Had an interesting error on a 7551ci recently, The machine shows F041Communication error between Main PWB and Scanner engine, oddly the power supply for the scanner ISC PWB comes from the Power Supply board used for the LCT cassettes, located at the rear of the LCT trays, rather than the main power supply board located at the rear of the image process area.( as you would assume)
Hope this saves you a bit of time one day.Capture2.JPG
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