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  • Remanufacturing the Lexmark CS720 and Ricoh C6003 Toner cartridges

    By Mike Josiah and the Technical Staff at Uninet

    These two different engines are the latest in our “Easy to do” series. Toner cartridges that are very simple to remanufacture, do not need to be tested and have a high profit potential.

    Lexmark CS720
    Lexmark CS720

    Lexmark CS720

    The Lexmark CS720 is based on a 40ppm 4800DPI color engine. The toner cartridge is a small rectangular cartridge that houses the toner and reset chip. There are three different yield cartridges available for this series.

    The part numbers and list pricing for these toners are as follows:

    Black 74C10K0 3000 pages $92.99*
    Cyan 74C10C0 3000 pages $121.99*
    Magenta 74C10M0 3000 pages $121.99*
    Yellow 74C10Y0 3000 pages $121.99*

    Black 74C1SK0 7000 pages $174.99*
    Cyan 74C1SC0 7000 pages $199.99*
    Magenta 74C1SM0 7000 pages $199.99*
    Yellow 74C1SY0 7000 pages $199.99*

    Black 74C1HK0 20000 pages $325.99*
    Cyan 74C1HC0 12000 pages $312.99*
    Magenta 74C1HM0 12000 pages $312.99*
    Yellow 74C1HY0 12000 pages $312.99*

    * Pricing as of December 1st 2018


    Current machines released so far are:

    CS720de
    CS720dte
    CS725de
    CS720dte
    CX725de
    CX725dhe



    Required Tools

    Toner approved vacuum.

    Small jewelers type common screwdriver

    1.27mm Allen wrench

    Heat gun


    Required Supplies

    Toner for use in the CS720 toner cartridge: Choose the correct color and gram weight for your cartridge

    Replacement reset chip Choose correct color and yield

    100% Silicon caulk (For leaks)


    1) Vacuum the exterior of the cartridge

    2) With the heat gun, remove the top label See Figure 1

    Figure 1
    Figure 1



    3) Remove the fill plug from the toner cartridge. Dump the remaining toner. See Figure 2

    Figure 2
    Figure 2



    4) Carefully vacuum/blow the cartridge clean.

    5) Fill the cartridge with the appropriate color and amount of toner for use in the Lexmark CS720. Make sure you’re using the correct amount of toner to match your replacement chip. See Figure 3

    Figure 3
    Figure 3



    6) Replace the fill plug and check for leaks. The plus are easily damaged. If there is a leak, seal the perimeter of the plug with 100% silicon. See Figure 4

    Figure 4
    Figure 4



    7) Wipe the cartridge down to remove any remaining toner dust.

    8) Take the 1.27mm Allen wrench and remove the upper small screw at the bottom of the cartridge. See Figure 5

    Figure 5
    Figure 5



    9) Press in on the two tabs and release the chip holder. See Figures 6 & 7

    Figure 6
    Figure 6



    Figure 7
    Figure 7



    10) With the 1.27mm Allen wrench remove the ship screw and chip. See Figure 8

    Figure 8
    Figure 8



    11) Install a new chip and replace the screw. See Figure 9

    Figure 9
    Figure 9



    12) Install the chip holder and screw. See Figures 10 & 11

    Figure 10
    Figure 10



    Figure 11
    Figure 11



    13) Place a suitable label over the fill plug.

    That’s it! You’re done!


    Ricoh C6003
    Ricoh C6003

    Ricoh


    The Ricoh C6003 is based on a 60ppm 1200 x 1200 DPI color engine. The toner cartridge is a long round tube type cartridge that houses the toner and reset chip.

    The part numbers and list pricing for these toners are as follows:


    Black 841849 33,000 pages $56.95*
    Cyan 841852 22,500 pages $90.00*
    Magenta 841851 22,500 pages $90.00*
    Yellow 841850 22,500 pages $90.00*

    * Pricing as of December 1st 2018

    Current machines released so far are:

    MP C4503
    MP C4504
    MP C5503
    MP C6003
    MP C6004


    Required Tools

    Toner approved vacuum.

    Small jewelers type common screwdriver


    Required Supplies

    Toner for use in the Ricoh C6003 toner cartridge: Choose the correct color and gram weight for your cartridge

    Replacement reset chip: Choose correct color and yield


    1) Vacuum the exterior of the cartridge

    2) If present, unscrew the toner cover. See Figure 12

    Figure 12
    Figure 12



    3) Pull up on the three small tabs on the outer port cover and remove the cover. See Figures 13, 14, 15 & 16

    Figure 13
    Figure 13



    Figure 14
    Figure 14



    Figure 15
    Figure 15



    Figure 16
    Figure 16



    4) Press down on the spring loaded toner seal and vacuum the tube clean. (allow air in so the cleaning goes faster). See Figures 17 & 18

    Figure 17
    Figure 17



    Figure 18
    Figure 18



    5) Press in the toner port seal with the bottle funnel and fill the cartridge with the appropriate color and amount of toner for use in the Ricoh C6003. Make sure you’re using the correct amount of toner to match your replacement chip. See Figure 19

    Figure 19
    Figure 19



    8) Remove the small chip holder from the outer port cover by pressing in on the two tabs from the inside of the cover. See Figure 20

    Figure 20
    Figure 20



    9) Remove the old chip. See Figure 21

    Figure 21
    Figure 21



    10) Press the new chip in from inside the holder. Make sure it snaps in place. See Figure 22

    Figure 22
    Figure 22



    11) Install the chip holder, make sure the tabs lock in place. See Figure 23

    Figure 23
    Figure 23



    12) Clean the end of the tube and snap the port cover into place. Make sure the three tabs lock into the correct channel. See Figures 24 & 25

    Figure 24
    Figure 24



    Figure 25
    Figure 25



    13) Screw the toner cover in place. (If available) See Figure 26

    Figure 26
    Figure 26



    That’s it! You’re done!
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