Can anyone tell me what these TL07C are for?

Post #3: It's used in the protection circuit. Pin 14 controls the differential current switching. My 801 diagram is unreadable. The 501 is close enough to see what they're doing.

#4:
Those are not as they should be. Copy and paste this list and the DC voltages on all pins of that IC. Confirm that you are using a good ground for the meter.


Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
 

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