I take it you've got an iStar/Xeal supply? We had so many failures of those that we've retrofitted over 100 of our ROACH2s!
We even contacted the manufacturer, because their quoted MTBF is simply not believable with the fitted sleeved fans. They offered to replace the failed supplies with the same units and offered no explanation for the early failures en-mass, nor how they obtained their MTBF specification. We now use FSP250-60FAG, and have not had a single failure yet. See Alec's email in the mail archive from 6 July 2016. Jason On 08 May 2017, at 18:31, G Jones <glenn.calt...@gmail.com> wrote: > Hi, > To follow up on this, I confirmed that the power supply had indeed failed. > The fan was completely seized up. I also checked C163 out of an abundance of > caution (thanks, Jason, for the notes!) and it seemed fine. Replacing the > power supply brought he ROACH2 back to life. > > Thanks, > Glenn > > On Mon, May 8, 2017 at 8:33 AM, Jason Ray <j...@nrao.edu> wrote: > Hi Glenn, > > A while back, I repaired a roach2 problem that had similar symptoms. Its > probably not terribly likely that yours has the same problem, but I thought > I'd share in case... > > The short story is that a capacitor (C163) failed and I could measure > ~220ohms across it. This particular cap is part of the soft reset circuitry > associated with switch S1, and was pulling down the signal, holding the > roach2 in reset. > > I removed that capacitor and saw pretty major evidence of re-work in that > area (missing pads & traces, small wires from nearby vias, etc). We never > use the soft reset switch on the board, so I just removed all of those parts > and the roach2 board now functions as it should. > > Good luck! > Jason > > > > > On 5/5/2017 4:45 PM, G Jones wrote: >> Hi, >> Our ROACH2 suddenly failed recently. The symptom is that it won't power on. >> The green AUX power LED is on and the red FAULT LED is on. Pressing the >> power button and the reset button does nothing. >> >> Looking back at the archives, I see that the standard ROACH2 power supply is >> known to fail after overheating. Is this a symptom of that failure? I will >> try another power supply shortly, but I'm curious if others have seen this >> symptom before. >> >> Thanks, >> Glenn >> -- >> You received this message because you are subscribed to the Google Groups >> "casper@lists.berkeley.edu" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to casper+unsubscr...@lists.berkeley.edu. >> To post to this group, send email to casper@lists.berkeley.edu. > > > -- > You received this message because you are subscribed to the Google Groups > "casper@lists.berkeley.edu" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to casper+unsubscr...@lists.berkeley.edu. > To post to this group, send email to casper@lists.berkeley.edu. > > > -- > You received this message because you are subscribed to the Google Groups > "casper@lists.berkeley.edu" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to casper+unsubscr...@lists.berkeley.edu. > To post to this group, send email to casper@lists.berkeley.edu. -- You received this message because you are subscribed to the Google Groups "casper@lists.berkeley.edu" group. To unsubscribe from this group and stop receiving emails from it, send an email to casper+unsubscr...@lists.berkeley.edu. To post to this group, send email to casper@lists.berkeley.edu.
