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My first thought is your 5v power is low, causing your MPU to boot slowly. On DE machines, I’ve seen this happen and it blows F5 because the MPU holds a signal for the driver circuit too long during boot. Using the test points on your power supply, test for the 5v supply (dc). If you’re a little low, that may be your problem.
If 5v is okay, disconnect the output of the ppb board and see if the fuse blows then. If it does, you have a problem on the ppb board.
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