Pathway LR Installers Guide - Manual (Page 14)

DMXPathfinder LR Maintenance & Testing
13
Chapter 2: Maintenance & Testing
C
ARD
R
EPLACEMENT
Should a defective component be found in an Output Module or other
module during troubleshooting, it is best to replace the suspected defective
circuit card with a spare unit and re-test. Powering down the entire
DMXPathfinder, or at least the specific module, is recommended before
removing or inserting cards.
To replace an Output Module card, first remove loosen the four front panel
Phillips screws and the panel, then grasp the card stiffener bracket (or ejector
handles), and pull the card straight out of the module chassis. Carefully align the
replacement circuit board into the chassis' left and right card guides and slide
the unit in until it protrudes about 5mm, then push the module firmly into its
mating backplane receptacles. The card is not fully seated unless its front edge
is flush with the front of the metal chassis.
If the CPU card was replaced, check that the rotary and DIP switches have
been set the same as the replaced card.
Before replacing the front cover, first restore power and depress the
RESET pushbutton on the first Input Module until the system resets (Processor
OK LED goes out). Then re-test the system to ensure that the fault has been
corrected. If the entire rack was powered off, it is unnecessary to press RESET
since a system-wide reset cycle always occurs automatically on power-up.
If you forget to press the RESET pushbutton after module replacement, the
function can be initiated from the DMXQConnect program at the personal
computer.
T
EST
P
ROCEDURES
System testing by maintenance personnel will usually be carried out in
response to a fault that has developed somewhere in the system. Powerful
diagnostic instruments are available to assist maintenance technicians with this
task: the Fluke Model 650 LAN Cable Meter, and Goddard Design Li'l DMX'ter,
amongst others. These will be described in more detail below. In general,
though, the procedures outlined in Chapter 5 and the troubleshooting
instructions in this Chapter are likely to help solve the vast majority of problems
encountered, especially where any system downtime cannot be tolerated.