DECrepeater 900GM Installation and Configuration
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Problem Solving Using the LEDs
When diagnosing a problem with the module, note that the problem is often indicated
by the combined states of the module LEDs. Table 3 lists the states of the LEDs for
various error conditions that can occur during initial installation of the device, along
with probable causes and corrective actions to take.
Normal Powerup
When power to the module is initially turned on, the following events occur:
1. The Power LED lights and remains lit. All other LEDs light and then turn off.
This verifies that the individual LEDs are operational.
2. The module initiates its built-in self-test.
3. After the successful completion of self-test (within 1 minute), the
Module OK
LED lights and remains lit.
4. The remaining LEDs indicate their operational status.
Problem Solving
Table 3 provides a list of symptoms indicated by the LED states along with
suggestions for corrective action.
Table 3
Problem Solving Using the LEDs
Symptom Icon
Probable Cause
Corrective Action
All LEDs
are off.
The module does
not have power.
If installing the module into a
DEChub 900, check the power status on
the Hub Manager status display.
If enough power is available, lift the
release lever, and reseat the module.
If installing the module into a
DEChub ONE, ensure that the locking
L-bracket screw is locked securely.
Remove the module and inspect the mod-
ule’s 48-pin and 160-pin connectors for
bent, broken, or dirty pins.
If any pins are broken or bent, replace the
module.
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