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Chapter 6 Maintaining and Troubleshooting the TimeProvider
Diagnosing the IOC
160 TimeProvider User’s Guide 097-58001-02 Revision G – April 2008
Removing Two IOCs
To remove both IOCs in a shelf, use the following procedure.
1. Save the contents of the Active IOC memory in the IMC by issuing the following
command.
CPY-MEM:::::IOC,IMC,IOC;
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. Issue the following TL1 command to take the Standby IOC out of service:
ED-EQPT::IOCm:::IOCSTATE=OOSRV;
where m is 1 or 2, and corresponds to the location of the Standby IOC (1 is the
left slot and 2 is the right slot).
3. Attach a wrist grounding strap and connect it to the TimeProvider chassis.
4. Loosen the captive retaining screws and pull out on them to unseat the IOC from
the shelf.
5. Place the IOC in a static-free bag or on a static-free surface.
6. Repeat Steps 2, 3, and 4 for the Active IOC.
7. Install new IOCs using the appropriate procedure in Replacing the IOC, on page
160.
Replacing the IOC
This section contains procedures for replacing IOC in three circumstances;
Replacing the only IOC in a shelf
Replacing one of two IOCs in a shelf
Replacing both IOCs in a shelf
Caution: Output signals are turned off when you place the
second IOC out of service.
Warning: To avoid possible electrostatic damage to the IOC,
place it in a static-free bag or on a static-free surface.