Ser 4993 - First Problem

[nz8j]

Well, everything went well until it was time to apply power for the first
time....  :)

---- All resistance checks were as they should have been to this point
---- 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
            ---- Doesn't appear to accept any button pushes at all, band +/-
does nothing,  as well as display, menu, etc
            ---- good news is no smoke (yet)
            ---- Not sure if it's significant or not, but the display seems
to flicker slightly, with the desk lamp off, it is noticeable


I've taken the boards out and rechecked all connections, etc, I can not see
anything obvious...

Any suggestions??

Thanks
Tim
NZ8J


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[Rolf Moberg, OH6KXL]

NZ8J wrote:
> ---- All resistance checks were as they should have been to this point
> ---- Applied power for the first time:
>             ---- heard the relays engage
>             ---- backlight came on
>             ---- Display is blank, nothing whatsoever in the display

Some builders have reported same kind of symptoms. Did you solder pin 1
of LCD?

Rolf
oh6kxl
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[G3VVT]

 
In a message dated 30/06/05 03:24:07 GMT Daylight Time, [hidden email]  
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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