HP ® PRO MFP M125 SERIES CF283A
TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
HP CF283A TONER CARTRIDGE
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
REMANUFACTURING THE HP LASERJET PRO
MFP M125 SERIES CF283A TONER CARTRIDGE
By Mike Josiah and the Technical Staff at UniNet
In December 2013, Hewlett Packard released the LaserJet Pro M125 series of printers. The M125 series of laser printers are
based on a 21-ppm, 600 x 600dpi (1200dpi with Fast Res) Canon engine. As with almost all HP cartridges now, these new
cartridges use a chip that controls the toner low functions and must be replaced each cycle. The CE283A is rated for 1,500 pages.
The printer itself has a very small foot print. It’s a nice small office/home machine. The memory is fixed and not expandable at
128Mb. The recommended monthly volume is from 250-2,000 pages/month. These machines also have a new feature called
“Smart Install” in which the printer driver is built into the printer so no drivers need to be installed. Just plug in the USB or Ethernet
cable and it installs itself.
The printer when new comes with a starter cartridge that is rated for 700 pages at 5% coverage, so your customers will be coming
to you fairly quickly! The starter cartridges and replacement CE283A (1,500-page) cartridges are physically the same, so you can
make a standard cartridge from the starter.
FOUR PRINTERS BASED ON THIS ENGINE SO FAR
MFP M125
MFP M127
MFP M201
MFP M225
The new 83A cartridge is a modified version of the older P1102 cartridges. In fact many parts for those cartridges work in these
also. Conversion kits are being developed now and should be available as you read this.
Cartridge troubleshooting will be covered at the end of this article.
CARTRIDGE THEORY
The theory for these cartridges is a little different from past versions so we have covered it here. You don’t have to know the theory
to remanufacture cartridges, but it sure helps if you have a problem. Troubleshooting time can be dramatically reduced;
for example: knowing that the primary charge roller (PCR) charges and erases the drum tells you that if there is a backgrounding,
ghosting or light print problem, they could be caused by the PCR (erasing poorly = backgrounding and/or ghosting or poor
charging light print).
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
Shown is a nice block diagram of the printing process.
The image formation process consists of a series of steps. In the first step, the Primary Charge Roller (PCR) places a uniform
negative DC bias voltage on the OPC drum surface. The amount of negative DC bias voltage placed on the drum is controlled by
the printer’s intensity setting. This process is part of the latent image formation block.
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
In the second step, the laser beam is fired onto a rotating mirror (called the scanner). As the mirror rotates, the beam reflects
into a set of focusing lenses. The beam then strikes the OPC’s surface, which neutralizes the negative charge on the drum and
leaves a latent electrostatic image on the drum. Note that the laser unit actually fires two beams, which allows for faster printing.
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
The third step (developing block) is where the toner image is developed on the drum by the developing section
(or supply chamber), which contains the toner particles. The toner is held to the magnetic roller sleeve by the stationary magnet
inside the sleeve, and a DC bias voltage supplied by the high voltage power supply. This DC bias voltage is controlled by the
printer’s density setting, and causes either more or less toner to be attracted to the drum. This in turn will either increase or
decrease the print density. Both the primary charge roller's and magnetic roller's DC bias voltages are controlled by the printer’s
density setting. The amount of toner on the magnetic roller sleeve is also controlled by the rubber doctor blade, which uses
pressure to keep the amount of toner on the magnetic roller sleeve constant. This blade also causes a static charge to build up
on the toner, which helps keep the coating of toner even and allows easy transfer to the OPC drum.
At the same time, an AC signal is also placed on the magnetic roller sleeve. This signal decreases the attraction of the toner to
the magnetic roller sleeve, and increases the repelling action of toner against the areas of the drum that was not exposed to the
laser beam. This AC potential improves the density, and contrast of the toner on the printed page.
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
As the laser-exposed areas of the OPC drum approach the magnetic roller, the toner particles are attracted to the drum's surface
due to the opposite voltage potentials of the toner, and laser-exposed surface of the OPC drum.
In the fourth step (transfer block), the toner image is then transferred to the paper as it passes below the drum by the transfer
charge roller, which places a positive charge on the back of the paper. This positive charge causes the negatively charged toner
on the drum’s surface to be attracted to the page. The small diameter of the drum, combined with the stiffness of the paper,
causes the paper to peel away from the drum.
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
In the fifth step (also part of the transfer block), the paper separates from the drum. The static charge eliminator weakens the
attractive forces between the negatively charged drum surface, and the positively charged paper. This prevents toner dropouts
onto the paper at low temperatures and humidity and also prevents paper from wrapping around the drum.
In the sixth step, the image is then fused on to the paper by the fuser assembly, which is comprised of the upper fixing
film assembly, and the lower fuser roller. The paper passes between a heated upper fixing film assembly and a soft lower
rubber roller. The upper heated element then melts the toner into the paper. The fixing film assembly consists of a Teflon sleeve
with a ceramic heating element inside. These fusers are a bit different in that they have a brush, which has a DC bias charge on
it to help keep the film clean.
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
In the seventh step, the OPC drum is cleaned. On average, approximately 95% of the toner is transferred to the paper during the
print cycle. As the drum rotates during printing the remaining 5% of toner on the OPC drum, is cleaned off by the wiper blade.
It is then guided into the waste chamber by the recovery blade, and stored in the waste chamber.
(Figure H)
The eighth step is where the residual charge is eliminated. The primary charge roller places an AC voltage across the
drum's surface, which erases any residual charges on the drum. This drum charge elimination is only turned on during the last
rotation period of the drum.
The following 12 photos show the physical differences between the CE278A, CE285A and the new CF283A cartridges...
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
78A TOP
85A TOP
83A TOP
78A RIGHT
85A RIGHT
83A RIGHT
78A LEFT
85A LEFT
83A LEFT
78A BOTTOM
85A BOTTOM
83A BOTTOM
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
REQUIRED SUPPLIES
1. New replacement toner for use in HP Pro M125
2. New replacement drum
3. Replacement chip (dedicated)
4. Wiper blade
5. Doctor blade
6. Magnetic roller
7. Sealing strip
8. Cotton swabs
9. Isopropyl alcohol
9. Drum padding powder
10. Conductive grease
REQUIRED TOOLS
1. Phillips head screwdriver
2. Small common screwdriver
3. Needle-nose pliers
4. Jeweler's screwdriver set
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www.uninetimaging.com
1. With the handle facing you, remove the right-side screw and end cap from the cartridge.
Be careful of the drum cover spring! Remove it with the end cap.
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
2. With the pair of needle-nose pliers, release both hopper tension springs.
3. Slide the waste/drum section over to the left side.
Separate the two halves.
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
4. On the waste/drum section, lift the drum up from the gear side.
Twist and remove it from the hopper.
5. Remove the PCR and clean with your standard PCR cleaner.
6. Remove the two screws and the wiper blade.
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
7. Clean out all the waste toner from the hopper. Be careful not to damage the recovery blade located next to the wiper blade.
If this blade is bent in any way, the cartridge will leak. Make sure the wiper blade foam seals are clean.
8. Coat the new or cleaned wiper blade with your
preferred lubricant. Install the wiper blade and two screws.
9. Install the cleaned PCR. Place a small amount of conductive
grease on to the black holder side of the shaft. Just a small
amount of grease is more than sufficient.
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
10. Place another small amount of conductive grease onto the
metal drum axle.
DRUM GEAR REPLACEMENT
UPDATE: If you are replacing the drum, the gears will need to be changed over from the OEM to the new.
There are two methods of removing the gears from OPC drums: The first and easiest method is to place the drum in a metal vice
approximately 2" back from the gear, and slowly tighten the vice. The gear should pop out easily. This is the only method you can
use on the OPC drums, which have a weighted slug in the center. If you use this method go on to step #3. The other method is
as follows…
REQUIRED TOOLS & MATERIALS
1. A 1/4" x 15" metal rod
2. A 1" x 15" wooden dowel
3. A tube of super glue
4. A small piece of Emory-cloth or sand paper
Step #1 - Removal of the drive gear: The drive gear is the gear that has no metal electrical contacts in it. These gears are usually
larger than the contact gear.
A. Carefully insert the 1/4" metal rod into the center of the gear that has the contacts, or the contact gear.
B. Angle the rod so that the rod presses against the edge of the opposite gear. The rod should be touching both the inside of the
OPC drum and the edge of the gear.
C. Tap the end of the rod with a hammer, working the rod around the entire edge of the gear, until the gear comes loose.
NOTE: Gently heating the ends of the drum with a hair dryer or heat gun on low may cause the glue to soften and ease in the
removal process. Just be careful not to use too much heat and melt the gear!
Step #2 - Removal of the "contact" gear:
A. Insert the 1" wooden dowel into the gearless end of the drum.
B. Tap the dowel with a hammer until the gear comes loose.
Step #3 - Remove any old adhesive from the gears, and straighten out any damage done to the contact gears'
metal contacts: Removing the adhesive can be done with a small sharp common screwdriver. The glue comes off easily.
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
Step #4 - Install the gears on the new replacement drum:
A. Inspect the metal contacts on the contact gear. Make sure that the contacts will make proper contact with the inside of the
OPC drum.
B. Locate the side of the drum on which you are going to place the contact gear. On some OPC drums, this is critical. See individual
instructions for more information.
C. Lightly sand the INSIDE of the OPC where the metal parts of the contact gear will meet. This will insure a good
electrical contact.
D. "Dry fit" the contact gear in the OPC drum and check for a good contact with an Ohmmeter. The reading should be a direct
short, or no more than 1 or 2 Ohms.
NOTE: When checking the contact, place one lead on the drum axle contact and the other on the edge of the drum. This way,
you will not have to pierce the coating that is on the OPC surface. A Radio Shack store carries inexpensive Ohmmeters for less
than $10.00 USD, and the sales people would normally be glad to show you how to use it.
E. Using the super glue, place a few (3-4) small drops of glue strategically around the inside edge of the OPC drum. Make sure
you leave a blank area for the metal contacts!
F. Insert the contact gear.
G. Check for continuity again with the Ohmmeter.
H. Repeat steps E and F for the drive gear.
NOTE: Be very careful not to place the metal contacts in direct contact with the glue, as this will interfere with the proper grounding of the drum, and the cartridge will not print properly, (solid black pages). It is also very important to NOT put any glue on the
gear, as the chances of it dripping out onto the drum surface and ruining it are high. Placing the glue inside the drum tube works
much better.
11. Install the new/cleaned drum, hub-side first.
13. On the right side of the toner supply chamber, remove the
two screws and end cap.
12. Place the waste/drum section aside.
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
14. Remove the gears from the hopper as shown.
Leave the large auger-gear in place.
15. Remove the single screw and end cap from the
opposite side.
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
16. Remove the magnetic roller assembly.
Be careful of the bushings! They are very fragile.
17. Remove the doctor blade and two screws.
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
18. Clean out all the remaining toner from the hopper.
Make sure the magnetic roller seals and the doctor blade
seals are all clean.
19. Fill the hopper with new replacement toner for use in the
HP Pro M125.
20. When a seal becomes available, remove the seal port plug, and install the seal.
Bring the tail out through the seal porthole.
Install the plug.
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
21. Install the left-side end cap and screw.
Make sure the small contact piece is installed correctly on the end cap.
22. Install the doctor blade and two screws.
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
23. Install the magnetic roller black bushing side first.
24. Install the gears as shown.
Turn the roller until the keyed end locks in place.
25. Install the end cap and screws.
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
26. Place the drum/waste hopper into the toner hopper.
Slide it over so the round hinge pins fit into their respective holes.
27. Set the hopper tension springs back in place.
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
28. With the drum cover spring as shown on the end cap, install the end cap.
Lift up the tail of the spring to fit onto the hopper.
29. Lift up the drum cover sprint tail to fit as shown on the drum cover.
Install the screw into the cover.
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HP PRO MFP M125 SERIES CF283A TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS
30. Replace the chip.
REPETITIVE DEFECT CHART
OPC drum:
Upper fuser film:
Lower pressure roller:
Transfer roller:
Magnetic roller:
PCR:
75 mm
57 mm
56 mm
39 mm
34 mm
27 mm
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