Mvme2603/2604 Vmemodule - Motorola MVME2603-1121A Installation And Use Manual

System Considerations
1

MVME2603/2604 VMEmodule

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The MVME2603/2604 VMEmodule furnishes +12Vdc and (in
MVME761 I/O mode) Ð12Vdc power to the transition module
through polyswitches (resettable fuses) R34 and R28 respectively.
These voltage sources power the serial port drivers and any LAN
transceivers connected to the transition module. Fused +5Vdc
power is supplied to the base boardÕs keyboard and mouse
connectors through polyswitch R30 and to the 14-pin combined
LED-mezzanine/remote-reset connector, J1. The
the MVME2603/2604 front panel illuminates when all three
voltages are available.
In MVME712M I/O mode, the MVME2603/2604 supplies SCSI
terminator power through a 1A fuse (F1) located on the P2 adapter
board. If the fuse is blown, the SCSI device(s) may function
erratically or not at all. With the P2 adapter board cabled to a
transition module and with an SCSI bus connected to the transition
module, the green
SCSI
terminator power is available. If the
module flickers during SCSI bus operation, check fuse F1 on the P2
adapter board.
Note Because any device on the SCSI bus can provide the
signal, and because the MVME2603/2604
TERMPWR
LED monitors the status of several voltages, the
FUS
LED does not directly indicate the condition of any
single fuse. If the
all the fuses (polyswitches).
In MVME761 I/O mode, the MVME2603/2604 supplies SCSI
terminator power through a polyswitch (resettable fuse) located on
the P2 adapter board.
LED on the module illuminates when SCSI
LED on the transition
SCSI
LED flickers or goes out, check
FUS
LED (DS5) on
FUS