12778474-002-2 Revision F – March 2004
TSG-3800 User’s Guide 127
Maintenance and Troubleshooting
Troubleshooting Charts
Troubleshooting AMI and CC Output Modules
The AMI Output module (23478309-000-0) and the Composite Clock Output
module (23477337-000-0) have four LED indicators.
Table 4-8
shows the normal
and fault indications and provides troubleshooting information.
Table 4-8. Troubleshooting the AMI and CC Output 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.
Input FLT A
Off
Amber
No signal or incorrect
signal from FG A
Failure of module’s
input buffers
1.
Check Input Fault A indicator on
other Output modules.
2.
If all Output modules indicate
Input Fault A, check Clock/FG
pair A for faults. Troubleshoot
Clock/FG.
3.
If no other Output modules
indicate Input Fault A, verify all
hardware settings on the
faulted module.
4.
Replace Output module with a
known good spare with the
same configured options.
Input FLT B
Off
Amber
No signal or incorrect
signal from FG B
Failure of module’s
input buffers
Use troubleshooting procedure for
Input FLT A
Output FLT
Off
Red
Output failure of one or
more ports
If both Output modules
indicate a fault, then
the fault is likely due to
a termination problem.
Only 1 of 2 modules in
fault is commonly a
hardware failure.
1.
Replace with a known good
module with the same
configured options.
2.
If replacement does not clear
fault, check for unterminated or
improperly terminated outputs
(shorts and opens).
3.
Check for short on distribution
panel.
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