Mackie speaker repair
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Mackie Speaker Repair Parts
I received two Mackie SRM amplifiers that had the same problem: both powered on but did not reproduce any sound apart from some louder than normal hiss and a very noticeable pop when turning up the volume. Read further if you want to learn more about the repair…. The repair is finished, but this has not resolved the possible root cause of the defect. This is a preventative measure to increase the longevity of these regulators.
Very helpful post. I had two srm units fail in one week and both had virtually the same U9 readings you described. Do you have a link to it? The link does not seem to exist any longer. The replacement parts needed does not match the ic chip, was given a 3pin regulator instead.
Not the same as pictured, or am I getting it wrong? Pls advice. Abdul, please note that a lot of electronic components are available in different packages. I also had. Thank you again.. All done, I also added the 1n switching diodes. Getting the IC off was fun, I floated it, but it still did not want to play nice… thanks a again, saved a bunch. Is there a problem with my input to the mixing board and if so do you have any advice.
If the voltages are present, then it is a short circuit on the mixing board. If the voltage is missing, it should be the power supply. Thanks for posting this! I did the repair with MC79L and I did the service bulletin fix with the diodes.
Anyway, the amp works fine now. Good as new, maybe better. Any body has single line diagram fro Mackie SRM ? I really needs it please smartbuild yahoo. Is the covered heat shrink 1n going in the opposite or the same direction as the uncovered. Btw…thank you very much for this tutorial!! The diodes were easy. That said, there is speaker output and no pop when powering off. My workaround for years is simply to adjust volume on the channels and leave the Main pot at On each unit, input power is okay, and the voltage on both ICs check out okay.
Any helpful thoughts? With appreciation for any quick thoughts you can share. It is an easy fix and less work than replacing the regulators. I appreciate the response!
Your email address will not be published. Save my name, email, and website in this browser for the next time I comment. Read further if you want to learn more about the repair… Problem When powering the SRM speaker, the blue power LED lights up and you hear a noticeable hiss coming out of the speaker, even with the MAIN level completely turned down.
Turning the MAIN level above 5 makes a loud popping sound and the cone of the speaker visibly travels backwards very hard. No output from the speaker when feeding in a signal. Disassembly Start with removing the six volume and EQ knobs by pulling them off. Pull them firmly, but do no wiggle them. If needed, wedge them loose with a plastic spudger. Remove the four screws in the outer corners of the mixing panel with a Phillips 1 screwdriver.
Remove the five screws near the bottom surrounding the three inputs with a Phillips 0 screwdriver. Remove the four remaining machine screws with a Torx T8 screwdriver. Since there are no screws left, you should be able to lift the metal face plate of the mixing panel, exposing the printed circuit board that holds the components of the mixer.
We will be replacing the integrated circuits marked 9L15A or 8L15A, depending on which one is defective. Diagnosis Measure the voltage on the two right pins of J4, you should get about 25V. Measure the voltage on the two center pins of J4, you should get about 25V.
If you get twice 25V, the input power for the mixing board is OK. If it is V it is OK, if it is less I measured 0. When looking at the board with the connectors facing upwards like on the photo , pin 1 is the the top right one and pin 5 is the bottom left one. If it is 15V it is OK, if it is less, we will replace this integrated circuit.
In my case the voltage was 15V. When looking at the board with the connectors facing upwards like on the photo , pin 1 is the the top right one and pin 6 is the the second from left on the bottom row of pins. Repair Power down the SRM with the power switch on the back and unplug the mains lead. Unseat the red spade connector of the green ground wire from the circuit board.
Wiggle gently to loosen it. Use needle nose pliers to grip the spade connector if needed. Lift the lower part of the circuit board up and out of the enclosure. Disconnect the three connectors at the top of the board.
The board should now be loose and you can remove it completely. Remove the defective integrated circuit. As these are surface mount components, this is not easy but not impossible. I normally use a hot air soldering gun for a task like this, but the surrounding electrolytic capacitors make the integrated circuit hard to reach. I decided to perform the operation with a soldering iron: add lots of solder to one row of pins so that all of them are soaked in a liquid solder blob.
While heating the blob with your soldering iron, lift that part of the integrated circuit from the board by prying between the integrated circuit and the board with a fine flat screwdriver. Try so perform this as swift as possible to mitigate overheating of the boards, otherwise the copper traces and pads could loosen due to excessive heat.
But also be gentle, prying to hard could also lift a solder pad. Repeat for the row of pins on the other site of the integrated circuit. This should free the defective component from the board. This time you can use tweezers to hold the integrated circuit and lift if from the circuit board. There is now probably some excess solder on the board. Remove it with desoldering braid. You can see on the photo that I was a bit to harsh and I lifted the pad for pin 4 top left on the photo. Luckily, this pin is not connected and the pad leads nowhere.
Add a little bit of solder to one of the corner pads for the integrated circuit. Place the new integrated circuit over it and apply heat with your soldering iron. Reheat the solder joint if necessary to reposition the integrated circuit with the tweezers. When positioned correctly, solder the remainder of the pads. Check to make sure that there are no solder bridges between the pads. Make it better The repair is finished, but this has not resolved the possible root cause of the defect.
So better to add these two diodes before connecting the PCB again and closing it all up! The repair tutorial was just what I needed. Clear, concise. Great pictures. Thanx, Sal. You can find more info if you look for the data sheet of this part by ON Semiconductor. Nice work! My symptoms are blue mains light comes on on but no sound, hiss, hum or crackle at all. His amp broke recently, and made the same type of noises that you described. U9 was not working.
The parts just arrived in the mail. Well, today was the big day. Your instructions were so clear, almost like making chicken soup out of a clear recipe. I lucked out and the one unit is done and working. One more to go. I can not thank you enough.
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Mackie Speaker Repair Center
RELATED VIDEO: Mackie HR824 Amplified Speaker RepairI love my Mackie HR monitors. I also use them for music and video production monitoring and they never fail to provide an accurate representation of the source material. I bought these speakers maybe eight years ago and they have performed flawlessly…until a year or so ago that is. These speakers have a circuit that automatically turns on the amplifiers when an input signal is detected, and you can see the pilot light on the front panel come on when this happens. What happened was that one of the HRs started having trouble turning on. The pilot light would flash on and off a few times before the speaker would finally stay on.
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I received two Mackie SRM amplifiers that had the same problem: both powered on but did not reproduce any sound apart from some louder than normal hiss and a very noticeable pop when turning up the volume. Read further if you want to learn more about the repair…. The repair is finished, but this has not resolved the possible root cause of the defect. This is a preventative measure to increase the longevity of these regulators. Very helpful post.
Mackie mixer repair
Go To Bulletins. Make sure all transistors and ic amps ar Take every safety precaution to protect yourself while doing this test. Make a small loading rc circuit as shown in the diagram below, and connect the ac volt meter between the ac power source ground and any
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