Consumer Electronics: Audio Repair Module

Study Notes

Consumer Electronic Servicing NC II

Module Title: Maintaining and Repairing Audio Products and System
Introduction: This module covers maintaining and repairing audio products and systems, including required knowledge, skills, and attitudes. Completing this module will help students understand succeeding modules on computer operation.
Learning Outcomes: This module has three learning outcomes:
- LO1: Preparing audio tools and workplace for maintenance/repair of audio products
- LO2: Diagnosing faults of audio products and systems
- LO3: Maintaining/repairing audio products and systems
Summary of Learning Outcomes: Upon completion, students will be able to prepare audio tools and workplace, diagnose faults in audio products and systems, and maintain/repair these products and systems.

Technical Terms

Active State: A condition of a semi-conductor device that's functioning.
Ampere: A unit of electric current.
Capacitance: Measures the amount of electric charge stored.
Conductance: Measures how easily electricity flows.
Current: The flow of electric charge.
Decibel: A logarithmic unit expressing the magnitude of a physical quantity.
Digital: Representing information using discrete values.
Duty Cycle: The proportion of time a component/system is active.
Error: Difference between actual behavior and expected behavior/measurement.
Farad: The SI unit of capacitance.
Frequency: The number of occurrences of a repeating event per unit of time.
Henry: The SI unit of inductance.
Inductance: An electric current flowing in a circuit that produces a magnetic field.
Injury: Damage to a body caused by an outside force/agent (physical or chemical).
Insulation: A material that resists the flow of electric current.
Ohm: The SI unit of electrical resistance/impedance.
Potential Difference: The amount of work needed to move a unit electric charge.
Siemen: The SI derived unit of electric conductance.
Solder: A fusible metal alloy with a low melting point, used to join metal surfaces.
Troubleshooting: A systematic method for finding and solving problems.
Voltage: Electrical potential difference between two points.
Voltage Drop: Reduction in voltage in an electrical circuit.
Wattage: The SI derived unit of power, equivalent to one joule per second.

Learning Outcome 1: Prepare Audio Tools and Workplace

Assessment Criteria:
- Work station is clean, meeting company requirements.
- Necessary tools, test instruments, and personal protective equipment (PPE) are prepared according to their use.
- Service manuals and repair information are acquired for reference.
Equipment Needed: AM-FM radio receiver, AM radio receiver, DVD/VCD player, MP3/MP4 player, professional audio systems (PA), signal generator (AF/RF), analog/digital multimeter (VOM), oscilloscope, power supply, audio frequency counter, distortion analyzer, electronic hand tools (soldering iron, soldering stand), desoldering tool, screwdrivers (Phillips, flat head), pliers (long nose, diagonal), utility knife, cleaning brush, electronic components, soldering lead, wires, silicon grease, soldering flux, requisition slip, PPE (gloves, mask), learning materials, work plan, service manual, IC manual, and learning elements.

Learning Outcome 2: Diagnose Faults

Assessment Criteria:
- Following the manufacturer's instructions for pre-testing.
- Identifying the system's faults.
- Documenting the diagnostics and testing results.
- Explaining diagnosed defects and faults.
Conditions: Specific equipment and tools needed for diagnosis.

Learning Outcome 3: Maintain and Repair

Assessment Criteria:
- Replacing parts/components with correct equivalents.
- Correct soldering of components.
- Adhering to manufacturer's specs during substitutions.
- Completing repairs within set timeframes and adhering to safety regulations.
Conditions: Required tools, equipment, and accessories are listed.