Television and Audio Systems

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Television and Audio Systems
Introduction to Television Audio Systems
Lesson 1. Describe and Identify the Audio Console and Maintenance Procedures Required to Troubleshoot and Repair the Equipment
Figure 1-1. Block diagram of a basic audio console
Functions
Learning Event 2: Describe and Identify the Performance Adjustments Required to Perform Operator's Maintenance of an Audio Console
Performance adjustments
Performance adjustments (Cont)
Learning Event 3: Describe and Identify the Equipment Used in a Complex Audio Console
Complex audio console
Practice Exercise - ss060360017
Lesson 2. Describe and Identify the Four Basic Types of Microphones and the Maintenance Procedures Required for Proper Operations
Figure 2-1. Dynamic microphone (A) mechanical details and (B) circuit diagram
Dynamic microphone
Figure 2-2. Velocity microphone (A) circuit diagram and (B) construction details
Carbon microphone
Figure 2-3. Carbon microphone (A) cross sectional view, (B) single-button circuit diagram, and (C) double-button circuit diagram
Figure 2-4. Crystal microphone (A) cross sectional view of diaphragm and crystal and (B) cross sectional view of single sound cell unit
Figure 2-5. Comparison of microphones
Microphone maintenance
Practice Exercise - ss060360027
Lesson 3. Describe and Identify the Three Main Functions and the Three Main Sections of Audio Tape Recorders
Audio Tape Machine
Figure 3-1a. Tape transport mechanism (record mode)
Figure 3-1b. Tape transport mechanism (erase mode)
Figure 3-1c. Tape transport mechanism (reproduce mode)
Figure 3-2. Construction of magnetic head
Figure 3-3. Laminated core tape head
Figure 3-4. Action of high-frequency erase head
Figure 3-5. Flux lines in a recording gap
Figure 3-6. Recording with high-frequency bias
Learning Event 2: Describe and Identify Maintenance Procedures for Proper Operation of an Audio Tape Recorder
Figure 3-7. Typical record and bias oscillator circuits
Trouble diagnosis
Playback problems.
Practice Exercise - ss060360042
Lesson 4. Describe and Identify the Principles of Radio and Line Transmission, AM/FM Characteristics, Stereo Phase Problems
Figure 4-1. The amplitude modulating process.
Figure 4-2. The heterodyning process produces four signals through the action of the mixer stage
Figure 4-3. The AM radio block diagram
AM carrier transmission.
Learning Event 3: Describe and Identify the Characteristics of FM Radio
AM and FM receiver similarities and differences.
Learning Event 4: Describe and Identify Phase Shifting and Distortion Problems in Stereo Systems.
Learning Event 5: Describe and Identify the Electronic Requirements of Radio Receivers
Practice Exercise - ss060360052
Practice Exercise (Cont) - ss060360053
Lesson 5. Describe and identify Components of Recording Systems, Audio Speakers, Cables and Cords, and Uses of Basic measuring Equipment
Figure 5-1. Cable, equalizer, and system frequency responses
Figure 5-3. Attenuator
Attenuation versus frequency characteristic
Figure 5-5. Speaker pumping action creates air vibrations we hear as sound
Figure 5-6. Changing field of voice coil causes oscillating movement relative to constant field of magnetic structure creating sound
Figure 5-7. Two kinds of cable. At A, a coaxial cable with two concentric conductors
Figure 5-8. At A a two-conductor cord. At B a common three-wire utility cord
Basic measuring equipment
Practice Exercise - ss060360063
Answers to Practice Exercises - ss060360064

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