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ASSIGNMENT 2
Textbook assignment: Chapter 3, “Miniature and Microminiature Repair Procedures,” pages 3-1 through
3-51.
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2-1. Which of the following requirements must
be met by a 2M technician to be authorized
to perform repairs at a particular level?
1. Have knowledge of that level
2. Be certified at that level
3. Be experienced at that level
4. Be licensed at the next higher level
2-2. Protective materials applied to electronic
assemblies to prevent damage caused by
corrosion, moisture, and stress are called
1. conformal coatings
2. isolation materials
3. electrical insulation
4. encapsulation coatings
2-3. Before working on a pcb, the conformal
coating should be removed from what part
of the board?
1. The entire board
2. The component side
3. The area of the repair
4. The side opposite the component side
2-4. What are the approved methods of
conformal coating removal?
1. Peeling and abrading
2. Stripping and heating
3. Mechanical and thermal only
4. Mechanical, thermal, and chemical
2-5. Most methods of conformal coating
removal are variations of which of the
following types of removal?
1. Thermal
2. Chemical
3. Mechanical
4. Electrical
2-6. What is the preferred method of removing
epoxy conformal coatings?
1. Solvent
2. Ball mill
3. Hot-air jet
4. Thermal parting tool
2-7. A conformal coating is considered to be
thin if it is less than what thickness?
1. 0.025 inches
2. 0.040 inches
3. 0.050 inches
4. 0.250 inches
2-8. Of the various mechanical methods of
conformal coating removal, physical
contact with the work piece is NOT
required using which of the following
methods?
1. Cutting
2. Grinding
3. Hot-air jet
4. Thermal parting
2-9. Cutting and peeling is an easy method of
removing which of the following types of
coatings?
1. Epox
2. Varnish
3. Parylene
4. Silicone
