NAD 4020 Tuner

[rwaters2]

Hi,
Can anyone help please ?
I need a service manual for a Nad 4020 tuner - I need to re install the string which operates the tuning function - Looks very complicated but with a picture I might get there....
Thanks in advance.
Regards, Richard.

 

[planet10]

I have the service manual scanned, but not made into a distributable format yet... but here is the tuner string diagram (if this isn't big enuff mail me and i can send the full size snapshot)

dave

 

[rwaters2]

Hi Dave,
Thanks for the diagram, however, this is quite different to the layout of my 4020 - My 4020 is the B version (last production version) and I'm wondering if NAD altered things slightly ?
Thanks again,
Richard.

 

[planet10]

I'm wondering if NAD altered things slightly ?

Very possible...

dave

 

[padamiecki]

Hi Dave,
I am new owner of NAD3020 and 4020B tuner.
As you probably have seen I "repaired" 3020 ;-)
Today I powered on 4020B and... no stereo effect, but beautiful analog sound.
I have got the schematics of A version but the resolution is filthy, could you upload the schematic for B version or advice where should I look for fix stereo decoder?
Thank you in advance!
PS. the inside of the tuner was sealed - no dust inside, the parts look like the are straight from the factory, even smells like new.

 

[padamiecki]

the problem solved,
just weak connection in antenna plugin, too weak signal to switch on stereo signal.
I am lucky with this last NAD purchase...
anyway the schematic in good resolution is still wanted...