Modifications for the ICOM - RogerK

e inserted as the last step.Note: Do not insert the lithium cells at this time. The cells willStep 2: Remove the bottom cover from IC-751 and pull out the RAM memory board.Step 3: Carefully solder the negative lead (black) of the dual battery board to the RAM board ground trace at IC2 pin 7.Step 4: Carefully solder the positive lead (red) of the dual battery board to the RAM board at the junction of diodes D1 and D2.The RAM board connections should look like the photo above.Step 5: Re-install the RAM board back into the 751. You can leave the dual battery board dangling outside temporarily.Step 6: Monitor the voltage at the red wire on the dual battery board. You should see approximately 3.0 volts coming from theRAM board. Now, power on the 751, the voltage should now be approximately 4.8 volts if everything is ok.Step 7: Install the dual batter board in the 751 bottom chassis. I used the mounting holes reserved for the speech module. Ifyou have the speech module installed you will have to look for a suitable location.Fortunately, there is plenty of room in the bottom chassis to mount the board. I can't recommend using double sided foam tapeas the adhesive usually fails after some time so its best to use screws.