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