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Icom 02AT Frequency Modification [message #64] Sun, 25 June 2006 16:41
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Registered: December 2004
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icom 02at mod 140-163 mhz

a. locate a copy of the june 1986 issue of 73 mag.

b. the article on pg. 60 is for models with id numbers lower than 35,000. if yours is one of the newer models like mine..... then follow these changes:

1. read the entire article b-4 doing anything!!!

2. follow steps 1 to 3 on pg. 61 "modify ur 02at" then s t o p ! refer to fig.2 on pg. 60 and remember the diodes on urs are in different locations than in the pix.

3. using a very small flat blade iron and some solder wick remove the the three leg diode d2 notice that the numbering for d1,d2,d3,d4 are off to the left of the actual location of the diodes on the board.

4. resolder d2 down in position d5 try to use the solder on the pads.. only add solder to the pads if absolutely necessary, b-4 you put the diode in place to avoid bridging.

5. solder a store bought 1n914 or 1n4148 diode from the top pad to the bottom left pad of d4. you will need to bend and cut the leads of the diode and pre-tin with solder. bend the leads of the diode so that the body of the diode across the bottom right pad covering it up. the banded end ohe the diode should be facing down towards mhe bottom right pad.

now you are ready to follow steps 7 to 13 and the rest of the instructions in the article. the only difference you will find is that a letter "u" will flash to indicate unlocked instead of the entire display flashing.
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