Specifications

5
Troubleshooting and Repair
78
Symptoms and recommended actions
Table 18listspossibletroubleshootingscenarios.Lookthroughthelistedsymptomstoseeif
anyapplytoyoursituationandfollowtherecommendedactionsfortheapplicable
symptoms.Whenanactionrevealsthecauseoftheproblem,resolvetheproblemas
indicated.

Table 18. Troubleshooting actions based on symptoms
Symptom Recommendation
The power LED on the CPM is not lit. • Make sure the CPM is completely inserted and the hot swap latch is engaged.
• Verify that other modules in the shelf are powered. If not, check the power to the shelf.
• Inspect the rear connectors for damage. If they show no sign of damage, try the following:
• carefully insert the CPM into a different slot
• carefully insert a different CPM in the original slot
WARNING!DonotforcetheinsertionoftheCPM.Ifinsertionisnoteasy,the
pinsonthebackplaneconnectormightbedamaged,whichcouldpotentially
damagetherearconnectorsontheCPM.
• Verify the CPM is in the M4 hot swap state (active state). (See the Shelf Management Software Ref-
erence for more information on hot swap states.)
• Check to see if the software installed on the CPM is communicating with the platform’s Shelf Man-
ager or whether the CPM is waiting for an external Shelf Manager to enable it.
The CPM or another module
overheats.
• Verify that a generic front panel is not installed in the shelf. Instead, empty slots must have air man-
agement filler panels designed for the shelf’s slots installed to properly maintain airflow and emis-
sions.
• Check temperatures at the air intake on the overheating module and at the platform’s air exhaust.
Use the information to determine whether the overheating might be caused by warm facility air, a
module failure, or a failed fan module. If the Radisys Shelf Manager is used, see the troubleshooting
information in the Shelf Management Software Reference for details on how to perform these que-
ries.
• Try moving the module to a different slot to see if that resolves the overheating.
• Verify there is clearance of at least two inches between the side of the shelf and the side of the rack
cabinet.
• Check the shelf’s air filter for obstructions and dirt.
Sensors generate alarms or events See the troubleshooting suggestions under Sensor alarm troubleshooting on page 79.
The CPM does not work correctly. Check the Shelf Manager’s system event log for significant events related to the CPM. In particular,
verify that the CPM worked correctly when it was installed, and look for any events since then that
would explain the changes. If the log information does not reveal useful events, remove the CPM and
install it in a different slot. If possible, install another CPM of the same kind in the original slot to help
determine whether the CPM is defective.
Intermittently, the CPM experiences
random data errors.
Verify that the platform’s frame-ground connection is properly connected to a high-quality earth-ground
connection. Check for electrical noise at the backplane power connections and at the power entry
module power inputs. Consider the possibility of a malfunctioning CPM causing electrical noise on
backplane connections.