Here's what I've done. Swapped with known good components from a working machine: All memory, controller power supply, op panel. Tried disconnecting and installed new HDD. Removed fax and NIC. No peripherals connected. Unplugged transfer connector.I tried to force a firmware update, no joy. None of these things have worked, still SC 672. Question: Can I remove the system sd card from a working mp5500 and try it on the broken mp7500 without screwing up the sd card? I'm running out of things to try before ordering a new controller. Any suggestions would be appreciated.
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