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When I pulled my SL 16.4.2 apart .......
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PhilG
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Joined: 29/07/2010 01:46:55
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This was supposed to be a short guide on how to replace the power supply on a 16.4.2 desk as the directions I got were pretty rubbish

I hit a few speed bumps along the way I thought this would be the case so I documented it all with photos so if anyone else ever needs to do this they have some idea of how it should go!

Presonus will do this fix for free and did offer me the free fix but it was going to cost me over $700AUD to post it to them - Credit to them they organised Rode in Australia to fix it for me but it was still going to cost me just over $200 to get it there and I have 2 gigs this weekend with no backup!

Rode were pretty good about the whole thing and sent me the power supply board that Presonus had sent them - it arrived today in the psot so I got to it

From here on out I will give you a rough guide on how to perform the swap

The offending board with Aux output noise


put the mixer on its side and balance it in the shipping foam or whatever you have handy, remove the 3 screws on the side as indicated you need to give the side facia a good hit with something like a rubber hammer or the rubber handle of a large screwdriver - they slide forward about 1cm then lift off ( I had to encourage them off with a flat blade screwdriver )


remove the 16 small screws on the side panel c- you can leave the large 3 screws on

repeat on the other side



remove the 5 screws from the underside of the mixer - this is best done with the mixer on its side as it will balance with ease without the sides on


remove the 5 screws above the xlr inputs as showen - BEWARE!!!! these screws have a different phillips head on them and seem to be made of a different material you will need a good fitting phillips to get these out or you will damage the heads


remove the 4x2mm hex bolts around the gain knobs


remove the gain knobs - I used a small piece of cardboard underneath a flat blade screwdriver as not to damage the overlay



I didnt take any pics here but you need to disconnect several cables so you can pull the control surface off - these are the only instructions I had
1. The large grey 20 pin ribbon cable which connects the control surface to the DSP board.
2. The small 3 pin cable which connects the control surface to the power board.
3. The two pin cable which connects the BNC lamp to the power board. This cable is usually also taped to the chassis. Remove the tape and pull the cable free of the chassis before you remove the control surface.
4. The film strip cable which connects the LCD module to the DSP board.
5. The small two pin cable cable just above the filmstrip cable which connects the LCD module to the DSP board.
6. The long grey 3 pin cable which connects the headphone jack to the DSP board. This cable should be disconnected from the DSP board by turning the open left side of themixer to face you. It will be easy to see the port that the cable connects to from this perspective.

If you have a good look you will have no problems in locating them - you can now remove the control surface from the chassis


This will reveal the offending power supply board


Old board top - New board below - you can see a much larger transformer? at the bottom right of the board also the relocation of a few components and connections

There are 6 silver screws on the surface of the board you will need to remove and 3 on the rear of the chassis



Fit the new power supply board




From here it should have beem smooth sailing took me about 20 minutes to get this far and 10 mins to put it all back together - I powered the desk up all the lights came on exept one - the backlight for the lcd - so I thought fine I must have missed a connection - I opened it back up and found the connector ( step 5 from the section above ) and it was plugged in. Now I got worried - I pulled out my multi meter and tested at the plug for voltage - good I got 3.88v signal to the backlight but still no backlight.

Time to pull the lcd display out !!! From here on in I will only show photos as it gets a bit funky to pull the control board apart!



The offender!! a broken solder connection on the side of the lcd display

All fixed!

Testing the repair with the board open DO NOT TRY THIS AT HOME!

All back together and working!


The power supply works great and the Aux noise has gone thanks Presonus and Rode!

2 small things I noticed while poking around - first pic has a connector labled POWER SUPPLY with nothing connected to it - this is off the back of the DSP board

second one is on the control surface board there is a spade terminal with GND labled with no ground cable connected to it - all the others on the board all have heavy guage earth cable attached just not this one ! you can also see the USB 2.0 port here that installs as a human interface device - backup firmware reflashing port maby ?

This message was edited 2 times. Last update was at 30/08/2010 10:33:18


2 x SL16.4.2's
Audiobox USB
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AMD FX-4170 / 16GB DDR3 / Win7x64 / Via 6308FW Onboard
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Monolithent
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Brilliant job Phil.

And good eye catching that popped connection.

What did Pesonus say about the warranty if you popped it open yourself?

Any other things to watch out for during disassembly? Not that I'm thinking I'll ever have to but......
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PhilG
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Monolithent wrote:Brilliant job Phil.

And good eye catching that popped connection.

What did Pesonus say about the warranty if you popped it open yourself?

Any other things to watch out for during disassembly? Not that I'm thinking I'll ever have to but......


was out of warranty anyway we only get 12 months here in Aus.

The hardest thing of all during the stripping down is pulling the film cable that drives the lcd panel out without breaking the clips - they pop off really without any effort, you can see it in the last picture the brown thin ribbon style cable - its also a pain in the ass to get back in

2 x SL16.4.2's
Audiobox USB
Studio One V2 Pro
/ Rack System
AMD FX-4170 / 16GB DDR3 / Win7x64 / Via 6308FW Onboard
/Mobile System
Toshiba Satellite P200 / 8GB DDR2 / Win7x64 / Ti FW & i7 13" MBP
/Wireless
Ipad v1 16gb - Samsung Galaxy Tab - Asus Black Diamond router

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mattaudio
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Great to know that PreSonus treats customers well even after the warranty has expired. Compare that to so many other companies we know out there who could care less about their firmware, or do whatever they can to avoid warranty support. That's part of the reason why I am so happy with my StudioLive.

What were the known issues with the first few hundred StudioLives? I bought mine on May 23, 2009. What are the symptoms of this power supply issue?

The only strange thing I've ever noticed is that sometimes a channel on my meter bridge will show some audio coming through from another channel, even when it's muted. But it is never audible so I've never worried about it.
Big Joe Daddy
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Holy Smokes Phil!
Nice job putting that set of photos and instructions together. I know that took some work. I'll bet you spent as much time (or more) putting the photos together and annotating things, as you did fixing the board. Maybe Presonus should 'sticky' this thread so others will be able to find it in the future.
Thanks for all your work.
BJD
StudioLive 24.4.2 | StudioLive 16.4.2 | StudioLive 16.0.2 | QSC K Series 10's, 12's, Subs | Fractal Axe-FX II | Mac Pro - OS X 10.7.4, 2.66 GHz Quad-Core Intel Xeon, 2TB RAID, 16GB | MacBook Pro | iPad 64GB | Studio One v2.5 | an old watch, a lamp, and a box of crayons
MikeRivers
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Big Joe Daddy wrote:Holy Smokes Phil!
Nice job putting that set of photos and instructions together. I know that took some work. I'll bet you spent as much time (or more) putting the photos together and annotating things, as you did fixing the board.

He probably had an ulterior motive - to be able to get it back together. When I take something like this apart, I'll occasionally take a photo to remind me of how a cable was routed before I remove it, and I usually put related hardware in its own private Altoids box. That way if I can remember which box has the screws that go around the outside of the case, I'll be able to find all of them.

Maybe Presonus should 'sticky' this thread so others will be able to find it in the future.

Good idea, but maybe PreSounus doesn't want to encourage their customers to take their equipment apart. Phil obviously knew what he was getting into, but not everyone who buys this gear knows what to expect inside. Time was when all pro audio gear had full service documentation including parts lists and schematics right in the instruction manual. Now you're lucky if they tell you where the line fuse is located.
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greggreg
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Joined: 26/08/2010 06:09:44
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Thanks for the look inside Phil. Very interesting to those of us who aren't afraid to pull apart gear (I'm an EE and Computer Engineer). Much easier to pull apart than my old Mackie 1604. Rotopod: good idea, cheap ribbon connectors: bad idea. After randomly dropping channels, Auxs, and the left main - and repeatatively taking it apart to clean connectors, I moved up - way up! - to the SL. The Mackie would take me 1.5 hours to peel apart ... including removal of all 100+ knobs! I like Mackie gear - I use 450s for mains and 350s for monitors - but the 1604 was becoming bad trouble.
Also, really nice to hear about the Presonus support you got.
PhilG
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one thing I did notice that alot of people might want to know - the headphone jack can be relocated pretty much anywhere on the case - the cable it is connected to is very long - much longer than needed - you could drill a 1/4" hole in the chassis and remount it anywhere you like - I know thi shas been a problem for alot of people with the case blocking the jack off

2 x SL16.4.2's
Audiobox USB
Studio One V2 Pro
/ Rack System
AMD FX-4170 / 16GB DDR3 / Win7x64 / Via 6308FW Onboard
/Mobile System
Toshiba Satellite P200 / 8GB DDR2 / Win7x64 / Ti FW & i7 13" MBP
/Wireless
Ipad v1 16gb - Samsung Galaxy Tab - Asus Black Diamond router

[Email] [WWW] [ICQ]
rickonpender
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The further I scrolled down in your pictures the more of an anxiety attack I started to experience...Glad I live in Canada, so it will be so much easier for me to send to Presonus for any repairs!
Good work and nice tutorial !

ROP
smashaudio
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Joined: 31/07/2010 16:30:08
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PhilG wrote:
was out of warranty anyway we only get 12 months here in Aus.

The hardest thing of all during the stripping down is pulling the film cable that drives the lcd panel out without breaking the clips - they pop off really without any effort, you can see it in the last picture the brown thin ribbon style cable - its also a pain in the ass to get back in



read up on the fair trading act of victoria...what i've been told (and i'm a soundy guy, not a lawyer), if it breaks down (breaking down and wearing out are different) within a reasonable amount of time, the retailer is still on the hook.

also selling an extended warranty is illegal.
desvosound
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Hi ,

I am Richard from Mauritius and i have been trying hard to find a few references of components on my FAULTY SL 16.4.2 POWER SUPPLY BOARD model P/N: 400-PG1PWR(H).
I would be grateful if you could give me some refs from your old board if you still have it for i could not get any circuit diagram from presonus.

Specifications of IC U4 found on primary section of the power supply and the value of RESISTOR R26 (THE NUMBER MARKED ON IT)

Thanks in advance

Regards
Richard
PhilG
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super old thread.

Not sure of the specs sorry I never bothered to check

2 x SL16.4.2's
Audiobox USB
Studio One V2 Pro
/ Rack System
AMD FX-4170 / 16GB DDR3 / Win7x64 / Via 6308FW Onboard
/Mobile System
Toshiba Satellite P200 / 8GB DDR2 / Win7x64 / Ti FW & i7 13" MBP
/Wireless
Ipad v1 16gb - Samsung Galaxy Tab - Asus Black Diamond router

[Email] [WWW] [ICQ]
techxpect
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Thanks for sharing your learning! I had a similar experience with Presonus tech support. I just needed a few gain pots and they sent them to me no charge... good people. When I set out to open "Humpty Dumpty" I was a bit perplexed. After removing 75% of the hardware, and still no cracked egg, I deceided to sleep on it. Your photos and description are awesome What did you use to put the slide show together?
 
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