The cause is IU all the way. Black IU is complex and heavy and sometimes it gets damaged while transported. The problem is the distance between developer brush and drum gets uneven in front or sometimes in back side. Causing developer brush and drum to contact each other. Then developer splits. Just replacing the IU will solve the problem.
Imaging Unit K - image quality problem
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Definately faulty IU and loss of bias contact at the rear of the unit as per my previous post. Latest info is that the K IU`s have been modified in production since Feb 2010 (look for a green dot next to the lot number) and a proper locking bracket is going to be fitted to stop the IU`s moving forward in use. Lets see if this is a fix...
The P14 code can normally be cured by firmware update and skew readjustment.Comment
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Hey, that's great news! Just had a call today on that same C550. Having black streaks and image offsetting. I couldn't reproduce the problem, this time. That bought me a little time! Thanks a bunch!!!Comment
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SOLUTIONS SUPPORT DIVISIONBulletin Number 7370Date:03/29/10
From:SSD
Subject:Dirty Images, Black Developer Spew - MANDATORY CHANGE
bizhub C451:073 bizhub C550: 082 bizhub C650: 066
SYMPTOMIn some cases, prints may be either partially or completely covered by excess toner, creating a dirty
appearance. At the same time, developer may have spewed into the machine.CAUSEPoor electrical contact of the charge terminal at the back of the IU results in improper operation of the drum
charge control. This causes too much charge to be applied to the drum, resulting in dirty images. Poor contact
can occur if the IU is not seated firmly and securely.SOLUTIONInstall a new lock plate to secure the black IU in the correct position. Fasten it with
the existing screw that is used for the sub toner hopper as shown.
This lock must be installed on all of the machines listed on the next page. Refer to
the Important note on the next page.
Page 2 of 2 Bulletin Number 7370CUSTOMER INSTRUCTIONFor those instances where a customer, rather than a technician, replaces the IU, you must show the customer
how to remove and reinstall the lock plate when the replacing the IU. A magnetized screwdriver is required.SERIAL NUMBER INFORMATIONModel Serial No.
C451 All
C550 All
C650 AllPARTS INFORMATIONDescription Part No.
Lock Plate for black IU A00JP33100
IMPORTANT: Effective March 29, 2010, warranty claims for black Imaging Units for these models will not be
processed unless a Lock Plate has been ordered for that serial number. Determination will be made by
comparing the Warranty Claim serial number against the shipments of Lock Plates.FOC PARTS ORDERING PROCEDUREFree-of-charge (FOC) Lock Plate p/n A00JP33100 can be ordered via the Online Technical (FOC) & Special
Program order form, located within MyKonicaMinolta.com (Serviceโ Warranty, Repair & Special Programs).
*FOC parts for this program will be available for units that are within the affected serial number range as
mentioned above. These FOC parts will be available from March 29, 2010 to July 31, 2010.
Upon our receipt and verification of your online claim information, KMBS Service Operations will process a
Free-of-Charge order. All replacements will be shipped via UPS Ground Service. As mentioned above, KMBS
will ship all Lock Plates at no-charge. Therefore, no invoice will be generated. No defective parts are to be
returned to KMBS for this specific FOC Program.
Questions related to your FOC Lock Plate claims may be directed to KMBS Service Operations at (201) 934-
5339.
Thank you for your continued support of Konica Minolta Business Solutions, Inc. products.
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You have till July 31st to get these in as you see in the most important quote of this bulletin:
"IMPORTANT: Effective March 29, 2010, warranty claims for black Imaging Units for these models will not be
processed unless a Lock Plate has been ordered for that serial number. Determination will be made by
comparing the Warranty Claim serial number against the shipments of Lock Plates"
We have ours and I am heading out to install these shortly that explains why I had enough buildup inside my c650 where it fell on the write glass.
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