JRC JMR-92 Series Field Service Manual page 390

4.1.6 NKE-2103, NKE-2103-HS Scanner Unit
4.1.6.1 Magnetron Replacement/NKE-2103
When replacing magnetrons, make sure to shut off the main power and
let the equipment stand for more than 5 minutes to discharge the
high-voltage circuit.
Failure may result in electric shock.
Make sure to take off your wristwatch when your hand must get close to
the magnetron.
Failure may result in damage to the watch since the magnetron is a
strong magnet.
Cautions on handling the magnetrons that have been stored for a long
period of time
Since the magnetrons that have been stored for a long period of time may become unstable at the
start of the use due to the occurrence of spark, etc., apply aging by using the following procedure.
1
Extend the preheat period. (Standby: 20 to 30 minutes)
2
Start from the short pulse range and shift to the long pulse range sequentially.
If the operation becomes unstable during this period, return to Standby immediately, maintain the
status for 5 to 10 minutes and start operation again. Repeat this procedure.
Chapter 4 Replacement procedure 4-170