nigelcavill Posted January 25, 2010 Share Posted January 25, 2010 Hi guys, Ive got a mackie SRM450 amp module in for repair and I dont know whats wrong with it.Ive plugged the power in and it powers up ok. signal light flashes when I put signal into it.but when I turn up the volume, I get a very low output when gain on the mixer and gain on the amp is maxed out. can anybody point me in the right direction?Ive tried ringing LoudTech, but my call keeps getting binned as soon as someone answers. All help appreciated.Many thanks, Nigel Link to comment Share on other sites More sharing options...
ian hatch Posted January 26, 2010 Share Posted January 26, 2010 Hi guys, Ive got a mackie SRM450 amp module in for repair and I dont know whats wrong with it.Ive plugged the power in and it powers up ok. signal light flashes when I put signal into it.but when I turn up the volume, I get a very low output when gain on the mixer and gain on the amp is maxed out. can anybody point me in the right direction?Ive tried ringing LoudTech, but my call keeps getting binned as soon as someone answers. All help appreciated.Many thanks, NigelHi NigelA OT, but I heard that Mackie are stopping all spares for the Mk1 450's, so any future repairs may be very differcult indeed.A mate needed a power supply for one, normanly £40 item, but the only unit that could be found was in Belguim through the service network and it was alot more than £40, hense the above rumour.Might be linked to your un-answered phone calls?Sorry to be a profit of doom.Ian Link to comment Share on other sites More sharing options...
cedd Posted January 26, 2010 Share Posted January 26, 2010 I'm the owner of a sick SRM350 at the minute - similair fault. Mine had very low output, but when wiggling the gain pot, the level shoe back up again. I managed to get a few spare pots from the service centre in belgium (very helpful and the parts arrived quite quickly). Following replacement (multilayer board - quite tricky!) the fault still remains. I can only assume there's a crack on the little input pcb that the XLR's and gain pots are attached to. I tried to remove the pot completely and replace it with a pair of fixed value resistors (it seemed that the movement of the gain pot was causing the board to be intermittent - as if moving it was disturbing the crack in the board) and for a while all was ok, but now it's dead again. Only thing I can think of is to replace that input board. If you find a part for it, I'd be interested in knowing - I've tried and failed. The alternative I guess is to sit and work out the pinout for the ribbon cable that connects it to the main board. I guess the input board has the mic pre and very little else on it, with the line level output going via the ribbon cable to the main board. It may be possible to connect an XLR directly to this cable, loosing the mic pre facility but at least providing a line input. Chris Link to comment Share on other sites More sharing options...
nigelcavill Posted January 28, 2010 Author Share Posted January 28, 2010 I have some progress on this amp...it now outputs bass, not tryed the top end on it yet.. but I am also getting a high pitched squeal coming thru with the music.. anyone got any ideas?? Link to comment Share on other sites More sharing options...
Eastcoast Posted January 29, 2010 Share Posted January 29, 2010 Hi guys, Ive got a mackie SRM450 amp module in for repair and I dont know whats wrong with it.Ive plugged the power in and it powers up ok. signal light flashes when I put signal into it.but when I turn up the volume, I get a very low output when gain on the mixer and gain on the amp is maxed out. can anybody point me in the right direction?Ive tried ringing LoudTech, but my call keeps getting binned as soon as someone answers. All help appreciated.Many thanks, NigelHi NigelA OT, but I heard that Mackie are stopping all spares for the Mk1 450's, so any future repairs may be very differcult indeed.A mate needed a power supply for one, normanly £40 item, but the only unit that could be found was in Belguim through the service network and it was alot more than £40, hense the above rumour.Might be linked to your un-answered phone calls?Sorry to be a profit of doom.Ian Hmm, that seems odd, they were selling the Mark 1's up until only 2 years ago? :** laughs out loud **: Link to comment Share on other sites More sharing options...
KevinE Posted January 30, 2010 Share Posted January 30, 2010 What did you do to get the bass working? They are of course bi-amped. Link to comment Share on other sites More sharing options...
nigelcavill Posted January 30, 2010 Author Share Posted January 30, 2010 I plugged it in.. plugged driver into it.. put signal into it.. an it started working... but also gave me a very nasty squeal.. only on the bas side of the amp tho Link to comment Share on other sites More sharing options...
TimmyP1955 Posted January 30, 2010 Share Posted January 30, 2010 I'm the owner of a sick SRM350 at the minute - similair fault. Mine had very low output, but when wiggling the gain pot, the level shoe back up again. I managed to get a few spare pots from the service centre in belgium (very helpful and the parts arrived quite quickly). Following replacement (multilayer board - quite tricky!) the fault still remains. I can only assume there's a crack on the little input pcb that the XLR's and gain pots are attached to. I tried to remove the pot completely and replace it with a pair of fixed value resistors (it seemed that the movement of the gain pot was causing the board to be intermittent - as if moving it was disturbing the crack in the board) and for a while all was ok, but now it's dead again. Only thing I can think of is to replace that input board.Chris Just take a sharpened small screwdriver and scrape the coating off of the circuit traces until you find the crack, then bridge the crack with solder (and, if needed, a small piece of wire). Link to comment Share on other sites More sharing options...
KevinE Posted January 31, 2010 Share Posted January 31, 2010 :( scrape the coating off of the circuit traces until you find the crackHave you ever seen inside an srm450? Link to comment Share on other sites More sharing options...
Sound In Gloucestershire Posted January 31, 2010 Share Posted January 31, 2010 I highly doubt that they are stopping spares for the srm450 mk1 my dad is a mackie dealer and bought 12 pairs of srm 450's MK1 less than 6 months ago I think they have to provide support for 6 years if my memory is correct? Link to comment Share on other sites More sharing options...
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