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NAD 3140 Service Manual

NAD 3140
35 pages
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NAD 3140 Specifications

General IconGeneral
Power Output40 watts per channel into 8Ω (stereo)
Frequency Response20Hz to 20kHz
Total Harmonic Distortion0.03%
Damping Factor50
Input Impedance47kΩ (line)
Dimensions420 x 96 x 240mm
Input Sensitivity2.5mV (MM), 150mV (line)

Summary

Product Specifications

Internal Component Layout

System Block Diagram

Electronic Circuit Schematics

Printed Circuit Board Component Layout

Calibration and Alignment Procedures

DC Offset Adjustment

Adjusts DC voltage at speaker terminals to zero for L and R channels.

Idle Current Calibration

Sets bias voltage for output transistors, ensuring correct idle current.

Power Indicator LED Alignment

Adjusts VR201, VR202 to light the 50W LED for power indication.

Internal Wiring Schematics

Unit Assembly Diagram

Component Parts List

Service Bulletin: RFI and Power Line Transient Interference

Service Bulletin: Fuse Blowing and Parasitics

Service Bulletin: Speaker Circuit Breaker Correction

Service Bulletin: Phono 1 Adcom MC Cartridge Stability

Service Bulletin: Voltage Conversion Instructions

Service Bulletin: Idle Current and Overheating Correction

Service Bulletin: Power Amplifier Driver Stage Revision

Service Bulletin: Low Level Switch Pop Noise

Service Bulletin: Bridged Mode Stability Improvement

Service Bulletin: Bridged Headphones Adapter

Service Bulletin: Phono Preamp Stability Enhancement

Service Bulletin: Filter Capacitor Replacement

Service Bulletin: Status LED Failure and Resistor Burnout

Service Bulletin: Soft Clip Circuit Improvement

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