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Old 18th April 2011, 11:01 PM   #1
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Default Crate amp cutting out

Hello to all. I am wondering about my amp. It has recently been cutting out whenever i mess with the input jack, this includes toutching the cord anywhere near the input jack. This is becoming an ever growing problem, and i am thinking it would be as quick as re-soldering the input jack. Is there anything that i should know before i start, And would music shops fix this for cheep? i would rather have another person who is more experienced than me to fix it. Any suggestions??
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Old 19th April 2011, 02:17 AM   #2
jimirb is offline jimirb  United States
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If you have this fixed commercially, you'll be paying for someone's TIME, not necessarilly their technical knowledge. I would guess you'll pay for at least 2 hours bench time just to take the amp apart far enough to get to the jack, do a quick solder job, re-assemble it, and test it.Assuming you are correct in your diagnosis, and assuming you have the proper soldering equipment, it's not a difficult repair. You have very little but a couple of hours to lose in taking a look yourself.
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Old 19th April 2011, 08:33 AM   #3
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Are you sure it's not the lead?
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Old 20th April 2011, 06:47 AM   #4
teemuk is offline teemuk  Finland
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Quote:
Originally Posted by jimirb View Post
If you have this fixed commercially, you'll be paying for someone's TIME, not necessarilly their technical knowledge.
There's "bench fee" because these guys run a business, which includes costs like rent, equipment, booking, etc. ...And after studying several years on electronics theory and creating network with manufacturers to establish warranty repair deals these guys likely don't want to run their business as charity but actually expect to get paid what they deserve. You are paying the guy because he won't ruin the PC board while working on it (like some first-timer may well do) and for being able to troubleshoot and successfully repair the amp up to manufactuer's specs, if the problem happens to be something else than a failed solder in the input jack. As said, you're also paying for his tools and whole enchilada, just like you'd pay an electrician, a plumper, car mechanic, or any other guy being a specialist on his field.
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Old 21st April 2011, 12:37 AM   #5
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My friend does electronics. Is it ok to give him the job??
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Old 21st April 2011, 02:00 AM   #6
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It is probably I bad solder joint on the board at the connector.
I have seen this alot.
However they have been using a new style of p.c. mount connector the last few years and it is a pis poor design and some times they are bad right off the bat.

If you know how to use a soldering iron save yourself the money.
Even though it is a PIA to get those things apart sometimes.

Just remember if you have to remove any devices that are heatsinked to the chassis DO NOT fire it up without these devices remounted as the heat will destroy them instantly.

If your friend is knoledgeable in electronics it would be a good idea for him to help you.

Modern guitar amps are pain becuase it generaly requires you to take off every single knob and unbolt every control from the front panel and also unmounting the output devices before you can get the board out.

If you have too unmount the output devices make sure that there is enough heatsink compound when you remount them.
Sometimes there is already enough and all you have to do is resmear it on the output devices and then remount them.

Good luck. jer
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Old 23rd April 2011, 10:08 AM   #7
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Has anyone checked the lead?

Sounds almost exactly like a dodgy connection in the plug to me. It'd be a very quick test to see if it is the lead, then move on to open the amp up when we're certain it is the amp.
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Old 24th April 2011, 10:50 PM   #8
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Ok. i got this fixes, and it was simple. The amp sounds really different now that this is fixed. Thanks for the help.
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Old 24th April 2011, 10:54 PM   #9
jimirb is offline jimirb  United States
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So don't leave us hanging....what was the problem and what was the fix?
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Old 19th May 2014, 01:00 AM   #10
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Had same the same problem with Crate TX15 Taxi amplifier and here is my fix. With guitar plugged in, power indicator goes from red to orange, and/or sound cuts in and out. Load capacitor in power supply may have failed. Even though battery shows 12v dc and power plug reads 15 v dc, the capacitor's purpose is to maintain a consistent load voltage for amplifier to function. To verify, measure power supply output during normal operation, two yellow wires. Plug in a instrument, observe DC voltage. If voltage fluctuates when instrument is played, unsolder two leads and replace load capacitor. Largest cap on power supply board, (4700uf 25 volt). Visual inspection of capacitor indicated bulging on top of can and leaking dielectric. Ensure lead polarity during install, negative lead of capacitor is circuit board ground. Appx cost of cap $3 US. Thanks.
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