Oracle Vacuum Cleaner CPU-56T User Manual

A typical VMEbus system is highly sophisticated. This chapter can be taken as an error
list for detecting erroneous system configurations and strange behaviors. It cannot replace
a serious and sophisticated presales and postsales support during application
development.

If it is not possible to fix a problem with the help of this chapter, contact your local sales
representative or Field Application Engineer (FAE) for further support.

Problem

Possible Reason

Solution

Board does not work

The 5V backplane voltage is
too low.

Check that all backplane
voltages are within their
specific ranges.
Check that power supply is
capable to drive the
respective loads.

Board does not work

a

(LED1 is OFF and LED3 shines weak
red)

The 12V backplane voltage is
missing or too low.

Check that all backplane
voltages are within their
specific ranges.
Check that the power supply
is capable to drive the
respective loads.

Board does not start
(LED1 blinks green and LED3 is
OFF)

No OpenBoot code was
found.

Insert a valid PLCC
OpenBoot PROM and set
switch 1−2 to OFF.

a

If you are sure to have a valid
OpenBoot code in the flash
memory, set the switch 1−2 to
ON.

VME transfers have failures

a

There are no or more than
one board in the VME system
configured as slot 1.

Check all boards for their slot
1 configuration. Only one
board must be configured as
slot 1. Set switch SW4−1 of
the board to OFF for an
automatic slot 1 detection.

VME connectors defect

Check VME P1 and P2
connectors for bent or broken
pins. Adjust bend pins, if
possible, or replace board.

VMEbus timeout too short

a

Increase the timeout of the
Bus Timer. The VMEbus
handles abnormal bus cycles
by asserting the BERR signal.
The timeout should be longer
than the longest expected bus
cycle.