Service manual NAD 3220PE amplivier

LackyLo · Joined: 14 Dec 2008 Posts: 2 Location: Vienna

Hello
Can anyone help me with a service manual or electric circed diagram for an NAD 3220PE amplivier? Need it for finding out the value from 2 burned resitances.

Thanks and good times for you all

vtech · Joined: 08 May 2006 Posts: 1264 Location: USA

LackyLo · Joined: 14 Dec 2008 Posts: 2 Location: Vienna

Thanks for your try to help me!
Seems the driver circuit for the power trans
driver trans BD 139 collector resistor and trans 2SD669A emiter resitor...
pehaps you have an idea?

greetings LackyLo

vtech · Joined: 08 May 2006 Posts: 1264 Location: USA

There are two BD139's one of which seems to be on a heatsink Q409

here's the final stage.---(Btw, you may want to check all the surrounding components as there may be others).

XXX1 · Guest

Thank You so much!!!
That was exact what I needed.

Greetings from Vienna LackyLo

P.S. So great that there is an internet....

Danrey · Guest

Hi,

I have a NAD 3225pe and have the c511 burned (between the two main big caps ) do you have the circuit for that one? Need to know the size

Thanks,

Dan

vtech · Joined: 08 May 2006 Posts: 1264 Location: USA

Danrey · Guest

That's it

Now I replaced the cap but noticed the 4 fuses were blown, replaced them and still the ones going to the 8 ohms blew again.

where could the problem be? I measured the diodes andd seem ok.
What else should I do and measure?

vtech · Joined: 08 May 2006 Posts: 1264 Location: USA

Sounds like there is still a load on the supply line and if the diodes check Ok and there are no problem with diodes or electrolytics, more than likely you have blown outputs; Q415/416 Q417/418 &/or predrivers Q411thru414-- possibly more?