| Table of Contents |
|---|
Get the results you want whether you're in training or trying to shed a few pounds with the Livestrong LS8.0T folding treadmill. The LS8.0T is equipped with a 2.5-horsepower continuous-duty motor, powerful enough to deliver speeds of 0.5 to 12 miles per hour and an incline range of 0 to 12 percent (in 0.5-percent increments). As a result, you don't have to compromise when working out--a must when training hard. The treadmill is also extremely comfortable thanks to the MaxComfort cushioning system. The system's adjustable cushioning technology allows you to customize your workout with a softer or firmer feel. With more support for each part of your stride, you'll recover quicker between workouts.
...
https://fitnessgraveyard.com/collections/livestrong-treadmill-parts
| Part | Description | URL |
|---|---|---|
| 1000111476 | Johnson Fitness 1000111476 Motor Control Board AFG HORIZON |
Problem
- Short when powered on. Trips breaker.
- Problem resides on the motor control board. MLH0910PC Johnson.
...
Testing MOSFET
A simple test to determine if the MOSFET has failed is to check for open circuit between Drain and Source.
Set multi-Meter to Diode Mode
| Positive Lead | Negative Lead | Expectation |
|---|---|---|
| Drain | Source | Open Circuit |
Turns out, our MOSFET is dead.
Schematic
Repair
Parts
...
Schematic
Repair
We identified that the MOSFET, power diode and the large capacitors needed replacement on our motor control board.
Replacement Parts
| Part | Specification | Original Part# | Replacement Part# | Image |
|---|---|---|---|---|
| MOSFET | Power Mosfet | IRFP260N | IRFP260N |
|
| 2x Capacitors | Aluminum Electrolytic Capacitors - Snap In 680uF 200 Volts 20% | LSG681M2D-2540 | LGR2D681MELA40 |
|
| Power Diode | 30A, 600V Ultra Fast Diode | F30U60ST | RURP3060 |
|
| TO-220 Insulation Kit | Insulation Kit required because the new diode does not have an insulated packaging. | - | TO-220 Insulation Kit | |
Other Useful Information
Testing the Treadmill
...
https://www.fitnessrepairparts.com/cart/ViewItem/49014509
...
Motor
https://www.youtube.com/watch?v=Ckn5pOMPHHY
...
- Disconnect the motor connections from the control board.
- Add paperclips to the connectors to facilitate connecting.
- Connect the paperclips to the battery. (Red to +, black to -)
- Motor should start to go.
Reverse Engineered Circuit for another Treadmill
Another:
References
| Reference | URL |
|---|---|
| User Manual | |
Sercice Manual | |
| FoulkesBrau #24 - Lets find the fault on this Trojan treadmill control board DCMD57P PT 1 | https://www.youtube.com/watch?v=gPR6Np6AoN4&t=1s |
| FoulkesBrau #41 - Lets find the fault on this Trojan treadmill control board DCMD57P PT 2 | https://www.youtube.com/watch?v=OrgnpCaxX2s |
| FoulkesBrau #42 - Lets finally repair the fault on this Trojan treadmill control board DCMD57P PT 3 | https://www.youtube.com/watch?v=ErWV33JC440 |
| 271 How to Repair Circuit for TreadMill - Circuit Explained /Troubleshooting | https://www.youtube.com/watch?v=maw1yFxSSjA&t=0s |
| Heatsinking considerations for Common Cathode Rectifying Diode | https://electronics.stackexchange.com/questions/447336/heatsinking-considerations-for-common-cathode-rectifying-diode |
| Electrical Engineering Stack Exchange | https://electronics.stackexchange.com/ |
...