PL PRO and Encore MS/PS 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 reset 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 Remote Stations to power lines or transformers or RFI
Solution 1: Relocate offending unit / cables
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 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.
Solution 3: Set the Main Station or Power Supply termination switch for that channel to the ON position.
Cause 4: A headset extension cord was used.
Solution 4: Headset extension cords are not recommended.
Problem: Excessive crosstalk
Cause 1: High DC resistance in ground return.
Solution 1: Use heavier cable; add additional conductor(s) to ground return.
Cause 2: MULTI-CHANNEL cable pairs are not individually shielded.
Solution 2: Replace cable with individually shield pairs.
Cause 3: Headset cables are not wired properly or shielded properly.
Solution 3: Correct wiring. Use headsets with properly shielded wiring.
Problem: Program signal sounds distorted.
Cause: Overload of Program Input circuit.
Solution: Reduce Program Input level or reduce the gain of the program signal at the source, such as an audio mixer.
Problem: Call signals do not function.
Cause 1: Excessive DC loading of intercom line.
Solution 1: Remove any audio transformers or other equipment which may be connected across the intercom line. If equipment other than Clear-Com intercom equipment must be connected to the intercom line, please contact Clear-Com application or service personnel for advice.
Cause 2: Far too many terminations on the intercom line.
Solution 2: Check all Main Stations and Power Supplies to make sure each intercom channel is terminated at only one point.