Reset system after smoke alarm sounds & user manual request?

HOW TO RESET AFTER SMOKE ALARM HAS ACTIVATED and HOW TO GET A USER MANUAL? I have a Scantronic 9827 house alarm. Since the smoke alarm went off the screen is showing a flashing c7 , but no matter what I try, I can’t reset the system. Any ideas what I should do? Or, does anyone know how I can get hold of a manual?