Leeson #175291 motor controller Schematic Needed!

Thread Starter


Joined Sep 28, 2010
I have a couple of these in the shop that need repair and I can't find a schematic anywhere. I emailed Leeson but have had no response. They have no repair places here in Australia.

As far as I can tell by looking at them they are around 10 years old.

I've compared it with an earlier model of the same controller which I do have a schematic for, but there's not much in the way of similarity.

Can anyone help out?


Joined Jul 17, 2007
It's not a motor, it's a motor driver.

Here's the manual, but it does not include a detailed schematic:
Here's the technical manual page:

This may or may not be similar to the "guts" of your unit:
If it IS similar, I'm not terribly impressed with the design; as they are using 5 outputs from a single 40106 hex Schmitt trigger inverter as gate drivers for SIX IRFZ44 power MOSFETs.

Thread Starter


Joined Sep 28, 2010
Hi oidium45 and Sarge,

I did attempt to contact them again by email. But no reply at all, which is a real shame.

Sarge, its at least 10 years old, its a really early analogue design, but its really hard to follow without completely pulling it down and I really don't want to do that!

I had a look at the schematic of the one you posted, its not the same though.

I don't think its worth the time, but the customer wants them repaired.
But Leeson isn't so good at returning emails though.