3-L-079: Repair Procedures
3-79L1:
When soldering or working with CMOS electronics products or equipment, a wrist strap:
Must have less than 100,000 ohms of resistance to prevent static electricity.
Cannot be used when repairing TTL devices.
Must be grounded to a water pipe.
Does not work well in conjunction with anti-static floor mats.
3-79L2:
Which of the following is the preferred method of cleaning solder from plated-through circuit-board holes?
Use a vacuum device.
Use a dental pick.
Use a soldering iron tip that has a temperature above 900 degrees F.
Use an air jet device.
3-79L3:
What is the proper way to cut plastic wire ties?
With flush-cut diagonal pliers and cut flush.
With scissors.
With a knife.
With semi-flush diagonal pliers.
3-79L4:
The ideal method of removing insulation from wire is:
The thermal stripper.
The pocket knife.
A mechanical wire stripper.
The scissor action stripping tool.
3-79L5:
A “hot gas bonder” is used:
For non-contact melting of solder.
To apply solder to the iron tip while it is heating the component.
To allow soldering both sides of the PC board simultaneously.
To cure LCA adhesives.
3-79L6:
When repairing circuit board assemblies it is most important to:
Wear safety glasses.
Use a dental pick to clear plated-through holes.
Bridge broken copper traces with solder.
Use a holding fixture.
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● = Incorrect answer
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