Modifications for the ICOM - RogerK

Step 8: Turn the radio off and install the 20mm lithium cells in the holders. That's it, you're done.You can now check conveniently check each cells voltage including the Icom RAM cell with your VOM. Just connect the negativelead of the VOM to the chassis and touch the positive lead to the top (+) side of each cell. You may notice that the memory RAMcell voltage is slightly higher than the new 20mm cells on the dual battery board. This is because the Schottky diodes have lowerforward voltage than the diodes used on the Icom board. The 20mm cells are now powering the RAM and the Icom cell isfloating.In the future, when cell replacement is need, simply replace one cell at time and you will never have to worry about losing theRAM program.73sStuartThanks to Stuart for the modification.This modification is read 467 times.top of page19-07-1998(IC-756) IC-756 Expand TX FrequencyNotice: ICOM can not guarantee specification when expand frequency.How to change full cover transmit:Remove the W805 jumper chip on MAIN unit by soldering iron.Jumpers matrix located near IC803.What to do:Remove bottom cover of IC-756. On MAIN unit board you will see IF filters and daughter board (DSP filter) on the right side.W805 jumper and IC803 chip located under DSP board. You have to remove DSP board (get it up careful) and look for IC803 andline of jumpers (little green bugs). When it done, unsolder W805 jumper. Install DSP board and bottom cover back.---------------[W801] | |[W802] | |[W803] | IC 803 |[W804] | |REMOVE==>[W805] | CHIP |[W806] | |[W807] ---------------