ng@maxwell.physics.purdue.edu (Nicholas J. Giordano) (01/26/89)
I am having trouble getting my Lucas board to work. The symptom is simple: nothing happens when I power up. More precisely, the keyboard led flashes once, the screen goes white, and nothing more happens. I have tried the following (1) change U9 - I've tried 74ALS74, 74S74, 74LS74, and 7474. (2) install the jumper. (3) install the PAL grounding fix. (4) remove and reseat the Lucas board and all chips (many times). None of these changes make any difference. My Amiga still works fine with the 68000 in place. Note, I am using 16MHz 68020 and 68881, and a 16MHz clock. The Lucas board is getting power (I checked), and the clock is running (I checked that too). What should I try next? Has anybody had similar problems? Is there anyone nearby me who has a Lucas board - it might help if we talked directly. Many thanks in advance. Nick Giordano Physics Department - Purdue U. W. Lafayette, Indiana (317) 494-6418 or 589-8506
anakin@gpu.utcs.toronto.edu (Anakin Research) (01/27/89)
If your LUCAS board is not functioning at all, ie. it won't even flash the front LED then chances are there is a short or open on the board somewhere. I've had this problem reported several times and it has yet to be a bad part, in all cases but one it was a solder short which caused the problem. In the other case it was an open via. Fill all the vias with solder and that will solve that possibility. A few hours spent with an ohmmeter checking for shorts can do a world of good. If you check the board thoroughly and are still having no luck E-mail me and we'll take it from there. Even a simple logic probe can tell you alot, there are instructions on the disk which came with LUCAS on checking signals, but I'll bet dollars to donuts its a short or open. Good Luck ..... keep me informed ..... Brad