Ethernet Cable - BIOPAC Systems, Inc. MP150 Troubleshooting Manual

Fuse
If the power light is not activated by the power switch and the power supply and connections have been verified, the next
step is to check the fuse. Beneath the power switch on the back of the MP150 is a gray fuse holder (see photos below).
With a small slotted screwdriver, push in on the fuse holder and turn counter-clockwise one quarter of a rotation. This will
disengage the fuse holder causing a spring to push it part way out. Pull the fuse holder the rest of the way out and then
remove the fuse. There is a fine wire running down the center of the fuse. If that wire is visibly broken, or if an ohmmeter
connected to the two end caps of the fuse indicates a high (typically "overload") resistance, then the fuse should be
replaced.
A.
B.
Location of fuse holder; Back of MP150 A. Removed fuse holder Testing fuse with digital multimeter
B. Fuse removed from holder
If the fuse is not burned out and the power light will not come on when it should, then the unit must be sent back to
BIOPAC Systems, Inc. for inspection/repair. Please contact BIOPAC Systems support for an RMA #.
If the power light is on steady and green as it should be, next check the other two status lights. When the unit is turned on,
the Activity and Busy lights should both turn on for a brief period, then the Busy light should turn off and stay off. The
Activity light should flash intermittently. On older models, Activity and Busy lights may flash alternately to indicate that the
device does not detect a network connection. On more recent models, this state is indicated by a double-flashing of the
Activity light. In this state, the Activity light flashes twice, pauses for a couple of seconds and repeats indefinitely.
Check the MP Systems Hardware Guide (available via the "Help" menu in AcqKnowledge) to determine the meanings of
other patterns of the status lights on the MP150. Most of the unusual flashing patterns indicate a problem that will require
the MP150 to be serviced. In that case, contact BIOPAC Systems for an RMA #. If instead the pattern indicates a network
problem, continue reading this troubleshooting guide.

Ethernet Cable

Ethernet Crossover Cable
If the MP150 is connected directly to an ethernet port of the host computer, the two devices form a peer to peer network.
Hence the ethernet cable that connects them should be a crossover cable. The best way to ascertain whether a cable is a
crossover cable is to detach both ends, hold them at the same orientation, and look at the order of the wires within. If the
two ends of the cable look the same, then the cable is a straight-through or patch cable. This type of cable is used for
client-server systems. An MP150 connected to an ethernet switchbox or connected to a port in the wall should use a patch
cable. Direct connection to the host computer should be through a crossover cable such as the one shown in the image
above. Note that the order of the wires visible through the clear plastic housing is different at the two ends.
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