IBM 8237 Installation And User Manual page 93

Table 4-1 (Page 2 of 2). LED Symptom/Fix Table
SYMPTOM
Two or more hubs that are in the same
backplane of a stack have the Prim LED ON.
The Expansion Port LED is OFF, although
power is ON and an Expansion Port is
installed.
The Power LED is OFF.
An 8237 Model 002 or Model 003 does not
have either the Prim or the Bkup LED ON.
An 8237 Model 003, or Model 002 with the
RMON upgrade feature, does not have the
RMON LED ON.
4-2
8237 Hub Installation and Planning Guide
FIX
The physical stack is segmented into more
than one logical stack, with each having one
or more management hubs. Check for loose
or disconnected Stack Link cables. Replace
the hub with the Prim LED ON that is
logically lowest in the stack. To determine
which is logically lowest, you can look at the
hub interconnect cables to see how they are
attached.
• Replace the Expansion Port.
• Replace the 8237.
Verify ac power.
Replace the power supply.
Verify that the hub is correctly connected to
the other hubs in the stack and that it has
power. If no problem is found, replace the
8237.
• Replace the RMON Daughter Board.
• Replace the 8237.