OK. At least I know what's wrong. It appears that one of the chips on the KPA100 fed by the 78L05 has failed and is drawing so much current that the regulator only puts out about 1 volt.
It isn't U1 -- the PIC chip that runs the KPA100. That one is at least socketed and was easy to remove and test with it out of the circuit. And it isn't U3 -- the 78L05 regulator. I pulled it off the board and tested it, it works OK.
It is either U4 -- the MAX1406C chip, or U6 -- the EL5146. My bet is on the EL5146. Now to order parts....
skip to main |
skip to sidebar
Ramblings on Amateur Radio, Flying, Programming, Martial Arts, the Macintosh and Who Knows What.
No comments:
Post a Comment