Mackie SRM450v2 schematic? - diyAudio
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Old 17th April 2011, 03:34 AM   #1
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Default Mackie SRM450v2 schematic?

I got a burnt Mackie SRM450v2. It burnt in the SMPS section, around UC3842, LM339. Many tracks and PCB and SMD components are inrecognizeable.

The unit use switching power supply, a classD for woofer amp, andLM3886 for tweeter amp. Different from old SRM450

Anyone has schematic or service manual for this active speaker?
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Old 17th April 2011, 09:23 AM   #2
authlxl is offline authlxl  China
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Maybe circuit like JBL EON series ,if possible,paste more pics here
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Old 17th April 2011, 04:46 PM   #3
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Here's some more pictures
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File Type: jpg IMG-20110417-00165.jpg (332.4 KB, 1080 views)
File Type: jpg IMG-20110417-00166.jpg (319.8 KB, 1026 views)
File Type: jpg IMG-20110417-00168.jpg (333.2 KB, 932 views)
File Type: jpg IMG-20110417-00169.jpg (372.6 KB, 388 views)
File Type: jpg IMG-20110417-00173.jpg (362.6 KB, 397 views)
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Old 17th April 2011, 08:30 PM   #4
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It looks like only the boost pfc preregulator got burnt, the main half bridge looks alive.
why don't you first try to bypass the pfc and run the half bridge only?
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Old 18th April 2011, 03:33 AM   #5
authlxl is offline authlxl  China
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On our concept in,Mackie almost good quality,we have redraw it SRM350 series amp years ago,bass use class H and tweeter use CLASS AB chip.in new version srm450v2,same not good as our idea.

most of it circuit have shown in it user manual and website introduction,you can find it below:

Mackie - SRM450v2

user manual

http://www.mackie.com/products/srm45...rm450v2_om.pdf

Block digram paste here:
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Old 18th April 2011, 06:06 AM   #6
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Hi, Darkfenriz,

It seems this UC3842 is used for PFC, but also for regulating the output stage. The push-pull transformer is using SG3525, but the pulse is 50%, so the output of PFC is regulating the output voltage of the smps.
The woofer is using IRF classD driver with +/-75V, and LM3886 for tweeter is working at +/-39V.

Now the PFC won't work at all. Always blown the UC3842 and the PFC mosfet. Many SMD components like SOT23 transistor and resistors are burnt.

I think there is very difficult to fix this amp without schematic or service manual
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Old 19th April 2011, 04:47 PM   #7
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Are you sure that it is UC3842? Was the old IC recognizable? Recent 8-pin continuous mode PFC controller ICs are becoming more and more common (IR1150), even with a second PWM output in them (FAN480x).

If you can't find a schematic, draw your own. First the PFC, then the push pull and input rectifier, leaving "?" boxes for unrecognizable parts. Don't be lazy, the SMPS layout does not look that difficult.
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Old 19th April 2011, 05:38 PM   #8
fcruz is offline fcruz  Brazil
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and what your email so I can send the schema srm450v2
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Old 11th June 2011, 09:19 AM   #9
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email: email address removed - I want to get the scheme srm450v2 with pulsed power supply.
Thanks friend!

Last edited by wintermute; 15th July 2011 at 10:28 AM. Reason: email address removed
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Old 21st June 2011, 02:30 AM   #10
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Default same problem with srm450v2

hello! i have same problem with SRM450V2

it's burned a lot of comps.
it's possible to have the schematics?

my email is email address removed , Thanks a lot!

Last edited by wintermute; 15th July 2011 at 10:27 AM. Reason: email address removed
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