Integrator's Manual

108
“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 COM24 cards, but not the whole
chassis. Things to check for when this situation occurs:
 All COM24 cards are fully aligned in their grooves.
 All COM24 cards are properly connected to their receivers on the back panel.
 All thumbscrews are tightened completely.
If any COM24 cards remain unlit after ensuring that all of these conditions have been met, there
may be something wrong with the cards.
8.1.2 System Startup
It is important to understand the behaviors associated with the execution of normal procedures
before you can effectively diagnose any card issues. This section covers the sequence of events
that occur in a COM1000 system at boot-up.
The COM24 card goes through four steps at startup:
1. Self test
2. IP Initialization (obtain IP address, establish network connectivity)
3. DIRECTV Program Guide acquisition
4. Channel acquisition and video streaming
The COM24 cards take between 2 and 3 minutes to reach a fully functional state after a reboot or
power-up. The status of the card can be tracked during this time by observing the behavior of
the LEDs. Normal LED behavior during startup is listed below in Table 4.
Table 4 – LED Startup Behavior
Condition
Tuner 1
LED
Tuner 2
LED
PWR LED
Approx.
duration
Self-test and initialization
ON
OFF
OFF
30 sec
Searching for guide data
ON
OFF
SLOW FLASH
120 sec
Normal operating conditions
ON
ON
ON
Note: It is normal for the Tuner LEDs to turn on and off during boot-up.