the empty core onto the take-up shaft. (See Figure 23) Align the two notches in the core with the tabs on the lower take-up spool. 7. Slide a fresh roll of paper in position on the supplyside shaft on the right side of the platen assembly. The paper must spool off the bottom of the roll. (See Figure 24) 8. Draw the end of the paper across the face of the platen, around the friction roller, over thetake-upcore, and tape it squarely to the take-up core. (See Figure 25) Small pieces of tape may be stored inside the housing for this purpose. Close the top of the platen assembly by pressing the two tabs togetheron the paper retainer and returning the retainer back to the operating position. (See Figure26) 9. 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 · · Figure 18 Figure 19 -- the stylus may be damaged. (See Figurel9.) SPECIALNOTE: The stylus may be damaged if the platen assembly is pulled down unless the stylus has been moved to the back side of the platen. 4. Pull out and down on the tab at the top center of the platen assembly to expose the paper spools. (See Figure2o.) 5. To remove the full take-uproll and the empty supply spool, press the two metal tabs togetheron the top of the platen assembly, and pull out and down on the paper retainer. (See Figure 21.) The full takeup roll can now be easilly removed from the paper core shafts. (See Figure 22.) 6. Pull the empty supply core from the right side in the same manner. Install F Notice--Use only genuine Eagle EGP-1 graph paper Substitute paper does not give satisfactory performance in Eagle graph recorders. Figure PDF compression, OCR, web-optimization with CVISION's PdfCompressor 21 11 against the platen.( Figure 27) 10. Push the platen assembly back to its operating position. Be sure it engages the catch inside the top of the case. (See Figure2O) 11. Closethe front of the case. Latch both catcheson the top of the case. 12. Turn the unit on. Movethe Chart Speed knobfully clockwise. Watch the paper long enough to be sure it is moving smoothly and evenly across the platen. If the paper flutters or begins to run "uphill", repeat step 8. 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 catcheson the top of the case. Pull out and down on the top of the case front to expose the stylus belt. (See Figurel8.) 3. The stylus belt rides over two wheels located at the right edge of the platen assembly. Move the front of the belt DOWNto position the stylus at the center of the platen. 4. Hold the stylus belt stationary with one finger, and remove the old stylus by starting at its left edge and moving it out from underthe tabs on the stylus holder. 5. Before installing the new stylus, be sure it is bent properly by camparing it to Figure 28. Figure 17 EAGLE 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 a fish when it moves into the sonar's cone of sound is shown as "A" in Figurel6. When the fish has moved to the centerof the cone, thedistanceto it will be shorter, (line "B"), and as it moves out of thecone, the distance will increase again as shown in line "C". If a partial arch occurs most of the time on your unit (the mark curves up, but does not curve back down or vice-versa), it is because the transducer is not aimed straight down. Sharp, well-defined signatures will occur most often when the Sensitivity knob is set at the ¾ point, or higher. (See "A", Figurel7). Remember, too, that there must be some movement between the fish and boat to develop the arched mark. of a warm and cool layer of water and thicknessof 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 impor- is called a thermocline. The depth 6. Refer to Figure29tobe 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 Figure3O, bend the right leg down so that more pressure is exerted againstthe 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. tant to thefisherman because they are areas which fish are active. Manytimes baitfish will be above the thermocline while larger game fish suspend just below it. See "B", Figure 17. Your EAGLE Mach 1 can detect this invisiblelayer in the water, but the Sensitivity knob will probably have to be set at the 1/2 point, or higher. PAPER LOADING CAUTION -- High voltage is present in the electronic section when the unit is turned on. 1. TURN THE UNIT OFF. Thermoclines The temperature of water in the lake is seldom constant from top to bottom. Layers of different temperatures form, and the junction 9 . 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 assembly. (See Figurel8.) Figure 27 3. Move the stylus belt DOWN, to positionthe marking stylus on the back side of the platen. NEVER move the belt up PDF compression, OCR, web-optimization with CVISION's PdfCompressor 12 Figure 28 Figure 29 Figure 14 ZERO ADJUST ZOoM "OFF" Figure 15 MARKER ZOOM"ON" Occasionally, when changing the stylus or stylus belt, the zero does not print at the same place near the top of the chart paper. By rotating the BOTTOM ZOOM control counter-clockwise the zero line can be moved towards the top of the chart paper, clockwise rotation moves the zero line towards the bottom of the paper. The control has been designed so that even if the record goes off the bottom of the paper, it- can still be adjusted to print on the paper. The ZEROADJUSTcontrol will function if the BOTTOM ZOOM feature is on or off. causesa verticalline to be printed on the paper. Hold the Marker button down and the unit will print the verticalline for as long as the button is held down. END OF PAPER MARKER The graph paper used in the MACH 1 has a red line printed at the bottom of the paper to signify when there is only 2 to 3 feet of paper remaining. Pressing the Marker button STYLUS BELT REPLACEMENT CAUTION -- High voltage is present in the electronic section when the unit is turned on, IV HOW TO READ GRAPHS "Arched Signatures" A remarkable advantage of the 1. TURN THE UNIT OFF. 2. Release both catcheson the top of the case. Pull out and down on the top of the case front and the platen to expose the stylus belt. Figure 16 13 PDF compression, 8OCR, web-optimization with CVISION's PdfCompressor 3. The stylus belt rides over two wheels located at the right edge of the platen assembly. Refer to Figure 1 on page 2. Move the front of the belt DOWN to position .the stylus at the center of the platen. 4. Grasp the belt at the stylus holder with the thumb and forefinger and move it gently -I Figure 31 to the left while pushing the belt off the wheels with the other forefinger. (See Figure 31.) 5. Position the new belt on the wheels by reversing the procedure used to removethe 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. is ON. No attempt should be made by any unauthorized person to modify or repair the electronic section. All electrical connections should be checked periodically and cleaned as necessary. The face of the transducer, if mounted on the transomshould be washed periodically with mild soapy water to remove any accumulated rod grime or oily film. This is essential to have good contact between the transducer and the water. Periodically, the rubber roller on the paper drive should be cleaned with a cloth dampened with alcohol, to improvethe friction on the drive shaft. DO SECTION Do carry a spare fuse, stylUs belt, and roll of paper. Do use the empty cardboardcore take-up post. Q Figure 11 p.r r I GRAYLINE "OFF" Figure 12 RANGE GRAYLINE "ON" MAINTENANCE NOTE: The stylus may be damaged if it is in front of the platen when the platen assemblyis pulled down. Always move the stylus to the back side of the platen when changing the paper rolls. Remember to move the belt down to remove the stylus. Black carbon dust is created during the recording process. Use a soft, oil-free rag to clean the viewing door and metal platen behind the paper. Low pressure compressed air may be used to blow dust out of the case and away from moving parts if the air per speed may also be slowed when not looking for fish or to simplyconserve paper. GRAYLINE CONTROL This control determines the depth scale displayed on the chart paper. (See Figure 13) BOTtOM ZOOM By pulling out the knob, the feature allows you to "Zoom in" on the lower half of the range being displayed on the graph. In other words, with the Range control set to the 60 foot range, and the Bottom Zoom control pushed in (OFF), the scale printed on the chart paperwill be 0 to 60 feet. (See Figure 14.) With the Bottom Zoom control pulled out (ON), the scale will be 30 to 60 feet. This allows you to double the size of anytarget or feature in the lower half of any depth range. (Figure 15.) ZERO ADJUST from the last roll of paper on the future reference. Do keep the recorded graphs for 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 is dry and free of oil. After everyfive rolls of paper, the stylus belt and the wheels it rides on should be wiped clean with a soft, rag moistened with alcoholto remove carbon dust. Strong solvents or abrasive cleaners should not be used. All mechanical connections should be checked periodically to be sure they haven't worked loose. HIGH VOLTAGE is present in the transmitter sectionwhen the unit 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 returns 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 the control too far or it will gray line on the targetcompletely, showing no black, which makes the target difficult to see. There are 12 ranges: 0-10 feet 0-20 0-40 0-60 0-80 0-100 0-140 0-200 0-300 0-400 0-600 0-1000 @ERANGE IOU down when the stylus is at the front. 60 60 --.... 40 ---e 20 10 --p -. . --2O0 140 &___300 Don't store any objectsinside the case or behind the viewing window. (Except for small pieces of tape.) -- r--60O --1000 r GRAYLINER '<_PAPER SPEED Don't forget to tape the paperto 14 Figure 13 0 44 PDF compression, OCR, web-optimization with CVISION's PdfCompressor 7 sound pulse hasto travel, the weaker it becomes. By broadening the pulsewidth, in essence, a larger signal is transmitted and it is easier for the receiver to detect it. For this reason, the micro-computer in the MACH 1 automatically increases the initial pulse width of the unit as deeper ranges are selected by the operator. NOTE: Initial pulse width is the pulse width of the unit when the Suppressor control is turned to minimum. INITIAL TRANSMIT PULSE WIDTH (micro-seconds) 110 150 the range control is set to 300 feet, and the Suppressor control is rotated to the maximum clockwise position, thetransmitter pulse width would be 1100 microseconds. (300 initial pIus 800 equals 1100 micro-seconds.) Paper Speed Control This knob adjuststhe speed of thechart paper. For good detailed graphs,in shallowto medium depths, turn the paper speed control up to at least ¾ when trolling. For best details,turn it up to maximum. This will show proper 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 appearing 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. the take-upcore. Don't rotatethe stylus belt up. Don't use oily cloths, strong solvents, Symptom or abrasive cleansers. TROUBLESHOOTING SECTION Recorded marks are very heavy; paper is torn by stylus. What To Do Bend the stylusslightly to reduce pressure on paper. Symptom On/Off switch is "ON", but the stylus and paperdon't move. What To Do Check fuse; check connections at battery for tightness and corrosion. ...