Yamaha 01V96

[Specsto]

Hi all anyone know what causes this. I hear a hum from transformer and will replace it eventually but I really want to get this issue dealt with. I love this mixer and it works well with my workflow except I can’t pass audio through it because of this issue. It happens on startup now however when the unit warms up sometimes it disappears. I do not own a scope right now.

 

[radardoug]

Sounds like you need professional help.

 

[Specsto]

Be nice

I took it to a couple techs that took my money and didn’t do anything.

Thank you for your response.

 

[radardoug]

Well thats terrible, but what did they tell you? You probably cant get parts from Yamaha, but it could be as simple as a blown diode bridge.

 

[Specsto]

They didn’t even open it up. I told them more than they could tell me. I’ll have to take the multimeter to it. Put it on here to see if anyone noticed a similar issue with an audio unit.
Yamaha told me to buy one of their new ones but i’m not happy with the TF line.
Thanks for the response.

 

[radardoug]

So is the hum on the audio?

 

[radardoug]

Does the desk run otherwise?

 

[Specsto]

So is the hum on the audio?

No it does not run through the audio.
The signal that overloads the signal does though. Both digital and analog.

 

[Specsto]

Does the desk run otherwise?

The desk runs perfect except for this ghost signal. Which is random sometimes. This forces me to not rin audio through it and only use it as a giant control surface. I’d love to use the the adat card I have and the tdif card

 

[radardoug]

So why do you think it is the transformer?

 

[ruairioflaherty]

I repaired one of these back in the dark ages. It was definitely not trivial but with care it was all pretty basic stuff too.

I have very vague memories of electro caps and phantom power being the issue in the unit I repaired

Did you say it's passing audio? Just showing this noise on the meters?

 

[Specsto]

So why do you think it is the transformer?

Only the hum is from the transformer.
This hum doesn’t enter the audio.

The spikes are random and I’m not sure yet what is causing it. This enters the audio both analog and digital.

 

[Specsto]

I repaired one of these back in the dark ages. It was definitely not trivial but with care it was all pretty basic stuff too.

I have very vague memories of electro caps and phantom power being the issue in the unit I repaired

Did you say it's passing audio? Just showing this noise on the meters?

As you see it randomly appears and disappears. It seems when I allow it to stay on for awhile it “stabilizes” and the error comes randomly. I could do a whole session without ch 12 and it would work and sometimes it will just kick in during a session, even when warm.
View attachment IMG_3953.mov

 

[PentaTech]

As a digital console repair tech, it appears noise is getting into your A-D converters. This points to a usual cause of such issues: filters. This, and everything we use has lifespan limited aluminum electrolytic surface mounted capacitors. Some typical values that cause issues like this when they fail are 3.3 uF at 10 V. These are very small and there are many in there. Replacing them is delicate bench work that requires specialized equipment. The cost to (professionally) repair benefit ratio is way out of propotion for this old gal. My advice would be to learn how to do surface mount repairs or look for alternative mixers.

 

[Specsto]

As a digital console repair tech, it appears noise is getting into your A-D converters. This points to a usual cause of such issues: filters. This, and everything we use has lifespan limited aluminum electrolytic surface mounted capacitors. Some typical values that cause issues like this when they fail are 3.3 uF at 10 V. These are very small and there are many in there. Replacing them is delicate bench work that requires specialized equipment. The cost to (professionally) repair benefit ratio is way out of propotion for this old gal. My advice would be to learn how to do surface mount repairs or look for alternative mixers.

I am ok with learning surface mount repairs. I figure it’s about time. I just love the versatility of this machine and I have a hard time contributing to electronic waste.

 

[johnR]

The last noisy 01V96 I repaired had faulty filter capacitors on the outputs of the switch-mode DC-DC converters in the power supply. This allowed HF noise onto the DC power rails which results in intermodulation products in the audio range, ie. audible noise. Replacing those electrolytic (through-hole) caps cured the problem.

 

[Specsto]

I suspected that at first from research. I will test and replace bad ones.

 

[Ike Zimbel]

Hi all anyone know what causes this. I hear a hum from transformer and will replace it eventually but I really want to get this issue dealt with. I love this mixer and it works well with my workflow except I can’t pass audio through it because of this issue. It happens on startup now however when the unit warms up sometimes it disappears. I do not own a scope right now.

Is the fault only happening on the three channels that were showing Peak indications? If the fault is across all channels, that points to a power supply issue. If it is only on specific channels, that points to other, more localized issues.

 

[Specsto]

Is the fault only happening on the three channels that were showing Peak indications? If the fault is across all channels, that points to a power supply issue. If it is only on specific channels, that points to other, more localized issues.

Hi thanks for the reply. I believe the first video shows all channels. It certainly changes though. I will look into the power supply caps.

 

[Whoops]

That mixer is ancient digital technology, having more than 20 years now it needs for sure a complete Electrolytic capacitor Recap job, probably if you do that the problem will be solved. So try that first

I personally would just replace that mixer completely, unfortunately had to use those mixers a lot of times in the past, the sound of those earlier Yamaha digital mixer was horrendous, it's completely outdated nowadays in terms of features, internal processing (Eq,Comp,Effects) and sounds worst than anything that's out there in the present.