3m c960 installation manual
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3m c960 installation manualCross-Lane Wiring Diagram All Rights Reserved. St. Paul, MN 55144-1000 78-6912-0673-0 Rev C. The publishing dates for the front matter, individual sections, and separately-published documents are as follows:. It is designed to provide two-way, radio-frequency audio. The menu sign. It consists of one base station and one or vehicle alert system provides a signal to the base more headsets and battery chargers. It is Microphone Boom Assembly replaceable as a separate unit. Speaker Assembly Speaker Assembly Rechargeable Battery The speaker assembly is housed between the inner The nickel metal hydride battery provides DC power and outer cases and is replaceable as a separate unit. For this reason, the accompanying base station diagram To the monitor speaker amplifier via the MON provides no circuit component detail. Refer to the C960 Installation Instructions for more information. Configuration Switches RESET SWITCH: Very briefly, actuation of the. The auxiliary intercom may be a conventional, hard-wired intercom or it may be a second C960 base Monitor Speaker Audio Control station. RelaycontactsK303-B controldistribution ofmonitor External system components (speakers, microphone, speaker audio. Install the battery charger in a clean, dry environment. An office location is best.Refer to the installation instructions that are packaged with the assembly. Base Station 1. If a separate outside microphone is used, the auxiliary intercom must be configured for OUTSIDE MIC. These instructions are also located in the C960 Service Manual. A Cross-Lane Module can be useful if the manager wishes to operate each lane with a separate crew during periods of peak activity. It does not matter which base station is used to program the headsets. By pressing T1, the headset will always communicate with the lane 1 base station;. They also control which headsets to PAGE to.http://bfc-ltd.com/3m-soundpro-manual.xml
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Also, each of the headsets in the system must be reprogrammed when a jumper setting is changed (see Channel Selection on page 14 for the headset programming procedure). Microphone Lane 1 System Jumper pins 1 and 2 of jumper J3. Air Switch (Pulse) Detector Jumper pins 1 and 2 of jumper J4. Setting Audio Levels To set the audio levels, refer to the related audio level procedure below and to the illustration of the base station circuit board (Figure 14). Monitor Speaker Volume Levels The monitor speaker volume levels are the levels for the various functions heard through the optional monitor speaker. Base Station Circuit Board Jumpers J1 and J2 Set for the type of menu sign in the system. Jumper pins 1 and 2 on both jumpers for menu signs having a speaker only. Jumper pins 2 and 3 on both jumpers for menu signs having a speaker and a microphone. Adjustment Controls Controls the volume of the menu sign audio heard in the headset. MENU MIC SENS Controls the volume of the alert tone heard in the headset. Part Number Description Qty.78-6911-4492-3.HEADSET ASSEMBLY, Model C920AC. Part Number Description Qty.78-8095-0580-9.3-SLOT BATTERY CHARGER ASSEMBLY, Model C923AA. Part Number Description Qty.78-8095-0581-7.6-SLOT BATTERY CHARGER ASSEMBLY, Model C926AA. See Figure 3-2. Tools Required: 3. Remove the outer case and and the two keypads Phillips screwdriver and set them aside. See Figure 3-2. See Figure 3-3. Phillips screwdriver 5. See Figure 3-3. Tools Required: 4. Lift the battery release button spring out of the retainers in the housing. Possible causes are listed in the order in which they are most likely to happen. The intercom. plug in its power transformer. C960 system works OK. 3. The volume controls are set too 3. Turn the volume controls up.See Figure 4-1. Figure 4-2. Figure 4-1. 3. When the test is complete, the word READY will flash on the LCD. 2. Turn the battery charger ON. The analyzer will.http://mariondhuique-mayer.com/data/3m-speedglas-9002x-manual.xml However, three components Components are common to all system configurations. The base station is the interface between the customer at the menu sign and the Base Station headset worn by the operator. With the switch in the DAY position, the volume of the menu sign speaker is 3 VOLUME increased for daytime operation. Insert a dime in the slot on the headband pad housing and twist the dime to release the tab. Band Clip Figure 11. 5. Slide the cap clip over the inside half of the adjustable headband until it snaps into position over the headband pad mount. See Figure 12. Check to see that the POWER indicator lights. This mode is available with all system configurations. To page another operator, press and hold the page switch. Release the page switch to listen. To return to normal headset operation: 1. Turn the headset OFF. 2. Turn the headset ON. It is important to remember that an unused C960 battery loses five percent of its charge per week. If a batteries has not been used for several weeks, make sure to charge prior to use. See Figure 16. 2. Twist the dime to release the tab. Battery Charger Location The battery charger should be placed on a flat surface such as a desktop or table in a clean, dry environment. To help protect the environment, C960 rechargeable batteries which have Disposing of Batteries reached the end of their useful life should be disposed of in accordance with local requirements.In some cases, changing channels may have no effect.You can correct these types of interference by changing the base station operating channel.If the system has an optional monitor speaker, adjust its volume using the. Possible causes are listed in the order in which they are most likely to happen. The intercom. plug in its power transformer. C960 system works OK. 3. The volume controls are set too 3. Turn the volume controls up.Paul, MN 55144-1000 post-consumer waste paper. 78-6912-0671-4 Rev. G.http://www.drupalitalia.org/node/67015 The A121 will not function with an intercom system configured to use a single speaker as both the microphone and speaker. The LED can be off, blink at defined intervals, or be constantly lit. Table 3 illustrates the status indicated by the LED. System Requirements The 3M A125 Noise Reduction Module requires a C921BA Base Station. The LED can be off, blink at defined intervals, or be constantly lit. Table 3 illustrates the status indicated by the LEDs. With the exception of mounting, both circuit boards are the same. The Model A200 Loop Detector comes with a 12VDC plug-in power supply and is designed as a stand-alone loop detector. Be careful that the C921BA circuit board does not fall out of the plastic base. Four levels of sensitivity can be set with S1-1 and S1-2. The delay time is set with S1-3. The operating mode is set with S1-4. The music will resume playing at the menu speaker 2 minutes after the vehicle detect signal is disengaged. Note: Use this feature only with the 3M C921BA Base Station. When SW2 number 8 is OFF, the A300 message will be heard through the menu microphone while the message is being played through the menu speaker. A headset with a Dual-Lane Remote Switch can communicate with either base station in a cross-lane installation via the lane select switch. The Cross-Lane Module allows the headset to receive the vehicle alert tone and audio from a base station that the lane select switch is not set to. One base station must be jumpered (pins 1 and 2) for lane 1 operation; the other base station must be jumpered (pins 2 and 3) for lane 2 operation. Paul, Minnesota 55144- -1000 post-consumer waste paper. Paul, MN 55144-1000 post-consumer waste paper. 78-6912-0509-6 Rev. A. The communication bar can be mounted in one of two locations: On the outside wall of the building next to the face-to-face window. See Figure 2. For face-to-face window mounting, position the housing with the microphone at the bottom.http://artcustomdrums.com/images/3m-bookcheck-942-manual.pdf Note The wire exit hole in the housing is sized to accept a 1-inch conduit fitting. 8. Food Services Trade Department Printed in U.S.A. Printed on 50 recycled 3M Center waste paper, including 10 E3M 1996 July St. Paul, MN 55144-1000 78-6912-0581-5 Rev. B. Paul, MN 55144-1000 post-consumer waste paper. 78-6912-0596-3 Rev. C. Please review these instructions before you begin the installation. The instructions provided are general in nature, describing complete installation in a “typical”. A simple action, that will give the necessary initial idea about C960 device and help you avoid many problems with its further uses. Please note, that for a quality solution of possible problems, not enough only to read manuals - you should contact your nearest 3M official service center. Model C1060. Installation InstructionsTypical Single Lane Installation. Battery Charger. Speaker and Microphone Assemblies. Standard Systems. Duplex Systems. Base Station. Programming Station. Connecting the Base Station Directly to Components. Connecting the Base Station to Components Using the Optional Interconnect Module. Connecting the Auxiliary Intercom (Optional). Dual Lane System Installation. Cross Lane System Installation.Setting Audio Levels. Duplex Systems Only.Circuit Board Jumpers, Adjustment Controls, Indicators and Switches. Jumpers.Troubleshooting Audio Feedback. Technical Assistance.Figure 1. Typical Installation. Figure 3. Base Station Mounting Holes. Figure 4. Programming Station Mounting Holes. Figure 7. Connecting Components to the Interconnect Module.Figure 1. Typical Installation. Material Required (not supplied)ImportantInstall the battery charger and begin charging the batteries before you install any other components. Install the battery charger in a clean, dry environment. An office location is best. The battery charger may be placed on a flat surface such as a table, desk, etc., or it can be fastened to a wall usingThe three green lights on the battery charger will turn on. To charge a battery, plug it into the charger as shown in Figure 2. Observe the charging status indicator next toThe indicator lights RED to indicate the battery is charging. The indicator lights GREEN to indicate the battery is fully charged.This repeating tone continues for two minutes.Standard Systems. Duplex SystemsBase StationAt least 3 feet from large metal objects such as refrigerators, ranges, coolers, etc., and other metal orImportant. Do not mount base station under steel countertops, within 3 feet ofFigure 3. Base Station Mounting HolesKeep the transformer cable at least 6 inches from the left half of the base station. This half contains sensitiveAn 18 inch cable is provided to connect between the base station and the programming station. Important. Allow enough room below the programming station to allow insertion of theDo not mount programming station tooFigure 4. Programming Station Mounting HolesImportantModule. Connect the base station to the interconnect module as shown in Figure 6. Note that the connections are made toSupplied with Duplex Mic. Figure 7. Connecting Components to the Interconnect ModuleThe presence alert shown is wired to operate only when the Model C1060 is turned off. If a separate outside microphone is used, the auxiliary intercom must be configured for OUTSIDE MIC. Refer to the Auxiliary Intercom Installation Instructions for information about moving any internal jumpers.Dual Lane System Installation. A dual lane system consists of two separate single lane systems that operate independently of each other. EachTo install a dual lane system:Important. Base station models C921 and earlier must be mounted at least 25 feet apart. Base station models C922 may be mounted as close as 2 feet apart.This designates the base station as a lane 1 system.Important. Do not set both base stations to the same lane number as this will causeCross-Lane System Installation. The Cross-Lane system provides communication for facilities that have two menu signs. It consists of two baseA Cross-Lane Module is a five-pole switch that allows theRefer to the installation instructions (Document. These instructions are alsoA Cross-Lane Module can be useful if the manager wishes to operate each lane with a separate crew duringThis is accomplished by turning the Cross-Lane switch OFF. By pressing the T1Module is OFF, the operator will only hear the vehicle detector alert from the menu sign with which he or sheDuring periods of lower activity, the Cross-Lane Module is turned ON, allowing one headset order-taker toA single alert indicates a vehicle is at menu sign 1 while a double alert indicates aNotes: Both base stations must be set to the same channel number and different lane numbers. Base station models C921 and earlier must be mounted at least 25 feet apart. Base station models C922Test the system prior to installation by placing the baseSet Jumpers and program the headsets. Insure that the talk L.E.D. onWiring the System. Figure 11. Cross-Lane Wiring Diagram. Programming the Headsets for Cross-Lane Operation. Follow the steps below to program the headsets for Cross-Lane operation, and disable the Talk-Lock function. It does not matter which base station is used to program the headsets. By pressing T1, the headset will alwaysTalk-Lock is a toggle function that must be checked first to see if it is enabled or disabled. If the Talk LEDTo disable Talk-Lock, turn the headset OFF, press and hold the L button while pressing ON for 5The Talk LED on the base station should notWith the headset OFF, press and hold T1 and T2 while pressing ON for 5 seconds. You will hear anVerify that the headsets are properly programmed for Cross-Lane operation. Press T1 and verify that the Talk LED lights on the lane 1 base station and does not light on thePress T2 and verify that the Talk LED lights on the lane 2 base station and does not light on theTo remove the Cross-Lane function and return the headsets to the normal operating mode, first turn theYou will hear anOperation. Cross-Lane Module OFF. Vehicle detector alerts. The operator will only hear the vehicle detector alert from the menu sign with which he or she lastVehicles at menu sign 2 willAnswering customers. Pressing T1 will only allow communication with the lane 1 customer. Pressing T2 will only allowPaging function. Pressing T1 will only allow communication with other headsets, which recently pressed T1. Pressing. T2 will only allow communication with other headsets, which recently pressed T2. Cross-Lane Module ON. Vehicle detector alerts. The operator will always hear both vehicle detector alerts. Vehicles at menu sign 1 will be heard as aVehicles at menu sign 2 will be heard as a double repeating alert. Answering customers. Pressing T1 will only allow communication with the lane 1 customer. Pressing T2 will only allowPaging function. Pressing T1 will only allow communication with other headsets, which recently pressed T1. Pressing. T2 will only allow communication with other headsets, which recently pressed T2.The order-taker may object to hearing the vehicle alert from the other lane while taking an order; if so, weWith the AUDIO IN and AUDIO OUT wires disconnected, the T1 and T2 buttons control which menu signThey also control which headsets to PAGE to. Disconnecting the AUDIO IN and. AUDIO OUT wires presents some issues if a cook or cashier needs to monitor both lanes. If the cook or cashier is using a headset to monitor lane 1, and the order-taker is taking an order fromAs an alternative, a monitor speaker from each base station may be installed in the kitchen. (Caution. Monitor speakers are generally not recommended for duplex systems using C921AA base stations. TheC921BA and C922 base stationsWith the Cross-Lane module turned ON, two rapid single tones may be heard from the lane 1 base station. To eliminate this problem, turn down the volume of the ALERT TONE LEVEL control, on one of the baseImportant. Whenever a jumper setting is changed, the RESET SWITCH on the base station circuit board must be pressedAlso, each of the headsets in the system must beRefer to the base station circuit board illustration (Figure 14) and the applicable system configuration below. SetFunction. Menu Sign with Speaker only (OSM). Jumper Settings. Jumper pins 1 and 2 on jumpers J1 and J2.Menu Sign with Separate Speaker and. Microphone. Lane 1 SystemJumper pins 2 and 3 on jumpers J1 and J2. Air Switch (Pulse) Detector. Jumper pins 1 and 2 of jumper J4.Standard Operation. Menu Power Selection. Talk Monitor LevelJumper pins 2 and 3 of jumper J4. Jumper pins 2 and 3 of jumper J5. Jumper must cover the top 2 pins of jumper J6. Jumper left 2 pins of jumper J9. Jumper pins 1 and 2 of jumper J3. Function. Menu Sign with Speaker only (OSM). Jumper Settings. Jumper pins 1 and 2 on jumpers J1 and J2.Menu Sign with Separate Speaker and. Microphone. Lane 1 SystemJumper pins 2 and 3 on jumpers J1 and J2. Lane 2 System. Air Switch (Pulse) Detector. Jumper pins 2 and 3 on base station 2, jumper J3. Jumper pins 1 and 2 of jumper J4.Standard Operation. Menu Power SelectionJumper pins 2 and 3 of jumper J4. Jumper pins 2 and 3 of jumper J5. Jumper must cover the top 2 pins of jumper J6. Talk Monitor Level. Jumper left 2 pins of jumper J9. Jumper pins 1 and 2 on base station 1, jumper J3.Menu Sign with Separate Speaker and. Microphone. Jumper Settings. Jumper pins 2 and 3 on jumpers J1 and J2. Lane 1 System. Air Switch (Pulse) Detector. Jumper pins 1 and 2 of jumper J3. Jumper pins 1 and 2 of jumper J4.Duplex Operation. Menu Power SelectionJumper pins 2 and 3 of jumper J4. Jumper pins 1 and 2 of jumper J5. Jumper bottom 2 pins of jumper J6. Talk Monitor Level. Jumper left 2 pins of jumper J9.If customer desires, jumper right 2 pins ofJumper CRFT 2 pins when using a C1060Jumper right 2 pins for all configurationsSWT Threshold (High). SWT Threshold (NRML). Function. Menu Sign with Separate Speaker and. Microphone. Jumper Settings. Jumper pins 2 and 3 on jumpers J1 and J2. Lane 1 System. Jumper pins 1 and 2 on base station 1,Lane 2 System. Jumper pins 2 and 3 on base station 2,Air Switch (Pulse) Detector. Jumper pins 1 and 2 of jumper J4.Duplex Operation. Menu Power SelectionJumper pins 2 and 3 of jumper J4. Jumper pins 1 and 2 of jumper J5. Jumper bottom 2 pins of jumper J6. Talk Monitor Level. Jumper left 2 pins of jumper J9.If customer desires, jumper right 2 pins ofSelect a channel that neither receives or causes interference and then program the headsets to that channel usingImportant. After making any changes to the base station jumper settings, you must pressImportant. When two systems are used in a dual lane application, each base station mustIf you are installing this as a single lane system, 8 channels on the LANE 2 setting are alsoFigure 13. Base Station Circuit BoardRepeat the channel selection procedure if interference occurs. After seven channel changes, the original channelIf interference is still present and the system is a single lane system, try changing the. J3 lane designation jumper from lane 1 to lane 2. If this fails and none of the channels are interference free,Setting Audio Levels. To set the audio levels, refer to the related audio level procedure below and to the illustration of the base stationAll the audio level adjustment controls are located on the base station circuit board.The microphone at the menu sign must be located within four feet of the vehicle for duplexTo set the audio levels:Then turn the MENU MIC SENS level control down (CCW) until the feedbackVerify that feedbackIf everything is all right, the audio will be too loud.Duplex and Standard Systems. For Duplex systems, the microphone at the menu sign must be located within four feet of theThe following procedures apply to both duplex and standard systems. Alert Tone Level. The alert tone level is the volume of the alert tone heard in the headset. To set the alert tone level:When the vehicle is detected, you will hear the vehicleMonitor Speaker Volume Levels. The monitor speaker volume levels are the levels for the various functions heard through the optional monitorTurn the controls clockwise toTo set the monitor speaker volume levels:Adjust the MON TALKAdjust the MON PAGE control soIf any monitor functions are not desired by the customer, turn the related adjustment control fullyStandard Systems Only. The following procedures apply only to standard systems. Listen Level (Menu Sign Microphone Sensitivity). The listen level is the volume of the menu sign audio heard in the headset. To set the listen level:When the vehicle is detected, you will hear the vehicleThe Listen Level should now be properly adjusted.To set the menu sign talk volume level:Figure 14. Base Station Circuit Board. Jumpers. J1 and J2. Set for the type of menu sign in the system. Jumper pins 1 and 2 on both jumpers for menuJumper pins 2 and 3 on both jumpers for menu signs having aJumper pins 1 and 2 to select lane 1. Jumper pins 2 and 3 to select lane 2.Jumper pins 1 and 2 for an air switchJumper pins 2 and 3 for standardThis setting may cause feedback when a headset is operating near the monitorThis jumper is used to change the dynamic gainIt should normally be set to NRML. Occasionally, the inbound audio volume will decrease when C1060 headsets are used in Talk. Lock mode. Set jumper J10 to HIGH, in this case only. C1060 headsets are being used in Talk Lock mode. Important. After changing any jumper setting(s), be sure to press the RESET SWITCH onAdjustment ControlsControls the audio level coming from the menu sign.If any of the monitor functions are not desired by the customer, turn the appropriate adjustmentIndicatorsLit LED indicates which channel is selected for base station operation.Lights when a vehicle is detected at the menu sign.CHANNEL SELECT Switch. Programming Jack. RESET Switch. Controls power to the base station. Selects volume for day or night operation.Press to turn noiseSelects base station operating channel. For programming new channel selection or jumper setting(s) into theConnectors. C5000 Terminal StripNormal use and care of the system. Use and care of the headset. Battery replacement and recharging. Operation of the base station module switches and controls. Operation of optional Noise Reduction Module. Operation of Loop Detector. Refer to the Model C1060 Headset Intercom System Operating Instructions. Troubleshooting Audio Feedback. If audio feedback occurs, check the following and correct as necessary. Is the microphone audio wiring separately contained in its own cable, with no other “active” wires in theAre the speaker and microphone at least 14 inches apart? Is the outbound audio level too high? Is speaker audio being reflected back to the microphone from nearby surfaces? Technical AssistanceFood Service BusinessFood Services BusinessSt. Paul, MN 55144-1000. Printed in U.S.A.PDF Version: 1.3. Linearized: No. Create Date: 2003:10:29 15:18:01-06:00. Modify Date: 2003:10:29 15:18:01-06:00. Page Count: 29. Creation Date: 2003:10:29 21:18:01Z. Mod Date: 2003:10:29 21:18:01Z. Producer: Acrobat Distiller 5.0.5 (Windows). Author: US038009. Metadata Date: 2003:10:29 21:18:01Z. Creator: US038009. Title: Microsoft Word - C1060Ins.doc. We are taking extra precautions and following the recommendations of the CDC to ensure the safety and wellbeing of all our team members. Naturally, we want to help you do the same for yours. We are ready to help keep your drive-thru running smoothly, efficiently, and safely. Thank you for your continued business and allowing us the opportunity to serve you and your teams. Our technicians thoroughly check, repair, and upgrade to ensure like-new operation. Your purchase of these products includes a 4-month warranty. Please note that all refurbished items are subject to equipment availability. Advance Exchange Available. If not, proceed to program the C960 or C1060 headset. If all headsets fail to program or experience static, the base station may need to be replaced. Re-insert the power supply and allow the base station to initialize. Re-program all headsets to the new channel. Re-insert the power supply and allow the base station to initialize. If this is ON, toggle it to OFF. Re-insert the power supply and allow the base station to initialize. If this is ON, toggle it to OFF. Re-insert the power supply and allow the base station to initialize. If this is ON, toggle it to OFF. Verify that all wires on the phoenix connectors are docked securely. Re-insert the power supply and allow the base station to initialize. If this is ON, toggle it to OFF. Please do not factory reset a G5 base unless you are conferenced in with 3M on the line as they may end up giving you the code to enable both lanes or they'll replace the base. If the issues persists on the same communicator after testing all clean and charged batteries, proceed to replace the affected headset. If the green indicator light flashes briefly and then goes solid, registration is complete. If the issues persists on the same communicator after testing all clean and charged batteries, proceed to replace the affected headset. Press the ENTER button. Press the ENTER button. When the green indicator light stops flashing and goes solid, the headset is successfully registered. Remove any HS that are no longer in use (if the registration list is completely full). Make sure to hit the enter key on each space where a headset was removed, make sure you soft reset of the base station after the entries have been deleted. Attempt registration of headset after. The headset light should flash red and turn off. You can then attempt registration once more. Change NO to YES and press ENTER on next screen to restore the base to default settings. Clean contacts with an eraser or alcohol swab, if needed. Remove the battery from the assembled headset. A new message at the bottom of the screen should display if done correctly. One at a time, insert the battery back into the headset while watching the LED on the headset. Repeat powering on units until all have been registered. From the registration menu, select option 3. Change NO to YES and press ENTER on next screen to restore the base to default settings. Clean contacts with an eraser or alcohol swab, if needed. Page Count: 4 System Requirements The 3M A125 Noise Reduction Module requires a 3M model C921BA or C922AA Base Station. Installing the Noise Reduction board into the 3M Base Station 1. Remove the right-hand and left-hand top covers from th e 3M base station. 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 ci rcuit board when plugging in the A125 ribbon cable. 3. Position the holes near the edge of the A125 circu it board over the plastic standoffs on the base station. 4. Attach the left-hand base station cover after confi guring the A125 board, and performing the Final Checkout Procedure. Install the A125 board here Figure 1. Mounting the A125 to the C921BA Base Station The wider ribbon cable plug(s) are too wide to fit into the blue 20-pi n base station receptacle. The receptacle on the wireless base statio n board must be trimmed and the end s 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 com ponents 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 open ing 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 p lug(s) into the blue receptacle. Th e locking tab will not engage and should not be a problem. Noise Reduction: When DIP Switch number 1 ON the inbound microphone voice signal is digitized. On digitized, the noise is digitally removed from the voice by the digital signal processor and converted back to an analog voice signal. The analog voice signal is then sent to the m icrophone input of the intercom. When DIP Switch number 1 is OFF the inbound m icrophone voice signal is digi tized and converted back to an analog voice signal without removing any noise. The analog voi ce signal is then sent to the microphone input of the intercom. Echo Reduction: Used to reduce echo for full-duplex intercom configurations. Turn Echo R eduction OFF for half-duplex intercom configuration. When DIP Switch num ber 3 is ON, the board i s set for truck stop noise reduction level. This provides approximately 6dB m ore noise reduction with slightly more voice dedegration. Hi Frequency Equalization: When DIP Switch number 4 is ON, the higher end frequencies are increased by 3dB. This should be set to the customer’s preference.The LED can be off, blink at defined intervals, or be constantly lit. Table 3 illustrates the status indicated by the LEDs. The red LED should bli nk slowly.