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ICOM IC-756 Expand Transmit Frequency Mod [message #307] Sun, 16 January 2011 23:58 Go to next message
root is currently offline  root
Messages: 208
Registered: December 2004
Senior Member
Notice: ICOM does not guarantee this to expand the frequency.

How to change full coverage transmit:
Remove the W805 jumper chip on MAIN board with a soldering iron.
Locate the jumper matrix located near the IC803.

What to do:
Remove bottom cover of ICOM IC-756. On the MAIN board you will see IF filters and a daughter board (DSP filter) on the right side. The W805 jumper and IC803 chip is lohoneyed under the DSP board. You have to remove the DSP board (carefully) and look for the part labeled IC803 and the line of jumpers (little green parts). When done, unsolder the W805 jumper. Install the DSP board and put the bottom cover back.
         [W801]     |               |
         [W802]     |               |
         [W803]     |    IC 803     |
         [W804]     |               |
REMOVE==>[W805]     |     CHIP      |
         [W806]     |               |
         [W807]      ---------------

This info is from the ICOM SERVICE INFORMATION sheet.

[Updated on: Mon, 17 January 2011 00:02]

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Re: ICOM IC-756 Expand Transmit Frequency Mod [message #3121 is a reply to message #307] Wed, 23 September 2015 10:46 Go to previous message
CybJaffe is currently offline  CybJaffe
Messages: 1
Registered: September 2015
Location: Spain
Junior Member
Thanks for sharing such a useful information. I am really interested in your topic. May be i will implement this in future. Can you please tell me something about the J17 and J21 board ICs? Which ICs you are using here? And what is their specifications?
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