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Mayan OPERATOR INSTRUCTION MANUAL
CONGRATULATIONS!
Your new TESORO Metal Detector was designed to provide you with many happy hours of enjoyment in the most
rewarding hobby I can think of – treasure hunting. Ahead of you lie fascinating and exciting experiences as you step into the
past – uncovering artifacts lost by past generations. I wish we could share these experiences with you, and we wish you the
best of success.
Your TESORO Metal Detector is capable of meeting your needs in any conceivable treasure hunting situation. As with
any detector, operating skill and familiarity with this instrument are probably the limiting factors in determining how successful
you will be. We recommend that you read this manual and understand fully before attempting to use the instrument in the
field. As you become more familiar with your detector through practice, your rate of success will increase dramatically.
The TESORO Metal Detector is a precision electronic instrument, which will last for years if properly cared for. Treat it
right and it won't let you down.
GENERAL DESCRIPTION
The Mayan is a TransmitterReceiver (TR) type of detector that operates in the Very Low Frequency (VLF) portion of the
Radio Frequency (RF) spectrum. The detector utilizes the natural phenomena of the phase delay of all targets to provide
mineralfree or groundcompensated response in the normal mode of operation, and to provide discrimination capability in the
discriminate mode.
The Mayan is an extremely sensitive detector, but because of its pushbutton MODE CHANGE/TUNING SWITCH is the
easiest "one handed" VLF/TR Discriminator to use.
As with any detector, the familiarity of the user with the instrument will have a great deal to do with how successful the
treasure hunter is. We recommend that you read and understand this manual fully before attempting to use the instrument in
the field.
Be sure to fill out and mail your warranty registration card to validate your warranty.
ASSEMBLY
Assembly of the Mayan is very simple, and requires no special tools. The only assembly required is to mount the
searchcoil to the end of the lower stem and to install the lower stem and lock nut assembly to the upper stem.
1. Depress the two buttons on the upper end of the lower stem, and slide it into the upper stem. Push the lower stem
up so that the buttons click into the third set of holes from the end of the upper stem.
2. Insert the pole tip between the mounting ears of the searchcoil, after removing the screw and thumb nut. Align the
holes in the pole tip and those in the mounting ears.
3. Insert the coil mounting screw through the coil and pole tip. The screw head should be on the side of the searchcoil
where the cable comes out.
4. Install the thumb nut on the screw and tighten by hand.
5. Wind the searchcoil cable around the pole by depressing the spring buttons and turning the lower stem around
several times as necessary.
ADJUSTMENT
The searchcoil angle and stem length should be adjusted so that the unit is not uncomfortable or tiring after long periods
of use. The stem length is adjusted by depressing the spring buttons and extending or shortening the pole till they click into
the holes that give you the most comfortable setting. The coil should be about one inch above the ground while standing erect.
Adjust the angle of the searchcoil, so that the coil is parallel to the ground. Tighten the searchcoil thumb nut by hand to
maintain this setting.
The arm rest on the rear of the handle can be moved forward by removing the screws and nuts, and reinstalling the
assembly into the most forward set of holes.
Good Hunting! Jack Gifford
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Summary of Contents for Tesoro Mayan
- Page 1 Product Mayan OPERATOR INSTRUCTION MANUAL Detectors Coils Accessories CONGRATULATIONS! Catalog Your new TESORO Metal Detector was designed to provide you with many happy hours of enjoyment in the most Dealers rewarding hobby I can think of – treasure hunting. Ahead of you lie fascinating and exciting experiences as you step into the Information past – uncovering artifacts lost by past generations. I wish we could share these experiences with you, and we wish you the best of success. Frequently Asked Your TESORO Metal Detector is capable of meeting your needs in any conceivable treasure hunting situation. As with Questions any detector, operating skill and familiarity with this instrument are probably the limiting factors in determining how successful About Tesoro you will be. We recommend that you read this manual and understand fully before attempting to use the instrument in the field. As you become more familiar with your detector through practice, your rate of success will increase dramatically. Manuals The TESORO Metal Detector is a precision electronic instrument, which will last for years if properly cared for. Treat it Field Tests right and it won't let you down. Articles Good Hunting! Jack Gifford Testimonials Customer Finds GENERAL DESCRIPTION Forums Service The Mayan is a TransmitterReceiver (TR) type of detector that operates in the Very Low Frequency (VLF) portion of the Radio Frequency (RF) spectrum. The detector utilizes the natural phenomena of the phase delay of all targets to provide Warranty Repair mineralfree or groundcompensated response in the normal mode of operation, and to provide discrimination capability in the discriminate mode. Contact Us The Mayan is an extremely sensitive detector, but because of its pushbutton MODE CHANGE/TUNING SWITCH is the ...
- Page 2 Audio Output 2 1/4" speaker Headphone Compatibility 1/4" stereo earphone jack Weight (may vary slightly) 3 lbs. 12 oz. nominal 12 volts DC Battery Requirement 8 AA penlight batteries Battery Life (typical) 15 to 30 hours Optimum Temperature Range 30° to 100° F Optimum Humidity 0 to 75% R.H. Normal (All Metal) Operating Modes TR Discriminate CONTROLS The function of the front panel controls the Mayan are as follows. 1. ON/OFF, TUNING, BATTERY TEST. This control is used to tune the detector to it's most sensitive level (Threshold) regardless of which mode of operation is being used. It also controls the power for the detector, and activates the automatic battery test circuitry. The MODE control should always be in the NORMAL ONLY position and the MODE/TUNING switch depressed when setting the unit to threshold with the TUNING control, or when checking the batteries. The batteries should be tested after about 10 minutes of operation, and with a moderate to heavy amount of sound. Turn the detector off momentarily, and then back on, turning the TUNING control completely clockwise to make maximum sound. The detector will remain in the battery test mode for about 3 to 5 seconds. A meter reading of .6 or above indicates the battery strength is adequate for proper operation. If the meter reading is below .6, replace the batteries. 2. GROUND ADJUST. The control is used to adjust the detector so that it doesn't respond to the mineralization in the ground when used in the NORMAL (all metal) mode. While the control will adjust the ground response in either NORMAL mode, it should not be adjusted when the mode switch is in the NORMAL AUTOMATIC TUNE position, as the auto tune will affect the detector's response. 3. DISCRIMINATE LEVEL. This control is used to adjust the detector's response to unwanted metallic trash when used in the Discriminate mode. At the lowest setting "0", the detector will eliminate most iron objects, but will still respond in a positive manner to light foil, bottle caps, pull tabs and most other metallic items. As the knob setting is increased, response to more of these metallic trash items is reversed so that these objects give no response. ...
- Page 3 INTENSITY. In any of the automatic tuned modes, the meter will indicate relative signal strength, as indicated on the Intensity scale. This reading is affected by the automatic tuning, and will always return to zero if the coil is stopped over the target. Both of these target indicating modes (DEPTH and INTENSITY) are extremely useful aids in pinpointing a target. Both readings will reach a maximum forward deflection of the meter needle when the coil is centered directly over the target. Further, the meter of the Mayan is placed in a location where it is readily visible to the user. TUNING No detector, regardless of how powerful it is, can provide optimum depth if it is improperly tuned. In fact, the more powerful a detector is, the more critical the tuning becomes. Less powerful units are more tolerant of operator misadjustment, but are not capable of the depth of a properly tuned high power detector such as the Mayan. If you will remember just one thing, and adjust your detector accordingly, you all achieve satisfying results. The thing to remember is, always operate the detector at "Threshold" (with a very slight amount of sound). Any time you operate a detector completely silent, you are losing depth. If the sound is too loud, you will also lose depth, because the weak signals from deep targets will not be as noticeable. Following the tuning procedures outlined below will help you properly tune your Mayan to allow you to operate it at threshold, and will allow you to fully utilize its performance capabilities. A. NORMAL MODE TUNING.Normal Mode Tuning. 1. Set the MODE Switch to NORMAL. 2. Turn the TUNING control to ON, depress the TUNING/MODE CHANGE switch in the handle, and turn the TUNING control up until the detector is at threshold, (that point where it is just beginning to make sound). 3. After the battery test period has elapsed, release the TUNING/MODE CHANGE switch with the searchcoil about one foot above the ground. 4. Hold the searchcoil about two feet above the ground, and release the pushbutton. 5. Lower the searchcoil to the ground, and turn the GROUND ADJUST control up or down as necessary to bring the detector back to threshold. Do not push the button or turn the tuning control during this step. The detector is now ready to use in the NORMAL modes. Raising and lowering the searchcoil slowly should not appreciably change the tuning threshold. If it does, the coil was probably over a target when it was adjusted. Find a spot free of metallic targets, and repeat the procedure if necessary. Raising and lowering the searchcoil abruptly may cause a momentary "bobble" in the threshold tone in heavily mineralized ground, but will not affect your normal operation. In some cases of extremely high mineralization, it may be possible to compensate the unit only for the first few inches from the ground. In this case, release the button in step three, with the coil about 2 to 3 inches above the ground. B. DISCRIMINATE MODE TUNING. 1. Set the MODE switch to DISCRIM. ...
- Page 4 A rejected target will cause a null or quiet period as the coil passes over the target. During this null, the automatic tuning is trying to maintain threshold by tuning upward. When the coil leaves the target, this upward tuning now causes an audio response until the automatic tuning can once again sense the tuning error and correct itself downward. The automatic tuning speed is slower than the target speed, so this overshoot sound is best described as a 'bonk' or 'boing'. Try laying a coin and item of metallic trash such as a nail or steel bottlecap on the ground, and listen to the difference in response as the trash is rejected in the DISCRIM AUTO TUNE mode. You will quickly learn these characteristic sounds. Whenever the push button TUNING/MODE CHANGES switch is depressed and held, the detector will change from its selected primary mode to automatic tuning in the other basic mode. Holding the switch down in either NORMAL mode will cause the detector to operate in automatic tuned DISCRIM mode, until the switch is released. Holding the switch down in either DISCRIM mode will cause the detector to operate in automatic tuned NORMAL mode until the switch is released. FIELD USE The detector should be held in a position that is comfortable for you. Swing the detector from side to side in about a three foot arc. The Mayan does not need to be hurried, so go at a pace that doesn't wear you out. Keep the detector tuned so that it is just beginning to buzz. In Normal Mode the detector ignores the ground, if properly adjusted, so this is easy to do. In Discriminate, the ground will affect the detector, so you should sweep the detector at a constant height above the ground (about 1 inch). Irregularities in the ground, as well as in your sweep height will cause variations in the tuning. These changes will usually be much slower than the abrupt signal caused by the coil passing over a good target. A little practice with a coin buried about 1 inch will enable you to pick out the target sound readily, as compared to the background variations. Turning the Sensitivity down will make it easier to maintain threshold. Always operate in Discriminate with the Sensitivity control set only as high as will allow you to operate in the unit at threshold. In areas with well kept lawns, the easiest way to maintain a constant searchcoil height is to allow the coil to rest on the grass as you sweep from side to side. In rough and rocky areas it is best not to “scrub” the coil on the ground, as the rocks will act like abrasives, and wear away the coil bottom. Since the combined MODE CHANGE/TUNING SWITCH allows the detector to be operated with just one hand, it is very easy to search in Normal mode until a target is found, and then switch to Discriminate to check whether it is a good target or junk. Remember that when holding in the push button to change modes, the detector will always be in the automatic tuned mode. It may help to adjust the threshold slightly higher than the point where sound is just barely audible, as lightening for the null on trash items is just as important as listening for the increase of sound for good items, when you are trying to classify a deep target. If you can't get a definite response of either type, dig it. Also, the slightly higher threshold setting will help emphasize the difference between the "bonks" and "beeps". It also helps when classifying shallow targets, to listen to the ...
- Page 5 In the Discriminate Mode, the tuning will not be affected by changing the DISC LEVEL control setting, so it is fairly easy to identify the target by increasing the DISC LEVEL control as the coil is passed repeatedly over the target, until the target response goes away. Being familiar with your detector and where typical junk items are rejected can save you much needless digging. TO properly utilize this identification feature, you will need to be tuned to threshold at the same height as you are passing over the target so the ground minerals do not alias the readings. Automatic tuning is helpful here, as the auto tune circuitry will continuously keep your detector tuned to threshold. You will only need to sweep the coil a few inches across the target to get the proper response, unlike "motion" machines which may he to swing several feet for proper response. One thing to remember, though, is that in Discriminate Mode, it is best not to use any higher Discriminate Level setting than necessary. Nickels and most small rings are rejected when the DISC LEVEL is set to reject pull tabs on all TR Discriminators. If you don't dig any junk at all, you are surely passing up a lot of other good finds too. Set the DISC LEVEL only high enough to suit the conditions where you are searching. BATTERY REPLACEMENT The Mayan has an automatic battery test circuit so you can always know you're getting top performance from your detector. The batteries should be tested after the detector has been operated for about ten minutes, and while the detector is making a loud noise, so the batteries are properly loaded. To check the batteries, simply turn the Mayan of for about five seconds, and then turn it back on and rotate the TUNING control completely clockwise. Depress the TUNING/MODE CHANGE button if it is not making lots of sound. The meter will indicate the battery strength for about four seconds. If the meter reads less than .6 during this period, replace the batteries. To replace the batteries, pull the large knob on the battery door on the front of the unit. The entire door will pop out. Remove the battery pack from the detector, and then remove the batteries from the pack. Replace the new penlight batteries into the pack, observing the polarity indicators that are embossed into the insides of the pack. Slide the pack back into the detector, making sure that the battery clip lead is connected to the pack. Install the battery door flange into the top of the cutout in the chassis, and push the nylon fastener into the hole at the bottom of the chassis, making sure that the plungers are still pulled out. Then push the plunger back in to lock the door in place. Should you desire to do so, rechargeable Nickel Cadmium batteries can be substituted for standard penlight cells. Individual AA size cells are readily available at most electronic supply stores, as well as the chargers for them, and they can be inserted into the standard 8 holder used in your Mayan. The initial battery check reading will be slightly lower, but will not drop as much with use, until the batteries are completely discharged. GENERAL CARE AND USE If the detector is to be stored for a long period of time, it is best to remove the battery pack from the detector. This will prevent internal damage to the detector if the batteries should leak. The searchcoil is waterproof and may be submerged in either fresh or salt water. Caution should be exercised to prevent water from entering the chassis, where it could damage the electronic circuitry, or from entering the upper stem, where it could leak into the chassis through the push button cable hole. After the coil is used in salt water, the coil and lower stem assembly should be rinsed well with fresh water to prevent corrosion of the metal parts. There are several good books to help the beginner learn how to use the detector, where to search and how to recover a target without damaging the environment. A good coin shooter can recover a lot of finds and leave the area looking as though he had never been there. Above all, always fill your holes when you have recovered the target. ...
- Page 6 LIMITED LIFETIME WARRANTY This warranty gives you specific legal rights, and you may have other rights which vary from state to state. This instrument is warranted to be free of defects in material and workmanship as long as it is owned by the original consumer purchaser. This warranty is not transferable, and is valid only if the warranty registration card has been completed and mailed within 10 days of purchase. During the first two years, TESORO will, at its option, repair or replace any instrument covered by this warranty, without charge, except for transportation charges, at its factory in Prescott, Arizona, or at one of its authorized repair centers. After two years from date of purchase, TESORO will replace defective parts at no charge except a nominal labor change and transportation charges. This warranty excludes batteries, damage caused by leaky batteries, cable breakage due to flexing on body mount units, and wear of the searchcoil housing. Also excluded are instruments which have been abused, altered, or repaired by an unauthorized party. If warrant service should be necessary, contact the factor for nearest repair center. Under the copyright laws this documentation may not be copied, photocopied, reproduced, translated or reduced to any electronic or machine readable form, in whole or in part, without the prior written consent of Tesoro Electronics Incorporated, except for the private use of a Mayan owner or operator, or in a manner otherwise described in this documentation. © 19951996 Tesoro Electronics Incorporated. All rights reserved. Printed in the United States. Home Tesoro Electronics, Inc. 715 White Spar Road Prescott, AZ, USA 86303 19287712646 ...
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