Service manual or schematic for Audison LRx 4.1k

[The Lord Flashheart]

Hi all,

Just wondering if anyone had a schematic or service manual for the above amplifier?

It blows the fuse when powered up and I found several dead short transistors inside.

 

[Perry Babin]

I don't have any literature but the transistors are likely FJA4210s.

 

[The Lord Flashheart]

Thanks Perry, I found the data sheets and it appears they are still available.

I am a little lost on an amp of this complexity and am worried that other components may be blown.

I shall replace the transistors en bloc and power up through a current limiting power supply to see what happens.

 

[Perry Babin]

Only one (of two) outputs failed in the channel. If that's the case, you should be able to carefully power it up to see if it will play through the remaining outputs in that channel.

There are people here will access to Audison tech documents. Hopefully one of them will help if you need specific information. Remember that you have 3 other identical channels that you can get part numbers, values or readings from.

 

[ppalli]

Hello,
two of the four channels have 6 power transistors and two have 4.
Here schematics:

 

[The Lord Flashheart]

Thank you very much gentlemen, very helpful.