Service manual

Neurodiagnostic Instruments Service Manual
2 - 16 Revision 2/18/05
Base Unit
The Base Unit contains a majority of the electronics for
the VikingQuest. This includes:
• Isolated power supply
• Stimulus/trigger pulse generator
• Electrical stimulus generator
• Auditory stimulus generator (optional)
• Temperature probe interface (optional)
• EMG speaker
The Base Unit is considered a Least Replaceable Unit
(LRU) and therefore contains no customer serviceable
parts.
The power supplies for the base unit and laptop
computer meet leakage current specifications for
medical devices, therefore no external isolation power
supply is required for portable systems.
Amplifier System
The amplifier options are a 2- or 4-channel amplifier.
The amplifier modules contain the electrode input
connectors and the differential input amplifiers. The
remaining blocks of the amplifier system (the filters and
A/D converter) reside on the Base Unit’s mother board.
There are no headboxes or electrode switching options
for the VikingQuest. The amplifier modules are Least
Replaceable Units and contain no customer serviceable
parts.
VikingQuest Base Unit
VikingQuest 2- and 4-Channel Amplifier Modules