Don, Where is my more complete reply:
The problem appears to be related to something loose aroud the MCU chip on the Control Board. If I put a lot of pressure on the top of the MCU chip, the ELECrAFTt message progresses to the frequency readout. This is with the Control Panel fully mounted and the KAF2 board installed. The connector cable to the KAT2 and KIO2 are disconnected for now. There are still some strange things, but at least the unit responds to front panel input. The pressure I refer to is with my fingers pressing down vertically. Remember the Control Board is installed vertically. The pressure is along the top row of pins. I also can use the foam handle of a pair of pliers, in case any electrical connection is made from my fingers touching the MCU chip. So far I've remove the MCU chip, with my wrist grounded, and touched up all of the solder connections on the socket. I also touched up all of the solder connections on the pins on that connect to the RF board. Again my K2 is serial number 2289. It has the mods from the document titled: "UPGRADING THE ELECRAFT K2 TO REVISION B". Also has mods from documents titled "ELECRAFT K2 REVISION 2 FIRMWARE" and "Elecraft K2 Keying Modifications Instructions". Those documents are with the paper included with this K2. 73, Steve N6VL -----Original Message----- From: Don Wilhelm [mailto:[EMAIL PROTECTED] Sent: Friday, July 27, 2007 11:00 AM To: Steve Kallal Cc: [email protected] Subject: Re: [Elecraft] Second call: K2 broken after KPA100 mod Steve, There is no direct relationship between your symptoms and what you intended to accomplish. So this is something that inadvertently happened along the way. The first thing to do is inspect the control board visually - in most cases an unsoldered or poorly soldered connection is to blame for behavior like that. Move things around a bit to see if you can make it change from working to not working. Also check the soldering of the connectors at the front of the RF Board - they provide a path between the front panel and the control board. Be certain the microprocessor (Control Board U6) is properly seated in its socket and no pins are bent under the chip (you may have to remove it to check for bent under pins - use good anti-static measures if you remove it). If the problem does not reveal itself visually, the next step is to do DC voltage measurements on the control board and possibly the Front Panel board. Compare to the DC Voltage chart in the back of the manual. Since you purchased a used K2, the level may be important - please let us know the serial number and state of updating that it may have had. I am sorry I cannot provide a more concrete answer, but it does have nothing to do with the KPA100 installation at the point where you are now. 73, Don W3FPR _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
