If the PP LED on the module fails to illuminate when the audibles should sound,
short EN+ to EN COM with wire. If a PP LED illuminates (and audibles sound)
when the LSLS output is on, suspect a faulty connection between the audible
module and the I/O card or a faulty controller configuration causing the I/O card to
inhibit the audible module or a faulty I/O card.
If the PP LED on the module still did not illuminate with EN+ shorted to EN COM,
remove all audible connections to the module. If the PP LED on the module now
illuminates when the audibles should sound, check for a short-circuit on one of the
audible connections either inside or outside the cabinet. Reconnect each audible
one at a time to find the faulty one. The module is protected indefinitely against
short-circuits on the output and will not be damaged.
If the PP LED on the module still does not illuminate with EN+ shorted to EN COM
and audible connections removed, then measure the voltage across the “LSLS I/P”
and “LSLS RET” pins of the connector. This should be at lamp supply potential (-
48V DC or -27.5V DC) when the module is being driven. If not, then suspect the
connection between LSLS and the module or the controller configuration or faulty
LSLS output.
If link R40 is cut and the wrong PP LED lights, check whether the LQ+ input is open
circuit or shorted to LQ COM. Open circuit should cause the Loud PP LED to light,
and short circuit should cause the Quiet PP LED to light. If the module functions
correctly (using a local wire link for this test if necessary) then suspect a faulty
connection between the audible module and the I/O card or a faulty controller
configuration causing the I/O card to request the wrong state or a faulty I/O card.
Finally, having shown that the module is getting power from the LSLS output AND
that the Enable input is shorted to enable operation AND that there isn’t a short-
circuit on the audible output AND the loud/quiet input is driven correctly, replace the
Audible Driver module and re-test.
10.2.10 Intermittent Faults/Problem Sites
If a site has an intermittent fault or a fault which keeps repeating then first the
appropriate procedure for the fault should be followed as most paths have more
than one suggested area to check for the fault.
If the fault is still intermittent, do the following:
• Gently - try and move/flex each card whilst in situ to check for any intermittent
connections.
• If any intermittent connections are found, replace appropriate card.
• Gently move cables and wiring looms to check for any intermittent
connections.
• Switch controller ‘off’ and withdraw all cards. Check security of any ICs
mounted in sockets on the CPU Card.
• Re-fit cards and re-check operation of controller.
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