HM Electronics 400 Base Station, Model SYS 400 User Manual
HM Electronics Inc Base Station, Model SYS 400
user Manual
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| Document ID | 8840 |
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| Document Description | user Manual |
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| Document Type | User Manual |
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| Filesize | 60.78kB (759771 bits) |
| Date Submitted | 1998-10-02 00:00:00 |
| Date Available | 2001-03-19 00:00:00 |
| Creation Date | 1998-09-29 14:43:40 |
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| Document Lastmod | 1998-09-29 14:45:07 |
| Document Title | user Manual |
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TUV Apy (5 y , "mum USER MANUAL ‘ ' TUV PRODUCT SEFWICE 10040 Mesa Rim Road San Diego, CA 92121-2912 Phone 619 546 3999 FAX 619 546 0364 svswm mm HMmeum Hw— DRAFT System 400 Wireless Audio System Operating Instructions (For Full-Duplex and Half-Duplex Operations) HM ELECTRONICS, INC. Table of Contents A Main Components .............................................. B. Controls. Switches. Connectors and Indicator Lights ................... 1. Base Station ......... . 2. COMMUNICATOR” . Ill. EQUIPMENT CARE AND USE AA Using the Batteries and Battery Charger ............................. B. Wearing the COMMUNICATOR' C, Using the COMMUNICATOR' ..................................... . HOW TO and HOW NOT TO handle the Headset Cable and Connector . . . , A How to Clean the COMMUNICATORo ............................... IV4 NORMAL SYSTEM 400 OPERATION ................................... Single Drive-Thru Lane, Full-Duplex Operation ........................ Single Drive-Thru Lane. Half-Duplex Operation ....................... Dual Drive-Thru. Full-Duplex Operation Dual Drive-Thru, Halt-Duplex Operation 4 . Message Repeater Operation .................................... rnrflpol'flP Speed-Team Operation ......................................... Gr Remote Display Operation ....................................... VI. SPECIFICATIONS ............... VII. ACCESSORIES AND OPTIONAL EQUIPMENT . VIIL FCC NOTICE .................................................... The HME and the word COMMUNICA TOH' are I ‘stered trademarks or HM Electronics, Inc by" Copyright HM Elschonlcs, luggi— Septembe List of Figures Figure Title ' Page 1 System 400 Base Station ......................................... 1 2 AC420 Battery Charger ........................................... 1 3 COM420 COMMUNICATOR“ ...................................... 1 4 Base station leatures ........ y ..................................... 2 5 Communicator controls, connector and indicator light ................... 3 6 Installing the battery .......... 7 Opening the battery compartment ................................... 4 8 A properly installed battery in the battery charger ...................... 5 9 Plug the earpiece/microphone cable into the cable receptacle ............ 6 10 insert belt through belt loop on back of Communicator pouch ............. 6 1 1 Correct wearing of Communicator headset ............................ 7 12 Communicator pushbutton controls ............................. 7 (0 Base station circuit boards .............. GENERAL The System 400 is a wireless audio system primarily for use at quick-service restaurants. EQUIPMENT IDENTIFICATION A. Main Components 0 System 400 Base Station 0' AC420 Battery Charger l COM420 COMMUNICATORo (includes belt and pouch plus one spare battery) . Figure 2. System 400 Base Station AC420 Battery Charger COM420 COMMUNICATOR” B. Controls, Switches, Connectors and Indicator Lights 1. Base Station Front - System indicator lights 0 POWER light is on when the base station has power. 0 MESSAGE RECORD light is on when the base station is ready to record a message for the message repeater, and blinking while a mes- sage is being recorded. The MESSAGE REPEATER button must be IN. 0 RECEIVE light is used only for troubleshooting, but is also on during channel-A and channel-B transmissions. “A” light is on during channel-A transmission. ' “B" light is on during channel-B transmission. 0 VEHICLE light is on when a vehicle is present in the drive-thru lane or when the system is in vehicle-detect override. Bottom — o PUSH FOR RECORD MODE button; must be pushed 1N and released to prepare the base station to record a message for the message repeater o MESSAGE REPEATER button: must be IN to use the message repeater, OUT when the message repeater is not being used. 0 SPEED TEAM button; must be N for speed-team operation. OUT for normal drive-thru operation 0 VEHICLE DETECTOR button; to override a vehicle detector, push and leave IN: to reset vehicle detector, push [N and leave In for 5 seconds. then push again and leave OUT for non'nal vehicle detection Left Side - o WIRED/WIRELESS button; must be OUT when using the wireless System 400, IN when using a wired backup system. ., Transmitter Receiver antenna antenna = mu 4 1..."- i_.-..m- mummies cum Figure 4. Base station features 2. COMIVIUNICATOR1° Figure 5. Communicator controls, connector and indicator light 1 — OFF/ON button: turns Communicator on and olt. 2 - Volume control buttons: adjust listening level in earpiece. 3 — Power-on light: lights when power goes on. and remains Iit until battery needs replacing or Communicator is turned oil. The power-on light blinks when transmitting on “A" or “B" channel. 4 — Buttons A a B: Button “A“ allows two-way communication when pushed and held; when it is released, me user can listen only. Button “8" must be pushed and held to talk, and released to listen. The two buttons are in convenient positions whether Communicator is worn on left or right hip. 5 - Button 0: switches from one base station to another in systems with two base stations. 6 — 5-pin DlN receptacle: receptacle for earpiece/microphone cable connector. 7 - Battery: provldes power for the wireless belt-pao Communicator. 8 — Battery release latch: slides to release battery for removal. and snaps in place when a battery is inserted to secure battery in Communicator. 3. Battery Charger (See Figure B on page 5,) Top — Fled lights indicate that batteries below the lights are charging. Green Ilghts indicate that batteries below the lights are iuIIy charged. Back — Ac adapter connector is for connecting AC adapter cable to battery charger. IH. NORMAL OPERATION AND USE A. Using the Batteries and Battery Charger Before operating your COMMUNICATOR“. be certain you have a fully charged NiCd battery. Place it in the Communicator as instructed below. 1. Installing and removing Communicator batteries 0 Install a lully charged NiCd battery in the battery compartment with the arrow on the battery pointing out as shown in Figure 64 Slide it into the tracks on both sides of the compartment until its catch clicks securely in place Figure 6. Installing the battery 0 To remove the battery from a Communicator, slide the battery latch open and push the battery in the direction of the large arrow on the battery as shown in Figure 7. Figure 7. Opening the battery compartment 2. When to replace batteriu When a good battery is in the COMMUNICATOR‘ and the power is on, the red light on top of the unit will be lit. This light only indicates the power is on. It does not indicate how much power is left in the battery. As a battery weakens during routine use. you will hear a repeating beep in the earpiece, indicating the battery needs to be replaced. Typical battery Iile with normal use is 8 to 10 hours. CAUTION: Turn Communicator OFF before removing batteries ! To prevent damage. turn the Communicator OFF before removing or installing batteries. - Charging NiCd batteries with the battery charger Your battery charger should be used in a low-traffic area, away from dust or splashing water and grease. Il your battery charger is not already plugged in, remove the AC adapter from its box and plug its cord into me connector on the back of the battery charger case. Plug the adapter into an AC electrical outlet. Place up to four batteries in the charger to charge at the same time, as shown in Figure 8. As each battery is placed in the charger, the red CHARGING light on the panel adjacent to the battery will light, indicating it is charging. it the red light flashes When the battery is installed, the battery may be defective. If this happens, remove the battery and re-insert it in another compartment. It the red light flashes again, the battery is defective and needs to be replaced. When a battery is fully charged, the green READY light on the panel adjacent to it will light. (approximately 4 hours) It can then be placed back into a Communicator. CAU710N: Do not remove batteries from fire charger until the green READY light Is lit or the red light Is flashing, or the charger will reset and the charge cycle will begin again. NiCd battery A properly installed battery In the battery charger B. Wearing the COMMUNICATORQ Plug me headset-cable connector into the receptacle on the Communicator as shown in Figure 9. The connector is keyed so it can only be inserted in the correct position, with the cord extending downward. Loosen the snap on the cord protection flap and resnap it with the llap over the cord. Figure 9. Plug the headset-cable connector into the cable receptacle insert the Communicator belt through the loop on back of the Communicator pouch as shown in Figure 10, and fasten the belt securely around your waist The Communicator can be worn over either your right or Ielt hip. Figure ll). Imert belt through belt loop on back of Communicator pouch Put the headset on your head and clip one of the clothing clips to your collar as shown in Figure 11. Clip the other clothing clip to the back of your shirt, above your waist. Position the microphone approximately 2 inches (50.8 mm) from your mouth. Correct wearing of the Communicator headset C. Using the COMMUNICATOR” Turn the Communicator on by pressing the ON/OFF button. Be certain the red power light goes on when the Communicator is turned on. If the power light does not go on, the battery (or batteries) must be changed. Push and hold either the “A" or “B" button on top of the Communicator and speak into the microphone. You should hear your own voice in the earpiece. Adiust the volume control on the Communicator to a comfortable listening level. When you have finished talking, release the button immediately. On/Off button Volume control buttons -noo[ Red 'A' 'B' 'C' Power-on button button button light Figure 12. Communicator pushbutton controls NOTE: if other than an HME earpiece/microphone or headset will be used with the Communicator, be certain it has an electret microphone with an impedance of 10002000 ohms. D. HOW TO and HOW NOT TO handle the Headset Cable and Connector ALWAYS Align the connector key and pins with key and holes in the receptacle when plugging the headset into the Communicator. Fasten cable to pouch with strain relief strap. Clip the cable to your clothing with the Twist headset connector into Communicator receptacle. Allow cable to be stressed at connector. Allow cable to hang treely. clothing clips. Grasp and pull cable to unplug headset. Grasp the connector to plug in or unplug the Remove headset with oni one hand. headset. y Adiust microphone position with only one Use both hands to remove the headset from hand. your head. _ > Full, twist. bend or knot the headset cable. Use both hands to adjust the microphone position. Carry or hang the headset by its cable. Handle the headset cable with care. Carry and hang the headset by its metal headband. How to Clean the COMMUNICATOR® The following cleaning procedure is recommended at least once each month. 0 Remove the Communicator from the pouch. 0 Remove the battery from the Communicator. 0 Wash the belt and pouch in a washing machine with normal laundry detergent. Dry them in a dryer or hang them up to dry. 0 Clean the Communicator with a damp sponge. Wet the sponge and wring it out so it is damp. not dripping wet. Spray household cleaner on the sponge (NOT DIRECTLY ON THE EQUIPMENT). Clean the Communicator with the ' sponge, and dry it throughly. - Clean the metal battery contacts on the battery with alcohol on a cotton swab. Wet the tip of the swab with alcohol and squeeze the excess alcohol from it. Wipe each contact with the swab. and be certain all the contacts are dry before installing the batteries. 0 Place the battery back in the Communicator. and place the Communicator back in the pouch. fastening the strap securely over It. 0 Clean the headset and cable with a damp sponge sprayed with houshold cleaner. The foam muff on the headset earpiece is easily replaced for sanitary purposes. To order extra foam muffs. call your local HME sales representative. IV. OPERATION in single or dual drive-thru operations, COMMUNICATOR” button ”A" is for communication with the customer. and button 'B‘ is for communication with other crew members wearing Communicators. In dual drive-thru operations, the Communicator button “0“ is used to switch between Lanes 1 and 2. Button "C" has no function in single drive—thru operations. A. Single Drive-Thru Lane, Full-Duplex Operation acrlon RESULT ll you are using the Communicator latching lealure: Press and release button "A" to latch communication channel open for speaking and lislening to customer. The channel will unlalch. ending communication with the customer, if; you press and release button 'A" again. or you press button "B.“ or you turn off the Communicator. or the customer drives away, or after 10 minutes at continuous latched communication. Customer hears your voice and you hear customer’s voice (twoway conversation). Operation is ‘hands~tree" until the customer pulls away. Everyone wearing a Communicator hears the communication. P'Pfe’l“? If you are not using the Communicator latching feature: Press and hold button 'A' while speaking and listening to customer, Release when transaction is completed. While customer is speaking. press the '+' or ‘-' Beep tones of increasing/decreasing frequency are arrow to adjust volume level, heard in headset as volume level increases! decreases. Customer's voice becomes louder or softer. Press and hold button “5“ to speak to other crew members wearing Communicators. Release to listen. Other personnel wearing Communicators hear your voice in their headsets. B. Single Drive-Thru Lane, Half-Duplex Operation acrlon RESULT Press and hold button 'A' while speaking to Customer hears your voice. Everyone wearing a customer. Communloator hears the communication. Release button 'A' and Ilslen to customer. Customer's voice is heard in headsets cl everyone wearing a Communicator. While customer is speaking. press the '+' or '-' Beep tones of increasing/decreasing frequency are arrow to adjust volume level. heard in headset as volume level increases/decreases. Customer's voice becomes louder or softer. Press and hold button 'B' to speak to other crew Other personnel wearing Communicators hear your members wearing Communicators. Release to listen. voice in their headsets, C. Dual Drive-Thru, Full-Duplex Operation ACTION HESUL T It you are using the COMMUNICATOR“ latching feature: Press and release button 'A' to latch cornmuni» cation channel open lor speaking and listening to customer in Lane 1 or2. The channel will unlatch it. you press and release button 'A' again, or you press button 'B', or you press button 'C', or you turn elf the Communicator, or the customer drives away. or A .. after 10 minutes of centinuous communication. it you are not using the communicator latching lecture: Press and hold button 'A' while speaking and listening to a onstorner in Lane 1 or 2. Release when the transaction is completed. Customer hears your voice and you hear customer‘s voice (two-way conversation). Operation is 'hands- lree' until the customer pulls away. Everyone wearing a Communicator hears the communication, NOTE: When transmitting in Lane 1 operation, the Communicator power light will blink rapidly. When transmitting in Lane 2 operation. the Communicator power light will blink rapidly 4 times. then pause and repeat. Refer to page 3, section 2 for further explanation. “93‘9’Nr' Lanes 1 and 2 have dlfferent sounding vehicle-present tones. While customer is speaking, press the '+' or '—' Beep tones of increasing/decreasing frequency are arrow to adiust volume level. heard in headset as volume level increases! decreases. Customer‘s voice becomes louder or softer. Press button ‘C' to switch to the other Iene. You can begin speaking and listening to the customer In the other lane. Press and hold button 'B' to speak to other crew Other personnel wearing Communicators hear your members wearing Communicators. Release to listen. voice in their headsets. fl D. Dual Drive-Thru, Half-Duplex Operation ACTION - RESULT Press and hold button 'A' while speaking to Customer hears your voice. Everyone wearing customer in Lane 1 or 2. Communicators hears the communication. Release button and listen to customer. Customer's voice is heard in headsets of everyone wearing Communicators. While customer is speaking. press the '+' or '—' Beep tones of increasing/decreasing lrequency are arrow to adjust volume level. heard in headset as volume level increases] decreases. Customer's volce becomes louder or setter. Press button 'C' to switch to the other lane. You can begin speaking and listening to the customer In the other lane. Press and hold button “3“ m speak to other crew Other personnel wearing Communicators hear your members wearing Communicators. Release to listen. voice in their headsets. E. Message Repeater Operation ACTION RESULT Press the ME$AGE REPEATEFI button IN on the System 400 base station and do the following. Press and release the red RECORD MODE button The MESSAGE RECORD light on the System 400 on the System 400 base station. base station will come on. Press and hold button ‘8' on the Communicator and The MESSAGE RECORD light on the System 400 talk into the headset microphone to record a base station will begin blinking. message (15 second maximum). . Release button 'B.‘ The record lunctlon will stop and the light will go off. After a new message has been recorded. or alter the base station has lost and regained power, the message will always be heard in the Communicator headset the first three times it plays. 10 Speed-Team Operation Speed-team operation is used during high-volume times. An order taker wearing a belt-par: relays orders from outside into the store using the "B" channel on the COMMUNICATOR‘. Placing the SPEED TEAM switch in the ON (in) position will disable me speaker and microphone in the speaker post or menu board. and will also disable the vehicle tone and alert tone from the timer. Remote Display Operation One or more R30 Remote Displays may be used with your System 400. Each remote display was set up by the installer to show the amount of time the current car has been at the menu board. speaker post or service window. A remote display shows the time for one location only. lt begins counting when the car arrives and stops when the car leaves. The remote displays will only display time. They will not store or record information. 11 V. IN CASE OF PROBLEMS (Refer to the circuit board illustration on page 14) TROUBLESHOOTING CHECKLIST Power is off at base station. Check circuit breaker for building Power supply in base station is not Check power supply indicator working. lights on base station. Ii any light is not lit. be certain AC power adapter is plugged into AC electrical outlet. and connected to J2 connector on audio circuit board in base station. No sound in headset when you press COMMUNICATOH' button 'A' and speak into headset microphone. Communicator not turned on. Turn Communicator on by pushing ON/OFF button ior 1 second Be certain light goes on. Volume not set correctly. Push volume—control buttons to adjust volume. Headset connector not plugged iirmly into Communicator. Plug headset connector tirmly into Communicator receptacle. Headset detective. Replace with another headset, Low or dead battery. Check ON/POWEH light. it not lit, replace battery. : ommunicator failed. Use another Communicator. Cell HME. ' Dead or weak battery. Replace battery. Communicator or base station Use another Communicator. failure, Channel 'A' or 'B' light Call HME. * and RECEIVE light on base station do not light when Communicator button 'A‘ or ‘B' is pressed. Communicator channel ‘A' or 'B' iunctions not working 'C' button does not switch between channels in a dual-lane drive-thru. Outbound sound too low. S'witch setting on Communicator incorrect. Check 81 switch. Switch #5 should be ON. Outbound volume set too low for environment. Turn outside speaker volume control (R128 in base station) clockwise with small standard (slotted) screwdriver until level is satisfactory. Be certain SPEED TEAM button on base station is out (OFF), No outbound sound; customer cannot hear anything. System may be set tor speed- taam operation, Loose wires on base station circuit board. Detective speaker or base station. Check speaker wire connections on switcher circuit board. Call HME. ' ' For assistance, call HME at 1-800-848-4468. or Fax 619-552-0172. 12 Problem Probable Cause Latching feature may be on. System may be set for speed- team operation. Base station may be set for wrong drivethru mode (full or half-duplex). No inbound sound lrorn customer (in halt—duplex operation) Check S1 switch on Communicator. Switch #4 should be OFF. Be certain SPEED TEAM button on base station is out (OFF). Check S6 switch on base station circuit board. Switch #1 should be ON tor full—duplex OFF for haliouplex Tighten transmitter antenna connection. (the antenna on top. left 01 base station.) No power to base station. Check base station power adapter connections. Circuit board detective. Call HME. " Receiver antenna connection on Tighten receiver antenna base station is loose. connection. (the antenna on top, right of base station.) Status lights are not lit. Circuit Call HME. ' board is detective. Defective COMMUNICATOR. or Call HME. ' headset. Power interruption has caused When no vehicle is in the drive- unbalanced detecting circult. thru lane. press vehicle detector override switch on base station to RESET position, then back to NORMAL position. Be certain SPEED TEAM button on base station is out (OFF). Personnel hear static only ‘in headsets. Transmitter antenna connection on base station is loose. Personnel hear customer in headsets or ceiling speaker, but cannot near each other. No tone or sound in headset or ceiling speaker when vehicle drives into drive—thru lane. System may be set tor speed- team operation. See page 7, paragraph F. Connector may be loose. Check all connectors. Call HME. ' Loose wires on base station circuit Be certain wires are securely board connector. connected in base station. System may be set for speed- Be certain SPEED TEAM button on team operation. base station is out (OFF). Outside speaker or audio circuit Call HME. " board has felled. Detective headset cable. Use another headset. Call HME. ‘ OVERRIDEIRESEI'. NORMAL Place switch In the NORMAL switch on base station is in the position. OVERHlDEIRESET position. Vehicle detector is locked up. Press OVERRIDE/RESEI' switch twice Battery charger not Charger not plugged in. Plug in battery charger. working. it still not working. call HME. ' Can not record message. Message repeater not turned on. Turn message repeater on. Message will not play. ' For assistance. call HME at 1—800-8484468. or Fax 619-552-0172. Personnel cannot hear outside customers in headset or ceiling speaker. Communicator has intermittent sound. Headset does not become silent after customer has driven away. 13 . o O ‘ O o M n Inna-c!- ° Clrcuii an d 0 m; switch mun only be in he OUT position when using a DMI Miclophcne. ° will?“ 5 "E 55 T O T lm as E E n a 1— Figure 13. Base station circuit boards A - Transmitter antenna connecwr B - Receiver antenna connecior C - DM1 select switch D - Frequency selem switch - SW1 E - Record message switch -sz F - Message repeater ONIOFF switch -53 G - Speedteam switch - 55 H - Vehicle detamor override swilch - $7 I - Power and ceiling speaker connector - J2 L - Ceiling speaker volume control - H142 M - Inbound volume control - R48 N » Automatic test equipment (ATE) connector - J1 0 - Message record LED - 037 P - Receiver LED - D81 0 - ChanneIA&BLEDs - DS4,DSS R - Vehicle present LED- use 5 - Vehicle present lone volume control - R160 T - System configuration switches - 36,38 U - Base-tcbase connector (for dual drive-lhru operalions) - J9 J - Outside speaker volume control - R123 K - Power supply LEDs, 1SVAC -Dss 14 VI. SPECIFICATIONS Base Station 1. Voltage input 2. AC current input 3. Audio distortion 4. Outside speaker output 5. Ceiling speaker power 6. Message repeater 7. Controls/Switches 8. TXIRX Frequency 9. Dimensions 10. Weight Battery Charger Voltage input: AC current input: Number of charge ports: Charge time: Dimensions: Weight: Indicators: NP’P'PWNT‘ COMMUNIGATOR0 Battery (NiCd) HF Frequency Dimensions Weight Controls 97> W9.“ Nr‘ Indicator 7. Connector 16VAC i2.5V SSDmA nominal. 1.4A maximum <5% maximum level 3 watts RMS into 8 ohms 3 watts HMS into 8 ohms Message duration » 16 seconds " 2-position vehicle detector switch (Normal - Override/Reset) 2-position "Speed Team" ON/OFF switch 2-position “Message Repeater" ON/OFF switch 1-position “Record" switch 4»posi’tion RS485 bias/term switch Outside speaker volume control Outside speaker Hi-Lo volume jumper Vehicle present tone level control “A" sidetone “B" sidetone inbound volume control VAA level control Ceiling speaker volume control Vehicle present tone volume control (3) B-position DIP switches 4-position frequency select switch Wireless/wired system select switch Horn speaker/DM1 select switch FCC Part 90 8.2'H x 14.2'W x 3.5‘D (208mm x 361 mm x 89mm) 5.5 lbs (2.49kg) maximum 1 6.5VAC 1.2A maximum at 16.5VAC 4-8 hours B'L x12'W x 350 (203mm x 305mm x 89mm) 1.5 lb (0.69 kg) - not including AC adapter Battery-charging (red) L533, 4 ea Battery-ready (green) LEDs, 4 ea 8-10 hours Receive — FCC Part 90 Transmit —— FCC Part 90 3%‘H x 4‘/x'W x 1‘/z'D (86mm x 114mm x 38mm) 11 ounces (3.12kg) —— including battery Buttons “A! "B“ and “C' PowerNolume control Red LED Solid when receiving only. Blinking when transmitter is activated. 5-pln DIN 15 VII. ACCESSORIES AND OPTIONAL EQUIPMENT The following optional equipment is available for use with your System 400. To order any of these products, call the HME Sales Department at (619) 5355060. Equipment Model Number COMMUNICATOR ' COM420 Battery. Spare for COM420 Headset Earmuff Earplece/Micrcphone DU2/DU3 Ultrasonic Vehicle Detector Vehicle Detector Board VDB‘IO1 Vehicle Detector Loop (underground) VDL100 Message Repeater MRiDOA Hemmeoiw winemaker mm- Variable. Low-Profile Speaker MM2500 i 1? V111. FCC NOTICE HME wireless radio frequency systems are type-accepted in the United States under Part 90 of the Federal Communications Commission (FOO) Code of Federal Regulations, and type- approved in Canada by Industry and Science Canada. Because licensing depends on the system's application, it is the user's responsibility to apply for a license from the FCC in the U S and its possessions, or from Industry and Science Canada in Canada and its territories. Licensing requirements vary from country to country. Contact your local licensing agency for specific requirements 5. This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) This device must accept any interference received, Including interference that may cause undesired operation. NOTE: Thls equipment has been tested and found to comply with the limits tor a Class A digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to radio communication. Operation of this equipment in a residential area is likely to cause harmful interference. in which case the user will be required to correct the interference at his own expense. Changes or modifications notiexpressly approved by HM Electronics, Inc. could void the users authority to operate this equipment. 16
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