This document provides technical instructions for replacing printer cartridges and components in Lexmark T420 and T430 printers. It includes: 1) A list of required tools and supplies including screwdrivers, pliers, isopropyl alcohol, and new toner, wiper blade, drum. 2) 14 steps with accompanying photos describing how to remove and replace the toner hopper, drum, wiper blade, and doctor blade. 3) Contact information for Lexmark service centers worldwide.

1. T420/430TECH
Technical Instructions Printers/Supplies Tools 1
Printers: Needlenose Pliers
CORPORATE Lexmark T420dn Phillips Screwdriver
LOS ANGELES, USA Lexmark T430/430d/430dn Small Flat Blade Screwdriver
US 1 800 394.9900 Spring Hook
Int’l +1 818 837.8100
FAX 1 800 394.9910
Supplies: X-Acto Knife
Int’l +1 818 838.7047 T420 High Yield Return Program Print Cartridge 12A7415
T420 Return Program Print Cartridge 12A7410 Supplies Required:
ATLANTA, USA T420 High Yield Print Cartridge 12A7315 Toner
US 1 877 676.4223 T420 Print Cartridge 12A7310 Wiper Blade
Int’l +1 770 516.9488 Drum
FAX 1 877 337.7976
Int’l +1 770 516.7794 T430 High Yield Return Program Print Cartridge 12A8425 Lint free cloth
T430 Return Program Print Cartridge 12A8420 99% isopropyl alcohol
DALLAS, USA T430 High Yield Print Cartridge 12A8325 Cotton Swabs
US 1 877 499.4989 T430 Print Cartridge 12A8320
Int’l +1 972 840.4989
FAX 1 877 774.1750
Int’l +1 972 840.1750 Photo 1 Step 1
MIAMI, USA
US 1 800 595.429
Place the cartridge top down on the table with
Int’l +1 305 594.3396 the drum facing up and the gear end of the
FAX 1 800 522.8640 toner hopper is facing towards you. Using a
Int’l +1 305 594.3309
small flat blade screwdriver, pry off the devel-
NEW YORK, USA oper roller drive gear and set it aside.
US 1 800 431.7884 (See Photo 1)
Int’l +1 631 345.0121
FAX 1 800 431.8812
Int’l +1 631345.0690
SANFORD,USA
US 1 800 786.9049
Int’l +1 919 775.4584
FAX 1 800 786.9049
Int’l +1 919 775.4584 Photo 2 Step 2
TORONTO, CAN Rotate the cartridge to the right so the toner
CAN 1 877 848.0818 hopper is facing you. Using a spring hook or
Int’l +1 905 712.9501 needle nose pliers, gently remove the toner
FAX 1 877 772.6773 hopper tension springs from the posts at each
Int’l +1 905 712.9502
side. (See Photo 2 and 3)
BUENOS AIRES, ARG
ARG 0810 444.2656
Int’l +011 4583.5900
FAX +011 4584.3100
MELBOURNE, AUS
AUS 1 800 003. 100
Int’l +62 03 9561.8102
FAX 1 800 004.302
Int’l +62 03 9561-7751
SYDNEY, AUS Photo 3
AUS 1 800 003.100
Int’l +62 02 9648.2630
FAX 1800 004.302
Int’l +62 02 9548.2635
MONTEVIDEO,URY
URY 02 902.7206
Int’l +5982 900.8358
FAX +5982 908.3816
JOHANNESBURG, S.A.
S.A. +27 11 974.6155
FAX +27 11 974.3593
E-mail: info@futuregraphicsllc.com Website: www.futuregraphicsllc.com

2. 2 Lexmark T420/430 Technical Instructions
Photo 6
Step 5
While holding the drive gear of the drum, pull
the drum axle out. (See Photo 6)
Step 3
While holding onto the toner hopper
with your left hand, carefully bend
the waste hopper away from the
gear side of the toner hopper using
your right hand. Lift the right side of
the toner hopper up away from the
waste hopper. (See Photo 4) Photo 7 Remove the drum and set it aside, being sure
not to lose the spring attached to the small
Separate the toner hopper and gear side. (See Photo 7)
waste hopper. Set the toner hopper
aside. If you plan on reusing the drum, place the drum
NOTE: Do not lose toner hopper in a protected area and out of the light.
tension springs.
Photo 4 Photo 8 Step 6
Fold together two plates of PCR access shutter.
Using your right hand, bend the shutter in the
middle and, carefully bending the waste hopper
away with your left hand, remove the shutter pin
from the hopper. Remove the other pin and slid-
ing guide of the shutter from the waste hopper.
Be careful not to damage the waste hopper
recovery blade.(See Photo 8)
Photo 9 Step 7
Step 4
Place the waste hopper flat on the work bench.
Place the waste hopper with the Using a Philips screwdriver remove the two
drum facing up. Using a small flat screws that hold the wiper blade to the waste
blade screwdriver remove the “C” hopper.(See Photo 9)
clip from the drum axle on the drive
(large) gear end of the drum.
(See Photo 5)
Step 8
Using a small flat blade screwdriver pry the
Photo 5
wiper blade away from the waste hopper.
(See Photo 10)
Photo 10
Remove the wiper blade. (See Photo 11)
Photo 11
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3. Lexmark T420/430 Technical Instructions 3
Photo 12 Step 9
Dump the waste toner from the hopper. Using
dry compressed air or a vacuum, clean the
waste hopper. Visually inspect the waste hop-
per recovery blade. If the blade is wavy, Step 14
nicked, or torn, the blade will have to be
replaced. (See Photo 12) Place the toner hopper on the table
(label up) with the developer roller
facing you. Carefully remove the
doctor blade tension spring from the
hopper.
(See Photo 17)
NOTE: Do not let the tension spring
Photo 13 Step 10 slip and hit the developer roller. This
Apply a small amount of padding powder to the will scratch the roller and could
new wiper blade. Place the new blade onto the cause print defects.
waste hopper and install the two screws that
hold the blade in place.
(See Photo 13)
Photo 17
Photo 14 Step 11
Holding PCR access shutter with your left
hand, install the shutter pin and sliding guide
into the waste hopper. Fold together two plates
of PCR access shutter, bend the shutter with
your right hand and install the other pin into the
hopper. Be careful not to damage the waste
hopper recovery blade. (See Photo 14) Step 15
Using a small flat blade screwdriver
pry the developer roller contact off
the brass contact bearing and slide
the bearing from the end of the
Photo 15 hopper and off the developer roller.
Step 12 (See Photo 18)
Apply a small amount of padding powder to
the drum. Install the spring on the small gear
side. This spring is to prevent the drum from
turning backwards. Place the drum into the
waste hopper. Slide the drum axle through the Photo 18
drum starting from the large (contact) gear side
of the waste hopper.
(See Photo 15)
Install the “C”clip onto the drum axle.
Photo 16
Step 13
Using a Philips screwdriver remove the screw
that holds a chip to the waste hopper.
(See Photo 16)
Install a new chip.
Set the waste hopper aside in a protected area
out of the light.

4. 4 Lexmark T420/430 Technical Instructions
Photo 19
Step 16
While holding the shaft of the developer roller,
lift the roller out from the hopper and slide the
Notes developer roller axle out from the toner hopper
gear end plate. (See Photo 19)
Step 17
Remove the Teflon shims from the developer
roller and inspect them for damage and wear.
Replace the Teflon shims as a set if necessary.
Photo 20
Step 18
Turn the toner hopper to the right so the fill plug
is facing you. Using a small flat blade screw-
driver, pry out the toner fill plug carefully and try
not to damage it. Clean the filter inside the fill
plug with either vacuum or compressed air.
(See Photo 20)
Photo 21 Step 19
Dump out the toner from the toner hopper.
Using dry compressed air or a vacuum clean the
toner hopper. Be very careful not to damage the
toner hopper sealing blade.
(See Photo 21)
Photo 22
Step 20
Using a cotton swab and Isopropyl alcohol,
clean the developer roller end seals.
(See Photo 22)
Photo 23 Step 21
Clean the contacts of the toner hopper using a
cotton swab and Isopropyl alcohol.
(See Photo 23)
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5. Lexmark T420/430 Technical Instructions 5
Photo 24
Step 22
Clean the underside of the doctor bar with a
cotton swab and isopropyl alcohol.
(See Photo 24)
Notes
Step 23
Visually inspect the inner sealing blade. If the
blade is damaged it will cause leaking and
must be replaced.
Photo 25
Step 24
Clean the developer roller with a compressed
air. Place the axle of the developer roller into a
drill. Take a lint free cloth, add a small amount
of alcohol, then soak the cloth with water.
Clean the roller using the lint free cloth while
the roller is rotating in the drill.
(See Photo 25)
Photo 26 Step 25
Clean the developer roller shaft with a cotton
swab and alcohol. (See Photo 26)
Photo 27 Step 26
Install the Teflon shims on each end of the
developer roller and slide the keyed end of the
developer roller axle into the gear assembly
end plate. Lower the other end into position
being careful not to damage the Teflon shim on
that side. (See Photo 27)
Photo 28 Step 27
Using a small flat blade screwdriver or needle
nose pliers pry the developer roller contact off
the developer roller shaft and install the brass
contact bearing onto the end of the developer
roller shaft. Slide it into place on the end of the
toner hopper.
(See Photo 28)

6. 6 Lexmark T420/430 Technical Instructions
Photo 31
Step 30
Place the waste hopper top down on the work
bench with the waste hopper away from you.
Step 28 Turn the toner hopper upside down, install the
left side of the toner hopper first.
Reinstall the doctor bar tension
spring so the“V” stamp on the While holding onto the toner hopper with your
spring points away from the toner left hand, carefully bend the waste hopper
hopper. (See Photo 29) away from the gear side of the toner hopper
using your right hand. Push the right side of
the toner hopper toward the waste hopper.
(See Photo 31)
Photo 29
Photo 32
Step 31
Using a spring hook reattach the tension
springs to each end of the toner hopper.
(See Photo 32)
Photo 33
Step 32
Step 29 Install the developer roller drive gear onto the
developer roller axle. (See Photo 33)
Fill the toner hopper with the
The cartridge is now ready to test.
correct amount of toner and
reinstall the toner hopper fill plug.
(See Photo 30)
NOTE: The difference between T-420 and
T-430 cartridges is a notch in the center of the
front side of the T-430 cartridge waste section.
(See Photos 34 and 35)
Photo 34 T-420 CARTRIDGE
Photo 30
Photo 35 T-430 CARTRIDGE
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