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.

The microswitch on the bean hopper is there so the grinder won't run if the hopper is improperly installed. It is not necessary if you pay attention when installing the bean hopper. You can remove it and connect the two wires, properly insulate the connection with electrical tape and you are good to go.