MPC4503 Print out dirty dot dot at center

[Pixtech Frameworks]

It can be caused by the following:
1. Dirty transport roller
2. Paper exit roller
3. Cleaning blade (black developer unit).
Cleaning 1&2 with wet cloth (water)
4. Bad opc drum

[Mark Bbb]

Please,
mention counters of
pcu (unit or parts?), developer(box), F.U., paper transfer, ITB (cleaner).
Do you use original Ricoh parts?
Do you rebuild the pcu yourself?
So many questions, so little info !!!

[Gab]

Are =these dots when copying?
Do some repeated A3 copies . Are those dots repeated at regular spaces (as it looks like ) ? If yes the problem is at drum or developer roller or charge or upper fuser. To find which item you mesure the distance of the dots and compare this with the around of the cylider (drum or charge or.....)

[luca72]

Hi MPC 4503 Print out have dirty dot dot at center, Pls Help

*already change c m y k drum and heater unit

unfortunately despite having enlarged the photos, it is not seen very well, it does not look like the development groups (spots too large), to me it looks like the sleeve film cremated, in fact if you look at the black pattern the dots are almost white, as if the toner peeled off the sheet to stick to the film, you do some "output check" of the fuser without opening the toner bottle door?

[fshead]

stop the printout b4 it goes thru fuser and inspect......

[mga]

I interchange them all the time. P/N is different but they fit and work fine. I use the 04 series drum in the 03 too. They are cheaper. Dev units are unique though.

Sent from my LM-V405 using Tapatalk

The black pcu will not fit a colour. and yes 04 pcu's fit in 03 black 04 in black 03 and color in colour

[skinnyb]

The black pcu will not fit a colour. and yes 04 pcu's fit in 03 black 04 in black 03 and color in colour

I don't have any issues with it. Have done many times. I don't do it unless I'm in a pinch but sometimes you do what you have to do.

Sent from my LM-V405 using Tapatalk

[mikadonovan]

After looking at it under magnification, it's most likely caused by one of these things. K drum, failing fusing sleeve, or a buildup on a really effed up pressure roller. I know you said all have been replaced, but that's still what I see. Problem appears to repeat every 3 inches or so. All of these things are really easy to check with your eyes, no swapping necessary.

[mga]

Seen it more and more new drum kit fitted or rebuild non oem pcu
Buy cheap pay twice

[tsbservice]

stop the printout b4 it goes thru fuser and inspect......

This. Plus You're looking for something with diameter about 32mm. Print on A3 you should see the repeative patern(dots) 3-4 times. From your sample I guess the distance is about 100mm.