HP 4 Plus Manual

Toner Cartridge   
The toner cartridge in your printer contains the printing
mechanism and a supply of toner. Your toner cartridge life
depends on the amount of toner your jobs require.  When you print
word-processed text, a toner cartridge lasts approximately 6,800
pages, printed at 5% coverage. (A typical business letter, as
shown in Figure 4-2, is about 5% coverage.) This assumes that
the print density setting is in the middle range (set to 3 in your
printer’s control panel).  
Figure 4-2 Example of a...

Saving Toner with EconoMode (HP LaserJet 4
Plus and 5 Only)
Toner cartridge life can be extended dramatically by using the
EconoMode printing feature of the printer. EconoMode can be
turned on or off via the printer control panel, through HP’s
Remote Control Panel or through a software application with the
appropriate printer driver. 
Note EconoMode is recommended in portrait
orientation only.
Some software applications may refer to this as
“
draft mode ”.
Software settings always override control panel...

Installing the Toner Cartridge 
The toner cartridge is empty and must be replaced when the
toner low message cannot be cleared, as described in “Clearing
the  16 TONE\b LOW  Message” later in this section.
To replace the toner cartridge:
1Open the printer ’s top cover and remove the empty toner
cartridge.  
Note Inside the new HP toner box is a document which
explains HP
’s toner cartridge recycling policy.
Follow the instructions to package the empty
toner cartridge and return it for recycling.
2Remove...

3Remove the sealing tape by firmly grasping the tab on the
right side of the toner cartridge and pulling it straight out the
side of the cartridge. (See Figure 4-3.)
NotePulling the toner cartridge at an angle may
damage the toner cartridge seals.
4Position the cartridge with the arrow pointing into the printer
as shown in Figure 4-4.
5Insert the toner cartridge fully into the printer (press firmly).
6Close the top cover and press 
[On Line]  (or Go on the LJ 5) to
resume printing.
Figure 4-4 Inserting...

Non-HP Toner Cartridges 
While Hewlett-Packard does not prohibit the use of  Non-HP
toner cartridges during the warranty period or while under a
maintenance contract, we do not recommend their use. The
reasons for this are:
•Hewlett-Packard has no control or process to ensure that a
Non-HP toner cartridge functions at the high level of
reliability of an HP LaserJet toner cartridge.
Hewlett-Packard also cannot predict what the long term
reliability effect on the printer is from using different toner...

Clearing the TONER LOW Message     
If the 16 TONE\b LOW  message appears in the control panel display,
the toner level in the toner cartridge is getting low. The print
becomes lighter and white streaks may appear. (This message
means that it is time to replace the toner cartridge).
If the control panel Config Menu Toner Low item is set to  TONE\b
LOW=ON  (or \fONT  on the LJ4+ and LJ5 printers), the printer
continues to print with the  16 TONE\b LOW message in the control
panel display.   TONE\b LOW=ON...

Periodic Maintenance Procedures 
Each paper source has a Paper Pickup Roller that should be
replaced when paper no longer feeds reliably. The MP Tray (Tray
1) Paper Pickup Roller is shown in Figure 4-5. The PC tray (Tray
2) Pickup Roller is shown in Figure 4-7, the LC (Tray 3) Pickup
Roller is shown in Figure 4-8.
Removing the MP Tray (Tray 1) Pickup Roller
and Separation Pad     
To remove and replace the MP (Tray 1) Pickup Roller and
Separation Pad, follow the steps below.     
1Turn OFF and unplug the...

4Insert a small screwdriver into the indent at the front of the
separation pad and gently lift the pad from its seat (see Figure
4-6).
5Discard the used roller and pad.
Figure 4-6 Removing the MP Tray (Tray 1) Separation Pad
4-12 Preventive Maintenance  

Removing the PC (Tray 2) Pickup Roller   
The PC Pickup Roller is underneath the printer (see Figure 4-7).
To remove the Pickup Roller:
1Turn OFF and unplug the power cord from the rear of the
printer. If your interface cable is long enough, it may stay
attached, if not, remove it also.
2Remove the Toner Cartridge and the PC tray (Tray 2).
3Lay the printer on its left side.
4Remove the PC (Tray 2) Pickup Roller by pinching the release
clips and sliding the roller off the shaft.
Figure 4-7 Removing the PC...

Removing the Lower Cassette (LC) or (Tray 3)
Pickup Roller   
If your printer is equipped with the Lower Cassette Assembly,
proceed as follows:
1Remove the Lower Cassette Tray.  
2Press the retainers that hold the roller in place (see
Figure 4-8).
3Slide the Pickup Roller off the shaft.
Figure 4-8 Removing the Lower Cassette Pickup Roller
4-14 Preventive Maintenance