On 26 Aug 2006 at 4:02, W3FPR wrote: > > One often repeated error in assembly is failure to solder pin 1 of the Front > Panel U1 socket - result is a blank display. > > Peer carefully under the LCD and backlight assembly and see if pin 1 is > soldered. > If it is not soldered, therre is a way to solder it without removing the LCD > (which is a nasty task) - cut away a small portion of the plastic outside > pin 1 (cut at the bottom of the socket), so you can place the tip of the > soldering iron on the pin from the socket side while feeding a bit of solder > on the other side of the board. > > You may want to vow to always solder IC pin 1 first on all ICs during your > assembly. The pad for pin 1 is round as a unique marker while the others > are square. Sometimes the eyes miss that single round pin. > > 73, > Don W3FPR >
Well I reached the same point in the assembly of #4848. I had just read your posting and said 'well at least I won't make that mistake' - I am a seasoned builder and this is my second K2. Guess what, switched on for the first stage testing and lcd lit up, relays clicked but no display. Did a bit of tracing, got my dmm out, and you guessed it, pin 1 of U1 was not connected!! To avoid dismantling the front panel assembly and not wishing to mangle the ic socket I added a wire link soldered directly to U1 itself and to the lower end of R7. K2 now working fine at stage 1. 73 Dave G3YMC http://www.davesergeant.com _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
