All centrifuge maintenance must be clearly documented in the log book provided in the lab for each unit. This includes record of service history, warranties and warranty expiration dates as well as details of maintenance carried out by laboratory users.2. If no reliable record of centrifuge history is found, or records are inadequate or not up to date, the unit concerned must be immediately taken out of service. A service representative from the centrifuge manufacturer must be contacted and the unit completely inspected and parts requiring replacement ordered and replaced by the service representative. Proper records must be kept thereafter.