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Scroll down to "Get Manual" at the web page and click on it to download.
Please note that on the first schematic above, the power amp schematic is way down beyond the parts list and layout of the preamp section... keep scrolling. ALSO the powoer amp shows a real WIERD connection where the output transistors drive against ground and the center tap of the power supply transformer for the power amp portion then bounces around with the audio output... that is a wierd connection but it is possible.
Companies are stingy with schematics. If you know the part is bad just replace it. Hint: MOST of the companies use the manufacturer's application note schematics for their designs. Here is one for the TDA2040:
When ordering the part make sure to get either the H or V version to match the one you are replacing... the leads are pre-bent. Use thermal compound grease and if there is an insulator make sure it is OK. Often there is a shoulder washer insulator for the screw.
Here is your schematic for the power amp. There is a separate amp for the tweeter using a LM3886 which is fairly well protected. Open the unit and test the tweeter driver.
Scroll down to "Get Manual" and click on it to download the schematic. At the site is also the preamp section as a separate schematic. You probably don't need that for the failure you are seeing. A lot of the tweeter drivers seem to get blown up, but once you test you will be able to find if the problem is in the amp or the driver.
Most of the problems with the small guitar amps are blown power amp chips. They usually use chips like the TDA2030 which look like a power transistor.
Most other problems involve broken connectors, bad solder joints or cracked circuit boards. The power supply area is so simple one doesn't need a schematic for that part which is usually just three terminal regulators for +/-15 volts. Schematics are often hard to find.
Try this site, although this is a different model, much of the schematic will likely be the same.
Try posting on some of the guitar forums. The schematics you are looking for are only available to licensed repair persons but you might get lucky and find someone who will send them to you. Be sure to state what model amplifier you want. If you are a tech try looking at some schematics for a similar amp and tracing the circuit.
Their may be a schematic on the inside of the amp.I don't remember if Crate puts one or not. And I have had several Crate amps. never needed repair except for tube replacement. If there is not one in side , go here and find what you need . http://www.crateamps.com/support/warranty/ Good luck DFD please rate me TK U
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