MAINTENANCE
Troubleshooting Tips
Problem:
System does not operate. No power to the PS-232. Green POWER light is
not illuminated and no OVERLOAD lights are illuminated
Cause 1:
No AC power to the PS-232.
Solution 1:
Check AC connection and cable. Plug into dependable AC source.
Cause 2:
PS-232 has an internal power supply failure.
Solution 2:
Unit requires servicing.
Problem
:
Red Overload Light 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. Check for
shorts between pins 1 and 2. Once the short is removed, the PS-232 will reset
automatically and the power will come back up within several seconds, depending
upon how long the short has been present.
Cause 2:
Defective remote station.
Solution 2:
Check remote station and replace if necessary.
Problem
:
Both red Overload Lights 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.
Problem:
Hum or buzz in system
Cause 1:
Inductive pickup caused by close proximity of main or remote 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
intercom 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 be-
tween the metal boom of a remote station headset and ground.
Problem:
System feedback (Acoustical)
Cause 1:
Volume control at the remote station is set too high.
Solution 1:
Adjust.
Cause 2:
Channel unterminated.
Solution 2:
Set the PS-232 temination switch for that channel to the ON position.
Cause 3:
A headset extension cord was used.
Solution 3:
Headset extension cords are not recommended.
Problem:
440 Hz tone is present on either or both channels
Cause 1:
Test tone feature is on.
Solution 1:
Set the test tone switch to the OFF positon.
Problem:
Excessive crosstalk
Clear-Com PS-232 Power Supply
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