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104 F300S/F300SQ Ultraviolet Lamp System
Magnetron Removal/Replacement
1. Remove the irradiator housing as described previously.
2. Disconnect the 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 (iron, steel,
etc.).
5. Install the replacement magnetron and fasten to the casting using the associated
hardware.
6. Refer to Figure 42. 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-limiting
screwdriver.
Figure 42. Magnetron Fastener Tightening Sequence
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 previously described.