ulhund GC-1071 User manual

Metal Detector
Owner’s Manual
Customer Service Email: [email protected]
Model：GC-1071

CONTENTS
English 1-13
...........................

Use 9-volt
ALKALINE batteries.
Do not use
“Heavy Duty” batteries.
Do not use
ordinary “Zinc Carbon” batteries.
Thanks for choosing our GC-1071 metal detector. With this metal detector, you can
hunt for coins, relics, jewelry, gold, and silver just about anywhere. The detector
comes with high sensitivity and strong ability of discrimination.
FEATURES:
LCD Display: Shows the probable type of metal, the depth of the target, range of
DISC, NOTCH, the level of SENS, VOLUME and battery condition. It also has
digital display for target ID.
Three Tone Audio Discrimination: Sounds three distinctive tones (high, medium
and low) for different types of metal.
Five Controls:
--POWER: Turns on or off the power.
--MENU: Press it to select desired operation mode and the setting of SENS and
VOLUME.
--INCREASE (+): Increase the level of sensitivity or volume and the range of DISC
(discrimination) or NOTCH.
--DECREASE (-): Decrease the level of sensitivity or volume and the range of
discrimination or NOTCH.
--PP: Pinpoints the location of the target accurately.
Headphone Jack: lLets you connect headphones of 3.5mm and operate without
trouble.
240mm Waterproof Search coil: Lets you use the detector even if you must put it
under shallow water.
Adjustable Shaft: Lets you adjust the length of shaft for comfortable use.
Power: The detector requires two 9-volt alkaline batteries (not incl.).
Backlight: For better use in dark areas.
1

ASSEMBLING THE DETECTOR
Assembling your detector is easy and requires no special tools. Just follow these
steps:
1.Unscrew the fixing knob on the search coil and remove the knob connector. Place
the washers into the groove of the lower stem. Then insert the stem and align the
holes on the search coil bracket and the stem. Push the connector through the
holes and tighten the knob.
2

INSTALLING THE BATTERIES
1.Turn off the power before installing the batteries.
2.Slide the battery cover off in the direction of the arrow.
3.Place two 9V alkaline batteries into the battery compartment matching the
polarity symbols (+ and -) marked inside.
Caution:
● Do not over-tighten the search coil or use tools such as pliers to tighten it.
● The search coil’s plug fits into the connector only in one way. Do not force the
plug and do not pull on the cable or you could damage it.
2.Press the silver button in the lower stem, and slide the stem into the middle stem.
3.Press the silver button in the middle stem, and slide the stem into the S stem.
Tighten the lock nut on the S stem.
4.Press the silver button in the top stem, and slide the top stem into the S stem.
5.Adjust the stem to a length that you feel comfortable when you stand upright with
the detector in your hand, and the search coil is level with the ground with your
arm relaxed at your side. Then counter-clockwise rotate to tighten the lock nut on
the middle stem.
6.Fix the control box on the S stem and tighten the fixing screw properly. Wind the
search coil cable around the stem. Insert the search coil’s cable plug into the
five-pin jack at the back of the control box.
3

Note: The detector will maintain full performance until the batteries need to be
replaced. Replace batteries when there is no segment remaining on battery level
indicator. Alkaline batteries should be used.
1.It is recommended to choose the headphones with volume control.
2.Insert the headphones’ 3.5mm plug into the headphone jack at the bottom of the
control box. At this time the internal speaker disconnects.
Warning:
● Dispose of old batteries properly. Never bury or burn them.
Cautions:
● Use only fresh alkaline batteries of required size.
● Do not mix the old and new batteries or different types of batteries.
● If you don’t plan to use the detector for a week or more time, remove the batter
ies. Batteries can leak chemicals that can destroy electronic parts.
USING HEADPHONES
LAYOUT OF THE CONTROL PANEL
4

--POWER: Press the button to power on the detector. Press it again to power off
the detector.
--MENU: Press MENU to make it active and to select desired operation mode, the
setting of SENS or VOLUME.
LCD DISPLAY
CONTROL BUTTONS
5

MENU
There are two modes (DISC & NOTCH) to be selected from the MENU indicator.
For example, if you want to select DISC or NOTCH mode, press MENU several
times until DISC or NOTCH is displayed on the MENU indicator. When DISC or
NOTCH appears on LCD, you can set the desired target range for operation. If you
want to adjust the level of sensitivity or volume, press MENU until SENS or
VOLUME appears on LCD. Then press “+” or “-” to set the desired level.
--INCREASE (+): Increase the level of sensitivity or volume and the range of DISC
(discrimination) or NOTCH.
--DECREASE (-): Decrease the level of sensitivity or volume and the range of
discrimination or NOTCH.
--PP: Press and hold for precision target pinpoint at any time.
Search coil motion is not required; a motionless search coil over a metal target
will induce sound.
SENS (Sensitivity)
Adjust the sensitivity from 1 to 10. The higher the number, the more sensitive the
detector. This sensitivity control does not affect Pinpoint sensitivity.
Note:
Cell phones, cell phone towers, etc… all produce interference signals and will
cause the detector to beep when no metal is present, and sometimes to beep
erratically.
VOLUME
Adjust the volume level from 0 to 10.
If the detector beeps erratically or beeps when there are no metal objects being
detected, reduce the sensitivity.
The Menu is located on the left side of the screen. During normal operation the
Menu is inactive and faded. Press the MENU button to cycle through the Menu.
Each press of the Menu button moves to the next Menu item.
The option selected is marked by “ ●”. Once a menu option is selected, the setting
can be changed using “+” and “-”. Here is a description of the Menu options:
6

DISC (Discrimination)
Discrimination is an important feature of professional metal detectors. It allows user
to ignore trash and undesirable objects.
Notice that the 4 right-most categories cannot be eliminated.
Right-most categories represent silver or other high-value targets, which are
generally desirable; therefore the detector does not allow them to be discriminated
out.
To pick up the eliminated target category, press “-” and categories will be accepted
back for detection from right to left.
NOTCH
The NOTCH control is similar to Discrimination. It allows you to accept or reject
different types of metals. While DISC works left to right, the NOTCH control allows
you to accept or reject individual categories.
Categories eligible for NOTCH are FOIL, 5¢, ALUM, Zn.
Press “+” or “-” to program the NOTCH feature. Each press of “+” or “-” cycles to a
new category and that category icon will flash for 3 seconds. Then the category will
reverse status. Alternatively, press MENU while the icon is flashing to accept the
Notch. If the icon had previously been illuminated it will now disappear indicating
that the category has been eliminated from detection. Likewise, an icon that is not
visible on the display will re-illuminate, indicating that category is now notched in
(i.e. detected).
Any of the 4 eligible categories can be “Notched” in or out.
The DISC controls the detector's Discrimination function. In its default setting all
metals are detected. Use this DISC control in order to eliminate unwanted types of
metals from detection. Targets are eliminated from detection from left to right.
Each time you press “+” button, a target category icon will disappear. When an icon
disappears, that category is eliminated from detection.
7

TESTIGN AND USING THE DETECTOR
1. Supplies Needed:
a Nail (made of iron) a U.S. Quarter (or silver coin)
a U.S. Nickel a Gold Ring
a U.S. Dime a U.S. Penny made of Zinc(dated after 1982)
2. Position the Detector:
a. Place the detector on a table with the search coil hanging over the edge. Or
better, hold the detector with the search coil off the ground.
b. Keep the search coil away from walls,
floors and metal objects.
c. Remove watches, rings and jewelry.
d. Turn off lights or appliances whose
electromagnetic emissions may cause
interference.
e. Pivot the search coil back.
f. Press POWER to power on.
3. Using DISC (Discrimination) Feature:
a. Pass all objects over the search coil and notice the different tones.
Nail: low tone
Nickel: medium tone
Zinc Penny: medium tone
Gold Ring: most gold rings will register with a medium tone
Dime: high tone
Quarter: high tone
b. Press MENU until DISC is displayed on LCD.
c. Press “+” once. The iron indicator on the display will flash and then disappear.
d. Wave the nail. It will not be detected because it has been “discriminated out.”
8

4. Using NOTCH Feature:
a. Press MENU until NOTCH is displayed on LCD.
b. Press “+” twice. The 5 cent icon will flash for 3 seconds and then disappear. That
means 5 cent is “notch out” (eliminated). The detector will have no response to
5cent. To eliminate “ZN”, press “+” four times. The “Zn” icon will flash and then
disappear.
c. Wave a 5 cent coin or Zinc Penny over the search coil. They will not be detected
because they have been “notched out”(eliminated). Notice the target categories
not displayed on LCD can not be detected.
For fast proceeding, press MENU while the icon is flashing to accept the Notch.
To pick up the target eliminated, press “+” or “-” to have the target icon flash and
then press MENU.
5. Using PINPOINT Feature:
a. Press and hold PP. “PP” momentarily appears on the LCD.
b. Hold a coin motionless over the search coil.
c. Lower coin toward search coil and then raise coin away from search coil.
d. Notice that the sound changes as the coin moves closer and farther.
e. Notice that the depth indicator changes as the coin moves up and down.
6. Adjusting SENS(SENSITIVITY)
a.Press MENU until SENS is displayed on LCD.
b.Press “+” or “-” to set the desired level. Sensitivity level can be set from 1-10. The
relative digital value will be displayed on LCD when “+” or “-” is pressed.
7. Adjusting VOLUME
a.Press MENU until VOLUME is displayed on LCD.
b.Press “+” or “-” to set the desired level. VOLUME level can be set from 0-10. The
relative digital value will be displayed on LCD when “+” or “-” is pressed.
OVERLOAD WARNING
If a metal object or highly magnetic soil are too close to the search coil, the
detector will overload and “- - ” will appear on LCD. The detector will make a rapid,
repeating mid-tone warning sound. Overload will not harm the detector, but the
detector will not function under these conditions. If overload occurs, raise the
search coil to detect the target from a greater distance, or move to a different
location.
9

TARGET INDICATIONS
OUTDOOR DETECTING
Note: There is a wide variety of metals and no target can be identified for certain
until unearthed. This table is for general reference only.
1.Find a place outside where there is no metal.
2.Place a sample you want to find on the ground.
3.Press POWER to power on the detector.
4.Hold the search coil level to the ground about 1~2 inches above the surface,
slowly move the search coil over the area where you placed the sample, sweep
-ing the search coil in a side-to-side motion.
● Never sweep the search coil as if it were a pendulum. Raising the search coil
while sweeping or at the end of a sweep will cause false readings.
● Sweep slowly, hurrying will cause you to miss targets.
● It’s better you sweep the search coil from side to side in an arc line of 3 inches
motion and keep the search coil parallel with the ground
If the detector detects the item, it sounds a tone, and an arrow above the target
icon appears. Also LCD displays the digital value of target as well as the depth.
If the detector does not detect the item, make sure that the mode is set correctly for
the type of metal you’re searching for. Also make sure that you’re moving the
search coil correctly.
10
Metal
range
Target
Tone
ID
Display
Digital
value
IRON
Iron Foil 5¢ ALUM ZN 10¢ 25¢ 50¢ 1$
Low Medium Medium Medium Medium High High High High
1-19 20-29 30-39 40-49 50-59 60-69 70-79 80-89 90-99
GOLD RANGE SILVER RANGE

DETECTING WITH PINPOINT
Notes:
● The detector responds with a signal when it detects most valuable metal objects.
If a signal does not repeat after you sweep the search coil over the target a few
times, the target is probably junk metal.
● False signals can be caused by trashy ground, electrical interference, or large
irregular piece of junk metal.
● False signals are usually broken or non-repeatable.
After you find a target, you can use PP(Pinpoint) to find the exact location of the
target as follows:
1.Press and hold PP to activate the Pinpoint feature.
2.Position the search coil just barely off the ground, and to the side of the target.
3.Move the search coil slowly across the target, and you can locate it by the
sound. The target is located directly under where the sound is loudest.
Narrow it Down:
1.To narrow the response further, position the center of the search coil near the
center of response pattern, but not directly over the center.
2.Release PP.
3.Immediately press and hold PP again.
4.Repeat this narrowing procedure to narrow the field of detection further.
Troubleshooting Guide
11
Problem Reason Suggestion
The detector
displays or sounds
without detecting
any target
1.The detector may
receive interference
and false signal from
broadcast antenna and
other electronic lines
2.The humidity of
environment may be
extremely high
1.Change searching
place
2.Wait for some time to
check again

12
The detector
sounds false
signals.
1.Sensitivity set too high/
environmental electro
magnetic interference
2.Sweeping the detec
tor’s search coil too fast
or at wrong angle
3.Using 2 detectors in
close proximity
1.Reduce sensitivity
2.Sweep the search coil
more slowly and hold
the detector correctly
3.Keep two detectors at
least 6 meters(20’)
apart
The detector does
not detect anything
LCD display
multiple target
categories or emits
several sounds at
once
1.Sensitivity set too low
2.Target range is elimi
nated
3.Search coil is not
parallel to the ground
1.Increase sensitivity
2.Recover all target
range
3.Adjust the search coil
angel to be parallel to
the ground
1.There may be over one
+kind of metal targets
2.The detector can’t
identify the target.
Sometimes, oxidized
metal also causes the
excursion of target
arrow and tone.
1.Reduce the sensitivity
to eliminate the detec
tion of the deeper
target
2.Sweep the search coil
with different angles
No power, no
sound
1.Five-pin cable not
connected well
2.Dead battery
1.Re-plug it properly
2.Replace batteries

13
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Facturer: Shanghai 21 st Century Electronic
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20000 Shanghai, China
Company: Like Sun GmbH
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Mail: [email protected]
Phone: [phone]
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