Tinker & Rasor 7-T Instruction sheet

Web: www.tinker-rasor.com E-mail: [e-mail]
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PRODUCT INSTRUCTIONS
DETECTRON MODEL 7-T VALVE & BOX LOCATOR
You are now the proud owner of a Detectron Valve & Box Locator. This is the most
stable, dependable instrument of its type on the world market today. Your Detectron
Valve & Box Locator has many features built into it for ruggedness, but always
remember that it is a precision electronic instrument. With proper care you can expect
many years of complete satisfactory performance from your Detectron Valve & Box
Locator.
Quality parts, plus expert craftsmanship, insure that you, the owner, have made an
excellent choice in purchasing a Detectron instrument.
UNPACKING
If damage has occurred in shipment, file a claim with the carrier immediately. If it is
necessary to contact your supplier or manufacturer concerning damaged or missing
items, be sure to include all information such as serial number, purchase order number
and invoice number. This will assure you of obtaining proper and expeditious service.
PRELIMINARY
Loosen the adjusting collar on the telescoping stem, and extend the stem until it is long
enough so that, when the Detector is held in a comfortable position, the search head is
as close as possible to the ground. Tightening the adjusting collar will lock the stem in
the desired position.
Please note that the inner portion of the telescoping stem is free to rotate through 1/4 of
a turn. This permits the head to be turned sideways for compact storage, but prevents it
from twisting far enough to damage the wiring inside the stem. No attempt should be
made to twist the stem past the point where it stops.
TUNING
IMPORTANT! Read carefully and follow instructions precisely!
This Detectron Valve & Box Locator, must be tuned at the same level at which it is
operated. If change in the operating level is necessary, the instrument must be “Re-
Tuned” at the higher or lower operating level. The correct operating position is when the
detection head is in the exact same plane as the surface over which it is being used.
For maximum results, keep the detection head very close to the surface under
investigation.
For proper “TUNING” follow the steps listed below in sequence:
DIVISION OF TINKER & RASOR
2828 FM 758, NEW BRAUNFELS, TX 78130 TEL: [phone]
www.detectron.com

Web: www.tinker-rasor.com E-mail: [e-mail]
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PRODUCT INSTRUCTIONS
1. Turn instrument on.
2. Hold the instrument in the operating position, keeping in mind that the detection head
should be close to the ground surface and maintained in this position throughout the
tuning and operating of the Detector.
3. Turn the tuning knob (located below the meter) to the left until it stops, be careful not
to force it.
4. Now turn the tuning knob to the right until you find a point where there is no tone
coming from the loudspeaker and the meter reads “ZERO”.
5. Continue turning the knob slowly to the right until the tone reappears and the meter
needle responds.
6. Now carefully turn the tuning knob to the left very slowly until the tone just
disappears and the meter reads “ZERO”.
7. To check for proper tuning and maximum sensitivity, raise the instrument a few
inches from the position in which you carried out Steps 1 through 6. If the tone
sounds when the instrument is raised, it was properly tuned at the lower level and it
can be assumed that maximum sensitivity has been obtained.
OPERATING PROCEDURES
After completing the proper tuning your instrument is ready to use. The instrument is
designed to afford the operator ease of handling at a comfortable walking position
passing the detector head from side to side in front of the operator allows a rather wide
area to be covered on a single pass. Provided the instrument is properly tuned, it will
indicate metallic objects when the detecting head is passed directly over them. To
pinpoint such an object, simply approach it from several directions and investigate in the
center of the area over which you obtained the signal indications.
It is suggested that preliminary operation of the Detector be carried out over known
metal objects of various sizes. This will help you to become familiar with the operation of
the instrument and will greatly increase your ability to find objects whose locations are
unknown. Trial operation will also increase your ability to tune the instrument to its
maximum sensitivity, which is important when attempting to locate smaller metallic
objects.
SPECIAL OPERATING PROCEDURES
There are many variations to the operation of your Valve & Box Locator, but basically
they are alike. For instance, should you desire to operate your instrument over ground
DIVISION OF TINKER & RASOR
www.detectron.com
2828 FM 758, NEW BRAUNFELS, TX 78130 TEL: [phone]

Web: www.tinker-rasor.com E-mail: [e-mail]
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PRODUCT INSTRUCTIONS
area that is highly mineralized, simply tune your Detector to be less sensitive. This can
be accomplished by following Step 6 of the “TUNING” procedure, except turn the
adjusting knob slightly further to the left.
For locating small iron objects, such as nails in a wall, we suggest you tune the
instrument opposite from the tuning procedure as outlined under “TUNING“ procedures.
For reverse tuning, turn the tuning knob exactly opposite; that is where it states “turn to
the left”, turn to the right, etc..
The Detectron Valve & Box Locator is extremely easy to operate and after a brief
practice, you will be capable of obtaining excellent results.
DETECTION HEAD
The detection head is waterproof and can be submerged in fresh water up to the
adjusting collar on the telescoping stem. Care should be taken to keep the rest of the
instrument dry, as the detection head is the only portion of the instrument that has been
waterproofed.
BATTERIES
The batteries can be tested by sliding the power switch to “Battery Test”. The batteries
should be replaced when the meter needle falls within the “Replace Battery” area. Since
old batteries often give a high reading for a minute or so, the instrument should be
turned on for about two minutes for accurate battery testing.
To replace the batteries, remove the four screws (two on each side) in the instrument
housing, remove the top half and replace the three size “AA” batteries in the bottom half.
Be sure batteries are replaced in the correct position. With the + battery terminal
nearest the end of the battery holder marked +. For best results use batteries rated for
transistor radio service, such as M15R, 1015, VS-334 or equivalent.
Batteries should always removed when the instrument is to be stored for a long period of
time.
Always check to be sure the power switch has been turned off when the instrument is
not in use.
EARPHONE
Plugging the earphone into he jacked marked “Phone” will automatically disconnect the
built-in loudspeaker.
DIVISION OF TINKER & RASOR
www.detectron.com
2828 FM 758, NEW BRAUNFELS, TX 78130 TEL: [phone]

Web: www.tinker-rasor.com E-mail: [e-mail]
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PRODUCT INSTRUCTIONS
Minor Trouble Shooting
Characteristics Defect
1. Wide null, 3 or more turns of adjusting A. Weak batteries
knob. B. Set out of adjustment
(See Alignment Procedure)
2. No “NULL” A. Weak batteries
B. Set out of adjustment
(See Alignment Procedure)
3. Poor signal response over known metal A. Weak batteries
object. B. Improperly tuned
(See Tuning Procedures)
4. No signal A. Weak batteries
B. Broken battery leads
C. “Open” circuitry
D. Faulty earphone
ALIGNMENT PROCEDURE
Indication of need of alignment would be the inability to obtain a null with the tuning
control. (New batteries should be tried first, since weak batteries may have the same
effect). NOTE: Alignment should normally be done at the factory, and improper field
alignment will void the warranty.
Extend the telescoping stem to its normal operating g length, and tilt the detection head
to its normal operating position. Remove the four screws (two on each side) in the
instrument housing and lift off the top half. Support the Detector in a position where the
detection head will be clear of all metal objects.
1. Turn unit on
2. Turn the tuning knob to the left until it begins to tighten (do not force), and then turn it
back to the right exactly one-half turn.
3. With a small screwdriver, turn the screw on the trimmer capacitor on the printed
circuit board to the right until it tightens (do not force).
4. Now turn the screw on the trimmer to the left until the tone from the loudspeaker
disappears. Continue turning very slowly to the left until the tone just reappears.
The unit will now be properly aligned.
DIVISION OF TINKER & RASOR
www.detectron.com
2828 FM 758, NEW BRAUNFELS, TX 78130 TEL: [phone]

Web: www.tinker-rasor.com E-mail: [e-mail]
–5 –
PRODUCT INSTRUCTIONS
WARRANTY
Your Detectron Valve & Box Locator is warranted under normal use and service against
defect in workmanship and material for a period of ONE YEAR from the date of its sale
to the original purchaser. We agree to repair without charge to the original purchaser,
any part or parts that in our judgment are defective, providing the complete instrument is
returned to us, transportation charges “PREPAID”.
It is given expressly in lieu of all other warranties, expressed or implied and no
representative or other person is authorized to make any warranty, or to commit this
company to any liability not strictly in accordance with the standard factory warranty.
Careless or improper usage voids this warranty. Unless, in our opinion, the detector is
definitely defective in material or workmanship, a nominal charge will be made for
repairs.
To validate the warranty, the warranty card must be signed at the time of purchase and
mailed promptly to
Tinker & Rasor
2828 FM 758
New Braunfels, TX 78130
FACTORY REPAIRS
Detectron offers 24-hour service on factory repairs. Should it be necessary to return
your instrument to the factory for repairs, be sure to send the complete instrument and
all components. May we also suggest sending a brief note describing your problem.
This could expedite repair thus saving you money on unnecessary labor charges. Care
should be taken in packaging to insure against damage in transit.
Detectors returned to factory for repairs should be sent transportation prepaid to:
D.E. Stearns, Division of Tinker & Rasor
ATTN: Repairs
2828 FM 758
New Braunfels, TX 78130
For proper and expeditious repair service, advise factory of return shipping information.
In most cases the Detector can be repaired and returned the same day it is received at
factory.
When ordering parts or requesting further information give the serial number of Detector
for which parts or information is required.
009-248
DIVISION OF TINKER & RASOR
www.detectron.com
2828 FM 758, NEW BRAUNFELS, TX 78130 TEL: [phone]