Just documenting the FG MK2 Subwoofer & AMP...
So I had exposed the Premium ACM's Subwoofer AMP pins for use later:
I had searched ebay for an AMP, I made sure it came from an FG2.. I had also started documenting the FG2
ICC schematics - which are identical to the FG(1) so I was confident.. until I got this:
My first thought was, hmm - there's more pins in C-66 (here) than I expected! I double checked the service manuals - nope, there's nothing like this connector. I searched the Internet, no mention about the FG2 using a different unit. I rechecked ebay, a few different sellers have this unit for sale saying it's from a MK2.
The part number of a FG's AMP is 8R29-18T805-AA but mine is BR29-18T805-AA. The FG also has many more markings - A Sanyo Automedia model. Mine has no other details - so I opened it. It said E8 SONAVOX 2011-DEC-REV 1.2
I traced the pins to various areas of the circuit, worked out the main things pretty quickly (power, speaker, audio-input) but two pins were a bit different. I had guessed incorrectly initially and got a bunch of codes in Forscan, but retried with it as follows and got it working. C-66 as I've drawn up top is from an FG - my paper note sitting on top is what I have connected now:
(The +5v Turn-On note is just something I had tried on the bench, and it powered up and I got sound.)
I assume positive/negative (speaker output and audio input) is "+ to -" (left to right) and "+ to -" top to bottom. Happy for that to be confirmed though
Edit: Oh, and it pretty much needs constant +12v power (not from the Cigar socket on accessories) otherwise you may get Forscan codes saying it's lost connection to the AMP.