Specifications

166119 8/31/2006
33
AC mains power
is OK
Power supply and
processor board
in place
AC fuses OK
AC line fuse is
blown
ALL LEDs on
processor board
are OFF
Sys Status LED
is GREEN
No output to
console terminal
program
Power LED on
processor board
is ON
Sys Status LED
is OFF or stays
YELLOW
Replace Power
supply module
Replace
Processor board
Defective System:
NOTE: Do not
replace fuses -
return system to
factory for repair.
Replace
Processor board
Replace Power
supply module
NORMAL
CONDITION
ABNORMAL
CONDITION
FIRST
ACTION
SECOND ACTION,
IF UNSUCCESSFUL
Figure 12 Basic System Troubleshooting
Once the system is capable of communication with the user via the console terminal port,
problems related to composite and channel port I/O can often be isolated to a single port.
It is important to always check the operating configurations of the Nx8-DualMUX and
attached terminal and communications equipment as a first step in determining the source of
a problem, since compatibility errors are easy to create by incorrectly entering parameters or
placing strapping options.
Often cables may be quickly checked by swapping with known good ports of identical
configuration and testing for similar behavior.
Should a problem be suspected to exist in the port hardware of the Nx64-DualMUX, it is
reasonable that the user would replace the card in question, either the port I/O card for a
channel port, or the processor card for the composite port, in an attempt to resolve the
problem.
When replacing cards in the system, the user should always try to replace the suspected card
or module with one that is known to be in working order.