1 Topic by PhilippeMustang (edited by PhilippeMustang 2018-08-04 08:45:18)

  • Registered: 2011-08-17
  • Posts: 75

Topic: UFX Power Supply out of service :o(

Hello,

When I started my UFX yesterday, I heard a ‘boum’ inside and it did not switch on any longer.

I opened it (warranty passed long ago), and inspected the inside that looks nice.
On the cover top ground connector, there is a ‘brownish burned’ color at the solder level...
The On/Off switch is still Ok.

The PSU fuse is still Ok and 235v is still measured at its output, but nothing comes from the 6 DC cable connectors.

So I guess the PSU (it is referenced ‘On-tek OT-040F’) is fried between the 235V mains and the DC outputs.

I would like to know if you sell this PSU as a spare part, of if I need to change all PSU capacitors one by one ?

Thanks for your advice,
Philippe

  • Registered: 2011-08-17
  • Posts: 75

Re: UFX Power Supply out of service :o(

... Forget my previous message !

As my UFX was out of warranty (7 years of very moderate use), I decided to remove the Power Supply card and Check it.

I found that a little black coil was burned (not the fuse though !).
With the help of a GearSlutz thread where a poster did list all capacitors characteristics, I did buy the capacitors of the board + a coil for 10,90€.

After de-soldering around 10 components and re-soldering the new ones, the UFX did start up for a new life.

I’m a happy man, yes I am (copyrights Bobby Mc Ferrin)

Cheers,
Philippe

3 Reply by MC

  • MC
  • MC
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  • From: Germany/Thailand
  • Registered: 2007-04-06
  • Posts: 24,851

Re: UFX Power Supply out of service :o(

The solder dudes will thank you even more by posting the link of that Gearslutz post...

Regards
Matthias Carstens
RME

MC's Website

4 Reply by PhilippeMustang (edited by PhilippeMustang 2018-08-15 16:35:39)

  • Registered: 2011-08-17
  • Posts: 75

Re: UFX Power Supply out of service :o(

Hello Matthias,
The Gearslutz post I was refering to is the following :

https://www.gearslutz.com/board/so-much … ilure.html

It refers to the RME Fireface 800 but I learned it is exactly the same power supply for the UFX...

I am not really a "solder dude" but for a beginner to intermediate solder soldier, it is doable ! And the only risk, is to destroy the power supply ... that didn't work already.

Philippe

5 Reply by PhilippeMustang (edited by PhilippeMustang 2018-08-16 07:36:43)

  • Registered: 2011-08-17
  • Posts: 75

Re: UFX Power Supply out of service :o(

The list of capacitors that are changed and their equivalents are the following :

68 uF, 400V, 24mm, snap-in connector type == 1x, 400MXC68MMN22X25, snap-in 68 uF 400VDC
2.2 uF, 50V, 5mm == 1x, ECA1HHG2R2, 2.2 uF 50VDC
22 uF, 63V, 6mm == 1x, 63PX22MT15X11, 22 uF 63VDC
100 uF, 16V, 6mm == 1x, 16ZLH100M5X11, 100 uF 16VDC
47 uF, 50V, 6mm == 1x, 50PX47MT16.3X11, 47 uF 50VDC
4x 470 uF, 35V, 10mm == 4x, EEUFR1V471, 470 uF 35VDC
2x 2200 uF, 16V, 10mm == 2x, 16PX2200MT810X20, 2200 uF 16VDC
2x 100uF, 63V, 10mm == 2x, ECA1JHG101, 100 uF 63VDC

+ check integrity or ´continuity’ of the fuse and of the 2 cylindrical back coils.

Took the above list and the Power Supply Unit board (that is easily detachable from the UFX) to an electronic store, and it only costed me 10,90€. Be sure to check the capacitors you buy will handle temperatures of 105°C, it is written on it (there are capacitors under 85°C but they won’t last).

If you work slowly (like me), it will take you one hour of soldering.

But it is worth it !!

When de-soldering / resoldering the capacitors one by one (that’s what is called ‘recap’ on fora), beware the polarity (there is a white semi-circular mark on the board for the minus pole, and the ‘-‘ is printed on the capacitor, so there should be no reason for mistakes here). The ‘minus’ leg of the new capacitors is generally shorter than the +.

‘They tried to make me go to recap... I said yeah yeah yeah...’
Philippe