This sound amp is used on cyberlead cab, and few other namco arcades.
Seems to be little confused with what in/outputs are usually on amp boards, but baisicly talking,there are atleast three or four.
1 input
2 output
3 power
4 volume
If, other than them, should be low-pass amp(bass woofer) in/output, or different inputs in various channel,even for mic, whitch depends on each pcb structure.
There will be three connectors on this pcb, as it is, since volume is directly on it already.
"J1" RCA sound input
"J2" speker output
"J3" power (+12V)
For 2pins "J3" power connector
1 +12v
2 GND
I'm not sure about speaker outputs, 'cause don't have manual with me now, but I think....
For 4pins "J2" speaker output connector
1 L+
2 L-
3 R+
4 R-
tips: If you don't have manual, and can't determine pin assign, there will be a common way to find out by reading out circuits printings on both sides of pcb and also what's written on the board,that's if any. As you can see the pic posted, there are "L/R" and also "1" on the sides of "J2"connector, whitch shows that all pins are numbered from 1 to 4 from the left end, determined from the printing"1" on the left side of connector, and 2 pins on the left sides will be ether +/- of LEFT speaker output from the "L" printings on the left side of connector, same to the "R". To determine which is +/- on this one, look into circuit printings on the back side of pcb. I forgot witch pin is +/- on it, but if you'd post another pic from the backside, it would be helpful.
