Adjust the 1500 CPS voltage level of radar set AN/FPN-40.
a. Place the REMOTE-LOCAL switch S-4203 on the control monitor chassis
to the LOCAL position (Figure 9).
b. Depress the HIGH VOLTAGE OFF button S-2304 on power supply PP-2489/
FPN (Figure 8).
c. Unlatch the release handles and pull receiver chassis forward.
Pull receiver R-981/FPN-40 out far enough to gain access to
the 1500 CPS level control and 1500 CPS test point TP-3001
d. Pull out the INTERLOCK switch to restore power to the R-981/FPN-40