Garmin GNS 480 Installation Manual

Also see for Apollo CNX80: User Newsletter User Newsletter Supplemental Flight manual Pilot's guide Data list

Periodic MaintenanceGNS 480 (CNX80) Installation Manual560-0982-01 Rev A 6-16 PERIODIC MAINTENANCE6.1 EQUIPMENT CALIBRATIONNo scheduled servicing tasks are required on the GNS 480. The GNS 480 design requires no internalmanual adjustments.6.2 VOR CHECKSEven though the GNS 480 is designed to utilize the most state-of-the-art DSP technology and maintain avery high accuracy and repeatability record, it still must undergo the VOR accuracy check required forIFR flight. Refer to CFR 14 paragraph 91.171. Every 30 days verify the limits of the permissibleindicated bearing error.The last VOR check information may be entered into the GNS 480 via the Nav VOR Mode then on theTest Log Menu page.6.3 CLEANINGThe front bezel, keypad, and display can be cleaned with a soft cotton cloth dampened with clean water.DO NOT use any chemical cleaning agents. Care should be taken to avoid scratching the surface of thedisplay.6.4 BATTERY REPLACEMENTThe GNS 480 includes an internal battery that will last about 10 years. The battery is used for internalRAM memory and GPS system information. Regular planned replacement is not necessary. The GNS480 will display a "low battery" message when replacement is required. Once the low battery message isdisplayed, the battery should be replaced within 1 to 2 months.If the battery is not replaced and becomes totally discharged, the GNS 480 will remain fully operational,but the GPS signal acquisition time will be increased. This acquisition time can be reduced by entering anew seed position each time the unit is powered on. There is no loss of function or accuracy of the GNS480 with a dead battery.The battery is not user replaceable. To replace the battery, contact the Garmin AT repair station orfactory authorized repair station.6.5 DISPLAY BACKLIGHTThe display backlight is rated by the manufacturer as having a usable life of 20,000 hours. This life maybe more or less than the rated time depending on the operating conditions of the GNS 480. Over time, thebacklight will dim and the display will not perform as well in direct sunlight conditions. The user mustdetermine by observation when the display brightness is not suitable for its intended use. Contact GarminAT repair station or factory authorized repair station when the backlight requires service.