64 RAYDATA Installation and Operation HandbookIf you release the keys before the count-down reaches zero, the displaywill return to the previous page and your settings will be retained.If you continue to hold the keys down for the full five seconds, so thatthe count-down reaches zero, then the factory reset will be performed.The version number is displayed, followed by the depth display, usingthe factory defaults.7.6 MaintenanceCertain atmospheric conditions may cause condensation to form on theRayData display window. This will not harm the instrument and can becleared by increasing the illumination setting to HI.Maintaining satisfactory operation of your RayData will depend on howwell you care for the equipment. The following basic maintenance tipscan save you time and money, as well as prevent unnecessary andpremature failures:• Always keep the unit as clean as possible.• Use a soft, clean cloth for cleaning. Do not use abrasive cleansers,chemical cleaners or solvents – use glass cleaners or a suitablegeneral purpose detergent.• Examine the cables for chafing or abrasions; clean and repair asnecessary.7.7 ServicingThe most common faults encountered are due to poor connections andpoor power supplies. You should check all connections and powersupplies thoroughly, checking that the power supply cable is sound andthat all connections are tight and free from corrosion, before schedulinga service visit or returning the unit.When running cables, consider the following:• Avoid running cables through bilges, and secure any coiled lengthsat regular intervals.• Avoid running cables close to fluorescent lights, engines, radiotransmitting equipment etc.• Check cabling for chafing or damage to outer casing, replace wherenecessary and re-secure.