I am building a recently purchased K2, serial # 7313. In the past few years I have built 6 or 8 solid state kits, including a K1, without a hitch. However, I am now having a problem that is really making me feel like a "newbie".
I am on page 62 of the manual and things have gone swimmingly until now. All of the resistance checks (RF Board) are fine except for U6 pin 8 which is supposed to read >100 ohms. My reading is 38.3 ohms and I cannot locate the problem. I have searched the Elecraft Reflector and many folks have suffered the same problem. Problem is, I can't find a reference as to how anyone resolved the issue. I have done the following things: 1. Reversed the leads on my DMM. 2. Performed the resistance checks with a second DMM. Same results. 3. Checked polarities on all devices. 4. Spent 2 full days looking for cold or bridged solder joints. 5. I have not "lifted" and checked the resistance of all resistors as I am in the habit of testing them before installing. 6. I have checked the schematics and have given special attention to the soldering and polarity of all "8B" components. (I locate 5 schematic areas fed from U6 Pin 8). 7. I have checked the "Thermistor Board" to the extent I can without removing it. It looks to be OK visually. 8. I have not applied power and looked for heat or smoke but I have been tempted. 9. I have checked for a reversed U8 regulator. I would appreciate any advice that anyone might offer. I would be truly thankful. Would it be helpful for me to know what resistance others show between U6 Pin 8 and each of the 8 pins on the "Thermistor Board"? I'm thinking that might allow me to eliminate that board as a source of the problem but not sure I am thinking correctly. Thanks. 73, Wiley, KG4UPO ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
