Model:         IC-900                           REVISED 12- 7-89

 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 #:    13889-016

 Date:          May 1, 1989

 Subject:       Occasionally at power up the LOGIC A unit will im-
                properly initialize.  The result is either a
                dashed line or garbled numbers in the frequency
                display.

 Information:   The following modification makes changes in the
                CPU initialization time constants.

 Procedure

  1.  Disassemble the radio unit and locate the main logic board.

  2.  Remove R100 a 100 ohm MCR10 and replace it with a 33K MCR10
      (ICOM P/N 915-04793).

  3.  Remove R103 a 4.7K MCR10 and replace it with a 33K MCR10
      (ICOM P/N 915-04793).

  4.  Reassemble the radio and test.