Maintenance and Troubleshooting
Troubleshooting Charts
124
TSG-3800 User’s Guide
12778474-002-2 Revision F – March 2004
Locked
Green
Normal operating
condition. Off in
Warm-up, Acquire, or
Holdover modes
Status indicator only. No action
required
Selected
Green
Module is selected to
generate signal to
paired Frame
Generator module as
the source for output
signals
Status indicator only. No action
required
Only one Clock module is selected
at a time
EXT Ref
Off
Not used
No action needed
Holdover
Off
Amber
1.
Module is in
Warm-up mode.
2.
No valid input is
available.
This should be
regarded as a Major
fault condition.
1.
Use the Clock command to
verify status. No action required
if module is in Warm-up mode
for under 30 minutes.
2.
Check Input module alarm
indicators.
3.
Use Status or Alarm command
to verify input-related faults.
4.
Troubleshoot the alarm
according to the alarm type.
End of
Range
Off
Amber
Tuning range is <25%
or >75%.
1.
Input reference
may be pulling
oscillator to end of
range.
2.
Clock module
failure
1.
Use the Alarm command to
determine the alarm type. It
may be helpful to view the
Event History to isolate the fault
condition.
2.
Troubleshoot the alarm
according to the alarm type.
3.
Use the Restart command to
re-initialize the CPU module.
Restart forces clocks into
Holdover.
4.
If problem persists, replace
module.
Acquire
Off
Amber
Indicator is Amber
when locking to the
input reference signal.
Indicator is Off in the
normal operating
condition
Status indicator only. No action
required
ST2 clock should recover from
holdover in <1000 s (16.6 min)
ST3E clock should recover from
holdover in <700 s (11.6 min)
Table 4-5. Troubleshooting the Clock Module (Continued)
Indicator
Indicator Status
Cause
Corrective Action
Normal
Fault
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