Welch Allyn Connex Service Manual page 39

Service manual
Communication
Symptom
Cannot communicate through the
USB client connection
USB accessories do not
communicate with the monitor
The device does not communicate
via Ethernet with the computer
network
Possible cause
The battery charge is low
The communications board does not receive
power
The USB client is defective
The accessory is defective
The communications board is not receiving power Check the voltage from J49 on
One or more USB host connections are defective Test the connection with a USB
A USB connection from the communications
board to the main board is faulty
The device is not configured properly
The communications board is not receiving power Check the voltage from J49 on
The Ethernet connection from the main board is
faulty
Troubleshooting 35
Suggested action
Connect the device to AC power
and allow the battery to fully
charge.
Check the voltage from J49 on
the main board for +5.0, ±0.5V
DC. Replace the main board if
necessary.
Test the connection by
connecting a PC running the
service tool. Verify that the
service tool is configured
properly on the PC to
communicate with the device.
See the service tool help files.
Replace the power cable to the
communications board.
Replace with a known good
accessory.
the main board for +5.0, ±0.5V
DC. Replace the main board if
necessary.
thumb drive. If no power or
enumeration is present, such as
an LED on a thumb drive, replace
the communications board.
Verify that the USB cables are
connected correctly.
Replace the USB cables.
Check the settings with your
network administrator.
the main board for +5.0, ±0.5V
DC. Replace the main board if
necessary.
Test the internal Ethernet cable.
Replace if necessary.
Verify that the shim is installed,
if required, on the Ethernet cable
connector at J11. See the
reassembly notes for the main
board.