Service manual

Neurodiagnostic Instruments Service Manual
3 - 22 Revision 2/18/05
500VA Isolated Power Supply
The 500VA Isolated Power Supply (Iso Box), provides
isolated AC voltage for Endeavor CR and VikingQuest
desktop systems shipped with the VIASYS Unibody
cart.
There are two versions of this supply:
• 115VAC In / 115VAC Out
• 230VAC In / 230VAC Out
The input/output voltages for this supply are fixed; each
version contains a different toroid transformer.
Field Adjustments/Maintenance
Remove any dust at the ventilation holes, as needed.
The isolated power supply has no field adjustable parts.
Testing/Troubleshooting
Use a digital voltmeter to measure the voltage values at
the output connectors.
800VA Isolated Power Supply
VikingSelect systems sold with a G2 cart use the 800VA
Iso Box shown below.
This supply also provides DC voltages to power
optional VIASYS components, such as the EP/EMG
amplifier/stimulator modules.
The AC input voltage is selectable between 100, 120,
220 and 240VAC. The voltage selector is on the rear
panel of the Iso Box, built into the main On/Off switch
assembly.
A hidden switch selects the AC output voltage. The
settings are 115 or 230VAC. Normally, there will be no
need to change this switch setting, as 120VAC and
220VAC supplies have different part numbers.
An internal circuit board provides three FireWire
communication ports.
NOTE: Notice the difference between this power
supply and the older 800VA power supply -
this supply has a round connector at the
lower right corner of the rear panel to
supply voltage to the STim-Out-Of the Box
(STOOB) modules for the new VikingSelect.
Field Adjustments/Maintenance
Remove any dust at the ventilation holes, as needed.
The isolated power supply has no field adjustable parts.
Testing/Troubleshooting
Use a digital voltmeter to measure voltage values at the
various output connectors. Refer to the 800VA Isolated
Power Supply Data Sheet on the following pages for test
points.
VIASYS 500VA Iso Box
VIASYS 800VA Iso Box