Completing the Clock Tower is one of many puzzle areas in Resident Evil 2 - and requires you to Mr X on your tail.
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How to reach the Clock Tower
First, make sure you have the Library Jack. You need to use this in the Library, allowing you to move the shelves, creating a shelving bridge to reach the Main Hall 3F.
Once there head south, and take the door into the Clock Tower in the south-west.
You also need to make sure you have the Large Gear your possession before you can start the Clock Tower puzzle.
Resident Evil 2 Clock Tower puzzle solution
Inside are a few slots to place Gears, as well as a Repair Plan File.
It's worth also continuing west through to the dead end corridor, where at the end is a consumable as well as a Mr Raccoon collectible on the windowsill.
When you have the Large Gear at hand, insert it into the right-most mechanism. This will drop a set of stairs, allowing you to climb up.
At the top is another mechanism, with the Small Gear.
Get this, and head back down and place this in the mechanism on the other side of the lower level.
Playing the DLC? Check out our list of Ghost Survivors Mr Raccoon locations. Elsewhere, our full Resident Evil 2 walkthrough explains every aspect's of Leon and Claire's campaigns, including C4 Detonator and Battery locations, Heart Key location, how to stop Mr X, the Clock Tower puzzle, Sherry block puzzle in the Orphanage, the Power Panel Parts puzzle solution, how to escape the Incinerator and the Chess Plug puzzle solution. Not only that, we also provide all Locker Code solutions, the Leon Desk puzzle solution, all Resident Evil 2 Safe Codes and Portable Safe solutions and the Hiding Place locations.
Finally, get the Large Gear from the first mechanism, climb the stairs, and place it in the empty mechanism upstairs.
Doing this will activate the bell, knocking the Box to the ground, giving you the second Power Panel Part upon inspection.
Now it's time to leave the Police Station. You'll be able to return, but make sure you've searched all the rooms and got all the items you've want right now - including those that require safe codes, portable safe solutions and locker codes - then head to the 1F east wing, taking the stairs in the north-west, back to B1, where you'll complete the Power Part puzzle.