Electronics > Repair

Good PSU repair shop in the UK?

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Wuerstchenhund:
Hi All!

I have a switch-mode power supply (Artesyn/Computer Products XL130-3630E) that needs repair as one of the voltage rails produces a too low outout (0.7v-1.7v instead of the 3.5. expected; all other voltages are fine). All caps have been replaced already, as have shunts and most transistors. There is no obvious fault (i.e. burn damage on components), and all the minor parts like diodes and resistors haven't been checked, so the problem could easily be something simple.

The thing is that switch-mode PSUs are not my strongest point (and this PSU is quite complex) and that due to other, more pressing stuff I simply also don't have the time to search for the fault myself. In addition, my home lab is still sparsely equipped with spare components which doesn't help either.

I don't have the schematics as Emerson Embedded Power (who now owns Artesyn) won't give out schematics to this 19 year old PSU because of 'IP protectsion' (it's not as if the schematics couldn't be derived from the PSU itself, given enough time, but here we go).

So I am now looking for a shop in the UK (or if there's none I would also take one in another EU country) that can fix such a PSU for a reasonable amount of money. Google found me a few shops but they are working with businesses only and generally charge in excess of £200 for repairs.

So I was hoping that someone might know a shop in the UK who can fix a somewhat complex switch-mode PSU for a reasonable price.

Rerouter:
the price you have been seeing sounds about right on the money, when you consider the hours labor required to troubleshoot and repair a circuit they have likely never seen before, nor one that a schematic can be sourced for, in fact in aus it may be considered cheap,

darrylp:
If you don't feel upto fixing it yourself. Then why not add circuit to give you a new -3.5 output.
Not much more than a lm337 and a few caps and resistor will get you the voltage you need. Surely that sat on a stripboard will fit inside ?

Darryl

Wuerstchenhund:

--- Quote from: Rerouter on February 21, 2013, 10:28:12 am ---the price you have been seeing sounds about right on the money, when you consider the hours labor required to troubleshoot and repair a circuit they have likely never seen before, nor one that a schematic can be sourced for, in fact in aus it may be considered cheap,

--- End quote ---

Well, maybe, but then I would assume that a shop that specializes on fixing PSUs should have seen most of the ways a PSU can be designed, and the fact that certain components have been replaced should at least in theory limit the components that need to be checked to find the fault.

I would think for someone with experience in power electronics and who has access to the right tools and spare parts it probably won't take much time to find out what's wrong.

Wuerstchenhund:

--- Quote from: darrylp on February 21, 2013, 11:39:37 am ---If you don't feel upto fixing it yourself. Then why not add circuit to give you a new -3.5 output.
Not much more than a lm337 and a few caps and resistor will get you the voltage you need. Surely that sat on a stripboard will fit inside ?
--- End quote ---

I thought about that but there are various reasons why I this is no alternative, and one of them is space.

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