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Troubleshooting Guide
Symptom
1. No visual indicators
illuminated on power supply
and adjacent modules.
2. POWER ON indicator on
power supply illuminated,
but all other visual
indicators on adjacent
modules are not illuminated.
3. No visual indicators
illuminated on isolated
modules.
4. Audible alarm will not
silence.
46
Part No. 6-847681-00 Rev. D
Possible Cause
a. AC power is not turned on.
b. Blown fuse.
c. AC power wiring not
connected.
d. Faulty power supply chassis.
a. Ten-wire ribbon cable loose
or disconnected.
b. Faulty power supply chassis.
a. Display chassis interconnect
cable loose or
disconnected.
b. Ten-wire ribbon cable loose
or disconnected.
c. Faulty display chassis.
a. Faulty digital display module
chassis or faulty multi-signal
alarm module chassis.
b. Faulty power supply chassis.
Corrective Action
a. Check AC power source.
b. Replace fuse.
c. Check AC entrance wiring at power
supply terminals.
d. Replace power supply chassis.
a. Check ten-wire ribbon cable
connections at interconnect boards
and power supply terminal.
b. Replace power supply chassis.
a. Check display chassis interconnect
cable.
b. Check ten-wire ribbon cable
connection at interconnect boards.
c. Replace display chassis.
a. Begin with the module indicating a
visual alarm farthest from power
supply and in turn disconnect
interconnect cables from back of
chassis until audible alarm is
silenced. Replace faulty display
chassis.
b. Turn off AC power. Remove power
supply chassis from mounting box.
Disconnect ten-wire ribbon cable
from alarm connection on power
supply chassis. Reinstall power
supply chassis into mounting box.
Turn on AC power. If audible alarm
persists, replace power supply
chassis.
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