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It could be a defective SD card or even the SBC PWB. If you have another known working WC7855 you can try to clone the image of the SD card, otherwise you must buy a new SD card ( part no. 237E27210).
Hello, I have the same problem with my Xerox WC 7845. SD card is corrupted. Can somebody help me with image of SD card? my e-mail: email@example.com