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Event Input Voltage Settings
CAUTION!
Use care handling any of the components for static discharge.
1. Set the Line Power switch to OFF position (if so equipped). Disconnect power cord from rear
panel.
2. Remove rack-ears (if so equipped) and remove the top cover using a T-25 driver (4 screws).
3. Disconnect the small antenna cable from the receiver board. Carefully, pull straight out from
the GNSS board connector. Set aside.
4. Remove any connector plugs from input/output connectors at the rear panel.
5. Remove all of the screws to input/output connectors attached at the rear panel of the chassis,
and store for later use.
6. Remove the two screws to the Memory Board, located near the right-front of the chassis, and
lift out the memory module. Grasp across the narrow side of the memory board near the
connector and pull up.
7. Remove the six screws holding the main board and carefully slide it forward to allow for
release of the RJ serial connectors at the right rear of the chassis.
8. Locate the four resistor positions (R225, R226, R227, R228) near the Event Input connectors.
See Figure 14.1.
9. Clean the solder out of the holes for each of the resistors, and install a 511 Ohm resistor (1/4
Watt, carbon composition) in each location.
10. Replace all of the components in the reverse order described above, and restore the unit into
service.
Figure 14.1: Event Input Resistor Settings