_ DEC-O-LOG for KN220 _ DOL, KN220-O001, DECsystem 5500, Dec 91 KN220-O001 DEC 91 - PROBLEM: Power-up self test writes in one location in NVRAM (Prestoserve). If these self tests are run as a result of a power failure, this location will be corrupted BEFORE the NVRAM data is written back to the disk. There is no indication that data has been corrupted. SOLUTION: Rev D modules to be replaced with Rev F04 modules. Rev E modules to be upgraded with new EPROMS. FIELD EFFECTIVITY: All DECsystem 5500's with Revision D or E M7637-AA CPU modules. QUICK CHECK: Look for M7637-AA revision stamped on handle to be F04 or verify that component E2 on the CPU module to be part number 23-161E8-00. 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-01634-01 M7637-AA module and FA document EQ-01634-02 23-161E8-00, 23-162E8-00 and FA document FA-04969-01 FA document _ DOL, KN220-F002, M7638-AA Module Swap Aug 92 PROBLEM: Self test prints out wrong revision on console. Excessive Q-BUS activity may result in system hangs. SOLUTION: Install M7638-AA revision H04 or higher. FIELD EFFECTIVITY: All DECsystem 5500's with Revision F or earlier M7638-AA I/O modules. All field spares. QUICK CHECK: Component E1 is a 23-163E8-00 or E55 is a 23-074L5-00. 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-01652-01 M7638-AA module rev. H04 or higher FA-04988-01 FA document