Hi Joe, Had similar problems with my 2 TS930s. Took out the 12v fan & replaced with a 240vac fan across the main transformer primary. Power supply now runs cooler too. 73 de Mike, zl1mh. -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.1.409 / Virus Database: 268.13.32/523 - Release Date: 7/11/2006