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***Important installation notice*** 

Starting with serial number 125002477, the 

A125 Noise Reduction Module, Internal

 has a wider ribbon 

cable plug.  A limited number of these Noise Reduction Modules have two individual ribbon cable plugs.  
The wider ribbon cable plug(s) are too wide to fit into the blue 20-pin base station receptacle.  The 
receptacle on the wireless base station board must be trimmed and the ends opened.  Use a sharp razor 
knife and make four vertical cuts.  Fold the ends of the blue receptacle down as shown below.   

Caution -

 Be careful to not cut any components or circuit traces on the base station circuit board.   

Caution -

 Be careful to pull only on the ribbon connector plug.  Pulling on the ribbon cable itself may 

cause it to separate from the plug. 
 

Instructions for trimming and opening the base station receptacle: 

1.  Make a vertical cut at each corner of the blue 20-pin receptacle on the base station circuit 

board. 

2.  Fold the short end sides down as shown 
3.  Carefully insert the ribbon cable plug(s) into the blue receptacle.  The locking tab will not 

engage and should not be a problem.  

 

 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 

Summary of Contents for MODULE A125

Page 1: ...vers from the 3M base station Be careful that the main circuit board does not fall out of the plastic base 2 See Important installation notice on next page before performing this step Plug the A125 ribbon cable onto connector J8 located at the top of the left side of the circuit board Be careful to support the rear side of the base station circuit board when plugging in the A125 ribbon cable 3 Pos...

Page 2: ... four vertical cuts Fold the ends of the blue receptacle down as shown below Caution Be careful to not cut any components or circuit traces on the base station circuit board Caution Be careful to pull only on the ribbon connector plug Pulling on the ribbon cable itself may cause it to separate from the plug Instructions for trimming and opening the base station receptacle 1 Make a vertical cut at ...

Page 3: ... digitized and converted back to an analog voice signal without removing any noise The analog voice signal is then sent to the microphone input of the intercom Echo Reduction Used to reduce echo for full duplex intercom configurations Turn Echo Reduction OFF for half duplex intercom configuration Restaurant Truck Stop Noise Reduction Level When DIP Switch number 3 is OFF the board is set for resta...

Page 4: ... for truck stop mode 4 Set SW2 number 4 Hi Frequency Equalization to customer s preference 5 Check the inbound audio level of headset if TALK LOCK feature is used Attempt to adjust the inbound level when background noise in restaurant is at a high level Troubleshooting Problem Possible Cause Correction 1 Status fault indicated Inbound audio exceeded maximum level Switch A125 OFF for one second 2 N...

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