I had a bad 993 once and tried an extra supply to see if it was the supply that went bad. I ended up with two bad supplies with blown fuses and a bad 993. I sent the 993 in and it came back intermittent. But this time it just went dark without blowing a fuse. That time it turned out to have a bad (intermittent) full wave rectifier which I replaced. It's been good ever since.
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