c. Voltage (Figure 3) at pin B of J22 is applied to P1 pin B of the J-
3513 junction box, then through J-3513 to J7 pin B. J7 pin B applies the
voltage to pin B of cable CX-4723 to the AM-1780. (Trace this circuit on
your system diagram.)
DC voltage path from pin B of J22 to AM-1780.