Install two transistors.
Part #UN9110 can be ordered from ICOM Service Department.
This mod is not for the non-technical person. The radio pretty much has to be completely disassembled to get to the pads.
- Remove the control head and battery.
- Remove the 4 back screws and 4 battery compartment screws.
- Separate the case.
- Locate the circuit board with the two channel select/squelch knobs. This is the board we're looking for. Unfortunately, it's an the back.
- CAREFULLY remove the wide ribbon cable that connects the upper and lower circuit boards.
- LOOSEN the three screws an the LOWER circuit board.
- Remove the two screws an the back of the radio, an the top of the battery compartment.
- Remove the three screws an the battery contacts.
- Slide the RF assembly up and it should separate from the rest of the radio.
- Remove the knobs and carefully remove the ring nuts from the case.
- Remove the metal bracket that is between the case and the pots.
- CAREFULLY Desolder the grounding tob an the left side of the circuit board.
- Remove the two screws holding the board down.
- The board should now be free. Carefully wiggle and pull and pry until the board is released. You may have to partially or fully remove the battery spring mechanism.
- Flip the board over. There is a large multi-pin jack an the back, slightly high and centered. Look for two empty, 3 pin pads right next to it.
- Carefully solder the two transistors onto the pads.
- Check your connections. You do NOT want to have to disassemble this twice.
- Check them again.
- Reassemble the radio in reverse order. Remember to resolder the grounding tab.
- Turn it on. Select UHF, key in an 800MHz frequency and listen. There is no need to reset the VFO or memories.
This is a close up view of the area to looking for.
(sorry, no picture yet.)
# = 3 pin part, diode/transistor
|| = 2 pin SMD diode/resistor
(*) = 3 pin surface mounted transistor.
(*) (*) || || # #
# || || || ||
| MULTI-PIN JACK |
== == || ||
(kinda hard to draw in ascii. This diagram needs a non-proportional font to look right...)