4.3
Antenna Gyro and LNB Faults
provides detailed instructions for
authorized service personnel who may be required to replace
the TracVision L2 antenna gyro or the LNB.
4.4
Computer Diagnostics
TracVision L2 has been designed to provide diagnostic readouts
viewed on the TV screen (DIRECTV only) or on a personal
computer having an RS-232 serial communication port. If you are
unable to isolate a system problem with the foregoing
troubleshooting tools, set up for computer diagnostics as
described below. System problems will most likely be found
somewhere through the diagnostic readouts.
The diagnostics procedure requires terminal emulation software
such as PROCOMM or Windows Terminal or Hyperterminal. Use
the settings appropriate to your application.
1. Connect one end of a PC data cable to the
maintenance port connector on the switchplate
(see Figure 4-1). To access this connector, you may
need to remove the switchplate from the mounting
surface.
2. Connect the other end of the PC data cable to the
serial port on the PC (a 9-pin/25-pin connector
adapter may be needed for some PCs).
4-6
A Guide to TracVision L2
Most terminal emulation programs
have a parameter for local
character echo. Select this
parameter to see what is being
typed without any system delay.
Figure 4-2
PC Data Cable DB9 Connector
Maintenance Port
(DB9 Connector)
Figure 4-1
Switchplate Maintenance Port
