Specifications

2-4. POWER REQUIREMENTS. - The Model 450 requires a power source of 105V-130V
50-60Hz or 210V-250V 50-60Hz. Power consumption is:
Transmitter.................. 28 VA maximum.
Receiver..................... 24 VA maximum.
2-5. LINE VOLTAGE SELECTION.
CAUTION
Before connecting ac power to this equipment, make sure it is set to the line voltage of the
power source. Also ensure that the common connection of the power outlet is connected to
a protective earth contact.
___________
_ WARNING _
___________
Line voltage selection is made at the ac plug-in receptacle on the rear of the shelf (see
Figure 2.1). This should be done by trained service personnel only. To avoid electrical
shock, make sure the power cord is disconnected before changing the voltage selection pc
board. Before connecting this device to the power source, verify that a
protective earth ground connection is provided through the grounding conductor of the
power cord. The protective ground connection through the power cord grounding
conductor is essential for safe operation.
The Model 450 is shipped from the factory with the line voltage selection set for 105-130 Vac. If it
is necessary to change the line voltage selection, access to the voltage selection pc board can be
accomplished by (see Figure 2.1):
1.) Removing the ac cord.
2.) Open the cover door, rotate the fuse-pull to the left, removing the fuse.
3.) Remove the pc board. Select operating voltage by orienting the pc board to
position desired voltage on top-left side. Push board firmly into module
slot.
4.) Rotate fuse-pull back into normal position and re-insert fuse into holder,
using caution to select the proper fuse value.
450 Operation Manual Rev A Page 12 8/26/99