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109

8 COM2000 DIAGNOSTIC CAPABILITIES

When it comes to troubleshooting your COM2000 system, the COM46 card has a few built-in

mechanisms that can assist you. Each of these can be very helpful in diagnosing general issues

associated with system status and card connections that will be covered in the following sections.

8.1 Indicator lights

The nine indicator lights on each COM46 faceplate have multiple functionalities. In addition to

providing a manual toggling ability of the Tuner 9 LED by utilizing the LED controls on the

Tune page (as described in Section 6.2.3), the lights also exhibit a set of predefined behaviors for

several conditions.

In recognizing the behaviors associated with the three indicator lights, you must first familiarize

yourself with the three possible LED states. Table 3 below names and describes them, and

provides a color by which the states will be defined in the following sections.

Table 3 – LED States

The LED emits a steady green light.

Off

The LED is not lit at all.

Flash

The LED exhibits an on-off pattern once a second.

8.1.1 Power Supply Issues

Unless a COM46 card has intentionally been removed from the COM200 chassis, the “PWR”

light on every card in the system should be lit. If none of the COM46 LEDs on a chassis are lit,

the power supply has likely been disrupted. Check for the following:

 The AC cords on each module are completely attached and plugged in.

 Both modules are locked in place.

 The power supply fans are running.

If the above conditions have all been met and you still do not see any LEDs lit, there is probably

an issue with your system. There have been instances observed where a system will experience a

“brown-out”, effectively disabling both power supplies. If this is the case, unplugging the

system and plugging it back in may remedy the situation.

More commonly, you may see unlit LEDs on one or multiple COM46 cards, but not the whole

chassis. Things to check for when this situation occurs:

 All COM46 cards are fully aligned in their grooves.

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Technicolor COM2000 Betreibershandbuch Seite 109