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Post subject: 4 button pedal (Part#0080996000)
Posted: Tue Jul 30, 2013 11:08 am
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Rock Star
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Has anyone experienced the following?

1. I set the pedal for Mode 1 (QA 1-3 + tuner)

2. I pressed the QA in the 3rd position

3. I pressed the QA in the 1st position to change sounds

Upon changing to a different QA, the light for the new QA was lit ... but so was the light for the previous QA.

This happened to me in mid-performance (twice) so I didn't really have time to properly troubleshoot. I just kept pressing buttons until I ended up on the correct QA and moved on.

Has anyone else seen 2 or more QA's lit on the 4 button pedal at the same time? I'm positive I had the pedal in QA mode.

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Post subject: Re: 4 button pedal (Part#0080996000)
Posted: Wed Jul 31, 2013 9:08 am
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I have TWO of this same pedal and BOTH are doing the same thing on a Mustang III version 1 amp that I use at church.

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Post subject: Re: 4 button pedal (Part#0080996000)
Posted: Wed Jul 31, 2013 9:30 am
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ahhhhh OK. Thanks for confirming it... anyone else?

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Post subject: Re: 4 button pedal (Part#0080996000)
Posted: Wed Jul 31, 2013 1:51 pm
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Hi strings10927,

We will be happy to assist. This sounds interesting, have you tried updating your amplifiers firmware. If not, then please click the link below for instructions on how to update firmware for your Fender® Mustang™ amplifier. Please let us know if we can assist further.

UPDATING FIRMWARE ON FENDER® MUSTANG™ I-V AMPLIFIERS
http://www.fender.com/support/articles/ ... mplifiers/

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Post subject: Re: 4 button pedal (Part#0080996000)
Posted: Thu Aug 01, 2013 8:58 am
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Fender TSL wrote:
have you tried updating your amplifiers firmware.

Hi - yep, I was already updated to 1.10 when this problem occurred....

Image

I should probably note at this point that it's a Mustang III v1, not v2.

jwoertz, were you already updated to 1.10 when you has this issue? Seems like a very limited issue as you were the only response. How many times have you had this happen? It was a first for me ...

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Post subject: Re: 4 button pedal (Part#0080996000)
Posted: Mon Aug 05, 2013 2:48 am
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Hmmm, I'd never had this problem. Then I read this topic, and within a few days my 4-button footswitch starts exhibiting the same symptoms, plus other weird behaviour. This is on a "V1" Mustang IV with firmware 1.10.

I had the "two LEDs lit at the same time in QA mode" problem, occur once. In my case it was QA2 and QA3. Pressing the unlit QA button resolved things.

Then a few minutes later the footswitch sort-of locked up: no matter which of the four buttons I pressed (including the left-hand mode-change button), nothing happened on the footswitch: the left red "QA mode" LED and the right-most button's LED stayed lit. It was not possible even to change footswitch mode.

But on the amp, a completely random preset seemed to have been selected (ie not any of the QA presets). If I changed this with the amp's wheel, pressing any footswitch button would re-select this same arbitrary preset. I then noticed that further pressing the footswitch buttons, while not changing the visual display on the footswitch or amp at all, did seem to change the sound - almost like the footswitch was in stomp mode, even though the display indicated QA mode.

(continued in next reply)


Last edited by scott-uk on Mon Aug 05, 2013 4:01 am, edited 3 times in total.

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Post subject: Re: 4 button pedal (Part#0080996000)
Posted: Mon Aug 05, 2013 2:51 am
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(posting reply in multiple parts as for unknown (to me) reason, the forum won't accept it all as a single reply)

The only way to recover from this was to power-cycle the amp. It hasn't happened again since.

In trying to recall what I might have done immediately prior to these problems occurring, the only thing I can think is that I possibly didn't press the footswitch buttons cleanly - that is, I pressed a button and my toe slid off it, causing the button to spring up suddenly. Maybe this non-clean press and consequent possible contact bounce or insufficient contact time caused the amp and/or footswitch to go into a funny state?


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Post subject: Re: 4 button pedal (Part#0080996000)
Posted: Mon Aug 05, 2013 2:53 am
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(final part of multi-part reply)

Thinking in terms of computer software, the button-press triggers an interrupt routine, which then has to figure out which of several triggers have happened - if the button is no longer pressed at that point or is sending multiple 'bounce' signals, the interrupt routine gets confused. If that is the case, a firmware update would be needed to address this: the physical bounce can't be prevented, but the software needs to be better written to allow for it happening and at least recover gracefully rather than screwing up the amp.


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Post subject: Re: 4 button pedal (Part#0080996000)
Posted: Mon Aug 05, 2013 6:31 am
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Rock Star
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scott-uk wrote:
Hmmm, I'd never had this problem. Then I read this topic, and within a few days my 4-button footswitch starts exhibiting the same symptoms


Oh no! I wonder if it would have happened if you didn't read this. :lol:

The thing is, this amp series and that pedal have been out for a long time now, and I've never seen a complaint about it. I'm leaning towards it being a case of not pressing the button cleanly as you stated Scott, and the amp became 'confused'.

When I had this issue, I was playing in an orchestra pit. When I'm pressing footswitch buttons is often when an actor is speaking and the room is dead silent, so at times I try to press a button quietly by pressing it slowly. It seems to make sense with what you said about 'bounce' signals.

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Post subject: Re: 4 button pedal (Part#0080996000)
Posted: Mon Aug 05, 2013 7:26 am
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Quote:
I wonder if it would have happened if you didn't read this

I concede I was deliberately playing with "QA" mode of the pedal a lot more than normal, having read this topic. So that may have exacerbated it. Sort-of a childish "if I prod the snake often enough with a stick, what will happen?" mentality :-)

Or maybe it's a time-bomb in the firmware code and it's about to start happening to everyone :-) As you observe, no-one else has ever reported it until now...

Quote:
I'm leaning towards it being a case of not pressing the button cleanly as you stated

As an aside: Anyone who remembers 6502-based home computers, eg Commodore PET, should be familiar with this sort of contact-bounce problem: the 'power on' interrupt and the 'soft reset' interrupt call the same routine (indirect jump via FFFC, to be really nerdy...). If the 'soft reset' button bounces, etc, the computer thinks it's a power-on and unhelpfully wipes the entire memory... It's where I learnt the "save everything, frequently" mantra!


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Post subject: Re: 4 button pedal (Part#0080996000)
Posted: Wed May 25, 2016 9:54 am
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I know this thread is old but... a couple of weeks after I read about this problem it also happened to me!!!
I use the 4-button + 2 button footswitch + expression pedal, nearly always in the QA state.

During the last 6 months, it has happened to me like 4-5 times. Usually, the LED of the previously selected QA keeps lit until I go back to this QA and change again to another one, but the QA sound is the correct one all the time, so it's just confusing but it doesn't affect the sound. However, one time it happened to me that I had to power cycle the amp to solve it because I could not change the preset.

I've thought a lot about this issue and the following are my conclusions:

- It may be caused when you accidentally push two QA at the same time. I'm sure that at least one time I accidentally pushed two buttons at the same time when it happened.

- It may be caused by the footswitch cable; often, when this had happened, there are more cables going over/under the ones from the footswitch, so it may be some kind of interference.

I recently bought two shielded cables. I'll try them and see what happens.


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Post subject: Re: 4 button pedal (Part#0080996000)
Posted: Wed May 25, 2016 11:27 am
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Hello!

Shielded cables actually may give you some problems due to the fact that these send these changes due to voltage control and the shielding causes resistance and could give odd readings to the amp. If anything aftermarket, you would want to use standard unshielded speaker cable.

If the issue persists you can give us a call at 1-844-202-0924 and we may be able to discuss some trouble shooting options. Alternatively, you may want to have the amplifier checked out by a local authorized service center in your area that you can locate here - http://www2.fender.com/dealers/service-centers/

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