . . . . . . . . . . . . . . . . . . . . 40

User-replaceable parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

Replacing the printer pickup roller . . . . . . . . . . . . . . . .41

Replacing the printer separation pad . . . . . . . . . . . . . .43

Replacing the copier/scanner separation pad . . . . . . . 45

Cleaning the equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Cleaning the print path . . . . . . . . . . . . . . . . . . . . . . . . . 47

Cleaning the toner cartridge area. . . . . . . . . . . . . . . . .48

Cleaning the printer pickup roller . . . . . . . . . . . . . . . . .49

Cleaning the printer separation pad . . . . . . . . . . . . . . . 50

Cleaning and recalibrating the copier/scanner . . . . . . . 51

Cleaning the scanner path . . . . . . . . . . . . . . . . . . . . . .51

Chapter contents 39

Life expectancies of consumables

Inspect consumables when servicing the printer. Replace consumables as needed, based on failure or wear, rather t han on usage.

The following table lists approximate schedules for replacing consumables.

Table 11. Life expectancies of consumables

Description Part number Estimated life

(pages)

Toner cartridge (user replaceable)

Printer transfer roller RG9-1483-000CN 25,000 Can affect print quality and/or

Printer pickup roller RF0-1008-000CN 25,000 Look for glazing and/or cracks. Printer separation pad RF0-1014-000CN 25,000 Can affect paper movement. Printer subpads RA0-1065-000CN 25,000 Can affect paper movement. Fuser assembly

(100-127 V) Fuser assembly

(220-240 V) Copier/scanner separation

pad kit Copier/scanner R37-5020-000CN 10,000 Can affect document movement. * The estimated toner cartridge life is based on letter- or A4-sized paper with an average of five percent

toner coverage and a medium density setting. Toner cartridge life can be extended further by conserving toner using draft mode settings.

C7115A 2,500 When print becomes faint, C7115X 3,500

RG9-1493-000CN 25,000 Can affect print quality and paper

RG9-1494-000CN 25,000 Can affect print quality and paper

RY7-5055-000CN 10,000 Can affect document movement.

Remarks

redistribute toner in the cartridge by gently shaking the cartridge from side to side.

paper movement.

movement.

User-replaceable parts

Replace the copier/scanner separation pad, th e printer pickup roller, and the printer separation pad when the parts are near the end of their life expectancies or if media frequently misf eeds.

40 Chapter 3 - Maintenance

Replacing the printer pickup roller

If the printer regularly misfeeds (no media feeds through), you might have to replace or clean the pickup roller.

CAUTION

Failure to complete this procedure might damage the printer.

1 Unplug the power cord from the

printer, and allow the printer to cool.

2 Open the toner cartridge door, and

remove the toner cartridge.

3 Locate the pickup roller. 4 Release the small, white tabs on

each side of the pickup roller by pushing them away from the roller, and then rotate the pickup roller toward the front.

5 Gently pull the pickup roller up and

out.

User-replaceable parts 41

6 Position the new pickup roller in the

slot of the previous pickup roller.

Note

Circular and rectangular pegs on each side prevent you from incorrectly positioning the pickup roller.

7 Rotate the top of the new pickup

roller into position until the white tabs on each side of the roller snap the roller into place.

8 Reinstall the toner cartridge, and

close the toner cartridge door.

9 Plug the printer in to turn it back on.

42 Chapter 3 - Maintenance

Replacing the printer separation pad

Note

Before you change the separation pad, clean the pickup roller. See “Cleaning

the printer pickup roller” on page 49 for instructions.

If the input tray feeds more than one page at a time, you might have to replace the printer separation pad. Recurring feed problems indicate that the printer separation pad is worn.

1 Unplug the power cord from the

printer, and allow the printer to cool.

2 Remove the input trays. 3 Locate the blue separation pad. 4 To pry the separation pad up from

the spring-loaded base, insert a flatedged screwdriver in the slot under the separation pad and twist until the tabs are free.

5 Reach in throug h th e inp ut tray

opening, push the spring-loaded base down with one hand, and pull the separation pad up with the other hand.

User-replaceable parts 43

6 With one hand, re ac h th ro ugh the

input tray opening, and push the spring-loaded base down. With the other hand, position the new separation pad in the slot of the previous separation pad.

Note

The tab on the right is larger to help you position the separation pad correctly.

7 Snap both sides of the separation

pad firmly into place.

CAUTION

Make sure that the separation pad is

straight and that there is no space between the separation pad and the spring-loaded base. If the separation pad is not straight or you see space on one side, remove the separation pad, make sure that the larger tab is on the right, reinsert the separation pad, and snap both sides into place.

44 Chapter 3 - Maintenance

8 Reinstall the input trays, and then

plug the printer in to turn it back on.

Replacing the copier/ scanner separation pad

If the optional copier/scanner feeds more than one page at a time, you might have to replace the copier/scanner separation pad. Recurring feed problems indicate

that the pad is worn. 1 Unplug the printer to turn the power

off, and wait for the copier/scanner to cool.

2 Press the copier/scanner door

release button and open the copier/ scanner door.

3 Locate the copier/scanner

separation pad and lift it straight up.

4 Press the new pad into place. 5 Close the copier/scanner door.

User-replaceable parts 45

Cleaning the equipment

WARNING! Before you perform these steps, unplug the printer to avoid shock

hazard. To maintain quality, thoroughly clean the printer:

! Any time a new toner cartridge is installed. ! After printing approximately 2,500 pag es.

Whenever print quality problems appear.

Clean the outside of the printer with a water-da mpened cloth. Clean the inside with only a dry, lint-free cloth (such as a lens tissue).

To avoid permanent damage to the toner cart ridge, do not use ammonia-based cleaners on or around the printer.

WARNING! Avoid touching the heating element in the fuser. It might be very hot

and can cause burns.

CAUTION Do not touch the surface of the black sponge transfer roller.

Contaminants on the roller can cause print quality problems.

46 Chapter 3 - Maintenance

Cleaning the print path

Use this process if you discover toner specks or dots on printouts. This process produces a transparency with toner debris, which should be discarded.

Note This process requires a transparency to remove dust and toner from

the print paper path. Do not use bond or rough paper. Make sure the transparency you use meets media requirements for the

printer. If transparency film is una v ailab le , y ou ca n use paper. If y ou must u se

paper, perform the procedure two or three times to ensure proper cleaning.

1 Load a transparency in the priority input tray. 2 Make sure that the printer is in the Ready state.

button for 10 seconds. The transparency

3 Press and hold the G

feeds through the printer slowly. Discard the transparency.

Note After you press and hold the G

until the cleaning process is complete.

button, the three printer lights blink

Cleaning the equipment 47

Cleaning the toner cartridge area

Cleaning the toner cartridge area can improve the quality of your printed sheets.

WARNING!

Before cleaning the printer, disconnect it from the power source and wait for the printer to cool.

1 Open the toner cartridge door, and

remove the toner cartridge.

CAUTION

To prevent damage, do not expose the toner cartridge to light. Cover the toner cartridge if necessary. Also, do not touch the black sponge transfer roller inside the printer. Touching it can reduce the print quality of output.

2 Wipe the media path area and the

toner cartridge cavity with a dry, lintfree cloth.

Note

Use only a dry, lint-free cloth to remove dust and toner. Using a vacuum or other device to clean inside the product can damage it.

48 Chapter 3 - Maintenance

3 Replace the toner cartridge, and

close the toner cartridge door.

4 Plug the power cord back into the

printer.

Cleaning the printer pickup roller

If you want to clean the pickup roller rather than replace it, follow the instructions below:

Remove the pickup roller as described in

steps 1 through 5 of “Replacing the printer pickup roller” on page 41.

1 Dampen a lint-free cloth in isopropyl

alcohol, and scrub the roller.

WARNING!

Alcohol is flammable. Keep the alcohol and cloth away from an open flame. Before you close the printer and plug in the power cord, allow the alcohol to dry completely.

2 Using a dry, lint-free cloth, wipe the

pickup roller to remove loosened dirt.

3 Allow the pickup roller to dry

completely before you reinstall it in the printer. To reinstall the pickup roller, see steps 6 through 9 of "Replacing the printer pickup roller" on page 42.

Cleaning the equipment 49

Cleaning the printer separation pad

If you want to clean the separation pad rather than replacing it, follow the instructions below:

1 Remove the separation pad as

described in steps 1 through 5 of “Replacing the printer separation pad” on page 43.

2 Dab a lint-free cloth in isopropyl

alcohol, and scrub the pad.

WARNING!

Alcohol is flammable. Keep the alcohol and cloth away from an open flame. Before you close the printer and plug in the power cord, allow the alcohol to dry completely.

3 Using a dry, lint-free cloth, wipe the

pad to remove loosened dirt.

50 Chapter 3 - Maintenance

4 Allow the pad to dry completely

before you reinstall it in the printer. To reinstall the pad, see steps 6 through 8 of “Replacing the printer separation pad” on page 43.

Cleaning and recalibrating the copier/scanner

Recalibrating the copier/scanner

The optional copier/scanner automatically calibrates to the white sheet opposite the image sensor at the beginning of each scan or copy job.

Keep the white sheet clean to make sure the optional copier/scanner calibrates correctly. See “Cleaning the scanner path” on page 51 for information about cleaning the white sheet.

Cleaning the scanner path

You might have to clean the copier/ scanner if:

! You can smudge the ink on

documents you scan.

! The documents have excessive

amounts of dust or dirt on them.

! There are smudges or other marks

on documents or scans of documents.

! The scanned output has lines or

defects that were not on the original.

Note

Be careful not to touch the glass surface of the image sensor. If you inadvertently touch the glass, clean it according to th e instructions below.

1 Unplug the printer to turn the power

off, and wait for the copier/scanner to cool.

2 Open the scanner door.

Cleaning the equipment 51

3 Dampen a clean cotton cloth with

isopropyl alcohol (pH7 or neutral pH). With the damp cloth, gently rub back and forth on the white sheet. Also, use the damp cloth to gently rub the rollers.

WARNING!

Alcohol is flammable. Keep the alcohol and cloth away from an open flame. Allow the alcohol to dry completely before you plug in the power cord.

4 Spray glass cleaner on another

piece of clean cotton cloth, and carefully clean the glass on the

image sensor.

WARNING!

Make sure that the scanner is completely dry before you plug in the printer power cord.

52 Chapter 3 - Maintenance

5 Plug the printer in to turn it back on.

Operational overview

Chapter contents

Basic functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

Formatter system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Control panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

Draft mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

MEt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

Enhanced I/O . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

PJL overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

Printer functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

Engine control unit/power system. . . . . . . . . . . . . . . . .59

Image formation system . . . . . . . . . . . . . . . . . . . . . . . .64

Printer paper-feed system . . . . . . . . . . . . . . . . . . . . . .67

Jam detection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69

Optional copier/scanner . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Optical system . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

Document pickup and feed systems. . . . . . . . . . . . . . .71

Basic sequence of operation (formatter-to -printer). . . .73

Chapter contents 53

Basic functions

This chapter presents a functional ove rvie w of th e pr int er’s processes. The following systems are discussed:

formatter

! printer functions

• engine control unit (ECU) system/power system

• image formation system

• paper-feed system (printer) and

! optical system (optional copier/scanner)

The printer has an optional copier/scanner. Operat ion sequences of the printer are controlled by the ECU. Operation sequ en ce s of the optional copier/scanner are controlled by the formatter.

Figure 13. Basic configuration

54 Chapter 4 - Operational overview

Formatter system

The formatter is responsible for the following:

controlling the optional copier/scanner

! formatting and controlling copies ! receiving and processing print data from the printer interface ! monitoring the control panel and relaying printer status

information

! developing and coordinating data placement and timing with the

print engine

! communicating with the host computer through the bidirectional

interface

The formatter receives print data from the bidirectional Extended Capabilities Port (ECP) mode interface or Universal Serial Bus (USB) interface and converts it into a dot image . The ECU synch ronizes t he image formation system with the paper-feed system and signals the formatter to send the print image data. The formatter sends the print image data (dots) in the form of a video signal, and the pr inting process begins.

Central processing unit

The formatter incorporates an embedde d Coldfire V3 microprocessor operating at 90 MHz.

RAM

! One bank of Non-Volatile RAM (NVRAM) stores parameter s. ! Dynamic random access memory (DRAM) provides temporary

storage of copy, scan, and print data.

Parallel interface or Universal Serial Bus interface

The formatter receives incoming data through it s bidirectional ECP or USB interface. This interface provides high-speed, two-way communication between the printer and the host, allowing you to change printer settings and monitor printer status from the host computer.

Formatter system 55

Control panel

three front panel status lights (one contained in the GO button)

! G

button

Draft mode

Depending on which printer driver is used, selecting draft or EconoMode from the printer driver allows the printer to use approximately fifty percent less toner, extending the life of t he toner cartridge.

MEt

HP MEt effectively doubles the standard memor y thro ugh a variety of font and data-compression methods.

Enhanced I/O

The Enhanced I/O feature allows printer memory to be used for storing data received from the host computer. When Enhanced I / O is enabled, you can send more data to the print e r in shor te r amo unt s of time, which allows you to return to your application sooner. Enhanced I/O has the following options:

Auto—allows the printer to use Enhanced I/O memory allocation to increase the speed of data transfer from the host comput er to the printer, if necessary. The default setting is Auto.

Off—uses the minimum amount of printer memory for storing data sent from the host computer.

Page Protect—allows the formatter to create the entire page image in page buffer memory before physically moving the media through the printer. This process ensures that the entire page will be printed. The default setting is Auto.

Page complexity (ruling lines, complex graphics, or dense te xt) can exceed the printer’s ability to create the page image fast enough to keep pace with the image formation process. If Page Protect is disabled and a page is too complex, the page might print in parts (for example, the top half on one page and the bottom half on the next page). Some print-data loss is likely in these instances, and the printer will display an error message.

56 Chapter 4 - Operational overview

PJL overview

Printer Job Language (PJL) is an integral part of configuration, in addition to the standard Printer Command Language (PCL). With standard ECP cabling, PJL allows the printer to perform functions such as:

Two-way communication with the host computer through a bidirectional parallel or USB connection. The printer can tell the host such things as the control panel status.

Isolation of print envir onment settings from one print job to the next. For example, if a print job is sent to t he print er in lan dsca pe mode, the subsequent print jobs print in landscape only if they are formatted for landscape printing.

Formatter system 57

Printer functions

Printer functions are divided into five groups:

engine control

! formatter ! image formation ! laser/scanner ! pickup and feed

The following figure is a block diagram of the printer unit:

Figure 14. Printer unit functional block diagra m

58 Chapter 4 - Operational overview

Engine control unit/power system

The engine control unit (ECU) coordinates all print engine activities, drives the laser, and coordinates print data from the f ormatter with the image formation process. The ECU also includes power supply and distribution circuitry.

Note In several other HP LaserJet products, the ECU is also known as the

controller PCA or the DC controller PCA. The ECU controls the following systems and functions:

Printer engine control

• paper motion monitoring and control (printing)

• motor

Printer laser/scanner

Power system

• AC power distribution

• DC power distribution

• overcurrent/overvoltage protection

• high-voltage power distribution

Printer functions 59

The following figure shows the various ECU loads:

Figure 15. ECU loads

60 Chapter 4 - Operational overview

Printer engine control system

Paper motion monitoring and control

The ECU controls paper motion in the printer by continuously monitoring the various paper sensors and coordina ting the timing with the other print processes.

For a detailed explanation of paper movement and the interaction of the photosensors and solenoid with the paper movement pr ocess, see “Printer paper-feed system” on page 67.

Motor

The motor is controlled by the ECU. The motor provides all of the printer paper movement.

Printer laser/scanner drive

The ECU sends signals to the laser/scanner assembly to modulate the laser diode “on” and “off” and to drive the laser/scanner motor.

Figure 16. Overview of laser/scanner operation

Printer functions 61

Power system on ECU

The AC, DC, and high-voltage power su pply circuit s ar e all contai ned within the ECU.

AC power distribution

The AC power circuitry supplies AC voltage whenever the power cord is connected to the AC power source. AC voltage is distri buted t o the DC power supply circuitry and to the AC driver circuitry, which controls AC voltage to the fuser assembly heating element.

DC power distribution

The DC power distribution circuitry, located on the ECU, distributes +3.3 Vdc, +5 Vdc, and +24 Vdc as follows:

! +3.3 Vdc: Formatter

Laser/beam detect circuitry ECU Photosensors

! +5 Vdc: Formatter

ECU Laser/beam detect circuitry

! +24 Vdc: Motor

Exhaust fan Laser/scanner motor Document scanner motor Solenoid Formatter (routing only) High voltage power supply Fuser safety circuit

Overcurrent/overvoltage

There are two overvoltage devices in this printer:

! Fuse F101 provides overcurrent protection for the fusing system

circuitry. Checking or replacing the fuse requires the removal of the ECU. Fuse F102 provides overcurrent protection to the printer DC power supply circuitry.

! In addition, the +24 Vdc and +3.3 Vdc power circuitr y contains an

overcurrent protection circuit th at au to m atically shuts off the output voltage when an overcurrent condition occurs as a result of a short or an abnormal voltage on the load side.

62 Chapter 4 - Operational overview

High-voltage power distribution

The high-voltage power supply applies an overlap of DC and AC voltage to the primary charging roller and the developing roller. This circuit also applies a positive or negative DC voltage to the transfer roller according to the instructions from the engine control unit.

This circuit also controls the image density by changing the primary AC voltage and the developing AC bias acco rding to the pr int d ensit y setting.

High voltage is disabled when the printer door is open.

Figure 17. High-voltage power supply circuit

Printer functions 63

Image formation system

Laser printing requires the interaction of several different technologies including electronics, optics, and electrophotographics to provide a printed page. Each process functions inde penden tly an d must be coordinated with the other printer processes. Image formation consists of seven processes:

Figure 18. Image formation block diagram

Toner cartridge

As the focal point of the image formation system, the toner cartridge houses the cleaning, conditioning, and developing stages of the process. The toner cartridge contains the photosensitive drum primary charging roller, developing station, toner cavity, and cleaning station. By including these components (which wear, degrade, or are consumed) in the replaceable toner cartridge, the need for many service calls is eliminated. The special photos en sitiv e pr op e rtie s of the drum form an image on the drum surface and then transfer the image to media.

CAUTION The printer toner car tridge does not include a light-blocking shutt er. Do

not expose the drum to light, which can permanently da mage the drum. Protect the toner cartridge whenever removing it from the printer.

64 Chapter 4 - Operational overview

Breakdown of the seven image formation processes

1 Conditioning stage (primary charging)—This process applies

a uniform negative charge to the surface of the drum with the primary charging roller, which is located in the toner car tridge. The primary charging roller is coated with conductive rubber. An AC bias is applied to the roller to erase any residual char ges from any previous image. In addition, the primary charging rolle r applies a negative DC bias to create a uniform negative pot en tial on the drum surface. The print density setting modifies the DC voltage.

2 Writing stage (scanning exposure)—During this process, a

modulated laser diode projects the beam onto a rotat ing scanning mirror. As the mirror rotates, the beam reflects off the mirror, first through a set of focusing lenses, then off a mirror, and fina lly through a slot in the top of the toner cartridge, and onto the photosensitive drum. The beam sweeps the drum from left to right, discharging the negative potential wherever the beam strikes the surface. This creates a latent electrostatic image, which later is developed into a visible image.

Because the beam sweeps the entire length of the drum while the drum rotates, the entire surface area of the drum can be covered. At the end of each sweep, the beam strikes the beam detect lens, generating the beam detect signal (BD signal). The BD signal is sent to the ECU where it is converted to an electrical signal used to synchronize the output of the next scan line of data.

3 Developing stage—During this process, the latent electrosta tic

image is present on the drum. The toner particles obtain a negative surface charge by rubbing against the developing cylinder, which is connected to a negative DC supply. The negatively charged toner is attracted t o the di scharged ( exposed, grounded) areas of the drum, and it is repelled from the negatively charged (unexposed) areas.

4 Transfer stage—During this process, the toner image on the

drum surface is transferred to the media. The transfer roller applies a positive charge to the back of the media, which attracts the negatively charged toner on the drum surface to the media. After separation, the drum is cleaned and con ditioned for the next image.

Printer functions 65

5 Separation stage—During this process, the media separates

from the drum. To stabilize the feed system and prevent toner dropouts on the printed image at low temperature and humidity, the static eliminator reduces the charge on the back of the media.

6 Fusing stage—During this process, the heat and pressure fuse

the toner into the media to produce a permanent image. The media passes between a heated fusing element and a soft pressure roller, which melt the toner and press it into the media.

7 Drum cleaning stage—During this process, the cleaning blade

is in contact with the surface of the drum at all times. As the drum rotates during printing, it wipes excess toner off the drum and stores it in the waste toner receptacle.

66 Chapter 4 - Operational overview

Printer paper-feed system

Step 1 The main input tray and the priority input tray merge int o one,

main input area. Media placed in any of these areas enables the paper-out sensor (PS201), which informs the ECU that media is present. The following steps occur when the printer receives a print job:

Step 2 The ECU enables the laser/scanner assembly and the motor .

Paper motion begins when the ECU energizes the solenoid (SL001).

Step 3 The paper pickup roller rotates once. The paper lift plate

pushes the media against the pickup roller.

Step 4 The pickup roller grabs the top sheet and advances it to the

feed assembly drive rollers. To ensure that only one sheet is fed, a main separation pad and two subpads hold th e remainder of the stack in place.

Step 5 The feed assembly drive rollers advance the media to the

paper top sensor (PS402). This sensor informs the ECU of the exact location of the leading edge of media, so that the image being written on the photosensitive drum can be precisely positioned on the page.

Step 6 The feed assembly drive rollers then advance the media to

the transfer area where the toner image on the photosensitive drum is transferred to media.

Step 7 After the image is transferred, the media enters the fu ser

assembly where heat from the fuser and pressure from the pressure roller permanently bond the toner image to media. The paper delivery sensor (PS401) determines that media has successfully moved out of the fusing area.

Step 8 The fuser assembly exit rollers deliver media to either the

paper output bin or the straight-through output path, depending upon the position of the straight-through output path door.

Printer functions 67

Figure 19. Printer path

68 Chapter 4 - Operational overview

Jam detection

The paper-out sensor (PS201) detects the presence of media in either the priority input tray or the main input tray. The paper top sensor (PS402) and the paper delivery sensor (PS401) detect media moving through the printer. If a jam is detected, the ECU immediately stops the printing process and displays a jam message on the control panel.

A jam can be detected under any of the following conditions:

Pickup delay jam—Media does not reach the paper top sensor (PS402) after the pickup solenoid (SL001) has been turned on twice (the original pickup plus a retry) within 2.8 seconds.

Pickup stationary jam—The paper top sensor (PS402) does not detect the trailing edge of media within 4.6 seconds of detecting the leading edge.

Delivery-delay jam—The paper delivery sensor (PS401) does not detect the leading edge of media within 2.1 seconds af t er th e paper top sensor (PS402) detects the leading edge.

Wrapping jam—The paper delivery sensor (PS401) does not detect the trailing edge of the media within 1.5 seconds after the paper top sensor (PS402) detects th e leading edge and within ten seconds after the paper delivery sensor (PS401) detects th e leading edge.

Delivery-stationary jam—The paper delivery sensor (PS401) does not detect the leading edge of media within 2.2 seconds after the paper top sensor (PS402) detects the trailing edge.

Residual paper jam—The paper top sensor (PS402) or the paper delivery sensor (PS401) detect media in the initial rotation period.

Printer functions 69

Solenoid, photosensors, and switches

The following figure shows the locations of the solenoid, photosensors, and switches.

Figure 20. Solenoid, photosensors, and switches

1 Paper delivery sensor (PS401) senses when paper has

successfully moved out of the fusing area.

2 Power switch.

Note Products sold in North America do not have power switches.

3 Paper top sensor (PS402) detects the leading and trailing edges

of the paper. It synchronizes the photos en stive drum and the top of the paper.

4 Engine test switch (SW201); see “Engine test” on page 149 for an

explanation of the switch.

5 Door-open switch (SW301) detects whether or not the printer

door is closed and the toner cartridge is present. Printing cannot continue until the printer door is closed and the toner cartridge is in its correct position.

6 Solenoid (SL001) enables the pickup roller. 7 Paper-out sensor (PS201) senses when paper is in the main

input tray or the priority input tray.

70 Chapter 4 - Operational overview

Optional copier/scanner

The optional copier/scanner consists of the optica l system and the document pickup and feed systems.

Optical system

The optical system, also known as the contact image sensor, contains the following:

! light-emitting diode (LED) array ! contact glass ! rod lens array ! sensor array

The light source has three LEDs and is controlled by the formatter. Light reflected from documents passes through the rod lens a rray and focuses on the sensor array.

The sensor array consists of 5,160 photo transistors: 1 5 driver circuits amplify the light reception output in units of 344 ph ototransisto rs. The image data is converted and sent from the driv er circu its to th e formatter.

Document pickup and feed systems

The document pickup and feed systems contain a pickup roller, feed roller, and delivery roller, all of which are driven b y the copier/scanner motor (M1).

The document top sensor (U20) detects the top and bottom edges of the document.

Optional copier/scanner 71

Copier/scanner path

The following figure shows the copier/scanner path.

Figure 21. Copier/scanner path

72 Chapter 4 - Operational overview

Basic sequence of operation (formatter-toprinter)

The operation sequence of the printer is controlled by the microprocessor (CPU) on the ECU. The following events take place during normal printer operation:

Table 12. Basic sequence of operation

Period Purpose Remarks

WAIT After the printer is turned on until the end of the initial rotation of the main motor.

STBY (Standby) From the end of the WAIT period or the LSTR period until the pickup command is input from the formatter. Or, from the end of the LSTR period until the printer is turned off.

INTR (Initial Rotation Period) After the pickup command has been input from the formatter until the media reaches the paper top sensor (PS402).

PRINT (Print) From the end of the initial rotation until the primary voltage goes OFF.

LSTR (Last Rotation Period) After the primary voltage goes OFF until the main motor stops rotating.

To clear the drum surface of potential and to clean the primary charging roller.

To keep the printer ready to print.

To stabilize the photosensitive drum sensitivity in preparation for printing. Also to clean the primary charging roller.

To form images on the photosensitive drum based on the VIDEO signals (/VDO, VDO) input from the formatter and to transfer the toner image onto the media.

To deliver the last page. Also to clean the primary charging roller.

Detects whether or not the cartridge is installed.

When the pickup command is input from the video controller, the printer enters the INTR period immediately after the end of the LSTR period.

Optional copier/scanner 73

Figure 22. General timing diagram

74 Chapter 4 - Operational overview

Removal and

replacement

Chapter contents

Removal and replacement strategy . . . . . . . . . . . . . . . . . . . .77

Required tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

Before performing service . . . . . . . . . . . . . . . . . . . . . . 78

Toner cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .78

Parts removal order . . . . . . . . . . . . . . . . . . . . . . . . . . .79

Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

Left side cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80

Optional copier/scanner . . . . . . . . . . . . . . . . . . . . . . . .81

Back cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .82

Right side cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .84

Top cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87

Control panel assembly . . . . . . . . . . . . . . . . . . . . . . . .88

Front cover assembly . . . . . . . . . . . . . . . . . . . . . . . . . .89

Internal assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

Transfer roller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96

Formatter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97

Laser/scanner assembly. . . . . . . . . . . . . . . . . . . . . . . .99

Fuser assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101

Output rollers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105

Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Solenoid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .108

Fan assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .110

Right plate assembly . . . . . . . . . . . . . . . . . . . . . . . . .112

Pickup assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . .114

Chapter contents 75

Pickup roller shaft . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Paper lift plate assembly . . . . . . . . . . . . . . . . . . . . . . 118

Left plate assembly . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Bottom assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

ECU pan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Paper-feed assembly. . . . . . . . . . . . . . . . . . . . . . . . . 124

76 Chapter 5 - Removal and replacement

Removal and replacement strategy

This chapter documents the removal and replacement of field replaceable units (FRUs) only.

Replacement is generally the reverse of removal. Occasionally, notes are included to provide directions for difficult or critical replacement procedures.

WARNING! Unplug the power cord from the power outlet before attempting

to service the printer. If this warning is not followed, severe injury can result. Certain functional checks during troubleshooting must be performed with power supplied to the printer. However, the power supply should be disconnected during removal.

Never operate or service the printer with the pro tective cover removed from the laser/scanner assembly. The reflected beam, although invisible, can damage your eyes.

The sheet metal edges of the printer can be sharp. Use caution when working on the printer.

CAUTION Some printer parts are electrostatic discharge (ESD) sensitive. Always

perform service work at an ESD-protected workstation. To install a self-tapping screw, first turn it counterclockwise to align it

with the existing thread pattern, then carefully turn it clockwise to tighten. Do not overtighten. If a self-tapping screw-hole becomes stripped, repair the screw-hole or replace the affected assembly.

Always remove the toner cartridge before removing or r eplacing parts. See “Toner cartridge” on page 78.

Required tools

! #2 Phillips-head screwdriver with magnetic tip

Small flatblade screwdriver

! Needle nose pliers ! ESD mat

Penlight

CAUTION A PoziDriv screwdriver will damage screw heads on the printer. Use a

#2 Phillips-head screwdriver.

Removal and replacement strategy 77

Before performing service

! Remove all media from the printer. ! Unplug the power cable.

Place the printer on an ESD mat.

! Remove the main input tray. ! If the optional copier/scanner is attached, remove the copier/

scanner media input tray and the copier/scanner output bin.

! Remove the toner cartridge (see page 78).

Toner cartridge

Note You will feel resistance when you open the toner cartridge door.

1 Open the toner cartridge door, which lifts the toner cartridge

toward you.

2 Remove the toner cartridge.

CAUTION To prevent damage, do not expose the toner cartridge to light. Cover

it with a piece of paper.

Figure 23. Removing the toner cartridge

78 Chapter 5 - Removal and replacement

Pickup roller Separation pad Transfer roller Left side cover

Optional copier/scanner Back cover

Formatter ECU Solenoid

Parts removal order

Use the following diagram to determine which parts must be remove d before removing other parts:

Right side cover

Top cover

Fan assembly Control panel

Front cover assembly

Right plate assembly

Pickup assembly

Pickup roller shaft

Paper lift plate

(ECU)

Paper-feed assembly

(Formatter)

Left plate assembly Laser/scanner Fuser assembly

Output rollers

assembly

Note

Motor

The ECU and the formatter are listed twice. The ECU must be removed to gain access to the paper-feed assembly.

To remove the ECU only, remove the right side cover. The formatter must be removed to gain access to the left plate assembly.

To remove the formatter only, remove the left side cover.

Removal and replacement strategy 79

Covers

Left side cover

1 Open the toner cartridge door. 2 Pull out on the notch (callout 1) on the back of the cover. 3 Rotate the cover away from the printer.

Figure 24. Removing the left side cover

80 Chapter 5 - Removal and replacement

Optional copier/scanner

CAUTION You must unplug the printer before removing or reinstalling the optional

copier/scanner, or you might damage bo th the printer and the op tional copier/scanner.

1 Remove the left side cover (see page 80). 2 Pull up on the ribbon cable to disconnect it from the connector

(callout 1) on the formatter.

Note The optional copier/scanner has two tabs that ho ok into the underside

of the printer output bin. Another tab and a pin stabilize the optional copier/scanner in the back. Use care so that you do not bend or break the three tabs or the pin.

3 Pull the optional copier/scanner forward (callout 2), and lift it up

(callout 3) to remove it.

Figure 25. Removing the optional copier/scanner

Covers 81

Back cover

1 Remove the left side cover (see page 80). 2 Open the straight-through output door. 3 Remove two screws (callout 1) from the back of the printer.

Figure 26. Removing the back cover (1 of 2)

82 Chapter 5 - Removal and replacement

4 Press down and hold the two release levers (callout 1) and pull

the cover off of the printer.

Note The back cover has two tabs (not shown), one on each side of the

printer. Step 4 releases these two tabs.

Figure 27. Removing the back cover (2 of 2)

Covers 83

Right side cover

1 Open the toner cartridge door. 2 Remove the back cover (see page 82). 3 Remove one screw (callout 1) on the back of the printer.

Figure 28. Removing the right side cover (1 of 3)

84 Chapter 5 - Removal and replacement

4 Lift the right side of the printer and release the tab (callout 1) on

the bottom of the cover.

Figure 29. Removing the right side cover (2 of 3)

Covers 85

5 While continuing to press the release tab, grasp the top of the

cover and rotate it away from the printer.

Figure 30. Removing the right side cover (3 of 3)

86 Chapter 5 - Removal and replacement

Top cover

1 If the printer has the optional copier/scanner attached, remove it

(see page 81).

2 Remove the left side, back, and right side covers (see pages 80

through 86), and open the toner cartridge door.

3 Loosen two screws (callout 1) on the back of the printer. 4 Remove two screws (callout 2) on the top of the printer. 5 Lift the cover off of the printer.

Figure 31. Removing the top cover

Covers 87

Control panel assembly

1 Remove the left side, back, right side, and top covers (see pages

80 through 87).

2 Disconnect the control panel cable (callout 1) from the formatter. 3 Remove two screws (callout 2 and callout 3) from the top of the

control panel assembly.

Note The first screw (callout 2) secures the control panel casing, and the

second screw (callout 3) secures the inte rnal bracke t. Be su re to h old the assembly together as you remove it.

Rotate the control panel assembly toward the fro n t of the printe r to release the tab (callout 4).

4 Remove the control panel assembly.

Figure 32. Removing the control panel

88 Chapter 5 - Removal and replacement

Front cover assembly

The front cover assembly is composed of three pieces:

front cover (the frame that surrounds the main input tray)

! toner cartridge door ! front guide assembly (the internal shelf that attaches the front

cover and the toner cartridge door to the printer)

Front cover

1 Remove the left side, back, right side, and top covers (see pages

80 through 87).

2 Close the toner cartridge door. 3 Loosen two screws (one shown, callout 1), one on each side of

the cover.

Figure 33. Removing the front cover (1 of 2)

Covers 89

4 Pull the top of the front cover away from the printer to release the

three tabs (callout 1).

5 Lift the front of the printer to release the tab s on th e bottom of the

front cover.

6 Remove the front cover.

Figure 34. Removing the front cover (2 of 2)

90 Chapter 5 - Removal and replacement

Toner cartridge door

1 Remove the left side, back, right side, and top covers (see pages

80 through 87).

2 Remove the control panel assembly (see page 88). 3 Remove the front cover (see page 89). 4 Open the toner cartridge door. 5 Remove one screw (callout 1) from the bracket on the right side

of the printer, and remove the bracket.

6 At the right side, press the two small tabs (callout 2) on the inside

of the connecting link to release it.

7 Repeat on the left side.

Note After the toner cartridge d oor is remove d, it is easy to remove the t wo

connecting links.

Figure 35. Removing the toner cartridge door (1 of 2)

Covers 91

8 Unhook the toner cartridge door hinge on the right side, an d slide

the toner cartridge door toward the left to remove it.

Figure 36. Removing the toner cartridge door (2 of 2)

To reinstall

Lift the toner cartridge door hinge above the stop (callout 1). Otherwise, the toner cartridge door will not close.

92 Chapter 5 - Removal and replacement

Front guide assembly

1 From the front of the printer, remove two screws (callout 1).

Figure 37. Removing the front guide assembly (1 of 3)

Covers 93

2 On the right side, release the lower tab (callout 1) and the upper

tab (callout 2).

Figure 38. Removing the front guide assembly (2 of 3)

94 Chapter 5 - Removal and replacement

3 On the left side, release the upper tab (callout 1) and the lower

tab (callout 2).

4 Remove the front guide assembly.

Figure 39. Removing the front guide assembly (3 of 3)

Covers 95

Internal assemblies

Transfer roller

1 Open the toner cartridge door and remove the toner cartridge

(see page 78).

2 Use needle nose pliers to gently squeeze the two small tabs on

the transfer roller.

3 Lift the transfer roller up, slide it to the right, and lift it out of the

printer.

Figure 40. Removing the transfer roller Note Do not misplace the small grounding spring that is u nderneath the right

side of the transfer roller.

CAUTION Do not touch the black sponge portion of the transfer roller.

96 Chapter 5 - Removal and replacement

Formatter

1 Remove the left side cover (see page 80). 2 If the optional copier/scanner assembly is attached to the printer,

disconnect the copier/scanner cable (callout 1) from the formatter.

3 Disconnect the two flat flexible cables (callout 2) from the zero

insertion force (ZIF) connectors on the formatter.

4 Unplug the laser/scanner cable (callout 3) and the control panel

cable (callout 4) from the formatter.

Figure 41. Removing the formatter (1 of 2)

Internal assemblies 97

5 Remove five screws (callout 1). 6 Rotate the formatter up and off of the hooks on the chassis and

remove it from the printer.

7 Disconnect and remove the formatter shield.

Figure 42. Removing the formatter (2 of 2)

To reinstall

When you reconnect the cable, make sure you lock the ZIF connectors back into place.

98 Chapter 5 - Removal and replacement

Hp LASERJET1200 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

Figures

Tables

Product information

Chapter contents

Introduction

Hardware description

Product specifications

Model and serial numbers

Overview of printer

Front and side view

Back and side view

Overview of optional copier/scanner

Top view

Warranty statement

Extended warranty

Toner cartridge information

Chapter contents

Operating environment

Identifying printer components

Printer control panel

Control panel light patterns

Copier/scanner control panel

Selecting media

Selecting media to print

Selecting media to copy or scan

Loading media

Loading media to print

Loading media to copy or scan

Printer output paths

Maintenance

Chapter contents

Life expectancies of consumables

User-replaceable parts

Replacing the printer pickup roller

Replacing the printer separation pad

Replacing the copier/ scanner separation pad

Cleaning the equipment

Cleaning the print path

Cleaning the toner cartridge area

Cleaning the printer pickup roller

Cleaning the printer separation pad

Cleaning and recalibrating the copier/scanner

Cleaning the scanner path

Operational overview

Chapter contents

Basic functions

Formatter system

Control panel

Draft mode

Enhanced I/O

PJL overview

Printer functions

Engine control unit/power system

Image formation system

Printer paper-feed system

Jam detection

Optional copier/scanner

Optical system

Document pickup and feed systems

Chapter contents

Removal and replacement strategy

Required tools

Before performing service

Toner cartridge

Parts removal order

Covers

Left side cover

Optional copier/scanner

Back cover

Right side cover

Top cover

Control panel assembly

Front cover assembly

Internal assemblies

Transfer roller