HP 4 Plus Manual

Accessing the SIMM Slots
Please refer to Chapter 6, Removal and Replacement, for
instructions on removing the SIMMS door to access the slots.
Note that access to the SIMM slots are slightly different for the
various printer models.
Installing the SIMM Boards
1Through the open door, you can see the four SIMM board slots
(see previous Figure 3-23). For easiest installation, fill the
slots from right to left, starting with slot 1 (see the diagram on
the SIMM slots door).
2Remove the SIMM board from the...

3Hold the SIMM board at a 30-degree angle to the slot and
push the edge of the board evenly and firmly into the slot (see
Figure 3-25 callout (A) ).
4Rotate the SIMM board to the right until the board  “clicks”
into the metal locking tabs, securing the board into place (see
Figure 3-25 callout  (B)).
5Gently rock the SIMM board back and forth. If it is seated
correctly, it will not lift away from the slot. If it lifts up, you
have not pushed it firmly enough into the slot. Try again.  
6Replace the SIMM...

Testing a SIMM Board
Use the procedures below to print a self-test page to verify SIMM
board installation. Procedures are given for both memory and
PostScript SIMMs.
Memory SIMM
NoteFor the LaserJet 5/5M/5N, the 
On Line key has
been replaced by the Go  key.  The  Enter key has
been replaced by the Select key.
Running a Self Test Printout
1Plug in the power cord and turn ON the printer. 
2After a few seconds, 00 READY  should appear in the control
panel display.  If an error message appears, refer to
“...

Personality SIMM
(PostScript)
A personality (printer language) SIMM installation can be
verified as outlined below (a PostScript SIMM is used in this
example).
NoteFor the LaserJet 5/5M/5N, the 
On Line key has
been replaced by the  Go key.  The  Enter key has
been replaced by the  Select key.
 
1Plug in the power cord and turn ON the printer.
2After a few seconds, the on line indicator should light and  00
READY  should appear in the control panel display.  If an error
message appears, refer to...

Troubleshooting a SIMM Board
For more information about the service/error messages below, see
Chapter 7, Troubleshooting .
Service / Error Messages
One of two messages can be generated when your printer is
checking its SIMM internal memory. 
6\b.X SERVICE
where X = 1, 2, 3, or 4
This error indicates a SIMM parity error. The x indicates which
SIMM slot generated the error. If these messages appear first,
check the HP part number to make sure you have the right SIMM
board. 62.X ERROR
where X = 0, 1, 2, 3,...

3-60 Configuration 

4
Preventive Maintenance 
Introduction  
The printer requires minimum routine maintenance. Use this
chapter for information on:
•Service Checkpoints. These are the items that must be
cleaned and checked when the Toner Cartridge is replaced, or
before performing periodic maintenance.
•Toner Cartridge information, such as:
•Storing and installing the Toner Cartridge
•Refilled Toner Cartridges
•16 TONE\b LOW  message
•Required periodic maintenance on:
•Transfer roller
•Separation pads
•Paper pickup rollers...

Life Expectancy of Consumables      
Always inspect the components listed in Table 4-1 for wear when
servicing the printer. Replace these components as needed, based
on printer failures or wear, not strictly on usage.
DESCRIPTION QTY EST. LIFE(pages)REMARKS
1. Toner Cartridge 1 6800
1When print becomes faint, shake
cartridge to distribute remaining
toner.
2. MP (Tray 1) Pickup Roller Assembly 1 200,000Replace roller and separation pad
together.
3. PC (Tray 2) Pickup Roller 1 200,000Look for glazing and...

Service Checkpoints      
This is a fold-out page 3 panels wide.
Figure 4-1 Maintenance Checkpoints
Preventive Maintenance   4-3 

Cleaning Your Printer
When it is time to replace the toner cartridge, perform the
cleaning procedures outlined in Figure 4-1.
4-4 Preventive Maintenance