GP1670F_1870F Operator's Manual - Furuno USA

12. MAINTENANCE, TROUBLESHOOTING12.2 How to Replace the FuseThe fuse (3A) in the fuse holder on the power cable protects the display unit from highelectric current and equipment fault. If you cannot turn on the power, check the fuseto see if it has blown. If the fuse has blown, find the reason before you replace the fuse.If the fuse blows again after the replacement, contact your dealer for advice.Use the proper fuse.WARNINGUse of a wrong fuse can result in fire and damagethe equipment.12.3 TroubleshootingThis section provides simple troubleshooting procedures which the user can follow torestore normal operation. If you cannot restore normal operation, do not check insidethe unit. Have a qualified technician check the equipment.ProblemRemedyGeneral TroubleshootingYou cannot turn onthe power.No picture appearseven though thepower is on.There is no responsewhen a key ispressed.• Check for blown fuse.• Check that the power connector is tightly fastened.• Check for corrosion on the power cable connector.• Check for damaged power cable.• Check the battery voltage is 10.8 to 31.2 V.Press the POWER/BRILL key and rotate the RotoKey TM clockwiseto raise the brilliance.Turn off and on the power. If you do not get a response, the keyis damaged. Contact your dealer for instructions.Plotter TroubleshootingPosition is not fixedwithin 90 seconds.Bearing is wrong.The track of yourboat is not plotted.• Check that the antenna connector is tightly fastened.• Check the number of satellites received, on the GPS StatusDisplay.• Check if [POSITION&SOG/COG] in the [SELECT INPUTDEVICE] menu in the [INTERFACE] menu is set to [InternalGPS]. Execute [RESTART GPS] in the [INTERNAL GPSSETUP] menu in the [SYSTEM] menu.Check the magnetic variation setting at [COMPASS SETUP] inthe [SYSTEM] menu.Check that the track is turned on. Operate the [Track] soft controlto turn track on.12-2