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QSC RMX 5050 Failure
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taurusty View Drop Down
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    Posted: 15 January 2013 at 12:01am
See pics attached.
Appears a Channel 2 output stage cap (63V 12000uf) burst & being on the underside pushed the pcb up to the metal divider. Resultant short/fire took out 20 devices
6x 2SA1987
6x 2SC5359
4x IRF 1407
4x MUR 1540
 
Can't seem to locate that last on the island so may have to buy the board w all devices.
Reading up on the net has now revealed myriad cap issues w various RMX models.
 
Ah well, if it comes to the worst can always use it for parts!
 


Edited by taurusty - 15 January 2013 at 12:04am
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luton_soundman View Drop Down
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Points: 4539 		Post Options Post Options   Thanks (0) Thanks(0)   Quote luton_soundman Quote  Post ReplyReply Direct Link To This Post Posted: 15 January 2013 at 1:42am
just out of interest what was the amp playing and driving before it happend?
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levyte357- View Drop Down
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Smoothing caps always need monitoring/regular service on older big iron amps.

Especially CA18/JBL MPX1200.
Global Depopulation - Alive and Killing.
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taurusty View Drop Down
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Luton: 7 5050's. 4 ea with 1 JBL SRX 725F on each channel crossed at 100Hz.
The other 3 ea have an SRX 728S on a channel plaing 40 - 100hz.
This one was on a 725 & took the 2 15's in the box with it when it went. Strangely the horn was unaffected which I attribute to to DC blocking caps in the internal xover.
 
Lev: Frankly don't see what servicing you can give a cap. It either works or not.  If you're lucky to catch it as it starts to bulge, well....
 
Now have a decision to make re the remaining siz: Do I change out 6x24 caps proactively?


Edited by taurusty - 15 January 2013 at 2:11pm
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levyte357- View Drop Down
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Originally posted by taurusty taurusty wrote:

 
Lev: Frankly don't see what servicing you can give a cap. It either works or not.  If you're lucky to catch it as it starts to bulge, well....
 
Now have a decision to make re the remaining siz: Do I change out 6x24 caps proactively?


Basically when you buy the amp, and every few gigs, you pass amp to engineer to service and check smoothing caps, for bulging/leaking.
Global Depopulation - Alive and Killing.
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mattd View Drop Down
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Originally posted by levyte357- levyte357- wrote:

Originally posted by taurusty taurusty wrote:

 
Lev: Frankly don't see what servicing you can give a cap. It either works or not.  If you're lucky to catch it as it starts to bulge, well....
 
Now have a decision to make re the remaining siz: Do I change out 6x24 caps proactively?


Basically when you buy the amp, and every few gigs, you pass amp to engineer to service and check smoothing caps, for bulging/leaking.

Every few gigs? you must be joking! just replace them when they go and have a yearly service surely??
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levyte357- View Drop Down
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Originally posted by mattd mattd wrote:

Originally posted by levyte357- levyte357- wrote:

Originally posted by taurusty taurusty wrote:

 
Lev: Frankly don't see what servicing you can give a cap. It either works or not.  If you're lucky to catch it as it starts to bulge, well....
 
Now have a decision to make re the remaining siz: Do I change out 6x24 caps proactively?


Basically when you buy the amp, and every few gigs, you pass amp to engineer to service and check smoothing caps, for bulging/leaking.

Every few gigs? you must be joking! just replace them when they go and have a yearly service surely??


Might not be convenient for the 500 ppl at gig, if you wait for them to go. LOL
Global Depopulation - Alive and Killing.
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odc04r View Drop Down
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Points: 5482 		Post Options Post Options   Thanks (0) Thanks(0)   Quote odc04r Quote  Post ReplyReply Direct Link To This Post Posted: 15 January 2013 at 11:17pm
Bulging caps are not that much of a problem in reality unless you are using 2 decade old amps or designs with cheap components.

I'd say a service every few years depending on how hard the life of the kit is and how full of dust it gets is perfectly adequate. And I wouldn't expect to have to replace the smoothing caps more than every decade or so.
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Elliot Thompson View Drop Down
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Points: 5176 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Elliot Thompson Quote  Post ReplyReply Direct Link To This Post Posted: 16 January 2013 at 11:29am

Originally posted by taurusty taurusty wrote:


Can't seem to locate that last on the island so may have to buy the board w all devices.


You should contact QSC and order the parts. There may even be an authorised repair centre in Jamaica in which you can purchase the part from. The amplifier may be still under warranty from QSC pending on when you purchased the amplifier.

Best Regards,
Elliot Thompson
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taurusty View Drop Down
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No auth dealer here.
Plus w what I have read about QSC &  Chinese manufacture/components definitely sourcing quality devices elsewhere. I got everything except the MUR devices.
This amp is less than 3 years old BTW...
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APW View Drop Down
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Points: 1174 		Post Options Post Options   Thanks (0) Thanks(0)   Quote APW Quote  Post ReplyReply Direct Link To This Post Posted: 16 January 2013 at 4:34pm
Originally posted by taurusty taurusty wrote:

No auth dealer here.
.
.
.
This amp is less than 3 years old BTW...


You're amp is still under warranty,

The official QSC distributor for Jamaica is: -
AV Technology Panama Corp.
Edificio Met 1 piso 8
Calle 74 San Francisco
Panama City
Bahamas

sales@avtechnologypa.com


Edited by APW - 16 January 2013 at 4:42pm
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Elliot Thompson View Drop Down
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Points: 5176 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Elliot Thompson Quote  Post ReplyReply Direct Link To This Post Posted: 16 January 2013 at 8:07pm
Whether your QSC is made in China or the United States, QSC will honour a valid warranty. So it would be a matter of sending the amplifier to the authorised service centre and your RMX 5050 would be fixed free of charge.

However, if you opened up the amplifier and began unsoldering parts, while the amplifier was still under warranty, chances are, you voided the warranty.

Best Regards,
Elliot Thompson
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