Hewlett Packard® LaserJet 4000 Cartridge Remanufacturing Instructions...
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HP® 4000
Remanufacturing Instructions
Reference Information:
Materials needed:
OEM Part Numbers:
Toner
C4127A
Drum (if needed)
C4127X
PCR (if needed)
Replacement mylars (if needed)
OEM Yields:
Wiper Blade (if needed)
(27A) 6,000 pages @ 5%
Lint free, Wax free wipes
(27X) 10,000 pages @ 5%
Cotton Swabs
99% Isopropyl Alcohol
Tools Required:
Oasis Conductive Grease
Oasis Pin Removal Tool (H4TL10)
Oasis PCR cleaner
# 2 Philips Screwdriver
Oasis HP4 Cartridge Pins (H4PN10)
# 1 Flat Tip Screwdriver
1/8" Punch or smaller
Approximate Remanufacturing
Time: 25 min.
Instructions:
The Hewlett Packard® LaserJet 4000 laser printer uses a typical HP
cartridge in that the toner hopper and the drum/waste hopper are located in one
disposable unit. The toner hopper contains the toner reservoir, the doctor blade,
the toner low sensor bar and the magnetic roller assembly. The drum/waste hop-
per contains the drum, the wiper blade, recovery blade and the waste hopper.
Also, the retractable drum shutter is attached to the toner hopper and must be
removed prior to disassembly to avoid damaging the OPC drum. The cartridge
halves are held together by a pair of retaining pins; one on each end of the cart-
ridge. The retaining pins are flared at the ends and cause damage to internal
components if pushed into the cartridge and therefore must be removed from the
inside.
Figure 1
Separating Cartridge Halves
1. Insert the H4TL10 into the laser port on top of the cartridge as shown in
(Fig. 1). The pegs on the angled portion of the tool should be aligned with the
cartridge pins. Due to the variances of the cartridges, the pegs on the
H4TL10 may not line up exactly, but after remanufacturing a few cartridges,
you will get the "feel" of the pins.
2. Move the H4TL10 to the right side of the cartridge until it stops. Hold the han-
dle opposite the pin to be removed (position your thumb in the middle of the
top of the tool (Fig. 2), and begin applying pressure to the pin. The OEM pins
Figure 2
may require a substantial amount of force before they will dislodge. If the pin
does not move, reseat the H4TL10 and try again. With some practice, you
will begin to acquire a "feel" for the proper placement of the tool and the
amount of pressure needed to remove the pins.
3. Once the right pin has been dislodged, move the H4TL10 to the left side until
it stops. Hold the handle opposite the pin to be removed (position your thumb
so that it is in the middle of the top of the tool Fig. 3), and begin applying
pressure to the pin.
Figure 3
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4. When both pins are removed, separate the cartridge halves. Note: The drum
shutter is still in place, so use caution when separating the halves. Set the
toner hopper aside.
OPC/Waste Hopper
1. Remove the two (2) screws securing the drum retaining plate (Fig. 4). Re-
move the OPC drum from the waste hopper. Clean, inspect and lubricate the
drum; replace if necessary (PN# H4DR10). Wrap the drum in a clean,
lint free cloth or store in a drum case to minimize light exposure.
Figure 4
2. Remove the PCR from the waste hopper and inspect for excessive wear;
replace if necessary (PN#H4CR10). Apply a small amount of quality PCR
cleaner to a clean, lint-free cloth and gently wipe the entire surface of the
PCR. Make sure any residual toner and or cleaner is completely removed
to ensure that proper voltage is maintained.
3. Remove the two (2) screws securing the wiper blade (Fig. 5). Then remove
Figure 5
the recovery mylar from the waste hopper. Clean out the hopper with com-
pressed air or a vacuum. Next, remove all adhesive from the recovery blade
mounting surface, and carefully apply a new recovery blade. Inspect,
lubricate and re-install the wiper blade; replace if necessary (PN# H4RB10).
4. Clean the black PCR saddle clip with a cotton swab and 99% IPA (Fig. 6).
This clip is conductive and supplies the current to the PCR. If it is dirty or the
PCR does not make good contact, print defects will occur. Re-install the PCR
and OPC. Rotate the OPC against the wiper blade and then remove residual
lubricant (padding powder) from the surface of the PCR with a clean lint-free
cloth. Any padding powder left on the PCR will cause print defects. Set
the drum unit aside and cover it with a clean cloth to protect it from light and
Figure 6
physical damage.
Toner Hopper
1. Gently pry the drum shutter arm from the right side of the cartridge being care-
ful not to lose the tension spring located in the receptacle at the top of the
arm (Fig. 7). When the arm is free, remove it from the shutter clips and set it
aside (Fig. 8a). Now remove the silver retaining arm by gently pulling on the
left side while rotating the arm back and upward. Note: The left side of the
silver retaining arm is keyed, and must be rotated in order to release the
Figure 7
keyed portion (Fig 8b).
2. Place the toner hopper on the work area with the magnetic roller facing you.
Remove the two (2) screws from the left side of the cartridge (Fig. 9A) and
release the clip (Fig. 9B). Next, remove the left end-cap (keep it in an upright
position to prevent the gears from falling off Fig. 10). Carefully remove the
magnetic roller by first lifting the left end of the roller and then gently pulling
it to the left. Note the location of all peripheral components on the mag roller
(bushings, brackets, etc (Fig 11). Use compressed air to remove residual
Figure 8a
toner from
the surface of the mag sleeve and inspect for damage. Set mag
sleeve aside or replace if necessary (PN# H4MR10).
3. Remove the two (2) screws holding the doctor blade in place (Fig. 12). Use
compressed air or a vacuum to remove residual toner from the blade; replace
if necessary (PN# H4DB10). Inspect the mag roller mylar for damage; replace
if necessary (PN# H4MY10). Clean the bias charge contact with a cotton swab
and alcohol (Fig. 13). At this time, fill the hopper with toner through the mag
roller slot or, if you are going to split and seal the toner hopper, proceed to the
hopper sealing section.
Figure 8b
Hewlett Packard® Laser Jet 4000 Cartridge Remanufacturing Instructions...
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4. Re-install the doctor blade and secure with two (2) screws. Re-install the mag
sleeve (make sure you replace the nylon brackets and bushings on each side.
Note: Both ends of the mag roller are keyed and must be in the proper
position during reinstallation. Once the mag sleeve and all peripherals are in
place, position the end cap on the left side and secure with two (2) screws.
5. Install the left and right ends of the silver shutter retaining arm(note the keyed
tip on the left end). Now align the tension spring in the receptacle of the drum
shutter arm: the far side of the spring must press down into the shutter arm
and the near side must rest on the notch on the right side of the receptacle
Figure 9a
(Fig.14). Affix the drum shutter arm onto the right side of the cartridge
ensuring the exposed end of the spring sits on the notch indicated (Fig.15).
Pull the arm back slightly and slowly release the arm. The leading end of the
arm should snap forward past the front of the hopper, if not; reseat the arm
and try again. When the spring and shutter arm are positioned properly,
insert the piton at the end of the shutter arm into the shutter clips (see fig 8a).
6. Place the cartridge halves together and avoid damaging the springs on top of
the toner hopper. Align the pin holes on each side and insert the cartridge
pins (PN# H4PN10) to hold the halves together.
Figure 9b
Figure 10
Figure 11
Figure 12
Figure 13 Figure 14
Figure 15
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Products, Inc. may result in legal action. All registered trademarks are the property of their respective owners.