Product: Service Manual. For NAD 4020 FM Stereo Tuner and 3020 Stereo Amplifier, Combined Manual. This is a complete service manual (18 pages) but also includes a wealth of information in the form of service and technical bulletins for mods, corrections, performance or stability improvements, etc (27 pages). See list below:
Covers/Contents:
Service Manual:
Specifications
Inside view of unit
Block Diagram
4020 Alignment & dial cord stringing
3020 Alignment
4020 Assembly diagram
3020 Assembly diagram
4020 PCB parts location & wiring diagram
3020 PCB parts location & wiring diagram
4020 Circuit diagram
3020 Circuit diagram
Packing diagram
Parts List (4020)
Parts List (3020)
Service and Technical Bulletins
3020 Production Changes
3020 VLF oscillation
3020 Slew Rate
4020 Fusing & Illumination
3020 Phono preamp overload margin @ 20kHZ
3020 High frequency oscillation
3020 20HZ THD in Normal-In
3020 Amplifier heating & idle current adj
3020 Input coupling caps
All models: input/output jacks
4020 Drops out of stereo
3020 Headphone volume
3020 Parasitic oscillation, instability
3020 with external power amp
Addendum (frequency response)
4020/4020A Fuses
3020 Output transistors shorting
3020 Rear panel labeling incorrect
3020 Hum
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