HP LaserJet 1000 Service Manual

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hp LaserJet 1000 series

service

hp LaserJet 1000 series printer

service

Part number Q1342-90901 First edition, August 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 thi s informatio n . 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 might be trademarks of their respective companies.

Safety Information WARNING! Potentia l 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 1000 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 1000 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.

Figures Tables 1 Product information

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Printer features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Product specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Specification tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Overview of printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Front and side view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Back and side view . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Warranty statement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Extended warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Toner cartridge information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Refilled toner cartridges . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Recycling of toner cartridges . . . . . . . . . . . . . . . . . . . . . . . . .10

2 Removal and replace ment

Removal and replacement strategy. . . . . . . . . . . . . . . . . . . . . . . .13

Required tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Before performing service. . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Parts removal order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Toner cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

External assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Media tray. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

Cable pod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Left side cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Back cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

ECU PCB fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

Output sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Motor. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Right side cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

Solenoid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Q1342-90910 iii

Top cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29

Connector PCB Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . .30

LED status panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31

Front cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Toner cartridge door . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34

Front guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

Internal assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

Transfer roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

Laser/scanner assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . .40

Fuser assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

Output rollers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .46

Face-down delivery assembly . . . . . . . . . . . . . . . . . . . . . .46

Face-up roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

Right plate assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48

Pickup assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

Pickup roller assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

Paper lift plate assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . .54

Left plate assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

Bottom assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

ECU pan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

Paper-feed assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

3 Troubleshooting

Basic troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64

Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67

LED status lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67

Additional error messages . . . . . . . . . . . . . . . . . . . . . . . . . . .70

Checking the toner cartridge . . . . . . . . . . . . . . . . . . . . . . . . .71

To redistribute toner in the cartridge. . . . . . . . . . . . . . . . . .71

Solving image-quality problems . . . . . . . . . . . . . . . . . . . . . . .72

Solving print image-quality problems . . . . . . . . . . . . . . . . .72

Solving paper-feed problems . . . . . . . . . . . . . . . . . . . . . . . . . . . .77

Functional checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79

Engine test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79

Printing an engine test . . . . . . . . . . . . . . . . . . . . . . . . . . . .79

Half self-test functional check . . . . . . . . . . . . . . . . . . . . . . . .81

To perform a half self-test check . . . . . . . . . . . . . . . . . . . .81

To perform other checks. . . . . . . . . . . . . . . . . . . . . . . . . . .81

Drum rotation functional check . . . . . . . . . . . . . . . . . . . . . . .82

Heating-element check . . . . . . . . . . . . . . . . . . . . . . . . . . . . .83

High-voltage power supply check . . . . . . . . . . . . . . . . . . . . .84

To check the toner cartridge connection points . . . . . . . . .84

To check the high-voltage connector assembly . . . . . . . . .85

Paper-path check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86

To override SW301. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86

Troubleshooting tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .87

iv Chapter - Contents Q1342-90910

Repetitive image defect ruler . . . . . . . . . . . . . . . . . . . . . . . .87

Location of ECU Connectors . . . . . . . . . . . . . . . . . . . . . . . . .88

Location of printer connectors. . . . . . . . . . . . . . . . . . . . . . . . .89

4 Parts and diagrams

Ordering parts and supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92

Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92

Related documentation and software . . . . . . . . . . . . . . . . . . .92

Consumables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92

Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93

How to use the parts lists and diagrams . . . . . . . . . . . . . . . . . . . .94

Common hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94

Media tray and cable pod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95

Part numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .95

Covers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96

Part numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97

Internal assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .98

Internal components (1 of 2). . . . . . . . . . . . . . . . . . . . . . . . . .98

Part numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .99

Internal components (2 of 2). . . . . . . . . . . . . . . . . . . . . . . . .100

Part numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101

Electrical components. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .102

Part numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .103

Paper pickup assembly (1 of 2) . . . . . . . . . . . . . . . . . . . . . .104

Part numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105

Paper pickup assembly (2 of 2) . . . . . . . . . . . . . . . . . . . . . .106

Part numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .107

Fuser assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .108

Part numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109

Alphabetical parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .110

Numerical parts list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .112

Index

Q1342-90910 v

vi Chapter - Contents Q1342-90910

Figures

Figure 1. Model and serial number label . . . . . . . . . . . . . . . . . . .3

Figure 2. Front and side view . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Figure 3. Back and side view . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Figure 4. Remove the toner cartridge. . . . . . . . . . . . . . . . . . . . .15

Figure 5. Remove the media tray . . . . . . . . . . . . . . . . . . . . . . . .16

Figure 6. Remove the cable pod . . . . . . . . . . . . . . . . . . . . . . . .17

Figure 7. Remove the left side cover . . . . . . . . . . . . . . . . . . . . .18

Figure 8. Open the straight-through output door . . . . . . . . . . . .19

Figure 9. Remove the back cover. . . . . . . . . . . . . . . . . . . . . . . .20

Figure 10. Remove the ECU PCB fuse . . . . . . . . . . . . . . . . . . . .21

Figure 11. Remove the output sensor . . . . . . . . . . . . . . . . . . . . .22

Figure 12. Remove the motor (fuser removed for clarity). . . . . . .23

Figure 13. Remove the right side cover mounting screw . . . . . . .24

Figure 14. Release the right side cover tab . . . . . . . . . . . . . . . . .25

Figure 15. Remove the right side cover . . . . . . . . . . . . . . . . . . . .26

Figure 16. Disconnect the solenoid wire harness. . . . . . . . . . . . .27

Figure 17. Remove the solenoid. . . . . . . . . . . . . . . . . . . . . . . . . .28

Figure 18. Remove the top cover . . . . . . . . . . . . . . . . . . . . . . . . .29

Figure 19. Remove the connector assembly . . . . . . . . . . . . . . . .30

Figure 20. Remove the LED status panel. . . . . . . . . . . . . . . . . . .31

Figure 21. Remove the front cover mounting screws. . . . . . . . . .32

Figure 22. Remove the front cover. . . . . . . . . . . . . . . . . . . . . . . .33

Figure 23. Release the toner cartridge door connecting links . . .34

Figure 24. Remove the toner cartridge door. . . . . . . . . . . . . . . . .35

Figure 25. Remove the front guide assembly. . . . . . . . . . . . . . . .36

Figure 26. Release the front guide assembly tabs (right side) . . .37

Figure 27. Release the front guide assembly tabs (left side) . . . .38

Figure 28. Remove the transfer roller. . . . . . . . . . . . . . . . . . . . . .39

Figure 29. Disconnect the laser/scanner harnessing . . . . . . . . . .40

Figure 30. Remove the laser/scanner . . . . . . . . . . . . . . . . . . . . .41

Figure 31. Remove the right fuser bracket . . . . . . . . . . . . . . . . . .42

Figure 32. Remove the left fuser bracket . . . . . . . . . . . . . . . . . . .43

Figure 33. Remove the fuser mounting screws . . . . . . . . . . . . . .44

Figure 34. Remove the fuser assembly . . . . . . . . . . . . . . . . . . . .45

Figure 35. Remove the output rollers . . . . . . . . . . . . . . . . . . . . . .46

Figure 36. Remove the face-up rollers . . . . . . . . . . . . . . . . . . . . .47

Figure 37. Remove the gear-clutch assembly . . . . . . . . . . . . . . .48

Q1342-90910 xi

Figure 38. Remove the right plate assembly mounting screws . .49

Figure 39. Remove the pickup assembly mounting screw . . . . . .50

Figure 40. Remove the top pickup assembly mounting screws . .51

Figure 41. Remove the metal shield. . . . . . . . . . . . . . . . . . . . . . .52

Figure 42. Remove the pickup roller assembly . . . . . . . . . . . . . .53

Figure 43. Remove the paper lift plate assembly. . . . . . . . . . . . .54

Figure 44. Remove the left plate assembly . . . . . . . . . . . . . . . . .55

Figure 45. Disconnect the ECU wire harnesses. . . . . . . . . . . . . .56

Figure 46. Remove the ECU mounting screws . . . . . . . . . . . . . .57

Figure 47. Remove the ECU pan . . . . . . . . . . . . . . . . . . . . . . . . .58

Figure 48. Remove the ECU PCB from the pan. . . . . . . . . . . . . .59

Figure 49. Remove wire harnesses . . . . . . . . . . . . . . . . . . . . . . .60

Figure 50. Remove the paper-feed assembly . . . . . . . . . . . . . . .61

Figure 51. Release the paper-feed roller . . . . . . . . . . . . . . . . . . .62

Figure 52. LED status lights location . . . . . . . . . . . . . . . . . . . . . .67

Figure 53. Engine-test button. . . . . . . . . . . . . . . . . . . . . . . . . . . .79

Figure 54. Connectors for the heating element check . . . . . . . . .83

Figure 55. High-voltage connection points (right side) . . . . . . . . .84

Figure 56. High-voltage connection points (left side) . . . . . . . . . .84

Figure 57. High-voltage connector assembly (right side) . . . . . . .85

Figure 58. High-voltage connector assembly (left side) . . . . . . . .85

Figure 59. Override SW301 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86

Figure 60. Repetitive image defect ruler. . . . . . . . . . . . . . . . . . . .87

Figure 61. HP LaserJet 1000 ECU PCB. . . . . . . . . . . . . . . . . . . .88

Figure 62. Printer connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . .89

Figure 63. Media tray and cable pod . . . . . . . . . . . . . . . . . . . . . .95

Figure 64. HP LaserJet 1000 covers . . . . . . . . . . . . . . . . . . . . . .96

Figure 65. Internal components (1 of 2) . . . . . . . . . . . . . . . . . . . .98

Figure 66. Internal componentsm (2 of 2) . . . . . . . . . . . . . . . . .100

Figure 67. Electrical components . . . . . . . . . . . . . . . . . . . . . . . .102

Figure 68. Paper pickup assembly (1 of 2). . . . . . . . . . . . . . . . .104

Figure 69. Paper pickup assembly (2 of 2). . . . . . . . . . . . . . . . .106

Figure 70. Fuser assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . .108

xii Chapter - Figures Q1342-90910

Tables

Table 1. HP LaserJet 1000 Series printer features . . . . . . . . . . .2

Table 2. Physical specifications . . . . . . . . . . . . . . . . . . . . . . . . . .4

Table 3. Environmental specifications . . . . . . . . . . . . . . . . . . . .4

Table 4. Power specifications . . . . . . . . . . . . . . . . . . . . . . . . . . .4

Table 5. Print operating acoustical emissions specifications . . . .5

Table 6. Skew specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Table 7. Basic troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . .64

Table 8. LED status lights legend . . . . . . . . . . . . . . . . . . . . . . .67

Table 9. Status lights messages . . . . . . . . . . . . . . . . . . . . . . . .68

Table 10. Error messages (no LED status panel pattern) . . . . . .70

Table 11. Solving print image-quality problems . . . . . . . . . . . . . .72

Table 12. Solving paper-feed problems. . . . . . . . . . . . . . . . . . . .77

Table 13. Engine test troubleshooting . . . . . . . . . . . . . . . . . . . . .80

Table 14. ECU connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88

Table 15. Printer connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . .89

Table 16. Technical support websites . . . . . . . . . . . . . . . . . . . . .92

Table 17. Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93

Table 18. Common fasteners. . . . . . . . . . . . . . . . . . . . . . . . . . . .94

Table 19. Printer tray and cover. . . . . . . . . . . . . . . . . . . . . . . . . .95

Table 20. Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .97

Table 21. Internal components (1 of 2) . . . . . . . . . . . . . . . . . . . .99

Table 22. Internal components (2 of 2) . . . . . . . . . . . . . . . . . . .101

Table 23. Electrical components . . . . . . . . . . . . . . . . . . . . . . . .103

Table 24. Paper pickup assembly (1 of 2) . . . . . . . . . . . . . . . . .105

Table 25. Paper pickup assembly (2 of 2) . . . . . . . . . . . . . . . . .107

Table 26. Fuser assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . .109

Table 27. Alphabetical parts list . . . . . . . . . . . . . . . . . . . . . . . . .110

Table 28. Numerical parts list. . . . . . . . . . . . . . . . . . . . . . . . . . .112

Q1342-90910 xiii

xiv Chapter - Tables Q1342-90910

1Product information

Chapter contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Printer features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Product specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

Overview of printer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Front and side view . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Back and side view. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Warranty statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Extended warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Toner cartridge information . . . . . . . . . . . . . . . . . . . . . . . . . .10

Refilled toner cartridges . . . . . . . . . . . . . . . . . . . . . . . .10

Recycling of toner cartridges . . . . . . . . . . . . . . . . . . . . 10

Q1342-90910 Chapter contents 1

Introduction

This manual contains the necessary information to service the HP LaserJet 1000 Series printer. Service topics include printer features, product specifications, location of model and serial numbers, warranty information, toner cartridge information, part removal procedures, troubleshooting procedures, and an illustrated parts chapter.

Hint See the HP LaserJet 1000 Series printer user guide for information

about printer installation, use, and operation.

Printer features

Table 1. HP LaserJet 1000 Series printer features

Speed z 10 pages per minute (ppm) letter-size media Resolution Connectivity

Media handling

Toner Duty cycle Memory

Microsoft

operating

systems supported

PCL printer language

z 600 dot-per-inch (dpi) printing z 1.1 universal serial bus (USB) port

z External cable pod (formatter) z The HP LaserJet 1000 Series printer is

designed for use only with an IBM-compatible computer

z 250-sheet input tray z 125-sheet output bin

z 2500 page toner cartridge life z 1000 page-per-month average z 1 MB SDRAM z Windows

z Windows z Windows z Windows

z Enhanced PCL 5e (with MS-DOS

98 2000 Millennium Edition (Me) XP

emulation)

2 Chapter 1 - Product information Q1342-90910

Product specifications

Identification

The model number and serial numbers are listed on an identification label located on the bottom of the printer. The serial number contains information about the country of origin and the revision level, production code, and production number of the printer. The label also identifies power rating and regu la tor y inf ormati on.

Figure 1. Model and serial number label

Q1342-90910 Product specifications 3

Specification tables

Table 2. Physical specifications

Category Specification

Height 253 mm (10 inches) Depth 486 mm (19.1 inches) Width 415 mm (16.3 inches) Weight (toner

cartridge installed)

Table 3. Environmental specifications

Category Specification

Operating environment (printer plugged into an ac outlet)

Printer storage environment (printer not plugged into an ac outlet)

Toner cartridge storage environment (printer not plugged into an ac outlet)

7.3 kg (16.1 lb)

z Temperature: 15° to 32.5° C (59° to 90.5° F) z Humidity: 10 to 80 percent relative humidity

(no condensation)

z Temperature: -20° to 60° C (-4° to 140° F) z Humidity: 10 to 90 percent relative humidity

(no condensation)

z Temperature: -20° to 40° C (-4° to 104° F) z Humidity: 10 to 90 percent relative humidity

(no condensation)

Table 4. Power specifications

Category Specification

Power requirements

z 110 Vac (± 12 percent), 60 (± 3) Hz; 127 Vac

(± 12 percent), 60 (± 3) Hz

-Or-

z 220 Vac (± 12 percent), 50/60 (± 3) Hz z 240 Vac (± 12 percent), 50 (± 3) Hz

WARNING! Power sources are not

interchangeable.

CAUTION To prevent damage to the

printer, always connect it to a surge-protected power source.

4 Chapter 1 - Product information Q1342-90910

Table 4. Power specifications (continued)

Category Specification

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 5. Print operating acoustical emissions specifications

Category Specification

Sound power level,

(1 bel = 10 decibels)

WAd

Sound pressure level,

(operator position)

pAm

Sound pressure level, L

(bystander position)

pAm

6.1 dB(A)

56 dB(A)

48 dB(A)

Table 6. Skew specifications

Category Specification

Print skew—left 0.8 percent (2 mm on medi a 250 mm in le ngth) for

cut-sheet me dia

1.5 percent (3.3 mm on media 220 mm in length) for cut-sheet media

0.87 percent (1.65 mm on m edia19 0 mm in w idth) for cut-sheet media

Print skew—right 1.5 percent (3.3 mm on media 220 mm in width)

for envelopes, pos tcards, A5, and cu t-sh eet me dia

Cut-sheet leading edge skew

Q1342-90910 Product specifications 5

0.87 percent (1.6 mm on media 190 mm in width)

Overview of printer

Front and side view

Figure 2. Front and side view

1 LED status lights 2 Output bin 3 Toner cartridge door 4 Input tray 5 Sliding side media guides 6 Long media support for the input tray 7 Input tray cover

6 Chapter 1 - Product information Q1342-90910

Back and side view

Figure 3. Back and side view

8 Media jam release levers 9 Port for the USB cable pod 10 Engine test button 11 Power receptacle 12 Straight-through output door

Q1342-90910 Overview of printer 7

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. The customer is responsible for maintaining proof of date of purchase. 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. Any replacement products may be either new or like-new, provided that it has functionality at least equal to that of the product being replaced.

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 a 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.

8 Chapter 1 - Product information Q1342-90910

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 incidental 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 (document number is 9036) within 180 days of the HP product purchase. Customers can contact the nearest HP-authorized dealer about this service.

Q1342-90910 Warranty statement 9

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 five percent page coverage, a toner cartridge prints approximately 2500 pages. However, a toner cartridge should print more pages if it regularly prints pages with less coverage, such as short memos. The cartridge might print fewer pages if heavy or bold print is used.

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

Refilled toner cartridges

Although 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:

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

covered under Hewlett-Packard warranty or maintenance contracts.

z 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.

z The print quality of HP LaserJet toner cartridges influences the

customer’s percepti on of the printer . Hewl ett-P ack ar d has no control over the actual print quality of a refilled toner cartridge.

Recycling of toner cartridges

In order to reduce waste, Hewlett-Packard offers a recycling program. Cartridge components that do not wear out are recycled. Plastics and other materials are recycled. Hewlett-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.

10 Chapter 1 - Product information Q1342-90910

Removal and

replacement

Chapter contents

Required tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Before performing service . . . . . . . . . . . . . . . . . . . . . .13

Toner cartridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Parts removal order . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Toner cartridge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Left side cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Back cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

ECU PCB fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23

Solenoid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27

Connector PCB Assembly . . . . . . . . . . . . . . . . . . . . . . 30

Front cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32

Toner cartridge door. . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Front guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36

Internal assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

Transfer roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39

Laser/scanner assembly. . . . . . . . . . . . . . . . . . . . . . . .40

Output rollers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

Face-up roller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .47

Right plate assembly . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Q1342-90910 Chapter contents 11

Pickup assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Pickup roller assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . .53

Paper lift plate assembly . . . . . . . . . . . . . . . . . . . . . . . . . . .54

Left plate assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55

Bottom assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

ECU pan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

Paper-feed assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .60

12 Chapter 2 - Removal and replacement Q1342-90910

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 and hints are included to provide directions for difficult or critical replacement procedures.

WARNING! Unplug the power cord from the power source before servicing the

printer. Failure to follow this warning can result in personal injury or damage to the printer. Certain functional checks during troubleshooting require power supplied to the printer. However, power should be disconnected when removing assemblies.

Never operate the printer with the laser/scanner assembly exposed. The reflected beam, although invisible, can damage your eyes. When servicing the printer, replace the top cover before operating the printer.

CAUTION The printer contains electrostatic discharge (ESD) sensitive

components. Always perform service work at an ESD-protected workstation. If an ESD-protected workstation is not available, discharge body static and ground the printer chassis before servicing the printer.

Required tools

z #2 Phillips screwdriver with magnetic tip z Small flat-blade screwdriver z Needle-nose pliers z penlight (optional)

Note Use of a Posidrive screwdriver damages screw-heads on the printer.

Use a #2 Phillips screwdriver.

Hint 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.

Before performing service

z Unplug the power cable and remove all media from the printer. z Place the printer on an ESD mat or discharge body static and

ground the printer chassis.

z Remove the toner cartridge and media tray. See “Toner

cartridge” on page 15 and “Media tray” on page 16.

Q1342-90910 Removal and replacement strategy 13

Parts removal order

Use the following diagram to determine the order in which parts must be removed.

Toner cartridge

Media tray Cable pod

Left side cover

Back cover

ECU PCB fuse Output sensor Motor Right cover

Transfer roller Solenoid

Top Cover

LED status panel

Connector PCB

Front cover

Toner cartridge door

Front guide

Fuser assembly (see note)

Right plate assembly

Pickup assembly

Pickup roller

Paper lift

Left plate assembly Laser/scanner assembly Fuser assembly

Face-down roller

Face-up roller ECU pan Paper feed assembly

Note The fuser assembly is intentionally listed twice.

14 Chapter 2 - Removal and replacement Q1342-90910

Toner cartridge

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

it with a piece of paper.

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

1 Open the toner cartridge door. 2 Remove the toner cartridge.

Figure 4. Remove the toner cartridge

Q1342-90910 Removal and replacement strategy 15

External assemblies

Media tray

1 Lift off the media tray cover (callout 1). 2 Slightly tilt up the media tray and pull it away from the printer.

Figure 5. Remove the media tray

16 Chapter 2 - Removal and replacement Q1342-90910

Cable pod

1 Turn the two pod thumbscrews counterclockwise until they turn

freely.

2 Grasp the pod, and gently pull it away from the printer.

Figure 6. Remove the cable pod Hint For easier installation, start tightening the top thumbscrew (do not fully

tighten) and then tighten the bottom thumbscrew when replacing the cable pod. Make sure to fully tighten both thumbscrews.

Q1342-90910 External assemblies 17

Left side cover

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17.

2 Open the toner cartridge door. 3 Remove the single left-cover retaining screw (callout 1). 4 Pull out on the rear of the cover and rotate it away from the

printer.

Figure 7. Remove the left side cover Hint It might be necessary to release the left side cover-locking tab found

under the printer.

Hint The left-side retaining screw is slightly longer than similar screws used

in the printer. Keep this screw separated from other screws while servicing the printer to avoid misplacing it.

18 Chapter 2 - Removal and replacement Q1342-90910

Back cover

1 Remove the following assemblies:

z Toner cartridge, media tray, cable pod, and left side cover. See

“Toner cartridge” on page 15 through “Left side cover” on page 18.

2 Open the straight-through output door (callout 1). 3 Remove the single screw (callout 2) from the back of the printer.

Figure 8. Open the straight-through output door

Q1342-90910 External assemblies 19

4 Release the two locking tabs (not shown). The left tab is located

under the printer and the right tab is located on the right side of the printer, near the cable pod port.

5 Press down and hold the two green jam-release levers (callout 3)

and pull the cover off of the printer.

Figure 9. Remove the back cover CAUTION When replacing the back cover, verify that the bottom left retainer tab

(under the printer) is inside the printer chassis. This tab can be broken if not properly inserted into the printer chassis.

20 Chapter 2 - Removal and replacement Q1342-90910

ECU PCB fuse

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17.

z Left side and back covers. See “Left side cover” on page 18

through “Back cover” on page 19.

2 Grasp the ECU PCB fuse (callout 1) and pull it out of the

mounting clips.

Figure 10. Remove the ECU PCB fuse WARNING! To protect against the risk of fire, always replace the ECU PCB fuse

with the same type and rating fuse. Fuse type and rating is printed on the ECU PCB next to the fuse.

Note Purchase this fuse at a local hardware store or from an electrical

component supplier.

Q1342-90910 External assemblies 21

Output sensor

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17.

z Left side and back covers. See “Left side cover” on page 18

through “Back cover” on page 19.

2 Disconnect the output sensor (callout 1) wire harness (at the ECU

end). Unlace the harness from the harness lance points.

3 Remove the single output sensor mounting screw and remove

the sensor.

Figure 11. Remove the output sensor

22 Chapter 2 - Removal and replacement Q1342-90910

Motor

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17.

z Left side and back covers. See “Left side cover” on page 18

through “Back cover” on page 19.

Hint Removing the fuser is not necessary, but doing so will make replacing

the motor easier. See “Fuser assembly” on page 42. 2 Disconnect the motor cable connector (callout 1) on the side of

the motor.

3 Remove the two screws (callout 2) from the motor and lift the

motor out of the printer.

Figure 12. Remove the motor (fuser removed for clarity) Note When replacing the motor, verify that the connector (callout 1) is

located toward the front of the printer.

Q1342-90910 External assemblies 23

Right side cover

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17.

z Left side and back covers. See “Left side cover” on page 18

through “Back cover” on page 19.

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

Figure 13. Remove the right side cover mounting screw

24 Chapter 2 - Removal and replacement Q1342-90910

4 Lift the right side of the printer and release the tab (callout 2) on

the bottom of the cover.

Figure 14. Release the right side cover tab

Q1342-90910 External assemblies 25

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

cover and rotate it away from the printer.

Figure 15. Remove the right side cover

26 Chapter 2 - Removal and replacement Q1342-90910

Solenoid

1 Remove the following assemblies:

z Toner cartridge, media tray and formatter pod. See “Toner

cartridge” on page 15 through “Cable pod” on page 17.

z Left side, back, and right side covers. See “Left side cover” on

page 18 through “Right side cover” on page 24.

2 Unplug the brown solenoid wire connector (callout 1) from the

ECU and carefully unwind the solenoid harness from the harness lance points (callout 2).

222

Figure 16. Disconnect the solenoid wire harness

Q1342-90910 External assemblies 27

3 Remove the screw (callout 3) on the solenoid. 4 Gently thread the solenoid cable through the hole (callout 4) in

the right side plate.

5 Lift the solenoid off of the printer.

Figure 17. Remove the solenoid

28 Chapter 2 - Removal and replacement Q1342-90910

Top cover

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17

z Left side, back, and right side covers. See “Left side cover” on

page 18 through “Right side cover” on page 24.

2 Open the toner cartridge door. 3 Loosen, but do not remove, the two screws (callout 1) on the

back of the printer.

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

Figure 18. Remove the top cover

Q1342-90910 External assemblies 29

Connector PCB Assembly

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17.

z Left side, back, right side, and top covers. See “Left side cover”

on page 18 throu gh “Top cover” on page 29.

2 Open the toner cartridge door. 3 Disconnect the laser scanner ribbon cable (at the laser/scanner

end), laser scanner wire harness, LED status panel wire harness, and ECU ribbon cable.

4 Remove the three connector PCB assembly mounting screws

(callout 1), and remove the assembly.

Figure 19. Remove the connector assembly

30 Chapter 2 - Removal and replacement Q1342-90910

LED status panel

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17.

z Left side, back, right side, and top covers. See “Left side cover”

on page 18 throu gh “Top cover” on page 29.

2 Open the toner cartridge door. 3 Disconnect the status panel cable (callout 1) from the connector

assembly. Unlace the harness from the harness clip.

4 Remove two screws (callout 2) from the top of the control panel

assembly.

5 Lift and remove the panel assembly.

Figure 20. Remove the LED status panel Hint When replacing the LED status panel assembly, verify that the locator

tab (callout 3) is correctly positioned in the provided hole.

Q1342-90910 External assemblies 31

Front cover

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17.

z Left side, back, right side, and top covers. See “Left side cover”

on page 18 throu gh “Top cover” on page 29.

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

the cover.

Figure 21. Remove the front cover mounting screws

32 Chapter 2 - Removal and replacement Q1342-90910

4 Pull forward on the top of the front cover to release the three front

cover tabs (callout 2).

5 Slightly raise the front of the printer and rotate the top of the cover

toward you to release the tabs on the bottom of the front cover. Remove the front cover.

Figure 22. Remove the front cover

Q1342-90910 External assemblies 33

Toner cartridge door

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17.

z Left side, back, right side, and top covers. See “Left side cover”

on page 18 throu gh “Top cover” on page 29.

z Front cover. See “Front cover” on page 32.

2 Open the toner cartridge door. 3 Press the two small tabs (callout 1) on the inside of the right

connecting link to release it.

4 Repeat on the left side.

Figure 23. Release the toner cartridge door connecting links

34 Chapter 2 - Removal and replacement Q1342-90910

5 Unhook the right side toner cartridge door hinge and slide the

toner cartridge door toward the left to remove it.

Figure 24. Remove the toner cartridge door CAUTION When the cartridge door is replaced, the hinge must be behind the door

stop (callout 2). The door will not close if the door is installed with the hinge in front of or on top of the door stop.

Hint After the toner cartridge door is removed, it is easy to remove the two

connecting links.

Q1342-90910 External assemblies 35

Front guide

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17.

z Left side, back, right side, and top covers. See “Left side cover”

on page 18 throu gh “Top cover” on page 29.

z Front cover and toner cartridge door. See “Front cover” on

page 32 through “Toner cartridge door” on page 34.

2 Remove the two front guide mounting screws (callout 1).

Figure 25. Remove the front guide assembly

36 Chapter 2 - Removal and replacement Q1342-90910

3 Release the two right side front guide tabs (callout 2).

Figure 26. Release the front guide assembly tabs (right side)

Q1342-90910 External assemblies 37

4 Release the two front guide tabs on the left side (callout 3). 5 Remove the front guide assembly.

Figure 27. Release the front guide assembly tabs (left side)

38 Chapter 2 - Removal and replacement Q1342-90910

Internal assemblies

Transfer roller

1 Remove the following assemblies:

z Toner cartridge and media tray. See “Toner cartridge” on page 15

through “Media tray” on page 16.

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.

CAUTION Skin oils can damage the transfer roller sponge. Do not touch the black

transfer roller sponge.

Figure 28. Remove the transfer roller Hint Do not misplace the small grounding spring that is underneath the right

side of the transfer roller.

Q1342-90910 Internal assemblies 39

Laser/scanner assembly

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17.

z Left side, back, right side, and top covers. See “Left side cover”

on page 18 throu gh “Top cover” on page 29.

CAUTION Never operate the printer with the laser/scanner assembly exposed.

The reflected beam, although invisible, can damage your eyes. When servicing the printer, replace the top cover before operating the printer.

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

laser/scanner.

3 Disconnect the wire harness cable connector (callout 2) from the

connector assembly and unlace the harness from the cable lance.

Figure 29. Disconnect the laser/scanner harnessing

40 Chapter 2 - Removal and replacement Q1342-90910

4 Release the two shutter-retaining tabs (callout 3) and remove the

shutter and shutter spring.

CAUTION Use care when releasing the shutter-retaining tabs. The tabs are plastic

and can be broken. Only bend the tabs enough to release the shutter lever.

5 Remove the four screws (callout 4) that fasten the scanner to the

printer chassis and remove the laser/scanner.

3443

Figure 30. Remove the laser/scanner CAUTION When replacing the laser/scanner, verify that it is fully seated on the

printer chassis. The laser/scanner can be damaged when the mounting screws are tightened if it is not fully seated.

Hint Insert the spring into the hole on the laser/scanner before you snap the

shutter lever back into place.

Q1342-90910 Internal assemblies 41

Fuser assembly

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17.

z Left side, back, right side, and top covers. See “Left side cover”

on page 18 throu gh “Top cover” on page 29.

2 Remove two screws (callout 1) from the right fuser bracket. 3 Remove a third screw (callout 2) from behind the large gear on

the right fuser plate. Rotate the gear counter clockwise to align a hole in the gear with the screw-head.

4 Remove the bracket.

Figure 31. Remove the right fuser bracket

42 Chapter 2 - Removal and replacement Q1342-90910

5 Remove three screws (callout 3) from the left fuser bracket. 6 Remove the bracket.

Figure 32. Remove the left fuser bracket

Q1342-90910 Internal assemblies 43

7 Remove two screws (one shown in callout 4), one from each side

of the printer (right side shown).

Figure 33. Remove the fuser mounting screws

44 Chapter 2 - Removal and replacement Q1342-90910

8 Unplug the fuser cable connector (callout 5) by pressing and

releasing the clip on the back of the connector.

9 Unplug four smaller cable connectors (callout 6) from the ECU

and remove the harnesses from the fuser harness lance points.

10 Unplug the spade connector (callout 7). 11 Slightly spread the chassis to release the fuser locator pins and

then lift the fuser assembly out of the printer.

Figure 34. Remove the fuser assembly

Q1342-90910 Internal assemblies 45

Output rollers

Face-down delivery assembly

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17.

z Left side, back, right side, and top covers. See “Left side cover”

on page 18 throu gh “Top cover” on page 29.

z Fuser assembly. See “Fuser assembly” on page 42.

2 Remove two screws (callout 1) and lift the face-down delivery

assembly away from the fuser assembly.

Figure 35. Remove the output rollers

46 Chapter 2 - Removal and replacement Q1342-90910

Face-up roller

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17.

z Left side, back, right side, and top covers. See “Left side cover”

on page 18 throu gh “Top cover” on page 29.

z Fuser assembly. See “Fuser assembly” on page 42.

2 Turn the fuser assembly over and remove the gear (callout 1)

from the face-up roller

3 Release the tab (callout 2) on the face-up roller bushing and

rotate the bushing forward until the pin releases. Remove the bushing.

4 Slide the face-up roller toward the gear end until the roller clears

the roller retainer (opposite the gear end), and lift it out of the fuser assembly.

2221

Figure 36. Remove the face-up rollers Note When replacing the face-up roller bushing, verify that the locking pin is

seated correctly to prevent the roller from slipping out of t he roller retainer.

Q1342-90910 Internal assemblies 47

Right plate assembly

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17.

z Left side, back, right side, and top covers. See “Left side cover”

on page 18 throu gh “Top cover” on page 29.

z Unlace the solenoid wire harness. See “Solenoid” on page 27. z Front cover, toner cartridge door, and front guide. See “Front

cover” on page 32 through “Front guide” on page 36.

z Fuser assembly. See “Fuser assembly” on page 42.

2 Lift the small white tab to release the clutch, and slide the clutch

to the left (toward the pickup roller).

Hint Keep the two halves of the clutch gear together to avoid losing the

internal clutch spring.

Figure 37. Remove the gear-clutch assembly

48 Chapter 2 - Removal and replacement Q1342-90910

3 Remove seven mounting screws (callout 2). if the motor is

installed, disconnect the motor wire harness.

4 Apply slight pressure and pull the right plate assembly off of the

printer.

Figure 38. Remove the right plate assembly mounting screws

Q1342-90910 Internal assemblies 49

Pickup assembly

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17.

z Left side, back, right side, and top covers. See “Left side cover”

on page 18 throu gh “Top cover” on page 29.

z Front cover, toner cartridge door, and front guide. See “Front

cover” on page 32 through “Front guide” on page 36.

z Fuser assembly. See “Fuser assembly” on page 42. z Right plate assembly. See “Right plate assembly” on page 48.

2 Remove the side pickup assembly mounting screw (callout 1).

Figure 39. Remove the pickup assembly mounting screw

50 Chapter 2 - Removal and replacement Q1342-90910

3 Remove the two top mounting screws (callout 2).

Figure 40. Remove the top pickup assembly mounting screws

Q1342-90910 Internal assemblies 51

4 Lift the metal shield (callout 3) straight up and remove it from the

printer.

Figure 41. Remove the metal shield

52 Chapter 2 - Removal and replacement Q1342-90910

Pickup roller assembly

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17.

z Left side, back, right side, and top covers. See “Left side cover”

on page 18 throu gh “Top cover” on page 29.

z Front cover, toner cartridge door, and front guide. See “Front

cover” on page 32 through “Front guide” on page 36.

z Fuser assembly. See “Fuser assembly” on page 42. z Right plate assembly, and pickup assembly. See “Right plate

assembly” on page 48 through “Pickup assembly” on page 50.

2 Release the locking tab on the right side pickup roller cam

(callout 1) and slide the cam to the left about one inch.

3 Slide the roller shaft toward the right until the left end releases. 4 Carefully pull the left end of the shaft toward you until it clears the

left side of the chassis. Remove the pickup roller assembly.

Figure 42. Remove the pickup roller assembly

Q1342-90910 Internal assemblies 53

Paper lift plate assembly

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17.

z Left side, back, right side, and top covers. See “Left side cover”

on page 18 throu gh “Top cover” on page 29.

z Front cover, toner cartridge door, and front guide. See “Front

cover” on page 32 through “Front guide” on page 36.

z Fuser assembly. See “Fuser assembly” on page 42. z Right plate assembly and pickup assembly. See “Right plate

assembly” on page 48 through “Pickup assembly” on page 50.

2 Grasp the large plastic tabs (callout 1) on each side of the paper

lift plate and rotate it forward.

CAUTION To avoid damaging them, do not pull on the paper guides.

3 Lift the paper lift plate up and out of the bushings (callout 2).

Figure 43. Remove the paper lift plate assembly Hint When replacing the paper lift plate, verify that the lift plate springs

(callout 3) are fully seated onto the circular spring positioning pedestals.

54 Chapter 2 - Removal and replacement Q1342-90910

Left plate assembly

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17.

z Left side, back, right side, and top covers. See “Left side cover”

on page 18 throu gh “Top cover” on page 29.

z Front cover, toner cartridge door, and front guide. See “Front

cover” on page 32 through “Front guide” on page 36.

z Fuser assembly. See “Fuser assembly” on page 42.

2 Disconnect the laser/scanner ribbon cable (at the laser/scanner

end). Disconnect the laser/scanner wire harness and the ECU ribbon cable from the connector PCB. Remove the laser/scanner harness from the wire clip.

3 Remove the eight mounting screws (callout 1) and lift the left

plate assembly off of the printer.

Figure 44. Remove the left plate assembly

Q1342-90910 Internal assemblies 55

Bottom assemblies

ECU pan

1 Remove the following assemblies:

z Toner cartridge, media tray, and cable pod. See “Toner cartridge”

on page 15 throu gh “Cable pod” on page 17.

z Left side, back, and right side covers. See “Left side cover” on

page 18 through “Right side cover” on page 24.

2 Unplug the three spade connectors (callout 1). 3 Disconnect the motor cable connector (callout 2). 4 Unplug the fuser cable connector (callout 3) by pressing and

releasing the clip on the back of the connector.

5 Unplug the remaining four wire harness connectors (callout 4)

from the ECU.

Figure 45. Disconnect the ECU wire harnesses

56 Chapter 2 - Removal and replacement Q1342-90910

6 Unplug the ribbon cable from the ECU to the connector assembly

PCB (callout 5).

7 Remove two screws (callout 6) on each side of the printer (left

side shown).

216

Figure 46. Remove the ECU mounting screws

Q1342-90910 Bottom assemblies 57

8 Gently pull the two sides of the printer away from the ECU pan to

release the ECU pan.

9 Slide the ECU pan out and away from the printer.

Figure 47. Remove the ECU pan

58 Chapter 2 - Removal and replacement Q1342-90910

10 Remove the motor wire harness from the wire clip (callout 7). 11 Remove the three ECU PCB mounting screws (callout 8). 12 Remove the two power cord receptacle plate mounting

screws (callout 9).

13 Lift the ECU PCB off of the ECU pan.

128

Figure 48. Remove the ECU PCB from the pan Note The ECU board is replaced as a single unit. Only soldered cables ship

with the replacement board. If other cables are damaged during removal, you will have to order replacements.

Q1342-90910 Bottom assemblies 59

Paper-feed assembly

1 Remove the following assemblies:

z Toner cartridge, media tray and formatter pod. See “Toner

cartridge” on page 15 through “Cable pod” on page 17.

z Left side, back, and right side covers. See “Left side cover” on

page 18 through “Right side cover” on page 24.

z Right plate assembly. See “Right plate assembly” on page 48. z ECU pan. See “ECU pan” on page 56.

Note Do not remove the gear shield instead of the right plate assembly. The

gear shield retains some of the gears. Removing the gear shield can cause loose gears and springs to be misplaced.

2 Unwind the optic paper sensor and solenoid cables from the

cable guides (callout 1) on the paper-feed mechanism.

3 If necessary, remove one screw (callout 2) from the paper sensor

PCB assembly and remove the sensor PCB.

4 Remove the two mounting screws (callout 3) from the paper-feed

mechanism.

Figure 49. Remove wire harnesses

60 Chapter 2 - Removal and replacement Q1342-90910

5 Apply slight pressure to disengage the paper-feed assembly

bushings from the roller shaft (callout 4). Lift the paper-feed assembly up and out of the printer.

Figure 50. Remove the paper-feed assembly Hint When replacing the paper feed assembly, insert the two tabs

(callout 5) on the paper-feed assembly into the provided recesses (callout 6) near the roller. Insert the bottom of the sensor flag into the hole in front of the paper-feed roller shaft and verify that the sensor flag moves freely.

Q1342-90910 Bottom assemblies 61

6 Use needle-nose pliers to push the two tabs away from the end of

the paper-feed roller shaft.

7 Pull the paper-feed roller shaft away from the gear end and

remove it.

Figure 51. Release the paper-feed roller

62 Chapter 2 - Removal and replacement Q1342-90910

Troubleshooting

Chapter contents

Basic troubleshooting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

LED status lights. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .67

Checking the toner cartridge . . . . . . . . . . . . . . . . . . . .71

Solving image-quality problems . . . . . . . . . . . . . . . . . . 72

Solving paper-feed problems . . . . . . . . . . . . . . . . . . . . . . . . .77

Functional checks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Engine test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79

Half self-test functional check. . . . . . . . . . . . . . . . . . . .81

Drum rotation functional check. . . . . . . . . . . . . . . . . . . 82

Heating-element check. . . . . . . . . . . . . . . . . . . . . . . . .83

High-voltage power supply check. . . . . . . . . . . . . . . . . 84

Paper-path check . . . . . . . . . . . . . . . . . . . . . . . . . . . . .86

Troubleshooting tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

Repetitive image defect ruler . . . . . . . . . . . . . . . . . . . . 87

Location of ECU Connectors . . . . . . . . . . . . . . . . . . . . 88

Q1342-90910 Chapter contents 63

Basic troubleshooting

Table 7. Basic troubleshooting

# Verification steps Pos sib le problems Sol ution s

Does the printer turn

on successfully?

When the product is connected to a grounded power source, the printer motor should continuously rotate for about six seconds.

Power is not being supplied to the printer. There are open wire harness connectors. There are pinched or frayed wire harness wires. The motor or ECU has failed.

1. Verify that the product is plugged in.

2. Verify that the power cable is functional and the cable is plugged into the correct power source (110 V or 220 V ac).

3. Verify that FU102 (the ECU PCB fuse) on the ECU is not open.

4. Verify that the fuser levers are in the up position.

5. Verify that the printer door is closed.

6. Verify that the motor connector is seated into the ECU.

7. Verify that the motor is correctly mounted on the printer chassis.

8. Check for and replace pinched or frayed wire harness wires.

9. Replace the motor.

10. Replace the ECU.

Do engine tests

print?

Print an engine test. (See page 79.)The engine test should print without paper-feed problems or print-quality problems.

The printed page is filled with evenly spaced horizontal lines (approximately 1 mm apart).

The engine test button is pressed, but nothing happens.

The motor rotates on and off (about 1 second), and then stops (no paper feed).

The motor rotates on, off, on, off in short cycles, and then stops (no paper feed).

The engine-test was successful.

1. The toner cartridge is missing or the toner cartridge door is open. Install a toner cartridge and/or close the door.

2. A faulty toner-cartridge-to-ECU connection exists. Verify that all connectors to the ECU are firmly seated and contacts are clean.

3. A faulty connector-PCB-to-ECU connection exists. Replace the connector assembly.

1. Verify that the laser/scanner connectors are fully seated.

2. Replace the laser/scanner.

1. Verify that the fuser wire connectors are fully seated.

2. Replace the fuser.

64 Chapter 3 - Troubleshooting Q1342-90910

Table 7. Basic troubleshooting (continued)

# Verification steps Pos sib le problems Sol ution s

Do engine tests

print? (continued)

The printer attempts to pick up paper three times and then the motor stops (no paper feed).

The printer attempts to pick up paper three times, and the paper feeds but comes out blank.

The printer attempts to pick up paper three times and the laser/scanner emits a high-pitched whine, but the motor does not turn.

The printed page is filled with evenly spaced horizontal lines, but the toner can be easily smeared.

The engine-test page begins to print, but the page stops just after tripping the output sensor flag.

1. The media tray is empty. Place media in the tray.

2. The printer is dirty. Clean the printer.

3. Replace the pickup roller.

4. Replace the paper pickup assembly

1. the paper-feed assembly connections are faulty. Verify that the all paper-feed assembly connectors to the ECU are firmly seated.

2. Replace the paper-feed assembly.

1. Verify that the motor connector is firmly seated.

2. Replace the motor

1. Make sure that the media meets specifications detailed in the Print Media Guide for the HP LaserJet printer family.

2. A faulty fuser assembly power connection exists. Verify that the fuser power connectors are firmly seated.

3. Replace the fuser.

1. Verify that the output sensor (on the back of the fuser) connector is firmly seated at the ECU end.

2. Replace the output sensor

Hint When you attempt to troubleshoot engine-test page problems, it

might be necessary to unplug the printer from the power source (power off), and then plug it back into the power source (power on) before printing a subsequent engine-test page. Verify that the printer was successfully turned on (see verification step 1).

3 The printer motor

rotates for about six seconds and stops, but the LED status R light does not illuminate.

When the printer is successfully turned on, the green Ready status light is illuminated and the printer is ready to process a job.

EADY

Wire harness connectors are open. Harness wires are pinched or frayed. The cable pod, connector assembly, or LED status panel has failed.

1. Verify that the LED status panel connector to the connector assembly is firmly seated.

2. Verify that the connector-assembly-toECU flat ribbon cable is firmly seated (at the connector assembly end).

3. Replace the cable pod

4. Replace the connector PCB assembly

5. Replace the LED status light panel.

Note The LED lights will not operate if the cable pod is not connected to

the printer.

Q1342-90910 Basic troubleshooting 65

Table 7. Basic troubleshooting (continued)

# Verification steps Pos sib le problems Sol ution s

Is the software

installed correctly?

The software is not installed, or an error occurred during software installation.

Uninstall and then reinstall the product software. Make sure you use the correct installation procedure and the correct port setting.

Does the product

print from the computer?

Connect the cable pod to the printer and the USB cable to the computer. Use a word-processing application to send a print job to the printer.

Is the printed image

of poor quality?

Does the media jam

in the printer paper path?

The cable is not connected correctly.

An incorrect printer driver is selected.

Other devices are connected to the USB port.

A USB port driver problem exists.

The cable pod has failed. Replace the cable pod. Various print image-

quality problems.

Various printer paperpath problems.

Reconnect the cable.

Select the correct printer driver.

Disconnect the other devices and try again to print.

1. Reset the computer BIOS USB settings. See the computer user guide for instructions.

2. Try a different USB port.

1. Make sure that the media meets specifications detailed in the Print Media Guide for the HP LaserJet printer family.

2. Identify the image quality problem. See “Solving image-quality problems” on page 72.

Isolate the printer paper-path problem. See “Paper-path check” on page 86.

66 Chapter 3 - Troubleshooting Q1342-90910

Errors

LED status lights

The status lights give the user information about the status of the printer. Until the cable pod initializes the firmware, only the ready and fatal-error light patterns can appear. If the cable pod is not connected when the printer power is turned on, the motor rotates (for about 6 seconds) but the status lights remain off (the firmware is not initialized). If the cable pod is connected while printer power is on, the printer turns off and then on, the motor rotates (for about 6 seconds) and the cable pod initializes the firmware.

Ready

light

(green)

Attention

light

(amber)

Figure 52. LED status lights location

Table 8. LED status lights legend

Light symbol Meaning of symbol

Light off

Light on

Light blinking

Q1342-90910 Errors 67

Table 9. Status lights messages

Message Possible causes Solutions

The Ready and Attention lights are not illuminated.

The Ready and Attention lights blink. The cable pod is initializing the firmware or the unit is printing a cleaning page.

1. Verify that the power cord is connected to the printer and the power is turned on.

2. The cable pod is not connected or has failed. Verify that the cable pod is connected and fully seated.

3. Replace the cable pod.

4. Replace the LED status panel assembly.

No action is needed.

The Ready light illuminates. The printer is ready to print.

The Ready light blinks. The printer is receiving and processing data.

The Attention light blinks. The printer requires user intervention.

The Ready light illuminates and the Attention light blinks. The printer is in a continuable error state.

No action is needed. The Ready light indicates that the cable pod has initialized the firmware. The firmware is initialized each time the printer power is turned on or when the cable pod is connected to the printer (with the printer power turned on).

Wait for the job to print.

A User Intervention message appears on the computer screen. Follow the directions in the message to clear the error. Possible errors requiring user intervention are:

z Out of paper z Media jam z Toner door open z Toner cartridge missing

A User Intervention message appears on the computer screen. Follow the directions in this message to clear the error. "Out of memory" is the continuable error.

68 Chapter 3 - Troubleshooting Q1342-90910

Table 9. Status lights messages (continued)

Message Possible causes Solutions

The Ready and Attention lights are illuminated. The printer is in a fatal error state.

A fatal error message appears on the computer screen. Follow the directions in the message to clear the error. Possible fatal errors are:

z Fuser error z Laser/scanner error z ECU communication error z Formatter RAM or ROM error z Scan buffer error z Dynamic RAM controller error z General fatal error z Miscellaneous hardware error

Note The cable pod downloads the firmware from the computer each time

you turn on the printer. If the cable pod does not receive the firmware download from the computer, only the ready and fatal-error light patterns can appear.

Hint The status lights can only display information about one printer state

at a time. The status lights display printer status information in the following order: fatal errors, intervention-required error, continuable error, and processing job.

Q1342-90910 Errors 69

Additional error messages

Error conditions can exist that do not generate status light patterns. Instead, an error message appears on the computer screen.

Table 10. Error messages (no LED status panel pattern)

Message Solutions

Printer not responding

Cannot access port (in use by another application)

Illegal operation/ General protection fault/Spool 32 error

Hint To help prevent the "Illegal operation/General protection fault/Spool 32

1. Verify that the power cord is connected to the printer and the power is turned on (the Ready light should be illuminated).

2. Disconnect the cable pod cable from the printer and the computer. Reconnect the cable pod cable at both ends.

3. Close all software applications and restart the computer.

1. Close all software applications and reboot the computer.

2. Try running only one software application at a time.

A computer system resource error (memory or hard-disk error) occurred in Windows. Reboot the computer.

error," try running fewer software programs at the same time. Close programs rather than minimizing them. Screen savers, virus checkers, fax software, and other memory-resident applications might be using computer resources needed by the printer.

When attempting to print, avoid memory-intensive tasks like sending a fax or using multi-media programs.

Delete all temp (file_name.tmp) files from Temp subdirectories, such as C:\Windows\Temp.

Try printing at a lower resolution (especially if your print job contains complex graphics).

70 Chapter 3 - Troubleshooting Q1342-90910

Checking the toner cartridge

Image formation defects are many times the result of problems in the toner cartridge. If there is any doubt, always replace the toner cartridge before troubleshooting image defects.

Use the following checklist to make sure that the toner cartridge is still operable.

V Verify that the toner cartridge is seated properly. V Verify that the cartridge has toner in it (see the hint below). V Check the expiration date stamped on the toner cartridge box. V Check the toner cartridge to see if it has been disassembled or

refilled.

V Inspect the toner cartridge to see if toner is leaking through worn

seals.

V Check the surface of the photosensitive drum in the cartridge to

see if it has been damaged or scratched. Do not touch the drum. Skin oils transferred to the drum by touching it contaminate the photosensitive surface and can cause spotting and image defects.

V Blurred areas on printed pages indicate that the photosensitive

drum in the cartridge has been overexp os ed to light. Overexposure to light cause s perma nen t damage to the photosensitive drum. The toner cartridge should be replaced.

Hint Weigh the toner cartridge to approximate how much toner is left in it.

A toner cartridge weighs approximately 746 grams (30.5 oz) when it is full, approximately 630 grams (27.0 oz) when the print first fades, and approximately 617 grams (26.2 oz) when the cartridge is empty.

To redistribute toner in the cartridge

Before installing a new cartridge or when toner is low in the installed cartridge, redistribute the toner by rotating the cartridge back and forth five or six times.

Q1342-90910 Errors 71

Solving image-quality problems

Use the following tables to help solve problems with printed pages. If the problem occurs when printing, see table 11, “Solving print

image-quality problems,” on page 72. Also, see table 12, “Solving paper-feed problems,” on page 77.

Solving print image-quality problems

Table 11. Solving print image-quality problems

Problem Cause Solution

Pages do not print.

Parts of the page around the edges are not printing.

The printer is not plugged in. Make sure that the printer is plugged into

The cable pod cable is loose. Check that the cable between the printer

The paper feed assembly is not functioning or incorrectly installed.

The tape was not removed from the toner cartridge.

The toner cartridge is out of toner. Replace the toner cartridge. (See “Toner

The media you are using does not meet HP’s specifications (for example, it is too moist or too rough).

The printer cannot print to the edge of the paper. The printer has minimum margins on each edge of 4.23 mm (0.167 inch).

The reduction setting is set incorrectly. Check the reduction setting in the “Print”

a live wall outlet or power strip. The Ready light illuminates when the printer is ready to print.

and the computer is securely connected at both ends.

Verify that the pickup assembly, pickup roller, and paper lift plate assembly are installed correctly and working properly.

Remove the toner cartridge, remove the tape, and reinstalling the toner cartridge. See “Toner cartridge” on page 15.

cartridge” on page 15.) Make sure that the media meets

specifications detailed in the Print Media Guide for the HP LaserJet printer family.

To get the image to fit into this printable area, slightly reduce the size of the image.

or “Setup” window from within the program you are using.

72 Chapter 3 - Troubleshooting Q1342-90910

Table 11. Solving print image-quality problems (continued)

Problem Cause Solution

Toner specks appear on the printed page. .

The media you are using does not meet HP’s specifications (for example, it is too moist or too rough).

The printer needs to be cleaned. Clean the printer. See the

Make sure that the media meets specifications detailed in the Print Media Guide for the HP LaserJet printer family.

HP LaserJet 1000 Series user guide.

Characters are only partially printed (also referred to as dropouts).

Vertical lines appear on the printed page.

A single sheet of paper is defective. Try reprinting the job. The print density needs to be adjusted. Adjust the print density from the device

The moisture content of the paper is inconsistent, or the paper has moist or wet spots on the surface.

The paper was damaged by inconsistent manufacturing processes.

A draft mode or EconoMode is selected in the software.

The toner cartridge is defective. Replace the toner cartridge. See “Toner

The photosensitive drum inside the toner cartridge is scratched.

The fuser is damaged or has an obstruction.

configuration utility. Make sure that the media meets

specifications, detailed in the Print Media Guide for the HP LaserJet printer family.

Make sure that the media meets specifications detailed in the Print Media Guide for the HP LaserJet printer family.

Clear the printer software EconoMode check box.

cartridge” on page 15. Replace the toner cartridge. See “Toner

cartridge” on page 15. Replace the fuser. See “Fuser assembly”

on page 42.

Q1342-90910 Errors 73

Table 11. Solving print image-quality problems (continued)

Problem Cause Solution

The printed page has a gray background.

The print density setting is set too heavy. Decrease the amount of background

shading through the device configuration

utility. The media basis weight is too heavy. Change the media to a light basis weight. The humidity level is too low. Very low humidity can increase the

amount of background shading. Move

the printer to a different location, or

decrease the background shading

through the device configuration utility. The toner cartridge needs to be

replaced.

Replace the toner cartridge. See “Toner

cartridge” on page 15.

Toner smears appear on the printed page.

The toner is loose, and it does not stay attached to the printed page.

If the toner smears appear on the leading edge of the media, the media guides are dirty.

The media you are using does not meet HP’s specifications (for example, it is too moist or too rough).

The toner cartridge needs to be replaced.

The fuser temperature is too low. Select Optimize for: in the Paper tab of

The inside of the printer is dirty. Clean the printer. See your

The media you are using does not meet HP’s specifications (for example, it is too moist or too rough).

The toner cartridge needs to be replaced.

The high voltage contacts are dirty or damaged.

The high voltage contacts are are not in proper contact with the toner cartridge.

The printer driver is not set for the correct media.

The power strip is not working correctly. Plug the printer directly into an ac outlet.

Wipe the media guides with a dry, lint-

free cloth.

Make sure that the media meets

specifications detailed in the Print Media

Guide for the HP LaserJet printer family.

Replace the toner cartridge.

the printer driver. Make sure that it is set

for the appropriate media.

HP LaserJet 1000 Series user guide.

Make sure that the media meets

specifications detailed in the Print Media

Guide for the HP LaserJet printer family.

Replace the toner cartridge.

See see “High-voltage power supply

check” on page 84.

Verify the high voltage contacts are

installed correctly and are properly

contacting the toner cartridge.

1. Select Optimize for: in the Paper tab

of the printer driver. Select the correct

media.

2. Select the correct media through the

device configuration utility.

74 Chapter 3 - Troubleshooting Q1342-90910

Table 11. Solving print image-quality problems (continued)

Problem Cause Solution

Repetitive vertical defects appear on the printed page.

Characters are misformed and are producing hollow images.

If the repetitive mark occurs at equal distance between occurrences, either the toner cartridge or a printer roller is damaged.

The internal parts have toner on them. If the defects occur on the back of the

The printer driver is not set for the correct media.

The media is too slick. Try a different media. Make sure that the

The printer driver is not set for the correct media.

Use the defect ruler to identify the

spacing. Check the appropriate

component and replace if necessary.

(see “Repetitive image defect ruler” on

page 87.)

page, the problem will probably correct

itself after a few more printed pages.

Otherwise, clean the printer. See your

HP LaserJet 1000 Series user guide.

1. Select Optimize for: in the Paper tab

of the printer driver. Select the correct

media. (This affects the current print job

only.)

2. Select the correct media through the

device configuration utility.

media meets specifications detailed in

the Print Media Guide for the

HP LaserJet printer family.

1. Select Optimize for: in the Paper tab

of the printer driver. Select the correct

media. (This affects the current print job

only.)

2. Select the correct media through the

device configuration utility.

Pages are skewed.

Q1342-90910 Errors 75

The media is loaded incorrectly. Reload the media, and make sure that

The input tray is too full. Remove some of the sheets. The input

The type and quality of media you are using does not meet HP’s specifications.

the media guides are not adjusted too

tightly in or too loosely against the media

stack.

tray can hold up to 250 sheets of 20-lb

(75-g/m

heavier paper) or from 20 to 30

envelopes.

Make sure that the media meets

specifications detailed in the Print Media

Guide for the HP LaserJet printer family.

) bond weight paper (less for

Table 11. Solving print image-quality problems (continued)

Problem Cause Solution

The printed page has curls or waves.

Large amounts of toner are scattered around the characters.

The environment is too warm or too humid.

The media was in the input tray too long. Turn the stack of media over and put it

The standard paper path is not working correctly.

The fuser temperature is too high. Select Optimize for: in the Paper tab of

The media is resisting the toner. 1. Use a different media. Make sure that

1. Both high temperatures and high

humidity levels cause media to curl.

Move the printer to a different

environment.

2. Use a different media. Make sure that

the media meets specifications detailed

in the Print Media Guide for the

HP LaserJet printer family.

back in the tray.

Rotate the media 180° and put it back in

the tray.

Open the straight-through output door on

the back of the printer and use this paper

path.

the printer driver. Make sure that it is set

for the appropriate media.

the media meets specifications detailed

in the Print Media Guide for the

HP LaserJet printer family.

2. Turn the stack of media over and put it

back in the tray.

3. Use media that is designed for laser

printers.

76 Chapter 3 - Troubleshooting Q1342-90910

Solving paper-feed problems

Use the following tables to solve problems related to moving print media or documents through the printer.

Table 12. Solving paper-feed problems

Problem Cause Solution

Pages are coming out curled or wrinkled.

Print is misaligned on the page (skewed pages).

Paper curl is inherent to the laser printing processes, and occurs when paper is subjected to heat. Paper curl tends to relax as the paper cools while resting on a flat surface.

Paper is curled or wrinkled when using the paper output bin.

Paper is not stored properly. Whenever possible, store paper in its

The fuser temperature is too high. Select Optimize for: in the Paper tab of

The input tray is overfilled. Remove some of the media. The media guides are not set correctly,

are broken, or are missing.

The media weight or surface finish does not meet HP’s specifications.

Make sure that the media meets specifications detailed in the Print Media Guide for the HP LaserJet printer family.

Open the straight-through output door on the back of the printer and use this paper path. Reset the fuser mode to the default.

sealed ream at room temperature.

the printer driver. Make sure that it is set for the appropriate media.

Be sure to center the media by using the side media guides. Verify that the guides are not adjusted too tightly or too loosely against the media stack. Check for broken or missing guides and replace as necessary.

Make sure that the media meets specifications detailed in the Print Media Guide for the HP LaserJet printer family.

Q1342-90910 Solving paper-feed problems 77

Table 12. Solving paper-feed problems (continued)

Problem Cause Solution

The printer feeds multiple sheets or jams frequently from the input tray.

Paper guides are not adjusted properly. Slide the guides against the sides of the

stack in the input tray to center the paper. Make sure the guides are not adjusted too tightly or to loosely against the media stack.

Paper was not removed from the input tray before refilling the tray.

Always remove paper from the input tray before refilling it.

The input tray is overfilled. Remove some of the sheets. The input

The paper was poorly cut by the manufacturer and is sticking together.

The paper does not meet HP’s specifications for print media.

The output capacity was exceeded in the paper output bin.

The pickup roller is dirty. Clean the pickup roller. See your

The pickup roller is damaged. Replace the pickup roller. See “Pickup

The separation pad is dirty. Clean the separation pad. See your

The separation pad is damaged or not installed correctly.

The separation pad is not installed correctly.

A sensor is not operating properly. Check the sensors to make sure that

tray can hold up to 250 sheets of 20-lb

(75-g/m heavier paper) or from 20 to 30 envelopes.

“Break” the ream of paper by curving it into an upside-down u-shape; this can effectively decrease multifeeds. Also try turning the paper around to feed the opposite end first, or use a different type of paper.

Make sure that the media meets specifications detailed in the Print Media Guide for the HP LaserJet printer family.

Do not allow more than 125 sheets of 20-lb (75-g/m for heavier paper) to fill the paper output bin.

HP LaserJet 1000 Series user guide.

roller assembly” on page 53.

HP LaserJet 1000 Series user guide. Replace or reinstall the separation pad.

See your HP LaserJet 1000 Series user guide.

Reinstall the separation pad. See your HP LaserJet 1000 Series user guide.

none of them are jammed. If a sensor cannot be adjusted to properly operate, replace the sensor.

) bond weight paper (less for

) bond-weight paper (less

78 Chapter 3 - Troubleshooting Q1342-90910

Functional checks

Engine test

The engine test is used to verify that the print engine is functioning correctly. The cable pod is bypassed during an engine test, so the engine test is useful for isolating printer problems. The engine test prints horizontal lines in the printable area of a page. This page is also useful for checking and adjusting registration.

Printing an engine test

The engine test switch is below the cable pod connector assembly. To print an engine-test page, depress the engine-test button

(callout 1). A single test page prints (see “Engine test troubleshooting” on page 80).

Figure 53. Engine-test button

Q1342-90910 Functional checks 79

Table 13. Engine test troubleshooting

Problem Cause Solution

Engine test print page is filled with evenly spaced horizontal lines.

No engine test page prints.

Print page comes out curled or wrinkled.

Print is misaligned on the page (skewed pages).

Successful engine test. No action required.

Various possible causes. See “Basic troubleshooting” on page 64,

Paper curl is inherent to the laser printing processes, and occurs when paper is subjected to heat. Paper curl tends to relax as the paper cools while resting on a flat surface.

Paper is curled or wrinkled when using the paper output bin.

Paper is not stored properly. Whenever possible, store paper in its

The fuser temperature is too high. Select Optimize for: in the Paper tab of

The input tray is overfilled. Remove some of the media. The paper guides are not set correctly,

are broken, or are missing.

The media weight or surface finish does not meet HP’s specifications.

item 2. Make sure that the media meets

specifications detailed in the Print Media Guide for the HP LaserJet printer family.

Open the straight-through output door on the back of the printer and use this paper path. Reset the fuser mode to the default.

sealed ream at room temperature.

the printer driver (software). Make sure that it is set for the appropriate media.

Be sure to center the paper with the side media guides. Verify that the guides are not adjusted too tightly or too loosely against the media stack. Check for broken or missing guides and replace as necessary.

Make sure that the media meets specifications detailed in the Print Media Guide for the HP LaserJet printer family.

80 Chapter 3 - Troubleshooting Q1342-90910

Half self-test functional check

The electrophotographic process can be subdivided into the following stages:

z Image formation stage (charges the drum and writes a latent

image to the drum with the laser)

z Development stage (forms a toner image on the drum) z Transfer stage (transfers the image to paper) z Cleaning stage (removes excess toner from the drum) z Fusing stage (applies heat and pressure to make the image on

paper permanent)

To perform a half self-test check

The purpose of the half self-test check is to determine which process is malfunctioning.

1 Print a engine test page. 2 Open the printer door after the paper advances half-way through

the printer (about five seconds after the motor begins rotation). The leading edge of the paper should have advanced past the toner cartridge.

3 Remove the toner cartridge. 4 Open the toner cartridge drum shield to view the drum surface. If

a dark and distinct toner image is present on the drum surface, assume that the first two functions of the electrophotographic process are functioning (image formation and development). Troubleshoot the failure as a transfer or fusing problem.

To perform other checks

If no image appears on the photosensitive drum, perform these checks:

1 Make sure you removed the entire length of the sealing tape from

the toner cartridge before you installed the cartridge.

2 Perform a drum rotation functional check. See “Drum rotation

functional check” on page 82.

3 Perform a high-voltage power supply check. See “High-voltage

power supply check” on page 84.

Q1342-90910 Functional checks 81

Drum rotation functional check

The photosensitive drum, located in the toner cartridge, must rotate for the print process to work. The photosensitive drum receives its drive from the main drive assembly.

Hint This test is especially important if refilled toner cartridges have been

used.

1 Open the printer door. 2 Remove the toner cartridge. 3 Mark the drive gear on the cartridge with a felt-tipped marker.

Note the position of the mark.

4 Install the toner cartridge and close the printer door. The start-up

sequence should rotate the drum enough to move the mark.

5 Open the printer and inspect the gear that was marked in step 3.

Verify that the mark moved.

If the mark did not move, inspect the main drive assembly to make sure that it is meshing with the toner cartridge gears. If the drive gears appear functional and the drum does not move, replace the toner cartridge.

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Heating-element check

Paper passes between the heating element and a soft pressure roller to fuse toner to the paper.

1 Unplug the printer for at least ten minutes. 2 Remove the heating element connector (callout 1) from the ECU.

To measure the continuity of the heating element, measure the resistance between the two pins at the end of the cable.

Note Normal resistance is 25 ohms +/- 10 ohms for the 110 V printer and 80

ohms +/- 20 ohms for the 220 V printer. If no resistance is measured, replace the fuser.

3 Remove the thermistor connector (callout 2), and measure the

resistance between J206 pins one and two and between J206 pins three and four.

Note Normal resistance between both pairs of pins is 370 K ohms +/- 50 K

ohms at 20° C (68° F).

4 If no resistance is measured, replace the fuser. 5 Reconnect the heating element and thermistor. Verify that the

connectors are seated into both the printer chassis and the ECU.

212

Figure 54. Locate the connectors for the heating element check

Q1342-90910 Functional checks 83

High-voltage power supply check

The high-voltage power supply PCA provides the necessary voltages for the electrophotographic processes.

To check the toner cartridge connection points

Turn the toner cartridge over and visually inspect the three connection points on the ends of the toner cartridge: drum ground (callout 1), charging (callout 2), and developing roller (callout 3). If any are dirty or corroded, clean the connection. If any are damaged, replace the toner cartridge.

Note Use only isopropyl alcohol to clean the connections.

Figure 55. Toner cartridge high-voltage connection points (right side)

223

Figure 56. Toner cartridge high-voltage connection points (left side)

84 Chapter 3 - Troubleshooting Q1342-90910

To check the high-voltage connector assembly

The assembly uses three spring-loaded pins to contact the toner cartridge: drum ground (callout 1), charging (callout 2), and developing roller (callout 3). Verify that the pins are not dirty or corroded and that the spring-loading action is functional. If any of the pins are dirty, clean them using isopropyl alcohol only. If any are damaged, replace the high-voltage connector assembly.

Figure 57. High-voltage connector assembly (right side)

232

Figure 58. High-voltage connector assembly (left side)

Q1342-90910 Functional checks 85

Paper-path check

If paper is not being picked up or is not moving through the paper path, you might want to observe all of the paper motion activities. Overriding the door interlock (SW301) allows you to observe:

z motor rotation. z solenoid action. z kick plate motion. z paper pickup roller motion. z drive roller, transfer roller, fuser roller and gear, and delivery roller

motion.

To override SW301

Figure 59. Override SW301

1 Remove the left side cover. (See “Left side cover” on page 18.)

Disconnect the door swing arms.

2 Install the toner cartridge, which will press SW301. 3 Press the laser/scanner interlock switch (callout 1) on the laser/

scanner.

4 While SW301 and the laser/scanner interlock are engaged,

perform an engine test to observe paper motion. See “Engine test” on page 79.

86 Chapter 3 - Troubleshooting Q1342-90910

Troubleshooting tools

Repetitive image defect ruler

First occurrence of print defect

Toner/developing cylinder (37.7 mm, 1.5 in.) Toner/primary chargi ng rolle r (37.7 mm, 1.5 in.)

Transfer roller (45.2 mm, 1.8 in.)

Heating element (56.5 mm, 2.2 in.)

Pressure roller (62.8 mm, 2.5 in.)

Toner/drum (75.4 mm, 3.0 in.)

Figure 60. Repetitive image defec t ruler

Q1342-90910 Troubleshooting tools 87

Location of ECU Connectors

J203

Figure 61. HP LaserJet 1000 ECU PCB

Table 14. ECU connectors

Ref. Description Remarks

SW301 Door-open detection switch Microswitch J301 Toner cartridge high-voltage connector Connection to developing cylinder J304 Toner cartridge high-voltage connector Connection to primary charging

J305 Formater connector Spade connector (black wire) J210 Output sensor 3-pin connector J211 Paper feed sensor 3-pin connector J206 Fuser assembly I/F 4-pin connector J203 Solenoid 2-pin connector INL 101 Power cord see “Accessories” on page 93. J102 Fuser assembly power 3-pin connector FH101

FH102 J401 Motor Harness is soldered to the PCB.

ECU PCB fuse

roller

Use only the same type and rating when replacing the ECU PCB fuse.

88 Chapter 3 - Troubleshooting Q1342-90910

HP LaserJet 1000 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Contents

Figures

Tables

1Product information

Chapter contents

Introduction

Printer features

Product specifications

Identification

Specification tables

Overview of printer

Front and side view

Back and side view

Warranty statement

Extended warranty

Toner cartridge information

Chapter contents

Removal and replacement strategy

Required tools

Before performing service

Parts removal order

Toner cartridge

External assemblies

Media tray

Cable pod

Left side cover

Back cover

ECU PCB fuse

Output sensor

Motor

Right side cover

Solenoid

Top cover

Connector PCB Assembly

LED status panel

Front cover

Toner cartridge door

Front guide

Internal assemblies

Transfer roller

Laser/scanner assembly

Fuser assembly

Output rollers

Right plate assembly

Pickup assembly

Pickup roller assembly

Paper lift plate assembly

Left plate assembly

Bottom assemblies

ECU pan

Paper-feed assembly

Troubleshooting

Chapter contents

Basic troubleshooting

Errors

LED status lights

Additional error messages

Checking the toner cartridge

Solving image-quality problems

Solving paper-feed problems

Functional checks

Engine test

Half self-test functional check

Heating-element check

High-voltage power supply check

Paper-path check

Troubleshooting tools

Repetitive image defect ruler

Location of ECU Connectors