What do you want to recalibrate. have recently had the Developer and drum changed? Bizhub 250 is good machine adjusting the gray scale is printing out the Go to admin setting printer setting ,test prints print's a gray scale and bird picture along lazy brown fox saying.
Btw, I’m available to help over the phone in case u need at
https://www.6ya.com/expert/normanj_7893313f0751935f
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