Subject: ICOM 706 MKII Extended transmit mod
From: "Len SantaMaria, KC2ADV"


<b>New online version:</b>
<br>
<a href="http://homepages.go.com/~kg0wx/706gmod.html">http://homepages.go.com/~kg0wx/706gmod.html</a>
<br>
_______________________________________
Extended transmit mod for the ICOM 706 MKII

This file may be freely distributed as long as it remains intact, with
no
modifications, additions, or deletions.
 
DISCLAIMER:
I assume no responsibility for damage or inaccuracies contained in this
document. In other words, USE THIS AT YOUR OWN RISK. It worked for me,
however I don't know if it will work for you.

WARNING #1: This mod requires the ability to remove surface mount
diodes.
Only those who are qualified to do this should attempt this mod.

WARNING #2: This mod seems to erase all memory channels, etc. You may
want
to save this info for reprogramming.

Disassembly:
1. Face the front of the radio towards you.
2. Remove the three screws in a row across the middle of the top of the
radio.
3. Remove the two screws at the top rear (on the sides) of the radio.
4. Pry the top cover off from the back.
5. Disconnect the speaker at the connector.
 
Modification:
6. Near the top rear of the main circuit board, there is an small,
oblong
metal can. Directly below the right side of this can is two surface
mount
diodes with a white silk-screened box around them. There is also what
appears to be a circuit board part number just to the left of it (mine
says
B4916D). Remove the LEFT diode in the box.
7. To the left of this, there is a test point marked CP3. Just to the
left
and above this test point is another box with two *vertically* mounted
surface-mount diodes (Note: there is also a place for 5 more
*horizontally*
mounted diodes, with 3 installed). Remove the LEFT vertically oriented
diode.

Reassembly:
8. Reconnect the speaker.
9. Put the top cover back on. Insert the top cover tabs into the slots
and
lower into position.
10. Replace all of the screws.

My radio did not require a reset, however I did lose all of my channel
memories. It seems to be able to transmit everywhere except below .5
Mhz. I
have not tested the power output at all frequencies yet.

I hope this helps everyone who have been waiting patiently for this mod.
 
Any comments can be directed to me:
Len - KC2ADV  
email: lenny@handy-man.com

From: "Rafel" <jarel@box43.gnet.pl>
Subject: IC706Mk2 mod

If you can read this, its come from Your www:

Len - KC2ADV  
email: lenny@handy-man.com
... wrote:

...
>Modification:
>6. Near the top rear of the main circuit board, there is an small, oblong
>metal can. Directly below the right side of this can is two surface mount
>diodes with a white silk-screened box around them. There is also what
>appears to be a circuit board part number just to the left of it (mine
>says B4916D). Remove the LEFT diode in the box.
>7. To the left of this, there is a test point marked CP3. Just to the left
>and above this test point is another box with two *vertically* mounted
>surface-mount diodes (Note: there is also a place for 5 more *horizontally*
>mounted diodes, with 3 installed). Remove the LEFT vertically oriented
>diode.

For first, my circuit board part number is B4916F, i don`t understand you
what diodes i must cut off, explain me, my smd diodes looks like this:
                              
                              O<>O 7
                              O    O 6
                              O<>O 5
  J25                       O<>O 4
                              O<>O 3
                     O   O                                           O   O
                   1[]    [] 2                         B4916F   8[]   []9
                     O   O                                           O   O
                                 CP3
                                <__]


Diodes: 1,2,3,4,5,7,8,9 are instaled
Diode: 6 is not instaled

My version is with Tone 1750Hz, European i think, RX 30kHz-200MHz, TX in
amateur bands only,
the serial number if needed is: 02101 buyed in 18.06.97 as new in Poland.
Sorry for my bugs.

Can You type me what diodes ? I think 1 and 3.


Rafaµ SP6-1313WR, Klub SP6KBE :) Kontakt:  jarel@box43.gnet.pl


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Info on the diodes from another European user: 

    d129
    ---- (d111 none)
    d112
    d113
    d114

d d                         d d
1 1                         1 1
1 1                         1 1
6 5                         8 9

D116 and D118 are responsible for out of band TX. D115 and D119 enables
RX from 30KHz to 200MHz. D113 is responsible for 6M RX and D114 is
responsible for 6M TX. I do not have info about D129 and D112.


Rafa3 SP6-1313WR, Klub SP6KBE :) Kontakt:  jarel@box43.gnet.pl

----------------------------------------------------------------
Date: Mon, 19 Jul 1999 09:36:20 -0500
From: Ken <kg0wx@swbell.net>
Subject: here it is: Icom 706mkIIg mod

The standard cya disclaimers apply to the following:

Icom IC706mkIIg mod:

Wide band transmit mod for the IC706mkIIg requires removal of diode
D.2030. Remove top cover to access main board. Locate IC chip
4052C-8713. Looking at the chip and reading the number from left to
right, look just left of the chip to locate 11 solder pads running up
and down. Diode D.2030 was the tenth diode from the top of the solder
pads on (USA Version) radio. Remove diode. This modification opens
up transmit on HF, VHF, and UHF bands. 

Ken Bessler KG0WX