TELIKOU
MS-800T Eight Channel Main Station
9
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 section of this manual.
Cause 3: Channel un-terminated.
Solution 3: Set the MS-800T termination switch to the ON position.
Cause 3: A headset cord is too long or jointing quality.
Solution 3: Check headset cord
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: Headset cables are not wired properly or shielded properly.
Solution 2: Correct wiring. Use headsets with properly shielded 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.
Solution 1: Relocate the offending unit.
Cause 2: Intercom line cable is not wired properly; the shield of microphone cable is not connected
to Pin-1 of 3-XLR
Solution 2: Check intercom line cable. Make sure all the cables’ Pin-1 of 3-XLR connects correct.
Cause 3: 10 Ohm chassis ground resistor is open.
Solution 3: Bridge a 10 Ohm resistor between system ground (G) and earth ground (
) of any
power supply.
If this condition occurs, it is because the system ground came into contact with something
that was "HOT" with respect to the power supply earth ground. Carefully check the system
ground and AC distribution in the area.
