Icom IC-756 PRO (IC 756 PRO IC756PRO) transceiver mods reviews software and diagrams

   
 
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18 August 2019, 2:51 UTC 


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Icom IC-756 PRO (IC 756 PRO IC756PRO)
IC-756 PRO
Programming interface schematics for Icom:
Programming software for Icom IC-756 PRO (IC 756 PRO IC756PRO) :
PDF User Manual for Icom IC-756 PRO (IC 756 PRO IC756PRO) :Icom IC-756 PRO Instruction Manual
PDF Adjusments Procedures Manual with schematics for Icom IC-756 PRO (IC 756 PRO IC756PRO) :
Schematics for Icom IC-756 PRO (IC 756 PRO IC756PRO) :

Mods for Icom IC-756 PRO (IC 756 PRO IC756PRO) :
    Icom IC-756 PRO (IC 756 PRO IC756PRO) 6M oscillation problem
    Icom IC-756 PRO (IC 756 PRO IC756PRO) Eliminate an adjacent channel noise problem (QST mod)
    Icom IC-756 PRO (IC 756 PRO IC756PRO) CW Filter Shape Selection
    Icom IC-756 PRO (IC 756 PRO IC756PRO) Expand tx-freqeuncy

Icom IC-756 PRO (IC 756 PRO IC756PRO) technical specifications :  Icom IC-756 PRO (IC 756 PRO IC756PRO) technical specifications



Icom IC-756 PRO (IC 756 PRO IC756PRO) Expand tx-freqeuncy

You need a very fine solderiron to remove the 3 diodes from the mainboard!
You have to remove the bottomcover of the 756PRO.
When you removed the cover and you have the backside of the 756-PRO facing you , you can locate the dsp-box on the left-side (the shiny-box). You have lift the dsp-box (with care !) out of the mainboard.

After removing the dsp , you can see a row of diodes with some spaces. You can see on the right of the row the number "3751" , that diode is already missing , hi.
You have to remove 3 small diodes located on the left side of number "3751" (diodes 3752 , 3753 and 3754) when you have a version "#03" Icom IC756-PRO.
When you have a version "#02" : remove diode 3751 , 3752 and 3753 !

            R R R I I I X X I I X X I I I X  diode-row IC756-PRO version "#03"
                  3     3         3       3  before modification .
                  7     7         7       7
                  6     6         5       5
                  3     0         5       1 

            R R R I I I X X I I X X X X X X  after version "3" mod.
            R R R I I I X X I I X X I X X X  after version "2" mod.           

I = diode installed
X = diode not installed
R = resistor 

Trouble to find the diode-row ? It's about 1/2 inch located under the CPU.
If you can't find out the version of your 756-PRO (#02 or #03) , look at the topside of the box .( see white sticker).
If there's something going wrong .............. i've no reponsebility
This info is from a Icom-infosheet .

Click to enlarge

Click to enlarge


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