Question about Mackie SRM-450 System

1 Answer

Mackie 450 thermal light on no sound

When the speaker is powered all the lights come on thermal, peak and on all light up. No sound. checked the internal board and all seems to be visually ok.

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  • 7 Answers

Could you give some more info? what are your running into your speaker? and how exactly is it run? once we weed out common issues like switched up cables, than we can move on to internals.
which on that note, I think this is a manufacturing defect


here's a link to the schematic if you want to go poking around the circuits.....


http://www.mediafire.com/?myion3zkxn3


or
http://www.mediafire.com/file/myion3zkxn3/Mackie-SRM450 actspk.pdf



take a resistance test between D56 pin1 and Q35 pin2. thats where this issue seems to be stemming from from ones ive worked on. I have know it to be an internal track that was broken and needed to be glued back down. definitely not the first time ive seen this....

Posted on Dec 08, 2012

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6 Suggested Answers

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: Signal light stays on, no sound output

T14 is part of the +15v power supply that feeds the input board.
It is actually a transistor.
If this is the only problem on the board, then this transistor could be resoldered back on but you will have to make sure it tests OK and it attaches to the heatsink the same way it came off. ie make sure it is electrically isolated from the heatsink
It seems if there is no fuses blown on the power amp board you might be one of the lucky ones.
In my opinion this amp is a clever design but is under-engineered for robustness

Posted on Sep 16, 2008

  • 1 Answer

SOURCE: Mackie SRM-450 tweeter distorts sound

I wish to change access to the diaphragm

Posted on Jun 16, 2010

  • 3 Answers

SOURCE: Mackie srm450 power light out

if its the blue front light you are talking about it is a fiddly but simple fix.
1 phone mackie and order an l.e.d. about £2
2 when it arrives take out the woofer and carefully lay to the side.
3 use a very small philips screwdriver, a tiny bit of blue tack, a mirror and a torch to remove the screw holding the small circuit board with the l.e.d.in place (the blue tack is to put on the tip of the screwdriver to hold the screw and the mirror and torch is so that you can see it)
4 remove the small circuit board and un-solder the l.e.d from it take note of the orientation of the contacts as they only work one way round) and resolder the new one in place.
5 check that it works and re-fit the board and screw ( this can take 2 seconds or 2 hours depending on how lucky you are and how sticky the blue tack is.
6 re-fit the woofer and grill.

the other way is to split the cabinet using the screws on the back and then the repair is obvious from number 4-5

Posted on Feb 22, 2010

mrwtech
  • 59 Answers

SOURCE: SRM 450 Mackie

1)Clean the heat sinks on the amp on the back of the speaker,
2) carefully remove the amp from the rear of the cabinet and look for 'crispy critters' on the circuit board. If you see 'um, either take the amp to a service center, or go to your dealer and get him to order you a new one.
3) if you're goin' thermal, either get higher powered speakers, or tune it back a bit with these. I have a set that has run years in a dance room with no problems. If you are stretching the system to cover a bigger audience, think about another pair.

Posted on Dec 05, 2008

  • 1 Answer

SOURCE: opening mackie 450

with a haxspanner

Posted on Jan 10, 2010

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1)Clean the heat sinks on the amp on the back of the speaker,
2) carefully remove the amp from the rear of the cabinet and look for 'crispy critters' on the circuit board. If you see 'um, either take the amp to a service center, or go to your dealer and get him to order you a new one.
3) if you're goin' thermal, either get higher powered speakers, or tune it back a bit with these. I have a set that has run years in a dance room with no problems. If you are stretching the system to cover a bigger audience, think about another pair.

Oct 04, 2008 | Mackie SRM-450 System

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