I'd do my troubleshooting with an ohmmeter FIRST..... 73 de alex NS6Y
On Jul 23, 2006, at 4:58 PM, Rick Tavan N6XI wrote:
Hi, guys. I smoked my K1 by plugging in the wrong DC cable. It came
from a
35V supply instead of 12V. The radio worked for about 15 seconds,
then died
with an odor of burning components; no visible smoke. Realizing
what I had
done, I connected it to 12V to troubleshoot. I see only 1Hz pops of
(low)
voltage on the 12V line using an analog meter. I hear a weak 1 Hz
click from
the speaker, see nothing on the display. I removed all daughter
boards. I
see no visibly burned components. I removed and checked C35 and it
still
acts like a capacitor. I measured 4 ohms on the 12V line which
seemed low to
me. I removed U5 and saw the same 4 ohms. I reinstalled C35 and U5
(although
I suppose U5 could be the victim/culprit itself) and, per the
troubleshooting suggestions in the manual, measured 5.5K on the 8V
line and
670 ohms on the 6V line. RF-Q7 tab measures 3.5 ohms to ground. No
idea
what these resistances should be. Should I just replace U5? Look
elsewhere?
Any suggestions would be appreciated.
Thanks & 73,
/Rick N6XI
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