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

   
 
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17 February 2019, 19:57 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) Eliminate an adjacent channel noise problem (QST mod)

The June 2002 issue of QST describes a modification to the 756PRO. Additional power supply bypassing is added to eliminate an adjacent channel noise problem.
The problem has been fixed in the 756PRO-II. Page 68

Here are more details:

Cures key-click-like noise (on CW) and rumbling noise (on SSB) due to IF passband coupling to the 8V supply rail. Occurs when strong signals are within 7.5kHz of the indicated frequency.

Remove the bottom cover of the 756PRO.
With the backside of the 756-PRO facing you, locate the DSP-box on the left-side (the shiny-box).

Lift the DSP-box (with care !) out of the mainboard.

C316 is a 100uF capacitor located underneath the DSP module.

Carefully solder 2 wires in parallel with C316, the PCB contact pads extend a bit on either side, and connect the wires to a 1000uF 16V capacitor.

Observe the polarities on both capacitors - the negative side of C316 is towards the front panel.

There's space to mount the new cap using double-sided tape next to the memory back-up battery.

This will improve the bypassing on the 8V rail and should cure the problem.

Click to view in full size.

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