NEM System Troubleshooting
NEM Series Trouble Shooting
1. Sub station does not call in, but there is communication.
Number and "E" wires are reversed.
Refer to the NEM Instructions.
2. Sub station call is momentary, but does not latch.
1. Jumper clip/wire at sub is missing (On the NA-A/AN, the jumper clip is between the "D" and "E" terminals. On the NA-NE and the NB-L, the "Green" and "Black" wires must be tied together, going to the "E" of the master).
2. If an LE- series sub station is being used without adding the PC-359B, the call will not latch. Add one PC-359B latching circuit board at each sub station. Contact Technical Support for modification instructions.
Refer to the NEM Instructions or PC-359B Instructions.
3. Existing NEM system has more than one light coming on when subs call in.
1. Make sure the station numbers on the master station or the number wires from the sub stations are not shorted together.
2. Other cause is possible power surge at the master. Send in for repair.4. NEM system has buzz or hum.
Wire was run too close to AC voltage or fluorescent lights. Shielded wire is recommended. If shielded wire was run, tie all the shields together and connect one end to an earth ground. Connect the negative of the power supply to an earth ground. (If noise is still there, try connecting ground to the E terminal of the master station.)
Refer to the NEM Instructions.
5. Constant call tone and LED from "SPEAKER ONLY" locations.
Speaker-only stations (SP-20N) require an NP-25V capacitor in series with the leg of each speaker that is connected to the number terminal on the NEM master. (This is only used when the speaker location does not have a call button to place a call to the master station.)
6. All Call is garbled or distorted.
Check for proper power supply. The NEM-10/10A and the NEM-20/20A require the PS-2410A, the NEM-30/30A and the NEM 40/40A require the PS-2420UL. If add-on selectors are included in the system, each one will require its own power supply. The N-20AS requires a PS-2410A and the N-40AS requires a PS-2420UL.
Refer to the NEM Instructions or N-AS Instructions.
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