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Lowrance electronic X-15A User's Manual
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1. try has been confirmed Note When an initial transmit pulse length is set this length will be fixed for all depth settings until changed To return control back to the micro computer press 0 PULSE and the micro computer will select the initial pulse length Example Set the initial transmit pulse length to 100 micro seconds Press 1 0 0 PULSE Result Wa mm 4a aaa bD P LID am p ae nee ne i Figure 39 Discrimination Noise pulses are the largest complaint most often received about sonar units Lowrance has had the patented Suppression system for many years which is quite effective at eliminating noise from the display See Transmit Pulse Width The only drawback to the Suppression system is that it increases the transmitter s pulse length which decreases resolution and causes targets that are close together to merge into one blob instead of two distinct images Discrimination is a program installed in the X 15A s micro processor that enables it to process the output from the re ceiver determine which signals are noise and eliminate them then print only the legitimate echoes Using this concept the transmit ted pulse does not have to be increased therefore records with high resolution and high noise im munity can be achieved The Suppressor Control may be used with the Discrimination to cancel OUT heavy interference or noise whenever high resolution is not
2. ON but the stylus and paper don t move What To Do Check fuse check connections at battery for tightness and corrosion Symptom On Off switch is ON have zero mark but no echoes or bottom signal What To Do Be sure the transducer is plugged e 6 GRAYLINE wt E 8 fom ore 7 Fi SENSITIVITY i suppi Figure 4 When high Sensitivity settings are used a second bottom echo will appear This is normal and is caused by the returning signal re flecting off the surface of the water making a second trip to the bottom and back If detailed information about brush piles individual fish or the oA SA RRAS re Be i _ ut SENSITIVITY PROPER SETTING thermocline is desired the Sen sitivity knob should be rotated to approximately the 34 point Refer to the illustration below to see Figure 6 t bags B 4 i be ane aa ab e B0 p 7 4 SENSITIVITY TOO LOW what effect the Sensitivity control setting has on the recorded information Recording individual fish with an arched signature can usually be accomplished at trolling speed with the Sensitivity knob at the point or higher Refer to the sec tion Arched Signatures for more information about this important function of your recorder Suppression Control The Suppression Control is used to reduce interference from noise Noise in electronic terms is any undesired signal It can be c
3. paper speed down until a solid record is achieved The paper speed may also be slowed when not looking for fish or to simply conserve paper For more informa tion about saving paper read the Alternate Transmit and Print func tion in the Advanced Operation section 500 790 GRAYLINE CONTROL The GRAYLINE function can be used to outline the bottom contour which might otherwise be hidden beneath trees and brush it can also give clues to the composition of the bottom A hard bottom re turns a very strong signal causing a wide gray line A soft muddy or weedy bottom returns a weaker signal which is emphasized with a narrow gray line Do not advance J the control too far or it will gray line on the target completely showing no black which makes the target difficult to see n A padi ee S ae fe eee eee Figure 12 GRAYLINE ON RANGE The range function utilizes the keyboard to select any range be tween 0 10 and 2540 2550 Please read this section carefully to get the most out of your X 15A s range capabilities Lower Limit When you first turn on the X 15A the range will be 0 60 feet See Figure13 To change to a deeper range simply press the desired depth on the keyboard and then press the LOWER LIMIT key i ee Bi Nee ty ae Sacked aed S eas eee ee leo pa U BOE ne he ee ee E N R Figure 13 Figure 15 Example Change range to 0 80 feet Pr
4. 25 130 510 520 830 Below 840 Figure 33 Figure 35 STYLUS BELT REPLACEMENT CAUTION High voltage Is pre sent in the electronic section when the unit is turned on 1 2 TURN THE UNIT OFF Release both catches on the top of the case Pull out and down on the top of the case front and the platen to expose the stylus belt The stylus belt rides over two wheels located at the right edge of the platen assembly Refer to Figure1 on page 2 Move the front of the belt DOWN to position the stylus at the center of the platen Grasp the belt at the stylus holder with the thumb and forefinger and move it gently Figure 34 Figure 36 a to the left while pushing the belt off the wheels with the other forefinger See Figure36 5 Position the new belt on the Figure 31 Figure 32 STYLUS REPLACEMENT CAUTION High voltage is pre sent in the electronic section when the unit is turned on 1 TURN THE UNIT OFF 2 Release both catches on the top of the case Pull out and down on the top of the case front to expose the stylus belt See Figure 25 3 The stylus belt rides over two wheels located at the right edge of the platen assembly Move the front of the belt DOWN to position the stylus at the center of the platen 4 Hoid the stylus belt stationary with one finger and remove the old stylus by starting at its left edge and moving it out from under the tabs
5. Usually this means trolling at very slow speeds with the main engine in gear at minimum throttle setting THERMOCLINES The temperature of water in the lake is seldom constant from top to bottom Layers of different tem peratures form and the junction of a warm and cool layer of water is called a thermocline The depth and thickness of the thermocline can vary with the season or time of day In deep lakes there may be two or more at different depths Thermoclines are import ant to the fisherman because they 11 are areas where fish are active Many times bait fish will be above the thermocline while larger game fish suspend just below it Your Lowrance X 15A can de tect this invisible layer in the water but the Sensitivity knob will probably have to be set at the 14 point or higher PAPER LOADING CAUTION High voltage is pre sent in the electronic section when the unit is turned on 1 TURN THE UNIT OFF 2 Release both catches on the top of the case Pull out and down on the top of the case front to expose the platen as sembly See Figure 23 3 Move the stylus belt DOWN to position the marking stylus on the back side of the pla ten NEVER move the belt up the stylus may be damaged See Figure 24 SPECIAL NOTE The stylus may be damaged if the platen assembly is pulled down un less the stylus has been moved to the back side of the platen
6. required There are four levels of Dis crimination that can be used The lowest value 1 is the weakest z9 SPECIFICATIONS X 15A Depth Ranges Feet fathoms meters Operating Frequency 192 kHz 192 000 cycles per second accuracy is within 0 6 percent Pulse Length duration of pulse 200 1000us 30 2000u4s programable Operating Voltage Minimum 10 volts DC Maximum 15 volts DC Operating Current 0 7 to 1 8 amps depending on printing density and output power Output Power 1600 watts typical peak to peak 200 watts RMS Weight 8 5 Ib 3 9 Kg Dimension With Gimbal Mount Width 12 Height 9 Depth 6 Instrument Only Width 10 Height 8 Depth 65 NOTICE Periodically wash the Trans ducer Face with soap and water to remove any oil film that may collect Oil and dirt on the face will reduce sensitivity or may even prevent sounding GOT A PROBLEM LET US HELP if you have a problem with your sonar unit please give us a chance to help before sending it in for repair Assistance can often be ex tended by telephone or letter Write or call one of our Authorized Service Centers or the Lowrance Electronics Inc Customer Ser vice Department in Tulsa OK Toll free 1 800 331 3889 Please detail the problem you are experiencing Our Service De partment may be able to save you the inconvenience of returning your unit If it is determined that your unit must be
7. the two tabs together on the paper retainer and returning the re tainer back to the operating position See Figure 31 Turn the small knob at the upper left hand side of the platen assembly to put a small amount of tension on the paper It should be snug against the platen Figure 32 Push the platen assembly back to its operating position Be sure it engages the catch inside the top of the case Close the front of the case Latch both catches on the top of the case Turn the unit on Move the Chart Speed knob fully clock wise Watch the paper Jong enough to be sure it is mov ing smoothly and evenly across the platen If the pa per flutters or begins to run uphill repeat step 8 13 Figure 27 Figure 29 Figure 26 12 a OAAYLINE 4 AS parasi tep z t wy SENSITIVITY Figure 24 4 Pull out and down on the tab at the top center of the platen assembly to expose the pa per spools See Figure 25 To remove the full take up roll and the empty supply spool press the two metal tabs to gether on the top of the platen assembly and pull out and down on the paper retainer See Figure 26 The full take up roll can now be easilly re moved from the paper core shafts See Figure 27 Pull the empty supply core from the right side in the same manner Instali the empty core onto the take up shaft See Figure 28 Align the t
8. Press MARK Result A ae i 4 ab 4B 4B bo I ae 7 aig aaa Figure 19 SCALE The numbers that indicate the depth or scale may be deleted if desired Pressing the SCALE key once will stop the printing of the scale numbers The scale may be displayed again by pressing the SCALE key Remember the scale may be displayed at any time by pressing either the UPPER LIMIT or the LOWER LIMIT key Example Press SCALE Result See Figure20 Sets T EEEN Figure 20 END OF PAPER MARKER The graph paper in the X 15A has a red line printed at the bot tom of the paper to signify when there is only 2 to 3 feet before the end of the paper ZERO ADJUST Occasionally when changing the stylus or stylus belt the zero line does not print at the same place near the top of the chart paper Figure 21 A zero adjust control has been placed on the back inside wall of the X 15A near the upper left hand corner so that the zero line s position may be adjusted on the paper Open the case front and look for the decal marked ZERO AD JUST You may have to pull the paper transport assembly down to see the decal for the first time Push the transport closed and turn on the unit Caution Keep hands away from the stylus belt and stylus High voltage is present Insert a 6 8 long screwdriver with a 1 blade into the zero ad j
9. To turn this feature on simply press the 2nd key then press the 4 key The paper speed will im mediately slow down signifying that the function is enabled To turn the Alternate Transmit and Print feature off simply press the 2nd key and then press the 7 key The paper speed will im mediately speed up signifying that the function has been turned off When entering any number or combination of keys on the key board and you make a mistake press the 2nd KEY then 0 This will clear the keyboard For exam ple if you wanted to set a Lower Limit of 50 feet and pressed 40 feet instead before pressing the Lower Limit Key press 2nd 0 and the keyboard will be cleared You could then press 5 0 Lower Limit for the desired range To cause the X 15A to reprint the level of Discrimination SCC or Pulse Width at the bottom of the page simply press 2nd and then the corresponding key DISC SCC MARK or PULSE and it will be reprinted immediately Paper Saving Feature APPROXIMATE PAPER SPEED Without Alternate Transmit and Print LOWER LIMIT RANGE feet 10 120 130 510 520 830 Below 840 Minimum Paper Speed Inches Hours Inches Hours Per Min Per Roll Per Min Per Roll Maximum Paper Speed 10 2 35 20 66 66 APPROXIMATE PAPER SPEED With Alternate Transmit and Print LITHO USA Minimum Maximum LOWER Paper Speed Paper Speed LIMIT In
10. YLUS DRIVE BELT the Suppressor control turned down to minimum when looking for fish However it is helpful sometimes to have longer pulse width when resolution is not a concern When using a sonar in deeper water it is easier for the unit to detect a long er pulse coming back from the bottom or from fish This is called Probability of Echo Detection The probability of the unit being able to detect an echo returning from deep water is diminished be cause the further the sound pulse has to travel the weaker it be comes By broadening the pulse length in essence a larger signal is transmitted and it is easier for the receiver to detect it For this reason the micro com puter in the X 15A automatically increases the initia pulse length of the unit as deeper lower limits are set by the operator Note Initial pulse length is the pulse length of the unit when the Suppressor con trol is turned to minimum INITIAL TRANSMIT LOWER PULSE LIMIT WIDTH feet micro seconds 10 110 20 130 30 160 40 200 200 From 210 feet to 600 feet the initial pulse length increases at the same rate as the depth For ex ample with the LOWER LIMIT set to 260 feet the initial transmit pulse length would be 260 us lf the LOWER LIMIT is set to 390 feet the initial transmit pulse would be 390 us Finally from 600 feet and below the initial pulse length remains at 600 micro seconds The transmit pulse length can be incr
11. all mark is made This is called the zero mark and represents the surface of the water The stylus continues Figure 1 ig ai a GRAPH PAPER PAPER TRAVEL 2 f ringt to move down the edge of the paper while the sound pulse is traveling through the water and when an echo is detected the sty lus makes another mark on the paper The depth of the object which reflected the echo can be read in feet by comparing its loca tion on the paper to the depth scale printed on the paper The paper speed is controlled by a variable speed motor During one revolution of the stylus belt a very narrow mark will be made by the flexible stylus but the paper will move a small amount before the next revolution Each mark will blend into the one before so that a composite picture of the target will be made one tiny mark at a time Due to the many features that this unit has this manual has the operation section split into two parts The first section is entitled Basic Operation and covers everything that is absolutely necessary to use the X 15A in a wide variety of situations It will tell you how to use the basic controls Sensitivity Suppression Paper Speed GRAYLINE Range plus a few special functions This section will be adequate for most situa tions However once you have mastered the basic operation of the X 15A you may wish to try some of the features described in PULLEY DRIVE ST
12. ate When using the X 15A in deep water or if you wish to simply con serve paper it may be desirable to slow the paper speed even more than the automatic system allows However when doing so you may get over print or very dark heavy printing over an area that is difficult to read Much detail can also be lost due to this A feature that is available on the X 15A is the Transmit and Print Alternate function which when activated causes the stylus to print every other revolution in stead of every revolution This accomplishes four things 1 Since the stylus only prints every other revolution the recorded information doesn t have the over print problem therefore good records are attainable at slower paper speeds Also the scale num bers are spread out more mak ing them more legible 2 Reduces the possibility of wrap around This is the un desirable occurrence of the second or third bottom echo printed on the paper at the top or middle of the page Many times this can interfere with fish or other targets that you wish to see 3 Reduces the reverberation ef fect This happens mainly on lower frequency units but it can happen on higher fre quency models Reverberation is heavy scattered noise marks caused by the transmitted sig nal becoming trapped between the surface and the bottom usually scattered in heavy plankton layers or baitfish schools This causes a great many lines to be pri
13. aused by an electrical source such as the engine s ignition sys tem or by air bubbles in disturbed water which is call cavitation In both cases the noise could pro duce unwanted marks on the paper See Figures 7 amp 8 Fortunately noise pulses are rela tively short in time compared to real sonar signals Advancing the Suppression knob will cause the system to reject these unwanted short pulses without reducing the D ratic unwanted noise marks Most of the time at low or trolling speeds no suppression will be neroa Figure 7 oe 2g 42 L we 1d Figure 8 sensitivity in any way This patented design is exclu sive with Lowrance However with high suppression settings the graph record becomes coarse and the ability to separate fish from the bottom or from other fish will be decreased See Figure 9 amp 10 Therefore the lower the suppression setting the better depths turn the paper speed con Advance the knob setting only as trol up to at least the position far as necessary to remove the er when trolling This will show prop APPROXIMATE PAPER SPEED Without Alternate Transmit and Print Figure 10 PROPER SETTING Paper Speed Control This knob adjusts to speed of the chart paper For good detailed graphs in shallow to medium Minimum Maxton LOWER Paper Speed Parens iho LIMIT Inches Hours Inches Hours RANGE feet Ter m re Per Min Per Roll 10 120 2 35 4
14. ches Hours Inches Hours RANGE feet Per Min Per Roll Per Min Per Roll 10 120 20 1 4 130 510 50 0 8 520 830 66 0 75 Below 840 66 0 75 r 988 0096 01 INSTALLATION AND OPERATION MANUAL X 15A COMPUTER SONAR GEA TLR PAPER GRECO oe ry a ey Oef 8 SENSITIVITY M suppREsace oe OPE LOWRANCE tate 7 i kal Ei EZ KZ EJ ES E LOWRANCE ELECTRONICS INC 12000 E SKELLY DR TULSA OK 74128 INDEX Specifications 6 cece eee teeta eee ee 1 Service Information 0 0 2 cee eee eet eee 1 Introduction e a a e aiea aie E Daia aE E 2 How It Works 0 00 20 c cc cece ee eet ene eee eee eda a anon ones 2 Installation ccc cece ccc cee eee emcee eee b en nenene 3 Transducer Selection 2 6 e cece eee eee teens 4 Basic Operation 0 0 0c ce cece tee eee eee een etees 4 SUPPFOSSOM a se cece eet een ee eee ene eres enennnenneesaes 5 Paper Speed 55 ie teble Audigy alae E BCE E 6 GRAYLINES ia nennen co cedure bie ee oa tesa Sabb nee 7 Range seid ei sede cade tena eee eae eee hes 7 Lower Limit 0 2 ccc ccc cc eect e ee eee ne eens 7 Upper Limit 2 2 0 0 e eee eee nent e tent eens 8 Dines a a a a avicd iis Sele eet iad Via eee 9 Markol oot diexccvag s AE a Aa kA aE E EE A os okie esa EEE NAA 9 Scali anre eiD ies a e OaE aa aa RE a iE eria 9 End Of Paper ccc c cece teen tence ener e eee rnnr renn 10 Zero Adjust sos ses cela pwn can
15. cific needs Gen erally wide cone angle transduc ers 20 degree are ideally suited for operating in shallow water or at medium depths The 20 degree cone angle allows you to see more of the underwater world In 15 feet of water the 20 degree cone angle allows you to see an area of the bottom that s approxi mately 6 feet across The 8 degree transducer covers only about a 2 foot circle Figure 3 Cone Angle Depth Diameter 50 100 150 200 Thus you would use a 20 de gree transducer when looking for fish or structure to easily find drop offs and to see fish that are around you not just below you However the 20 degree trans ducer won t penetrate to greater depths as well as the 8 degree transducer nor will it show a sharp drop off as well in a deep water environment 100 feet or deeper the narrow cone angie is more desirable because it can more accurately detect the loca tion of the fish or drop off in deeper water Since the sound energy is concentrated in a smaller area it can reach to deeper depths Both the 8 degree and the 20 degree Lowrance transducers give accurate bottom readings even though the bottom signal is much wider on the 20 degree model be cause you are seeing more of the bottom Remember the shallow edge of the signal shows you the true depth The rest of the signal tells you the composition of the bottom i e whether you are over a soft or hard bottom etc
16. d to blow dust out of the case and away from moving parts if the air is dry and free of oil All mechanical connections should be checked periodically to be sure they haven t worked loose HIGH VOLTAGE is present in the transmitter section when the unit is ON No attempt should be made by any unauthorized per son to modify or repair the elec tronic section All electrical connections should be checked periodically and cleaned as necessary The face of the transducer if mounted on the transom should be washed periodically with mild soapy water to remove any ac cumulated rod grime or oily film This is essential to have good contact between the transducer and the water DO SECTION Do carry a spare fuse styl s belt and roll of paper Do use the empty cardboard core from the last roll of paper on the take up post Do keep the recorded graphs for future reference Do clean the stylus belt wheels and the rubber roller after every five rolls of paper DON T SECTION DON T OPEN THE CASE WHEN THE UNIT IS ON Don t pull the platen assembly down when the stylus is at the front Don t store any objects inside the case or behind the viewing win dow Except for small pieces of tape Don t forget to tape the paper to the take up core Don t rotate the stylus belt up Don t use oily cloths strong sol vents or abrasive cleansers TROUBLESHOOTING SECTION Symptom On Off switch is
17. eased from the initial point at any time by rotating the Sup pressor conirol clockwise The maximum amount of pulse length added to the initial transmitter pulse length is approximately 800 micro seconds In other words if the LOWER LIMIT is set to 420 feet and the Suppressor control is rotated to the maximum position the transmitter pulse length would be 1220 micro seconds 420 initial 800 1220 Earlier we talked about the rela tionship between pulse length and target separation As pulse length increases target separation or resolution is degraded However if the pulse width is decreased res olution becomes much better The X 15A allows you to take advantage of this fact by making it possible to override the initial transmitter pulse length setting from what the micro computer selects according to the Lower Limit The initial transmitter pulse length can be set from 30 us to 2000 ys by entering it on the key board By setting the initial trans mitter pulse width to 100 ys a three inch resolution is obtained 50 ws is equivalent to an inch and a half and 30 ys initial transmit pulse length is equal to one inch resolution No other graph re corder in the market today can give you this feature After setting the initial transmitter pulse length the suppressor control can still be used to cancel out noise by in creasing the pulse length or the Discrimination function described below can be used to eliminate
18. ess 8 0 LOWER LIMIT The depth will then be displayed TARO eae a 5 poa bY by GU D ee A I G H Figure 14 E Any depth in a multiple of ten 10 20 30 500 etc may be used as a lower limit displayed at the bottom of the chart paper Example Change range to 0 150 feet Press 1 5 0 LOWER LIMIT The depth will then be displayed See Figure 15 Note that the paper speed slows automatically at this range setting UPPER LIMIT Many times it is desirable to ex 2 pand a section of the area that is displayed on the graph recorder to show more detail This is made possible by the X 15A to show segments of the underwater world by using the UPPER LIMIT func tion Using the UPPER LIMIT key allows you to display any depth range in multiples of 10 at the top of the chart paper Example Turn on unit and set range to 20 60 feet Press 2 0 UPPER LIMIT The depth will then be displayed a 2i 20 5 5 BB S cae Ae EE i4 m SE R F 5 3 Se apa omer aceon ee Figure 16 Example Set range to 40 60 feet Press 4 0 UPPER LIMIT The range will then be displayed See Figure 17 The Upper and Lower Limits can be used in various combina 10 11 12 squarely to the take up core See Figure 30 Small pieces of tape may be stored inside the housing for this purpose A Close the top of the platen assembly by pressing
19. he battery If a longer cable is required use ordinary 18 lamp cord available at any hardware or electrical sup ply store Splices should be sol dered however if this isn t done then use crimp type splices Tape all splices with electrical tape An in line fuse holder with fuse is supplied with the X 15A Be cer tain to install this as close to the power source such as the boat battery or power buss as pos sible This will protect both the sonar unit and the power cable in the event a short occurs Crimp connectors are supplied to attach the fuse holder to the power cable The red wire in the power cable is the positive conductor The black wire is the ground or negative conductor The graph is protected from ac cidental polarity reversals and no damage will occur if the wires are reversed The unit will not operate until the proper polarity is applied 12 Volts DC Negative Positive TRANSDUCER SELECTION Lowrance offers you the choice of transducers with either an 8 de gree or 20 degree cone angle that will interchange with any of our 192 kHz sonar units In other words any Lowrance sonar instru ment can be used with any Low rance transducer of the same frequency without retuning of any kind and no loss of performance However the use of any other manufacturer s transducer will re sult in a loss of performance Now you can select the trans ducer design and cone angle to best fit your spe
20. ill BASIC OPERATION On Off and Sensitivity Control Rotate the Sensitivity knob clockwise to turn the unit on The Sensitivity knob works much like the volume control on a radio that is weaker signals will be detected with higher settings of the knob When cruising or at other times when just simple bottom contour information is desired the Sen sitivity setting can be low In deep water or over soft muddy bot toms which produce weak echos the setting will have to be higher into the unit and the transducer is in contact with the water Symptom The unit is ON but paper does not move What To Do Tape paper to cardboard spool on take up post Symptom Recorder marks are faint or dim What To Do Clean viewing door replace the stylus check battery connections Symptom Recorded marks are very heavy paper is torn by stylus What To Do Bend the stylus slightly to reduce pressure on paper VI ADVANCED OPERATION Surface Clarity Control SCC The surface markings at the top of the chart paper can at times extend many feet below the sur face This often interferes with fish signals or other targets This is called Surface Clutter and is caused by algae and plankton air bubbles caused by wave action or boat wakes bait fish or tempera SAE TAC SEER oe ees Ze e ee Segoe age si ee Ben bl DB Figure 37 SCC 2 ture inversions The surface clutter markings can be reduced
21. ill describe several other features that will en able the serious operator to get the maximum benefit from this equipment We urge you to read this man ual thoroughly and familiarize yourself with the controls Al though this is a very advanced unit it is easy to use thanks to the power of the micro computer and the front panel controls Should you require extra help or just have a question please call our Customer Service Department toll free 1 800 331 3889 Okla homa residents call collect 1 918 437 6881 Or check the en closed list for a service center in your area A representative will be happy to help you li INSTALLATION Mounting The depth sounder may be in stalled in any convenient area provided the unit can be tilted for the best viewing angle Holes in the bracket base allow wood screw or bolt mounting A wood stiffener may be required on the back of thin fiberglass panels to support the unit lf the desired location is closer than 18 to a magnetic compass a trial run should be made with the unit in operation to be sure Figure 2 A Ground that the compass readings are not affected Power Connections Twelve volt DC power for the depth sounder should be supplied by the boat s 12 volt electrical sys tem The power cable may be at tached to an accessory or power buss but if you have problems with electrical interference the cable should be attached directly to t
22. na ane oes cae ee Ee Se ee 10 How To Read Graphs 0 6 cece eee ee teens 10 Paper Loading s ccc e teen ee eee tent en eee nnn eens 11 Stylus Replacement 66 cece tee eee etna 14 Stylus Belt Replacement 6 cece eee ence teen eee eens 15 Do s and Domt S 0 ccc cece cent ee ete ett eee 16 Troubleshooting 0 cece eee eee enna 16 Advanced Operation 0 0 0 ccc eee teen eee n ae aes 17 Surface Clarity Control SCC 2 0 6 6c c eee eee eee eee 17 Feet Fathoms Meters 000s cece eee eee eee eee 18 Transmitter Pulse Width a ononaria eee nnne 18 Discrimination 20 0 c cece ene eee teens 20 Transmit and Print Alternate 6 ees 21 level whereas the highest value 4 is the strongest level and should be used only when severe noise is present To use the Discrimination func tion simply press the level of noise rejection desired from 1 to 4 then press the DISC Discrimi nation Key There should be an immediate change in the amount of noise present on the paper The Discrimination setting is printed at the bottom of the paper each time the level is entered and at inter vals thereafter The Discrimination function can be disabled at any time by press ing 0 DISC Example Enter a Discrimination level of 2 Press 2 DISC Result sehen hg oie ee ta Nee seca oa PTE cane AEN es SE ewe St ace Figure 40 Transmit and Print Altern
23. noise and still have good 9 Feet Fathoms Meters The X 15A will display the depth in feet fathoms or meters Al though the unit will revert back to the feet mode whenever power is turned off it is simple to change to any mode you wish by pressing the 2nd key and then 1 for feet 2nd 2 for fathoms and 2nd 3 for meters When the unit is in the Feet mode only one L will be dis played In the Fathom mode two L L s will be displayed Three U L L s will be displayed in the meters mode Example Display Fathoms Press 2nd 2 Result Pg y Q em A 4 B a a E l Vg ea a G Eg ee B to uu Bo Figure 38 By looking at the number of Li s one can determine the depth display mode that the unit is in i e Feet Fathoms Meters Transmit Pulse Width The noise suppression system in the X 15A is a patented pulse length discrimination suppression circuit and is the same as the one used on all the Lowrance s vari able suppression flashers and graphs Basically it works on the principle that most noise pulses are of relatively short duration If the receiver circuit can be ad justed so that it will accept only long pulses then the short pulses will be cangelled out and only the desired information fish bottom structure etc will be displayed Of course the transmitier s pulse length would have to be increased at the same time so that the re
24. nted on the page By enabling the Transmit and Print function the transmit ter is triggered only half as many times as normal putting less energy into the water same amount of power just not as often which reduces the amount of noise seen 4 Slows the paper speed A sig nificant amount of paper can be saved by using the Alter nate Transmit and Print feature 21 resolution For example if a 50 ws initial transmitter pulse length is selected and the Suppressor control is rotated to maximum the transmitter pulse length would be 850 ps Returning the Suppressor control to minimum will restore the unit to a 50 ws transmitter pulse length The X 15A will display the initial transmitter pulse length at the bot tom of the paper when you over ride the micro computer To distinguish the initial transmitter pulse from the other information printed on the paper the graph will print P 100 if the pulse is set to 100 micro seconds A 50 us initial pulse length would be dis played as P 50 To set the initial transmitter pulse length simply press on the keyboard the initial pulse length desired and then press the PULSE key For example to set the initial transmit pulse length to 150 micro seconds press 1 5 0 PULSE This will override the micro computer s selection and set the initial transmitter pulse length to 150 micro seconds P 150 will be printed at the bottom of the paper to signify that the en
25. on the sty lus holder 5 Before installing the new sty lus be sure it is bent properly by camparing it to Figure 33 6 Refer to Figure 34 to be sure the new stylus is positioned correctly under the tabs on the holder Be sure it moves freely in the two slots If not bend the stylus away from the edge it is rubbing on until it does move freely 7 After installing if the stylus won t print all the way down the paper as shown in Fig ure 35 bend the right leg down so that more pressure is ex erted against the stainless steel plate If it still does not print all the way bend the left leg down more but not so far that it digs into the paper 8 Close the front of the case Latch both catches on the top of the case 14 er fish arches at low speeds and keeps high speed information from being compressed The paper speed should be turned down when using the unit in deep water This will prevent gaps from ap pearing in the record In fact the microcomputer will automatically slow the maximum speed of the chart paper when operating in deep water The chart below gives the points where the maximum speed of the paper is slowed RANGE PAPER SPEED 10 110 Fastest Paper Speed 120 490 Medium Fast Paper Speed Medium Slow Paper Speed 800 amp Below Slowest Paper Speed The chart paper may be slowed even further by adjusting the pa per speed control Remember if gaps in the record appear turn the
26. or eliminated by using the MARK SCC control key on the front panel keyboard To use the SCC press key 1 thru 4 and then the MARK SCC key 1 has a minimum effect on surface clutter 4 has the max imum effect on reducing surface clutter 2 and 3 have intermediate effects The amount of SCC that is used is printed at the bottom of the chart paper If one level of SCC is used then S 1 is printed Two levels S 2 etc The effect on surface clutter should immediately be seen Use only the amount of SCC required to reduce the clutter as fish sig nals can be eliminated by using this method also lf you wish to turn the SCC function OFF simply press 0 MARK SCC and the SCC function will be disabled Example ENTER A SCC LEVEL OF 2 Press 2 SCC Result See Figure 37 17 wheels by reversing the proce dure used to remove the old one BE SURE the fingers of the new stylus are pointed UP 6 Close the front of the case Latch both catches at the top of the unit MAINTENANCE NOTE The stylus may be damaged if it is in front of the pla ten when the platen assembly is pulled down Always move the stylus to the back side of the pla ten when changing the paper rolls Remember to move the belt down to remove the stylus Black carbon dust is created dur ing the recording process Use a soft oil free rag to clean the viewing door and metai platen be hind the paper Low pressure compressed air may be use
27. returned full shipping in structions will be provided SCHEMATIC DIAGRAM AND PARTS LIST Should you desire a Schematic Diagram and Parts list for your Lowrance TRUELINE RECORD ER send 1 00 to PARTS LIST Lowrance Electronics Inc 12000 East Skelly Drive Tulsa Okla homa 74128 Be sure and give us the Model Number and Serial Number of your SONAR INSTRUMENT NOTE This sonar uses LPG 605 Chart Paper 1 INTRODUCTION The Lowrance X 15A is a highly sophisticated recording depth sounder Thanks to a micro com puter the X 15A can do more than any other sonar unit in its price range plus many that cost much more Thanks to a waterproof key board full control of the system is at your fingertips to meet the changing demands of varying bot tom conditions water depth and boat speed You can select the unit s sensitivity suppression level upper and lower depth range pa per speed GRAYLINE and many more features The patented Lowrance variable suppression system combined with the new Discrimination feature not only fil ters out false signals without dis torting the real ones but is synchronized with the GRAYLINE function to provide clear signals under all conditions 2 HOW IT WORKS When the unit is turned on an electronically regulated motor drives a lightweight belt located at the right edge of the recording pa per The stylus is attached to this belt When the stylus is at the top of the paper a sm
28. turn echoes would be accepted by the receiver This is exactly what the Low rance suppression system does The transmitter s pulse length is increased by the front panel sup pression control and the receiver tracks the amount of increased pulse length cancelling out any narrow noise pulses and display ing only the return echoes from fish or the bottom etc Note Re ceiver sensitivity is not diminished at all by this process The only disadvantage to this system is resolution or the ability to separate targets is diminished when the pulse length is in creased A 200 ws micro second transmitier pulse length used on the X 15A when power is first turned on will allow the unit to display two fish or targets that are only 6 inches apart In other words if two fish that are 6 inches apart are displayed on the graph paper they will show up as two separate arches when the trans mitter is operating with a 200 ps pulse length Now if we increase the transmitter s pulse length to 400 ys by rotating the Suppres sor control clockwise those same two fish arches will blend together and show up as one fish or pos sibly even a blob on the paper With a 400 ps transmit pulse width those same two fish will have to be at least 12 inches apart before they will show up as two separate arches on the graph This is why it is important to leave 1h the section entitled Advanced Op eration This chapter w
29. ust hole and rotate the control on the circuit board until the zero line is at the desired position Note This may also be adjusted with the unit turned OFF Adjust the control then remove the screw driver and turn power back ON Repeat until the zero line is in the desired position iV HOW TO READ GRAPHS Arched Signatures A remarkable advantage of the X 15A is that it can record indi vidual fish with a characteristic arched mark that separates them from their stationary surroundings The reason for this is shown be low The distance to a fish when it moves into the sonar s cone of sound is shown as A When the fish has moved to the center of the cone the dis tance to it will be shorter line B and as it moves out of the cone the distance will increase again as shown in line C 60 i Figure 22 lf a partial arch occurs most of the time on your unit the mark curves up but not back down or vice versa it is because the trans ducer is not pointed straight down If your transducer is mounted on the transom adjust the transducer until the fish show the distinctive arched signature This may take some trial and error until the cor rect mounting is achieved Sharp well defined signatures will occur most often when the Sensitivity knob is set at the point or higher Remember that there must be some movement between the boat and the fish to develop the arched mark
30. wo notches in the core with the tabs on the lower take up spool Slide a fresh roll of paper in position on the supply side shaft on the right side of the platen assembly The paper must spool off the bottom of the roll See Figure 29 Draw the end of the paper across the face of the platen around the friction roller over the take up core and tape it 5h E bl p I E BD Figure 17 tions to show segments from the surface to the bottom and any where inbetween Representative samples of chart paper are shown in the back of this manual If you wish to display your depth settings at any time simply press either the UPPER LIMIT or LOWER LIMIT keys The current range will be printed on the paper immediately This will not change the depth setting LINES When the X 15A is first turned on depth lines will be printed on the paper If you desire to turn the Lines off press the LINES key To turn the lines back on press the LINES key again Example Turn lines off Press LINES key Result AT ORES E pi D 1 L bn B I y Fiaure 18 MARKER An event marker function is in cluded in the X 15A so that events may be marked when desired To use the marker simply press the MARK key and a vertical line will be displayed across the entire page Hold the MARK key down and a vertical line will be printed _ for as long as the key is held down Example
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