Hi Bill, I think you've got a genuine hardware problem rather than being transported into an unknown menu setting. Does the MENU button work at all?
Can you change the frequency display by rotating the main tuning knob? The K2 uses a parallel switch status polling process to determine the switch states. There are two banks of 8 switches, and the states of each switch in a bank are read simultaneously. I haven't measured the polling rate, but it's sufficiently fast to distinguish between a momentary PRESS and the longer HOLD actions specified in the operator manual. The MODE button is part of the BANK1 group. If it's the only working button in that group, you have a problem with the parallel load shift register U2 on the Front Panel board either not loading correctly or not sending out the correct register contents serially to the MCU on the Control board. >From your description it appears that none of the BANK2 switches are read at all. It is unlikely that the individual switches have all failed. It is probably worth inspecting the switch solder joints and related traces on the Front Panel board to be sure that the switches can be read. While it's also unlikely that contact corrosion on the connectors that join the Control board and Front Panel board to the RF board would account for the loss of selected switches, it wouldn't hurt to pull those boards and carefully reinsert them before delving too deeply into replacing parts. It's not difficult to separate the pieces that make up the K2 Front Panel and Control board assembly. Check the online manual for details. It involves opening the top cover, removing 2 screws that hold the Control board to the Front Panel board, then removing screws that secure the Front Panel assembly to the rest of the radio. The Front Panel board is pulled forward horizontally at the connector to the RF board to separate it. If the issue seems beyond your comfort level to address, you should reach out to Dave, W8FGU, who is the legacy (K1, K2) radio repair guru for Elecraft. Dave does excellent work at a fair price and knows the K2 inside and out. His web page is https://w8fgu.com/ 73, Mike, K8CN ______________________________________________________________ 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
