HEEELP, iI need a Schematic for a crate amp GX65

[maicol]

I have a broken Crate GX 65 amplifier. I want to repair it but i don't have a clue how to start to doing so. As I am an Electronic Engineer, I don´t have problems with technical slang.

Can anyone help me with the circuit?. Any Tips to how to start to repair my amplifier?. I want to repair the main Transistors, but before I do it, I want an expert opinion. I have readed in another thread for some tips, I´m working now on them.

Im grateful with any help, thanx

Maicol
Mexico 🙂

 

[thedoctor]

Crate repair

To get the schematic, FAX SLM @314-727-8929 and mark it attention: service dept. Do not call them; they hate that. The only thing that I have seen put one of these little Crates down is a bad jackswitch and blown output transistors. Neither one is very hard to fix. You were not specific about the problem so that is all I can do, for now.

 

[maicol]

Thanx doctor

I´ll describe my problem. When I turn on my amplifier it only produces a buzzing sound and it doesn´t respond to any input signal. I think the problem is, as you say, blown output trasnsitors. I will replace them today. I´ve found one short-circuited diode (D17), i´ll replace it too. I hope that fix my amplifier.

I have a question, how i know if the thermal fuse built in the main transformer is not blown?

There´s a problem. I can´t fax from Mexico, but i´ll try to get the schematic from internet.

Thank you
Maicol

 

[thedoctor]

Crate repair

If you still experience lack of output, clean the headphone jack switch and the effects loop jack swithes and the external speaker jack switch, if this amp has any of these. They are a VERY common source of problems.