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Troubleshooting Electronics
Use this table if you observe electronic problems.
Problem Probable Cause and Solutions
The system does not
respond to input from
the keypad
1. If your system has a keyboard, check the keyboard to see if
it is working, and ensure that Num Lock is turned off.
2. Disconnect the power cord from the power source.
3. Wait at least 10 seconds, and then connect the power cord
to the power source.
An external device,
LIS, or HIS does not
respond to the system
1. Ensure the port is enabled as described in Configuring for
External Devices in Section 5 and Appendix D, Interfacing
to External Devices.
2. Check the cable connections at both ends.
3. Check the cable for crimps or deterioration.
4. Connect the external device, LIS, or HIS to another port as
described in Configuring for External Devices in Section 5
and Interfacing to External Devices in Appendix D.
5. Perform the external loopback test as described in External
Loopback Test, page 4-75.
6. Check the operation of the external device, LIS, or HIS.
No system power or
screen is blank
1. Ensure the screen is adjusted to the correct viewing angle
and brightness.
2. Ensure the power cord of the 800 system is connected to
the electrical outlet.
3. Ensure the electrical outlet has power.
4. Check the system fuse.