[Elecraft] K2 Initial testing

Sat Jan 31 21:14:00 2004

Hi Wil.
First I will check soldering of U1's socket on the front panel board.
Resoldering even if it looks OK.
Next check all pins of U1 that no pins is bendt under itself during =
install.
A magnifying glas or a stamp magnifying glas (what I use to check =
soldering) would be of great help here.
U1 on front panel board is the LCD driver. I think the problem is around =
here some place.
Good luck.
73 de Tom LA1PHA
----- Original Message -----=20
From: <[email protected]>
To: <[email protected]>
Sent: Sunday, February 01, 2004 12:04 AM
Subject: [Elecraft] K2 Initial testing


> Hi all,
>=20
> Today I finally got hold of the two missing push button switches and =
went along=20
> building my K2. When turning on for the very first time, I heard the =
relays clicking.=20
> Then I noticed that the LCD does not display all letters. After 10 =
seconds, the display=20
> does not show the default frequency, as described in the manual.=20
>=20
> Switching off and on again, the display only shows the letters "ELE" =
and that's it! You=20
> can see the background lighting flash at a constant pace, say two =
times per second. I=20
> have checked and re-checked all resistance measurements for the =
control board, the=20
> front panel and the RF-board. I also checked the soldering of the LCD =
and U1 (LCD=20
> driver). When resoldering the LCD, I noticed that all segments of the =
LCD light up.=20
> I checked also the voltage regulators on the control board: they give =
8,0 V and 4,9 V.=20
> The 4.9 V goes up and down from 4.92 to 4.98 V but every two seconds =
or so, the=20
> voltage drops for a moment to 4.85 V. The last thing I checked was the =
4 MHz=20
> oscillator of the MCU on the control board: everything was soldered =
just fine.=20
>=20
> When the K2 is switched on after being off for some time, the display =
sometimes=20
> gives "ELEC".
>=20
> In the mail reflector I cannot find any similar problem so I am very =
puzzled. Anybody=20
> got any ideas??
>=20
>=20
> 73, Wil Zeebregts, PE1JRZ
>=20
> e-mail:  [email protected] or [email protected]
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