Icom IC-746 PRO (IC 746 PRO IC746PRO) transceiver mods reviews software and diagrams

   
 
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11 May 2021, 11:14 UTC 


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Icom IC-746 PRO (IC 746 PRO IC746PRO)
IC-746 PRO
Programming interface schematics for Icom:
Programming software for Icom IC-746 PRO (IC 746 PRO IC746PRO) :
PDF User Manual for Icom IC-746 PRO (IC 746 PRO IC746PRO) : Icom IC-746 PRO Instruction Manual
PDF Adjusments Procedures Manual with schematics for Icom IC-746 PRO (IC 746 PRO IC746PRO) :
Schematics for Icom IC-746 PRO (IC 746 PRO IC746PRO) :

Mods for Icom IC-746 PRO (IC 746 PRO IC746PRO) :
    Icom IC-746 PRO (IC 746 PRO IC746PRO) Heatsink for PA Driver
    Icom IC-746 PRO (IC 746 PRO IC746PRO) backlight problem
    Icom IC-746 PRO (IC 746 PRO IC746PRO) Power adjust
    Icom IC-746 PRO (IC 746 PRO IC746PRO) AM tx improvements
    Icom IC-746 PRO (IC 746 PRO IC746PRO) Transmit Problem
    Icom IC-746 PRO (IC 746 PRO IC746PRO) SSB Monitor Level Fix
    Icom IC-746 PRO (IC 746 PRO IC746PRO) EU version
    Icom IC-746 PRO (IC 746 PRO IC746PRO) TX modification

Icom IC-746 PRO (IC 746 PRO IC746PRO) technical specifications :  Icom IC-746 PRO (IC 746 PRO IC746PRO) technical specifications



Icom IC-746 PRO (IC 746 PRO IC746PRO) SSB Monitor Level Fix

CAUTION: Be certain to observe Anti-Stat precautions for an ESD-Safe work area.
  1. Remove the bottom cover of the IC-746Pro.

  2. Remove all cables and connectors and from the Main Unit PC bd.

  3. Remove all screws from the Main Unit PC Board, while noting in particular the following three screws:

    1. Remove the machine screw on IC1240, which bonds the heat sink tab to the cast metal chassis;

    2. Remove the screw from the rear panel to the plastic ALC and SEND connector housing; and

    3. Pay attention to the center PC bd screw which holds a grounding spring contact against the underside of the metal shielded sub-assembly.

  4. Change R1080 from 100K ohm to 22K ohm. R1080 is located on the bottom side of the Main Unit PC Board, next to IC1080, from pin 3 to C1080 (+).

See Service Manual Figure 9-9, Main Unit Bottom View, Page 9-8
See Service Manual Schematic Main Unit(1) Page/Figure 12-3

Alternatively, place a 30K in parallel with R1080, ~22K net value.
Preferably use a surface mount resistor of the same size, or a 1/16 watt discrete resistor, using a surface mount tip, ESD protected soldering iron at approximately 650 Deg F.

This modification raises the SSB Monitor level only, and provides approximately +9dB of additional gain. Adequate SSB Monitor volume can now be achieved when the Monitor Menu is set to ~90% without boosting the AF Gain setting.

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