HP LJ1200 Service Manual

HP LaserJet 1200 Printer

Service manual

Copyright Information

© 2001 Hewlett-Packard
Company

All Rights Reserved.
Reproduction, adaptations, or
translation without prior written
permission is prohibited except
as allowed under copyright
laws.

Part number C7044-90906
First edition, March 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.

Contents

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Selecting media. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Selecting media to print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Selecting media to copy or scan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Loading media. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Loading media to print . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Loading media to copy or scan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Printer output paths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

3 Maintenance

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

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

EN Contents 3

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

Copier/scanner recalibration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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

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

4 Contents EN

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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Left plate assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Bottom assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

ECU pan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Paper-feed assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

6 Troubleshooting

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

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

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

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

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

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

NVRAM initialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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

EN Contents 5

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170

Common hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170

Assembly locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

Printer trays & optional copier/scanner . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

Covers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173

Internal assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

Internal components (1 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

Internal components (2 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

Electrical components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179

Paper pickup assembly (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Paper pickup assembly (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

Fuser assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Alphabetical parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

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

6 Contents EN

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Figure 10. Scanning a business card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Figure 11. Output bin. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

Figure 12. Straight-through output door. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

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

EN 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 (1 of 2) . . . . . . . . . . . . . . . . . . . . . . 117

Figure 62. Removing the pickup roller shaft (2 of 2) . . . . . . . . . . . . . . . . . . . . . . 118

Figure 63. Removing the paper lift plate assembly . . . . . . . . . . . . . . . . . . . . . . . 119

Figure 64. Removing the left plate assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Figure 65. Removing the ECU pan (1 of 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Figure 66. Removing the ECU pan (2 of 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122

Figure 67. Removing the ECU pan (3 of 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Figure 68. Removing the ECU pan (4 of 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

Figure 69. Removing the paper-feed assembly (1 of 4) . . . . . . . . . . . . . . . . . . . 125

Figure 70. Removing the paper-feed assembly (2 of 4) . . . . . . . . . . . . . . . . . . . 126

Figure 71. Removing the paper-feed mechanism (3 of 4) . . . . . . . . . . . . . . . . . . 127

Figure 72. Removing the paper-feed mechanism (4 of 4) . . . . . . . . . . . . . . . . . . 128

Figure 73. Control panel location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Figure 74. Engine test switch. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149

Figure 75. Locating connectors for the heating element check . . . . . . . . . . . . . . 152

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

Figure 77. Toner cartridge high-voltage connection points (left side) . . . . . . . . . 153

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

Figure 79. High-voltage connector assembly (left side). . . . . . . . . . . . . . . . . . . . 154

Figure 80. Overriding SW301 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

Figure 81. Self-test page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

Figure 82. Repetitive image defect ruler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

Figure 83. Main wiring (1 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

Figure 84. Main wiring (2 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

Figure 85. Locations of printer connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

Figure 86. Locations of copier/scanner connectors. . . . . . . . . . . . . . . . . . . . . . . 164

Figure 87. Locations of LEDs, jumpers, and switches. . . . . . . . . . . . . . . . . . . . . 165

Figure 88. Assembly locations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

8 Figures EN

Figure 89. Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173

Figure 90. Internal components (1 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

Figure 91. Internal components (2 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

Figure 92. Electrical components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179

Figure 93. Paper pickup assembly (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Figure 94. Paper pickup assembly (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

Figure 95. Fuser assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

EN Figures 9

10 Figures EN

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170

Table 26. Printer trays and optional copier/scanner. . . . . . . . . . . . . . . . . . . . . . 172

Table 27. External covers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174

Table 28. Internal components (1 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176

Table 29. Internal components (2 of 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

Table 30. Electrical components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180

Table 31. Paper pickup assembly (1 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

Table 32. Paper pickup assembly (2 of 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184

Table 33. Fuser assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186

Table 34. Alphabetical parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

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

EN Tables 11

12 Chapter - Tables EN

1Product 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

EN Chapter contents 13

Introduction

The HP LaserJet 1200 printer is designed to:

l Print—Print documents easily with the laser-quality you have

With the optional copier/scanner, you can:

l Copy—Make superior laser-quality copies. With the software,

l Scan—Scan important documents to create electronic files.

Hardware description

The printer provides 1200 dot-per-inch (dpi) printing. 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 sim p le co nt ro l panel
and improved paper handling make this pr od u ct 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.

come to expect from an HP LaserJet printer.

you can make up to 99 copies of a 30-p age original. You can also
enlarge, reduce, adjust contrast, and collate.

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 (10,000 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 EN

Firmware description

The firmware in the printer includes:

l Enhanced PCL 6 with status readback
l 80 TrueType™ fonts, plus Cyrillic, Greek, Hebrew, and Arabic
l Pixel placement, mosaic characters
l Memory Enhancement technology (MEt) with hardware

compression/decompression

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

EN Introduction 15

Product specifications

Table 1. Physical specifications

Category Specification

Height 253 mm (10.0 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

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

(no condensation)

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

(no condensation)

16 Chapter 1 - Product information EN

Table 3. Power specifications

Category Specification

Power
requirements

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

(± 12%), 60 (± 3) Hz

-Or-

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

Note Power sources are not

interchangeable.

Power consumption
(in continuous copy
mode)

Power consumption
(idle)

Power consumption
(off)

Minimum
recommended circuit
capacity

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

EN Introduction 17

Table 6. Print operating acoustical emissi ons specifications

Category Specification

Sound Power Level,
L

(1 bel = 10 decibels)

WAd

Sound Pressure Level,

(operator position)

L

pAm

Sound Pressure Level,
L

(bystander position)

pAm

6.1 B

56 dB

48 dB

Table 7. Copy operating acoustical emissions specifications

Category Specification

Sound Power Level,

(1 bel = 10 decibels)

L

WAd

Sound Pressure Level,
L

(operator position)

pAm

Sound Pressure Level,
L

(bystander position)

pAm

6.4 B

60 dB

50 dB

Table 8. Skew specifications

Category Specification

Print skew—left

0.8% (2 mm over 250 mm in length) for
cut-sheet media)

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

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

Print skew—right

1.5% (3.3 mm over 220 mm in width) for
envelopes, postcards, A5, and cut-sheet
media

Cut-sheet leading
edge skew

Scan skew

0.87% (1.6 mm over 190 mm in width)

1.2%

18 Chapter 1 - Product information EN

Model and serial numbers

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

The serial number contains inf ormation 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

EN Model and serial numbers 19

Overview of printer

Front and side view

1

8

7

6

Figure 2. Front and side view

1 Printer control pan el

2

3

4

5

2 Long media extension (output bin)
3 Toner cartridge door
4 Priority input tray
5 Side media guides for the main input tray
6 Long 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 EN

Back and side view

16

15

14

Figure 3. Back and side view

9 Fuser release levers
10 Connection to optional copier/scanner
11 Left side cover

13

12

109

11

12 Parallel port
13 USB port
14 Power receptacle
15 Power switch (220-240 volt printers)
16 Straight-through output door

EN Overview of printer 21

Overview of optional copier/scanner

Top view

1

2

8

7

Figure 4. Top view

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

3

4

5

6

4 Copier/scanne r do or 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 EN

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 . Replace ment products ma y be ei ther ne w or li k e-ne w.

2. HP warrants to you that HP software will not fail to execute its programming
instructions after the date of purchase, for 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 programming instructions due 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.

EN 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 EN

Toner cartridge information

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

At 5% 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 cartridg e 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:

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

covered under Hewlett-Packard warranty or maintenance
contracts.

l 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.

l The print quality of HP LaserJet toner cartridges influences 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.

EN Toner cartridge information 25

26 Chapter 1 - Product information EN

Installation and

2

operation

Chapter contents

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

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

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

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

Copier/scanner control panel . . . . . . . . . . . . . . . . . . . .33

Selecting media . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Selecting media to print . . . . . . . . . . . . . . . . . . . . . . . . 34

Selecting media to copy or scan. . . . . . . . . . . . . . . . . .35

Loading media to copy or scan. . . . . . . . . . . . . . . . . . .37

Loading media . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

Loading media to print . . . . . . . . . . . . . . . . . . . . . . . . . 36

Printer output paths . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

EN Chapter contents 27

Operating environment

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

l temperature: 10° to 32.5° C (50° to 90.5° F)
l humidity: 20% to 80% relative humidity (no condensation)
l away from direct sunlight, open flames, and ammonia fumes
l sufficient space around the printer to allow fo r prop er access an d

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 EN

Identifying printer components

Printer control panel

The printer control panel has two lights and one lighted button. These
lights produce patterns that identify the printer status.

Figure 7. Printer control panel

l GO button and light—To print a self-test page or to continue

printing while in manual feed mode, press and release the G
button.

l Ready light—Indicates that the printer is ready to print.
l Attention light—Indicates that the main input tra y is empty, toner

cartridge door is open, toner cartridge is missing, or other errors.

Ready light (green)

Go button and light

Go button and light
(green)

(green)

Attention light (amber)

O

EN Identifying printer components 29

Control panel light patterns

Light status legend

Symbol for “light off”
Symbol for “light on”

Symbol for “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.

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

Wait for the job to print.

GO button on

30 Chapter 2 - Installation and operation EN

Table 9. Control panel light messages (continued)

Light status Condition of the printer Action

Manual feed or out of memory

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

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

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

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

GO button.

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.

l To continue printing, press and release

GO button.

the

l Reduce the resolution. See the user

guide for more information.

l Add more memory. See the user guide

for more information.

l Make sure that the toner cartridge door

is completely closed.

l Make sure that the media is loaded

correctly. See the user guide for
instructions.

l Make sure that the toner cartridge is

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

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

paper jam. See the user guide for
instructions.

Printer initialization/Cancel Job/

No action is necessary.

Cleaning Mode

A printer initialization is taking
place. If all lights blink for half of
a second or longer in a
sequence:

l the printer is initializing
l all previously sent print jobs

are being purged

l a cleaning page is being

printed

EN Identifying printer components 31

Table 9. Control panel light messages (continued)

Light status Condition of the printer Action

Fatal error

All lights are on.

Accessory error

All lights are blinking.

l Turn the printer off and then back on.

l Unplug the printer for 5 minutes, and

then plug it back in.

l If the printer still has an error, see

chapter 6, “Troubleshooting.”

l Remove the DIMMs and reseat. See the

user guide for instructions.

l If the printer still has an error, replace the

DIMMs.

32 Chapter 2 - Installation and operation EN

Copier/scanner control panel

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

C

OPY and SCAN.

Figure 9. Copier/scanner control panel

l Copy—To perform Quick Copies, even if your computer is

powered off, press C

l Scan—To launch HP LaserJet Director, press SCAN. If

HP LaserJet Director is configured correctly, you can perform the
following tasks:

• Scan to Email

• Store documents electronically

• Edit text with Optical Character Recognition (OCR)

• Make multiple, customized, and color copies

OPY.

COPY button and
light (clear)

CAN button and

S
light (clear)

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

press both buttons.

EN Identifying printer components 33

Selecting media

Selecting media to print

You can use paper with up to 100% 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 e nvelope,
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:

2

(16 to 24 lb)

2

(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

34 Chapter 2 - Installation and operation EN

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 follo wing are the
supported media sizes:

l Minimum: 45 by 89 mm (1.7 by 3.5 inches)
l Maximum: 216 by 356 mm (8.5 by 14 inches)

In addition, you can scan and cop y man y different types of media that
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 transpa re nc y, tape
the leading edges together , and load y our original between the sh eets.

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

76.2 by 127 mm (3 by 5 inches) through the straight-through output
path. Y ou can also tape them to the leading edge of a carrier sheet and
feed them to the straight-through output bin.

Perform the following actions to minimize the possibility of jams:

l Remove self-stick notes.
l Remove staples and paper clips.
l Straighten any curls or wrinkles in documents before put ting them

into the document feeder tray.

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

on it.

l Do not insert gum-backed paper or labels.
l Place documents with tears, perforations, or punch ho les in a

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

l Avoid multiple-copy forms.
l Do not scan originals that are larger or smaller than supported

size limitations. See the user guide for more information.

Note T o obtain good results , it is important that you use the correct resolution

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

EN Selecting media 35

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 u p to 10 pages of 75 g/m2 (20 lb) paper or
one envelop e, tr ansparency, or card. Load media with the top f orw ard
and the side to be printed facing up. To prevent jams and skew,
always adjust the side medi a guides.

CAUTION If you try to print on media that is wrinkled, folded, or damaged in any

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

Note When you add new media, mak e sure that you remo ve all of the media

from the input tray and straighten the stack of new media. This helps
preve nt multiple sheets of media from feeding through the printer at
one time, reducing paper jams.

Specific types of media

l Transparencies and labels: Load transparencies and labels

with the top forward and the side to be printed facing up. See the
user guide for more information.

l Envelopes: Load envelopes with the narrow, stamp side forward

and the side to be printed facing up. See the user guide for more
information.

l Letterhead or preprinted forms: Load with the top forward and

the side to be printed facing up. See the user guide for more
information.

l 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.

36 Chapter 2 - Installation and operation EN

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 sid e (callo ut 1) facing 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.
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 text (OCR), ma ke 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.

CAN to scan or press COPY for a copy.

2

1

EN Loading media 37

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 nor mal and
large, collated documents.

Figure 11. Output bin

Straight-through output path

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 .

Pull out for
long media.

Figure 12. Straight-through output door
Note Printed media does not stack wh en you use the straight-t hrough output

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

38 Chapter 2 - Installation and operation EN

3Maintenance

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

Copier/scanner recalibration. . . . . . . . . . . . . . . . . . . . .51

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

EN Chapter contents 39

Life expectancies of consumables

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

The following table lists approximate schedules for replacing
consumables.

Table 11. Life expectancies of consumables

Estimated

Description Part number

Toner cartridge (user
replaceable)

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

Printer pickup roller RFO-1008-000CN 25,000 Look for glazing and/or cracks.
Printer separation pad RFO-1014-000CN 25,000 Can affect paper movement.
Printer subpads RAO-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 5% 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.

life (pages) Remarks

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

paper movement.

movement.

movement.

User-replaceable parts

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

40 Chapter 3 - Maintenance EN

Replacing the printer pickup roller

1

2

3

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.

4

5

EN User-replaceable parts 41

6

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

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.

8

9

42 Chapter 3 - Maintenance EN

Replacing the printer separation pad

1

2

3

4

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.

5

EN User-replaceable parts 43

6

7

8

6 With one hand, re ac h th ro ug h th e

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.

8 Reinstall the input trays, and then

plug the printer in to turn it back on.

44 Chapter 3 - Maintenance EN

Replacing the copier/scanner separation pad

1

2

2

3

If the optional copier/scanner feeds mor e
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 Press the copier/scanner door

release button and open the copier/
scanner door.

2 Locate the copier/scanner

separation pad and lift it straight up.

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

4

EN 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:

l Any time a new toner cartridge is installed.
l After printing approximately 2,500 pag es.
l Whenever print quality problems appear.

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

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

WARNING! Avoid tou ching 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 EN

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, you can use paper. If you must use

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.
3 Press and hold the G

feeds through the printer slowly. Discard the transparency.

Note After you press and hold th e GO button, the three printer lights blink

until the cleaning process is complete.

O button for 10 seconds. The transparency

EN Cleaning the equipment 47

Cleaning the toner cartridge area

1

2

3

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.

4

48 Chapter 3 - Maintenance EN

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.

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

1

2

3

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

Remove the pic kup roller as de scribed 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.

EN Cleaning the equipment 49

Cleaning the printer separation pad

1

4

1

2

3

11

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

1 Remove the separat ion 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.

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.

50 Chapter 3 - Maintenance EN

Copier/scanner recalibration

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

1

2

3

You might have to clean the copier/
scanner if you can smudge the ink on
documents you scan, if the documents
have excessive amounts of dust or dirt
on them, or if there are smudges or other
marks on documents or scans of
documents.

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 scanner to cool.

2 Open the scanner door.
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.

EN Cleaning the equipment 51

4

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

5

cord.

5 Plug the printer in to turn it back on.

52 Chapter 3 - Maintenance EN

4Operational 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

EN 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:

l formatter
l printer functions

• engine control unit (ECU) system/power system

• image formation system

• paper-feed system (printer) and

l optical system (optional copier/scanner)

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

Figure 13. Basic configuration

54 Chapter 4 - Operational overview EN

Formatter system

The formatter is responsible for the following:

l controlling the optional copier/scanner
l formatting and controlling copies
l receiving and processing print data from the printer interface
l monitoring the control panel and relaying printer status

information

l developing and coordinating data placement and ti ming with the

print engine

l 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 printing
process begins.

Central processing unit

The formatter incorporates an embed ded Coldfire V3 microprocessor
operating at 90 MHz.

RAM

l One bank of Non-Volatile RAM (NVRAM) stores parameters.
l 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.

EN Formatter system 55

Control panel

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

Draft mode

Depending on which printer driver is used, selecting draft or
EconoMode from the printer driver allows the printer to use
approximately 50% less toner, extending the life of the toner
cartridge.

MEt

The Hewlett-Packard Memory Enhancement technology (MEt )
effectively doubles the standard memory through a varie ty 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 Enha nced I/ O is
enabled, you can send more data to the print e r in sh or ter amo unt s of
time, which allows you to return to your application sooner. Enhan ced
I/O has the following options:

l Auto—allows the printer to use Enhanced I/O memory allocation

to increase the speed of data transfer from the host computer to
the printer, if necessary.

l Off—uses the minimum amount of printer memory for storing

data sent from the host computer.

l 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 text)
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

56 Chapter 4 - Operational overview EN

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.

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:

l 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.

l Isolation of print envir onment settings from on e print job to the

next. For example, if a print job is sent to t he print er in lan dscape
mode, the subsequent print jobs print in landscape only if they
are formatted for landscape printing.

EN Formatter system 57

Printer functions

Printer functions are divided into five groups:

l engine control
l formatter
l image formation
l laser/scanner
l pickup and feed

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

Figure 14. Printer unit functional block diagram

58 Chapter 4 - Operational overview EN

Engine control unit/power system

The engine control unit (ECU) coordinates all print engine activities,
drives the laser, and coordinates print data from the for matter 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:

l Printer engine control

• paper motion monitoring and control (printing)

• motor

l Printer laser/scanner
l Power sy stem

• AC power distribution

• DC power distribution

• overcurrent/overvoltage protection

• high-voltage power distribution

EN Printer functions 59

The following figure shows the various ECU loads:

Figure 15. ECU loads

60 Chapter 4 - Operational overview EN

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 operatio n

EN 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 distr ibut ed 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:

l +3.3 Vdc: Formatter

Laser/beam detect circuitry ECU
Photosensors

l +5 Vdc: Formatter

ECU
Laser/beam detect circuitry

l +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:

l 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.

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

overcurrent protection circuit th at au tomatically 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 EN

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 t he pr int densit y
setting.

High voltage is disabled when the printer door is open.

Figure 17. High-voltage power supply circuit

EN 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 pen dently 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 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 sitive properties 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 shut ter. 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 EN

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 cartridge.
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 roller
applies a negative DC bias to create a uniform negati ve pot en ti al
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 finally
through a slot in the top of the toner cartridge, and onto the
photosensitive drum. The beam sweeps the drum from lef t 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 dr um can be covered.
At the end of each sweep, the beam strikes the beam dete ct 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 d ischarged ( exposed,
grounded) areas of the drum, and it is repelled from the
negatively charged (unexposed) areas.

4 Transf e r 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.

EN 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 of the drum and
stores it in the waste toner receptacle.

66 Chapter 4 - Operational overview EN

Printer paper-feed system

Step 1 The main input tray and the priority input tray merge into 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 the
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 fuser

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.

EN Printer functions 67

Figure 19. Printer path

68 Chapter 4 - Operational overview EN

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 immediat ely
stops the printing process and displays a jam message on the control
panel.

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

l Pickup delay jam—Media does not reach the paper top sensor

(PS402) after the pickup solenoid (SL 001) has been turned on
twice (the original pickup plus a retry) within 2.8 seconds.

l 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.

l Delivery-delay jam—The paper delivery sensor (PS401) does

not detect the leading edge of media within 2.1 seco nds aft er th e
paper top sensor (PS402) detects the leading edge.

l 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 the leading edge and withi n 10
seconds after the paper delivery sensor (PS401) detects the
leading edge.

l Delivery-stationary jam—The paper delivery sensor (PS401)

does not detect the leading edge of medi a within 2.2 seconds
after the paper top sensor (PS402) detects the trailing edge.

l Residual paper jam—The paper top sensor (PS402) or the

paper delivery sensor (PS401) detect media in the initial rotation
period.

EN Printer functions 69

2

Solenoid, photosensors, and switches

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

1

6

3

4

7

5

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 enstive 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 EN

Optional copier/scanner

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

Optical system

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

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

The light source has three LEDs and is controlled by the formatter.
Light reflected from documents pa sses through the rod lens array 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 phototransisto rs. The
image data is converted and sent from the driv er circu i ts 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 th e top and bottom edges of
the document.

EN 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 EN

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.

EN Optional copier/scanner 73

Figure 22. General timing diagram

74 Chapter 4 - Operational overview EN

Removal and

5

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

EN Chapter contents 75

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

Paper lift plate assembly . . . . . . . . . . . . . . . . . . . . . . 119

Left plate assembly . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Bottom assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

ECU pan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Paper-feed assembly. . . . . . . . . . . . . . . . . . . . . . . . . 125

76 Chapter 5 - Removal and replacement EN

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 HP LaserJet 1200 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 b eam, although
invisible, can damage your eyes.

The sheet metal edges of the printer can be sharp. Use caution wh en
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

l #2 Phillips-head screwdriver with magnetic tip
l Small flatblade screwdriver
l Needle nose pliers
l ESD mat
l Penlight

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

#2 Phillips-head screwdriver.

EN Removal and replacement strategy 77

Before performing service

l Remove all media from the printer.
l Unplug the power cable.
l Place the printer on an ESD mat.
l Remove the main input tray.
l If the optional copier/scanner is attached, remove the copier/

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

l 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 EN

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

Motor

Note 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.

EN 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.

2

1

Figure 24. Removing the left side cover

80 Chapter 5 - Removal and replacement EN

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 optional
copier/scanner.

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

connector (callout 1) on the formatter.

Note The optional copier/scanner has two tabs that hook 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 Lift the rear of the optional copier/scanner up (callout 2) and pull it

forward (callout 3) to remove it.

2

3

2

2

2

1

Figure 25. Removing the optional copier/sca n ne r

EN 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.

2

1

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

82 Chapter 5 - Removal and replacement EN

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

the back cover off of the printer.

2

1

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

EN 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.

2

1

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

84 Chapter 5 - Removal and replacement EN

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

the bottom of the cover.

2

1

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

EN 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 EN

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.

2

2

2

1

Figure 31. Removing the top cover

EN 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.

2

2

2

3

2

1

2

4

Figure 32. Removing the control panel

88 Chapter 5 - Removal and replacement EN

Front cover assembly

The front cover assembly is composed of three pieces:

l front cover (the frame that surrounds the main input tray)
l toner cartridge door
l 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, 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.

2

1

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

EN 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.

2

1

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

90 Chapter 5 - Removal and replacement EN

Toner cartridge door

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

80 through 87).

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

of the printer, and remove the bracket.

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

of the toner cartridge door arm to release it.

6 Repeat on the left side.

2

1

2

2

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

EN Covers 91

7 Unhook the toner cartridge door hinge on the right side, and slide

the toner cartridge door toward the left to remove it.

2

1

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 EN

Front guide assembly

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

2

1

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

EN Covers 93

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

tab (callout 2).

2

1

2

2

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

94 Chapter 5 - Removal and replacement EN

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

tab (callout 2).

4 Remove the front guide assembly.

2

1

2

2

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

EN 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 underneath t he right

side of the transfer roller.

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

96 Chapter 5 - Removal and replacement EN

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.

2

1

2

3

2

4

2

2

Figure 41. Removing the formatter (1 of 2)

EN 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.

2

1

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 EN

Laser/scanner assembly

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

80 through 87).

2 Disconnect the flat flexible cable from its socket (callout 1) on the

laser/scanner.

3 Disconnect the cable connector (callout 2) from the formatter.

2

1

2

2

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

EN Internal assemblies 99

4 Release the two tab s (ca llo ut 1), on e on ea ch sid e of the sh ut ter

lever, and lift the shutter lever straight up to remove it.

Note Make sure you do not misplace the small spring that is under the shutter

lever.
5 Remove four screws (callout 2) and then lift the assembly off of

the printer.

6

2

2

2

1

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

To reinstall

Insert the spring into the hole on the laser/scanner before you snap
the shutter lever back into place.

100 Chapter 5 - Removal and replacement EN