JRC JMA-9133-SA Instruction Manual page 417

JMA-9100 Instruction Manual
Use a non-magnetic screwdriver. If the magnetron comes into contact with any metal
(tool), its performance may deteriorate.
6) After having replaced the magnetron, reassemble the unit by following the disassembly
procedure in the reverse order.
Do not forget to tighten the bolts and screws, and do not forget to reconnect the cables.
Extreme care should be taken to connect the leads (yellow and green) to the magnetron
for prevention of contact with other parts or the casing. Contact may cause them to
discharge.
[Operation check]
After you have completed the replacement work, follow the procedure below to
check the operation.
1) Turn on the power supply for the radar. Allow sufficient time for the radar to be
preheated (about 20 to 30 minutes / bring the radar unit to STBY mode).
2) Start emitting radio waves from the short pulse range and gradually change the
emissions to the long pulse range. Open the service engineer menu to perform tuning
adjustment.
If operation becomes unstable such as the magnetron current is unstable, bring the
radar unit back to STBY mode and restart emission after allowing for an interval of 5
to 10 minutes.
3) Emit radio waves in long pulse range mode for about 15 minutes and reopen the
service engineer menu to perform tuning adjustment.
Adjust the setting in the service engineer menu until the tuning indication bar on the
display unit reaches the 8th calibration marking.
Check in the service engineer menu that the magnetron current is between the 6th and
9th calibration markings.
4) Finally, initialize the transmission time in the service engineer menu.
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8.COUNTERMEASURE FOR TROUBLE ...
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8.4 REPLACEMENT OF MAJOR PARTS
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