Mackie HUI fader calibration

Hello everybody,

I've been lurking around this forum for some time and found it to be a great ressource of information not to be seen anywhere else...

This is my first post and I'm asking you a question I had posted over at gearslutz before (unfortunately with little result...)

On my Mackie HUI I have one fader that can no longer be calibrated to its nominal level ("1000") in self test mode. This fader is going to be replaced, following the advice of a Mackie tech...

The bigger problem is fader touch sensitivity: Fader #2 is either not touch sensitive at all, not touch sensitive in combination with other faders or becomes overly sensitive - which leads to DAW tracks randomly selecting themselves.
So this is the question: Does anybody have the "official" procedure for HUI fader touch sense calibration? (Test points, voltages?)
OR: Can anybody point me to a source for a service manual?

BTW fellow gearslutz told me some HUIs will never work right and you basically have to throw them out of the window...but I really like the HUI and would prefer to get it working!

Thank you all.

Stefan

we were dealing with that at work l with a few of our clients systems. I called Mackie and they will not release that information. I called my friends who work at an authorized mackie service center in town and they do not have a repair manual for it. Looks like the best thing to do is replace it. They are pretty old anyway and if your running Pro Tools the command 8 seems the better choice.

repiar with a shotgun as needed. :evil:

@ Roger: I had the HUI opened more often then I wished to, but I can't really understand what kind of frame one should need to repair it...apart from having to remove the fader servo control pcb to access the faders it seems pretty straight forward to me...

Anyway: Thanks to a very kind person on this board (who's name is obviously not to be disclosed) I do have the fader calibration procedures now...If anybody needs some hints...

Thank you,
Stefan

thought I would post an update:

Changed one one fader today (the one that was not calibrateable to 1000)
still not better with the new fader!!!
Mackie tech advice: change fader board first (465?), recalibrate,if not better change servo board (250?)... oh man what can I say.

BTW recalibrating touch sense with the official procedure worked perfectly...

Stefan

Use a Mackie, Go To Jail. It's the LAW.

No wait, a bad song done quick,.... how does it go?

use the bits to make ur own custom controller from ucapps.de :green:

motorfaders/touchsensors/encoders and plenty other bells n whistles supported...

Well looks like a waste of time to carry my HUI to Bangkok to a tech...
DRAT!!!

It has been having increasing difficulty to turn on.
Took a few times with the switch etc. finally if caught..
like an old lawnmower.

I finally started leaving it on 24/7, since it controls the monitors.
Well the electrician pulled the plug to wire across the loose sockets
to installed sockets in the floor, and boom no more HUI.

It will draw current at switch on, and heats the room nicely,
but not enough to go into a boot cycle.

If there IS a schematic floating around,
I would love if one wandered my way....

If not I need to figure a new 5.1 system controler.
I had been using time lines and occasionally event lists too,
MUCH more than sliders. I really don't miss mixing boards that much except during carpel tunnel incidents.

These things need really good earth connection.

Odd that you mention that.

Thailand electricians have a FEAR of earth ground in houses.
Most everyone goes shoeless most everywhere indoors.
And somebody got it in their heads that having earth ground
will short a person to ground, not the other way round.

And this old wives tale has been perpetuated beyond ALL LOGIC...

I had gone through at LEAST 4 electricians before finding one
who WOULD do ground as I asked.
So I believe there is a ground.

I have metal poles coming out of the control room
and main room cement beam steel frames,
and running to earth AND to the audio lines
and after the 5k watt UPS that powers all studio devices.

No the unit is just heading south fast,
I suspect maybe PS issues. But not having any info on it,
it's on'y random guessing.

Well that's a true horror story.
I suspect managment wouldn't be happy hearing that one.
But then again it may be a business culture issue as you imply.

I emailed the reapair shop here, no answer, but it IS thailand...
I am on a flight at 8:15 and leave in 20 minutes when the coffee kicks in.
I ain't carrying the sucker with me till I KNOW it has a chance of repair.

ssssnnnnnzzzzzz.
COFFEE!!! NOW!

I got no email reply and finally called them.

The guy didn't even recognize the HUI name as a product.
Musta been before his time.... This is a speaker company,
nothing I saw says boards or processors, pro audio:
auto and small PA drivers that's it.

I yanked the thing open and one of a pair of large
4700uf PS caps is bubbled up enough that it's silver metal top is gone.
Gotta find that top.

I did find a similar cap on the island and will install it tomorrow,
when I am less tired. I did 80km on a motorcycle with 12 stops today,
a full island circuit+.

Hopefully THAT cap is the only casualty.
I have the Thai rep trying to get a schematic,
and a message to LOUD about getting me one.

Ah yes the wonky master volume pot... and slider chatter.
That pot is on the other side of a wierdly mounted BIG mother board.
How DOES one get to it???
To be addressed.

I await developments.

Well a guy at LOUD after reading my tale of woe,
and my explaining my technical abilities has emailed me
A COMPLETE repair / assembly manual and schematics.

6 pdf files, covering from a glance the whole shooting match.
I have found my VISIBLE problem is one of the two BIG filter caps
for the PS was pear shaped, almost literaly and so the -15v rail, at minimum, was a no show.
Still printing them out.
I have the PS pon the work bench and the ca0p replaced,.
I will crank it up after I can read the PS schems a bit more.

The hardest will be figuring how to get at the master volume pot
to replace or spray, it is on the face of the BIG mohter board,
and not clear how you get in there...

Well progress anyways.
D :grin:

Please share them PDF's by sending them to the Group email

Kz

Well a guy at LOUD after reading my tale of woe,
and my explaining my technical abilities has emailed me
A COMPLETE repair / assembly manual and schematics.

6 pdf files, covering from a glance the whole shooting match.
I have found my VISIBLE problem is one of the two BIG filter caps
for the PS was pear shaped, almost literaly and so the -15v rail, at minimum, was a no show.
Still printing them out.
I have the PS pon the work bench and the ca0p replaced,.
I will crank it up after I can read the PS schems a bit more.

The hardest will be figuring how to get at the master volume pot
to replace or spray, it is on the face of the BIG mohter board,
and not clear how you get in there...

Well progress anyways.
D :grin:

Well this is a yes and a no... and a loud DRAT.

Got the 15v up no problem but spend much of the day
finding why the 5v and 12v were gone,
and why it was not anywhere on the schematic...
AH! the SOURCE is NOT THERE....

And though the guy at LOUD has been trying to help,
he says much of the legacy data has been lost...
So much for corporate reshuffles.
The real knowlegable cats like PRR, get shuffeled off
and replaced with ass kissers and clueless young turks.
Mean while their experience and mental filebox goes walkabout,
and someone who doesn't realize the value of all that paperwork
left in that tech office file cabinet decides to do an 'executive decision'
and toss it all.
Oops, sorry old customers; just as your unit needs service,
we are now clueless how to do it, but trying.

A second dead power supply.... yada yada.
YES campers, Mackie outsourced a switching power supply
an ASTEC LPT62,
which fortunately seems to still be available,
if not currently on Emerson / Astec's list of products.

I had to tell Mackie where it came from....

I noticed it was a different looking PCB, and there was a a label on a
big cap that under better lighting proved to be the P.S. makers label.
But it was an aggravating day till that was discovered...

Mouser and Farnell have them
http://uk.farnell.com/jsp/search/productdetail.jsp?sku=768571&N=401

But if anybody has a schematic for this
ASTEC LPT62 P.S, I'd like to see if I can fix it first.

This has been a snipe hunt for sure.
But I need a speaker controler NOW at the very least.
and occasionally some sliders and knobs to twirl.

Still no joy, but someone is looking locally for a PS.

I am uploading the repair manual and my addendums to groupdiy.
Just sending it as an email to the inbox.

Next AM:
well looks like it got there.
My read me came up as an html. Alls well.