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ldfan · **Posted:** 21 Sep 2020, 05:11

I looked over the pics for the last hour or so and I think these are the correct points.

SP1 = AC3-RF Out (to middle pin of RCA jack on back panel)
SP2 = AC3-RF Out GND (to GND of RCA jack on back panel)
SP3 = +5vdc
SP4 = Audio FM In
SP5 = Not used (possibly meant for a Mute Active Low player)
SP6 = Mute Active High
SP7 = -5vdc
SP8 = GND

However, I am not 100% certain about SP7 as the boards I have made I always sent -5vdc to the what would be the SQ1 transistor but this circuit design sends it to SQ2 instead (a possible reason is that this SQ2 might be an NPN type transistor and I usually use a PNP type on my boards).

If Kurtis could possibly confirm my analysis, we'll know for sure.

As for your adding the AC3-RF to your 97, here are the points as written up by invenio...

https://drive.google.com/file/d/0B3Or4auin9FnNkpJZE9KVTVzRFk/view

Good luck for when you get your 97 modded. I'll probably mod my 97 in about a year or so; too many other projects I need to work on ;).