Fade music out at the end of a CD or tape.  An abrupt stop to music will distract people from the service.
 

Make sure "first time microphone users" have a 2-minute training session on how to hold the mic and speak into it.

Have a block diagram of your sound reinforcement system. A block diagram shows how all of your systems’ components are wired together. A block diagram is a must for a technician doing testing or repair work."
 

Use the auto-reverse feature on tape decks when recording a sermon.  "End of tape" should be defined as start of the clear tape, not the physical end (clunk) of the tape.

Clean audio components with compressed air and a 2-inch paint brush.

Turn off audio equipment in the proper order.  The simple rule is “Amps on last, off first.”

Offer annual "How To Operate The Church Sound System" classes.  From these classes, you can build a team of operators.

Turn off microphones that are not in use.  This prevents sounds from knocked microphones or any ambient noises from being detected.

Be kind to your microphone stands.  Dust them, check for problems, and replace when necessary.

Keep backup equipment on hand. If an expensive backup, like a mixer, isn't available, have something else on standby, like a portable system.