3M Noise Reduction Machine A121 User Manual

Noise Reduction Module  
Model A121  
Installation Instructions  
Description  
The 3M Noise Reduction Module (3M part number 78-9236-6403-7) improves the inbound intelligibility of an  
intercom system by reducing environmental background noise from vehicles, airplanes, noisy intersections, etc.  
Additional Material Required  
18 - 22 AWG twisted - shielded pair audio wire  
2 mounting screws and appropriate wall anchors  
Important: The 3M Noise Reduction Module should be mounted no more than 3 feet from the intercom or base  
station.  
System Requirements  
The 3M Noise Reduction Module requires a system with a separate outside microphone and speaker. The A121 will  
not function with an intercom system configured to use a single speaker as both the microphone and speaker. The  
A121 will work in conjunction with most dynamic microphones and speaker/microphone assemblies.  
System Configuration  
The 3M Noise Reduction Module configuration is controlled by two jumper switch (JMP1 and JMP2) settings.  
JMP1 is used to set the appropriate gain for the MENU MICROPHONE.  
JMP2 is used to match the A121 output level to the input of the intercom system.  
Jumper  
Position  
JMP1  
Position A  
Position B  
* Separate microphone  
& speaker at menu  
sign/post  
Do not use this position  
JMP2  
* 3M Intercom  
HME Intercom  
Note: * Indicates factory default settings  
Table 1. 3M Noise Reduction Module Jumper Settings  
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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  
Correction  
1. Status fault indicated.  
Inbound audio exceeded maximum  
level.  
Switch A121 off for one second.  
2. No inbound audio.  
Mode setting is incorrect.  
Wiring is incorrect.  
Check mode configuration.  
Check wiring.  
3. No outbound audio.  
Wiring is incorrect.  
Check wiring.  
4. Loud audio in 3M  
headset when headset user  
talks.  
Inbound audio on 3M base station too  
low.  
Increase MENU MIC SENS  
potentiometer. Headset user should  
then reduce the headset audio volume.  
5. Excessive echo  
Excessive feedback from menu  
speaker to menu mic.  
Add extra acoustic insulation to menu  
mic chamber.  
Table 4. A121 Noise Reduction Module Troubleshooting  
Wiring Diagrams  
3M Base Station  
MIC OUT  
MIC OUT  
MIC  
MIC  
SHIELD  
MENU SPKR  
MENU SPKR  
MENU SPKR  
MENU SPKR  
Menu Post  
MENU  
INTERCOM  
1
2
3
4
5
MIC IN  
MIC OUT  
1
2
3
4
5
MENU  
MIC  
MIC IN  
SHLD  
MIC OUT  
SHLD  
AUDIO OUT  
ALT ALERT  
VEH DET  
MENU  
SPKR  
MENU  
SPKR  
MENU  
SPKR  
MENU  
SPKR  
MENU  
SPKR  
ALERT OUT  
12V UNREG  
A121 Noise Reduction Module  
Figure 1. Wiring for 3M C760/960/1060 Base Station  
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Figure 2. Wiring for 3M C760/960/1060 Base Station with Interconnect Module  
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A121 Noise Reduction Module  
MENU  
INTERCOM  
3M Base Station  
1
2
3
4
5
MIC IN  
MIC OUT  
1
2
3
4
5
MIC IN  
SHLD  
MIC OUT  
SHLD  
MIC  
MIC  
MENU  
SPKR  
MENU  
SPKR  
SHIELD  
MENU  
SPKR  
MENU  
SPKR  
MENU SPKR  
MENU SPKR  
Menu Post  
MIC OUT  
MIC OUT  
SHLD  
COM  
MENU  
SPEAKER  
MENU  
SPKR  
AUDIO OUT  
ALT ALERT  
VEH DET  
SHLD  
VEH DET  
COM  
MIC IN  
MIC IN  
MENU  
MIC  
ALERT OUT  
COM  
AUDIO IN  
12V UNREG  
3M Audio-Level Control  
To Vehicle Detector  
Figure 3. Wiring for 3M C760/960/1060 Base Station with 3M Audio-Level Control Module  
3M D15/D30 Intercom  
MIC  
MIC  
SHIELD  
A121 Noise Reduction Module  
MENU  
INTERCOM  
1
2
3
4
5
MIC IN  
MIC OUT  
1
2
3
4
5
SPEAKER  
SPEAKER  
MIC IN  
SHLD  
MIC OUT  
SHLD  
MENU  
SPKR  
MENU  
SPKR  
MENU  
SPKR  
MENU  
SPKR  
Menu Post  
MENU  
MIC  
MENU  
SPKR  
Figure 4. Wiring for 3M D15/D30 Intercom  
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A300 Audio Greeter  
Optional Service Timer  
C921AA Base Station  
12  
MIC  
MIC  
TIMER TRIG  
11  
COM  
10  
MSG4 TRIG  
SHIELD  
COM  
9
VEH DET-  
MENU SPKR  
VEH DET  
8
VEH DET+  
7
MENU SPKR  
MON SPKR  
6
COM  
5
MUSIC  
COM  
AUDIO IN  
4
MUSIC  
3
AUDIO OUT  
COM  
_____  
TALK  
2
ALT ALERT  
VEH DET  
ALERT OUT  
COM  
AUDIO IN  
1
AUDIO OUT  
J9  
10  
MENU SPKR  
INTERCOM SPKR  
9
MENU SPKR  
INTERCOM SPKR  
12V UNREG  
8
COM  
A121 Noise Reduction Module  
7
MIC  
MIC  
INTERCOM MIC  
6
INTERCOM MIC  
Menu Post  
MENU  
INTERCOM  
5
4
3
2
1
MENU SPKR  
MENU SPKR  
MENU SPKR  
MENU SPKR  
COM  
1
2
3
4
5
MIC IN  
MIC OUT  
1
2
3
4
5
MENU  
SPKR  
MIC IN  
SHLD  
MIC OUT  
SHLD  
MIC OUT  
MIC OUT  
MENU MIC  
MENU  
SPKR  
MENU  
SPKR  
MENU  
MIC  
MEJNU10MIC  
MENU  
SPKR  
MENU  
SPKR  
VEHICLE  
DETECTOR  
Figure 5. Wiring for 3M C760/960/1060 Base Station with A300 Audio Greeter  
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Panasonic WX-C510/WX-C1010  
Base Station  
H
C
GND  
C
H
H
A121  
C
Noise Reduction Module  
Menu Post  
H
MENU  
INTERCOM  
1
2
3
4
5
MIC IN  
MIC OUT  
1
2
3
4
5
COM  
GND  
AC  
MENU MIC  
MIC IN  
SHLD  
MIC OUT  
SHLD  
MENU  
SPKR  
MENU  
SPKR  
AC  
MENU SPKR  
MENU  
SPKR  
MENU  
SPKR  
Figure 6. Wiring for Panasonic WX-C510/WX-C1010 Base Station  
HME SYS2500/DS/DSL  
Base Station  
MIC/SPKR  
MIC/SPKR  
SHIELD  
OUTSIDE SPKR  
A121 Noise Reduction Module  
OUTSIDE SPKR  
MENU  
INTERCOM  
1
2
3
4
5
MIC IN  
MIC OUT  
1
2
3
4
5
MIC IN  
SHLD  
MIC OUT  
SHLD  
*
Needed for HME  
"Hands Free" system  
*
MENU  
SPKR  
MENU  
SPKR  
*
MENU  
SPKR  
MENU  
SPKR  
Menu Post  
MENU  
MIC  
MENU  
SPKR  
Figure 7. Wiring for HME SYS2500/DS/DSL Base Station  
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VEHICLE  
DETECTOR  
** Note:  
Set A300 vehicle detector  
trigger polarity to negative (set  
SW2 number 3 OFF and  
JMP1 to Position B).  
5
HME  
3M A300  
Audio Greeter  
6
SYS2500D/DS/DSL  
Base Station  
GND  
7
OUTPUT *  
8
12  
Terminals 6 and 9 may also  
be used for a contact-closure  
connection.  
TIMER TRIG  
9
11  
COM  
10  
11  
12  
13  
14  
10  
MSG4 TRIG  
** VEH DET SIG  
9
VEH DET-  
8
SHLD  
VEH DET+  
7
BLACK  
SPKR/MIC  
VEH DET GND  
6
RED  
COM  
J1  
5
MUSIC  
4
MUSIC  
4
3
COM  
_____  
TALK  
5
2
VEH DET SIG  
VEH DET GND  
RED  
6
1
AUDIO OUT  
J9  
7
8
10  
9
WHITE  
BLACK  
INTERCOM SPKR  
INTERCOM SPKR  
GREEN  
9
WHITE  
OUTSIDE  
SPEAKER  
10  
8
7
6
5
4
3
2
1
SHLD  
3M A121 Noise Reduction Module  
COM  
INTERCOM MIC  
INTERCOM MIC  
MENU SPKR  
MENU SPKR  
COM  
GREEN  
J7  
BLACK  
Menu Post  
MENU  
INTERCOM  
RED  
1
2
3
4
5
MIC IN MIC OUT  
1
2
3
4
5
MENU SPKR  
MENU SPKR  
MENU  
MIC  
MIC IN MIC OUT  
SHLD  
SHLD  
MENU  
SPKR  
MENU  
SPKR  
MIC OUT  
MIC OUT  
MENU  
SPKR  
MENU MIC  
MENU  
SPKR  
MENU  
SPKR  
MEJNU10MIC  
Figure 8. Wiring for HME SYS2500D/DS/DSL Base Station with 3M A300 Audio Greeter  
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VEHICLE  
DETECTOR  
5
HME  
HME MR100A  
Message Repeater  
6
SYS2500D/DS/DSL  
Base Station  
GND  
7
OUTPUT  
8
6
MENU SPKR  
MENU SPKR  
MENU SPKR  
MENU SPKR  
GND (SHIELD)  
MENU MIC  
9
7
10  
11  
12  
13  
14  
8
MIC OUT  
MIC OUT  
WHITE  
9
10  
11  
12  
13  
14  
SHLD  
MENU MIC  
BLACK  
SPKR/MIC  
RED  
J1  
BASE SPKR CONN  
GREEN  
BASE SPKR CONN  
SHLD  
RED  
GND (SHIELD)  
BASE MIC CONN  
4
15  
16  
BLACK  
BASE MIC CONN  
VEH DET IN  
VEH DET SIG  
5
VEH DET SIG  
VEH DET GND  
RED  
6
17  
18  
19  
20  
VEH DET OUT  
7
ENABLE/DISABLE  
8
BLACK  
EXT PLAY CANCEL  
GND  
9
VEH DET GND  
WHITE  
OUTSIDE  
10  
SPEAKER  
GREEN  
J7  
Menu Post  
MENU  
INTERCOM  
1
2
3
4
5
MIC IN  
MIC OUT  
MIC OUT  
SHLD  
1
2
3
4
5
MENU  
MIC  
MIC IN  
SHLD  
MENU  
SPKR  
MENU  
SPKR  
MENU  
SPKR  
MENU  
SPKR  
MENU  
SPKR  
3M A121 Noise Reduction Module  
Figure 9. Wiring for HME SYS2500D/DS/DSL Base Station with HME MR100A Message Repeater  
3M Commercial Care Division  
Food Services trade Department  
3M Center  
© 3M 2006 May  
St. Paul, MN 55144-1000  
78-6912-0699-5 Rev. E  
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