HP LaserJet Enterprise M551dn 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...

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.
106 Chapter 7   Print cartridges, tone r collection unit, and other supplies ENWW
 

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...

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...

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...

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...

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...

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...