NAKAMICHI 481 free download

File name 481.pdf

CONTENTS 1. General ... 3 2. Principle of Operation ... 4 2. 1. Mechanisms ... 4 2.1.1. Headblock ... 4 2.1.2. Erase Head ... 5 2.1.3. Double Capstan Tape Drive ... 5 2.1.4. Mechanism Control Cam Operation ... 6 2. 2. Amp. Circuits ... 7 2.2.1. Playback Eq. Amp. Circuit ... 7 2.2.2. Record Eq. Amp. Circuit ... 9 2.2.3. Bias Osc. Circuit ... 9 2. 3. Mechanism Control Circuits ... 10 2.3.1. Outline ... 10 2.3.2. +12 v Power Source ... 11 2.3.3. Power-mute Signal ... 11 2.3.4. Auto Shut.off Circuit ... 11 2.3.5. Record Control Circuit ... 14 2.3.6. Mute Signal ... 14 2.3.7. Control Motor Drive Circuit ... 15 2.3.8. Reel Motor Governor ... 16 3. Removal Procedures ... 17 3. 1. Cassette Case Cover Ass'y ... 17 3. 2. Top Cover Ass'y ... 17 3. 3. Bottom Cover Ass'y ... 17 3. 4. Front Panel Ass'y ... 17 3. 5. Headphone Jack Ass'y ... 17 3. 6. Mechanism Ass'y ... 17 3. 7. Meter Ass'y ... 17 3. 8. Lamp P.C.B. R Ass'y and Lamp P.C.B. L Ass'y ... 17 3. 9. Main P.C.B.Ass'y ... 17 3. 10. Control Switch Holder Ass'y ... 17 3. 11. Switch P.C.B. Ass'y ... 17 3. 12. volume P.C.B. Ass'y and Control Switch P.C.B. Ass'y ... 17 3. 13.