Yeasu releases new Owner's manuals as the externals and user interface change. There've been maybe 5 or more released for the FTdx10 so far. Makes sense as more of the product becomes software defined.
In the FT-8x7 series, it was the service manuals that got released more often. Also, they've started to release what I think of as a "summary" release which includes every part, layout, and schematic change over the total production run of all models.
Last year, F1RVC posted the 817/818 release of the manual in this group at
/g/ft817/files/FT-817_817ND_FT-818ND_TS_USA_EXP_EU_E137790J.pdfYaesu cal them Technical Supplements.
You'll see that there were 4 different versions of the PA board. They're listed by lot number, not version. (the 817x and 818 versions are so close, they had continuous lot numbers)
Anyway, this is the manual to look at, as it succeeds ALL of the hardware changes over both production runs. Lord knows about firmware changes, though. those remain totally opaque.
Hope this helps,
Jeff kn8a
