Harris Constellation - Page 169

Harris Corporation Constellation™
Glossary of Alarms 10-9
TROUBLESHOOTING
GUIDELINES
FAN ALARM (A1, A2)
Fan is not operating:
a blown fuse
defective part
If Keypad displays Fan Alarm
but the red LED on the Fan is
not lighted, try replacing the
fuse. If the Fan still does not
operate, the cause may be a
defective Fan.
If Keypad does not display Fan
Alarm, the cause may be a
defective Transmitter.
Note: The Fan alarm is not
reported from the expansion
shelf in a repeater.
FEC LOCK
FEC LOCK A, B
Reed-Solomon FEC decoding is out
of lock in the Modem.
Fault may be receive path, far-
end Transmitter, or far-end
Modem.
FUSE ALARM Blown fuse in Fuse Panel A.
Replace the blown fuse.
Note: The Fuse alarm is not
reported from the expansion
shelf in a repeater.
HLM-1, 2 ABSENT
HLM card unplugged or not installed
per configuration.
Defective HLM.
Is the HLM is plugged in?
If yes, replace the defective
HLM. See Chapter 11.
INPUT LOS (DS3)
INPUT LOS (Tributary
A1-A28, B1-B16)
No signal present at DS3 input.
No signal present at DS1 input.
Check input.
LOCAL CLOCK
On the 3xDS3 unit, one of the three
onboard oscillator has failed.
Replace High Level Mux.
LOCK HLM 1, 2 HLM 1 or 2 is locked on line.
From the Keypad:
CONTROL > LOCK/IF LPBK >
LOCK HLM > CLR
LOCK DEMOD / RX A1, A2
LOCK DEMOD / RX B1, B2
Traffic is locked onto Receiver Assy
An.
Traffic is locked onto Receiver Assy
Bn.
From the Keypad:
CONTROL > LOCK/IF LPBK >
LOCK DMOD/RX > CLR
LOCK MOD / TX A1, A2
LOCK MOD / TX B1, B2
Traffic is locked onto Transmitter
Assembly An.
Traffic is locked onto Transmitter
Assembly Bn.
From the Keypad:
CONTROL > LOCK/IF LPBK >
LOCK MOD/TX > CLR
LOSS OF -12V
Transmitter has failed.
Trouble in the Power Supply.
Replace the Transmitter. See
Chapter 11.
Message Explanation
Course of Action/Possible
Causes