HP LaserJet 4250 User Manual

Managing the print cartridge
This section provides information about HP print cartridges, their life expectancies, how to
store them, and how to identify genuine HP supplies. Information also appears about non-
HP print cartridges.
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HP print cartridges
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Non-HP print cartridges
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Print-cartridge authentication
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Print-cartridge storage
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Print-cartridge life expectancy
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Checking the supply level
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Cartridge-low and cartridge-out conditions
HP print cartridges
When you use a genuine HP print cartridge,...

Print-cartridge life expectancy
The life of the print cartridge depends on the amount of toner that print jobs require and the
length of life for the components inside the  cartridge. When printing text at 5% coverage
(typical for a business letter), the HP print cartridge lasts an average of 10,000 (Q5942A) or
20,000 (Q5942X) pages.
At any time, you can verify life expectancy by checking the supply level, as described in
Checking the supply level .
Checking the supply level
You can check the supply...

When the cartridge is low on toner or drum life
When the cartridge is low, the printer control panel shows the  ORDER CARTRIDGE
message. For the HP LaserJet 4250 series, the  message first appears when about 15%
(10,000-page cartridge) or about 8% (20,000-page cartridge) of the life remains in the print
cartridge. For the HP LaserJet 4350 series, the  message first appears when about 25%
(10,000-page cartridge) or about 15% (20,000-page cartridge) of the life remains in the print
cartridge. This...

Cleaning the printer
Use the cleaning procedure on the following page every time you change the print cartridge
or whenever print-quality problems occur. As much as possible, keep the printer free from
dust and debris.
●Clean the outside of the  printer with a slightly water-dampened cloth.
● Clean the inside with a dry, lint-free cloth.
CAUTION
Do not use ammonia-based cleaners on or around the printer. While cleaning the printer, be
careful not to touch the transfer roller (the  black, rubber roller...

2. Open the top cover and remove the print cartridge.
WARNING!Avoid reaching too far into the printer. The adjacent fusing area might be hot.
CAUTION
To prevent damage to the print cartridge, do not expose it to light for more than a few
minutes. Cover the print cartridge with a sheet of  paper while it is outside of the printer.
3. Wipe any dust or dirt off the paper  feed guides (shaded areas) with a dry, lint-free cloth.
NOTEIf toner gets on your clothing, wipe it off with  a dry cloth and wash...

The cleaning procedure takes about 2.5 minutes to complete. A CLEANING message
appears on the printer control panel display while the cleaning is taking place.
Running the cleaning page manually
In order for the cleaning page to work  properly, print the page on copier-grade paper (not
bond, heavy, or rough paper).
To run the cleaning page manually
1. If a duplexer is installed, open the rear output bin.
2. Press  M
ENU to open the menus.
3. Use 
 (UP button) or  (DOWN button) to scroll to  CONFIGURE...

Performing preventive maintenance
You should replace certain parts when the PERFORM PRINTER MAINTENANCE message
appears on the printer control panel display. This  will help ensure that your printer maintains
optimum performance.
The maintenance message will appear every 200,000 pages. The message can be
temporarily cleared for approximately 10,000  pages by using the CLEAR MAINTENANCE
MESSAGE  item on the Resets submenu. (See 
Resets submenu.) To check the number of
pages the printer has printed since...

Replacing the stapler unit
Use these steps to replace a defective stapler unit in the optional stap\
ler/stacker.
To remove and replace the stapler unit
1. Locate the stapler unit on the right side of the stapler/stacker.
2. Rotate the stapler unit toward the front of the printer until the unit clicks. Hold the stapler
unit in this open position.
3. Push down on the tab at  the top of the stapler unit.
4. Hold the tab down and pull the stapler  unit up and out of the stapler/stacker.
116Chapter 3...

5. Disconnect cable that connects the stapler unit to the stapler/stacker. (Only the blue part
detaches.) Release the white tab that contains  the blue cable connector by opening the
tab to the left.
6. Remove the new stapler unit from its packaging.
7. Connect the cable on the  new stapler unit to the stapler/stacker.
8. Place the peg that is located on the bottom  of the new stapler unit into the hole in the
stapler/stacker.
ENWW Replacing the stapler unit117
 

9. Press down on the tab at the top of the stapler unit and push the unit into the stapler/
stacker.
10. Rotate the stapler unit toward the rear of  the printer until the unit clicks into place.
11. If the stapler cartridge is not installed in the stapler unit, install it now. (See Loading
staples.)
118 Chapter 3 Managing and maintaining the printer ENWW