Keeping up with progress, in case this helps someone else...
I really wanted to get the circuit function down before I just started testing randomly.
I tested the TACH reed switch. It works fine. I can even move the belt and watch the numbers change on the console.
I also completely removed the motor from the system and used a light bulb in it's place. I bypassed the motor's thermal switch as well. The light bulb only lit briefly before going out. So, the problem is on the board and not the motor itself.
Then I followed the path I outlined in a previous post.
It looks like the MOSFET is gone. It's tests shorted no matter which pins or direction I use.
I removed the MOSFET and tried to test the board in system again. I'm guessing that either something else is out, or another safety feature is shutting things down. I am not reading any voltage change on pin #8 of the micro or the gate node where the FET was. It stays at a constant 0.15V regardless of the speed setting.
I have a new MOSFET on order. Will have to wait and see what happens.
I really wanted to get the circuit function down before I just started testing randomly.
I tested the TACH reed switch. It works fine. I can even move the belt and watch the numbers change on the console.
I also completely removed the motor from the system and used a light bulb in it's place. I bypassed the motor's thermal switch as well. The light bulb only lit briefly before going out. So, the problem is on the board and not the motor itself.
Then I followed the path I outlined in a previous post.
It looks like the MOSFET is gone. It's tests shorted no matter which pins or direction I use.
I removed the MOSFET and tried to test the board in system again. I'm guessing that either something else is out, or another safety feature is shutting things down. I am not reading any voltage change on pin #8 of the micro or the gate node where the FET was. It stays at a constant 0.15V regardless of the speed setting.
I have a new MOSFET on order. Will have to wait and see what happens.