Model 8310
IM-289A
Aeroflex / Weinschel
28
7. MAINTENANCE:
The following paragraphs provide general inspection and maintenance guide lines for the 8310 Series
Programmable
Attenuator Units.
7-1. INSPECTION:
Perform a visual inspection in conjunction with the maintenance activities schedule when a
malfunction is suspected, or whenever an assembly is removed or replaced.
7-2. PREVENTIVE MAINTENANCE:
While the 8310 requires very little preventive maintenance, it should not be
subjected to physical abuse, severe mechanical shock, high humidity, or operating temperatures outside the
specification range. The instrument should be kept free of excessive dirt and dust, since these can interfere with
connector functions and with normal heat dissipation. For cleaning instructions refer to paragraph 7-3 (special
cleaning instructions). The following paragraphs provide the preventive maintenance that is to be performed on the
Unit.
Care should be taken to prevent strain on the interconnecting cables, since damage here may not always be
apparent. Occasionally check the external cables and connectors for signs of cracked insulation and/or bent or worn
pins. Tests show that connectors must be clean for accuracy and stability. This requires an inspection and cleaning of
each connector immediately before use. For connector cleaning instructions, refer to paragraph 4-3. When cleaning
precautions are observed regularly, connectors can maintain their stability for over several thousand connection
cycles. Refer to Appendix A for more information about cables and connectors.
7-3. SPECIAL CLEANING INSTRUCTIONS:
The cleaning procedures for 8310 are divided into five general groups:
microwave coaxial cable assemblies, circuit card and modules; machined surfaces and hardware, chassis cleaning,
and connector cleaning.
7-3.1. MICROWAVE COAXIAL CABLE ASSEMBLIES:
Appendix A (located at the end of this manual) provides all
the necessary procedures for care, cleaning, and handling of microwave coaxial cable assemblies.
7-3.2 CIRCUIT CARDS AND MODULES:
A protective coating is applied to circuit cards for protection from moisture,
arcing, short-circuiting, and abrasion. To remove light dirt from circuit cards and modules proceed as follows:
CAUTION
•
DO NOT use a nylon bristle brush in the solvent as the bristles may dissolve and cause
damage to the circuit card or component.
•
DO NOT use ultrasonic cleaning on parts or assemblies containing electrical or electronic
components.
•
DO NOT bend pins of electrical connectors when using fiber-bristle brush.
a. Briskly brush isopropyl alcohol onto area to be cleaned with fiber-bristle brush.
b. Carefully remove residue with a clean lint-free cloth and repeat step "a" as a rinse.
WARNING
Compressed air used for cleaning and/or drying can create airborne particles that may
enter the eye. Goggles/ faceshields should be worn. DO NOT direct air stream towards
self or other personnel. Pressure should be restricted to a maximum 15 psi to avoid
personal injury.
c. When parts are thoroughly clean, dry parts using 5 psi of clean moisture free compressed air or
preferably dry nitrogen (pressurized spray will work well).
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