Just to short two such pads as @ansis posted a pic of, earlier. Just use a croc clip to short the two blobs/pads together!
Depending on exactly which laser mech you are looking at - these are usually marked in the silkscreen printed text on the PCB.
That's already factory blob which shorts two pads on board, it comes such on new laser so you won't damage mounting it. Did you even looked at your own device in marked place?
Check green plastic rail for cracks and red gears for dirt in teeths
Those ribbon cables are LIF or low insertion force, you can disconnect them carefully if needed but first must solder antistatic jumper on laser board so not to damage laser diode.
the blob highlighted, bridges-together two solder pads, so when you remove it later, you see two solder blobs.
I am lazy tso use a croc clip instead to short the pads together before removing the ribbon cable to remove the laser: and remove the clip/solder bridge after reinstallation of the ribbon into the connector..
Yes ^ that is right!
Captain,
I believe that the photo Ansis posted shows what it should look like with the solder blob added to protect the laser diodes. You have said that the mechanism unscrews easily so all you need to do is unscrew it and turn it over so you can see the underside of the circuit board. Identify the two pads at the position shown in the photo and add a blob of solder across them. Then you can safely unplug the mech to work on it. When you have done so, reconnect, remove the solder blob and then refit the mech.