Specifications

2-12 Receivers 4000326 Rev A
Troubleshoot Alarm Conditions,
Continued
Troubleshooting Receiver Alarms
The following table shows the possible causes of receiver alarms and their solutions.
Alarm Condition Status Possible Causes Possible Solutions
OK No alarms. No action required.
One or more power supply
voltages are out of specification.
Refer to
Troubleshooting
Power Supply Alarms
later in this section.
Software Self Test
FAIL
Optical input level is out of
specification.
Verify the input power
level is within
specification.
Optical power level at the input of
the receiver is out of specification.
Verify the input power
level is within
specification.
Received Optical
power
High or Low
The nominal and/or threshold
values are not set properly.
Verify that the nominal
and threshold values
are set correctly.
Hybrid Current Draw High or Low Hybrid failure.
Contact Scientific-
Atlanta for hybrid
replacement.
For instructions, refer
to Chapter 6, Customer
Information.
Module Temperature Mtemp High
Ambient temperature is too high
due to:
• A failure in the temperature
control system.
• Airflow through the rack has
been restricted or cut off.
• Prisma chassis cooling fans
are not operating properly.
Diagnose the problem
and repair or replace as
needed.
Ensure the airflow
system has not been
damaged or removed.
Repair or replace as
needed.
Refer to the Prisma
Model 6470-R2 Chassis
Installation and
Operation Guide, part
number 570107, to
troubleshoot the
chassis cooling fans.
Continued on next page