IC4GAT

 Model:         IC-4GAT

 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 #:    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.