[Coco] [Color Computer] FD-502 schematic

[zaphod at mchsi.com]

I don't have a controller off-hand, but I do have the service manual from R/S.

I don't see the diodes on the layout diagram, but the BOM lists two 1N4148 
diodes.

As for resistors, the BOM lists two 10K resistors off of the WD 1773 
controller, (R1/2) and the rest are 1K (five of them?) Looks like all of the 
resistors are used as pull-ups to +5v.

Can you pinpoint the locations a little more? What IC are they next to?
> 
> Anyone have the schematic or an FD-502 controller physically handy?
> 
> While I was debugging a drive problem, I shorted something out, and the 
> controller began smoking.
> 
> There's s resistor with two (zener?) diodes solderer onto it near the 
> floppy edge connector that is now a cylinder of ashes.
> 
> Anyone know the value of that resistor and what kind of diodes they are?
> 
> The controller still works too...
> 
> 
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