I am desperately in need of a schematic for a ZX450

gfunk_nz · Post by **gfunk_nz** » Sun Sep 27, 2009 5:25 pm

As per title, the 450 that I will be running my Havocs off has one channel distorting to buggery, I took it in for repair and they are battling to track down the problem. They have asked if I can find a schematic so they can troubleshoot it a lot faster.

Can anyone help me out?

Post by **Eric D** » Sun Sep 27, 2009 5:29 pm

Does the amp draw excessive current, or is it just distorting badly on the one channel?

gfunk_nz · Post by **gfunk_nz** » Sun Sep 27, 2009 6:02 pm

just purely distorting on one channel and it's only under load, without load it's normal

Post by **Eric D** » Mon Sep 28, 2009 6:27 am

What are you using for a load? Is it at high volume or low volume?

gfunk_nz · Post by **gfunk_nz** » Mon Sep 28, 2009 10:54 am

I was just using a speaker I'm not sure what the repairer is using. It was doing it at all levels.

Post by **Eric D** » Mon Sep 28, 2009 1:18 pm

There are some low value resistors which drive the main output transistors. I think they are 2.2ohm. They are designed to blow like a fuse if the output transistor is shorted. One of these may have blown which will result in a very distorted output.