Question about Crate FlexWave FW15 Guitar Amp Combo, 15 Watt Single 8 Speaker

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CRATE GX- 212 HUMS WHEN TURNED ON AND CHIRPS WHEN SHUT OFF. NEED SCHEMATIC AND ADVICE TO ISOLATE THE BAD CAP IN WHICH CIRCUIT THAT IT IS OSCILLATING.

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Witth an oscilloscope analyze the ripple voltage across C67, C70, C14, and C12. Pay close attention to the last two of these which are on +/- 15 volt lines.

The "chirp" when shutting down is LIKELY normal and would probably be from teh DSP effects unit as it goes down. The voltages go out of the operating range and the device essentially goes nuts for a second or so.

Posted on Sep 16, 2010

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Posted on Jan 02, 2017

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I have a crate vtx 212 amp and the power comes on but none of the chanels comes on and no sound what so ever comes out. Nothing looks burnt or corroded idk what the problem is i need help lol


If sure that power is reaching and getting into unit, then confirm that a signal is also reaching unit. If both are positive, then your gear is FUBAR if signal is going into correct input.

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Where is the fuse located on a Crate GX-15?


make sure it's unpluged! then take out the chassis, and look for it on the circuit board. I don't think that one has one.

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I just picked up a Crate VTX 212 amp. It sounds great! However, it hums a little louder than it should. I'm thinking it's a bad ground somewhere? Anyone out there deal with this before?


Check your guitar with another amp, or a different guitar with this one with no effects pedals, etc, to narrow it down to just the amp. At that point, try reversing the polarity. If none of the above helps, you may indeed have a bad ground somewhere and you'll need a tech to follow it to the source.

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Amps have fuses inside. Check them if they are blown. After replacing, if it keeps blowing, then you have a short that needs to be fixed. Good luck!

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Here is the link to Crate customer service-
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The key to troubleshooting is a schematic. Try to procure one.

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1 Answer

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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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Looking for a circuit board manual or diagram for a crate mx120r guitar amp


You can try Loud Technologies @ 866-858-5832, techmail@loudtechinc.com.

They hooked me up with parts and schematic for my Crate G212XL.

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