How to open a Mackie SRM450

You just take out all the screws from the back and remove it carefully, there you'll find fuse near by the power plug.
Check amperage (I think it is 4Amp fuse) and replace it

Check the aspect of the crossover filter for the speakers, inside. Sometimes they fry.

I need more information, but some similar event i remember with SRM450 and was the paper cone on the speaker, not visible from outside but inside was severely cracked all round, hope this helps.

I'm sure you can get them from Mackie. They have free parts manuals at their site, but I didn't see one for the SRM-450. They do list email and phone technical support. I would drop them a note or give them a call and I'm sure they can take care of your problem:
Their contact info is on this site: http://www.mackie.com/scripts/contact_support.asp
Hope this helps

my mackie srm 450 vz is power supply is dammage

Hi,
yes you can replace part.But you will need to take it to a good technician or take itto the company to avoid more fault.

Take care.

1 TAKE THE MAINS PLUG OUT
2 Unscrew the fixing screws on the back. (just the outside ones)
3 Take the back off and turn the amplifier circuit board to face you.
4 About 2" from the left and about 4" from the bottom you will see a sort of tab. pull it off gently and widen the 2 prongs slightly.
5 Put the jumper tab back on and re fit the amp.

12" phillips screw driver total of 16 or 17 screws on back, then open like a **** its easy!

You probably need to replace the diaphragm. The diaphragm is located behind the back cap. Simply remove the back cap, remove the diaphragm, clean the voice coil gap with a piece of masking tape, install a new replacement diaphragm, reinstall the back cap. That it!
You can see videos on how to replace diaphragm at this link.
http://www.soundspeakerrepair.com/speaker-parts-c/INST/Installation+Instructions
You can buy a new Mackie SRM450 diaphragm at this link.
http://www.soundspeakerrepair.com/speaker-parts-cp/SRM450-DIA/DIA-Mackie/Mackie/

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