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 Step 25: Some Blue LEDs light out of sequence
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By: Anonymous: solder_guy () on Wednesday, December 30 2009 @ 08:36 PM PST (Read 2317 times)  
Anonymous: solder_guy

I am stuck at Step 25. All the blue LEDs are working .. but some out of sequence.

D62 only lights when D26 lights.
D32, D63 and D64 light when D62 is supposed to light.

I have resoldered the IC and checked for bad solder points .. all look good.

I tried to download the schematic .. but that link is not working ..

Help .. TIA

By: Windell (offline) on Wednesday, December 30 2009 @ 09:04 PM PST  

Sounds like you may have a backwards LED. There is a flatted side on the clear plastic "collar" of each LED, corresponding to the side with the short lead, and which should be pointing towards the rounded (not squared) solder pad. Also, double check the soldering on resistors R1 through R6.

Windell H. Oskay

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By: solder_guy (offline) on Wednesday, December 30 2009 @ 09:52 PM PST  

You are exactly RIGHT .. I found that LED 62 is backwards .. also got the schematic to FINALLY download .. gotta look at it through a magnifying glass though ... Thanks! Just replaced LED 62 with the spare .. and all is well!


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By: solder_guy (offline) on Sunday, January 03 2010 @ 01:34 PM PST  

FInished the clock on New Years' Day .. works great .. everyone at home and work loves it! It is a work of art and engineering ! Thanks for making this kit happen! - Rob

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