Table of Contents
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Troubleshooting
7510-A2-GB20-00
This DSU is designed to provide you with many years of trouble-free service. If a
problem occurs, however, refer to Table 6-2 for possible solutions.
Table 6-2. Troubleshooting (1 of 2)
Symptom
Possible Cause
Alarm LED is on.
One of several alarm
conditions exists. Health
and Status displays the
alarm condition.
Cannot access the
The terminal is not set up
DSU via the ATI.
for the correct rate or data
format, or the DSU is
configured so it prevents
access.
Device Fail appears
The DSU detects an
on the System and
internal hardware failure.
Test Status screen
under Self-Test
results.
An LED is not lit.
LED is burned out.
No power, or the
The power cord is not
LEDs are not lit.
securely plugged into the
wall receptacle and into the
rear panel connection.
The wall receptacle has no
power.
Power supply has failed.
March 1997
Messages and Troubleshooting
Solutions
Refer to
Health and Status
Messages, Table 4-2, for
recommended action.
1. Check the cable and
connections.
2. Set up your terminal or PC
emulation as shown in
Connecting to the Terminal Port
in Chapter 2.
3. Power the DSU on and off and
try again.
Power the DSU off and on and
try again.
Contact your service
representative.
Run the Lamp test. If the LED in
question does not flash with the
other LEDs, then contact your
service representative.
Check that the power cord is
securely attached at both ends.
Check the wall receptacle power
by plugging in some equipment
that is known to be working.
Check the circuit breaker.
Verify that your site is not on an
energy management program.
Replace power supply.
6-3
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Table of Contents
Troubleshooting
