MAINTENANCE/TROUBLESHOOTING
5.2.4 LOCKED LED DOES NOT ILLUMINATE
• Internal oscillator may have to be nulled/calibrated.
• Elevation Mask value may be set too high.
5.2.5 UNIT DOES NOT TRACK STATELLITES, ERROR MESSAGE/CODE – ANT.
UNDERCURRENT
• Antenna/preamp failure.
• Antenna cable open or shorted (center conductor to shield).
5.2.6 COLD RESET
A “COLD RESET” needs to be performed upon the following conditions:
• The unit fails to operate or operates intermittently and it is not a power, tracking, or locked
problem.
Cold Reset Procedure
• Turn off or disconnect AC power.
• While holding down the MENU key of the keyboard, reapply power and observe the LCD
display to read:
COLD RESET DONE, UNIT SET TO DEFAULT
PLEASE RELEASE COLD RESET SWITCH
• Release the MENU key of the keyboard.
• The default values have now been loaded into the unit.
• Each of the above default values needs to be examined and changed/reentered as necessary.
(See Section 4.31). If the unit is left in the default “AUTO” mode, it will find its own
position.
Note: If new software has been installed in the unit, a cold reset will automatically be
performed the first time power is applied. The following message will appear on the
LCD for approximately four seconds:
COLD RESET DONE, UNIT SET TO DEFAULT
Symmetricom Inc ET6xxx ExacTime GPS TC & FG (Rev C) 5-5
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