On Saturday, March 26, 2016 at 12:52:38 PM UTC-4, wrote:
> I'm sticking this here, because I could not find any instructions on
> the web, and google does a fair job of finding googlegroups posts.
>
> The Capresso Infinity grinder (Model 505) is the only motorized
> conical burr grinder under $100. Which is why its failure to function
> yesterday caused us consternation. Basic troubleshooting revealed
> a chunk of plastic had broken off the bean hopper. My beloved wife,
> who is the only one to use the grinder, claimed ignorance.
>
> I took off the grounds recipient, and, with the torx bits of my screwdriver,
> removed the lower burr, discovering impacted coffeegrounds underneath.
> Still did not spin. NB: the lower burr is pushed upwards by three balls
> atop three springs. Do not lose these.`
>
> How to remove the housing mystified me, but I found that it was held
> on by five tabs, which I could depress with an old butter knife,
> allowing me to slide the housing downwards.
> The power cord is connected to a terminal block, which in turn is connected
> to two blue wires. One blue wire goes to a microswitch, which is closed
> when the bean hopper is properly installed. From there, another blue wire
> leads to the grinding timer switch. From there, a white wire goes to
> a little circuit board with a MZ-23 PTC thermistor on it, and four diodes..
> Red and black wires from the motor go to this PCB.
>
> Measuring continuity with a VOM was not very fruitful, so I turned
> the timer switch to 10, plugged the grinder in, and manually closed
> the microswitch. Success! as the motor spun.
>
> Monday I will try to order a new bean hopper, and perhaps a new
> microswitch, direct from Capresso.

I bought a used model and discovered the damaged bean hopper. disassembled as noted above and required a lot of force for me. Cut the two leads from the micro switch and wired them together to bypass the switch. I suppose I no longer have an idiot proof machine because it will now turn on regardless of the fact that the hopper is on or not. This is not recommended for safety purposes. I also know how not to put my finger in the toaster once I turn it on as well.