2.If the A121 is in a half-duplex system, set SW2 number 2 OFF and proceed to step 3.

If the A121 is in a full-duplex system set SW2 number 2 OFF. Speak into the headset mic or intercom mic. 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.

Troubleshooting

 

Problem

Possible Cause

1.

Status fault indicated.

Inbound audio exceeded maximum

 

 

level.

2.

No inbound audio.

Mode setting is incorrect.

 

 

Wiring is incorrect.

3.

No outbound audio.

Wiring is incorrect.

4.

Loud audio in 3M

Inbound audio on 3M base station too

headset when headset user

low.

talks.

 

5. Excessive echo

Excessive feedback from menu

 

 

speaker to menu mic.

Correction

Switch A121 off for one second.

Check mode configuration. Check wiring.

Check wiring.

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

Add extra acoustic insulation to menu mic chamber.

Table 4. A121 Noise Reduction Module Troubleshooting

Wiring Diagrams

3M Base Station

MIC

MIC SHIELD MENU SPKR MENU SPKR

AUDIO OUT ALT ALERT VEH DET

ALERT OUT

MIC OUT

MIC OUT

MENU SPKR

MENU SPKR

 

MENU

INTERCOM

 

1

MIC IN

MIC OUT

1

2

MIC IN

MIC OUT

2

3

SHLD

SHLD

3

4

MENU

MENU

4

SPKR

SPKR

 

 

5

MENU

MENU

5

SPKR

SPKR

 

 

 

 

 

 

Menu Post

MENU

MIC

MENU

SPKR

12V UNREG

A121 Noise Reduction Module

Figure 1. Wiring for 3M C760/960/1060 Base Station

3

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Image 3
3M Wiring Diagrams, Problem Possible Cause, Correction, A121 Noise Reduction Module Troubleshooting

A121 specifications

The 3M A121 is a high-performance adhesive that stands out in the market for its unique formulation and reliable performance in a variety of applications. Designed for bonding a multitude of materials, the A121 is particularly favored in industries such as automotive, electronics, and construction. Its versatility makes it an essential tool for professionals who demand precision and strength from their adhesives.

One of the standout features of the 3M A121 is its exceptional adhesion properties. The adhesive is formulated to bond effectively to both porous and non-porous surfaces, providing a strong hold that can withstand demanding conditions. This versatility allows users to apply the A121 in a range of settings, from assembly lines in manufacturing to repairs in residential and commercial construction.

The adhesive is also notable for its quick curing time, which enhances productivity by reducing the time required for projects. It is designed to reach full strength within a matter of hours, enabling faster turnaround times in both factory settings and field applications. This feature is particularly advantageous in fast-paced environments where time is of the essence.

In terms of technological advancements, the 3M A121 incorporates innovative adhesion technologies that enhance its performance. Its unique silicone technology allows for excellent moisture resistance, making it suitable for applications exposed to humidity or water. This characteristic is vital for industries like electronics, where moisture can compromise the integrity of the bond and the performance of the components involved.

Additionally, the A121 is known for its superior temperature resistance. This quality ensures that the adhesive maintains its bonding capabilities even under extreme heat or cold conditions, expanding its usability across various environments. This resilience makes it a preferred choice for automotive applications, where components often experience significant temperature fluctuations.

The 3M A121 is user-friendly as well; it can be easily applied with standard dispensing systems, ensuring a smooth and even application. The adhesive does not require complex preparation, making it accessible for both professional applicators and DIY enthusiasts.

In conclusion, the 3M A121 adhesive stands out for its exceptional adhesion properties, quick curing time, and advanced technologies that provide moisture and temperature resistance. Its versatility and ease of use make it an indispensable product for various industries, ensuring strong and reliable bonds in all applications.