HP LaserJet 4000/4050 Series Maintenance Roller Kit Instruction

Welcome to visit our website at http://www.donparts.com

1 / 10

HP LaserJet 4000/4050 Series Maintenance Roller Kit Instruction

1. What is included in this HP LaserJet 4000/4050 maintenance roller kit

2. Transfer roller installation

3. Tray 1 (Multi-purpose tray) pick-up roller

4. Tray 1 (Multi-purpose tray) separation pad

5. Separation rollers and feed rollers

6. Reset the maintenance count

7. D-shaped pickup roller replacement

Picture Description Qty in kit

Transfer roller (RG5-4283) 1

Separation/feed roller (RF5-1885) 4

Tray 1 (Multi-purpose tray) pick-up

roller (RG5-3718) 1

Tray 1 (Multi-purpose tray) separation

pad (RB1-5281) 1

Cassette tray Pickup rollers (RB1-8865) 8

Transfer Roller Installation


2 / 10

With the printer facing toward you, open the top

cover and remove the toner cartridge.

You will find this blue plastic hook included in the

box with your new transfer roller. Use the hook

to carefully lift the left end of transfer roller up,

then slide the transfer roller to the left to

remove it from the right collar.

Make sure to remove the transfer roller gently

and carefully.

When handling the replacement transfer roller

be careful not to touch the black roller surface.

Oils from your skin can adversely affect print

quality. Some people recommend wearing latex

gloves when handling the transfer roller but it

isn't necessary if you are careful to only touch

the ends. It is unlikely that you would ever

notice poor print quality from accidentally

touching the transfer roller's surface.

Insert the new transfer roller making sure the

black plastic collar at the left end of the roller is

oriented with the open end facing down.

Tray 1 (Multi-Purpose Tray) pick-up roller

Remove the toner cartridge if it hasn't already

been removed. Open Tray 1 (flips down).

Remove the plastic piece circled below by pulling

straight out.


3 / 10

Next take a small flat head screwdriver or your

fingernail and pop open the blue tab on the

pick-up roller. Then pull the roller straight up

and out.

When you replace the pick-up roller make sure

the blue tab is facing you and the pin is seated in

the shaft (see below). If you are replacing the

separation pad (highly recommended), wait to

replace the pick-up roller until after you have

replaced the separation pad.

Tray 1 (Multi-purpose tray) separation pad


4 / 10

Remove the toner cartridge if it hasn't already been

removed. Open Tray 1 (flips down). Remove the plastic

piece circled below by pulling straight out.

Next remove the Tray 1 sensor arm cover as shown below.

Be careful to pull straight out. You might need to use a

little more force than you think to pull this out. It snaps

out on the left and right.


5 / 10

This is a picture of the sensor cover with the two sensor

flags pointing up. Keep the sensor cover attached to the

tray.

Next the plastic piece circled in red below needs to be

unclipped. (Some of the older LaserJet 4000's do not

unclip, see the second picture.) The picture below is of a

LaserJet 4100 which is easier to photograph, but uses

mostly the same parts. The unclipping procedure is the

same on a LaserJet 4050 and newer revisions of the

LaserJet 4000. Simply pull up at the three points circled in

yellow where the plastic piece snaps onto the shaft.


6 / 10

For older revisions of the LaserJet 4000 the plastic piece

pictured above does not unclip. You need to bend the

plastic up in order to slide the two black discs to the left.

You need to use a little muscle to lift the plastic up, but it's

the only way to slide the two discs to the left. Now you can

get at the separation pad.

The next step is to actually replace the separation pad.

The following picture shows the two styles of separation

pads that are available: one is the old style, in which case

you have to replace the whole assembly. But if you have

the new style assembly in your printer, you can just swap

the grey pads. The next few pictures will show you how to

do it both ways.

If you have the Old-Style Separation Pad (the original

LaserJet 4000 series) ...

If the current separation pad you have installed in your

machine is the "old style", you will need to replace the

entire separation pad assembly. To remove the old

assembly simply take a small flat head screwdriver and

pop out the plastic arms circled in the picture below. This

will free the separation pad. Remove it and save the

springs. You will reuse the springs on the new separation

pad assembly.

Transfer the springs onto the bumps on the bottom of the

new separation pad assembly. Install the new pad. Slide

one of the black disks all the way to the right, install the

pickup roller. Slide the second black disc all the way back

to the right, and follow the reverse procedures to

re-assemble everything.


7 / 10

OR... if you have the New-Style Separation Pad (on the

newer LaserJet 4000 series and the 4050 series)

If you have the "new style" separation pad assembly in

your machine, all you need to do is swap the grey pads.

First use a flatblade screwdriver to pry your old grey pad

free.

Pry the same grey pad free from the new separation pad

assembly. You will install the pad only.

Insert the new grey pad (teeth of the pad pointing down)

and lock it down firmly onto the black plastic assembly.

Slide one of the black disks all the way to the right, then

install the pickup roller. Slide the second black disc all the

way back to the right, and follow the reverse procedures

to re-assemble everything.

Installing the feed rollers


8 / 10

The feed rollers and separation rollers on a LaserJet 4000

are identical. Each lower tray uses one feed roller and one

separation roller. If you have one lower tray you only need

two rollers. If you have a 4000T or 4050T then you will

need four rollers. If you have a 4000T or 4050T with an

optional lower cassette then you will use six rollers.

Pull the trays out of the printer and look up into the printer.

You should see the roller circled in red below. Simply pinch

the tabs together on the left side of the roller and pull the

roller out. Push the replacement roller in place and move

on the the remaining lower cassettes (if they are

installed). The rollers will install in the same manner.

Installing the separation rollers

Place the paper tray in front of you and press the tab

circled below forward. Then swing the hinged piece up.

Pinch the two tabs on the roller and pull the roller out.

Replace with a new roller and repeat this procedure for all

of the installed lower trays.

Reset the maintenance count on an HP LaserJet 4000, 4050, 4100, 5000

"The Short Cut Method"

1. Turn the printer off.

2. Hold down the Item key (the minus side of the button) and Value key (the minus side).

3. Turn the printer on.

4. Wait for RESET MAINTENANCE COUNT to be displayed and then release both keys.

NOTE: Some versions of the 4000, 4050, 4100, and 5000 will NOT have their maintenance count reset by following the preceding

"short cut" method. This is due to the many different formatter board revisions. If the short cut method doesn't reset the

maintenance count then you will need to go into service mode to manually reset the maintenance count to zero.

Once the maintenance count has been reset the "perform printer maintenance" message won't appear again until the maintenance

interval has been reached (200,000 pages on a LaserJet 4000, 4050, 4100, and 5000 series printers).

D' shaped pickup roller replacement for trays 2, 3, and 4.

Each lower paper tray in the LaserJet 4000/4050/4100 series printers has 4 'D-shaped' pickup rollers. These rollers do not wear

out as quickly as the feed and separation rollers. If you do replace the rollers please read the instructions carefully. It is a fairly simple

procedure if you are patient and careful.

Four rollers are located above each paper tray as shown below.

Single Tray Models 2-Tray models


9 / 10

There are two versions of this pickup roller. One is about half

the size of the other. Both perform equally well. The rollers

have a post that fits in the hole on the pickup

You can remove the rollers without moving the printer but it's

a little awkward and hard to see up into the printer. We find it's

easiest to first unplug all cables from the printer and remove

the toner cartridge and any accessories (envelope feeder,

duplexer, optional lower trays). Carefully rock the printer on to

its back to get a better view of the rollers. The pickup roller

shaft rotates in either direction. DO NOT remove the shaft and

BE VERY CAREFUL not to dislodge the spring on the left! (see

picture below). If you remove the spring it's a real pain in the

neck to put back on. (Read the next section if the spring is

accidentally removed.)

Each "D" roller clips onto the shaft with a little locking tab (tabs

circled in red below). Remove the rollers by pressing on their

locking tabs and pull each roller straight off the shaft.

An easy way to install the replacement "D" rollers is to rotate

the shaft and so the holes are facing you and push the roller

straight on to the shaft. The roller will only fit one way so you

don't need to worry about installing it backwards.


10 / 10

Re-attaching the spring on the LaserJet 4000/4050/4100 "D" roller bar.

If you aren't careful the spring which restrains the pickup roller shaft may come loose while you are replacing the rollers.

Re-attaching this spring can be tricky and will require your patience...

Picture of spring attached Picture of spring removed. Notice the

notches circled in red where the spring

needs to be reattached.

It's easiest to first hook the top of the

spring over the notch then repeat with

the white hook on the other end. You

can remove the bottom plate of the

printer to get better access.

HP LaserJet 4000/4050 Series Maintenance Roller Kit Instruction

Documents

Transcript of HP LaserJet 4000/4050 Series Maintenance Roller Kit Instruction