Symmetricom 1000, 1100 manual Interpreting Error Messages, Replacing the IMC or IMC/TPIU

Chapter 6 Maintaining and Troubleshooting the TimeProvider

Diagnosing the IMC

Table 6-3. LED Conditions for the IMC and IMC/TPIU (Continued)

LED Name	Condition	Description
Major	Red	Major system alarm
	Off	No alarm
Minor	Yellow	Minor system alarm
	Off	No alarm
Alarm Cutoff (ACO)	Green	On
	Off	Off
Antenna Power	Green	Internal TPIU is communicating with Antenna
(IMC/TPIU only)	Red	Internal TPIU has lost communication with Antenna
	Off	GPS is disabled
Antenna Signal	Green	Antenna is communicating with the internal TPIU
(IMC/TPIU only)	Red	Master shelf is powering up
	Off	Antenna has lost communication with the internal TPIU

Interpreting Error Messages

Error messages appear on the console as they occur, and include the time and date of occurrence. Refer to the event codes described in Table 6-5and to the alarm codes described in Table 6-7.

Replacing the IMC or IMC/TPIU

You can remove the IMC or the IMC/TPIU from the shelf and replace it without affecting outputs.

1.Save the contents of the IMC memory in an IOC by issuing the following command:

CPY-MEM:::::IMC,IOC,IMC;

This command may take more than two seconds to execute; if it does, then the In-Process response is issued. See the TimeProvider TL1 Reference Guide for more information on the CPY-MEM command.

2.Attach a wrist grounding strap and connect it to the TimeProvider chassis.

3.Remove the IMC by loosening the captive screws and pulling the IMC from the shelf using the U-shaped handles.

Warning: To avoid possible electrostatic damage to the IMC, place it in a static-free bag or on a static-free surface.

097-58001-02 Revision G – April 2008 TimeProvider User’s Guide 163