Aquacom® STX-101 User Guide
Contents
1. STX 101 STX 101M lt STX 1LOISBE PORTABLE SURFACE TRANSCEIVERS a e DIVER THROUGH WATER SPEAKER COMMUNICATION RECORD BATTERY CHARGING MICROPHONE HEADSET 4 RELIEF VALVE 2 TECHNOLOGY IN DEPTH NOTICE This manual and the information contained herein are provided for use as a main tenance and operation guide No license or rights to manufacture produce and or sell either the manual or articles described herein are given Undersea Systems International Inc dba Ocean Technology Systems hereinafter referred to as OTS reserves the right to change specifications without notice We recommend that all users read and fully understand this manual before using the STX 101 M SB or any other underwater product All statements technical information and recommendations herein are based on tests we believe to be reliable but the accuracy or completeness thereof is not guar anteed and the following is made in lieu of all warranties expressed or implied including the implied warranties of merchantability and fitness for purpose Seller s and Manufacturer s only obligation shall be to replace such quantity of the product proved to be defective Before using the user shall determine the suitability of the product for intended use and the user assumes all risk and liability whatsoever in connection therewith Neither Seller nor Manufacture2. 6 2 2 Battery Installations ssnin 6 2 3 Low Battery 8 2 4 6 6 Volt Rechargeable 8 2 5 Battery Charing 8 2 6 Alternate Power Source 9 Section 3 Operation 10 Section 4 Maintenance 12 Section 5 Helpful Hints and Tips 13 Sel Transducer 13 5 2 Hand Held Microphone Headset ccecccesesseeeeceteeeeeeeeeeeeeeeeees 13 5 3 Placement of the STX 101 M SB 13 5 4 Talking and Listening 13 5 5 14 Section 6 Troubleshooting 15 Limited Warranty rendin 17 Illustrations Figure Panel Way Out 5 Figure 2 Battery System s c 0 chicas wi ae dee 6 Figure 3 Connection of Battery Wire 7 Tables Table 1 A Comparison of the STX Portable Surface Transceivers 2 Table 2 Low Battery Alert Voltage 5 8 SECTION
3. Defective transducer Defective transceiver on off switch Defective volume or squelch control Check and repair Clean pins and reconnect Replace transducer Replace switch Replace control Transmitter inoperative Transceiver board defective No audio from microphone Microphone signal path disrupted on board Board connectors not making contact Bad trace on board PTT logic circuits defective 15 Replace Replace microphone Trace open connection Repair or replace board Clean pins or replace defective connector Repair trace replace board or send unit to OTS for repair Repair trace replace board or send unit to OTS for repair PROBLEM PROBABLE CAUSE Weak battery Microphone pre amp circuit defective Defective CPU chip REMEDY Charge if rechargeable or replace Replace board or send unit to OTS for repair Replace board or send unit to OTS for repair No record out function Board connector not making contact Defective record amp Clean pins or replace defective connector Replace board or send unit to OTS for repair Power OK but cannot transmit or receive Defective CPU Defective channel switch Defective channel switch circuit board Transducer or cable defective Defective PLL synthesizer Defective components in modulator signal path Replace board or send unit to OTS for repair Replace switch Replace board or send unit t
4. SQUELCH Or CHANNEL eo oe le A STX 101 amp STX 101M B STX 101SB gt SURFACE THROUGH WATER _ RECORD COMMUNICATOR TT BATTERY CHARGING 12 VOLTS MICROPHONE HEADSET REWEF VOLUME XDUCER P 4 F Manufdpturef by OCEAN TECHNolpGY SYSTEMS i STX 101SB Figure 1 Panel Layout 2 BATTERIES AND INSTALLATION The STX 101 M 1 powered by two 6 volt heavy duty alkaline spring type batteries MN908 Duracell or two RB 6V rechargeable 6 volt batteries With the STX 101SB use only lead acid rechargeable batteries not alkaline 2 1 BATTERY SELECTION With the STX 101 M for best results use two 6 volt heavy duty alkaline spring type lantern batteries Eveready Heavy Duty Alkaline 528 or Duracell Heavy Duty Alkaline 109150 will provide the best results for most diving operations You can use standard 6 volt spring type lantern batteries in a pinch however battery life will be greatly reduced IMPORTANT NOTE You must use 6 volt lantern bat teries with spring contacts The threaded type of lantern batteries will not work The RB 6V rechargeable batteries should be used with the STX 101SB do not use alkaline batteries 2 2 BATTERY INSTALLATION 1 Locate and remove the ten screws found on the front
5. It is extremely important to remember to pull the transducer up when moving a vessel Many transducers have been lost when cut off by a propeller 5 2 HAND HELD MICROPHONE OR HEADSET Most hand held microphones or headsets are not waterproof Keep them as dry as possible 5 3 PLACEMENT OF THE STX 101 M SB The STX 101 M SB should be placed where it can be heard easily If working out of a boat locate a place where you can secure the unit where boat action will not cause it to fall Also remember to dress the transducer cable in such a way that divers and topside personnel will not trip over it 5 4 TALKING AND LISTENING When talking to divers keep in mind they have a lot of things going on while underwater It is best to get the diver s attention before giving him a message Example Mark Mark this is Topside come Mark Mark answers and then listens for your message Example Topside this is Mark go ahead Also remember to talk slowly and in one continuous sentence Try not to make long sentences It is always a good idea to have the divers repeat the message back to ensure they understood what you said Listening to divers is usually easier than divers listening to the topside tender Again repeat what you heard the divers say to ensure everyone is communicating accurately Talking and listening relating to diving is something that takes practice and will improve every time a team works together The U S Nav
6. Then plug the cable into your power source The charging time for a depleted battery is 4 6 hours Anytime you are charging the batteries the front panel Battery Charging Relief Valve Fig 1 7 should be opened Leave it open and do not operate the STX 101 M SB for approximately 15 minutes after charging This procedure will give the system time to dissipate any off gassing from the batteries After the process is complete close the Bat tery Charging Relief Valve 2 6 ALTERNATE POWER SOURCE The external receptacle Fig 1 4 provides an easy terminal for a marine or auto motive 12 volt DC source This terminal can also be used with any external power source providing 12 volts and a minimum of 4 amps capacity This receptacle is also used for charging the internal rechargeable batteries IMPORTANT SAFETY NOTES Before charging the batteries verify that they are RB 6V rechargeable batteries the vent is open and the internal plug is connected to the proper connector Fig 1 7 and Fig 3 22 Do not charge alkaline or heavy duty batteries Damage to the STX 101 M SB an explosion and or injury may occur Always wait a minimum of 15 minutes for any gasses expelled from the charged batteries to dissipate before powering up the STX 101 M SB SECTION 3 OPERATION The STX 101 M SB was designed to be portable and easy to operate After you have properly installed either 6 volt lantern alkaline or the
7. optional RB 6V batter ies you are ready to set up your surface station for use The STX 101 M SB is an ultrasonic through water communication system It must be operated using water as the transmission medium You will be able to talk to all other divers and surface stations on the same frequency and within range When you speak your voice is sent out in an omni directional pattern via the transducer to all other transceivers within range The transducer is the antenna that both sends out and receives signals The following are the recommended operating procedures 1 Ensure all batteries are properly installed and fresh and the front panel is installed without any pinched wires Place the STX 101 M SB on a surface that is secure from boat action and in a place where the transducer cable will not trip anyone Open the cover of the STX 101 M SB and connect the transducer cable to the front panel Fig 1 8 Connecting the transducer cable powers up the STX 101 M SB When not using the STX 101 M SB disconnect the transducer cable to conserve battery power Lower the transducer into the water If using a boat lower the transducer so it clears the hull If the base station is set up on a beach the transducer should be suspended from a float Under no circumstances should the transducer lie on the bottom If the transducer lies on the bottom it will cause most of the transmitting and receiving signals to be greatly reduced The resu
8. panel Fig 1 12 You do not have to remove the front panel screws located around the front panel speaker grill Fig 1 13 2 Carefully remove the front panel Be careful not to stress the connecting wire Key 14 Wing nuts securing battery bracket 47 15 Battery printed circuit board PCB 16 Battery retaining bracket 17 Battery plate 18 RB 6 batteries two 19 Wire harness connector 20 20 Hardware securing feet and battery plate Figure 2 Battery System 6 09 harness while setting aside the front panel Remove and set aside the wing nuts Fig 2 14 Remove and set aside the battery retaining bracket Fig 2 16 Insert two lantern batteries battery springs facing toward the battery printed circuit board Fig 2 15 Ensure they are firmly seated in the bottom of the battery bracket housing Replace the battery retaining bracket and tighten the wing nuts securely Ensure the wire harness is plugged into the correct connector on the printed circuit board Fig 3 When alkaline batteries are used the harness Fig 3 19 must be plugged into receptacle J8 Fig 3 21 When rechargeable batteries are used the harness must be plugged into J9 Fig 3 22 If this procedure is not followed properly damage may occur If you are trying to charge batteries with the harness plugged into the wrong socket the charger s current will not be channeled to the batteries It is also important y
9. source is capable of 12 volts DC at a minimum of 4 amps Upon completion of the above steps the STX 101 M SB will be ready for use The unit will already be in the receive mode and listening for incoming signals To talk to a diver and or another surface station hold the hand held microphone within 1 4 inch of your lips depress the push to talk PTT switch located on the side of the hand held microphone and speak slowly When you release the PTT button the STX 101 M SB will automatically go into the receive mode You must remember that all divers are hearing many sounds underwater e g bubbles or biological or man made noises Try to get the attention of the diver you want to talk to and then give him the message slowly An example of this would be Alpha Diver Alpha Diver this is Topside come in Alpha Diver Alpha Diver hearing his name will get ready for the message and reply This is Alpha Diver go ahead Topside We have found that talking to divers in short sentences works better than in long sentences This gives the diver a chance to take a breath and still receive a clear message 11 SECTION 4 MAINTENANCE Although the Aquacom STX 101 M SB has a rugged design it should be treated like any quality electronic instrument Avoid transportation modes that would expose the unit to constant vibrations and knocking about Ship the unit well packaged After use wipe the unit free of dirt debris and water U
10. 1 INTRODUCTION Congratulations You have just purchased the finest state of the art underwater communication system available The Aquacom STX 101 STX 101M and STX 101SB are compact ultrasonic single sideband transceivers designed to al low surface to diver and or diver to surface through water communications The STX series employs digital signal processing techniques which ensure the highest performance possible The STX 101 M SB offers many useful features to ensure user friendly perfor mance such as front panel squelch control a heavy duty panel speaker a record out connector female RCA a multichannel selector STX 101 and STX 101M only a heavy duty waterproof housing external power accommodations for 12 volts a headset optional with boom microphone output easy battery access and much more In all the STX 101 M SB Portable Surface Station is second to none 1 1 FEATURES The Aquacom STX 101 STX 101M and STX 101SB are packaged in the same housing although the STX 101SB s panel controls differ somewhat from those of the other two and are similar transceivers The major differences among the three products are as follows also see Table 1 The STX 101 is equipped with four channels including Channel 32 768 kHz upper sideband which is commonly used by sport divers Most of the Buddy Phone systems utilize Channel 1 If an STX 101 user makes a selection other than Channel 1 2 3 or 4 the transceiver will
11. cable to conserve energy CHANNEL The STX 101M has eight channels the STX 101 has four chan nels and the STX 101SB has one channel Section 1 2 Specifications If using the STX 101 and you choose an unprogrammed channel a beeping sound will alert you to select a working channel The STX 101SB s channel select switch is labeled with channels A and B but both settings access the same channel SQUELCH The squelch control is designed to help suppress background noise created by sea creatures and or man made sound e g snapping shrimp croakers or motor boat or pool pump noise When the squelch is rotated completely counterclockwise the squelch is deactivated and all noises within range will be heard You will also obtain the maximum reception range When you rotate the squelch clockwise you begin to eliminate background noise However you also decrease your range VOLUME The volume control adjusts the listening volume from the front panel speaker Clockwise increases volume and counterclockwise decreases It SCREW One of ten 10 Phillips head 8 32 stainless steel screws They all must be removed to gain access to the battery compartment and mother board Be careful not to lose the screws SPEAKER Heavy duty front panel speaker 4 DIVER THROUGH WATER SPEAKER COMMUNICATION RECORD BATTERY CHARGING MICROPHONE S7 REEF D w T
12. com Web www otscomm com You can now register your product online at the OTS Web site Just visit http www otscomm com register1 html
13. emit a beeping sound to alert the user that the selected channel is not available The unit is rated at 5 watts and comes standard with a 32 768 kHz transducer assembly and a hand held microphone Optional rechargeable batteries and a charger are available although alkaline batteries can be used The STX 101 is designed to operate primarily with the SSB 2010 commercial transceiver but also works great with our standard Buddy Phone transceivers such as the XT 100 MKIH BUD MTS BUD SCU BUD RX 100 etc the SSB 2001B 2 the SP 100 and the Magnacom MAG 1001S MAG 1003D MAG 1004HS and MAG 1003 PS as well as any other single sideband transceiver within range and on the same frequency The STX 101M is equipped with eight channels including the most commonly used military frequency 25 kHz upper sideband The first four channels are the same as those of the STX 101 Provided with the transceiver are rechargeable batteries and the RCS 13 smart charger although alkaline batteries can be used The STX 101M is rated at 10 watts and is equipped with a heavy duty 25 kHz transducer assembly The hand held microphone is high quality ensuring clear communications The STX 101M was designed to meet the demands of the military diver and functions 1 with our SSB 1001B U S Navy approved diver transceiver The STX will operate with most transceivers on the market as well as virtually all of the OTS wireless transceivers produced The STX 101SB is e
14. l 5 Channel 6 Channel 7 Channel 8 32 768 kHz USB Sport 32 768 kHz LSB 31 250 kHz USB 31 250 kHz LSB 28 5 kHz USB 28 5 kHz LSB 25 kHz USB Military 25 kHz LSB STX 101SB 25kHz USB or 8kHz USB Two 6 volt alkaline lantern batteries with springs MN908 Duracell or equivalent or two optional RB 6V gel cell batteries STX 101SB Use RB 6V rechargeable batteries only not alkaline STX 101 Alkaline 20 hrs gel cells 12 hrs STX 101M Alkaline 12 hrs gel cells 8 hrs STX 101SB Gel cells 6 hrs do not use alkaline 12 volts DC at a minimum of 4 amps Access via the front panel with the use of mini banana plugs Power Battery life with 10 duty cycle External power Transducer Piezoelectric type Squelch User adjustable from the front panel Volume User adjustable from the front panel Microphone Hand held dynamic 200 ohm impedance Record output jack Panel mounted female RCA connector line level Activation On Off On connection of transducer cable to STX 101 M SB Panel mounted banana jacks external speaker headset Heavy duty UK 603 case Stainless steel Greater than 100 dBv Greater than 100 dBv 300 Hz to 3500 Hz Height 6 500 in width 14 000 in depth 10 600 in 12 16 with batteries RCS 13 90 260 VAC input 12 VDC 1300 mA 60 Hz output Headset external speaker jack Housing Control panel Receiver sensitivity Automatic gain control AGC Transmitter s
15. lt will be poor range and weak no communications If a current is running and you must have a weight on the transducer to keep it from flagging tie the weight to a separate line and marry the transducer cable to the separate line Lower the line with the weight and transducer into the water and tie it off Adjust the volume to a comfortable listening level Adjust the squelch The squelch will help suppress background noise which is typically caused by marine biological e g snapping shrimp or man made propellers engines equipment etc noise It is important to know that the squelch adjustment will affect the range The more squelch you apply the less range you will achieve With the STX 101 and STX 101M select a channel that all other divers and 10 or surface stations will be using Channel 1 for the STX 101 and Channel 7 for the STX 101M are most efficient and recommended 8 Connect the hand held microphone to the microphone receptacle Fig 1 5 Ifa headset is desired connect the headset connector to the headset receptacles Fig 1 6 9 If you would like to record connect a male RCA plug into the Record Out receptacle of the STX 101 M SB Connect the other end of the record patch cable to the recorder s Record In Ensure the tape recorder is recording when the STX 101 M SB is operated Note This level is line level 10 Ifyouuse a 12 volt boat power or an alternate power source ensure the
16. o OTS for repair Replace Replace board or send unit to OTS for repair Replace board or send unit to OTS for repair Weak transmission Transducer ceramic cylinder fractured Microphone weak Replace Replace microphone Distorted unintelligible speech Transmitting or receiving on the Switch to correct channel wrong channel 16 LIMITED WARRANTY The Aquacom STX 101 M SB is warranted against defects in materials and or workmanship for a period of one year from the time of purchase Items not manufactured by OTS are covered by their manufacturer s warranty Our obligation under this warranty is limited to the replacement of any part or parts that prove to our satisfaction to have been defective and that have not been misused or carelessly handled The complete unit and or part must be re turned to our factory transportation charges prepaid We will ship all components back UPS Ground service in the U S A or if outside the U S the best way possible We reserve the right to decline re sponsibility where repairs have been made or attempted by other than OTS factory trained personnel or an approved OTS service center In no event shall OTS be liable for consequential damages Undersea Systems International Inc dba Ocean Technology Systems OTS 3133 West Harvard Street Santa Ana California 92704 Toll Free 800 550 1984 Tel 714 754 7848 Fax 714 966 1639 Email ots otscomm
17. ou do not try to charge alkaline batteries While the unit is open you may want to verify that the four screws securing the feet and the battery plate assembly are tightly secured Fig 2 20 Replace the front panel ensuring you have not pinched any wires Do not overtighten the ten front panel screws technical information tighten to 6 inch pounds IMPORTANT NOTE The silver pads located on the battery printed circuit board Fig 2 item 15 are configured to accept the spring contacts found on 6 volt spring type lantern battery at any axis at which the 6 volt lantern batteries are installed The spring contacts of the batteries must be in contact with the printed circuit board in order for the system to work Installing the batteries in the wrong direction spring contacts away from the printed circuit board may cause damage to the unit or batteries and or the STX 101 M SB will not operate 2 3 LOW BATTERY ALERT Key 19 Wire harness connector 21 J8 PCB connector for alkaline batteries 22 J9 PCB connector for rechargeable batteries 23 PCB connector for external power Figure 3 Connection of Battery Wire Harness 2 Low Battery Alert Voltage Levels Voltage V Tone Frequency 10 2 minutes 1 minute 30 seconds N A power switches off The STX 101 M SB is equipped with a unique low battery alert Table 2 indicates how often the alert tone sounds as the battery voltage drops When the bat
18. peech freq bandwidth Housing dimensions Weight Battery chargers 1 PEP peak envelope power 2 USB is upper sideband LSB is lower sideband 3 The actual battery life is variable so the time periods stated here are approximate 3 1 3 FUNCTIONS See Figure 1 throughout 1 2 10 12 13 HANDLE One of two front panel handles SPEAKER switch Toggle switch used to turn the front panel speaker on or off RECORD OUT This female RCA receptacle is used to connect to any type of recording system It supplies Line Level signal output 12 VOLTS POWER CHG Used when an external 12 volt DC power source is desired Ensure the source has a minimum of 4 amps This receptacle is also used to charge rechargeable batteries MICROPHONE This receptacle is used for a hand held microphone or headset with boom microphone HEADSET Can be used with an optional THB 101 headset You can also use this outlet for an external remote speaker using a dual banana plug BATTERY CHARGING RELIEF VALVE This relief valve must be open when charging rechargeable batteries We also recommend that the relief valve be opened when transporting the unit via aircraft to allow depressurization at increased altitude XDUCER ON OFF The unit will power up and cycle to the receive mode when the transducer cable is connected to the female receptacle 8 Ifyou are not using the system disconnect the transducer
19. quipped with one channel either 25kHz upper sideband standard or 8kHz upper sideband optional It is a high power 70 watt surface station designed to be used for communication with diving bells that use the BELL 200 bell back up system Rechargeable batteries and the RCS 13 smart charger are provided with the transceiver alkaline batteries should not be used with the STX 101SB The system includes a high quality hand held microphone Note This manual will refer to the STX 101 STX 101M and STX 101SB transceiv ers collectively as STX 101 M SB Wherever we present information that is not common to all we will refer to them by their individual model numbers Table 1 A Comparison of the STX Portable Surface Transceivers Transmit Power_ Batteries amp Transceiver Channels Rating Charging Application STX 101 4 5 2 6V alkaline spring Sport Commercial PEP type or RB 6V recharge able not provided STX 101M 10W 2 6V alkaline spring Military type or RB 6V recharge able with RCS 13 charger provided STX 101SB 2 RB 6V rechargeable Communication with RCS 13 charger with diving bells provided 1 2 SPECIFICATIONS Transmitter output power nominal STX 101 Audio output to speaker 4 watts Modulation Operating channels STX 101 STX 101M 5 watts PEP STX 101M 10 watts PEP STX 101SB 70 watts PEP Single sideband with no carrier Channel 1 Channel 2 Channel 3 Channel 4 Channe
20. r shall be liable either in tort or in contract for any loss or damage direct incidental or consequential arising from the use of or the inability to use the product No statement or recommenda tion not contained herein shall have any force or effect unless it is in an agreement signed by officers of the Seller and Manufacturer IMPORTANT SAFETY NOTICE Please read before using product It is absolutely essential that all divers are properly trained and equipped and fully understand this user s manual before attempting to use the STX 101 M SB or any other underwater product While the STX 101 M SB provides divers with good underwater communica tions it does not change or eliminate the potential hazards of diving Refer to the Library page of our Web site www otscomm com for a list of any changes made to this manual since its publication Copyright 1999 2012 by Undersea Systems International Inc dba Ocean Technology Systems All rights reserved Specifications are subject to change without prior notice 506063 000 Rev G TABLE OF CONTENTS Section 1 1 1 3 1 35 Ashes 4 Section 2 Batteries and Installation 6 2 1 Battery Selection
21. se a clean soft cloth Warm water with a small amount of non abrasive soap is the recommended clean ing solution The transducer should be kept clean and free of oils The transducer itself can be cleaned with denatured alcohol The transducer assembly should be stored in a separate container if wet after a dive Store the hand held microphone and optional headset in a dry area The microphones are not waterproof and are barely water resistant Keep them free of water or from water spray Mild soap solution wiped dry is the preferred cleaning method Inspect the batteries periodically to ensure they are in good order and free of leaks When the STX 101 M SB is not being used it is a good idea to keep the cover securely fastened Remember when the transducer assembly is connected to the STX 101 M SB the power is on To conserve energy when securing or cleaning disconnect the transducer connector from the front panel 5 HELPFUL HINTS AND TIPS The following helpful hints should help you understand how to use the STX 101 M SB 5 1 TRANSDUCER It is important that the transducer be protected It is designed with a material that can break if sharply hit or impacted It is also important you do not hang the transducer in a position that is blocked or lyingon the bottom divers should inform everyone if they go below a thermocline If possible lower the transducer to the same depth as the divers in the thermocline
22. tery volt age falls below 6 volts the microcomputer switches the system power off prevent ing damage of gel cell style batteries When using standard alkaline batteries you should have approximately one half hour more service from the first tone alert 2 4 RB 6V 6 VOLT RECHARGEABLE BATTERY When utilizing the optional RB 6V sealed lead acid battery you will attain the maximum performance of self contained batteries two are required The STX 101M and STX 101SB come standard with two RB 6V batteries Install the bat teries per the instructions found in Section 2 2 When using or charging the RB 6V batteries ensure the power harness in the battery compartment Fig 2 19 is connected to J9 Fig 3 22 on the circuit board This channels the charger s current to the batteries Note The battery you receive may have upgraded specifications from what is stated in this manual Due to advancing battery technologies we continually upgrade our batteries and chargers Contact OTS or your OTS dealer to find out the latest available battery and charger 2 5 BATTERY CHARGING Once the RB 6V rechargeable batteries are installed charging them is simple If in the U S you will need an RCS 13 smart charger If you intend to use the charger outside the U S cut off the plug and install the appropriate connector We recommend you first make the connection between the panel s 12 volt Power CHG port Fig 1 4 and the charger cable
23. y has found that wireless communications definitely have an associated learning curve It took about three days of diving per Navy diver to become proficient with the equipment Do not 13 be discouraged when first using wireless communications 5 5 IN THE BEGINNING If this is the first time you or anyone on your team is using communications we recommend the team get together to talk about the system Practice alternative communications in the event something is not working Plan to use a second chan nel everyone knows to use in the event someone gets off the working channel A pool session or a place where the team can practice in a controlled environment is recommended You will find it takes about three full dives before you will be talking and listening like the pros Have fun and we hope to see you on a com munication dive in the future 14 PROBLEM No power SECTION 6 TROUBLESHOOTING PROBABLE CAUSE Battery exhausted Battery leads loose Defective on off transducer connector Open circuit on board REMEDY Replace battery Check battery connection Change connector Replace board or send unit to OTS for repair Power only for a short time when transducer connector is connected Defective boot circuit Defective CPU chip Replace board or send unit to OTS for repair Replace board or send unit to OTS for repair No receive signal Loose leads from transducer connector Board connectors loose
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