C552 colour print issues

[ECA]

Hi guys
ive got colour print issues. i tried to get a local tech out to me but they were useless when he turned up.

the colour dont align correctly. and it differs depending on which side of the page its on.

ive attached a test print for ref. test.pdf
as you can see the yellow and red are not aligned, but only at bottom of page.


also got yellow toner issue on one side of the page. again test print attached
yellow.pdf
some reason it only happens on the gradiant test print.???

ive replaced the yellow drum unit. but no go, still got problem.


some help please.

[copyman]

Re: C552 colour print issues

Do you know what the tech did? Did he do the gradation adj, etc? It could be several things, Image units, transfer belt, etc. You may have to bite the bullet and call Konica Minolta and tell them to send an old time tech that knows that machine. There is a possibility Kon/Min may say they are not working on that old model anymore but worth a try.

Best of luck

[ECA]

Re: C552 colour print issues

Do you know what the tech did? Did he do the gradation adj, etc? It could be several things, Image units, transfer belt, etc. You may have to bite the bullet and call Konica Minolta and tell them to send an old time tech that knows that machine. There is a possibility Kon/Min may say they are not working on that old model anymore but worth a try.

Best of luck

He didnt do much, just said to order a new yellow drum, cleaned some rollers. yet problems are still there same before he came.

ive been looking into the service mode, but little confused on how to do the adjustments.

how do you adjust the pattern to be inline, if its different across the page (one side ok, other side is out by miles)

[albemero]

Re: C552 colour print issues

It can to be the Sincro Roller hat probleme to move. A little spayoil on the Bearings can helps.

[ECA]

Re: C552 colour print issues

It can to be the Sincro Roller hat probleme to move. A little spayoil on the Bearings can helps.

where? you need to point this out to me.
ive got the field service manual.

whats with the yellow not working right on gradiant pattern, but ok on solid?

[copyman]

Re: C552 colour print issues

Sorry but this isn't something easily explained to an end user. This is beyond what an end user should attempt. This is why I said you need to call in a "qualified" and hopefully trained tech on that older model.

It's your call but if you want to dig deeper into this keep in mind most of times I've seen customers attempt these adjustments it ends up costing way more $$$ than if they just found a tech in first place!

Why not post if a tech on this forum is in your area and could do the call?

[jwai]

Re: C552 colour print issues

Try clean 2 color registration sensors?

[copyman]

Re: C552 colour print issues

Try clean 2 color registration sensors?

Agree about the sensors but assumed the tech would of done this. If you follow instructions in service manual end user should be able to remove transfer belt and clean the 2 sensors. Again there are risks doing this, i.e. damaging transfer belt, etc. Not saying it's real difficult to do just when you don't do something all the time it makes it much harder with risks! After cleaning the sensors do gradation adj. It's in the service manual

[emujo2]

Re: C552 colour print issues

Yellow isssues could be crap blocking the slit glass, registration issues...

1. Run Stabilzer
2. Run Gradation Adj
3. Run 8 color solid pattern
Replace related items for failures (PH, PCB, MFP board)

If this is an engine problem you need to perform
1. trail edge color adj
2. Color reg adjust
3. print head skew adj/reset
4. initialize and image stabilization again

If you get any codes during any of these steps you would trouble shoot by replacing the related component..As a fully trained tech, I would run from this problem..This machine is obsolete and parts are no longer available. E

[allan]

Re: C552 colour print issues

Print a simple demo page and post that. The first page shows some concerning artifacts like the random magenta lines.
Yea would agree with the laser glass on the yellow could be covered with toner.

[copier tech]

Re: C552 colour print issues

Hi guys
ive got colour print issues. i tried to get a local tech out to me but they were useless when he turned up.

the colour dont align correctly. and it differs depending on which side of the page its on.

ive attached a test print for ref. [ATTACH]44741[/ATTACH]
as you can see the yellow and red are not aligned, but only at bottom of page.


also got yellow toner issue on one side of the page. again test print attached
[ATTACH]44742[/ATTACH]
some reason it only happens on the gradiant test print.???

ive replaced the yellow drum unit. but no go, still got problem.


some help please.

I hope you didn't pay this tech sounds like he doesn't know this model at all.

Common issue on the C552 when the transfer unit is over life.

If you have cleaned the IDC sensors & printhead? (cleaning tool in tray 2) replace the transfer unit.

[MVPunisher]

Re: C552 colour print issues

I've seen this issue more than once be the actuator underneath the fuser have a broken tip on it. You have to remove the fuser to see this. I've also seen transfer belt, imaging units, dirty idc sensors cause this as well. Only once I have had to replace an idc sensor.

[ECA]

Re: C552 colour print issues

thanks for the replies guys

i have already taken this machine to part when i bought it years ago to get it up the 4 flights of stairs (it was so heavy)

anyway.
i have taken out the transfer belt before and cleaned it. and also replaced the fuser unit.

takes ages to find parts for this. yellow drum had to be bought from australia to uk recently.

im a tech guy, so can easily clean/remove etc. just didnt want to tweak settings that i dont know the effects.



i think the first thing is to find the sensors and anything broken. however can you please guide me to the locations, having a hard to finding in the field manual

link to field manual https://we.tl/t-LPMHdKD4dU


i find it strange that the yellow can do the solid page colour, but on the gradient colour is leaves gaps???

[ECA]

Re: C552 colour print issues

ok, i have removed fuser, removed transfer belt
found the idc sensors under belt removed them

cleaned all

now the colour align correctly. must of been the IDC sensors

only problem is the yellow is still missing on the gradiant print yellow.pdf

ive tried to clean glass with the pokey tool (although its very tight to push in)

any way to get to the glass?? cant access it when drums are all out.

[srvctec]

Re: C552 colour print issues

ok, i have removed fuser, removed transfer belt
found the idc sensors under belt removed them

cleaned all

now the colour align correctly. must of been the IDC sensors

only problem is the yellow is still missing on the gradiant print [ATTACH]44758[/ATTACH]

ive tried to clean glass with the pokey tool (although its very tight to push in)

any way to get to the glass?? cant access it when drums are all out.

Actually you can access the laser glass when the "drums" (actually IUs for the 3 colors on this machine) are out. With the Y IU out, run the cleaning wand into the proper place and watch from above to see it. I have a special tool (actually the charge corona cleaning rod from a EP2050) to apply pressure to the end of the cleaning wand to actually get the glass clean rather than relying on the super light weight of the end of the wand to do the cleaning. It's just a long small rod with rubber on the tip so as not to damage anything while using it in such a manner. I've even gone so far as to put on a brand new clean pad on the wand, put some methyl alcohol on it and then run it through, using my tool to apply a little pressure to really get the glass clean on stubborn dirt or film from a shop environment.