S3750THS USER GUIDE
Contents
1. ESC z nl n2 L data Print Bar Code without visible text 3 7 7 Printer Supervisory and Control Commands ESC P alpha ESC M nn0 Cr Resident Character Sets characters 32 through 255 Clul jal laj lc li l f lA A 22 jet li gt Sis Gg TAAA e ewaeY5zaAimnexaisiv E E EVI I OLB lolal lu e T 101 YE l p flo o GTI i t X RICO 7 10 1 2 3 4 5 617 8 JA B C D JE F fG H T J K L M IN O P Q R S T U V W E le P p PC Line Draw Character Set Page 17 4 Printer Maintenance 4 1 Cleaning You may need to clean the print head and platen roller after printing a number of rolls of paper whenever you load new supplies or when you see voids in the printout A Caution Do not use sharp objects to clean the print head This may damage the printer and require service Open the paper door by pulling the T bar lever on the top cover as shown in Figure 3 The paper supply door will pop up Remove the paper roll Moisten a cotton swab with isopropyl alcohol and clean the print head Clean the platen roller with a dry cloth or small brush Note You can also use another cotton swab moistened with isopropyl alcohol Turn the platen roller with your finger and run the cotton swab or dry cloth across it Make sure the platen roller is clean all the way around Moisten another cotton swab with isopropyl alcohol Rub the swab across the black mar2. regulation and or standards FCC Part 15 Subpart B Class B po CE EN60950 CE EN55022 Class B CE EN61000 3 2 CE EN61000 3 3 CE EN50024 Supplementary Information The product complies with EMC Directive 89 336 EEC and Low Voltage Directive 73 23 EEC The product conforms to ANSI UL STD 60950 amp Certified to CAN CSA STD C22 2 No 60950 00 CB Certified ETL Listed control 3046813 The product is IEC 68 certified Waltham MA USA O Antony Revis General Manager Page 3 General Precautions Before using this product be sure to read through this manual After reading please keep the manual in a safe place for future reference The information contained herein is subject to change without notice of any type Extech is not responsible for any operational results regardless of missing information errors or any misprinting in this manual Extech is not responsible for problems created as a result of using options and consumables not approved by them This product is designed for servicing at an Authorized Service Center Other than routine maintenance described in this manual the user should not attempt to repair service or disassemble this product Incorrect operation handling or improper operating environments may cause damage or otherwise affect the proper operation of this product Such actions invalidate the product warranty In this manual and on the Printer and accessories we make use of internationally
3. 7 4VDC 1800mA Input 120VAC Output 10VDC 1 4A US Plug Input 220VAC Output 10VDC 1 4A Euro Plug 157240 Battery charger adapter 3750T Input 240VAC Output 10VDC 1 4A UK Plug Available from Extech Email Windows 95 98 NT 2000 Drivers printers extech com Download Windows CE print Utility http www fieldsoftware com PrinterCE htm Download Palm Pilot print Utility http www stevenscreek com pilot dodownload html 756998 Belt Loop System 5892RJD9 Serial Data Cable RJ to DB9 PC compatible Page 21 5 Specifications 5 1 Printer Specifications Power S Power 7 4 V Li Ion battery Operating Temp Limits 41F to 104F 5 to 40C Storage Temp Limits Storage Temp Limits 4F to 140F 20C to 60C Operating Humidity Limits 2096 to 8596 non condensing Storage Humidity Limits 5 to 95 non condensing 203 dpi 8 dots per mm Printing Method Thermal Direct Print Speed Up to 2 0 inches per second Supported Fonts Bitmap Standard normal and bold Large normal Reduced normal and bold Large rotated Codabar Code 39 UCC EAN 128 UPC EAN JAN Interleaved 2 of 5 Code 128 PDF 417 224K Fonts and Logos Flash Charging Time Approximately 180 minutes RS 232 port IrDA BT 802 11b Print Ratio 5 2 Supply Specifications 2596 black maximum sq in Supplies Thermal direct receipt paper Supply Thickness 2 2 to 3 5 mils receipt paper Supply Width Suppl
4. 802 11b or a BLuetooth Module installed the printer will enter that state respectively Pressing the power lt On Off gt switch again will turn the printer OFF Note It is necessary for the mobile computing device you are using to discover the printer Refer to instructions provided by the systems integrator Note Systems Integrators Refer to the Bluetooth manual provided with your mobile computer and the Bluetooth section of the Developer s Manual 802 11b Application Note available for this printer 3 6 Using the Magnetic Stripe Reader The Magnetic Card Reader is a factory installed option This option requires special application software to read and process cards with a magnetic stripe such as credit cards or driver s license Note Refer to the Figure 4 if your printer is equipped with the optional magnetic stripe reader Quickly swipe the card through the reader either left to right or right to left The magnetic stripe must be facing toward the paper supply door as indicated below while it is passed through the reader Refer to Table 4 for the description of the LED indicator Status LED indicator State Green ON Ready waiting for card to be swiped OFF Good swipe Card data read OR Card not ready to be swiped Red ON UG Error reading card s data Table 4 Magnetic Card LED Indicator Page 14 LED indicator Figure 4 Using the Magnetic Card Reader 3 7 Programming Infor
5. Note The customer is responsible for ensuring proper packing to prevent damage in transit as well as the shipping costs back to Extech it will be repaired estimates are provided first if the repair cost is estimated above 100 00 and returned via UPS ground The customer may elect a faster mode of transport at their cost Page 24
6. RI DATA CONNECTOR SHOWING PIN LOCATIONS FRONT VIEW fake 35 RJ DATA CONNECTOR RJ25 CONNECTOR PIN FUNCTIONAL DESCRIPTION SIGNAL NAME RS232 from Host INPUT R5232 from Printer OUTPUT Clear to send from Printer OUTPUT 3750T Printers Serial RS232C Interface signals RXD CTS OM ML n Request to send from Host RTS INPUT Page 13 3 4 Infrared Communications Mode IrDA Only Dip Switch 1 and 2 must be in the ON position The printer can be powered up by pressing the power lt On Off gt switch fnolrDA connection is made the printer will automatically power down to a lower power level to conserve battery life It will remain in a sleep mode until an IrDA connection is made at which time the printer will wake up and print the requested data Pressing the power switch again will turn the printer OFF 3 5 Bluetooth 802 11b Communications Only Option Dip Switch 1 must be in the OFF position Dip Switch 2 and 3 must be in the ON position Note Since UART 1 RS232 and UART 2 IrDA BT 802 11b share the same Dip Switches the same baud rate parity and stop bits settings apply both for RS 232 and BlueTooth 802 11 Refer to Developer s Manual for further details Note Adjust settings to match those of the BT or 802 11b module in your computing device The printer can be powered up by pressing the power lt On Off gt switch Depending on Whether you have an
7. EXTECH INSTRUMENTS S3750THS USER GUIDE PN le Fab ae ee VERSION 1 1 DATE July 1 2004 Page 1 Table of Contents Getting Started Declaration of Conformity 1 J 3 General Precautions al Safety Note 3 4 O 4 1 1 Unpacking the printer 5l Installing and Charging the Batter 5 Reading the LED Status KA 1 4 Attaching Belt Loop System 8 Loading Supplies Adding Paper Labels 8 9 Tearing Paper Suppl Using the Printer 3 2 Connecting the Printer 11 3 3 Communications SerialRS232C 13 3 4 Communications IrDA 3 5 Communications Bluetooth o o o 14 3 6 Using the Magnetic Card Reader 14 Printer Maintenance 4 1 4 7 Printer Supplies Specifications Printer Specifications Supply Specifications 5 3 Regulatory Notes Page 2 Provisional Declaration of Conformity Extech Instruments Corporation Telephone 1 781 890 7440 Declares that the Product Model Number S3750THS Optionally Containing 1 Bluetooth radio short range OEM module from connectBlue ab cB 0701 01 FCC ID PVH 070101 Conforms to R amp TTE Directives 1999 5 EC EN 300 328 2 EMC Directive 89 336 EEC EN 301 489 1 and 17 and Low Voltage Directive 73 23 EEC EN 61131 2 3 802 11 Wi Fi Module Conforms to the following
8. battery as shown The battery side with two contact terminals should be facing down to make contact with the two spring probes inside the battery compartment Close the battery door Lock the battery door by sliding the battery door locking tab up Page 5 Figure 1 Installing the Battery Cartridge 1 2 2 Charging the Battery Charge the battery by inserting the wall mounted charger line cord into the printer jack Then insert the charger plug into an appropriate wall socket The Yellow Amber charging LED will illuminate indicating that the battery is being charged The battery will be fast charged and after about 180 minutes the LED will go off To remove the battery cartridge open the battery door and tip the battery out of the printer Note To ensure a full charge do not operate the printer while charging Note The wall mounted charger is a Class I equipment E Multiple plug configurations comply with most international standards S3750THS Input Voltage Current 100 240 VAC 0 5A 47 63 Hz Output Voltage Current 10VDC 1A ES Note The wall mounted charger is not supplied with plugs for use in Korea Do not use a charger not approved by Extech for use with the N S3750THS Use of an unapproved charger could damage the battery oack or the printer and will void the warranty Page 6 The battery terminals are well recessed inside the printer Do not allow them to contact conductive materia
9. e LED should go off fthe amber LED is on this will continue on through this test indicating that the battery is accepting a charge and that the charge circuit is ok At the end of a 180 minute charge cycle the LED will go off 4 4 Battery and Safety I nformation The printer is powered by a 7 4V Li lon battery cartridge Charging time in the printer is approximately 3 0 hours Take the battery out of printer if storing the printer for long periods of time The battery storage temperature is 40 F to 104 F 4 C to 40 C Do not store a fully charged battery at temperatures greater than 104 F 40 C for long periods of time the battery may permanently lose charge capacity Be sure to use a fully charged battery before long or battery intensive printing sessions Certain operations for example printing receipts with a lot of bar codes and graphics drain the battery more quickly than others Dispose according to your local regulations Do not throw in trash Caution Do not disassemble short circuit heat above 80 C or incinerate The battery may explode The recommended temperature for charging is between 68 F 20 C to 77 F 25 C Page 19 4 5 Recycling your Batteries The Rechargeable Battery Recycling Corporation RBRC is a non profit organization created to promote recycling of rechargeable batteries For more information about how to recycle batteries in your area visit www rbrc org 4 6 Trouble Shooti
10. e receiver is connected Consult the dealer or an experienced radio TV technician for help For Bluetooth equipped printers please note amp The printer contains an OEM Serial Port Adapter from connectBlue with FCC ID PVHO70101 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 5 3 2 Warranty This printer is warranted by Extech Data Systems to be free of defects in parts and workmanship for a period of one year from date of shipment This warranty does not apply to defects resulting from action of the user such as misuse improper wiring operation outside of specification improper maintenance or repair or unauthorized modification Extech specifically disclaims any implied warranties of merchantability or fitness for a specific purpose and will not be liable for any direct indirect special incidental or consequential damages Extech s total liability is limited to the repair or replacement of the product The warranty set forth above is inclusive and no other warranty whether written or oral is expressed or implied Page 23 5 3 3 Warranty and or Repair Service A Return Authorization number must be issued before a unit is returned to Extech for repair Once a unit has been properly returned to Extech
11. elected the communication Parameters Baud rate Data Bit and Parity must be set These parameters apply both for UART 1 and UART 2 Note Optional serial cable is available for Serial RS232 communication part 5892RJ D9 Printer drivers for Windows 95 98 NT 2000 and XP are available from Extech PrinterCE print Control utility is available from Extech for Windows CE devices Printboy Print Utility from Bachmann Software or PalmPrint Utility from StevensCreek are recommended for Palm Pilot devices Figure 2 Dip Switch Location Page 11 3 2 2 Setting Dip Switches DERRRRRER EXAMPLE dip swuitch 1 sharun in OWN position 4 Note Be careful when changing dip switch settings Carefully use a pointer on the dip switch you are going to change DO NOT use a screw driver or apply excessive force 3 2 3 Dip Switch Functions Note Developer s refer to Programming Manual for more information Function Switch Switch Switch amp Notes Communication Interface SW1 SW2 SW3 RS23 Off Off Off Firmware version 0 5 som Y Off On On BT o On On y O RS SS O O RS 4 amp 5 BaudRate SW4 SW5 3840 Off Off J o 1920 Of O 0 960 On Parity Bit Parity Enabled Parity Disabled Odd Even Odd parity checker Do Even parity checker RS RS T T y O Auto Power Save Sws Unavailable on O e O e 7E Powe
12. ff To start the self test press and hold the FEED switch then press the lt On Off gt switch The printer starts to print the self test message Release the FEED switch Press the lt On Off gt or FEED switch to cancel the self test print The first few lines of self test show the printer firmware version the current printer settings for example IrDA or Serial mode and a list of any optional or special features installed SER BUFFER EXTECH Edi 5ET Wack CO Edd r B Lg lis t Lad EHES AIIE EM ELUZTEITH S87 1E SERIA MES ATJE CH RS5232D 36 49 E n DEHD PICH Resident Faris ane l upe derz TH AHI e HLLHE ELI IER FUNI 54 CIL JAWS COURIER FORT 5 CLIMA COURIER FONT 4B COLUNA COURIER FOHT 36 COL DO o Au zxigrh TEMA UE AAT AN N N EXTECH 3750 Figure 5 Sample Self Test Page 10 3 2 Connecting the Printer The S3750THS printer supports Serial RS232 and IrDA compatible infrared communication interfaces Radio frequency RF communication is also available as an optional feature as well as 802 11b interface Serial IrDA 802 11b and Bluetooth communication settings can be changed via a DIP switch located on the control card The DIP switch is located inside the battery compartment as illustrated below indicating the location of this switch Figure 2 shows the DIP switch selection The functions assigned to these switches are shown in Table 2 If the Serial interface is s
13. k sensor to remove any build up Moisten another cotton swab and rub the swab across the tear bar to remove any build up Note You may experience dust build up depending on the environment and the quality of the paper supply you use If this occurs use a can of compressed air to blow dust and paper debris out of the printer 4 2 Charging the Printer Battery The printer battery is charged using the wall mounted charger provided Follow these steps to charge the battery pack Plug the charger into an appropriate wall socket then plug the charger line cord into the adapter jack on the side of the printer see Figure 3 The yellow CHARGE LED will illuminate to indicate battery is charging The Charge LED turns off when battery cartridge is fully charged It takes about 180 minutes to fast charge the battery cartridge To insure full charge printer should not be operated while the battery is charging 4 2 1 Important Notes on Charging Batteries The model S3750THS printers require an adaptor output of 10VDC 1 4A The battery Fast charge is initiated each time the power adapter is connected to the printer The fast charge controller checks the battery s voltage and temperature before the start of the fast recharge process If the battery voltage or the temperature is outside of the fast charge limits the charger defaults to trickle charge at C 10 or 70 mA rate Optional external battery chargers are available for Extech bat
14. l since this may create a short circuit which could cause injury or start a fire When using the wall mounted charger ensure the socket outlet is close to the printer and easily accessible during the battery recharging process Either switch the socket off if supplied with a socket switch or pull out the charger from the socket or disconnect the plug from the orinter in the event of any problems 1 3 Reading the LED Status This table explains the LED indicator status Refer to Figure 1 for the locations described for ON OFF and FEED pushbutton switches and AC adaptor socket LED Indicator State amp Status LED 1 If the LED s Color is YELLOW it ON YELLOW indicates Low Power If the LED s Color is Green it indicates that Power is ON and that ON nee the printer is in RS232 or IrDA mode If the LED s Color is Blue it indicates that Power is ON and that ON ee the printer is in Bluetooth or 802 11b mode LED 2 ON YELLOW The battery charger is charging the battery at a fast rate If the battery IS below 5V the battery is being trickle charged until the battery voltage reaches 5V and then the fast charge rate Is started The LED will turn off when the battery is fully charged LED 3 ON GREEN Indicates that MCR is ready to accept data Indicates that SCR is ready to accept data ON RED Indicates a fault condition or a printer error The printer is not ready to accept data Printe
15. mation This section lists the printer control commands strings System Developers Please refer to S3750THS programmer s manual for further details Other features may be available and are described in the programmer s manual 3 7 1 ASCII CONTROL CHARACTERS NORM 14 20 Return to default 42 column mode Page 15 3 7 2 Printer Font Commands Courier Character Set Font Name Character size W x H Command String 16 CPI normal 12x23 ESC H k 2 12 CPI normal 16x23 ESC H k 1 13 CPI rotated 14x16 ESC k 0 3 7 3 Printer Font Commands ESC Fed 3 7 4 Printer Graphic Commands Select dot line spacing between printed lines ESC vnl h2 3 7 5 Magnetic Card Reader Control Commands Command String Printer Action ESC M nnm Cr Select MCR with nn auto timeout ESC C Cancel MCR read process 3 7 5 1 Smart Card Reader Control Commands when SCR is installed Command Strinc Printer Action ESC M nn 7 Cr Select SCR in direct mode with Serial RS232 UARTO nn is the auto timeout of the SCR ESC M nn 8 Cr Select SCR in PassThru mode with BT 802 11 or IrDA on UART1 nn is the auto timeout of the SCR Page 16 3 7 6 Graphic Logo and Bar code commands Command Strinc Printer Action ESC L G n Prepare printer to load image ESC G OxOFF Loading Logo Complete ESC L g n Print stored logo image
16. ng Problem Action Does not feed paper or has Remove any jammed supply a paper jam Reload paper supply Does not print Check or replace the printer s battery Make sure the paper supply is loaded correctly not backwards Verify communication between the host device and the printer by disconnecting the communication cable and performing orinter self test Light printing 4 Check or recharge the battery Adjust the print contrast through print application 4 Clean the print head following the cleaning instruction listed in Cleaning section Red Error LED on Check that paper roll is not out 4 Error reading MCR 4 After extended printing print head may be hot printer will pause before resuming printing If the problem is not identified following above trouble shooting guide contact Extech Technical Support Support numbers and Email addresses are listed at www Extech com AN Other than routine cleaning and other maintenance described in Section 4 the printer is not intended to be serviced by the user It must be returned to an authorized service center Under no circumstances should the user attempt to take the printer apart Page 20 4 7 Printer Supplies Part Number Description 757061 S3750T Thermal paper pack 3 80 mm 5 rolls 7842811 3750T PKG 120v US Plug 7842812 3750T PKG 220v EURO Plug 7842814 3750T PKG 120v UK Plug 7842811R 3750T MCR PKG 240v UK Plug
17. om the bottom as shown in Figure 3 Position the paper supply between the print head guides Make sure some supply 2 3 inches extends beyond the top of the paper supply well Close the paper supply cover and press close Page 8 Paper Door Lever Oniot Feed Adaptor Jack Figure 3 Operator Controls and Paper Loading 2 2 Tearing Paper The printer s paper door acts as a tear bar Pull one edge of the paper against the tear bar as indicated then tear down and across against the tear bar to tear the paper 4 Caution The tear bar may have sharp edges Using the tear bar is the only way to tear the paper Pulling up and pulling sideways without using the tear bar can cause a paper jam due to paper misalignment in the print head mechanism Figure 3A Tearing Paper Page 9 3 Using the Printer 3 1 Initial power up and self test Once the Battery is charged and the paper is loaded perform a self test Press the lt On Off gt switch once This turns printer on LED 1 illuminates in green or blue depending on the mode of communication After approximately 20 seconds if no instructions are sent to the printer the printer automatically turns off to conserve battery life Ifthe printer is set for infrared communications IrDA mode the printer will stay on all the time Pressing the lt On Off gt switch again will turn the printer off Press the lt On Off gt switch to turn the printer off The LED turns o
18. r is out of paper Note Refer to the troubleshooting guide to determine error or fault condition Table 1 Reading the LED Status Page 7 1 4 Attaching Belt Loop System The belt loop system consists of two parts Aknob located on the back part of the printer just above the battery door Astrap with click on connector To attach the strap to the knob insert the knob located at the bottom of the printer into the slot of the connector Pull down until you hear a click The printer is now secure The loop is then placed over your belt Allow the printer to hang down to either the left or right hip Torelease the printer press in on the two latches on the connector and pull the knob clear of the slot Note Do not force or pull the printer from the connector without pressing in on the two latches 2 Loading Supplies 2 1 Adding Paper Labels The printer can print text bar codes and graphics on thermal receipt paper See Supply Specifications for the width thickness requirements and approved vendors Follow these steps to load printer paper Open the paper supply cover by placing your fingers under the T pull lever and pulling up firmly on the supply cover until the lever stops moving DO NOT pull too hard Use enough force to allow the cover to unlock and lift freely DO NOT force the T pull lever too far back Place the paper supply roll into the paper supply well Make sure the paper supply unwinds fr
19. r save disabled On o Table 2 DIP Switch Setting Please note n order for changes to the dip switch configuration to take effect the printer power must be reset Page 12 3 3 Communications The S3750THS Printer has two UARTs and that is why it is able to support two modes of communication simultaneously Either RS232 and IrDA If Dip switch 1 is ON or RS232 and 802 11b BT If Dip switch 1 is OFF and Dip Switch 3 is ON Dip Switch 2 is used to control the RS232 Port If the Switch is turned ON the RS 232 port is disabled and if it is turned OFF the RS232 Port is enabled The reason why sometimes it is necessary to disable the Serial Port is that turning it off brings substantial power savings and hence a longer battery life There is an option between Bluetooth 802 11b The printer can have either one enabled but not both of them at the same time Serial The RS232C Interface signals for the S3750THS Series printers are terminated on a 6 PIN RJ type data connector located on the side of the printer Six connections are provided from the Serial Interface to the host computer The TABLE 3 below lists the Serial Interface signals and pin outs on the RJ connector and the connector pin locations are shown in FIGURE 6 A minimum of two connections are required for operation RXD pin 3 and Common pin 1 The communication Parameters Baud rate Data Bit and Parity must be set same as the host device settings
20. recognized safety symbols as follows Caution Refer to the explanation in this Manual Caution Risk of electric shock Double Insulation or Reinforced insulation DC Direct Current or Voltage AC DC Current or Voltage Page 4 l Getting Started 1 1 Unpacking the Printer The S3750THS portable printer is a full featured portable receipt printer designed for varied job environments including field service field sales hospitality and restaurants ticketing and many others where point of service receipts are required The package contains printer battery cartridge AC input DC output wall mounted charger may be USA European or UK Style plug for charging the battery inside the printer belt loop system and roll of paper supply already loaded in the printer Both cabled and wireless communication is possible 1 2 Installing and Charging the Battery Cartridge Note One battery cartridge is included with the printer Similar to a cordless phone battery the printer s battery must be charged before using it Extech batteries must be cycled several times to achieve maximum capacity To cycle a battery fully charge it and then allow full discharge through normal use in the printer 1 2 1 I nstalling the battery Note Refer to Figure 1 below to install the battery pack in the printer Unlock the battery door by sliding the battery door locking tab down Open the battery door Insert the
21. teries Page 18 4 2 2 Important Notes on Replacing Batteries Check for the correct Extech part number for the battery and only order that part for your new battery 4 A Caution Risk of explosion if battery is replaced by an incorrect type Z Caution Dispose of used batteries according to instructions in Section 4 5 4 3 Verifying Battery Charge State It is strongly recommended testing your printer before returning to Extech Follow these steps to identify and correct any battery power problem that may be encountered These will help to identify that the fault is with the printer and not some other part of your system To test the AC adaptor use a multi meter and measure the output Output should be 10VDC Press the lt ON OFF gt switch and wait until all LED s are off Insert the AC adaptor plug into the printer If the amber LED goes on the battery is not fully charged but the charge circuit is functioning The AC power portion of the circuit appears ok Disconnect the AC Adapter once the battery has charged for 5 minutes or so Press and hold the FEED switch then press and release the lt ON OFF gt switch and then release the FEED switch The printer will print a self test receipt 4 Ifthe self test receipt is printed the DC power is ok Press lt ON OFF gt switch and wait until all LED s are off Plug the AC adaptor into the printer Press ON the green LED is illuminated and after about 20 seconds th
22. y Length 3 125 inches 80mm 1 roll of receipt paper is approx 600 inches 15 240 mm Black mark on face of supply Paper roll diameter Maximum Print Area Approved Vendors Outside 1 375 inches 32 mm Inside 25 inches 6 mm 2 85 inches 72 mm X 8 0 inches 203mm Kansaki P300 P310 P350 P354 P390 P530UV TO281CA OP200 TO381N F180 F380 F550 Jujo TF 5OKS E2C Honshu FH65BV 3 Page 22 5 3 Regulatory Notes 5 3 1 FCC Part 15 Class B This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC rules These limits are designed to provide reasonable protection against harmful interference in a residential installation This equipment generates uses and can radiate radio frequency energy and if not installed and used in accordance with the instructions may cause harmful interference to radio communications However there is no guarantee that interference will not occur in a particular installation If this equipment does cause harmful interference to radio or television reception which can be determined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and the receiver Connect the equipment into an outlet on a circuit different from that to which th
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