The central point lock is broken. Users can try to unlock according to these situations and unlocking methods. First, all file cabinets cannot be opened: find that some oil is introduced into the lock core while the key is still there, and the key is also smeared before inserting the key. Turn the lock cylinder slightly left and right to see if it can be opened. Second, the key is available, and a single cabinet cannot be opened: This situation is most likely that the position of the iron rod inside is shifted. You can use the method to measure the drawer cabinet if conditions permit, and move the iron rod by gravity. Position, turn the key at the same time, as the orientation requires the user's knowledge of the cabinet or multiple attempts; if this method does not work, you can find an iron piece from the front, rear or bottom of the drawer to check whether the plate can be inserted into the iron bar.
