Elecraft K2 Owner's Manual - Manual (Page 154)

2
009 L O B AT T
displayed
 P7 on the control board may be jumpered for
ext. 12V. Move the jumper to the "12V" pos.
 Battery voltage may be below 10.5V.
Recharge the battery as soon as possible.
010 Battery voltage
too low for proper
voltage regulation  If you saw I NF O 0 10 on the LCD, your
battery voltage is too low (< 8.5V). This
usually happens on transmit when your
battery is weak. Disconnect the battery from
the K2 and measure its voltage; if the battery
voltage quickly rises back to 11 or 12V, the
K2 may be loading the battery down. But if
the battery stays stabilizes at under about 10
V when measured outside of the K2, it has
become fully discharged or may be defective.
 If you suspect the K2 is pulling the voltage
down, tap any button to clear the I N F O
message then use D I S P L AY to show the
voltage and current drain. If the current drain
is > 200 mA with no signal and the bargraph
OFF, something is shorting either the 12V
line or one of the regulators (050).
011 No audio, but
display is OK  Make sure that a working antenna is
connected; check audio filter option, antenna
switch, tuner, SWR bridge, etc.
 See Receiver Troubleshooting (100)
012 Display, VFO
knob, switches, or
potentiometers do not
function correctly or
are intermittent  Front panel or control board may not be
plugged in correctly
 Check the MCU (075)
 Check all regulated supply voltages (050)
 RP1 or RP2 on the front panel board may be
installed backwards.
015 Current drain
excessive on receive  Check receive-mode current drain (140)
016 Current drain
excessive on transmit  Connect the K2 to a known 50 ohm load
(preferably a dummy load); if current drain
returns to normal, you probably have a
mismatched antenna and will have to
improve the match or reduce output power
 If you have set the power level control
significantly above the level that the
transmitter is capable of, current may
increase significantly; try reducing the power
setting or use
C A L C U R to set up a
current limit
 Use voltage/current monitor mode to see if
the power supply voltage drops below 11V
on transmit; if so, you may be exceeding the
capability of your power supply or battery
(025)
 If the supply voltage and antenna impedance
are correct, the driver or PA transistors may
not be operating efficiently (150)
018 Supply voltage
drops when K2 is
turned on  Use voltage/current monitor mode to see if
the receive-mode current drain is too high
(015)
 If voltage drops but current drain is normal,
you probably have a power supply problem
or a battery that is not fully charged (025);
review power supply requirements
(Specifications)
019 Supply voltage
drops too low when
transmitter is keyed  Use voltage/current monitor mode to see if
transmit-mode current drain is too high (016)
 If voltage drops but current drain on transmit
is normal, you probably have a weak battery
or inadequate power supply (025)
025 Battery won’t
charge up to the
correct voltage, or
discharges too quickly  Batteries must be charged using the right
voltage or their usable life will be greatly
reduced; if you have the K2 internal battery
option, refer to the charging instructions in
the option manual
 Battery life can be extended by reducing
power output and by turning off selected
features using the menu; see Operation
 Always disable the K2’s internal battery
using the rear-panel battery on-off switch if
you plan to use an external battery or a
reduced-voltage power supply that is
inadequate for charging purposes
029 Small error in
actual vs. displayed
frequency  Make sure your 4.000-MHz oscillator
(control board, X2) is calibrated. Two
methods are provided in the Operation
section (Advanced Operating Features).