On Oct 1, 2006, at 10:34 AM, Ron D'Eau Claire wrote:
Tod, look for a short in the +12 circuit to ground. The swollen
batteries
suggests they were feeding lots of current into a dead short for a
long
time.
Open the unit and do the resistance checks at the top right column
on page
54 of your manual. If those checks disclose a short, follow the PCB
traces
back to the power switch. You may find that one carrying +12 has
burned open
from the heat of the batteries.
All checked out OK
I just completed the voltage checks on page 27 of the assembly manual
Here's a comparison of the results when working versus now
U1 pin 1 was 4.94v now 19.5mV
U3 pin 6 was 6.05v now 2.47v
D2 Anode was 14.83v now 2.7v
D2 cathode was 13.75v now 2.5v
Voltage measured at the supply is 12.3v (Astron AS-35)
Tod
----
Tod Glenn
N7WD
NAQCC #1283
SKCC #1444
FISTS #12134
ARCI #12420
[EMAIL PROTECTED]
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