HP K850 Series User Manual Page 68
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- Table of contents
- TROUBLESHOOTING
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Maintaining the printheads
If printed characters are incomplete, or dots or lines are missing from printouts, this might be caused
by clogged ink nozzles and you might need to clean the printheads. To find out which printheads
work with your printer, see
HP supplies and accessories.
When the quality of printouts deteriorates, complete the following:
●
Check the health of the printheads. See
To check printhead health.
●
Align the printheads. See
To align the printheads.
●
Initiate the automatic printhead cleaning process. See
To clean printheads automatically.
●
Manually clean the printhead contacts. See
To clean the printhead contacts manually.
●
Replace the printheads, if the problems persist after cleaning. See
Replacing the printheads.
CAUTION HP is not responsible for damage to the printer that results from modifying the
printheads.
To check printhead health
Use the following means to check the printhead health. If the status of any printhead is bad, clean or
replace the printhead.
Toolbox (Windows)
Open the Toolbox. Click the Information tab, and then click Printhead Health.
Embedded Web server
Open the embedded Web server. Click the Information tab, and then click Ink Supplies in the left
pane.
Configuration page
From the control panel, print a printer configuration page by holding down
(Power button),
pressing
(Cancel button) once, and then releasing the Power button.
Check the message in the Printhead health line of the Printhead Status section of the configuration
page. See
Understanding and printing the configuration page.
To align the printheads
Whenever you replace a printhead, the printer automatically aligns the printheads to ensure the best
print quality. However, if the appearance of your printed pages indicates that the printheads are
misaligned, you can align them manually.
Printer driver
● In Windows 2000 or XP, click the Services tab, click Service this device , and then follow the
onscreen instructions.
●
In Windows 98, click the Services tab, click Align Printheads, and then follow the onscreen
instructions.
60 Chapter 5 Maintaining and troubleshooting ENWW
- HP Officejet Pro K850 Series 1
- User Guide 3
- Table of contents 5
- 1 Getting started 9
- Accessibility 12
- Front view 13
- Control panel 13
- Back view 14
- Rear manual feed slot 15
- Installing other software 16
- Installing accessories 17
- Selecting print media 20
- Transparencies 21
- Custom-size media 21
- Supported media sizes 21
- ENWW Selecting print media 15 23
- Supported media types 25
- ENWW Selecting print media 19 27
- Setting minimum margins 28
- Loading media 29
- Loading small media 31
- Changing print settings 33
- Canceling a print job 34
- Guidelines for duplexing 38
- Duplexing (Windows) 38
- Duplexing (Mac OS) 39
- Managing the printer 42
- Monitor the printer 43
- Administer the printer 44
- Configure network options 45
- Toolbox (Windows) 46
- HP Printer Utility (Mac OS) 47
- Embedded Web server (EWS) 48
- HP Web Jetadmin software 49
- HP Instant Support 50
- Network configuration page 54
- Printing a configuration page 55
- Direct connection 56
- Network connection 58
- Replacing the ink cartridges 66
- Maintaining the printheads 68
- Replacing the printheads 74
- Diagnosing the print quality 79
- Testing the paper feed 80
- Testing media skew 81
- Calibrating the color 82
- Troubleshooting 83
- Resolving printing problems 84
- Blank page printed 85
- Wrong colors are printing 90
- Resolving paper-feed problems 91
- Problems installing software 93
- Clearing jams 94
- To avoid jams 96
- 6 HP supplies and accessories 99
- To order printing supplies 100
- Accessories 101
- Supplies 102
- 7 Support and warranty 103
- Obtaining electronic support 104
- Before you call 105
- HP Total Care phone numbers 105
- 8 Printer lights reference 113
- ENWW 107 115
- ENWW 109 117
- 9 Printer specifications 119
- Physical specifications 120
- Functional specifications 126
- Environmental specifications 128
- Electrical specifications 129
- Regulatory information 131
- FCC statement 132
- EMI statement (Korea) 133
- VCCI statement (Japan) 134
- Regulatory model number 135
- Power cord statement 136
- Declaration of conformity 137
- Reduction and elimination 138
- Power consumption 138
- Material safety data sheets 138
- Recycling 139
- 140 Index ENWW 148
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