Question about Mackie 1604 Vlz3 16 Channel Mixer

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Volume drop and have to hit input hard to get it to start working

Older rack mount board, I was told would cost more to fix than a new one? works great most of the time after you pop it with a hard input. Recently started popping when you touch any xlr in the back. Like a short. ? I have some electronic experience but wanted to know if this was terminal? thanks

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  • kodii Feb 08, 2009

    I have a 1604 VLZPro which has the same problem. On headphones the things great but when using the rear main outputs one side goes down & the only way to get it back up is to crank up the trim pot to clip levels. I wouldn't mind so much but as my monitors are Genelecs I'd rather not!!! It's been back to be fixed.....waited AGES to get it back for a part that is difficult to source now and still no joy. Any help would be great!

  • Anonymous May 12, 2009

    I have a 1604 VLZPro with the same problem. The volume coming from the main outputs the will drop down significantly. Also, the level of one row of master channel output LEDs will drop to almost nothing so you can clearly see that it is happening. The only way to get it back up is to temporarily crank up the trim on one of the 16 channels. Then the overall mix will go back up to normal volume and the master output LEDs will once again display at pretty much equal levels. But it just happen again later.



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Re-solder input jack connection to the board. Sounds like cold solder joints.

Posted on May 29, 2009


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Have a marshall mg250dfx from usa so it is 110 v but i'm over seas and I use it with a step down transformer 220in-110out and it worked perfectly for some time but today wile i was playing it started...

Assuming the power in is good (I would check that first though, AC voltage going into the amp), then plug a patch cord(any 1/4" to 1/4") cord into the effects loop on the back of the amp and insert and remove a plug into the headphone jack a number of times to clean the contacts(headphone jacks and effects loop jacks are normally switching jacks that pass audio when not in use). Still not working?... If the pots(gain, volume and tone controls, etc.) are scratchy that could be the issue. The input jack could be the cause(damaged, cracked solder or circuit board trace). Wiggle the input jack to see if that causes or corrects the problem. A little WD-40 works wonders on correcting dirty jack issues. If none of the above are the cause then it is likely a cracked solder joint, trace or component lead which would have to be resoldered/repaired (maybe dirty contacts between the small effects board and the main board). Also watch the overdrive channel LED when the audio drops. If the LED goes off could be a power supply issue or a channel switching issue. Tapping on the amp will help indicate bad connections, cracked component leads or damaged traces.

Jul 03, 2013 | Music

1 Answer

Volume is low when i use cd input

What kind of CD unit are you using? Is it a portable, rack-mount, stand-alone, or via computer output? This information is necessary. I will be glad to help otherwise.

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My DTXPRESS 4 was dropped on the ground . Not too hard but none the less dropped. now the kick wont trigger from the drum brain. Where can i get it fixed ?

This depends if the cables were plugged in or not...If they were, probably the jack for the defective input has had the solder to the board broken OR the cable has been damaged. Move the kick to a tom inout and see if the trigger works... If it does, then the Kick inout connector is probably broken away from the solder. Unit will have to be opened for inspection to find the defect. If the kick doesn't work at all in the other position, the cable from the kick MAY have been stretched or brolen.

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A new DM7 drum set line out has very low output. It is connected with drum combo Stagg EDA40 and if combo drum inputs are used there is practically nothing to hear . With combo maximum volume there is...

The sound on all the stock kits I found to be too low. What I did was create a custom kit and altered the dynamics of all the pads and cymbals - once you're in the dynamics settings, just hit the pads/cymbals the hardest you normally would and save that setting!

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How do you install the rear rack ears

I don't know about the Peavey amp but most have rack holes that run parallel with the amp's side panels. On the rear of the rack this requires a mounting kit unique to your rack (provided there are mounting rails present) or some creative strapping to properly stabilize the amp. I've seen tech's anchor the rear mounts to the inside of the rack walls. Wood is easiest (and strongest) to work with but fiberglass mounts with fender washers also creates a pretty strong mount....G.

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Keystation 61 key won't play

Most of these use conductive rubber pills that are pressed onto circuit board traces by the keys.

Clean the board AND the pills with 99% isoprophyl alcohol and QTips.

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1 Answer

My marshall mg100hdfx digital fx rack wont work

sounds like the effects module has stopped working . you could try re-working the joints around the i.cs on that board if you have a rework station. i have only managed to repair one baord this way suggest replacement is the best course of action. uk cost of panel approx £50.00 + fitting

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1 Answer

When striking 3 keys key nomber;11 b flat;13 c;15 d,the volume is very high in level with all there any way i can repair or overcome this. this is in full keyboard mode thank you

Is it a dynamics sensing keyboard (does it sound soft when you play softly and loud when you hit the keys hard)?

If so, you need to clean the double contact under those keys that sound too loud (if contacts are dirty, the key might either not work at all or it may loose the ability to sense how hard you hit it and will work at full volume).

You'l probably need to disassemble the unit and remove the keyboard to be able to remove the keys that don't work well, after you've done so, you need to clean the lower (under) side of the double rubber button which is struck by the key when you hit it, also be sure to clean the contact tabs on the circuit board undereath the rubber pad (you can use ethyl or isopropyl alcohol and "cotton sticks").

This should do the trick if the contacts are dirty, but it may have no effect if they are damaged or worn out (in such case you would have to replace the rubber pad for that particular key).


3rq8 (Triarcuate)

Jul 31, 2009 | Music

3 Answers

Not getting enough distortion(esp ltd ax-260)


It's not your pickups. It would be nearly impossible to loosen a wire inside of your guitar by having even heavier than your amp head drop on it. It is most likely your volume pot. The post, if hit hard enough, can virtually distroy your pots. Another possibility could be your jack, al though considering where it's located on your guitar, it would be very hard to damage it by having something drop onto it.

There is little else that could be the problem. Hopefully you didn't damage your guitar too badly. If the guitar was in front of me, it would be a relatively easy diagnosis.

Fortunately, volume and tone pots are inexpensive, and if you're handy with a soldering iron (or you have a friend that is) it is an easy install with four to six solder points, depending on your configuration. I don't want to assume it's a stock setup, but when you take off the rear electronics cover, you will immediately see what configuration you have.

If you have possibly damaged the pickup bobbins (assuming you have the stock humbuckers in your guitar), you would be able to see the damage, It would either look damaged,or work correctly. As you know bobbuns are simply wound wire, and that's not easy to damage. Plus your strings provide a minimal amount of protection, unless your amp head slammed it very hard. Start by replacing the volume pot. Cheapest parts first. There is no way to test the pot with anything like a potentiometer, because there is virtually no voltage that passes through the pot. Additionally, unless you have active pickups, your pickups cannot be either. If you do have to replace your electronics, you can find a large variety and even upgrade your parts by searching eBay. The good thing is that you havce a guitar, and guitar parts are abundant, relatively cheap, and most people change out electronics just to achieve a different sound.

If you are so inclined, most good guitar shops will diagnose your problem for cheap and apply the cost of the diagnosis to the cost of the repair. Good luck, and I hope I have given you some information to work with.

Thank you for using FixYa

Jun 19, 2009 | ESP Ltd EX-50 Electric Guitar

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