Nako Na-617a User Manual -

Press to choose between adjusting the hour or the minutes. Press D to set the desired alarm time. Press M to save and exit back to the normal clock mode. 3. Activating/Deactivating the Alarm and Hourly Chime

Honest truth: Nako doesn’t maintain a public manual archive. But here are three places that actually work: Nako Na-617a User Manual

During playback: Press Menu → A-B → Set point A (press Menu again) → Set point B. Playback loops A-B until Menu pressed. Press to choose between adjusting the hour or the minutes

Menu → System → Factory Reset → Enter 0617 → Confirm. Nako Na-617a User Manual