Troubleshooting The Cpu Module - Symmetricom TSG-3800 Series User Manual

Maintenance and Troubleshooting
Troubleshooting Charts

Troubleshooting the CPU Module

The CPU module (item number 23478301-001-0) has nine LED indicators.
4-4 shows the normal and fault indications and provides troubleshooting
information.
Table 4-4. Troubleshooting the CPU Module
Indicator Status
Indicator
Normal
Run Green
Minor Off
Power Green
CPU Off
SYS Off
122 TSG-3800 User's Guide
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Cause
Fault
Off CPU microprocessor/
software shut down
Amber Minor alarm is present
Off Power failed on either A
or B inputs
DC/DC converter on
module failed
Red CPU hardware failure.
Major indicator is also
red
Red System bus failure. A
bus driver chip has
failed on one or more of
the modules. Major
indicator is also red
Corrective Action
1. Microprocessor failure. Replace
the CPU module.
2. Rebooting the CPU may
resolve the problem, but is
usually only a temporary fix.
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.
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.
1. Issue the Restart command to
re-initialize the CPU. Restart
forces clocks into Holdover.
2. If alarm persists, replace CPU
module.
1. Alarm is a system bus failure -
Escalate.
2. Issue the Status command to
verify that all modules are
listed; missing module(s) are
likely to contain a failed bus
1
driver chip.
12778474-002-2 Revision F – March 2004
Table