The developer fan (located near the back of the machine in the center. It appears that it cools the developer unit) will run normally during copying/printing but goes into a pulsating mode a few seconds after copying is done. Fan speed goes up and down in about 3-5 second intervals, never ending. I changed the fan, the engine board and power supply with no effect. I think that leaves the main board with all of its settings, something I would dread doing. Any ideas? Thx john
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