Elecraft KRC2 Manual User Manual

Page 15

KRC2 Test Procedure

The KRC2 should be powered from its DC barrel jack using a +12 volt supply for its initial
power-up. No other connections should be made to the unit.

Connect the power source to the unit. After a short delay while the KRC2 performs

diagnostics, the front-panel LED should turn on to its dim level. If this does not happen, turn
power off to the unit and refer to the troubleshooting section.

Driver Relay Test: You will need a DC voltmeter for this procedure. Connect the black lead
(common) to the ground jumper located near J1 on the KRC2. The red lead should be used to
measure the voltage on each terminal of J6, J7, J8 and J9. Be sure to check the voltage at the side
connector of each terminal. The initial readings should be 0 volts on each terminal.
The Tap/Hold Rule: Each of the pushbutton switches on the front panel has two functions, one
activated by a TAP (short press) and the other activated by a HOLD (long press, about 1/2
second). To highlight this in the text, we use two different typographical styles to identify
switches: TAP and

HOL D

Holding should cause the KRC2 to change the driven band terminal. Only the 60m source

terminal should indicate 12 volts. The LED should be alternating between dim and bright.

Holding again should cause the 10m source terminal to indicate 12 volts, and all others to

remain off.

Continue this procedure, actuating the command until all HF source terminals have been

checked.

The

function is used to switch the AC1-AC3 outputs. First, hold , then tap

. The

AC1 source terminal should now indicate +12V and AC2 and AC3 source terminals indicate 0V.

Hold , then tap

. The AC2 source terminal should now indicate 12V with AC1 and AC3

at 0 V.

Hold , then tap

. The AC3 source terminal should now indicate 12V with AC1 and AC2

at 0 V.

Hold , then tap

. All three AC source terminals should now indicate 0 volts.

This completes checkout of the KRC2. Continue to the Final Assembly section.