Switched Mode Power Supplies (SMPS)

[Frosteh]

Originally Posted by Cristi

In 90% of the cases, the fuse is the last one who blows, it;s purpose is not as much to protect the smps, but as much to protect the rest of the mains circuit against the effect of a short circuit.
you can replace the fuse, then have another try. i suggest to use an incandescent light bulb instead of fuse, if the smps is damaged, the bulb will lit continuously, if not, just during turn on. if is fine, replace the fuse with a similar one, 8-10A at 250V. do not make improvisations, like wires soldered over the fuse or pcb.

Ok. I'll try the lightbulb in the morning. Are there any other tests I can run to see if the SMPS is damaged? By the looks of it, the rest of the components are fine. I don't see any blown resistors or capacitors since there are no burn marks or discolorations on any of the other parts.

[Cristi]

check the rectifier bridge, and the power mos-fet's D-S pins with a multimeter to see if they are not shorted.

[Frosteh]

Which pins are the D-S pins on the MOSFET? I'm afraid I'm not very familiar with MOSFETS. Is the power MOSFET "U1" or "U2" in your schematic?

[Frosteh]

I just did the lightbulb test and it lit continuously. This means the SMPS is broken, correct?What do I need to do to fix it? I'm quite experienced with soldering and pcb layouts and can order replacement parts in the USA, which will be much faster and less expensive than shipping to China and back.

[Cristi]

I still believe that is safer and better to send back to repair, but if you are sure that you can repair yourself, check the rectifier bridge first, then the MOS-FET's. probably the MOS-FET's failed only and must be replaced. mail me to send you instructions to repair.

[Lo_Tse]

Hi, Cristi,

Just sent you an enquiry via a PM. Looking forward to hear from you.

Lo_tse

[neilmc]

Sorry if I've missed this (tried a few searches here and looked around on the Connexelectronic site).

Can anyone tell me the dimensions of the SMPS2000R power supply and the dimensions of the IRS2092 Modular Amplifier?

[alkasar]

Originally Posted by neilmc

Sorry if I've missed this (tried a few searches here and looked around on the Connexelectronic site).

Can anyone tell me the dimensions of the SMPS2000R power supply and the dimensions of the IRS2092 Modular Amplifier?

for 2000R look at page 42 of this thread

[neilmc]

Originally Posted by alkasar

for 2000R look at page 42 of this thread

Thanks alkasar! It can't be much clearer than that.
After using search I started scanning through thread posts from the beginning. Of course I should have started from the end and worked back......

[khjen]

Hi Cristi

I just received a SMPS500R +/- 50v power supply from connexelectronic and found that the two smoothing caps (6800uf) were rated for 50v. Shouldn't these caps have some margin for overvoltage?