Keithley PIO-12 User Manual page 47

Table 5-1. Troubleshooting Information (cont.)
Symptom
Intermittent
operation
Data appears to be
invalid
Computer does not
boot.
Possible Cause
The most common cause of this
problem is that the I/O bus speed
is in excess of 8 MHz.
Vibrations or loose connections
exist.
The board is overheating.
Electrical noise exists.
The most common cause of this
problem is that the I/O bus speed
is in excess of 8 MHz.
An open connection exists.
Another system resource is using
the specified base address.
Board not seated properly.
The base address setting of the
PIO-12
board conflicts with that
of another system resource.
The power supply of the host
computer is too small to handle
all the system resources.
If your board is not operating properly after using the information in
Table 5-1, continue with the next two sections to further isolate the
problem.
Possible Solution
Reduce I/O bus speed to a maximum of
8MHz (to change the I/O bus speed, run
BIOS setup). See your computer
documentation for instructions on running
BIOS setup.
Cushion source of vibration and tighten
connections.
Check environmental and ambient
temperature. See the documentation for
your computer.
Provide better shielding or reroute
unshielded wiring.
Reduce I/O bus speed to a maximum of
8MHz (to change the I/O bus speed, run
BIOS setup). See the documentation for
your computer for instructions on running
BIOS setup.
Check wiring to screw terminal.
Reconfigure the base address of the
PIO-12
board; refer to "Setting the Base
Address" on page 2-8 for more
information. Check the I/O assignments of
other system resources and reconfigure, if
necessary.
Check the installation of the board.
Check the base address settings of your
system resources; each address must be
unique.
Check the needs of all system resources
and obtain a larger power supply.
5-3