Installation guide

Controls and Indicators 6-7
Table 6-6 Self-Test LEDs Indicating Defective DC-to-DC
Converter
Each module on the LSB has an on-board DC-to-DC converter. If the con-
verter on one module is defective, the 2V reference voltage is disabled for
all nodes, preventing any node from using the LSB. Table 6-6 indicates
which module has the defective converter based on the state of the STP
LEDs of all modules in the LSB.
Use Table 6-6 when the Fault light on the control panel is on (see Section
6.1) and the console prompt is displayed but the self-test map is not. This
indicates that the LSB is good, but access to the bus is not possible.
Processor
Modules
Memory
Modules IOP Module
Defective Con
-
verter on This
Module
One module’s
STP LED is off;
all others are
on.
All STP LEDs
are on.
STP LED is off. Processor mod-
ule with STP
LED off
All STP LEDs
are on.
One module’s
STP LED is off;
all others are
on.
STP LED is off. Memory module
with STP LED
off
All STP LEDs
are on.
All STP LEDs
are on.
STP LED is off. IOP module