b. Connect a multimeter between ground test point TP1514 and the -6 V
DC test point TP1509. Use the 10-volt scale on the multimeter. Slightly
adjust the -6 V DC adjustment control R1610 counterclockwise and then
clockwise while observing the multimeter (Figure 31).
What effect did adjusting the -6 V DC adjustment control
R1610 have on the multimeter?
c. Adjust the -6 V DC control R1610 for a multimeter indication of -6 V
DC (Figure 31).