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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Thu Sep 05, 2019 7:14 am
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Aspiring Musician
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Yep, it's done it while both are off. Now i leave wifi on because no reason to turn it off. BT always off as i don't use it.


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Tue Sep 24, 2019 5:42 pm
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TimsAudio wrote:
Ozcad, In earlier posts, you were complaining about black tarnish on jacks that make them fail. As much as it looks bad, I have been reassured by experienced field technicians that tarnish from silver plated jacks is not a problem. The tarnish is conductive.


Absolutely correct.


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Fri Nov 01, 2019 12:06 am
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Hi folks, this might be something new to try. I turned off bluetooth and wifi and that didn't fix the issue, but I went into the USB settings in the menu and USB gain was set to +6B. I set it to 0DB and it hasn't happened since. Maybe it's the USB audio that is clipping and causing the sound to drop out.

I can't be sure it's not all three settings that seem to have fixed the issue but it's worth a try.

UPDATE! Sorry after a few days of not cutting out my amp did it again so this isn't the fix :-(


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Wed Nov 27, 2019 10:42 am
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Something you guys might try that hasn't been mentioned before;



So a while back, I was using my GT40 as a speaker to play a podcast from a computer, via a male to male 1/8th inch cable from my laptop to the aux input on the amp.

Afterward, I ended up unplugging the aux cable from my laptop, but left it plugged into the GT40, the cable just hanging out with the one side plugged into the AUX input on the amp, and nothing plugged into the other end.

For weeks, my amp was like this, and I played guitar on it here and there as I usually do, and didn't have any cut outs in the sound.

I didn't really put this correlation together until the other day; I unplugged the AUX cable from the amp since it wasn't being used, and after a short time playing guitar, the sound started cutting out just like before.


I plugged the AUX cable back into the amp, with the other end not plugged into anything, power cycled the amp, and so far it has not cut out again on subsequent play sessions.


As random as this issue has been for everyone, I am not convinced this is actually a fix yet, I pretty much expect it to start wigging out again, but so far it seems to have stopped the cutting out issue. (said that one before....)

Is there some kind of switching circuit that detects something physically plugged into the AUX jack that is possibly being falsely triggered intermittently via vibrations when nothing is plugged into the jack? Happening in a way that it triggers some kind of protection circuit? (brain storming)


I kind of feel like the boy who cried wolf with all this, but try it out fellas, its not like Fender is going to throw us a bone any time soon...


Last edited by jametheth on Fri Nov 29, 2019 6:13 pm, edited 1 time in total.

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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Wed Nov 27, 2019 12:33 pm
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Well, as i said in another thread i hardwired one end (the more suspect end) of a ribbon cable i suspected after noticing the issue sometimes happened when wiggling it. And so far no dropous for about 4 days or so. But IF that wasn't it and it happens again i will plug a cable into the aux while the issue is happening and if thats it it should stop. I never thought to try the aux because you can still play thru the amp while using it, but i did suspect the headphone jack but that didn't seem to make any difference. So i'll give the aux a try if and when it happens again.


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Wed Nov 27, 2019 12:57 pm
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oczad wrote:
But IF that wasn't it and it happens again i will plug a cable into the aux while the issue is happening and if thats it it should stop



I would also power cycle the amp at that point for good measure, it could possibly be triggering a digital fail safe that only clears after re-powering up.


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Wed Nov 27, 2019 1:24 pm
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jametheth wrote:
oczad wrote:
But IF that wasn't it and it happens again i will plug a cable into the aux while the issue is happening and if thats it it should stop



I would also power cycle the amp at that point for good measure, it could possibly be triggering a digital fail safe that only clears after re-powering up.

That usually does the trick, but i don't do that unless i have to like if i am playing at an event or such. When it happens at home i usually want to try things to see if i can get it to stop w/o power cycling. Thats a fix but not one i want to have to do so i'd rather find another way if possible.

And as i said the fix i did on that ribbon cable could be the actual fix since 1)- it was doing it daily and has not since i did that, 2)-fender has said the issue was a ribbon cable not that i take anything they say as gospel, but it does help suggest the likelihood, and 3)-i was able to start/stop the issue one day by wiggling it. (tho other times that had no effect)

So we shall see, but rebooting that amp is a bandaid and not a satisfactory fix in a live situation, so a real fix is needed.


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Thu Nov 28, 2019 4:34 pm
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I’ve never had the cutting out issue with my GT-40, but after jametheth’s post, I realized that I always have a cable plugged into the aux input, because when I’m practicing to YouTube lessons, looping song segments with Capo, etc., I dislike the BT delay and plug my iPad directly into the aux. Not really a confirmation, but maybe a few drops of evidence...


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Fri Nov 29, 2019 6:08 pm
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oczad wrote:
rebooting that amp is a bandaid and not a satisfactory fix in a live situation, so a real fix is needed.



I just meant in the event that once the issue is occurring, if simply plugging in a cable to the AUX jack doesn't immediately make the issue go away, then you should leave it plugged in, power cycle the amp, and continue to monitor to determine if the problem ultimately is resolved.

There is the possibility that once it has started happening, the amp ultimately needs to be power cycled to clear the issue fully.

cthulhu wrote:
I’ve never had the cutting out issue with my GT-40, but after jametheth’s post, I realized that I always have a cable plugged into the aux input, because when I’m practicing to YouTube lessons, looping song segments with Capo, etc., I dislike the BT delay and plug my iPad directly into the aux. Not really a confirmation, but maybe a few drops of evidence...



That is good to hear, certainly some correlating if not supporting evidence.


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Fri Nov 29, 2019 8:31 pm
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Well, so far it's been about a week i think since i did that bypass job to the ribbon cable and it has not done it once. So i hope thats it, tho not so much for others because if it is many will not be able or willing to do that tedious job. But been playing it a lot and leaving it on all say and not a issue to be heard. I'll update at regular intervals, especially if it starts again.


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Fri Dec 13, 2019 8:16 pm
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@oczad So has the ribbon cable solder fixed the dropping out completely? If so I am tempted to try hot glue to prevent movement with vibrations. Which I am guessing was the cause if indeed it has been gone since?


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Sat Dec 14, 2019 12:02 am
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So far, yep. It's been what......3 weeks or so? Hasn't done it once yet and i play it every day for a couple hours and leave it on as i always have. But i won't consider it a win till a lot more time has passed then the longest it's ever gone w/o doing it previously. That would be about a month. So after a couple or 3 months i'd consider it a definite win. Probably is now, but i know how that goes when you assume too early.

But hot glue isn't going to help you. In fact they are already glued from the factory to keep the plug in place. But thats not the issue. I just used glue because with all those tiny solder connections one or more may eventually break with the constant vibration and the ribbon just hanging there with no support. Just hot gluing the cable plug end isn't going to prevent oxidation and loose female sleeves. If that were the fix the factory glue would have prevented the issue. It needs solid solder connections.


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Sat Dec 14, 2019 11:39 am
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10-4, I think I am going to just give Fender a call to discuss options since its still under warranty. I have been cautious to do any real troubleshooting cause I do not want to void warranty. I will say it would be nice to see pin10 on the 100AS1 P101 connector while running. I am really curious if the AmpDisable (Mute) signal is getting triggered or if there is an actual disconnect happening. When I lose sound it is a full dropout which seems like the ICEPower is triggering the mute. The question is if it is indeed getting triggered what is causing it. Or is it simply a loose connection... who knows without proper digging and a full schematic. I did find quite a bit of info on the ICEPower Amplifier / Mains Power board though. There is a decent sized datasheet available on the net with quite a bit of good info on it.

I know others have tried disabling both the BT & WIFI and still had the dropouts but that is currently how mine is running with those disabled. I have not been using a fan to provide any extra cooling and so far have had zero dropouts. I am guessing with enough time the dropouts will start again but want to be sure before giving Fender a call. I wanted to test this again cause when the dropouts start if I search for WIFI signals nothing will show up. Once the amp is rebooted SSID's begin showing up again and no other wireless devices have any issues seeing SSID or staying connected. Not to mention when I did this last time I did not have any dropouts. I just wish I had left them disabled longer as I gave up after a week or so to control the amp again with phone. If I do re-enable I will only do BT this time and leave WIFI off but the plan is to leave both off and not use any wireless connectivity at all. I probably should keep the 4 button FS disconnected as well since it is on the same PCB. Just hard to give up looping when playing lol. I suppose I could use my Ditto in the loop but want to keep any extra stuff disconnected at least until it starts again, which I am guessing it will going off what others have experienced.

Would be nice if I had a close Fender service center but I think the closest is 200 miles away unfortunately. If one was close enough would have already stopped by to have them look at it.


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Sat Dec 14, 2019 1:21 pm
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Like i said, my wifi and BT is off always except when i update. But since day one i always turn them off and the dropouts have always been a issue till now, and they still may as i said so it's a waiting game. The only way i can see that your issue would be wifi/BT is if your issue is not the same as mine, and maybe thats the case because mine does not dropout to zero volume as you described yours doing. It drops to about 1/2 volume upon striking the strings then jumps back up to full within about a second. But also remember what i have said before.....mine has literally gone months without a dropout. In fact, up till a few months ago that was always the case and why i was not worried about it. Then one day it began doing it on a daily basis and that's when it became a concern. And that's why i said i won't consider this a fix till it's been a few months.

As to fender service centers, believe me, they will not help past confirming theres an issue and authorizing a complete amp replacement. But if u expect any kind of troubleshooting t ain't gonna happen. These amps are designated non field repairable meaning warranty does not cover repairs, only replacement. If thats your objective then yes, otherwise a warranty station will do you no good.


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Post subject: Re: Mustang GT 40 Sound Cuts Out
Posted: Sat Dec 14, 2019 2:03 pm
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Yea a replacement is what I would be looking for I figured as much since these are not your typical amp. Not to mention I ended up with this unit due to my III V2 starting to crackle and die out which was CPU's overheating... go figure right... I haven't have much luck but at least have my patience lol :P

The 1/2 volume was never how mine dropped out so I think I might have a different issue as well. Or same issue I suppose just more severe is a possibility as well. I have checked the speaker connections and those are rock solid. Tried multiple guitars and cables and removed any extra pedals/cables/etc ya know the whole rigmarole :P


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