HP LaserJet Enterprise M551n User Manual

							4.Remove the new print cartridge from its
protective bag.  
5.
Grasp both sides of the print cartridge and
distribute the toner by gently rocking the print
cartridge.  
6.
Remove the orange protective cover from the
print cartridge.
CAUTION: Avoid prolonged exposure to
light.
CAUTION: Do not touch the green roller.
Doing so can damage the cartridge.  
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							7.Align the print cartridge with its slot and insert
the print cartridge until it clicks into place.  
8.
Close the front door.  
Replace the toner collection unit
Replace the toner collection unit when the control panel prompts you.
NOTE: The toner collection unit is designed for a si ngle use. Do not attempt to empty the toner
collection unit and reuse it. Doing so could lead to  toner being spilled inside the product, which could
result in reduced print quality. After use, return th e toner collection unit to HP’s Planet Partners program
for recycling.
NOTE: If printing documents that require heavy tone r coverage, the toner collection unit can fill
quickly. If printing these types of documents, HP  recommends that you have another toner collection unit
available.
1. Open the front door. Make sure that the door
is completely open.  
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							2.Grasp the blue label at the top of the toner
collection unit and remove it from the product.  
3.
Place the attached blue cap over the blue
opening at the top of the unit.  
4.
Remove the new toner collection unit from its
packaging.  
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							5.Insert the bottom of the new unit into the
product first and then push the top of the unit
until it clicks into place.  
6.
Close the front door.
NOTE: If the toner collection unit is not
installed correctly, the front door does not
close completely.  
To recycle the used toner collection unit, follow the instructions included with the new toner collection
unit.
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							Solve problems with supplies
Check the print cartridges
Check the print cartridge, and replace it if necessary, if you are having any of the following problems:
● The printing is too light or seems faded in areas.
● Printed pages have small unprinted areas.
● Printed pages have streaks or bands.
If you determine that you need to replace a print ca rtridge, print the supplies status page to find the
part number for the correct genuine HP print cartridge.
Type of print cartridge Steps to resolve the problem
Refilled or remanufactured print
cartridge Hewlett-Packard Company cannot recommend the use of non-HP supplies, either
new or remanufactured. Because they are not HP products, HP cannot influence
their design or control their quality. If you are using a refilled or remanufactured
print cartridge and are not satisfied with the print quality, replace the cartridge with
a genuine HP cartridge.
Genuine HP print cartridge 1.The product control panel or the supplies status page indicates  Very Low
status when the cartridge has reached the end of its designated life. Replace
the print cartridge if print quality is no longer acceptable.
2. Visually inspect the print cartridge for damage. See the instructions that follow.
Replace the print cartridge if necessary.
3. If printed pages have marks that repeat several times at the same distance
apart, print a cleaning page. If this does not solve the problem, use the
repeating defects information in this document to identify the cause of the
problem.
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							Inspect the print cartridge for damage
1.Check if the memory chip is damaged or missing.
2.Examine the surface of the green imaging  drum on the top of the print cartridge.
CAUTION:Do not touch the green roller (imaging drum) on the top of the cartridge.
Fingerprints on the imaging drum can cause print-quality problems.
3. If you see any scratches, fingerprints, or other damage on the imaging drum, replace the print
cartridge.
4. If the imaging drum does not appear to be damaged, reinstall the print cartridge. Print a few
pages to see if the problem has resolved.
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							Repeating defects
If defects repeat at regular intervals on the page, use a ruler and the table below to identify the cause
of the defect. Place the top of the ruler at the first  defect. The marking that is beside the next occurrence
of the defect indicates which component needs to be replaced.
Distance between defects Product components that cause the defect
27 mm Print cartridge (primary charging roller)
32 mm Print cartridge (developer roller)
44 mm Print engine (primary transfer roller)
49 mm Print cartridge (replenishing/supply roller)
50 mm Print engine (secondary transfer roller)
76 mm Print cartridge (OPC)
77 mm Fuser (fuser film)
78 mm Fuser (pressure roller)
Print the Supplies Status page
The Print Supplies Status  page indicates the estimated life remaining in print cartridges. It also lists
the part number for the correct genuine HP print cartridge for your product so you can order a
replacement print cartridge, as  well as other useful information.
1. At the control panel, press the Home 
 button.
2. Open the following menus:
●Administration
● Reports
● Configuration/Status Pages
3. Use the down arrow button 
 to highlight the  Supplies Status Page  item, and then press the
OK  button to select it.
4. Use the up arrow button 
 to highlight the  Print item, and then press the  OK button.
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							Interpret control panel messages for supplies
The following table contains important information about supplies status messages.
10.XX.YY Supply memory error
Description
The product cannot read or write to at least one print-cartridge memory chip or a memory chip is
missing from a print cartridge.
Memory chip memory errors ◦YY = 00
◦ XX = 00 - Black
◦ XX = 01 - Cyan
◦ XX = 02 - Magenta
◦ XX = 03 - Yellow
Memory chip missing errors ◦YY = 10
◦ XX = 00 - Black
◦ XX = 01 - Cyan
◦ XX = 02 - Magenta
◦ XX = 03 - Yellow
Recommended action
Reinstall the print cartridge, or install a new print cartridge.
Black cartridge low
Description
The print cartridge is nearing the estimated end of its useful life.
Recommended action
The product indicates when the print-cartridge level is  low. The actual print-cartridge life remaining can
vary. Consider having a replacement cartridge avail able to install when the print quality is no longer
acceptable. The print cartridge does not need to be replaced now.
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							Black cartridge very low
Description
The print cartridge is at the estimated end of its useful life.
Print quality might decrease. Replace the print cartridge when the print quality becomes unacceptable.
Recommended action
To ensure optimal print quality, HP recommends replac ing the print cartridge at this point. You do not
need to replace the print cartridge at this time unless the print quality is no longer acceptable. The
actual print-cartridge life can vary.
Once an HP print cartridge has reached the very  low threshold, the HP Premium Protection Warranty
on that print cartridge has ended. When choosing to continue printing past the very low threshold, all
print defects or print-cartridge failures will not be considered to be defects in materials or workmanship
in the print cartridge under the HP  Print Cartridge Warranty Statement.
Cyan cartridge low
Description
The print cartridge is nearing the estimated end of its useful life.
Recommended action
The product indicates when the print-cartridge level is  low. The actual print-cartridge life remaining can
vary. Consider having a replacement cartridge avail able to install when the print quality is no longer
acceptable. The print cartridge does not need to be replaced now.
Cyan cartridge very low
Description
The print cartridge is at the estimated end of its useful life.
Print quality might decrease. Replace the print cart ridge when the print quality becomes unacceptable.
Recommended action
To ensure optimal print quality, HP recommends replac ing the print cartridge at this point. You do not
need to replace the print cartridge at this time unless the print quality is no longer acceptable. The
actual print-cartridge life can vary.
Once an HP print cartridge has reached the very  low threshold, the HP Premium Protection Warranty
on that print cartridge has ended. When choosing to continue printing past the very low threshold, all
print defects or print-cartridge failures will not be considered to be defects in materials or workmanship
in the print cartridge under the HP  Print Cartridge Warranty Statement.
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							Fuser kit low
Description
The fuser kit is low. The actual supply life remaining might vary. Consider having a replacement fuser
kit available to install when print quality is no long er acceptable. You do not need to replace the fuser
kit at this time unless print quality is no longer acceptable.
Recommended action
If print quality is no longer acceptable, replace the  fuser kit. Instructions are included with the fuser kit.
Fuser kit very low
Description
The fuser kit is very low. The actual supply life remaining might vary. You do not need to replace the
fuser kit at this time unless print quality is no  longer acceptable. After an HP supply has reached the
very low threshold, the HP Premium Protection Warranty for that supply has ended.
Recommended action
If print quality is no longer acceptable, replace the  fuser kit. Instructions are included with the fuser kit.
Incompatible  cartridge
Description
The indicated color print cartridge is not compatible with this product.
Recommended action
Replace the print cartridge with one that is designed for this product.
Incompatible fuser
Description
The fuser is not compatible with this product.
Recommended action
WARNING!The fuser can be hot while the product is in  use. Wait for the fuser to cool before
handling it.
1. Open the right door.
2. Remove the incompatible fuser.
3. Install the correct fuser.
4. Close the right door.
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