In case anyone is interested, or someone has the same issue and 'Googles; this in the future, I traced the problem to a faulty crystal on the main DSP board. It's hard to work on the DSP board in the radio, but with it removed and just the 5V rail powered, there was no clock on the board. All the control pins on the TMS320 DSP chip looked at the correct state to have the internal oscillator running and the reset pin was being correctly polled at startup via the power management IC U21 and the FPGA (U17). All connections to the crystal and associated discrete components looked OK - so it looked like a duff crystal (easy) - or a duff DSP chip (hard!). I'd ordered a crystal on the off-chance that was it - but I thought about swapping the crystal off the DSP2 board. I got as far as getting ready to remove the old one and thought to check again after I'd disturbed the connections. On power up the board took 180mA at 5V rather than the 40mA or so it had been taking previously and showed signs of life. But - as the crystal cooled down - it all stopped again - so definitely looked like a broken crystal.
New crystal arrived today - and all is good. 73 Andy, G4PIQ From: g4...@btinternet.com <g4...@btinternet.com> Sent: 05 April 2024 13:54 To: 'elecraft@mailman.qth.net' <elecraft@mailman.qth.net> Subject: E000202 error with DS1, DS4, DSE and DVR Hi Folks, We had one of our many K3s at M6T fail over the weekend of the WPX SSB contest. It was quietly minding its own business as 2nd radio on 80m (not getting any use!) and at some point it started displaying the E000202 error along with DSE - then as you cycle through DS1, DS4 and DVR. So - it seems that we've lost communication with both DSPs and the DVK. All those are mounted together of course. I've tried re-loading the firmware - but the utility fails to upload to DSP1, DSP2 and DVK and can't see any version installed on any of these options. The radio is an old serial number (#729) - but it had had many mods done to it - including the gold finish connectors. There is no sign that the failure is intermittent - plugging and unplugging make no difference and I've done a bunch of connector cleaning. The rest of the radio appears to be operating - push buttons and bands change etc. - but a bit slowly - as if the comms bus or CPU is busy. Through board swapping with another K3, I've isolated the problem to the main DSP board. I've checked the +8, +5, +3.3 and +1.8V rails on the board and these seem OK, but I haven't got the scope out yet. Just checking to see if anyone else has suffered this same sort of mix of faults and found the source. 73 Andy, G4PIQ ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to arch...@mail-archive.com
