Power off the kiosk & unplug the power cable
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Once powered off, unlock the rear bottom door using the keys provided.
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You will see the rear of the lockers, to the left of each locker will be a silver lock mechanism, press down on the screw above it to manually open the locker - please refer to the article here for further information.
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Once the locker is opened, you will see a spring bar which if pulled down will release the locker door from it's position - remove the locker door
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Within the locker on the right hand side you will see 3 Philips screws this is what is holding the locker mechanism in place - using a right angled Philips screwdriver/ratchet undo these screws.
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Once you have removed the screws the lock mechanism will be able to be removed, detach the two cables holding it.
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To re-attach the new locker, reverse the steps 6-4