Small spots on middle third of paper

[igenderby]

I have a problem with small spots on an iGen3 in the middle third of max size paper and sra3. They look like a dot of toner with white edging round it. There are probably 30-40 on a sheet and are size of a pin head.
They are pre-fuser as panic stop shows them on unfused sheet.

Any ideas would be welcome.

Thanks

 

[ddigen3]

Any chance you could email me a digital picture? I've seen quite the variety of oddities on press. I'd like to see it specifically.

igen [AT] dailydigitalimaging [DOT] com

 

[igenderby]

hi,

engineers have managed to track down the problem as low airflow through corotrons on two stations.

Seems to be cured apart from odd spot now and then,

many thanks