Elecraft K1 - Manual (Page 37)

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E
LECRAFT
7. Alignment and Test, Part I
In this section you’ll become familiar with K1 operation, while
testing control circuits and aligning the VFO and receiver.
The Tap/Hold Rule
Each of the push-button 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). The upper
label on each switch shows the TAP function (white lettering), and
the lower label shows the HOLD function (yellow lettering). To
highlight this in the text, we use two different typographical styles
to identify switches:
T A P and H O L D .
Initial Tests
i
If any test or alignment step fails, refer to the
Troubleshooting section (Appendix E).
To improve the visibility of the LCD during testing, you
should prop up the front edge with a non-conductive object (small
box, book, etc.). Note: Do not attach the KTS1 tilt stand at this
time. With the bottom cover removed, it could cause a short.
Set AF GAIN fully counter-clockwise (minimum volume).
Make sure the K1 is turned OFF (power switch S1 out).
Plug your power supply or battery into J4 on the rear panel.
LED Test
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When you turn the K1 on the next step, watch for the
LED test. You should see the ATTN (yellow) LED turn on briefly,
followed by the RIT/XIT dual-color LED (green, then orange).
Turn on power to the K1. If you see or smell smoke, or a
component feels hot to the touch, disconnect the power
source immediately. Locate the source of trouble before
proceeding.
If you did not see the LED test, refer to Troubleshooting.
LCD and Error Codes
You should now see E 2 7 on the LCD. This is an error code
which occurs when the K1 self-test finds that the Filter board is not
plugged in. (Error codes are listed and described in the
Troubleshooting tables.)
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If the LCD is blank, it may indicate that one or more
switches are closed. Check for shorts on all switch lines.
Tap any switch to clear the error code. You should then see
E 4 2 , which indicates that the self-test found the VFO signal
missing. This is correct, since the VFO inductor, RF-L1, has not yet
been installed. (When the VFO is functioning normally, you'll see
the operating frequency displayed.)