Elecraft KPA100 Manual - Manual (Page 26)

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Tap
D I S P L AY
to check the K2 power supply voltage (E) and
current (i). If the voltage is lower than expected, or the current is over
0 . 5 0
amps, refer to Troubleshooting (page 64 of this appendix). Note:
Installing the KPA100 increases K2 receive-mode current drain by
approximately 100-200 mA. In transmit mode, additional current is
drawn, but this will not be included in the voltage/current display.
Tap
D I S P L AY
until the frequency display returns.
Set your DMM for DC volts, 20 or 30 V full scale (or auto ranging).
Connect the DMM's (-) probe to the ground jumper on the KPA100 board
(near U1). Using the DMM's (+) probe, make the voltage measurements
listed below. Voltages should be within +/- 10% except as noted.
i
When making measurements at IC pins, be careful not to
short adjacent pins. Use only a fine-tip DMM probe. Do not attempt
to make measurements using a wire or a probe with a large, blunt tip.
KPA100 Test Point (+) Voltage
U1 pin 1 5.0
U1 pin 7 0 to 0.1
U1 pin 13 0 to 0.1
U1 pin 14 0 to 0.1
U1 pin 15 0 to 0.1
U1 pin 20 5.0
U1 pin 27 5.8
U1 pin 28 5.7
U2 pin 10 12-15
U4 pin 1 12-15
U4 pin 11 5.0
U5 pin 1 0 to 0.1
U5 pin 7 0 to 0.1
U6 pin 6 0 to 0.5
Tap
M E N U
, then tap
D I S P L AY
to bring up the K2's secondary
menu (SEC will be flashed). This menu is used to configure various
features that are available in K2 revision 2 firmware.
Use the VFO knob or the
B AN D +
/
B AN D -
switches to scroll to the
P A menu entry. If you see PA -- , the KPA100 microcontroller is
not communicating properly with the K2. Refer to Troubleshooting.
The PA parameter will probably be set to OFF initially. Hold
E D I T
to highlight the parameter, then scroll until you find an entry starting with
E
(error status). The error status should be E12, where 1 indicates that
the KPA100 is in bypass (QRP) mode, and 2 indicates that no KPA100
power supply is present. If you see any other error numbers, see Error
Status in the Troubleshooting section.
Set the PA parameter to ON. Tap
M E N U
to return to menu scroll
mode.
Tap
D I S P L AY
to return to the primary menu (PRI will be flashed).
Tap
M E N U
again to return to the normal frequency display.
Turn off the K2 and disconnect the power supply.
Disconnect the KPA100 end of the ribbon cable.