K92X0343A wiring help.

[Hackcell]

Hello,

I've been looking for the wiring diagram of the Taito Optical VR amp (J9200194A). AFAIK, Puzzle and Dragons dedicated machines came with this amp, however, I couldn't find any manual.

 

[Bigblue709]

FYI: there are at least two revisions of this board, K92X0343C and K92X0328A. Different dip switch and different optical input jack, no other visible differences as far as I can tell. This is from the Love Live schematic which was posted here recently.

 

[Bigblue709]

Found this photo on YAJ a few weeks ago

 

[Bigblue709]

The 3.5mm jack appears to be connected to pins 24,25 on the amplifier IC which would indicate that it’s a DAC output. No idea what’s safe or unsafe to plug in there as my audio knowledge is rudimentary at best.

Minimum speaker load impedance is 5.4 ohms, a bummer for all my fellow Capcom CSP-001A owners