Introduction to Maintenance Fundamentals of 3/4-Inch Video Cassete Recorder
Lesson 1. Fundamentals of Video Recorders
Figure 1-1. Typical magnetic head
Figure 1-2. Simplified sketch of flux lines in a recording gap
Figure 1-4. Playback process
Figure 1-5. Use of high frequency bias recording
Figure 1-6. Wavelength limitations in tape playback
Learning Event 5: Principles of Longitudinal Recording with Rotating Headwheel
Learning Event 5: Principles of Longitudinal Recording with Rotating Headwheel (Cont)
Practice Exercise - Ss060470017
Lesson 2. Fundamentals of Helical Scan Video Recorders
Figure 2-1. Tape wraps
Learning Event 3: Fundamentals of Video Tape Tracks
Practice Exercise - Ss060470021
Lesson 3. Principles of Helican Scan VCR Circuits in Record Mode
Learning Event 2: Fundamentals of the Luminance Signal Record System (MD-4 Board)
Learning Event 4: Functions of Comb Filter Circuit
Learning Event 5: Fundamentals of Y High Frequency Preemphasis and FM Modulation
Learning Event 6: Fundamentals of Y Record Amplifier Circuit (RA-2 Board) and Chroma Signal Record System
Learning Event 7: Chroma Signal Frequency Down-Converter Circuit and Chroma Record Amplifier Circuit
Learning Event 7: Chroma Signal Frequency Down-Converter Circuit and Chroma Record Amplifier Circuit (Cont)
Practice Exercise - Ss060470029
Practice Exercise (Cont) - Ss060470030
Lesson 4. Fundamentals of the VCR Playback Circuits
Learning Event 2: Fundamentals of the Tracking Meter and Dropout Compensator Circuits (PS-10)
Figure 4-1. Cosine equalizer
Figure 4-3. Y-FM demodulator
Learning Event 5: Fundamentals of the Noise Eliminator Circuit and Y/C Mixer (Y/E-2 Board)
Learning Event 6: Fundamentals of the Chroma Demodulator (PS-10)
Learning Event 7: Fundamentals of Playback ACC and ACK Circuits
Learning Event 7: Fundamentals of Playback ACC and ACK Circuits (Cont)
Learning Event 8: Functions of the Automatic Frequency Control Circuit
Learning Event 8: Functions of the Automatic Frequency Control Circuit (Cont)
Practice Exercise - Ss060470041
Practice Exercise (Cont) - Ss060470042
Lesson 5. Fundamentals of the Audio and Servo Systems of a Helical Scan VCR
Learning Event 2: Fundamentals of the Capstan Servo and Capstan Speed Servo Circuits
Learning Event 3: Functions of the Capstan Servo/Record and Capstan Phase Servo/Playback Circuits
Learning Event 4: Fundamentals of the Audio (AV-8) and Power Supply Circuits (PW-1A)
Practice Exercise - Ss060470047
Foldout Diagrams for Lessons 3, 4, and 5
Figure (fo) 3-1. Overall block diagram.
Figure (fo) 3-1. Overall block diagram - continued.
Figure (fo) 3-2. (MD-4) Y/C modulator
Figure (fo) 3-2. (MD-4) Y/C modulator - continued - Ss060470052
Figure (fo) 3-2. (MD-4) Y/C modulator - continued - Ss060470053
Figure (fo) 3-3. (RS-2) Right switch block
Figure (fo) 3-3. (RS-2) Right switch block - continued
Figure (fo) 3-4. (RA-2) Y/C record amplifier, (PS-10) playback RF amplifier, (HF-3) PB Y RF sideband equalizer
Figure (fo) 3-4. (RA-2) Y/C record amplifier, (PS-10) playback RF amplifier, (HF-3) PB Y RF sideband equalizer - continued - Ss060470057
Figure (fo) 3-4. (RA-2) Y/C record amplifier, (PS-10) playback RF amplifier, (HF-3) PB Y RF sideband equalizer - continued - Ss060470058
Figure (fo) 4-2. (DM-7) Y/C demodulator
Figure (fo) 4-2. (DM-7) Y/C demodulator - continued - Ss060470060
Figure (fo) 4-2. (DM-7) Y/C demodulator - continued - Ss060470061
Figure (fo) 4-4. (YE-2) Y noise eliminator, Y/C mixer, and video output amplifier
Figure (fo) 4-4. (YE-2) Y noise eliminator, Y/C mixer, and video output amplifier - continued
Figure (fo) 4-5. (PS-10, MA-7, and GH-1) drum servo, and chroma demodulator
Figure (fo) 4-5. (PS-10, MA-7, and GH-1) drum servo, and chroma demodulator - continued - Ss060470065
Figure (fo) 4-5. (PS-10, MA-7, and GH-1) drum servo, and chroma demodulator - continued - Ss060470066
Figure (fo) 5-1. (CS-8) capstan servo
Figure (fo) 5-1. (CS-8) capstan servo - continued - Ss060470068
Figure (fo) 5-1. (CS-8) capstan servo - continued - Ss060470069
Figure (fo) 5-2. (AU-8) audio rec/PB amplifier
Figure (fo) 5-2. (AU-8) audio rec/PB amplifier - continued - Ss060470071
Figure (fo) 5-2. (AU-8) audio rec/PB amplifier - continued - Ss060470072
Figure (fo) 5-3. (PW-1A, PW-1B, and AC-2) Power supply
Figure (fo) 5-3. (PW-1A, PW-1B, and AC-2) Power supply - continued
Answers to Practice Exercises - Ss060470075
Answers to Practice Exercises (Cont) - Ss060470076
Maintenance Fundamentals of 3/4-Inch Video Cassette Recorders
Lesson 1. Fundamentals of Video Recorders
Figure 1-1. Typical magnetic head
Figure 1-2. Simplified sketch of flux lines in a recording gap
Figure 1-4. Playback process
Figure 1-5. Use of high frequency bias recording
Figure 1-6. Wavelength limitations in tape playback
Learning Event 5: Principles of Longitudinal Recording with Rotating Headwheel
Learning Event 5: Principles of Longitudinal Recording with Rotating Headwheel (Cont)
Practice Exercise - Ss060470017
Lesson 2. Fundamentals of Helical Scan Video Recorders
Figure 2-1. Tape wraps
Learning Event 3: Fundamentals of Video Tape Tracks
Practice Exercise - Ss060470021
Lesson 3. Principles of Helican Scan VCR Circuits in Record Mode
Learning Event 2: Fundamentals of the Luminance Signal Record System (MD-4 Board)
Learning Event 4: Functions of Comb Filter Circuit
Learning Event 5: Fundamentals of Y High Frequency Preemphasis and FM Modulation
Learning Event 6: Fundamentals of Y Record Amplifier Circuit (RA-2 Board) and Chroma Signal Record System
Learning Event 7: Chroma Signal Frequency Down-Converter Circuit and Chroma Record Amplifier Circuit
Learning Event 7: Chroma Signal Frequency Down-Converter Circuit and Chroma Record Amplifier Circuit (Cont)
Practice Exercise - Ss060470029
Practice Exercise (Cont) - Ss060470030
Lesson 4. Fundamentals of the VCR Playback Circuits
Learning Event 2: Fundamentals of the Tracking Meter and Dropout Compensator Circuits (PS-10)
Figure 4-1. Cosine equalizer
Figure 4-3. Y-FM demodulator
Learning Event 5: Fundamentals of the Noise Eliminator Circuit and Y/C Mixer (Y/E-2 Board)
Learning Event 6: Fundamentals of the Chroma Demodulator (PS-10)
Learning Event 7: Fundamentals of Playback ACC and ACK Circuits
Learning Event 7: Fundamentals of Playback ACC and ACK Circuits (Cont)
Learning Event 8: Functions of the Automatic Frequency Control Circuit
Learning Event 8: Functions of the Automatic Frequency Control Circuit (Cont)
Practice Exercise - Ss060470041
Practice Exercise (Cont) - Ss060470042
Lesson 5. Fundamentals of the Audio and Servo Systems of a Helical Scan VCR
Learning Event 2: Fundamentals of the Capstan Servo and Capstan Speed Servo Circuits
Learning Event 3: Functions of the Capstan Servo/Record and Capstan Phase Servo/Playback Circuits
Learning Event 4: Fundamentals of the Audio (AV-8) and Power Supply Circuits (PW-1A)
Practice Exercise - Ss060470047
Foldout Diagrams for Lessons 3, 4, and 5
Figure (fo) 3-1. Overall block diagram.
Figure (fo) 3-1. Overall block diagram - continued.
Figure (fo) 3-2. (MD-4) Y/C modulator
Figure (fo) 3-2. (MD-4) Y/C modulator - continued - Ss060470052
Figure (fo) 3-2. (MD-4) Y/C modulator - continued - Ss060470053
Figure (fo) 3-3. (RS-2) Right switch block
Figure (fo) 3-3. (RS-2) Right switch block - continued
Figure (fo) 3-4. (RA-2) Y/C record amplifier, (PS-10) playback RF amplifier, (HF-3) PB Y RF sideband equalizer
Figure (fo) 3-4. (RA-2) Y/C record amplifier, (PS-10) playback RF amplifier, (HF-3) PB Y RF sideband equalizer - continued - Ss060470057
Figure (fo) 3-4. (RA-2) Y/C record amplifier, (PS-10) playback RF amplifier, (HF-3) PB Y RF sideband equalizer - continued - Ss060470058
Figure (fo) 4-2. (DM-7) Y/C demodulator
Figure (fo) 4-2. (DM-7) Y/C demodulator - continued - Ss060470060
Figure (fo) 4-2. (DM-7) Y/C demodulator - continued - Ss060470061
Figure (fo) 4-4. (YE-2) Y noise eliminator, Y/C mixer, and video output amplifier
Figure (fo) 4-4. (YE-2) Y noise eliminator, Y/C mixer, and video output amplifier - continued
Figure (fo) 4-5. (PS-10, MA-7, and GH-1) drum servo, and chroma demodulator
Figure (fo) 4-5. (PS-10, MA-7, and GH-1) drum servo, and chroma demodulator - continued - Ss060470065
Figure (fo) 4-5. (PS-10, MA-7, and GH-1) drum servo, and chroma demodulator - continued - Ss060470066
Figure (fo) 5-1. (CS-8) capstan servo
Figure (fo) 5-1. (CS-8) capstan servo - continued - Ss060470068
Figure (fo) 5-1. (CS-8) capstan servo - continued - Ss060470069
Figure (fo) 5-2. (AU-8) audio rec/PB amplifier
Figure (fo) 5-2. (AU-8) audio rec/PB amplifier - continued - Ss060470071
Figure (fo) 5-2. (AU-8) audio rec/PB amplifier - continued - Ss060470072
Figure (fo) 5-3. (PW-1A, PW-1B, and AC-2) Power supply
Figure (fo) 5-3. (PW-1A, PW-1B, and AC-2) Power supply - continued
Answers to Practice Exercises - Ss060470075
Answers to Practice Exercises (Cont) - Ss060470076
Maintenance Fundamentals of 3/4-Inch Video Cassette Recorders
