Buzz, fuzz Fix, - my.marshall.com

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Buzz, fuzz Fix,

Ok, the buzz, fuzz I and others noticed (Its Real). First before you ask I tried the cable and the guitar on my Crate Amp. The notes ring like a bell No fuzz or Buzz.

So that eleminats my guitar and cable. I notice if I use eather the Acustic or Natural Pre Amps on my Code -50 the BUZZ / Fuzz dissipears. So I assume its not a hardware issue with the Code 50. I think its a software issue. Is it possiable to fix and down load new Pre Amp Modelse to fix the problem?

I would love to get this fixed! Its annoying!

asked 12 Feb 2018 at 09:52 PM

My Code 25 buzzed like heck out of the box. I thought it was a bad outlet, bad cable, etc. Turns out I needed to tighten the nut around the input (by hand), it was loose and the noise stopped when tightened up. - 13 Feb 2018 at 03:24 PM

Answers: 8

You are not crazy. I have a Code 25 that was bought back in December 2017, and it didn't show any problem and sound was very good, as you didn't have to lower gain or other parameters to avoid unwated noise. Perfect modeling amp. All of a sudden yesterday night when my daughter was practicing, she yelled at me because a strange buzz and static-like sound appeared literally out of nowhere. I thought It was the guitar's volume pot because I couldn't lower the volume directly from the guitar, so I naturally cleaned the guitar's electronics.

Guess what? I plugged the guitar back to the Code 25, and still showed problems. Changed cables, same problem, only worse. So I plugged the guitar to my PreSonus AudioBox interface... the sound is extremely clean. Ran the guitar into some amp models in Garageband, MainStage and StudioOne, no problems AT ALL with the guitar. Very good sound coming out of the whole recording rig, no noises, static or buzzes whatsoever.

I go back to the amp. Lower all paremeters way down, and discovered the same as you did: problems come up if Amp and Power models are active. Out of trial and error came up to the same conclusions you posted: only the Natural amp is good to use, no Power model active. The rest of the parameters like pre FX, modulations, delays, reverbs, and cabinet models do not add the static buzzing sound. Turn them all off and the combo sounds great, no sound issues. As a last resort, I changed power outlets from a circuit on our home's upper floor, to a different circuit at the floor level that has no devices like fridges or TVs plugged in. No good.

Updated and then reinstalled firmware, as well as resetting factory presets were no use. I just signed up to this forum so I could post back that I have the same problem as you, and I can tell you: IT'S NOT THE FREAKING GAIN OR ANY OTHER PARAMETER LEVELS. Something happened all of a sudden that messed with those model sims. I just plugged in my Gio bass guitar just to be sure: same buzzing, static noise are there.

By the way, we do not use the iOS app for amp tweaking, neither we use the Code 25 as a recording interface nor its Bluetooth features.

What's going on, Marshall?

edited 18 Feb 2018 at 03:22 PM

answered 18 Feb 2018 at 03:21 PM

I just found something interesting yesterday. I heard a buzz noise with certain notes on my 50. While looking around I found the buzz seemed to be coming from the handle. I pulled the handle up so it was arched up from the cabinet and the buzz went away. I think with the closed cabinet design these things vibrate like crazy eventually casing some noises. If I set anything on top of the amp it moves right across the amp until it falls on the floor, I also notice air blowing out of the input jacks when I play through it. - 25 Feb 2018 at 03:25 PM

Thank you for the responses. Sorry Dennis, it didn't have anything to do with the combo's handle.
We left the combo unplugged and unused for three days, and it got back to normal operation after that period. Do you Marshall guys know if this resets the unit's power manager, or something similar?
The failure was a buzzing garbage sound mostly noticeable at the decay stage, as well as some weird popping at the attack when picking the strings. All while using the POWER and AMP emulators. It's not there anymore. If it's not some sort of power management reset, I'm baffled by the issue... - 26 Feb 2018 at 03:26 AM

Now that I think about it, at first I didn't notice the buzz on the decay, until I started using the app to control the amp. Since the amp is on the bottom of a cart (no vibe from the cart) its hard to see the controls so I started using the app. In order to eliminate the Bluetooth connection, I looked at the top panel again. The top panel has Pre -amp Gain, Volume, and Overall Gain Controls. The app does not have the overall Gain Control! Perhaps, before I started using the app I was careful to to always start with the Gain (S) and Volume as low as possible. Also, the instruction manual is unclear as to the distinction between the Volume and the Gain control. I'll play with the amp controls sans app. and let you know what I find out. Oh, I noticed that popping also, now that I think about it, controlling the gain eliminates that also. - 26 Feb 2018 at 03:16 PM

One of possible reasons is you use too much gain. Try to choose Clean American preamp and set gain to 2.0 with no other sections activated, than let us know about results, it will help to diagnose your problem.

answered 13 Feb 2018 at 06:45 AM

Yes the gain must be set very very low and then increase the volume on the amp and guitar to get a loud clean sound. Some of the pre amps / Amp combinations are worse than others. Perhaps the instructions should instruct the user to use a little as possible.

answered 14 Feb 2018 at 02:23 AM

Only first five preamps are supposed to emulate clean sound: JTM45, CL DSL, CL American, CL JVM and Acoustic simulator. All other preamps give crunch or overdrive even at very low gain. For some guitar players who looks for heavy sound, the combination not acceptable for you may be the most desired one...

The biggest advantage of digital amps is enormous variety of sounds, which does NOT mean that everybody has to use all of them. But everybody can find his own favourite sound matching his personal preferences.

edited 14 Feb 2018 at 12:56 PM

answered 14 Feb 2018 at 12:56 PM

Hi Julio,

Thank you for your comment, its hard to look into your issue without hearing the issue itself, we would suggest you return the amp to the dealer to get a qualified engineer to look at the amp, and to then either replace or repair the Code.

Marshall Support

answered 21 Feb 2018 at 11:54 AM

I think the issue is the Input/DSP Board failing, the Marshall representatives in Brazil does not have the Input/DSP Board to sell or even to replace.
Could you guys from Marshall Support send me a place to repair my amp in Brazil?
The only two representatives above doesn't have the parts nor specialist to repair the CODE.

C. BORGES - cborges@cborges.com.br - ?
PRIDE MUSIC - Alameda Juari, 439 - Tamboré - Barueri-SP / Brazil - CEP 06460-090 - contato@pridemusic.com.br - ? - 30 Apr 2023 at 01:52 PM

Hi Fabio,

Please contact servicedesk@marshall.com they will be able to help.

Regards

Marshall Support - 02 May 2023 at 07:36 AM

Hi Joe... I think we have similar issues, but I never had problems with the gain an volume knobs until the problem came up. No matter how low the gain or volume were set to, the noise was there. Like I said, at first I even thought the guitar was the problem because it seemed that you couldn't even lower levels using the guitar volume knob for some brief moments. I forgot to mention that noise was present even when using headphones. Now I can lower or raise gain and volume without those garbage sounds (good levels matched to the instrument's output, of course... if you turn gain or volume way too hot, you do get normal distortion, like other posters sugested.) Again, I think it could be related to some sort of software problem.

answered 26 Feb 2018 at 07:07 PM

I know this thread hasn’t seen a post in about two years, but I’ve got a near new code 50 and I’ve got the same popping/cracking noise on pick attack mostly on the low E string especially when playing hard. I’ve resorted to turning off All effects and it seems like it may still be slightly there but very hard to notice is there any progress towards fixing this? Or should I return the amp and look at finding a better brand? - 24 Feb 2020 at 09:48 AM

Try what I accidentally did. Update the amp's firmware/software. Then leave it unused and unplugged (even from the stock cable at the back of the unit) for three days to see if some sort of power management reset fixes it. Yes, you do this with some computers when they behave erratically.
If you need to know, we no longer have the Code 25 amp. It didn't fail after that, or anything. We just got a couple of Orange combos mid-2018 and we left the Code 25 in the closet, so we sold it last year. - 24 Feb 2020 at 09:01 PM

Thanks mate. I read your post and unplugged it last night. Was also considering selling it but I’ve upgraded the speaker already and have a bit too much money in it. Just want it to behave like a decent amp. 😕 - 24 Feb 2020 at 09:06 PM

Any fix on the buzz ? Reverting to natural restricts the amps value

answered 13 Jun 2021 at 06:40 AM

I have the same issue, after test a lot of components, I believe it's the Input/DSP Board. But the only place I found to buy a DSP Board to replace is an English online store and for EUR 189,00... it's too expensive unfortunately to justify the replace.

The guys from Marshall just ignored my questions about replacement parts or Services in Brazil.

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