JRC JMA-5212-4/6 User Manual page 424

How to replace a 25 kW antenna magnetron
Make sure that all radars are turned off before replacing the magnetron (if there are multiple radar devices, turn
them all off). It is also recommended that the breaker be turned off for safety.
Step 1: Turn off the antenna safety switch.
Step 2: Remove the cover.
OFF Safety switch
Hexagon bolts (4 places)
8 29
When replacing a magnetron, make sure
to first turn off the antenna safety
switch.
The switch is at the rear bottom of the antenna.
Turn off the switch.
The magnetron is placed on the right hand side
(starboard side) of the antenna. Therefore,
remove the right cover.
The cover is fixed with 4 hexagon bolts (M8
Captive Screw).
Place the cover in a safe place.
Prevent dust from being attached to the gasket.