Behringer ufx1604 mixer repair (smpsu11)
Hello all.
My first proper post to badcaps forum so just wanted to say a big thank you for all the information I've learned already from lurking and reading old threads.
Signing up to the forum took a little longer than I'd expect so I've now fixed the initial problem I was having (and introduced a new one) but thought it would be good to document here and see if anyone has any ideas on the new problem.
The initial problem was that when the mixer was turned on from cold, there would be a ticking from the power supply area and the mixer would continually restart.
After removing power the power supply would continue to tick for another 30 seconds or so and then you could try again.
I'd normally be able to get it on after 5 or 6 tries and tbh (naughty I know), once it was on I'd often just leave it on if I was going to be using it for consecutive days.
This has gone on way longer than I'd like to admit now so decided to crack her open over the weekend and have a look at the power supply.
It's a behringer smpsu11 power supply based around a NPC 200D6 IC.
On visual inspection all electrolytics are 105' Decon's. (a brand I see gets no love on here)
I first noticed a capacitor next to the transformer with obvious bulging at the top so that was my obvious first candidates.
It was a Decon 63v 220uf shl which I replaced with a Panasonic EB 63v 220uf.
While changing the cap I noticed a 2nd capacitor nearby also bulging and decided to replace all the electrolytics as a precautionary measure.
I'd been reading some threads on here with people suggesting to use Panasonic FC in smps as they have a lower ESR than the EB's.
Going on that I purchased FC replacements of the same voltage and capacitance for all the caps on the low voltage side.
After removing all the Decon caps and testing them this is the result.
V uf model ESR % out of spec
35v 47uf sh - 15.85uf .14k 66.27%
35v 47uf sh - 15.16uf .14k 67.74%
25v 220uf slz - 177.2uf .43ohm 19.45%
25v 220uf slz - 192.9uf .13ohn 12.31%
63v 100uf sh - 88.90uf .56ohm 11.1%
63v 100uf sh - damaged part (domed)
63v 220uf shl - damaged part (domed)
25v 1000uf shl - 909.5uf .00ohm 9.05%
25v 1000uf shl - 905.0uf .00ohm 9.5%
63v 100uf sh - damaged part (nothing visible)
The mixer now turns on first time but I've noticed lots of noise coming out of channel 7 even with the gain turned right down. Sort of squelchy static that comes and goes at random.
On the off chance that the Panasonic EB is causing the issue I'm going to change that out this morning and report back.
Not sure how to get the attached photos in to here to label them but there are before and after shots and shots of the domed caps.
My first proper post to badcaps forum so just wanted to say a big thank you for all the information I've learned already from lurking and reading old threads.
Signing up to the forum took a little longer than I'd expect so I've now fixed the initial problem I was having (and introduced a new one) but thought it would be good to document here and see if anyone has any ideas on the new problem.
The initial problem was that when the mixer was turned on from cold, there would be a ticking from the power supply area and the mixer would continually restart.
After removing power the power supply would continue to tick for another 30 seconds or so and then you could try again.
I'd normally be able to get it on after 5 or 6 tries and tbh (naughty I know), once it was on I'd often just leave it on if I was going to be using it for consecutive days.
This has gone on way longer than I'd like to admit now so decided to crack her open over the weekend and have a look at the power supply.
It's a behringer smpsu11 power supply based around a NPC 200D6 IC.
On visual inspection all electrolytics are 105' Decon's. (a brand I see gets no love on here)
I first noticed a capacitor next to the transformer with obvious bulging at the top so that was my obvious first candidates.
It was a Decon 63v 220uf shl which I replaced with a Panasonic EB 63v 220uf.
While changing the cap I noticed a 2nd capacitor nearby also bulging and decided to replace all the electrolytics as a precautionary measure.
I'd been reading some threads on here with people suggesting to use Panasonic FC in smps as they have a lower ESR than the EB's.
Going on that I purchased FC replacements of the same voltage and capacitance for all the caps on the low voltage side.
After removing all the Decon caps and testing them this is the result.
V uf model ESR % out of spec
35v 47uf sh - 15.85uf .14k 66.27%
35v 47uf sh - 15.16uf .14k 67.74%
25v 220uf slz - 177.2uf .43ohm 19.45%
25v 220uf slz - 192.9uf .13ohn 12.31%
63v 100uf sh - 88.90uf .56ohm 11.1%
63v 100uf sh - damaged part (domed)
63v 220uf shl - damaged part (domed)
25v 1000uf shl - 909.5uf .00ohm 9.05%
25v 1000uf shl - 905.0uf .00ohm 9.5%
63v 100uf sh - damaged part (nothing visible)
The mixer now turns on first time but I've noticed lots of noise coming out of channel 7 even with the gain turned right down. Sort of squelchy static that comes and goes at random.
On the off chance that the Panasonic EB is causing the issue I'm going to change that out this morning and report back.
Not sure how to get the attached photos in to here to label them but there are before and after shots and shots of the domed caps.
Attached Files
Comment