[Elecraft] K2/10 low battery message

[Don Wilhelm]

Scott,

The K2 does not really know whether the power being supplied to it is 
from a battery or not - so read that indication as "Power voltage is low".

One of 2 (maybe 3) situations exist with your K2.
1) the power supply voltage seen by your K2 is really too low.  Measure 
the voltage at the cathode of D12 with your DMM during transmit (TUNE is 
OK) at full power output into a dummy load.  If the voltage drops 
substantially, then be certain your power cord has adequate current 
carrying capacity and that your power supply is not dropping the voltage 
under load (measure during transmit directly at the power supply terminals).
2) The jumper at Control Board P7 is either missing or is plugged onto 
the EXT pins.  If you have an older K2 (serial less than 3000), you have 
a switch rather than a jumper and its position may get bumped to the EXT 
position easily (I have seen one switch that had failed on the INT side).
3) If all the above are checked out and found to be OK, you may have a 
problem with Control Board U3B, R9 or R10.  You should be able to check 
these for proper operation by tapping the DISPLAY button and seeing what 
voltage is indicated on the LCD.  If it is 0.3 volts less than the input 
voltage, then these circuits are working OK.

73,
Don W3FPR


Scott McDowell wrote:
> Hello
> Has anyone ever had their low battery mesage
> keep coming on every five minutes on their  k2/10.
> Where does this message originate from?
> I have re-soldered every joint from the power
> input up to the power switch and can't figure out
>  where the power circuit goes from there.
>  All components check good up to that point.
> I even re-soldered the power switch. Anyone ever
> have a bad power switch? The low battery
> messages never comes on during transmit.
> I have the K2/10 connected to the same 30 amp
> power supply that I used on my K2/100, and
> I never had a low battery message on it.
> I don't have a battery installed so that is not
> the problem.
> I never got this message on my K2/100 running
> 100 watts, so I believe the problem is in the K2.
> Any one know where to start looking?
> 73
> Scott N5SM
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