Subject: ICOM 706 MKII Extended transmit mod

From: "Len SantaMaria, KC2ADV"






_______________________________________

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:

08. Reconnect the speaker.

09. 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


From: "Rafel" 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




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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


----------------------------------------------------------------

Date: Mon, 19 Jul 1999 09:36:20 -0500

From: Ken 

SOURCE: The QRZ Windows Ham Radio CDROM