Dear all,
this is an important point, because I became a little bit sweaty after installing
the LCD, when I realized, that I don't have access to U1 anymore.
In the manual there should be a big warning: "Check soldering of U1" before
installing the LCD itself.
Regards
Martin
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Gesendet: Thursday, June 30, 2005 1:00 PM
An:
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Betreff: Re: [Elecraft] Ser 4993 - First Problem
In a message dated 30/06/05 03:24:07 GMT Daylight Time,
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writes:
---- Applied power for the first time:
---- heard the relays engage
---- backlight came on
---- Display is blank, nothing whatsoever in the display
---- turned rig off and back on, no relays this time, but still nothing in the display
Reply:--------------------------------------------------
Tim,
The item you should check is that you have soldered pin 1 on the K2 Front
Panel LCD driver U1.
I did miss this when I built my K2 as did a number of others. Not sure why
this happens. Pin 1 of all IC on the PCBs are different being a circular
copper track, though that is no answer why it is missed in the soldering.
The pin 1 on front panel U1 can be inspected with the board removed. However
due to the front panel switches and the LCD display positioned above it is
rather difficult to get a soldering iron in to solder the pad.
Some builders have removed the LCD to access the pad. As I had concerns in
damaging the LCD in the removal, ended up cutting a tiny "V" out of the
plastic corner on the lower edge of the IC socket, just enough to get a very small
soldering iron bit to the pad there and solder the pin. The IC socket plastic
removal is not seen as it is hidden when assembled.
Bob, G3VVT
K2 #4168
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