[Elecraft] KX1: I Killed My Rig

engineercm clark.macaulay at gmail.com
Mon Feb 2 18:04:07 EST 2015


While doing some rework, a hot lead fell out of my hand and dropped on the
board.  A few segments on the display lit up briefly and then an eerie
silence.  Except for the little map light, nothing works.  I've checked the
DC voltages on the IC's and voltage regulators and the only voltages I can
find out of limit are on U1:

pin 7:    0 and should be 1.4
pin 23: .3 and should be 4.9
pin 25: .5 and should be 5.0 

It would appear that the MCU is blown although I can't quite see how these
pins could keep the display from working.  The hot lead dropped down in the
physical between the 3 blue buttons and the MCU.  I've verified that the
xtal oscillator that drives the MCU is running.  

Before I order a new MCU, are there any other components that I might have
blown due to carelessness that I can check?

72, 

Clark/WU4B



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