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uedele
11-16-2011, 08:28 PM
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.

RRodgers
11-16-2011, 09:07 PM
Yep. Install the mod.

EarthKmTech
11-17-2011, 11:11 AM
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...

habik
11-17-2011, 05:05 PM
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...

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..## cheers

minimerlin
11-17-2011, 08:15 PM
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..## cheersHave you fitted the mylar mod to the transfer plate? That is usually the cause of the ghosting on these animals!

emujo
11-17-2011, 08:31 PM
Poor bias contact (mod might solve) and loss of drum drive will cause developer dump. Emujo

habik
11-17-2011, 09:20 PM
Have you fitted the mylar mod to the transfer plate? That is usually the cause of the ghosting on these animals!


The mylar strip on transfer if this is almost the shape > UuUuUuUuUuU <

has been fitted since the beginning, unless someone did not fitted it properly.

habik
11-17-2011, 09:24 PM
Poor bias contact (mod might solve) and loss of drum drive will cause developer dump. Emujo


MOD been done, NEW IU in place. So far so good. Customer happy for the last 3-4 months, Hope I did not jinxed it:)


How loss of drum drive can actually happen? Not sure if I am folowing.

Thanks Emujo for explanation.

EarthKmTech
11-17-2011, 10:32 PM
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.

EarthKmTech
11-17-2011, 10:37 PM
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..## cheers

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.

uedele
11-18-2011, 09:27 PM
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.


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.

EarthKmTech
11-18-2011, 09:31 PM
are there any burn marks on the HV contacts on the back of the failing IUS ?

uedele
11-18-2011, 09:44 PM
are there any burn marks on the HV contacts on the back of the failing IUS ?

no not that i can see. at times the mc comes right by itself. heard those k image units r a bit temperamental.

Imsdal
11-24-2011, 02:39 PM
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!!!!!

EarthKmTech
01-19-2012, 09:34 PM
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...

an update, the machine destroying yellow iu's come back again, this time after 800 minutes :rolleyes:

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.

habik
01-19-2012, 10:51 PM
an update, the machine destroying yellow iu's come back again, this time after 800 minutes :rolleyes:

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.



1,Have you changed the gears for Transfer belt cleaning? I had one of them to go and went of with a grinding noise, yours may be on the way but without the grind as yet.
relevant post:
http://www.youtube.com/watch?v=uSP5ZlOKZxs


2,Do you re-fuse TB or getting new each time, as there is no blade only softpad-strips and rotating brush, I think they last only 1 lifetime.

EarthKmTech
01-19-2012, 11:18 PM
I'm 99% certain the cleaning gears are a-ok, i visually inspected and it even has the later version wider gear. Also thr belt seems to be cleaning perfecto.

We dont extend the life of anything, unless its an emergency and theres no stock etc, this machine has always had new everything.

Btw, im yet to follow my own advise, im waiting for yet another yellow iu before proceeding. I will update if it works.

EarthKmTech
01-23-2012, 10:43 AM
the reason this particular machine is destroying yellow iu's has been discovered.

its the black iu believe it or not.

the yellow charge section is heavily soiled with black toner/dev which starts the destruction sequence.

the black iu was 3 days old and already spilling dev at the rear side and it was being tracked along the belt and the on top of all the ius. (and yes, they're always installed correctly with the locking plate and there are never burn marks on any of the hv contacts)

the machine has today received, 4 new ius, new transfer belt and roller, new HV-1 board, all now locking levers & a waste toner drive section for good measure (incase it was leaking, which it wasnt)

I will return in 1 week, if the black is spilling again the machines going to the crusher.

Mooseface2r
01-23-2012, 01:00 PM
weve had this a couple of times, the mod plate seems to have always solved it.

habik
01-23-2012, 03:06 PM
the reason this particular machine is destroying yellow iu's has been discovered.

its the black iu believe it or not.

the yellow charge section is heavily soiled with black toner/dev which starts the destruction sequence.

the black iu was 3 days old and already spilling dev at the rear side and it was being tracked along the belt and the on top of all the ius. (and yes, they're always installed correctly with the locking plate and there are never burn marks on any of the hv contacts)

the machine has today received, 4 new ius, new transfer belt and roller, new HV-1 board, all now locking levers & a waste toner drive section for good measure (incase it was leaking, which it wasnt)

I will return in 1 week, if the black is spilling again the machines going to the crusher.

Try to lower the 1st transfer on Bk by 5.

Synaux
06-13-2014, 05:28 AM
We dont extend the life of anything, unless its an emergency and theres no stock etc, this machine has always had new everything.


Was just browsing and saw this old post. Just out of curiousity, what do you do with the EOL parts?
Mail em to me if you are just trashing them! :P

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