Troubleshooting Tips - Clear-Com ENCORE MS-702 Instruction Manual

TROUBLESHOOTING TIPS

SYMPTOM
System does not operate. Blue
talk buttons do not illuminate
and short lights do not
illuminate.
System does not operate when
power switch is turned on. Blue
talk lights and red short lights
wink.
Red short light is illuminated.
Both red short lights are
illuminated.
Problem: Hum or buzz in
system.
3 - 2
CAUSE
No AC power to the MS-702.
The MS-702 has an internal power
supply failure.
Direct short on the intercom channel
indicated by the red short light.
Short or overload on that channel due
to a shorted or miswired cable.
Defective remote station.
System is overloaded.
Short in multipair cable.
Inductive pickup caused by close
proximity of this main station or
connected remote stations to power
lines or transformers.
SOLUTION
Make sure the power switch on the
rear panel is turned on. Check the AC
connection and cable. Plug into a
dependable AC source.
Unit requires servicing.
Remove the intercom line cables one
at a time from that channel until the
faulty line is located. Once the short is
removed, the MS-702 will reset
automatically and power will come
back up. Check for shorts between
pins #1 and #2 or improper cable
wiring.
Remove the intercom line cables one
at a time from the system until the
faulty line is located. (The red short
light will then turn off.) Check for
shorts between pins #1 and #2 or
improper cable wiring. Once the short
is removed, the MS-702 will reset
automatically and power will come
back up.
Check the remote station and replace
if necessary.
Remove the intercom line cables one
at a time from the system to help
determine where the excess current
requirements lie. Re-evaluate the
system current needs.
Remove the intercom line cables one
at a time from system until the faulty
line is located. Check for shorts
between pins #1 and #2 or improper
cable wiring.
Relocate the offending unit.
M S - 7 0 2 T W O - C H A N N E L M A I N S T A T I O N