On Thursday 13 November 2008 09:12:37 Matt Ettus wrote: > Berndt Josef Wulf wrote: > > G'day, > > > > I haven't made any progress in finding a solution to my problem. A direct > > email to Matt (Ettus) explaining my predicament didn't receive a reply. > > It was hoped that the manufacturer of the USRP would provide some after > > sale techmical support for their products. > > Berndt, > > I am sorry to have not gotten back to you, but I get over 300 non-spam > emails per day, many with technical questions, and it can be hard to > wade through them. I try to go through the backlog at least once a week. > > > The USRP is no longer communicating when it was powered up after being in > > storage for the past 6 month. As mentioned in my previous email, see > > below, my suspect is the co-processor that hosts the USB interface, > > although I can't be sure. Perhaps someone on this list knows a procedure > > that would lead to an accurate diagnosis. > > It sounds like the transceiver circuitry on the FX2 has gone bad, but > the processor is still running. This the most common failure mechanism > we see. We have static protection diodes on the recent boards, but it > does not seem to change things. The best course of action is to replace > the FX2 chip. We do not see this failure often, but when it does, it is > often when used with cheap aftermarket power supplies for the laptop, or > with a nonstandard USRP power supply. > > > At this stage I'm contemplating to replace the processor. What needs to > > be considered prior to replacing this processor, e.g. does it need to be > > flashed? I'm also looking for a supplier for this chip. > > They do not need to be flashed. You should be able to get the chip from > Digikey or any other Cypress dealer. The exact part number is > CY7C68013A-100AC. They are about $15 in small quantities. > > Matt
G'day Matt, many thanks for your reply. You're confirming my suspicions and I'm now confident in tackling this problem head0on by replacing the FX2. Hope to be back on-the-air with USRP and GNU-Radio soon. 73, Berndt VK5ABN _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
