i rechecked see comments underlined below.
You shouldn't have any waveform on the scope with one probe on 5 and the other on 8.
There are resistors between the output of one op-amp and the input of the other. Jumping them may not tell you much. Did you check the resistors R402 and R404?
Yes, they checked good out of circuit, I replaced them, the sine wave is on the "incoming side" of both resistors from the other opamp (closer to the edge of the PCB). the sine wave is distorted on the other end of the resistor (side connected to pins 2 and 3 of the opamp closer to the optocoupler).
When the optocouplers are out of the circuit, you have to jump terminals 5 and 6/7 to prevent excessive draw from the output stage.
I haven't done this, but ill keep in mind if the need arises.
When checking for signal on the output of the optocouplers, you have to place the black probe on 5 and the red on 6.
Doing that ^ do you see the 45Hz signal on the optocouplers when you have the 45Hz signal on their input?
Black probe on 5 and red on 6, i get a square waveform that comes and goes very quickly. (optocoupler closest to the edge of the PCB)
Earlier, you had 18v+ across 5 and 8. Why only 12.6 now?
I'm not sure all I've messed with thus far are both optocouplers and opamps.
Where is ground on your scope photos? Generally, there is a marker but yours has 2 markers.
The left marker is the ground
Is the scope on DC coupling?
Yes
You shouldn't have any waveform on the scope with one probe on 5 and the other on 8.
There are resistors between the output of one op-amp and the input of the other. Jumping them may not tell you much. Did you check the resistors R402 and R404?
Yes, they checked good out of circuit, I replaced them, the sine wave is on the "incoming side" of both resistors from the other opamp (closer to the edge of the PCB). the sine wave is distorted on the other end of the resistor (side connected to pins 2 and 3 of the opamp closer to the optocoupler).
When the optocouplers are out of the circuit, you have to jump terminals 5 and 6/7 to prevent excessive draw from the output stage.
I haven't done this, but ill keep in mind if the need arises.
When checking for signal on the output of the optocouplers, you have to place the black probe on 5 and the red on 6.
Doing that ^ do you see the 45Hz signal on the optocouplers when you have the 45Hz signal on their input?
Black probe on 5 and red on 6, i get a square waveform that comes and goes very quickly. (optocoupler closest to the edge of the PCB)
Earlier, you had 18v+ across 5 and 8. Why only 12.6 now?
I'm not sure all I've messed with thus far are both optocouplers and opamps.
Where is ground on your scope photos? Generally, there is a marker but yours has 2 markers.
The left marker is the ground
Is the scope on DC coupling?
Yes