Pathway DMX Pathfinder CR Manual - Manual (Page 19)

DMX Distribution System Page 19
Operation
1.5 BASIC TROUBLESHOOTING
Basic fault-finding at the system user level is usually confined to observing the state
of LED indicators on the face of the DMXPathfinder modules (refer to Figures 1.5-
1.8). These can be scanned quickly to determine whether any problems exist.
Under normal usage with no source or talkback data present, only the four red
power (PWR) LEDs should be glowing steady on Input and Output Modules, as well
as the processor OK (RUN) red LEDs on all Modules). If a patch file is active in the
DMXPathfinder, SEL (selected) red LEDs will also be illuminated for all input and
output lines used in the patch configuration, and PAT (patch present) LEDs will be
illuminated on modules used by that patch.
When input data is present, the Input Modules' yellow (RxD) LEDs will illuminate on
modules where I/O channels are selected. The corresponding yellow (RxD) LEDs
on the Master Control Module and green (TxD) LEDs on Frame Control Modules
should be illuminated as well. The green (TxD) LEDs on the Output Modules will
also be illuminated where those I/O channels are selected, indicating that data is
being sent.
If talkback (return) data is being received by a selected Output Module circuit, its
corresponding RxD LED will be on, as well as the related Frame Controller and
Master Controller RxD and TxD LEDs. Likewise, a green TxD LED will be
illuminated at the Input Module that is returning the talkback data to the host control
system.
All LED indicators should be on steady in normal use. A flashing RUN LED
indicates processor failure for that module, and any RUN LED that is out indicates
loss of 5VDC power in that module.
Status LEDs are not necessarily a definitive means of establishing whether or not
an output repeater circuit is faulty. They will not tell you if one or both data link fuses
are blown, or if the output line driver is faulty. A quick verification can be done by
using a patch cord to connect the suspect repeater's output to a spare input (ensure
that it is patched - SEL LED on); if that input's RxD LED lights, the output opto-
repeater is functional.