AW: [Elecraft] Ser 4993 - First Problem

[Renardy, Martin]

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



-----Ursprüngliche Nachricht-----
Von: elecraft-bounces at mailman.qth.net [mailto:elecraft-bounces at mailman.qth.net] Im Auftrag von G3VVT at aol.com
Gesendet: Thursday, June 30, 2005 1:00 PM
An: nz8j at woh.rr.com; elecraft at mailman.qth.net
Betreff: Re: [Elecraft] Ser 4993 - First Problem


 
In a message dated 30/06/05 03:24:07 GMT Daylight Time, nz8j at woh.rr.com  
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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