FAQ - Frequently Asked Questions - Knowledge Base

What is the jumper at J4/J5 used for?

The jumper at J4/J5 is used to set the fan mode. You can set it to "AUTO" and the fan speed will be adjusted automatically according to the temperature (thermal sensor needs to be connected) or you can manually set it to use low or high speed.

Following are the settings you can use: 
Jumper on J4 = AUTO 
Jumper on J5 = Manual/High Speed 
No jumper at all = Manual/Low Speed