No ideas, really, but I never had this problem with mine. Bummer!
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i don't have this problem either. what type of cart do you use? as i'm sure you know, the pe mode is only for low output mc's. it's not suitable for high output mc's or mm's. the only other suggestion i can come up with is(and i know it's not very clever) is pop the top and go in and double check that the jumpers are all connected properly, according to the directions. i have to use needle nose pliers to take them off and on because they're so small.
other than that, i would email dynavector ( email@example.com). i've done this on a couple of occasions and received fast replies.
good luck. the p-75 is a terrific unit. hope you get the problem fixed.