JRC JMR-92 Series Field Service Manual page 494

Step 7 Operation check
After having completed the replacement, check operation by following the procedure below.
(1) Turn On the Display unit. After the countdown is completed, start transmission and check
that the radar image appears without error.
Transmit the radar wave in long pulse range mode and open the service engineer menu
to check that the magnetron current stands between the 5th and 7th calibration
markings.
This completes modulator circuit board replacement.
4.2.1.3 Modulator (NMA-552) Replacement/NTG-3225
See Section, "Magnetron replacement/NTG-3225".
Chapter 4 Replacement procedure 4-274