Chapter 5 - Troubleshooting and Diagnostics HCD-E1
Installation & Operation Manual
5-34 Troubleshooting 01/01/01 08:15
5.6 Power-Up Self-Test
HCD-E1 performs a power-up self-test upon turn-on. The self-test sequence,
described in Section 3-5, tests the critical circuit functions and the display.
In case of failure, HCD-E1 displays an appropriate message in the second
row.
5.7 Troubleshooting
In case a problem occurs, check the displayed alarm messages and refer to
Table 5-1 and the entire Section 5-2 for their interpretation. If the trouble
cannot be corrected by performing the actions listed in Table 5-1, use
Table 5-6 to identify the trouble symptoms. Perform the actions listed under
“Corrective Measures” in the order given in the table, until the problem is
corrected.
Table 5-6 Troubleshooting Chart
No. Trouble Symptoms Probable Cause Corrective Measures
1 HCD-E1 is “dead”. No power Check that both ends of the power cable are
properly connected, and that the POWER switch is
ON.
If HCD-E1 is powered from DC, check the polarity of
the power connections.
Blown fuse
(AC version only)
Disconnect power cable from both ends and replace
the fuse with another fuse of proper rating.
Defective HCD-E1 Replace HCD-E1.
2 One or both HDSL
LOS LINE indicators
light
External problem Check that the remote unit and H-RPT (if there is
one) are operating.
Check for proper connection of the pairs connecting
between the local and the remote units.
Check the loop resistance of the pairs and make sure
the resistance does not exceed the design values.
You may also use a transmission measurement set to
check that loop attenuation is within the allowed
limits.
Defective HCD-E1 Perform a power-up self-test and replace HCD-E1 if
it fails the test.