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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Fri Apr 26, 2019 9:39 am
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Thanks TimsAudio, that makes a lot of sense, and explains the temporary 'fix' I found with the headphone jack.

Quick update: When the same issue presented itself yesterday, I turned down the main volume on my guitar to about half way, and the the amp began to behave as normal. Increasing volume again, issue returned. However, leaving volume low for a couple of minutes, then increasing to full and all was well.

All somewhat irrelevant for me now, as just returned my GT40, as it's only half way into the 60 day 'trial' period- plus it's obviously faulty! Back to my trusty Roland Cube Lite for now, might check out a Roland Cube Street next, as I want desktop size...


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Fri May 10, 2019 9:14 pm
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Brad Traweek - Fender wrote:
reu6857 wrote:
Second GT 40 AMP. Same problem. The sound cuts out for a second intermittently. Help?


Pardon me for asking the bluntly obvious "process of elimination" question here but: have you tried multiple guitars and multiple cables with the same result?

So.... This was July 2017. Coming up on 2 years soon.


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Fri Jun 07, 2019 12:18 pm
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POTENTIAL SOLUTION: I had the same issue and realized I have active pickups in my guitar and the batteries died. After trying a standard strat, it works fine.

TIP: Remember to unplug your guitar when plugged into the amp so your active pickup batteries don't die.


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Sat Jun 15, 2019 9:04 pm
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Unfortunately I experienced the same (intolerable) problem at a gig last Friday night (6/13/19), with my Mustang GT-100 amp. The volume started dropping out in the second set, where it sounded like the volume was being heavily compressed by the amp every time the guitar was strummed. The guitar was plugged directly into the amp. So I had to take the time to set up the backup amp; ok, the audience understood gear somtetimes fails. But, the crowd enthusiasm had to be reestablished again.

The same drop-out problem reoccurred in my studio today, two days later. When the guitar was plugged into another amp, there was no problem. Definitely related to the GT-100.

I love the GT-100 for multiple reasons, however, the way I see it, IF A PIECE OF EQUIPMENT IS NOT RELIABLE, HAS TO GO.

What I need to know from Fender is, can the drop-out problem be PERMANENTLY fixed now, and if not, will Fender apply my purchase price to a different Fender amplifier? (Of course the replacement will be a Fender amp, I wouldn't think of changing to another brand after 50 years of success! Yes, even if Fender doesn't make good on their issue.)

Dave Arpin


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Wed Jun 19, 2019 3:04 pm
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It may just be an early models problem. They are sending me a new one as I could never get the problem of sound cutting out to go away(no matter how many different cords, guitars, deoxit, solutions tried, etc). I had to either cycle power on and off again, bang the side of amp pretty solidly, or strum real hard for the sound to kick back in for awhile. Obviously these were not lasting solutions. So hoping a newer model with hopeful hardware updates or better connections inside will make it all a problem of the past. I used to have a video game store and new xboxes, playstations , etc would sometimes have issues in first year models as well. I think products get rushed out sometimes without enough quality control so you get a fair amount of lemons on first year models of things. No company likes to do massive recalls so they hope they can just deal with the issues as they come trickling in and fix problems on their next release of said items. Theory anyway.


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Fri Jun 21, 2019 5:09 am
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Just77ice wrote:
It may just be an early models problem. They are sending me a new one as I could never get the problem of sound cutting out to go away(no matter how many different cords, guitars, deoxit, solutions tried, etc). I had to either cycle power on and off again, bang the side of amp pretty solidly, or strum real hard for the sound to kick back in for awhile. Obviously these were not lasting solutions. So hoping a newer model with hopeful hardware updates or better connections inside will make it all a problem of the past. I used to have a video game store and new xboxes, playstations , etc would sometimes have issues in first year models as well. I think products get rushed out sometimes without enough quality control so you get a fair amount of lemons on first year models of things. No company likes to do massive recalls so they hope they can just deal with the issues as they come trickling in and fix problems on their next release of said items. Theory anyway.


What the production date or serial number of yours?

Mine is from February 2018 and I have the amp sound cut out two times in a month.

Yesterday I left the amp on for about 15 hours and messed and played a lot with the presets. No issues.
I don't know what it is or what can cause... Thinking of returning but the amp sounds so good


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Sun Jun 30, 2019 6:39 pm
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DavidArpin wrote:
Unfortunately I experienced the same (intolerable) problem at a gig last Friday night (6/13/19), with my Mustang GT-100 amp. The volume started dropping out in the second set, where it sounded like the volume was being heavily compressed by the amp every time the guitar was strummed. The guitar was plugged directly into the amp. So I had to take the time to set up the backup amp; ok, the audience understood gear somtetimes fails. But, the crowd enthusiasm had to be reestablished again.

The same drop-out problem reoccurred in my studio today, two days later. When the guitar was plugged into another amp, there was no problem. Definitely related to the GT-100.

I love the GT-100 for multiple reasons, however, the way I see it, IF A PIECE OF EQUIPMENT IS NOT RELIABLE, HAS TO GO.

What I need to know from Fender is, can the drop-out problem be PERMANENTLY fixed now, and if not, will Fender apply my purchase price to a different Fender amplifier? (Of course the replacement will be a Fender amp, I wouldn't think of changing to another brand after 50 years of success! Yes, even if Fender doesn't make good on their issue.)

Dave Arpin


Any solution on this?
Mine too. The day that came, 20 days later and finally yesterday at a gig.

I think I'll return. This is sad.
Another issue: a very annoying vibration sound of the back chassis at A and E notes


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Mon Jul 01, 2019 1:00 pm
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Today i took my GT apart to do some more connection cleaning and maybe see what else i could do to make things more solid. Because at this point it's 100% that the issues are due to cheap flaky pin connectors of several types. I noticed something i missed before. The send and return and DI connectors are all on thier own little board that has brass pins soldered directly to the board and the pins go inot a female pin connector on the main board when it;s popped into place. Same as with the footswitch board. That one i hardwired the pins together soldering pieces of wire to and from the destinations. Not gonna necessarily do that to the send/return/DI board because it;s a major pain. But i did re-seat it and douse it with deoxit. If that has anything to do with the cutting out issue i should see fewer occurrences of the issue at least for a time. I see this as a very likely reason for the cutting out because the signal goes thru that pin connector and is the contact of any pins that carry the signal is compromised to a degree you would see the same issue we;'re talking about here and the same thing that happens on amps with send and return with a switching jack. I also cleaned the jack contacts in case it's one of those but i seem to recall having this issue one day and plugging a cable from send to return which would fix the issues if it IS a switching jack. And if i recall correctly it didn't. So i am suspicious of that pin connector. At some point if i determine that's what it is that causes this issue i may do a hardwire bypass like i did on the FS board.


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Post subject: BUMP: Mustang GT 40 Sound Cuts Out
Posted: Mon Jul 29, 2019 10:33 am
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I have a similar problem. My GT 40 sound cuts out sometimes during play and sometimes when i turn it on. When playing, I'll be strumming along and then the sound goes away. I hear background noise of the effect (like tremolo or flanger), so doesn't seem like it can be the speaker. I was able to capture the problem on video.

I've tested it with multiple guitars and cables and same problem happens. After a minute or so, the sound comes back. When turning it on, sometimes i hear a slight crackling sound. I'll just get no sound of the guitar through the amp at all. Then a minute later, it comes back.

I bought it through Guitar Center. I'm past their return window and didn't buy their protection program. Took it to a GC store to ask about a Fender authorized repair and they said they don't work on amps in the store. They wouldn't send it to Fender either. They just gave me recommendations for local amp repair people. That would be a huge hassle so I want to avoid that.

https://www.youtube.com/watch?v=HlU3QNsZpJw


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Mon Jul 29, 2019 12:57 pm
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First thing to try is this. Next time it does this plug a cable from the send to the return. If sound comes back you have a dirty/oxidized contact on the switching jack. You can just leave the cable there until you have a chance to spray the jack with Deoxit D5. Or if you don't have any or don't want to pay the $16 price for a can, just always leave a cable plugged it. If it DOESN'T fix it, it's 95% that it;s one of the internal connectors.

EDIT: nevermind, saw the 40 doesn't have a loop. So probably, or almost surely and internal connector. Likely the send/return board which i discussed earlier. If you are capable of pulling that board u don't need to go as far as i did and hardwire it, but pulling it and spraying the pins that plug in when you reinstall the board with D5 will fix it at least for a while if not a long while.


Last edited by oczad on Mon Jul 29, 2019 1:05 pm, edited 1 time in total.

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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Mon Jul 29, 2019 1:02 pm
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Thanks for your response. Do you mean put a cable between the aux and headphone jacks? This is the GT 40 and doesn't have the effects loop like the GT 100/200. Thanks again.


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Mon Jul 29, 2019 1:06 pm
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Read above, you must have posted just before i edited the above post.


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Mon Jul 29, 2019 1:08 pm
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You could try plugging a cable into the phones jack in and out several times to break up and contamination, but i think if i recall someone here said the headphone jack can't be the cause because it's not analog switched or some such thing.


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Fri Aug 02, 2019 11:18 am
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Well, i did the same hardwire fix to the send/return board's pin connectors and it did the cutout thing again today. So apparently theres a different connector responsible. What worked to set things back to normal when i had the footswitch issue was drop the amp onto the floor from a foot or so in hopes it would jolt the offending connector and that always worked. So today when it did the cutting out thing i did that and it took a couple times but it worked, and that tells me it's definitely a connector. But apparently not the send/return board's connector. Fender told me in an email that they did have a issue with a ribbon connector so that's likely it. I used to work on SS fenders and that was a super common issue. They have press on connectors on the ribbon cables and what i would do is pull that off and cut off the 1/4" of the end of the ribbon to use a fresh end and press it back on. It's a fix but generally temporary because those connectors are so unreliable they are almost sure to go bad again. Never the less next time i open it gonna do that. If i recall there are 2 ribbon connectors that i'll have to redo.


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Sat Aug 03, 2019 7:28 am
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Thanks for the response. In terms of risk of shock when working inside the amp, a solid state modeling amp would be different than a tube amp in terms of capacitors, right? if you unplug one of these electronic amps and open it up, what safety measures do you need to take?


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