Service manual

Neurodiagnostic Instruments Service Manual
2 - 14 Revision 2/18/05
Stimulators
The Endeavor CR Base Unit directly produces the
electrical current stimulus and visual stimulus (using
LED goggles).
Stimulus timing control of rates, durations, train pulse
count and interval, and electrical stimulus level and
output pair locations are all handled in the electronic
hardware under software control. In addition, two
external trigger outputs along with a trigger input are
available for the control and monitoring of externally
generated stimuli.
Electrical Stimulating System
The electrical stimulus generator resides on the
Endeavor CR Base Unit circuit board. A single
electrical stimulus source is switched to various output
locations to produce the functionality of four
independent electrical stimulus generators.
Stimulus pulses may be presented at repetitive rates or
as single non-recurrent pulses or may be applied as a
train of two or more pulses, depending on the
application.
A rear panel connector on the Base Unit provides the
connection to Stimulus Pod 1. Stimulus Pod 1 connects
to Stimulus Pod 2. The Stimulus Pods distribute selected
stimulus pulses to one of 12 pairs of stimulating
electrodes.
Stimulus Pod 1 also provides a connector for an S402
Stimulus Probe, and a pair of LL connectors for
outputting a Low Level electrical stimulus, which
cannot exceed 10mA intensity level.
Auditory Stimulator
The Endeavor CR Base Unit contains an Auditory
Stimulator daughter board that provides direct outputs
to a transducer. Possible transducers are shielded and
unshielded TDH-39 headphones and TIP 300 Tubal
Inserts.
MC-4 Control Panel
The MC-4 Control Panel provides controls to set
individual stimulus intensity levels for up to four
stimulation sites. There are also a Volume Control knob
and Mute switch for the EMG speaker. The Control
Panel connects to the base unit via a dedicated serial
link.
Visual Stimulators
A rear panel connector provides the link for the LED
Goggles stimulator A separate Trigger Out connector
controls stimulus delivery for the VIASYS 2015 Pattern
Reversal Visual Stimulator.
SP-1 & SP-2 Stimulus Pods
MC-4 Control Panel