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12778474-002-2 Revision F – March 2004
TSG-3800 User’s Guide 123
Maintenance and Troubleshooting
Troubleshooting Charts
Troubleshooting Clock Modules
This section describes troubleshooting procedures for the following modules:
Crystal Stratum 3E (item number 23478272-001-0)
Rubidium Stratum 2E (item number 23478272-004-0)
Crystal Stratum 3E EMI (item number 23478272-011-0)
Rubidium Stratum 2E EMI (item number 23478272-014-0)
Table 4-5
shows the normal and fault indications and provides troubleshooting
information.
Major
Off
Red
Major alarm is present.
Alarm could be on any
module except Outputs.
Output signals are
degraded but present.
1.
Observe alarm indicator(s) on
other modules and troubleshoot
alarmed modules.
2.
Use the Alarm command to
determine the alarm type.
3.
Troubleshoot the alarm
according to the alarm type.
A
B
Net
Green
Green
Green
Indicated Comm port is
active. LED flickers
during data transfer
Status indicator only – no action
required
Note:
1
Troubleshooting system bus failures can be difficult. There is often no alarm indicator on
the affected module(s). Troubleshooting may require systematically removing modules to
isolate the alarm. Output modules are not on the system bus.
Table 4-5. Troubleshooting the Clock Module
Indicator
Indicator Status
Cause
Corrective Action
Normal
Fault
Power
Green
Off
Power failed on either A
or B inputs
DC/DC converter on
module failed
1.
Check Power indicator on other
modules. If they are lit, then
replace this module.
2.
If power is not available to shelf,
check rear panel fuses and
power source.
3.
Replace fuses as necessary.
Table 4-4. Troubleshooting the CPU Module (Continued)
Indicator
Indicator Status
Cause
Corrective Action
Normal
Fault
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