Model:         IC-761                             Revised 11-9-89

 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 #:    8988-001

 Date:          March 29, 1988

 Subject:       Poor sensitivity on all bands EXCEPT 14 MHz.

 Information:   On the main PLL Board VCO there is a shield under
                the board.  This shield has a small grounding
                prong that may come in contact with the bottom of
                J4.
 Procedure

  1.  Gain access to the bottom side of the VCO on the PLL Board.

  2.  Re-position the grounding tab (prong) so that it does not
      contact the bottom of J4.

  3.  Reassemble the radio and check sensitivity on all bands.  It
      should be normal.

 Note:     This condition has been noted on some units with serial
           numbers close to 1239.

 Bulletin #:    24287-001A

 Subject:       Larger relay for keying non-ICOM amplifiers

 Procedure

  1.  Replace RL 2 (currently labeled OMR 109) on the PA Connector
      Board with a SY-12 relay (ICOM P/N 921-04696).  This relay
      is larger but can be squeezed into place.  Glue this relay
      to the board with RTV.


 Bulletin #:    24287-002

 Date:          August 29, 1987

 Subject:       Speed up rise time of CW transmit waveform when
                the radio is in the full-break-in mode

 Procedure

  1.  Remove the bottom cover from the radio.

  2.  Remove the main board from the radio.

  3.  Replace R32 (currently 180K) with a 82K 1/8 watt resistor
      (ICOM P/N 915-01123).


 Bulletin #:    24287-003

 Subject:       When the B VFO is being used the LED for the A VFO
                flickers

 Procedure

  1.  Replace the following parts on the Display Board

      Reference      Current        New
      Designation    Value          Value

      C10            .0047 mf       .68 mf
      C11            .0047 mf       .68 mf
      C12            .0047 mf       .68 mf


 Bulletin #:    24287-003A

 Subject:       While receiving a strong signal the receiver may
                oscillate due to AGC time constant delay

 Procedure

  1.  Replace R34 (currently 12K) on the RF Board with a 56K
      resistor.

  2.  Replace C30 (currently .47 mf) on the RF Board with a 2.2 mf
      50V electrolytic capacitor.


 Bulletin #:    24287-004

 Subject:       When using the IC-761 with other manufacturers
                linear amplifiers the ALC may not be controlled
                properly

 Procedure

  1.  Add a 10K resistor on the main board from the base of Q92
      (2SA 1048) to ground.