icom_ex314_battery-replacement

Icom America,Inc.ICOM2380116"Ave NEBellevue,WA 98004425.454.7619RAM Card Backup Battery Replacement InstructionsIn the early 80s,the most cost effective way to implement data processing andmemory functions was through a DRAM(Dynamic Random Access Memory)tocontrol the CPU.This DRAM was a volatile memory integrated circuit which requireda lithium battery to retain its instruction set.The lithium batteries in these units typically lasted about 5 to 7 years beforereplacement was required.This was specifically noted in each of the Owners Manualsfor the products.This lithium battery can be replaced by the radio owner if care is used.The followingis the recommended procedure.CautionsDo not use an AC powered 3 Volt DC source,your grounded soldering iron tipcould short out the battery (+)terminal.Use a 3 Volt battery DC source only (2alkaline cells for example).Do not solder the external DC wires directly to the lithium battery tab pads.Ifyou do so,you will not be able unsolder the battery without having the wiresdrop off.If by accident you lose power to the RAM unit it must be sent to Icom America forreprogramming.Be careful not to damage or bend the connector pins on the radio side whileremoving or reinstalling the RAM card.Procedure1.Disconnect the power cable from the radio,and take the cover off.2.Unplug the RAM board and remove it from the radio.3.Temporarily solder a 3 V DC battery source across the existing battery terminals(see the suggested connection points on the circuit board as shown in thefollowing pictures).If by accident you lose power to the RAM unit,it must be sentto ICOM America for reprogramming.4.On solder the original lithium battery and replace it with a new one.(BR2325 1HC,Icom stock number 94503112.)5.Desolder your temporary 3 V DC source.6.Reinstall the RAM board into the radio.Page 1