Model: IC -275 Bulletin: B1002 Subject: Prevent PLL unlock at high ambient temperature 1. Change the following parts on the PLL board Original New Part Value Value C101 12 pf 50V CH 6 pf 50V CH R137 35D 45 SN (ICOM P/N 915-04229) R133 22K 15K C191 3 pf 50V 6 pf 50V 2. The thermister should be installed in series with R133. Un- solder one end of R133 and solder R137 in series with it.