Installation manual

4 If connected, check that Program Input, Announce Output and Hot Mic Output / IFB System
jacks are functional. Verify the operation of the controls that affect the function of these inputs
and outputs. Refer to the User Manual of the particular Main Station.
TROUBLESHOOTING
Problem: System does not operate. No power to Main Station or Power Supply. Green
POWER LED is not illuminated and no SHORT LED's are illuminated
Cause 1: No AC power to the Main Station or Power Supply.
Solution 1: Make sure the power switch on the rear panel is turned ON. Check AC connection
and cable. Plug into dependable AC source.
Cause 2: Main Station or Power Supply has an internal Power Supply failure.
Solution 2: Unit requires servicing.
Problem
:
Red SHORT LED illuminated
Cause 1: Short or overload on that channel due to a shorted or miswired cable.
Solution 1: Remove cables one at a time from system until the faulty line is located. (The red
Short LED will then turn off.) Check for shorts between pins 1 and 2 or improper
cable wiring. Once the short is removed, the Main Station or Power Supply will re-
set automatically and the power will come back up within several seconds.
Cause 2: Defective Remote Station.
Solution 2: Check Remote Station and replace if necessary.
Problem
:
Both red SHORT LEDs are illuminated
Cause 1: System is overloaded.
Solution 1: Remove cables, one at a time from system to help determine where the excess
current requirements lie. Re-evaluate system current needs.
Cause 2: Short in multipair cable.
Solution 2: Remove 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.
Problem: Hum or buzz in system
Cause 1: Inductive pickup caused by close proximity of this Main Station or connected Re-
mote Stations to power lines or transformers.
Solution 1: Relocate offending unit.
Cause 2: 10 Ohm chassis ground resistor is open.
Solution 2: Check the DC resistance for 10 Ohms between the chassis and pin 1 of any inter-
com connector.
If this condition happens, it is because the system ground came into contact with something
that was "HOT" with respect to the Power Supply earth ground. If this occurs, carefully check
the system ground and AC distribution in the area.
WARNING
: THIS IS A POTENTIALLY DANGEROUS SITUATION. A SHOCK HAZARD
MAY EXIST BETWEEN THE METAL BOOM OF A REMOTE STATION HEADSET AND
GROUND.
Problem: System feedback (Acoustical)
Cause 1: Listen Level control at this station or a Remote Station is set too high.
Solution 1: Adjust.
Cause 2: Sidetone Null control at this station or a Remote Station is not adjusted correctly.
Solution 2: Adjust. Refer to the procedure in the Front Panel Controls section of this manual.
Cause 3: Channel unterminated.
Clear-Com System Installation Manual
18