Question about Music
I need a Schematic for a CRATE G80XL Guitar Amp
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: amps broken need to fix it
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
Posted on Apr 19, 2009
The next time it stops, unplug the cable from the guitar and touch the tip of the connector with your finger. If the amp hums, then the amp is still working and the problem is in the guitar. If there is no hum from doing this, then the amp has am intermittent.
Try this before it fails to see what to expect in the way of the hum from this test.
Common problems with the amp are OFTEN with a broken input connector or bad switch on the preamp output jack if it has one.
There are MANY other things and without troubleshooting it is hard to steer you to a fix.
Posted on Mar 27, 2010
Hi. use this link to check for the schematics.
Posted on May 31, 2010
Without a schematic you can still trace the circuit to locate the fault.
Put a music source or sound source into the bad channel and a good channel, and with an oscilloscope or with a pair of high impedance headphones with test leads on the ends- you can set up a low z headphone with an impedance match trasformer, make sure you have test prod ends on one of the leads. The other can go to a chassis ground. Start at the input and work your way forward comparing the signal between the good channel and the faulty channel. When you lose the signal or you encounter severe distortion, you are in the vicinity of the defective part.
Common failures are a Deffective 4558 or TL072/TL071/TL074 IC chip. You may have a faulty electrolytic capacitor, or even a faulty bypass caoacitor in general. Bad solder connections, even a broken fim resistor.
With the IC chips, the usual power pins for an 8 pin plastic or ceamic DIP are pins 4 and 8. usual outputs for the 8 pin are 1 and 7 the remaining pins are the inverting and noninverting inputs. 2 and 3 and 5 and 6.
Also check switches and especially those with interupts on the input and output jacks- they can get dirty.
Posted on Apr 11, 2012
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