確認 and 点検: checking information and inspecting equipment
Compare checking meeting times with inspecting equipment, and avoid guessing availability from an inspection notice alone.
Checking accuracy or whether an action occurred
確認, read かくにん, means checking information or facts. 集合時間を確認しました。 means that the meeting time was checked.
鍵をかけたか確認してください。 asks someone to check whether the door was locked. The issue is whether the action was performed, rather than the key's mechanical condition.
Inspecting condition and possible faults
点検, read てんけん, means inspecting equipment or an object for problems. 作業の前に機械を点検しました。 says that the machine was inspected before work.
点検でブレーキの異常が見つかりました。 says that a brake problem was discovered during inspection. An inspection does not necessarily end with a finding that everything is normal.
Overlapping procedures and separate results
点検のあと、修理が必要か確認します。 says that the need for repairs will be checked after inspection. An inspection may itself include several acts of checking.
エレベーターは点検中です。 indicates that the elevator is being inspected. Check additional wording such as 利用できません to determine whether it can be used.
Does 機械を点検しました。 alone tell you that the machine had no problems?
Show the answer and why
No. It reports that an inspection was performed. A separate statement is needed to establish its result.