Installation, Operation, and Maintenance Manual # 509252 Rev R 89
5. Reconnect the filament transformer wires to the magnetron and tighten the
terminal screws to 0.9 N-m (8 inch-lbs) using a torque-limiting screwdriver.
Reposition the tubing over the terminal screws and install cable ties.
6. Install the irradiator housing as described in “I300M Irradiator Housing
Removal/Replacement” on page 86.
Magnetron Removal/Replacement
1. Remove the irradiator housing as described previously.
2. Disconnect filament transformer wires from magnetron by removing the cable
ties and sliding back the tubing. Remove the terminal screws.
3. Remove the filament transformer bracket and air plenum.
4. Remove the four screws fastening the magnetron to the casting. Lift the
magnetron off the waveguide assembly and place it upside down in a clear area
on a wooden bench, at least five inches from any magnetic materials (such as
iron or steel).
5. Install the replacement magnetron and fasten it to the casting using the
associated hardware.
6. Refer to Figure 29; hand tighten the magnetron fasteners in sequence as shown
until snug. Then, tighten the fasteners ¼ turn in sequence. Finally, tighten the
fasteners in sequence to 3.4 N-m (30 inch-lbs) using a torque-controlled driver.
Figure 29. Magnetron Fastener Tightening Sequence (I300M)
7. Install the filament transformer bracket and air plenum.
8. Reconnect the filament transformer wires to the magnetron and tighten the
terminal screws to 0.9 N-m (8 inch-lbs) using a torque-limiting screwdriver.
Reposition the tubing over the terminal screws and install cable ties.
9. Install the irradiator housing as described in “I300M Irradiator Housing
Removal/Replacement” on page 86.
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