On V3 version of 2F, It could happen that only one LED lighting
The gripper shown in the picture bellowis the previous model (V3) of the 2F-85 gripper, where there used to be 2 LED lights, one on each side.
However, in the latest version (V4) of the 2F-85 gripper, the design was changed to 1 LED light. (See below)
The serial number of the gripper is now engraved where the 2nd LED was located on the previous model.
Solution
The new (V4) electronic PCB fits the previous (V3) model of the 2F-85, but one of the LEDs does not light up because there is no LED on one side.
We do this when we repair previous (V3) models. We use the current PCB board.
So, the issue with the LED light is not a problem.