Nakamichi High-Com II - Service Manual

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Summary

1. GENERAL

1.1. Control Functions

Lists and illustrates the control functions of the Nakamichi High-Com II.

1.2. Voltage Selector

Explains the function and location of the voltage selector on the rear panel.

2. PRINCIPLE OF OPERATION

2.1. High-Com II Noise Reduction System

Details the noise reduction system, including compression, expansion, and frequency division.

2.2. Subsonic Filter

Explains the purpose and operation of the subsonic filter.

2.3. Power Mute

Describes the mute circuit and its function to prevent transient noise.

2.3.1. Power ON

Explains the mute circuit operation when the power is turned ON.

2.3.2. Power OFF

Explains the mute circuit operation when the power is turned OFF.

3. REMOVAL PROCEDURES

3.5. Main P.C.B. Assy

Instructions for removing the Main P.C.B. Assembly.

3.6. Power Transformer

Instructions for removing the power transformer.

3.7. Meter Assy, Meter and Lamp P.C.B. Assy

Instructions for removing meter and lamp components.

3.8. Power Switch

Instructions for removing the power switch.

3.9. Rear Panel Assy

Instructions for removing the rear panel assembly.

3.10. 2 P Pin Jack and Volume

Instructions for removing pin jacks and volume controls.

3.1. Top Cover Assy

Instructions for removing the top cover assembly.

3.2. Bottom Cover Assy

Instructions for removing the bottom cover assembly.

3.3. Side Panel Assy

Instructions for removing the side panel assembly.

3.4. Front Panel Assy and Meter Escutcheon

Instructions for removing the front panel and meter escutcheon.

4. ADJUSTMENTS AND MEASUREMENTS

MPX Filter Adjustment

Details the procedure for adjusting the MPX filter.

400 Hz Tone Level Adjustment

Details the procedure for adjusting the 400 Hz tone level.

High-Com II Low Band Adjustment

Details the procedure for adjusting the low band settings.

High-Com II High Band Adjustment

Details the procedure for adjusting the high band settings.

Encoding Characteristics Measurement

Details the measurement procedure for encoding characteristics.

Level Meter Amp. Adjustment

Details the procedure for adjusting the level meter amplifier.

Signal to Noise Ratio Measurement

Details the procedure for measuring signal-to-noise ratio.

Subsonic Filter Measurement

Details the procedure for measuring the subsonic filter performance.

5. MOUNTING DIAGRAMS

5.1. Main P.C.B. Assy

Shows the top-down view of the Main P.C.B. Assembly with component layout.

5.2. Lamp P.C.B. Assy

Shows the layout of the Lamp P.C.B. Assembly.

6. MECHANISM ASSY AND PARTS LIST

6.1. Synthesis

Lists parts and provides diagrams for the synthesis mechanism.

6.2. Synthesis Mechanism Assy (A01)

Exploded view and parts list for Synthesis Mechanism Ass'y (A01).

6.3. Rear Panel Assy (B01)

Exploded view and parts list for Rear Panel Ass'y (B01).

6.4. Meter Assy (B02)

Exploded view and parts list for Meter Ass'y (B02).

7. BLOCK DIAGRAM

8. SCHEMATIC DIAGRAM

9. WIRING DIAGRAM

10. PERFORMANCE DATA

11. SPECIFICATIONS