12778474-002-2 Revision F – March 2004
TSG-3800 User’s Guide 121
Maintenance and Troubleshooting
Troubleshooting Charts
The TSG re-establishes the reference phase whenever:
The clock oscillator enters Acquire Mode
The input reference switches
Testing and maintenance of the TSG-3800 can lead to an excessive accumulated
phase offset. The internal oscillator frequency changes in an attempt to minimize
the phase error. Re-establishing a new reference phase offset corrects for this
problem. To do this, use the
PHASE {input} ZERO
command.
Loss of Signal Faults
Loss of signal (LOS) errors report automatically to the EIA-232 ports. A LOS fault
does not necessarily light the LOS indicator. These errors can result from:
No input reference signal (LOS indicator is on)
An intermittent input reference signal (LOS indicator may be on)
Jitter exceeding specification on the input reference signal (LOS indicator off)
Troubleshooting Charts
This section contains troubleshooting charts for individual modules.
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