Mechanical and Electronic Lock Servicing
Core concepts
Servicing spans preventive maintenance, troubleshooting, and repair for both mechanical and electronic locks. For mechanical systems, understand lubrication limits (graphite is for specific environments; light grease or dry film for high-use cylinders), spring replacement, cam and tailpiece alignment, and the causes of binding: misaligned strikes, sagging doors, worn hinges, and incorrect backset. Know how to disassemble a cylinder safely using a plug follower so pins and springs are not lost, and how to re-pin to a new key.
For electronic locks, know the power path (battery, hardwired, or PoE), the role of the controller and reader, fail-safe versus fail-secure operation, and the difference between standalone, standalone networked, and centrally managed systems. Understand credential types (PIN, proximity card, mobile credential) and basic access-control concepts: request-to-exit, door position switch, and Rex. Troubleshooting electronic locks usually starts with power and credentials before mechanics.
Traps to watch
Fail-safe means unlocked on power loss (life safety, egress doors); fail-secure means locked on power loss. Questions frequently reverse these. Another trap is assuming an electronic lock that will not open is a mechanical failure; check batteries, credential authorization, and controller communication first. Do not over-lubricate; excess lubricant attracts dirt and can gum tumblers.
Rule of thumb
Diagnose in order: power, credential, controller, then mechanics. For mechanical binding, adjust the strike or hinge before altering the lock.
Worked example
An electronic cylindrical lock reads a valid card but does not retract the latch. The reader beeps and the LED turns green, so power and authorization are fine. The likely fault is the mechanical drive or clutch inside the lock body, not the credential system.