Cisco D9477-1 Installation And Operation Manual page 92

Chapter 5 Troubleshooting the MQAM
LCD
Description
Reset detected Status The MQAM has been reset by either a
RF (1-4) ASIC
init failure
RF (1-4)
Comm.
Failure
RF (1-4) DC
Lock detect
error.
See also RF (1-
4) UC Lock
detect error.
76
Alarm
Probable Cause
Level
power loss or a manual reset
Major Modulator IC initialization failure. The
modulator MCU could not communicate
with the IC when attempting to initialize
it.
Major The digital I/O board is not able to
communicate with the modulator RF
board MCU at the specified RF OUT
module (1-4). This problem could be
caused by a loose or broken cable or by
the modulator MCU not being
programmed correctly.
Major Modulator Down Converter (DC) lock
detect signal not working. During
modulator MCU Power On Self-Test
(POST), the lock detect signal from the
downconverter PLL did not indicate an
unlocked condition when one existed.
Since the MCU cannot correctly sense
locked vs. unlocked, the RF Output is
muted. The output synthesizer lock detect
circuitry has malfunctioned.
Check and Correct
Session and alarm
provisioning are sent to
the MQAM again
automatically from the
DNCS. However, you
should also check the
following:
Verify that there are

still broadcast services
on this MQAM
Verify that the reset

did not adversely
affect broadcast
services
Run the Doctor Report

to troubleshoot any
network connectivity
issues
Contact Cisco Services

Contact Cisco Services

Contact Cisco Services

Contact Cisco Services

78-717866-01 Rev D