EasyManua.ls Logo

NAD 7140 Service Manual

NAD 7140
20 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
Page #1 background imageLoading...
Page #1 background image

Other manuals for NAD 7140

Question and Answer IconNeed help?

Do you have a question about the NAD 7140 and is the answer not in the manual?

NAD 7140 Specifications

General IconGeneral
Damping Factor50
Input Sensitivity (MM)2.5 mV
Input Sensitivity (Line)150 mV
Signal to Noise Ratio (MM)80 dB
Power Output40 watts per channel (8 ohms)
Frequency Response20 Hz - 20 kHz
Speaker Load Impedance4-16Ω

Summary

Unit Specifications

Power Amplifier Specifications (Stereo)

Details continuous average power output and distortion for stereo mode.

Bridged Mode Power Output

Lists continuous average power output for bridged monophonic mode.

Sectional Component Overviews

Preamplifier Input/Output Details

Covers phono and line level input sensitivities and output characteristics.

FM Tuner Performance Metrics

Details sensitivity, selectivity, and stereo separation for FM reception.

AM Tuner Performance Metrics

Lists usable sensitivity and selectivity for AM reception.

Internal Views and Setup Procedures

Internal Component Layout Diagram

Provides an internal view of the unit's components.

Test Equipment Connection Guide

Shows how to connect test equipment for alignments.

FM Alignment Procedures

FM Oscillator Tuning Voltage Adjustment

Checks and adjusts tuning voltage for the oscillator.

FM RF Tracking Alignment

Aligns RF stages for optimal signal tracking across frequencies.

FM IF Alignment

Adjusts the IF section for maximum and symmetrical curve.

FM Detector Alignment (Coarse & Final)

Covers coarse and final adjustments for the FM detector circuit.

FM Auto Search Level Adjustment

Sets the threshold for the auto-search tuning function.

Stereo Decoder and MPX Filter Tuning

Adjusts VCO and checks suppression for stereo decoding.

FM Dynamic Separation Adjustment

Adjusts R249 and R250 for optimal stereo separation.

FM Synthesizer Frequency Calibration

Calibrates the synthesizer frequency using a known source.

AM Alignment Procedures

AM Oscillator Voltage Calibration

Adjusts oscillator voltage at specific frequencies.

AM Antenna and IF Alignment

Aligns antenna and IF stages for maximum signal readings.

AM Signal Meter and Auto Stop Adjustment

Adjusts signal strength indication and auto-stop level.

Amplifier Alignment Procedures

Amplifier Idle Current Calibration

Sets quiescent current for the amplifier's output stage.

Amplifier Offset Voltage Calibration

Centers speaker terminal DC voltage to minimize distortion.

Printed Circuit Board Layouts

Amplifier PCB Layout Diagram

Diagram showing component placement on the amplifier PCB.

Tuner PCB Layout Diagram

Diagram showing component placement on the tuner PCB.

Schematic and Wiring Diagrams

Amplifier Section Schematic Diagram

Circuit diagram for the amplifier section of the receiver.

Unit Wiring Diagram

Illustrates electrical connections between different parts of the unit.

Tuner Section Schematic Diagram

Circuit diagram for the tuner section of the receiver.

Parts Lists and Exploded Views

Exploded View Parts Identification

Lists parts with reference numbers from an exploded view.

Electrical Component List

Comprehensive list of electrical components used in the unit.

Related product manuals