Both adjustment types should be done with the door closed and disconnected from the opener using the emergency release.
Garage door chain drive adjustment.
Adjust the chain on a garage door opener with help from a garage door spec.
Adjustments on the chain are located at or near the master link where the chain engages with the cable graphic below left.
Loosen the two lock nuts on the threaded rod.
Chain adjusts by shortening the chain itself.
On the master link you will see two or three nuts.
There may be an adjustment linked to the chain or an adjustment to the length of the door opener track.
Usually a pair of nuts are associated with the locking mechanism while one is concerned with the adjustment of the chain.
There are only a few ways that the chain can be tightened.
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You will have to apply a spanner to each and turn them in opposite directions.
Use the wrench to loosen the lock nuts and turn the adjustment nut to set the slack in the chain.