Re: Large pdf(40MB) with 600 pages color quality is poor if i print more than 1 or 2 pages at a time.

I think we can be pretty sure that Acrobat is sending the same information to the printer (per page)  whether you print one page or many. So this is certainly something to loo kat in the printer. Could be memory, or even a physical effect as the printer warms up. Definitely contact Konica Minolta.