Panasonic® KX-P4450 Developer Unit Remanufacturing Instructions...
1
Panasonic® KX-P4450 Developer Unit
Reference Information:
OEM PN:
KX-PDP1
OEM Yield: 20,000 prints (5.5% image area)
(10 pages repetitive printing)
Operational Theory (Figure 1):
The developer unit holds approximately 320 grams of developer in the mixing
unit. The developer is a mixture of toner and carrier. The mixing paddle rotates
clockwise to stir the developer which creates a friction charge called a tribo-
electric charge. The toner is negatively charged and the carrier is positively
charged. The magnetic roller consists of magnets mounted inside a rotating
aluminum sleeve. The sleeve rotates at 80rpm and the magnets inside attract the
developer to the surface of the sleeve, forming a magnetic brush. A doctor blade
mounted in the developer housing trims the brush to 1.0mm. Where the magnetic
brush lightly touches the drum, the negatively charged toner is attracted to the
latent image on the drum. The latent image is then converted to a visible image
on the OPC drum. A bias voltage is applied to the sleeve to achieve maximum
Figure 1
print quality. Any developer remaining on the sleeve is removed by the scraper
and returned to the mixing paddle for new toner. A toner barrier catches loose
developer which is then re-attracted to the magnetic roller.
The developer first-use sensor is used to tell the CPU when a new developer unit
is installed. An electronic counter on the logic board tracks developer life. At
20,000 prints, CHANGE DEV U26 is displayed.
Approximate Remanufacturing Time:
30 min
Recommended Tools:
Phillips head #1 screwdriver
Flathead (3mm) screwdriver
Soldering iron and wick
Figure 2
CAUTION: Do not test your unit with the new fuse board installed. Your
printer will blow the fuse. Test with the old fuse board then install the new
fuse board. This will insure that your customer's page counts are properly
reset.
Instructions (Figure 2):
1. Remove the developer unit flange (3 screws).
2. Remove the toner density connector (2 screws).
3. Remove the developer unit top cover (5 screws).
4. Remove the old developer from the mixing paddle area and the magnetic roller
Figure 3
sleeve. Be sure to remove all the old developer.
5. Locate the toner density/developer first-use sensor unit on the bottom of the
developer unit. Remove the cover. De-solder the two center leads (Fig. 3) on
the green circuit board and remove the screw. Flip the green circuit board
over and remove the old fuse. Insert and solder new fuse. Secure green cir-
cuit board to developer unit and replace the cover.
6. Refill the developer unit with new developer. Spin the magnetic roller sleeve
gear counter clockwise to coat the sleeve. (Note: Spin the roller so that it
comes out of the bottom and into the top of the unit).
Figure 4
7. Re-assemble in reverse order (3,2,1).
Note:The magnetic roller has an angle of graduation adjustment for (Fig. 4) print
density. When using Oasis 4450 developer perform the following steps:
Oasis Imaging Products, Inc. Technical Support: (888) 627-6555
2
a. Loosen the adjustment screw on the magnetic roller through the flange.
b. Set the pointer to the mid-scale position.
c. Tighten the screw (be sure that the pointer does not move).
d. Watch your test prints very carefully.
NOTE: If you notice a grainy feeling to the paper or any scattered dumping on the
page, stop the test immediately. Remove the developer unit and adjust the
pointer again (clean the printer if necessary). Move the scale so that the pointer
is one notch to the right of center. Continue this process, making fine adjustments
until you are able to run 20 to 25 clean crisp prints. It is very common to print 75
to 100 test pages per developer unit. Be sure to make your adjustments in small
increments (no more than one notch at a time.
© 2001 Oasis Imaging Products, Inc. Any attempt to reproduce any part of these instructions without the written consent of Oasis Imaging
Products, Inc. may result in legal action. All registered trademarks are the property of their respective owners.