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Author Topic: Fader issue on a Presonus 16.4.2  (Read 11640 times)

Jonathan Goodall

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Fader issue on a Presonus 16.4.2
« on: September 22, 2013, 01:16:56 am »

Hi, I got asked to have a look at an issue at a local church today.
Just over 12 months ago (so just out of warranty  ::) ) they purchased a new Presonus 16.4.2 and it has worked well for their use, but today a channel wouldn't turn off when the fader is pulled down to infinity (ie still passed audio to the main outputs).
I had a look on the  UC software and offending channel showed the fader being at just under unity even though it was right down on the desk. 
If you move the fader on the desk to the -60 position (a movement of about ~3-5mm), the fader on the UC dropped to infinity and audio stopped passing to the main outs.
 Any movement above that point results in the fader postion on the UC jumping back up to almost the unity position and rapidly jittering up and down as you slowly raise the physical fader.
 As you pull the fader back down the reverse happens (UC fader jitters rapidly up and down until you reach -60 then drops to infinity until the physical fader reaches infinity at which point the UC fader jumps back up to ~ Unity).
At this point in time troubleshooting digital desks isn't my strong point but I did try doing a Factory reset which didn't help the problem and I am fairly certain the firmware was up to date and the faders are not set to lock-out.
If it was an analog desk I would suggest that the fader was dodgy but can anyone suggest any other things I may have missed?

Cheers, thanks for your time  :)

(PS I tried searching the Presonus site and a few fader issues popped up but not quite like this one.  Also for some reason I don't seem to be able to register to ask a question on their tech support thread)
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Tim Perry

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Re: Fader issue on a Presonus 16.4.2
« Reply #1 on: September 22, 2013, 04:40:26 am »

The fader is broken. It is not a "digital" problem.

Kudos for the comprehensive explanation of the problem.

It might be dirt or gunk from a spill.
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Jonathan Goodall

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Re: Fader issue on a Presonus 16.4.2
« Reply #2 on: September 22, 2013, 05:04:37 am »

Thanks for the reply.
I might try blowing some canned air through the fader and see if it helps,  just in case (no sign of any spillage) but it looks like a trip back to the suppliers is in the wind.
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Bob Leonard

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Re: Fader issue on a Presonus 16.4.2
« Reply #3 on: September 22, 2013, 09:13:20 am »

Canned air on faders can make the problem worse by driving and spreading the dirt or foreign object deeper into the fader. Use some cleaner and a shop vac. Spray the cleaner into the fader, put the vac hose over the fader knob and slowly slide the fader up and down with the vac turned on.
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John Roberts {JR}

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Re: Fader issue on a Presonus 16.4.2
« Reply #4 on: September 22, 2013, 09:28:06 am »

It may be a bad solder connection.

JR
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Mike Sullivan

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Re: Fader issue on a Presonus 16.4.2
« Reply #5 on: September 22, 2013, 09:46:58 am »

I had the exact same issue with Ch. 3 on my 24.4.2.  Seems to have worked itself out now, so it may just be dirt/debris.  Originally, mine was having issues being read, so the sensor would have the fader jump around quite a bit, then it would do the same thing you're doing...checked it a few weeks ago, no issues like that anymore (it was being weird, coming up when I brought the Ch 2 fader up a bit), but checked it today and I'm not having any issues anymore.  May just need a good cleaning.
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Chuck Simon

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Re: Fader issue on a Presonus 16.4.2
« Reply #6 on: September 22, 2013, 09:53:58 am »

You may have a bad fader.  Put in a service ticket with Presonus.  You will get a response wthin 24 hours.

http://support.presonus.com/home.
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Jonathan Goodall

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Re: Fader issue on a Presonus 16.4.2
« Reply #7 on: September 22, 2013, 06:41:10 pm »

Canned air on faders can make the problem worse by driving and spreading the dirt or foreign object deeper into the fader. Use some cleaner and a shop vac. Spray the cleaner into the fader, put the vac hose over the fader knob and slowly slide the fader up and down with the vac turned on.

By cleaner, do you mean something like Caig Deoxit? (Which I have)

Thanks
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Stu McDoniel

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Re: Fader issue on a Presonus 16.4.2
« Reply #8 on: September 22, 2013, 07:59:42 pm »

By cleaner, do you mean something like Caig Deoxit? (Which I have)

Thanks
You had better use what the service manual for that model tells you to use.  With faders there is lubricant involved as well as cleaning.
If you are not sure what to use then do not attempt this.
Contact the manufacturer Jonathan.
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Tim Perry

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Re: Fader issue on a Presonus 16.4.2
« Reply #9 on: September 22, 2013, 10:08:27 pm »

By cleaner, do you mean something like Caig Deoxit? (Which I have)

Thanks

quote from a Presonus tech "Presonus doesn't recommend the use of anything but low pressure dry air"

Deoxit may provide a short term fix, but like a junkie, it soon wants more.

Sometimes the resistive film is simply worn out and no amount of spraying will be productive.
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ProSoundWeb Community

Re: Fader issue on a Presonus 16.4.2
« Reply #9 on: September 22, 2013, 10:08:27 pm »


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