Troubleshooting Guidelines; Indicators, Alarms, And Corrective Action - Symmetricom TSG-3800 Series User Manual

Maintenance and Troubleshooting

Troubleshooting Guidelines

Troubleshooting Guidelines
This section provides guidelines for determining and correcting alarm conditions.
Visible signs of failure are the LED indicators and the EIA-232 error messages.
Table 4-1 lists possible causes for alarms, indicators, and corrective action.
Table 4-1. Indicators, Alarms, and Corrective Action
Indicator Lit Alarm
None Major
CPU Major
HOLDOVER Minor
LOS Major or
Minor
MAJOR/MINOR; Major or
no input fault Minor
indicator lit
NEW REF —
OOF Major or
Minor
OOF and AIS Major or
MInor
POWER Minor
(amber indicator)
RUN (off) Major
SYS Major
116 TSG-3800 User's Guide
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Possible Cause
Module
of Alarm
All No Power
CPU Processor
Failure
Clock Entry into
Holdover
Input Loss of input
signal
CPU MTIE errors
Frequency offset
errors
CPU New reference in
use
Input Out Of Frame
(OOF)
Input Alarm Indication
Signal
CPU Loss of one –48V
supply
CPU Processor
Failure
CPU System Failure
Corrective Action
Check power fuse and feeds
See System and CPU Alarms, on
page 118
Obtain error message over
EIA-232 port
Check input signal; If input signal
is present, replace Input module
See Frequency and MTIE
on page 119
Push ACO button to clear
indicator
Check input signal, jumpers,
Monitor, and Module replacement
Check input signal; If input signal
is correct, replace Input module
Check fuse and feed
Note the LED pattern, then call
Symmetricom Global Services.
Remove and re-install the CPU
module. If ineffective, replace the
CPU module.
See System and CPU Alarms, on
page 118
12778474-002-2 Revision F – March 2004
Errors,