CHAPTER FIVE
5.2 TROUBLESHOOTING
5.2.1 GENERAL
If at any time the unit fails to operate or operates intermittently, it is a good idea to remove the
top cover and look for any visible problems or damage. Make sure all cables are securely
connected. Insure all integrated circuits are mounted into their sockets where applicable. Look
for damaged components.
Because the design of the unit utilizes LSI (Large Scale Integrated) circuits, and is
microprocessor based, much of the operation is controlled by firmware/software. There are few
user serviceable components. If severe problems are encountered, consult the factory.
Note: When servicing the power supply, disconnect the AC power from the unit.
5.2.2 POWER LED WILL NOT ILLUMINATE WHEN ON/OFF SWITCH IS
ACTIVATED
DC voltage is not present on J21 input connector pins on Assembly 100015.
Table 5-1
J21 Input Connector Pins
J21 pin 1 Ground.
J21 pin 2 -12 volts.
J21 pin 3 +12 volts.
J21 pin 4 +5 volts.
• Check the fuses in the power entry module.
• Check power wiring connections.
5.2.3 TRACKING LED DOES NOT ILLUMINATE
• Antenna/preamp is defective.
• Cable or connections between the antenna/preamp and the unit are open or intermittent.
• OnCore GPS Module (55182) is defective.
5-4 ET6xxx ExacTime GPS TC & FG (Rev C) Symmetricom Inc
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