JRC JMR-92 Series Field Service Manual page 340

Step 6 Replace the modulation unit.
Install the magnetron that was removed in Step 3 to the new modulation unit.
Then, reassemble the unit by following the disassembly procedure in the reverse order. Do not
forget to tighten the bolts or screws, and do not forget to reconnect the cables.
Magnetron
Step 7 Operation check
After completing the replacement work, turn On the safety switch and 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 radio 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 modulation unit replacement.
Chapter 4 Replacement procedure 4-120