Icom IC-275H (IC 275 H IC275H) transceiver mods reviews software and diagrams

 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 #:    588-001

 Subject:       If the IC amplifier oscillates when the noise
                blanker is turned on and the FL-83 CW narrow fil-
                ter is installed

1. Remove the covers to gain access to the main circuit board.
   
   
2. Remove R354 (22K) from the main circuit board and replace it with a 10K (ICOM P/N 915-01113) resistor.
   
   
3. Re-install the main circuit board and replace the covers on the radio.