What is going on with HifiEngine?

After some more digging I've found the same schematic of the Technics ST-3500 in a higher resolution on some Japanese website. I've attached it here for other people.
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I am yet another US person (KC) who cannot successfully access hifi engine registration after multiple attempts with and without VPN and across different browsers. I just purchased and I'm awaiting delivery this week of a used JVC td-v66 cassette deck after discovering my stored akai deck was dead and not readily repairable by me. I'm an old guy who lived with nice hi-fi equipment in the 70s that I got in the army px while stationed in Germany. I have about 50 cassettes that I am wanting to convert to wav files via my desktop computer. I'd really be grateful for a download of the owners manual for this deck from: https://www.hifiengine.com/manual_library/jvc/td-v66.shtml

Respectfully,
-Doug