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Nakamichi 620 Service Manual

Nakamichi 620
34 pages
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Nakamichi
Service Manual
Nakamichi
620
power amplifier

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Nakamichi 620 Specifications

Power IconPower
voltage100/120/220/240 V AC
frequency50/60 Hz
power consumption at idling50 VA
power consumption with both channels driven700 VA
power output100 Watts per channel
IHF power bandwidth5—50, 000 Hz
Performance IconPerformance
total harmonic distortion at 1 KHzLess than 0.002%
total harmonic distortion at 10 KHzLess than 0.005%
intermodulation distortionLess than 0.002%
frequency response5 — 100, 000 Hz +0, -1 dB
signal-to-noise ratioBetter than 120 dB
crosstalkBetter than -70 dB @ 1 KHz
Physical Characteristics IconPhysical Characteristics
dimensions15.75" (W) x 7.44" (H) x 9.76" (D)
dimensions in mm400 mm (W) x 189 mm (H) x 248 mm (D)
weight27.6 Ib
weight in kg12.5 kg

Summary

Nakamichi 620 Service Manual

General Information and Safety

Safety Precautions

Important safety warnings regarding capacitor discharge and handling.

Principle of Operation

Power Supply and Amplifier Stages

Details on power supply, pre-stage, and output stage amplifier configurations.

Peak Power Indicator Function

Circuit operation for peak power indicators based on output levels.

Removal Procedures

Component and Assembly Removal

Steps for removing cabinet, panels, jacks, PCBs, and internal components.

Power Block Readjustment

Readjustment Precautions and Troubleshooting

Guidelines for wiring, grounding, balance, distortion, and oscillation issues.

Mounting Diagrams and Parts Lists

Component Assembly and Parts

Detailed diagrams and parts lists for Power Block, Output, Indicator, and Mechanism assemblies.

Wiring Diagram

Performance Data

Block Diagram

Schematic Diagram

Technical Specifications

Service Bulletin: Protector Circuit Addition

Protector Circuit Purpose and Operation

Explains the addition of a protector circuit to prevent speaker damage from DC voltage.

Modification and Installation Procedures

Details parts, modification steps, wiring, and mounting for the protector circuit.

Protector Circuit Troubleshooting and Specifications

Covers operational timing, potential issues, and countermeasures for the protector circuit.

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