3M A125 installation instructions Status Indication, Final Checkout Procedure, Troubleshooting

Status Indication

The condition of the red LED on the 3M C960 base station indicates the current status of the unit. The LED can be off, blink at defined intervals, or be constantly lit. Table 3 illustrates the status indicated by the LEDs.

Status	LED
Power OFF	LED Off
Normal Mode	LED blinks once per every two seconds
Test Mode	LED blinks three times per second
Fault Condition	LED is solid red (constantly lit)
	Table 3. A125 Status Indication

Final Checkout Procedure

1.On the C921BA Base Station, turn the NRM ON/OFF switch ON. The red LED should blink slowly. Listen for a reduction in the background noise.

2.If the A125 is in a half-duplex system, set SW2 number 2 OFF and proceed to step 3.

If the A125 is in a full-duplex system set SW2 number 2 OFF. Speak into the headset microphone. The echo should increase. Turn SW2 number 2 back ON. The echo should decrease.

3.Set SW2 number 3 for appropriate level of noise reduction. Set SW2 number 3 OFF for restaurant mode. Set SW2 number 3 ON for truck stop mode.

4.Set SW2 number 4 (Hi Frequency Equalization) to customer’s preference.

5.Check the inbound audio level of headset if TALK LOCK feature is used. Attempt to adjust the inbound level when background noise in restaurant is at a high level.

Troubleshooting

	Problem	Possible Cause
1.	Status fault indicated.	Inbound audio exceeded maximum
		level.
2.	No inbound audio.	Mode setting is incorrect.
3.	Loud audio in 3M	Inbound audio on 3M base station too
headset when headset user		low.
talks.
4.	Excessive echo	Excessive feedback from menu
		speaker to menu mic.
5.	Low inbound audio when	Background noise inside restaurant
using C960/C860 TALK		may cause inbound audio to be
LOCK feature.		reduced.

Correction

Switch A125 OFF for one second.

Check mode configuration.

Check wiring from post to base station. Reinstall A125 module.

Increase MENU MIC SENS potentiometer. Headset user should then reduce the headset audio volume.

Add extra acoustic insulation to menu mic chamber.

Increase MENU MIC SENS potentiometer.

	Table 4. A125 Noise Reduction Module Troubleshooting
3M Commercial Care Division
Food Services Trade Department
3M Center	© 3M December 2005
St. Paul, MN 55144-1000	78-6912-0723-3 Rev. B

4