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****** Page 1 ****** Noise Reduction Module Model A 121 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 A 121 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 (JMPI and JMP2) settings. JMPI 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 JMPI JMP2 Position A * Separate microphone & speaker at menu sigWpost * 3M Intercom Position B Do not use this position HME Intercom Note: * Indicates factory default settings Table 1. 3M Noise Reduction Module Jumper Settings

****** Page 2 ****** 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 SW 2 number I 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 SW 2 number 2 ON, echo is reduced for full-duplex intercom systems. Set SW 2 number 2 OFF for half-duplex systems. Restaurant/Truck Stop Noise Reduction Level: With SW2 number 3 OFF, the A 121 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 SW 2 number 4 ON, the higher-end frequencies are increased by 3 dB. This should be set to the customer’s preference. sw2 Number 1 2 3 4 5 Notes: ON Position *Noise Reduction ON (Normal Mode) * IEcho Reduction ON 2 Truck Stop Noise Reduction Level 2 Hi Frequency Equalization ON Not Used * Indicates factory settings. OFF Position Test Mode (Factory use only; do not change.) Echo Reduction OFF *2Restaurant Noise Reduction Level *2Hi Frequency Equalization OFF Not Used 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

****** Page 3 ****** 2. 3. 4. Ifthe A 121 is in a half-duplex system, set SW 2 number 2 OFF and proceed to step 3. Ifthe 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 SW 2 number 2 back ON. The echo should decrease. Set SW 2 number 3 for appropriate level of noise reduction. Set SW 2 number 3 OFF for restaurant mode . Set SW 2 number 3 ON for truck stop mode. Set SW 2 number 4 (Hi Frequency Equalization) to customer’s preference. Troubleshooting 1. 2. 3. 4. Problem Status fault indicated. No inbound audio. No outbound audio. Loud audio in 3M headset when headset user talks. 5. Excessive echo 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. 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 MIC OUT MIC OUT MENU SPKR MENU SPKR AUDIO OUT ALT ALERT VEH DET ALERT OUT (D 12V UNREG Figure 1. 1 2 3 4 5 MENU MIC IN MIC IN SHLO MENU SPKR MENU SPKR INTERCOM MIC OUT MIC OUT SHLD MENU SPKR MENU SPKR 1 2 3 40 5 (II) Menu Post MENU MIC MENU SPKR A121 Noise Reduction Module Wiring for 3M C760/960/1060 Base Station 3

****** Page 4 ****** MIC MIC SHIELD MENU SPKR MENU SPKR MON SPKR COM BASE 3M NOISE REDUCTION MODULE STATION TERMINALS 06 OSM 0 5 OSM 0 1 COM 2 3 4 5 MON SPKR 6 COMMON 7 OUTSIDE MIC OUTSIDE MIC COMMON osM OSM 010 MENU 1 MIC IN 2 MIC IN 3 SHLD 4 MENU SPKR 5 MENU SPKR INTERCOM MIC OUT 1 MIC OUT 2 SHLD 3 MENU SPKR 4 MENU SPKR 5 10 VEH DET VEH DET 11 12 RELAY COM COM 13 +18VDC 12V UNREG 14 (TYPICAL) eeoeeeoo 12 3 ‘45678 VEH DET +18VDC SIGNAL—I MON SPKR 0 7 COM—J OUTSIDE MIC OUTSIDE MIC SHLD RELAY COMMON RELAY POWER MON SPKR DET OSM OSM OUTSIDE MIC OUTSIDE MIC +18 VDC COMMON GRN BLK/ GRN WHT BLK/ WHT YEL BLU/ YEL BLU BLK/ BLU BRN BLK/ 10 BRN 2 3 4 5 6 7 8 9 INTERCONNECT MODULE RELAY COM MON SPKR VEH DET OSM OSM OUTSIDE MIC OUTSIDE Mlc +18VDC COMMON sp-362A Figure 2. Wiring for 3M C760/960/1060 Base Station with Interconnect Module 4

****** Page 5 ****** A121 Noise Reduction Module 3M Base Station MIC MIC SHIELD MENU SPKR MENU SPKR AUDIO OUT ALT ALERT VEH DET ALERT OUT COM 12V UNREG To Vehicle Detector 1 2 3 4 5 MENU MIC IN MIC IN SHLD MENU SPKR MENU SPKR INTERCOM MIC OUT MIC OUT SHLD MENU SPKR MENU SPKR 1 2 3 4 5 MIC OUT MIC OUT SHLO VEH DET COM AUDIO IN COM MENU SPKR SHLD MIC IN MIC IN Menu Post MENU SPEAKERI MENU MIC 3M Audio-Level Control Figure 3. Wiring for 3M C760/960/1060 Base Station with 3M Audio-Level Control Module 3M D15/D30 Intercom A121 Noise Reduction Module 1 2 3 4 5 MENU MIC IN MIC IN SHLD MENU SPKR MENU SPKR INTERCOM MIC OUT MIC OUT SHLO MENU SPKR MENU SPKR 1 2 3 4 5 Figure 4. MIC MIC SHIELD SPEAKER SPEAKER Menu Post MENU MIC MENU SPKR Wiring for 3M D15/D30 Intercom 5

****** Page 6 ****** C921AA Base Station MIC MIC SHIELD MENU SPKR MENU SPKR MON SPKR AUDIO IN AUDIO OUT ALT ALERT VEH DET ALERT OUT COM 12V UNREG Figure 5. A300 Audio Greeter 12 TIMER TRIG 11 COM (DIO MSG4 TRIG 9 VEH DET- 8 VEH DET+ (ID7 MUSIC 04 MUSIC COM 03 ükCll)2 COM VEH DET AUDIO IN MENU SPKR MIC IC Optional Service Timer A121 Noise Reduction Module AUDIO OUT INTERCOM SPKR INTERCOM SPKR INTERCOM MIC INTERCOM MIC MENU SPKR MENU SPKR COM MENU MIC MENU MIC JIO 10 8 7 6 5 4 3 2 MéNlJ SPKR MENU SPKR MIC OUT I MI OUT 1 2 3 kllJ MENU MIC IN MIC IN SHLO MENU SPKR MENU SPKR INTERCOM MIC OUT MIC OUT SHLO MENU SPKR MENU SPKR 10 20 3 Menu Post MENU SPKR MENU MIC VEHICLE DETECTOR Wiring for 3M C 760/960/1060 Base Station with A3()0 Audio Greeter 6

****** Page 7 ****** Panasonic wx-C510/wx-C1010 Base Station A121 Noise Reduction Module Menu Post MENU MIC MENU SPKR 1 2 3 4 5 MENU MIC IN MIC IN SHLD MENU SPKR MENU SPKR INTERCOM MIC OUT MIC OUT SHLD MENU SPKR MENU SPKR 1 2 3 4 5 c GND c c COM GND AC AC Figure 6. Wiring for Panasonic wx-C510/wx-C1010 Base Station HME SYS2500/DS/DSL Base Station MIC/SPKR A121 Noise Reduction Module 1 2 3 4 5 MENU MIC IN MIC IN SHLD MENU SPKR MENU SPKR INTERCOM MIC OUT MIC OUT SHLO MENU SPKR MENU SPKR 1 2 3 4 5 Figure 7. MIC/SPKR SHIELD OUTSIDE SPKR OUTSIDE SPKR * Needed for HME “Hands Free” system Menu Post MENU MIC MENU SPKR Wiring for HME SYS2500/DS/DSL Base Station 7

****** Page 8 ****** 012 TIMER TRIG COM Oil (DIO MSG4 TRIG 9 VEH DET- VEH DET+ 07 COM 05 MUSIC 04 MUSIC 3 COM 02 TALK AUDIO OUT 10 INTERCOM SPKR INTERCOM SPKR 8 COM 7 INTERCOM MIC 6 INTERCOM MIC 5 MENU SPKR 4 MENU SPKR 3 COM 2 MENU MIC 1 MENU MIC JIO Figure 8. Note: Set A300 vehicle detector trigger polarity to negative (set 3M A300 SW2 number 3 OFF and Audio Greeter 101) 4 SPKR SPKR VEHICLE DETECTOR 5 6 7 (D (D HME SYS2500D/DS/DSL Base Station JMPI to Position B). Terminals 6 and 9 may also be used for a contact-closure GND OUTPUT * connection. VEH DET SIG VEH DET GND GREEN SHLD BLACK II RED MENU SPKR MENU SPKR MIC OUT MIC OUT 100 IICD 12 13 14 5 6 7 8 9 10 SHLD BLACK SPKR/MIC RED VEH DET SIG VEH DET GND (l) RED (II) BLACK WHITE OUTSIDE SPEAKER GREEN 3M A121 Noise Reduction Module ENU INTERCOM O 2 3 SHLO MENU MENU MIC OUT MIC OUT SHLO MENU SPKR MENU SPKR 10 20 30 am Menu Post MENU MIC MENU SPKR Wiring for 11ME SYS2500D/DS/DSL Base Station with 3M A300 Audio Greeter 8

****** Page 9 ****** O I-IME MRIOOA Message Repeater VEHICLE DETECTOR INTERCOM GND OUTPUT 5 6 7 8 HME O SYS2500D/DS/DSL Base Station MENU SPKR MENU SPKR GND (SHIELD) MENU MIC MENU MIC BASE SPKR CONN BASE SPKR CONN GND (SHIELD) BASE MIC CONN BASE MIC CONN VEH DET IN 6 7 8 9 10 13 14 15 16 MENU SPKR MENU SPKR MIC OUT I OUT WHITE GREEN RED BLACK VEH DET SIG VEH DET GND 9411) 10 (D 11 12 SHLD BLACK SPKR/MIC 14 017 VEH DET OUT (l) 18 ENABLE/DISABLE 019 EXT PLAY CANCEL 20 GND Menu Post MENU MIC MENU SPKR 4 5 6 7 8 9 RED (D VEH DET SIG VEH DET GND (D RED (D BLACK WHITE OUTSIDE SPEAKER GREEN 2 3 4 5 MENU WC IN WC IN SHLO MENU SPKR MENU SPKR MIC OUT MIC OUT SH MEN SPKR MEN SPKR 1 2 3 Figure 9. 3M A121 Noise Reduction Module Wiring for HME SYS2500D/DS/DSL Base Station with HME MRIOOA Message Repeater 3M Commercial Care Division Food Services trade Department 3M Center St. Paul, MN 55144-1000 0 3M 2006 May 78-6912-0699-5 Rev. E 9


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INSTRUCTION GUIDE – INSTRUCTION MANUAL

3M A121 (01) PDF MANUAL

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