MODERN BURNER UNIT (MBU)
DIRECT SUPPORT MAINTENANCE PROCEDURES
THIS SECTION COVERS:
Inspect, Replace, Repair
Power converter disconnected from power source
Tools and Special Tools
Shop Equipment Automotive Maintenance and Repair: Organizational Maintenance,
Common No. 1 (WP 0038, Table 2, Item 2)
Multimeter (WP 0038, Table 2, Item 3)
This procedure contains information and instructions on maintaining the power converter in good working
order by inspecting and replacing the power input cable, main power switch, or the entire power converter
Inspect the outer case of the power converter for any damage that would expose or damage the internal
components. Inspect the power cable is not cut, frayed, or other wise damaged. Ensure the plug on the
power cord has not been damaged. Ensure that the Power Output connectors are not bent, or damaged
in any way that would prevent the proper of cable connectors. Ensure that the LED indicator operates
If it is suspected that the Power Converter is not operating properly, verify that the output voltage of the
Power Converter is 24VDC with a multimeter.
Replacing the Main Power Switch. To replace the Power Converter Main Power Switch (1), remove the
top cover (2) of the power converter by removing the ten screws and washers (3).
Loosen and remove the hex nut with protective rubber cap (4) of the main power switch (1).
Make note of the location, color, and connection point of the two wires connected to the main power
switch inside the power converter to ensure that the wires are reconnected properly when the switch is
Reach inside the power converter case and disconnect the spade connector (5) which connects one
terminal (6) of the power switch to the AC filter block (10).
Loosen and remove the screw (7) that secures the wire (8) to the second terminal. Set this wire aside.