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Download 3M A121 Owner's Manual
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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 JMP2 Position A Position B * Separate microphone Do not use this position & speaker at menu sign/post * 3M Intercom HME Intercom Note: * Indicates factory default settings Table 1. 3M Noise Reduction Module Jumper Settings Mode Configuration The 3M Noise Reduction Board can be configured in several different modes by setting DIP switch, SW2. Following is a brief description of each mode and a DIP switch setting table. Noise Reduction: With SW2 number 1 ON, the inbound microphone voice signal is digitized. The noise is digitally removed from the voice and converted back to an analog voice signal. The analog voice signal is then sent to the microphone input of the intercom. Echo Reduction: With SW2 number 2 ON, echo is reduced for full-duplex intercom systems. Set SW2 number 2 OFF for half-duplex systems. Restaurant/Truck Stop Noise Reduction Level: With SW2 number 3 OFF, the A121 is set for restaurant noise reduction level. With SW2 number 3 ON, the A121 is used for truck stop noise reduction level, which provides more noise reduction with slightly more voice degradation. Hi Frequency Equalization: With SW2 number 4 ON, the higher-end frequencies are increased by 3 dB. This should be set to the customer’s preference. SW2 Number 1 ON Position OFF Position *Noise Reduction ON Test Mode (Normal Mode) (Factory use only; do not change.) 1 2 * Echo Reduction ON Echo Reduction OFF 2 3 Truck Stop Noise *2Restaurant Noise Reduction Level Reduction Level 2 4 Hi Frequency Equalization *2Hi Frequency Equalization OFF ON 5 Not Used Not Used Notes: * Indicates factory settings. 1 Must be ON for 3M, HME, and Panasonic Full Duplex Systems 2 Set to customer preference. Table 2. 3M Noise Reduction Module SW2 Settings Status Indication Table The condition of the red LED on the 3m Noise Reduction Module 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 LED. Status Power OFF Normal Mode Test Mode Fault Condition LED LED off. LED blinks once per second. LED blinks three times per second. LED is solid red (constantly illuminated). Table 3. 3M Noise Reduction Module Status Indication Final Checkout Procedure 1. Turn the ON/OFF switch of the A121 ON. The red LED should blink slowly. Listen for a reduction in the background noise. 2 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 1. Status fault indicated. Possible Cause Inbound audio exceeded maximum level. Mode setting is incorrect. Wiring is incorrect. Wiring is incorrect. Inbound audio on 3M base station too low. 2. No inbound audio. 3. No outbound audio. 4. Loud audio in 3M headset when headset user talks. 5. Excessive echo 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. Excessive feedback from menu speaker to menu mic. Table 4. A121 Noise Reduction Module Troubleshooting Wiring Diagrams 3M Base Station MIC MIC MIC OUT MIC OUT SHIELD MENU SPKR MENU SPKR MENU SPKR MENU SPKR Menu Post MENU INTERCOM 1 MIC IN MIC OUT 1 AUDIO OUT 2 MIC IN MIC OUT 2 ALT ALERT 3 SHLD SHLD 3 4 MENU SPKR MENU SPKR 4 5 MENU SPKR MENU SPKR 5 VEH DET ALERT OUT 12V UNREG A121 Noise Reduction Module Figure 1. Wiring for 3M C760/960/1060 Base Station 3 MENU MIC MENU SPKR Figure 2. Wiring for 3M C760/960/1060 Base Station with Interconnect Module 4 A121 Noise Reduction Module 3M Base Station MENU INTERCOM 1 MIC IN MIC OUT 1 MIC 2 MIC IN MIC OUT 2 MIC 3 SHLD SHLD 3 4 MENU SPKR MENU SPKR 4 5 MENU SPKR MENU SPKR 5 SHIELD MENU SPKR MENU SPKR Menu Post AUDIO OUT ALT ALERT VEH DET ALERT OUT COM MIC OUT COM MIC OUT MENU SPKR SHLD SHLD VEH DET MIC IN COM MIC IN MENU SPEAKER MENU MIC AUDIO IN 12V UNREG To Vehicle Detector 3M Audio-Level Control Figure 3. Wiring for 3M C760/960/1060 Base Station with 3M Audio-Level Control Module 3M D15/D30 Intercom MIC MIC A121 Noise Reduction Module MENU INTERCOM 1 MIC IN MIC OUT 1 2 MIC IN MIC OUT 2 3 SHLD SHLD 3 4 MENU SPKR MENU SPKR 4 5 MENU SPKR MENU SPKR 5 SHIELD SPEAKER SPEAKER Menu Post MENU MIC MENU SPKR Figure 4. Wiring for 3M D15/D30 Intercom 5 C921AA Base Station A300 Audio Greeter MIC TIMER TRIG MIC COM SHIELD MSG4 TRIG MENU SPKR VEH DETVEH DET+ 12 11 10 9 COM 8 VEH DET 7 MENU SPKR 6 MON SPKR COM COM MUSIC AUDIO IN MUSIC 4 AUDIO OUT 3 ALT ALERT COM _____ TALK VEH DET AUDIO OUT ALERT OUT COM 12V UNREG Optional Service Timer 5 2 AUDIO IN 1 J9 10 MENU SPKR INTERCOM SPKR 9 MENU SPKR INTERCOM SPKR COM 8 INTERCOM MIC 7 INTERCOM MIC 6 MIC MENU SPKR 5 MENU SPKR MENU SPKR 4 COM 3 MENU MIC MENU MIC 2 1 MIC A121 Noise Reduction Module Menu Post MENU INTERCOM 1 MIC IN MIC OUT 1 2 MIC IN MIC OUT 2 3 SHLD SHLD 3 4 MENU SPKR MENU SPKR 4 5 MENU SPKR MENU SPKR 5 MENU SPKR MENU SPKR MIC OUT MIC OUT J10 MENU MIC VEHICLE DETECTOR Figure 5. Wiring for 3M C760/960/1060 Base Station with A300 Audio Greeter 6 Panasonic WX-C510/WX-C1010 Base Station C SP/MIC H GND H Menu Post C INTERCOM MIC IN MIC OUT 1 2 MIC IN MIC OUT 2 3 SHLD SHLD 3 4 MENU SPKR MENU SPKR 4 5 MENU SPKR MENU SPKR 5 COM MENU MIC DET H MENU 1 SP H A121 Noise Reduction Module MIC C GND 12VAC MENU SPKR AC AC 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 MENU INTERCOM 1 MIC IN MIC OUT 1 2 MIC IN MIC OUT 2 3 SHLD SHLD 3 4 MENU SPKR MENU SPKR 4 5 MENU SPKR MENU SPKR 5 OUTSIDE SPKR * Needed for HME * * "Hands Free" system Menu Post MENU MIC MENU SPKR Figure 7. Wiring for HME SYS2500/DS/DSL Base Station 7 3M A300 Audio Greeter TIMER TRIG COM MSG4 TRIG VEH DETVEH DET+ COM MUSIC 12 VEHICLE DETECTOR ** Note: Set A300 vehicle detector trigger polarity to negative (set SW2 number 3 OFF and JMP1 to Position B). 6 Terminals 6 and 9 may also be used for a contact-closure connection. 11 5 GND 7 OUTPUT * 8 9 10 10 9 ** HME SYS2500D/DS/DSL Base Station 11 VEH DET SIG 8 12 SHLD 7 13 BLACK 6 VEH DET GND 14 SPKR/MIC RED J1 5 MUSIC 4 COM _____ TALK 3 4 2 5 VEH DET SIG 1 6 VEH DET GND AUDIO OUT J9 INTERCOM SPKR 10 WHITE 9 GREEN COM 8 SHLD INTERCOM MIC 7 BLACK INTERCOM MIC 6 INTERCOM SPKR MENU SPKR 5 MENU SPKR 4 COM 3 MENU MIC MENU MIC MENU INTERCOM 1 MIC IN MIC OUT 1 2 MIC IN MIC OUT 2 MENU SPKR MIC OUT MIC OUT BLACK 10 3M A121 Noise Reduction Module MENU SPKR 1 RED 8 9 RED 2 7 3 SHLD SHLD 3 4 MENU SPKR MENU 4 SPKR 5 MENU SPKR MENU 5 SPKR WHITE OUTSIDE SPEAKER GREEN J7 Menu Post MENU MIC MENU SPKR J10 Figure 8. Wiring for HME SYS2500D/DS/DSL Base Station with 3M A300 Audio Greeter 8 VEHICLE DETECTOR HME MR100A Message Repeater MENU SPKR MENU SPKR GND (SHIELD) MENU MIC MENU MIC 5 6 6 MENU SPKR 7 MENU SPKR GND 7 OUTPUT 8 9 10 8 9 MIC OUT 10 MIC OUT 11 12 SHLD BLACK BASE SPKR CONN 11 WHITE 13 BASE SPKR CONN 12 GREEN 14 GND (SHIELD) HME SYS2500D/DS/DSL Base Station SPKR/MIC RED J1 13 SHLD BASE MIC CONN 14 RED BASE MIC CONN 15 BLACK 4 16 VEH DET SIG 5 VEH DET SIG 17 6 VEH DET GND 18 7 RED 19 8 BLACK 20 VEH DET GND 9 VEH DET IN VEH DET OUT ENABLE/DISABLE EXT PLAY CANCEL GND 10 WHITE GREEN OUTSIDE SPEAKER J7 Menu Post MENU MIC MENU SPKR MENU INTERCOM 1 MIC IN MIC OUT 1 2 MIC IN MIC OUT 2 3 SHLD SHLD 3 4 MENU SPKR MENU 4 SPKR 5 MENU SPKR MENU 5 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 St. Paul, MN 55144-1000 © 3M 2006 May 78-6912-0699-5 Rev. E 9
