Section VI. UNIT MAINTENANCE PROCEDURES
2-12. GENERAL. The procedures in this section have been arranged in the order in which the
items appear in the Unit (O) Maintenance level column on the Maintenance Allocation Chart (MAC)
which is provided in Appendix B. Step by step procedures have been provided for all actions
authorized to be performed by Unit Maintenance in the order in which they appear on the MAC.
Actions authorized to be performed by Direct Support and General Support Maintenance have been
noted; step by step procedures for these actions maybe found in Chapter 5 and 6 respectively.
Disconnect input power to the laundry unit before performing any
internal maintenance. Voltages used can KILL. Shutting the unit
off at the control panel does not disconnect unit power.
General. Preferred repair methods consist of replacing wires, terminals, connectors, etc.,
rather than splicing wires, bending ends to form terminals, and other makeshift
procedures. Although the latter may be appropriate for emergency field repairs.
Determine the proper size and length of wire, or the terminal, or connector to be used for
replacement by referring to appendix E. Cable Diagrams, Wire Run List, and Control
Soldering Connections. Wire connections must be made mechanically sound before they
are soldered. Solder alone does not provide sufficient strength to prevent breakage.
Joining surfaces of connections to be soldered must be clean and bright. If a separate flux is
used, it should conform to Specification MIL-F-14256 rosin base flux, item xx, Appendix C
and should be brushed onto the joint before soldering. If a flux-core solder is used it should
be a rosin core electrical solder. If uncored solder is used it should be a lead-tin solder, item
x, Appendix C, conforming to specification QQ-S-571. Wires should always be heated to the
point at which the solder will melt completely and flow into all parts of the joint. Excessive
build up of solder gobs on the joint should be avoided or removed.
Insulating Joints. The preferred method of insulating electrical joints is by the use of heat-
shrink tubing. To apply, cut a piece of heat-shrink tubing of suitable diameter to a one inch
length for covering joints at terminals or connectors, or to a length about 1/2 inch (1.3 cm)
longer than the joint to be insulated, and slide the tubing over the wire before making the
joint. After the joint is made, slide the tubing so that it covers the joint, and shrink in place
with moderate heat.