+DavidMil Posted February 7, 2018 Share Posted February 7, 2018 Does anyone know if the little 3" x 29/32" (76mm x 23mm) circuit board for the 3 LED's in the 1200XL came in more than one size? I'm thinking of making one for myself, since one of my 1200XL's is missing this board. And a few more while I'm at it. DavidMil Quote Link to comment Share on other sites More sharing options...
+kheller2 Posted February 7, 2018 Share Posted February 7, 2018 PILOT runs and some of the very early units had a slightly smaller board that was a bit loose. The majority of them all are identical. Quote Link to comment Share on other sites More sharing options...
Gunstar Posted February 7, 2018 Share Posted February 7, 2018 If you make them with modern full-color LED's with a dip switch or something to change colors, I'll buy a couple of them. Something I was contemplating doing with my boards on my own, at some point, but it's easier for me if you make them. Quote Link to comment Share on other sites More sharing options...
+DavidMil Posted February 7, 2018 Author Share Posted February 7, 2018 I thought about making a two color version for LED's 2 and 3 to possibly signal other things (like caps lock or something). But since they are both driven by a transistor tied to the PIA chip, I decided that that was more trouble than it was worth. David Quote Link to comment Share on other sites More sharing options...
ACML Posted February 7, 2018 Share Posted February 7, 2018 (edited) Does anyone know if the little 3" x 29/32" (76mm x 23mm) circuit board for the 3 LED's in the 1200XL came in more than one size? I'm thinking of making one for myself, since one of my 1200XL's is missing this board. And a few more while I'm at it. DavidMil I've only come across two types. Most have a teal green PCB and a few I've seen have a tan PCB. Both were tight fits. A common failure on these is that the solder pad is so tiny that the solder pad breaks loose and the LED stops working, but a new dab of solder fixes that up quick. Edited February 7, 2018 by ACML Quote Link to comment Share on other sites More sharing options...
+DavidMil Posted February 7, 2018 Author Share Posted February 7, 2018 A common failure on these is that the solder pad is so tiny that the solder pad breaks loose and the LED stops working, but a new dab of solder fixes that up quick. I can vouch for that. The pads on mine were 1 mm in OD, and with the hole in the center, there was about a quarter of millimeter left around the hole to solder. Because it's a one sided board (and no plated through holes), the pads lifted up on several of the LED legs as I removed the LED's. When I say came up, I mean that they were sucked into my desoldering gun. This is the first time I have seen copper traces so thin you could almost see through them (well that may be a bit of an exaggeration, but not much)! David Quote Link to comment Share on other sites More sharing options...
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