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Mackie SRM450, signal and peak led on, no output. Fixed.

 
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lalunatech



Joined: 24 Jan 2013
Posts: 4

PostPosted: Mon Feb 18, 2013 1:32 pm    Post subject: Mackie SRM450, signal and peak led on, no output. Fixed. Reply with quote

Hiya
Just repaired a Mackie SRM450 with thermal and signal indicators always on. R282 and R283 10 Ohms 0.5 Watt metal oxide resistors were open circuit. I replaced them and powered up with a Variac while checking Voltage drop across them did not stray too high, should be around 1 Volt. It's a fix.
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billoni



Joined: 06 Jun 2014
Posts: 1

PostPosted: Fri Jun 06, 2014 4:35 pm    Post subject: Reply with quote

Hi,
I also have the Mackie SRM 450 and am trying to replace the R282 and R283 10 Ohm resistors. I'm trying to do a DIY repair on the unit, but I'm having a problem locating exactly where the resistors are. Could you point me in the right direction?
Many thanks in advance!
Pete
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jts1957



Joined: 24 Nov 2008
Posts: 2472
Location: Far, Far Away

PostPosted: Fri Jun 06, 2014 5:23 pm    Post subject: Reply with quote

http://elektrotanya.com/?q=showresult&what=Mackie%20SRM450&kategoria=&kat2=all
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PostPosted: Fri Jun 06, 2014 9:00 pm    Post subject: Thanks Reply with quote

Hi,
Thanks for that info. I searched through the service manual, and there was no listing for those 2 parts in the part listing. I have the original 450, maybe I'm looking at the wrong manual? Thanks again for your help! Pete
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lalunatech



Joined: 24 Jan 2013
Posts: 4

PostPosted: Sun Jun 08, 2014 10:45 am    Post subject: Reply with quote

I just had a good look through the schematic I have and I cannot find R182,R183 either. Drawing number 990-227-00 Rev C. The version I repaired must have been different. I don't remember where they were on the board, it was a while ago. Sorry I can't be more help.
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PostPosted: Wed Jun 11, 2014 11:21 pm    Post subject: Reply with quote

Cool, thanks for the help, I thought I was going crazy. Could not find it. I guess I'll have to bring in in for servicing.
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