Model:         IC-2GAT

 Division:      Amateur

 Note:          This service bulletin is meant for technical per-
                sonnel with experience working on solid state com-
                munications equipment.  Damage caused by im-
                properly installing this modification may cause
                ICOM to charge for subsequent repairs to the
                product.  ICOM does not warrant this modification.

 Bulletin #:    14488-001

 Date:          May 23, 1988

 Subject:       If a noise is transmitted when the CTCSS tone is
                used.

 Procedure

  1.  Remove the 4 screws from the back of the radio.  Remove the
      4 screws from the battery plate on the bottom of the radio.
      Remove the 2 screws on the side of the radio near the PTT
      switch.

  2.  Remove the covers from the radio.

  3.  Unplug the speaker and DTMF pad connector from the main
      board.

  4.  Remove the screws that hold the main board onto the stan-
      doffs inside the radio.  Remove the main board from the
      radio and also the shield that is underneath it.

  5.  Remove the antenna connector from the radio.

  6.  Remove the screw on the main body of the radio on the left
      hand side.  This will release the PA brick from the side of
      the radio.

  7.  Remove the 4 standoffs and any screws that are holding the
      PLL RF board to the main chassis of the radio.

  8.  Remove the PLL RF board from the radio.

  9.  Replace R46 and R47 on the RF board.

                Original            New                 ICOM
      Part      Value               Value               P/N

      R46       10K chip resistor   100K chip resistor  915-01270
      R47       47K chip resistor   470K chip resistor  915-04920

 10.  Reassemble the radio.


 Bulletin #:    00389-001

 Date:          January 3, 1989

 Subject:       When servicing the radio, the technician may cause
                failure of the +5 V source by improperly replacing
                crystal X-3.  We have seen cases of this occur-
                ring.

 Information:   When replacing reference crystal X-3, the physical
                location of the crystal is critical due to close
                spacing of coil L-17.

 Procedure

  1.  Make sure the leads of X-3 are insulated with tubing to
      prevent shorting.  If a short does happen the VCO buffer
      signal will be shorted to ground and cause PLL unlock.

  2.  It is suggested that the body of the crystal as well as the
      leads be insulated to prevent contact with L-17 in the VCO
      circuit.

  3.  Do not trim the leads of the replacement crystal as all of
      the supplied length is required.


 Bulletin #:    13889-006