_ DEC-O-LOG for RA9X _ DOL, RA9X-F005, Microcode revision May 92 PROBLEM: All prior releases of microcode do not handle invalid and illegal commands properly. The drive can hang until power cycled. The drive Head off set table is not being utilized properly. Soft positioner errors may result. FIELD EFFECTIVITY: This FCO must be installed on all RA90 and RA92 disk drives. SOLUTION: Install the FCO in all RA9X drives. Revision V27 microcode supports RA90X-F-003 FCO performing a "spin-up Retract" during a drive spin up. QUICK CHECK: The drive microcode is revision V27 or higher. The DEC on-site labor charge will be the time required to install and test the FCO at the then current hourly rate. FCO KIT ORDERING: EQ-01643-01 70-27950-03 RA90/92 M.U.C. FA-04979-01 FCO Document _ DOL, RA9X-O006, Power Supply Aug 92 PROBLEM: RA9X drives will power off within a permanent false power supply over temperature condition. FIELD EFFECTIVITY: All RA90 and RA92 power supplies, H7142 (30-23506-01), from the vendor CEAG at revision "N" or lower. The affected power supplies from the vendor CEAG can be identified without removal, by checking their serial number and revision. Affected power supplies have serial numbers with a plant code of "CG", for example CG03912345 AND a revision of "N" or below. Power supplies from the vendor Zenith have serial numbers with a plant code of "CX" and are NOT affected regardless of revision level. Affected power supplies were predominantly* shipped in the following range of drive and cabinet options: RA90 From KB00008570 to KB00024239 RA92 below KB00005716 SA600 From KB94201536 SA650 below KB11500857 SA800 below KB11500814 * A percentage of affected power supplies will fall outside of these ranges of options due to usage as spare parts, add-on and reconfiguration activity and low volume used by CXO Manufacturing. SOLUTION: Replace older power supply with an alternative or reworked version in EQ kit. QUICK CHECK: Replace only CEAG power supplies at revision level "N" and below. The DEC on-site labor charge will be time required to install and test the FCO at the then current hourly rate. FCO KIT ORDERING EQ-01633-01 30-23506-01 Power Supply FA-04968-01 FA Document