INSTALLATION AND OPERATION MANUAL MODELS LRG-1500A AND LRG-1500M TRULINE RECORDER Printed in U.S.A. 988-0088-02 LOWRANCE ELECTRONICS, INC. L! 12000 F. SKELLY DR.. TULSA. OKLA.
NOTICE Periodicallywash the Transducer Face with soap and water to remove anyof/film thatmaycollect Oiland dirt on the face will reduce sensitivityor may evenpreventsounding. GOT A PROBLEM? LET US HELP! If you havea problem with your sonar unit, please give us achance to help before sending it in for repair. Assistance can often be extended by telephone or letter. Write or call one ofour Authorized Service Centers ortheLowrance Electronics, Inc., Customer Service Department in Tulsa, OK.
. SPECIFICATIONS — LRG-1500A/M Depth Ranges Operating Frequency INDEX 1SOOA 0- 60 feet 0-120 feet 0-360 feet 1500M 0-18 meters 0-30 meters 0-60 meters Whatltls .192 kHz (192000 cycles per second); accuracy is within 0.6 percent " 200-l200ps. Pulse Length: (duration of pulse): Operating Voltage: Minimum Maximum Operating Current 10 volts DC 15 volts DC 0.7 to 1.8 amps depending on printing density and output i power. Output Power .900 watts typical peak-to-peak (112 watts RMS) 8.5 lb. (3.
WHAT IT IS 'Sonar" is an abbreviation meaning "sound navigation and ranging." It was developed as a means of tracking enemy submarines during World War II. Sound — whentransmitted through water — travelsat approximately 4800 feet per second as compared to 1100 through air.
MAINTENANCE NOTE: The stylus may be damaged if it is in front of the platen when the side of platen assembly is pulled down. Alwaysmove the stylus to the back belt down to move the the rolls. Remember when the platen paper changing to remove stylus. Black carbon dust is created during the recording process. Use a soft, oil-free rag to clean theviewing doorand metal platen behind the paper.
WI-tAT IT TELLS YOU Small boat sonar systems are routinely used to measure water depth, examine bottom contours, and locate fish —. but the capability of the LAG-i500A/Mgoesfarbeyond theordinary.
E—" I' Fig. 35 Figure 37 -- \) D. THIRD ECHO E. FISH SIGNALS F. TREES A. ALGAE AND PLANKTON — B. TRUE BOTTOM SIGNAL C. SECOND ECHO Fig. 6 The LRG-1500A/M is a complete sonar. Its controls are simple enough for the occasional fisherman, and flexible enoughto satisfythe most demanding pro.We encourage youto studytheremainderof this booklet to get the mostfromyour investment and to boostyour boating and fishing pleasure. rvt, 1j;;;. A -. ,.*B - -. . B 7.
INSTALLATION STYLUS REPLACEMENT MOUNTING Anyconvenient areais suitable for mounting, providing the unitcanbetilted forthe best viewing angle. There are eight mounting holesin the base of the gimbal bracket for wood screws or thru-bolts. If necessary, a wooden stiffenercan be used on the backside of thin fiberglass panels. Ifthe desired mounting location is closerthan18"to a magnetic compass, a trial run should be made,with the unitin operation, to be sure the compass readings are not affected.
10. Push the platen assembly back to its operating position. Be sure it engages the catch inside the top of the case. (See Figure 32.) OPERATION SCALE KNOB — used to select recording depth.
8. Draw the end of the paper across the face of the platen, around the friction roller, over the take-up core, and tape it squarely to the take-up core. (See Figure 30.) (Hint: small strips of tape may be stored inside -t housing.) — Fig. 10 SENSITIVITY: ¼ SETTING ONLY THE BOOM SIGNAL IS DISPLAYED. ALL FISH SIGNALSARE Lost Ag. 30 Fig. 11 SENSITIVITY: ¾ SETTING A. TREE B. THERMOCLINE c. BAITFISH SCHOOL 0.
6. Remove the emptysupply core fromthe right side in the same manner. Alignthe two notches in thecorewiththetabsonthelowertake-upspool. (See Fig. 28) Push the paper retainer knob in and rotate it until it locks into place. NOTE: Both LPG-602 and LPG-603 chart paper can be used in this unit. However, to use the paper core from the LPG-602 chart paper on the take-up side of the chart drive, notches must be cut into the core. These notches should be 1/4' wide by 3/16' deep on both sides of the core.
HOW TO READ GRAPHS "ARCHED SIGNATURES" — A remarkable advantage of the LRG-1500 A/M is that it can record individual fish with a characteristic arched mark that separates them from their stationary surroundings. The reason for this is shown below. The distance to w a fish when it moves into the sonar's cone of sound is shown as "A' in the drawing.
rrv' 3. Move the stylus belt DOWN, (on the right side of the viewingarea), to position the marking styluson the back side ci the platen. NEVERmove the belt up — the stylus may be damaged. SPECIAL NOTE: The stylus may be damaged lithe platen assembly is pulled downunless the stylushasbeen movedto the backside of the platen. 4. Pull out and downon thetabatthe top, centeroftheplaten assemblyto expose the paper spools. (See Figure 25.) Fig. 25 Fig. 18 High Speed (46 MPH.) High Speed (46 M.P.H.
PAPER LOADING -. pt\ Afl\pr 2._ -. ,— — CAUTION — r High voltage is present in the electronicsection when the unit is turned on. 4 1. TURN THE UNIT OFF. 2. Release both catches on thetopofthe case. Pull out anddownon the top of the case front to expose the platen assembly. (See Figure 24.) Fy23 Fig. 21 A. B. A. A FISH SUSPENDED FISH DRIFTING UNDER BOAT. FISH MOVED FROM 13½ FEET TO 21 FEETTO 12 FEETWHILE DRIFTING/SWIMMING WITHIN THE CONE OF SOUND. JIGGING A LEAD-HEADLURE UNDER BOAT B.
