3M A121 Owner's Manual
Contents
1. 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 92. 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 e 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 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 JMP1 and JMP2 settings 1 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 A Position B Position JMP1 Separate microphone Do not use this position amp speaker at menu sign post JMP2 3M Intercom HME Intercom Note Indicates factory default settings Table 1 3M Noise Reduction Module Jumper Settings Mode Configuration The 3
3. SIWdS OIN A121 Noise Reduction Module INTERCOM MIC OUT dS Menu Post MIC OUT SHLD MENU SPKR MENU SPKR o 19 Figure 6 Wiring for Panasonic WX C510 WX C1010 Base Station HME SYS2500 DS DSL Base Station MIC SPKR MIC SPKR SHIELD I OUTSIDE SPKR A121 Noise Reduction Module ouTSIDE INTERCOM MIC OUT MIC OUT SHLD Needed for HME MENU Hands Free system SPKR MENU MENU SPKR Menu Post Figure 7 Wiring for HME SYS2500 DS DSL Base Station 7 Menu Post Note VEHICLE 22 Set A300 vehicle detector EVECTOR 5 1 3M A300 trigger polarity to negative set SA a Audio Greeter SW2 number 3 OFF and Billa D SYS2500D DS DSL JMP1 to Position B GND 7 Base Station 1 TPUT TIMER TRIG 12 Terminals 6 and 9 may also QUTPU in 48 4 M Ty be used for a contact closure i eo connection mses TRIG 19 T ie 11 ven per M2 VEH DET SiG q 12 DET 78 SHLD 7 t 113 J BLACK T8 VEH DET GND I fT ago SPKRIMIC J1 Music 9 music 14 MM COM 3 4 q 5 TALK D VEH DET SIG 6 AUDIO our D 6_ VEH DET GND 49 7 INTERCOM SPKR 12 8 TD BLACK INTERCOM SPKR T S GREEN HT WHITE T8 mul 3M A121 Noise R
4. 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 LED Power OFF LED off Normal Mode LED blinks once per second Test Mode LED blinks three times per second Fault Condition 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 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 SW2 number 3 ON for truck stop mode Troubleshooting Set SW2 number 3 for appropriate level of noise reduction Set SW2 number 3 OFF for restaurant mode Set Set SW2 number 4 Hi Frequency Equalization to customer s preference 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 Check mode configuration head
5. IC IN MIC OUT SHLD SHLD MENU SPKR MENU SPKR MENU SPKR MENU SPKR 1 2 3 4 59 200290292022 1234567 8 Q10 O9 Q8 Os Os 4 O2 Q1 1 RELAY COM 2 3 MON SPKR 40 DET 5 05 s OSM 7 OUTSIDE MIC OUTSIDE ID 18VDC 102 COMMON RELAY VEH DET COMMON GRN RELAY BLK POWER GRN MON SIGNAL 34 WHT MON SPKR DET WHT OSM osm YeL BLU OSM OSM OUTSIDE OUTSIDE MIC rel BLU OUTSIDE BLK OUTSIDE MIC Mie BLU 18 SHLD ie BRN BLK coM common INTERCONNECT MODULE SP 362A Figure 2 Wiring for 3M C760 960 1060 Base Station with Interconnect Module A121 Noise Reduction Module 3M Base Station INTERCOM MIC OUT MIC OA MIC OUT MIC OA SHLD MENU SHIELD qQ SPKR MENU SPKR KENG Menu Post MENU SPEAKER AUDIO OUT D ALT ALERT D VEH DET MENU ALERT OUT D D D AUDIO IN 12V UNREG D 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 A121 Noise Reduction Module SHIELD INTERCOM MIC
6. M 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 ON Position OFF Position Number 1 Noise Reduction ON Test Mode Normal Mode Factory use only do not change Echo Reduction ON Echo Reduction OFF 3 Truck Stop Noise Restaurant Noise Reduction Level Reduction Level 4 Hi Frequency Equalization Hi Frequency Equalization OFF ON 5 Not Used Not Used Notes Indicates factory settings Must be ON for 3M HME and Panasonic Full Duplex Systems Set to customer preference
7. OUT MIGOUT SPEAKER SPEAKER SHLD MENU SPKR MENU SPKR Menu Post MENU MIC MENU SPKR Figure 4 Wiring for 3M D15 D30 Intercom C921AA Base Station N 1 1 D MENU SPKR D MENU SPKR MON SPKR p my AUDIO IN AUDIO OUT D ALT ALERT 57 M44 VEH DET iw ALERT OUT com 12V UNREG gt Figure 5 Wiring for 3M C760 960 1060 Base Station with A300 Audio Greeter A300 Audio Greeter Optional Service Timer TIMER TRIG _ 11 COM msG4 TRIG 1 19 9 COM DET VEH DET 8 VEH DET 176 music 5 music 39 I TALK AUDIO IN AUDIO OUT J INTERCOM SPKR 12 INTERCOM SPKR 2 4 18 ale MIC 6 INTERCOM MIC x INTERCOM MIC 1 MENU SPKR MENU SPKR MENU SPKR A121 Noise Reduction Module MENU SPKR Is MENU SPKR 14 MENU 2 MENU MIC 4 MIC OUT 2 1 MENU MIC DH MIQOUT M MENU INTERCOM m D 1 MIC IN MIC OUT 1 Ta D MIC IN MIC OUT 2 W sup SHLD N S M MENU MENU 4 D EE J SPKR SPKR X T ys MENU MENU s D gt sPkR J Menu Post VEHICLE DETECTOR Panasonic WX C510 WX C1010 Base Station
8. eduction Module 10 1 MENU INTERCOM MIC IN MIC OUT INTERCOM amp 2 MENU SPKR 5 MENU SPKR IMIC IN MIC OUT MENU SPKR 4 MENU SPKR ISHLD SHLD PS 2 MIC OUT MENU MENU ISPKR SPKR MENU MENU ISPKR SPKR o MENU MIC MENU MIC J10 Figure 8 Wiring for HME SYS2500D DS DSL Base Station with 3M A300 Audio Greeter VEHICLE 5 s MU HME Message ES D SvszsooD bsipsL 4 Base Station MENU SPKR MENU _ OUTPUT MENU 2 MENU SPKR D GND SHIELD 10 J MENU mic Mic OUT MENU gt 2 mc D SHLD SPKR CONN EQ BLACK BASE SPKR CONN 1 14 Dace SPKR MIC GND SHIELD BASE MIC CONN C BASE MIC CONN 15 BLACK i J DET IN 716 DET SIG VEH DET SIG AN DET our VEH DET GND 18 ENABLE DISABLE EXT PLAY CANCEL 7719 GND 20 GND RED BLACK WHITE OUTSIDE SPEAKER J7 Menu Post INTERCOM IN MIC OUT 1 M MIC IN MIC OUT 2 D ISHLD SHLD J MENU MENU ISPKR SPKR 5 MENU MENU 5 ISPKR SPKR X
9. set when headset user talks low Wiring is incorrect Check wiring 3 No outbound audio Wiring is incorrect Check wiring 4 Loud audio in 3M Inbound audio on 3M base station too 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 Wiring Diagrams Table 4 A121 Noise Reduction Module Troubleshooting 3M Base Station mic MIC OUT mic D SHIELD MENU SPKR MENU SPKR MENU SPKR MENU SPKR D D D AUDIO OUT ALT ALERT DET D ALERT OUT D D 12V UNREG D MENU MIC IN MIC IN SHLD SHLD MENU SPKR MENU SPKR MENU SPKR MENU SPKR INTERCOM MIC OUT MIC OUT Menu Post MENU MIC MENU SPKR A121 Noise Reduction Module Figure 1 Wiring for 3M C760 960 1060 Base Station BASE STATION TERMINALS MIC 1 MC 22 3M NOISE REDUCTION MODULE SHIELD 3 2 MENU SPKR 4 2 MENU SPKR 5 2 SPKR 6 2 MON SEKR 7 COMMON 8 10 2 DET 11 EH DET 12 13 RELAY 12 UNREG 14 TYPICAL OUTSIDE MIC S OUTSIDE MIC 2 93 OSM S4 OSM S5 MENU INTERCOM MIC IN MIC OUT M
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