Instruction/ maintenance manual of the product A121 3M
Go to page of 9
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 environm ental background noise from vehicles, ai rplanes, noisy intersections, etc.
2 Mode Configuration The 3M Noise Reduction Board can be configured in sev eral 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.
3 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 num ber 2 OFF. Speak into the headset mic or intercom mic. The echo should increase. Turn SW2 numb er 2 back ON. The echo should decrease.
4 Figure 2. Wiring for 3M C760/960/1060 Base Station with Interconnect Module.
5 Menu Po st To Vehicle Detector MENU SPKR ALT ALERT ALERT OU T MENU SPKR SHIELD MIC MIC AUDIO OUT 3M Base Station MEN U SPEAKER MEN U MIC COM 12V UNREG VEH DET MENU SPKR MENU SPKR MENU SPKR MENU SPKR.
6 C921AA Base Station INTE RCOM SPKR COM INTERCOM MIC INTERCOM MIC MENU SPKR INTE RCOM SPKR 9 10 8 7 6 5 4 3 2 1 COM MENU MIC MENU MIC MENU SPKR VEH DET + COM MUSI C COM _____ TAL K AUDIO OUT 3 4 5 6 .
7 Panasonic WX-C510/WX-C 1010 Base Statio n C COM GND AC AC H H C GND H H C MIC SP/MIC SP DET 12VAC A12 1 Noise R eduction M odule MENU SPKR MENU SPKR MENU SPKR MENU SPKR SHLD SHLD MI C IN MI C OU T 1 2 3 4 55 4 3 2 1 MIC OUT MIC IN MENU INTERCOM Menu Po st MEN U MI C MENU SPKR Figure 6.
8 F igure 8. Wiring for HME SYS2500D/DS/DSL Base Station with 3M A300 Audio Greeter HME SYS2500D/DS/DSL Base Station Menu Post 3M A121 Noise Reduction Module INTERCOM SPKR COM INTERCOM MI C INTERCOM M.
9 HME SYS2 500D/DS/D SL Base Station 3M A 121 Noise Reduction M od ule GND EXT PLAY CANCEL 20 19 MENU MI C BASE SPKR CONN GND (SHIELD) BASE MIC CONN VEH DET IN VEH DET OUT 15 14 13 12 11 16 17 10 9 8 .
An important point after buying a device 3M A121 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought 3M A121 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data 3M A121 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, 3M A121 you will learn all the available features of the product, as well as information on its operation. The information that you get 3M A121 will certainly help you make a decision on the purchase.
If you already are a holder of 3M A121, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime 3M A121.
However, one of the most important roles played by the user manual is to help in solving problems with 3M A121. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device 3M A121 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
