PPI horizontal gain display maladjusted.
Adjust PPI display on radar set AN/FPN-40.
a. Place the RANGE NAUTICAL MILES switch S1501 to SEARCH 40,
located on SN-386/FPN-40.
b. Adjust SEARCH VERTICAL CENTERING control R1504 and SEARCH
HORIZONTAL CENTERING control R1505 to center the PPI display on the
CRT. R1504 and R1505 are located on SN-386/FPN-40 (Figure 50).
c. Adjust PPI GATE LENGTH control R1511 (Figure 47) so that the
display ends just after the 40-mile range mark (Figure 55).