Model:         IC-475

 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 #:    24487-001

 Subject:       Prevent a decrease in RF power output in high am-
                bient temperatures

 Procedure

  1.  Replace R55 on the RFYGR board (currently 22 ohm 1/8 watt)
      with a 33 ohm 1/8 watt resistor.



 Bulletin #:    29587-001

 Subject:       Prevent PLL unlock at high or low ambient tempera-
                tures

 Procedure

      Write to ICOM's customer service department for a copy of
      this service bulletin.

 Bulletin #:    3888-002

 Date:          February 5, 1988

 Subject:       Self oscillation in transmit

 Procedure

      Write to ICOM's Customer Service department for a copy of
      this service bulletin



 Bulletin #:    6888-001

 Date:          March 8, 1989

 Subject:       Elimination of CPU noise from radio.

 Procedure

      Write to ICOM's Customer Service department for a copy of
      this service bulletin.