Photo 1 is the signal present on the jumper.
Photo 2 is the signal present on NE5532 Pin1 and Pin7 closest to the optocoupler. There is no audio present on any of the pins
The other NE5532 has a audio sine wave on the optocouplers Pin1 and Pin7
Photo 2 is the signal present on NE5532 Pin1 and Pin7 closest to the optocoupler. There is no audio present on any of the pins
The other NE5532 has a audio sine wave on the optocouplers Pin1 and Pin7
Attachments
I found a photo showing the op-amp closest to the optocouplers as U401. I'm going to refer to the first op-amp as U400.
U400, pin 7 drives U401 pin 3. If you don't see audio on U401, pin 3, post the DC voltage on all terminals of U401.
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
U400, pin 7 drives U401 pin 3. If you don't see audio on U401, pin 3, post the DC voltage on all terminals of U401.
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
I cant see any NE5532 marking numbers on the PCB, so I measured both.
NE5532 closest to the optocoupler:
Pin 1: -13.88v DC
Pin 2: 1.194v DC
Pin 3: 0.7v DC
Pin 4: -15.44v DC
Pin 5: -12.55v DC
Pin 6: -11.60v DC
Pin 7: -14.07v DC
Pin 8: 15.44v DC
Other NE5532:
Pin 1: audio signal (about 1.4v Peak to peak)
Pin 2: audio signal (about 0.8v peak to peak)
Pin 3: audio signal (about 0.8v peak to peak
Pin 4: -15.44v DC
Pin 5: audio signal (about 0.8v peak to peak
Pin 6: audio signal (about 0.8v peak to peak)
Pin 7: audio signal (about 1.4v peak to peak)
Pin 8: 15.44v DC
NE5532 closest to the optocoupler:
Pin 1: -13.88v DC
Pin 2: 1.194v DC
Pin 3: 0.7v DC
Pin 4: -15.44v DC
Pin 5: -12.55v DC
Pin 6: -11.60v DC
Pin 7: -14.07v DC
Pin 8: 15.44v DC
Other NE5532:
Pin 1: audio signal (about 1.4v Peak to peak)
Pin 2: audio signal (about 0.8v peak to peak)
Pin 3: audio signal (about 0.8v peak to peak
Pin 4: -15.44v DC
Pin 5: audio signal (about 0.8v peak to peak
Pin 6: audio signal (about 0.8v peak to peak)
Pin 7: audio signal (about 1.4v peak to peak)
Pin 8: 15.44v DC
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