Service manual

Neurodiagnostic Instruments Service Manual
6-20 Revised 2/18/05
Other Data-Related Problems
No patient data displayed
After you have verified that the system power is OFF,
disconnect and reconnect the cabling from the amplifier
to the console base. Disconnect and reconnect all
cabling to the console base and the processor.
Run the USB/FireWire Diagnostics to verify the
amplifier/stimulator modules are recognized and
functioning correctly.
If no trace appears on the display after pressing Switch
and Ave, check the View Input mode to make sure that
the system is simply not rejecting all data due to
excessive artifact or an incorrect sensitivity setting.
Use a different amplifier channel. (Note: Remember to
change channels in the software also.)
Try changing sensitivity and filter settings.
Run a cal pulse using the EMG test mode. Try all
amplifier channels.
Try using a different settings file that is similar to the
file used.
Try using any free running EMG or NCS protocol. If
you do see free running EMG traces, suspect a
stimulator/trigger failure.
If the problem occurs only on a single channel, replace
the electrodes.
Exit the application and shutdown the system, using the
shutdown procedure to reset the parameters.
Run Disk Check to verify the hard disk integrity.
System locks up during data acquisition
If possible, exit the application and reenter your test.
Press Ctrl+Alt+Delete to access the Windows Security
screen. Click on Shutdown. Power down, wait for 30
seconds, then reboot.
A lockup during data acquisition may indicate a
hardware problem with the A/D converter. Run the
USB/FireWire Diagnostics to test that possibility.
Use the Event Viewer to examine the Application Log
for possible software errors.
Verify that you do not have multiple VIASYS
acquisition applications loaded on the same computer.
They may not co-exist well (This should not be a
problem with customer units, only with VIASYS demo
computers that are loaded with multiple product
software packages, for example Bravo + VikingQuest +
VikingSelect.).
From the Disk Manager, run the Disk Check utility.
Static discharge may have occurred. If this is possible,
spray the entire area with static guard.
Try a different test modality. If that modality works,
reload the application software. For the Vikings, reload
the Master software, if necessary.
Is an error message displayed on the screen? If so, refer
to the Error Messages section of this chapter.
Log the events which occurred before the lockup. List
the sequence of button presses, tests performed and
exactly what was done prior to lockup.
Perform a power audit using an Onegraph or other
power monitoring device.
Measure the voltage from the wall outlet.
Amplifier Problems
Launch the USB or FireWire Diagnostics and run the
AutoTest to perform a thorough check of the amplifier
module. If an amplifier is detected, the diagnostic
software generates a calibration signal and
automatically verifies proper signal processing within
the amplifier module, as well as communication
between the amplifier module and the computer.
Run the manual Headbox Test to check signal path
integrity from the headbox inputs to the host computer.
Plugging/Unplugging Amplifiers
The Endeavor CR amplifiers connect to the system
using a USB interface. The VikingSelect amplifier
modules connect to the system using a FireWire
interface
When you plug/unplug one of the above modules with
power applied, there is no danger of physical damage to
the system. However, the application software does not
detect that a module exchange has taken place, and the
software may not operate properly. Therefore, we
recommend powering down the system before
exchanging any modules.
CAUTION
Never disconnect or reconnect the VikingQuest
amplifier or amplifier arm with the system power on.
This practice will damage the amplifiers.