Hi would like to know if anyone has had problems with these models dumping carrier(developer). It only happens on the black image unit. Tried a new one and done the same. dont know if those image units are temperamental, but sure are expensive.
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Re: c451/550
Yep. Install the mod.Color is not 4 times harder... it's 65,000 times harder.
They call it "TECH MODE" for a reason. I have manual's and firmware for ya, course... you are going to have to earn it. -
Re: c451/550
Had one recently with the mod destroy 4 x K IU's in the space of 1 week and it was the print head unit.
Another machine was constantly destroying yellow IU's within 300minutes and that was the print head on that one too.
no error codes, no visible defects. screwy...Comment
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Re: c451/550
Nice to know, cheers PerthKMTECH
Have you fixed it by switching the laser unit? or did you do any sort of adjustment to it. We have one too and it comes and goes with the effect of ghosting by few um to 2-5mm.
Thought new IU would fix the problem but it only improved a bit the actual ghosting. Some say HV unit.
Would love to know more..## cheersComment
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Re: c451/550
Poor bias contact (mod might solve) and loss of drum drive will cause developer dump. EmujoIf you don't see your question answered in the forum, please don't think it's OK to PM me for a personal reply...I do not give out firmware and/or manuals.Comment
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Re: c451/550
there's a bulletin on loss of drum drive for the K iu. from memory if its happening when resuming from power save mode theres an issue with the DC power supply.
I've seen the error persistantly a few times, but only when changing the K iu, from memory one of the possible causes is the drive coupling not going into the drum properly when inserting into the machine.
removal and reinsertion of the K iu fixed the issue on each occasion.Comment
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Re: c451/550
the issue disappeared after replacing the laser unit. There were no print defects visible or errors untill the IU's failed totally on both machines.
It was getting ridiculous and something had to be done. The print heads are VERY expensive so I'd be trying everything else first.Comment
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Re: c451/550
Thaks guys. Did replace print head and the loom to the k image unit connector. But still it was dumping dev. Funny thing it would b okay for 1200 prints then all of a sudden black dumping of dev on the page. looks like transfer belt that isnt cleaning anymore.Comment
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Re: c451/550
are there any burn marks on the HV contacts on the back of the failing IUS ?Comment
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Re: c451/550
SOLUTIONS SUPPORT DIVISION
Bulletin Number 7370
Date:
03/29/10
From:
SSD
Subject:
Dirty Images, Black Developer Spew - MANDATORY CHANGE
bizhub C451:
073 bizhub C550: 082 bizhub C650: 066
SYMPTOM
In 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.
CAUSE
Poor 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.
SOLUTION
Install 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 7370
CUSTOMER INSTRUCTION
For 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 INFORMATION
Model Serial No.
C451 All
C550 All
C650 All
PARTS INFORMATION
Description 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 PROCEDURE
Free-of-charge (FOC) Lock Plate p/n A00JP33100 can be ordered via the Online Technical (FOC) & Special
Program order form, located within MyKonicaMinolta.com (Service
→ 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
USE ORIGINAL TONER!!!!!Comment
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Re: c451/550
an update, the machine destroying yellow iu's come back again, this time after 800 minutes
there are a few known possible causes for yellow iu failure,
leaking waste toner from box/belt/waste toner auger assembly at left of yellow iu (it doesnt take much and it contaminates the yellow charge grid, starting the sequence of destruction)
insufficient locking pressure as per black iu (either replace the lock lever or install more pads)
defective transfer belt cleaner, waste toner again getting into yellow charge grid. (thin coating of waste toner remains on belt at all times)
defective hv board(s)
leaking toner from toner supply shutter, again, contaminating (which ever colour) charge grid.
if anyone has anything else to add, please do, this is becoming an epidemic.Comment
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