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Alan,
Don't panic. This is probably recoverable. Unfortunately (and stupidly) many mounts don't have reverse polarity protection. I have the Takahashi clone of the EQ6, the EM200 which also doesn't have reverse polarity protection. I check by using an indicating 12v cable. After checking that I've connected the battery terminals as i connect, I next look for the green led on the cigarette plug, before I plug it the other end into the mount.
Now to your problem:
First check for fuses in the power supply and the EQ6.
Is the power supply still producing 12V?
If the power supply is working and all the fuses are in tact, you have most likely blown on or both voltage regulators rather than blown the whole thing. So you might have to change one or both of the voltage regulators labelled, U9 and U10 on the MC007 board.
Worst case, buy the board replacement kit from SW and replace the whole board but try the regulators first.
Good luck
Joe
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