I'm not sure which power supply you're using, but I suggest testing its output with a voltmeter before taking the D10's covers off. Since the D10 was always fed either by an internal battery or an AC power supply (either completely external, or else the kind that slips into the battery compartment), normally I would expect any fusing to be in the AC power supply itself. Otherwise the power supply wouldn't be protected from fire or shock hazard.
That said, why are you copying anything _to_ DAT at this point? It's a fragile, very unreliable long-term storage medium. If your sources are analog, I could understand using the deck to digitize them on a pass-through basis for storage on some other, more reliable and durable medium. But I just spent several weeks transferring all my old DATs to a pair of hard drives so that I could finally get rid of the DATs. It was very demanding, since I had to listen carefully the whole time; dropouts and gronches could occur at any moment. Some tapes couldn't be played back at all without audible errors, and I have four different decks including a TCD-D10 Pro prior to the II model--but to my surprise, a TCD-D8 gave me more reliable results.
Anyway, maybe you have some extraordinary reason to be recording on DAT, but if so, I'm really curious to know what it is. I was very glad to put the entire medium behind me for good, and to see someone say that they're recording _to_ DAT puts me in mind of the old ad campaign about how "friends don't let friends drive drunk."