​1- How to replace the Reciprocator

2- Color Change Mechanism ​

3- About The Potentiometer

4- Rotary Hook

5- How to Adjust Press Foot High

6- How to Replace the Stop Position Sensor

7- How to replace the 2nd gen screen

8- How to replace the thread break sensor

9- How to replace the main motor

10- How to replace the battery for 285 computer.