Polyswitches (Resettable Fuses); Mvme1600-001 Base Board; Table 3-3. Fuse Assignments By Base Board - Motorola MVME1603 Installation And Use Manual

Block Diagram

Polyswitches (Resettable Fuses)

3

MVME1600-001 Base Board

3-22
The MVME1600-001 and MVME1600-011 base boards draw fused
+5Vdc, +12Vdc, and –12Vdc power from the VMEbus backplane through
connectors P1 and P2. The 3.3Vdc power (used by the ISA Super I/O
device on the base board, and by the PM603 or PM604 processor/memory
mezzanine) is derived on-board from the +5Vdc. The following table lists
the fuses with the voltages they protect on the respective base boards.

Table 3-3. Fuse Assignments by Base Board

Fuse
F1
F2
F3
F4
The MVME1600-001 base board furnishes +12Vdc, –12Vdc, and +5Vdc
power to the MVME760 transition module through polyswitches
(resettable fuses) F4, F2, and F3. The MVME760 uses these voltage
sources to power the serial port drivers and any LAN transceivers
connected to the transition module. The
MVME1600-001 front panel illuminates when all three voltages are
available.
The fused +5Vdc power is also supplied to the base board's keyboard and
mouse connectors and to the 14-pin combined LED-mezzanine/remote-
reset connector, J1.
In addition, the MVME1600-001 base board provides +5Vdc to the SCSI
bus signal through fuse F1, located near the front panel SCSI
TERMPWR
connector. The LED (DS5) on the front panel monitors the SCSI bus
FUS
signal along with the other operating voltages; when the
TERMPWR
MVME1600-001 is connected to an SCSI bus, either directly or via the
MVME760 module, SCSI terminator power helps illuminate the
LED.
MVME1600-001 MVME1600-011
+5Vdc (SCSI) +5Vdc
–12Vdc +12Vdc
+5Vdc
+12Vdc
LED (DS5) on the
FUS
FUS