From: kral@larkan.dec.com (Larry NAMP) Subject: IC-32AT Modifications Here are 3 modifcations for the IC-32AT, one was taken directly from an ICOM service bulletin. The following was partly done by NXION. | This is a view of the interior (front side) after | the front of the case has been removed (4 screws / \ in back, 2 screws near PTT switch loosened only). | | +-+ +--+ | | | | | | Carefully disconnect speaker/mike cable from PC +------------------+ board to allow front cover to be fully opened. | TOP | | | NOTE: Battery should be disconnected. Use ESD | | protection (grounded wrist strap, etc.). | | | | | | | | | | | | | | | | | +-+ | | | | | 5 positions on PC board | | | | for diodes (see below for | BOTTOM +-+ | details) +------------------+ | | | | | BATTERY | | | | | +------------------+ This shows diodes as installed at the factory. TOP +--+ +--+ | | | | D907 +--+ +--+ +--+ | /| +--+ | |---|< |---| | D913 Removing this diode results in expanded UHF +--+ | \| +--+ coverage. Approximately 420-460mhz. +--+ +--+ | | | | D908 +--+ +--+ +--+ | /| +--+ | |---|< |---| | D912 Removing this diode results in enabling +--+ | \| +--+ the unit as a cross-band repeater. +--+ +--+ | | | | D??? Installing a diode here (same polarity as others) +--+ +--+ permits keypad entry of 10mhz digit. BOTTOM Icom Service Bulletin #13889-005 The IC-32AT has the capability of being used as a cross-band repeater. This function is not enabled as the unit is shipped from the factory. To enable this function perform the following steps: 1- Cut D912 on LOGIC UNIT. (see above figure) 2- Push and hold the (FUNCTION) switch. 3- Push the (C) key. 4- Push the (6) key. 5- Push the (D) key. 6- Release the (FUNCTION) switch. To cancel "MINI REPEATER" perform the following steps: 1- Push and hold the (FUNCTION) switch. 2- Push the (D) key. 3- Push the (C) key. 4- Release the (FUNCTION) switch. ============================================================================== Here is a modification for the new Handheld Icom xcver IC-32 which will make it to act as a cross band repeater! 1. First take off the battery pack. 2. Remove the 4 screws from radio's back. 3. Remove two screws above and below the PTT and take the whole thing off so the four microswitches are revealed. 4. Take carefully the radio apart by slightly pushing away the front cover. 5. Put the two pieces in front of you with the front part at your left and the back at your right. Be carefull with the ribbon joining the two pieces!!! Orientation is as usual with the place that the battery plugs down and the top of radio (i.e. where the antenna goes) up. 6. Find some pads with diodes in the lower right of the left part (front) of the radio below to the speaker.Take a look in the drawing below: Top of the radio  [[-|>--[[ The number of diodes installed in the top 3 pads [[-|>--[[ depends on the frequency coverage of the rig, maybe [[ [[ two or all three. _ZDDBD @DDAD This is a small diode, by removing it the unit will receive from 300-370 Mhz but this is an untested mod! [[-|>--[[ When you cut this one crossband repeater is enabled! \ [[ \ [[ If you put this diode crossed and have full frequency coverage not only you enable cross band repeater but you can insert the frequency from the keypad starting from second digit (without this mod Bottom of the radio when you wish to insert a frequency in another where battery plugs decade from the one you already are, you have to go there manually). Last but not least to enable cross band repeating first choose a pair of frequencies with the two vfo's for VHF and UHF.Then press and hold function key while pressing with the other hand the following "C" "6" "D". The radio will start scanning the two frequencies continiously, if a station is heard in one of the two it will retransmitted from the other! The two frequencies must be simplex, no cross band repeaters yet sorry! ============================================================================== MODS FOR ICOM 32AT 1. Remove battery and antenna. 2. Loosen two screws on top of unit as much as possible without removing them. 3. Loosen 4 flat head screws on bottom of unit 1 turn. 4. Loosen 2 screws near PTT switch 1 turn. 5. Remove 4 black screws on back of unit. 6. Lift bottom of front cover .25 inch, slide it down .25 inch, then lift front cover up 1 inch. 7. Disconnect plug on 4 wires coming from the speaker. 8. Lay front panel on table up-side down being careful of the flex circuit. 9. All mods are done to the back of the front panel. Notice places for 5 axial diodes, which I will call 1 through 5, 1 being nearest the display. Add/remove diodes so there are diodes in positions 3 and 5. This will open up receive coverage for VHF & UHF and enable keyboard entry of the 10 MHz digit. 10. Notice 4 surface mount resistors slightly left of center directly above the speaker, lined up in a row. Solder the anode (the side without the bar) of two diodes to the right side of the lower of the four caps. Now find the CPU. It's the PGA under the shield near the top of the board. Find the row of pins on the CPU nearest the speaker. Notice the the 8th pin from the right has a thicker trace coming from it. Now notice that there are small solder pads about .25 inch toward the speaker on both the fat trace and the two traces to the right of it. Solder one each of the cathodes of the 2 diodes to the solder pads on the two smaller traces. This will open up the transmit for VHF & UHF. 11. Put unit back together in reverse order. This procedure worked for my unit (and many others), but I can't guarantee it will work for yours. ==============================================================================