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for ship-to-ship and 20 to 30 n.m. for ship-to-shore. Note that the radio barrier in the signal path, such as big boat, crane, building or mountain, can destroy VHF communications even for short distance. GENERAL KNOWLEDGE - 32 - MAINTENANCE mssmmsm' The FM-2510 is designed to provide trouble-free operation for years. It is. however, recommended to inspect and maintain the following points to minimize possibility of a equipment failure and assure optimum performance. Be sure to disconnect the power cable at the fuse holders before maintenance work. CLEANING Transceiver : Keep the unit clean and dry all times. Dust or loose dirt accumulated on the front panel and knobs should be wiped off with a soft, dry cloth. Use mild detergent and water on a cotton tipped swab or soft cloth in stubborn case. CAUTION Never use plastic solvents, such as thinner or acetone for cleaning. It may dissolve paint coating/marking on the front panel and cabinet case. Plugs : Check all plugs for dust or corrosion. If corroded, polish the contact and re-tighten securely. MAINTENANCE - 33 - ANTENNA SYSTEM CHECK Since the antenna is exposed to direct sunshine and/or salt water spray, it is subject to corrosion or salt water immersion at the antenna basement. The physical damage, such as crack, may sometimes be expected on the element under severe ship’s vibration. Should the trace of cracks or water immersion is found, contact your local authorized FURUNO dealer for servicing. The FM-2510 operates normally at any voltage between 11 and 15Vdc. If the battery voltage is out of ratings, check the battery liquid or the charging system of your boat. Check also rust or corrosion at the battery terminals and ship’s mains switch board for poor contact. BATTERY CHECK FUSE REPLACEMENT ( To prevent the transceiver from serious damage, two 10A fuses are provided in the snap-in fuse holders on the power cable. The fuse protects against overvoltage/reverse polarity of the ship’s mains or internal fault of the equipment. If the fuse has blown, first find the cause of the problem before replacing it with new one. Use the correct fuse. Use of the wrong fuse can cause fire or equipment damage. A CAUTION MAINTENANCE - 34 - TROUBLESHOOTING -x'^ris'w~?- - "" "-^ /vs >*&■ ^ MINOR TROUBLESHOOTING It is known that more than 50% of VHF troubles are raised not by the transceiver itself but by ANT/feeder or power supply system. The list below provides simple troubleshooting that can be done by the opereator. DO NOT ATTEMPT TO CHECK INDSIDE THE TRANSCEIVER. CARELESS HANDLING MAY CAUSE PERMANENT DAMAGE TO THE TRANSCEIVER. Symptom Possible Cause Remedy Nothing happens. 1. Power is off at mains switchboard. 2. Power lead is loose or pulled out. 3. Mains battery is flat. 4. Fuse has blown. 1. Turn mains switch on. 2. Secure plug firmly and check connections to battery. 3. Check battery liquid, charging system, etc. 4. Check mains voltage and polarity and then put 10 amp fuse. LCD display looks normal but no sound at all 1. Speaker is switched off. 2. SQUELCH setting is too high. (Turned too much clockwise) 3. VOLUME setting is too low. 4. External speaker connection (rear panel) is improperly made. 1. Hit [SHIFT] and [SPKR] keys in sequence. 2.3, To confirm audio output, turn SQUELCH fully CCW and turn VOLUME slowly CW. 4. Check external speaker connection. TROUBLESHOOTING - 35 - Symptom Possible Cause Remedy Noise but no or poor signal reception 1. ANT conncctor (rear panel) is loose or pulled out. 2. Antenna is smashed off. 3. Antenna cable is damaded or immersed with water. 4. Radio barrier (big vessel, crane, mountain, etc.) in the signal path. 5. Transmitter is too far away or transmitting in low power. 1. Fasten antenna plug tightly. 2. Install new antenna vertically. 3. Lay new cable (50 ohm coaxial cable). 4.5 Line-of-sight is a rule for VHF communications. “TX” mark appears but no or low output power. 1. Refer to items 1 thru 4 above. 2. POWER setting is “LOW”. 3. The channel is to be operated in low power under regulation. ("LOW” mark should appear.) 2. Set it to “HI”. 3. INTL CH15, 17 and USA CH13, 17, 67 are low power channels. TROUBLESHOOTING - 36 - Symptom Possible Cause Remedy “TX” mark won’t come on with PTT switch pressed. 1. Attempting transmission on a channel assigned only for reception ; CHI5 (USA), WXO thru WX9, ctc. 2. Transceiver is in “DW” or in "SCAN” mode. 1. Refer to channel list. 2. Press [SHIFT] key to return to normal mode. Can’t use private channel. 1. Private channels arc not programmed. 1. Ask your dealer for channel preset, (authorization required) Won’t scan nor mally on ”DW” or ’’SCAN” mode, (locked on a channel) 1. SQUELCH setting too low causing noise all the time. 1. Adjust SQUELCH so that noise just fades out. Turned abnormally to channel 16. 1. Had short power failure. 1. Select desired channel and function again. Check power line connections. TROUBLESHOOTING - 37 - DISPLAY...