Adrian, If you can find no solder bridges, then Yes, replace the regulator.
73, Don W3FPR On 2/13/2021 9:15 PM, KJ7SOY wrote:
Hi everyone! I’m new to the list and to Elecraft radios and HAM in general. Thanks for bearing with me while I learn! I picked up an unassembled K3 at an auction three weeks ago. It’s been sitting in a box with most of the boards sealed in their anti-static bags since 2009. I’ve hit a snag and I’m hoping someone here can help. I have the rev B RF board and I’m doing the manual’s resistance tests. Voltage regulators U12 and U13 are both supposed to test at > 150 ohms. U12 passes but U13 tests at 87 ohms. This unit has never been powered up so I suspect it has to be a bad regulator. I can solder a board just fine and assemble PCB’s but I’m not overly comfortable with hardware debugging. Anyone have any ideas how I should proceed? Do I just replace the regulator? Do some other debugging?
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