Six months ago I replaced all imaging units on our Phaser 7400 (black, cyan, yellow, magenta). These units have previously lasted 18-24 months on this machine. Black streaks are appearing on print outs and our printer technician believes we need to replace the black imaging unit. The imaging unit installed 6 months ago yields 30,000 pages and we are nowhere near this usage. Why would a black imaging unit run out so quickly???
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