Service manual

Revision 2/18/05 5 - 7
System Procedures
Miscellaneous Functions
The Endeavor CR, VikingQuest and VikingSelect
systems contain other VIASYS-unique I/O connectors
and functions required by the applications.
For Endeavor CR, go directly to page 5-9: Endeavor
CR Application Checks to test the miscellaneous
functions.
For VikingQuest and VikingSelect, continue here.
Since the VikingQuest and VikingSelect have different
control panels and somewhat different user interfaces,
the following steps are general in nature. If necessary,
consult your system operator or the system user guides
for assistance in moving through the menus and
changing settings.
LED Goggles
Foot switch
Reflex hammer
Trigger In
Trigger Out
The VikingQuest provides a single Trigger Out
connector; the VikingSelect has two Trigger Out
connectors. The Trigger Out signal is a standard TTL
logic level pulse (0V to +3.5V) with a duration of 100
us.
If your Trigger Out signal is being used to trigger an
external stimulator, such as the Nicolet 2015, the easiest
way to test the signal is to perform a functional test
using the stimulator. You can also measure the Trigger
Out pulse using an oscilloscope.
Step Action
1. Connect the LED Goggles to the system.
2. Enter the EP/VEP test.
3. From the Settings screen, set up the option
for testing Both Eyes.
4. In the waveform screen, switch on the
stimulator. Verify that the Left and Right
LED arrays flash and that all LEDs in each
array light up.
Step Action
1. Connect the foot switch to the system.
2. Enter the NCS/MNC test waveform screen.
3. From the Settings screen, select Recurrent
stimulation.
4. Press the foot switch a few times and verify
that the screen message displayed at the top-
left of the waveform screen, switches
between RUN and STOP. Assure that no
contact bounce occurs.
Step Action
1. Connect a reflex hammer to the system.
2. Enter the NCS/MNC test.
3. From the Settings screen, set the stimulator
type to Reflex Hammer.
4. In the waveform screen, tap the reflex
hammer against your hand. Each tap should
trigger a data sweep.
Step Action
1. Connect a BNC cable to the Trigger In
connector.
2. Enter the NCS/MNC test.
3. From the Settings screen, set the stimulator
type to External Device. The Trigger
Polarity setting is not important for this test.
4. Display the waveform screen. At the free
end of the BNC cable, briefly touch the
ground and active leads together with a
paper clip or another metal object. Each
time you touch the leads together, you
should trigger a data sweep.