Many months ago, I lost a TBolt when it was connected to a small 'laptop like' power supply. As I recall, this power supply came with the TBolt as part of the Group Buy but I could be wrong. The failure occurred at a time when my workshop was experience very frequent power outages and thus frequent cycling of the 110 VAC.
Yesterday, I had to opportunity to explore it. The only externally noticeable difference between it and a functioning unit is that the 5 VDC current is high at about 410 mA instead of about 220 mA and U22, a Xilinx XC5202 256 cell FPGA, gets quite hot. Functionally, it puts out 10 MHz and the OCXO functions as expected with the +12 VDC current exceeding 550 mA (the limit of my power supply) for a few minutes then settling at about 140 mA. However, there is no ability to communicate via the serial port, it does not discipline (as judged by observing the output frequency vs. a functioning unit) and there is no 1 PPS output. There is + 4.9 VDC on the antenna connector. In spite of being 'dead' it does have some redeeming qualities. It has the Trimble OCXO, the rev. D DS1620, and F.W. = 3.00. Therefore two questions. 1. Is it likely that the FPGA is the culprit or just the victim of another failure? 2. What is the likelihood of repair? Any and all thoughts appreciated. Thanks in advance. Joe _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
