Recently opened up a 120v,60hz Coffee machine, and the pump has a large
diode in series with one of its 120v input leads. The pump works either with
this diode, or without. Just wondering why its there?

Thanks
--
Kim..."A Man Of True Frankenstinean Proportions"

--
Kim..."A Man Of True Frankenstinean Proportions"

Kim Sleep wrote:
Recently opened up a 120v,60hz Coffee machine, and the pump has a large
diode in series with one of its 120v input leads. The pump works either with
this diode, or without. Just wondering why its there?

That is probably the thermal cut-out. It turns off the power if the
machine overheats. Do not bypass this - If it is open then the machine
overheated and will likely do so again. Without that part the machine
could melt or catch fire. If you must try to fix it get a proper
replacement part.

BTW Most coffee makers do not have pumps. The boiling water forces it
through the pipe. I assume this part is attached to the bottom of the
heater.

Are you sure it is a diode? I'd bet it is a thermal fuse. You can tell by
the thermal rating and current limit rating which is usually stamped on the
body. Another way to check is to use a continuity/diode tester. A diode
will only conduct in one direction with a small ~(0.7V) drop while the fuse,
if still good, will look like a dead short in both directions.

The fuse is a safety device to prevent overheating and the device from
catching fire.

Bob


"Kim Sleep" wrote in message
.. .

Recently opened up a 120v,60hz Coffee machine, and the pump has a large
diode in series with one of its 120v input leads. The pump works either
with
this diode, or without. Just wondering why its there?

Thanks
--
Kim..."A Man Of True Frankenstinean Proportions"

--
Kim..."A Man Of True Frankenstinean Proportions"

This sounds like the thermo fuse. If it needs replacement, contact the
manufacture rep, or a service centre for your pump to have the correct
replacement. If it blows again, then the pump, or something along its chain
of operating also needs replacement. If you bypass the thermo fuse, and
there is a fault, the result can lead to a burned motor, or worse.

--

Jerry G.
=====

"Kim Sleep" wrote in message
.. .

Recently opened up a 120v,60hz Coffee machine, and the pump has a large
diode in series with one of its 120v input leads. The pump works either with
this diode, or without. Just wondering why its there?

Thanks
--
Kim..."A Man Of True Frankenstinean Proportions"

--
Kim..."A Man Of True Frankenstinean Proportions"