Grayscale print job is intermittently producing pages tinted yellow. 100 pages or so will print correctly, then 50 pages or so will have a faint yellow tint -- looks like the paper was washed in a very pale yellow. Then another 100 - 200 pages will print correctly, then another batch of yellow all within the continuous printing of a 2500 page job. The intensity of the yellow increased as the job progressed. The later two sets of yellowed pages showed a faint yellow spot pattern repeating across the page -- as if there was a spot on a roller that was depositing yellow toner. I shut the printer down overnight, then retried next day with same result.
Supplies status shows all toner and image drums OK, although Cyan, Magenta, and Yellow drums are down to 8% remaining life.
Equipment is HP Color LaserJet 9500 MFP with stacker/stapler finisher. Put in service approximately 1 year ago. Used infrequently for large jobs in small office environment. Total page count is about 60,000 pages, some color and some B&W. Fuser replaced after 45,000 pages to correct a 50.1 fuser error. Latest problem presented itself a few days ago while printing one of several large (2500 pages) jobs. Print content is Adobe PDF grayscale. Medium is 8.5x11 20 lb 3 hole pre-punched white paper.
Any help?
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