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AST RESEARCH, INC.         TECHNICAL BULLETIN # 1004                  10-26-94

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                         MPC MANHATTAN RESETTABLE FUSE


PROBLEM:        During the installation of the Manhattan SMP system, the fuse
                at location J4 may not reset.  As a result, the fuse may fail
                causing the Mylex controller to malfunction.

CAUSE:          Non-resettable fuse.

SYSTEMS
AFFECTED:           AST
                PART NUMBER             DESCRIPTION

                520081-XXX      MP BASE UNIT SINGLE P/S 115V CNFG
                520163-XXX      MP BASE UNIT P54C HIGH MEM CNFG 16MB
                590001-001      SPARE KIT SMP
                FDPS172         BASE UNIT SMP4-50
                FDPS172K1       BASE UNIT SMP4-50
                FDPS173         BASE UNIT SMP4-50
                FDPS173KZ       BASE UNIT SMP4-50
                FDPS175K4       BASE UNIT SMP P/5
                FDP175K5        BASE UNIT SMP P/5
                FDPS177K6       BASE UNIT SMP P/5
                FDPS178K7       BASE UNIT SMP P/5
                FDPS179K8       BASE UNIT SMP 4-50
                FDPS180KO       BASE UNIT SMP 4-50
                FDPS181K1       BASE UNIT SMP 4-50
                FDPS187K7       BASE UNIT SMP P/5
                FDPS192K3       BASE UNIT SMP P/5
                FDPS193K4       BASE UNIT SMP P/5
                FDPS194K5       BASE UNIT SMP P/5
                FDPS195K6       BASE UNIT SMP P/5
                FEAS129         BASE UNIT XP 115V INTR
                FEAS12917       BASE UNIT XP 115V INTR (CNFG)
                FEAS129F2       BASE UNIT XP 115V INTR (OPT)

SOLUTION:       This is an informational bulletin.  The Mylex adapter boards
                (part numbers 202523-001, revision 05 or higher, and
                202523-003, revision 03 or higher) have a resettable fuse.
                If the resettable fuse is triggered, it is reset by powering
                the system off and on.