Minelab GPX-4000 Quick Start Manual
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Minelab GPX-4000 Quick Start Manual

Metal detector
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Quick Start

Set the front panel switches to the following positions:
Search
Search
Soil /
Soil /
Ground
Ground
Mode
Mode
Timings
Timings
Balance
Balance
Patch
Patch
Sensitive
Sensitive
Fixed
Fixed
G
G
N
N
Deep
Salt
Tracking
Press the On/Off button on the rear control panel.
Turn the Threshold control up until a tone is audible
through the headphones.
(pg. 34)
Raise the coil off the ground and Press the Auto Tune
button to reduce electrical interference. The tuning
process takes approximately 60 seconds. Do not move the
coil or pass metal objects near the coil during the tuning
process.
(pg. 33)
Whilst lowering and raising the coil between 25mm and
100mm (1" and 4") from the ground, change the Ground
Balance switch to Tracking. Any variations in the Threshold
will smooth out within 3-5 seconds.
Adjust the Threshold to a very faint but still audible level.
It should be smooth with only minor fluctuations.
You are now ready to start searching!
On/Off
Hold for
FP
Coil /
Coil /
Rx
Rx
Double D
Double D
M
Threshold
Cancel
(pg. 25)
Auto Tune
Ground
Balance
Fixed
Tracking
(pg. 40)
(pg. 34)
Threshold

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Summary of Contents for Minelab GPX-4000

  • Page 1: Quick Start

    Quick Start Set the front panel switches to the following positions: On/Off Hold for Search Search Soil / Soil / Ground Ground Coil / Coil / Mode Mode Timings Timings Balance Balance Patch Patch Sensitive Sensitive Fixed Fixed Double D Double D Threshold Deep...
  • Page 2 Minelab Electronics Pty Ltd Minelab dealer, or write to us: This document contains proprietary From our origins in 1985, Minelab have specialised in advanced electronics information which is protected by technologies. Our competitive advantage was created almost immediately with copyright. Apart from any use as permitted...
  • Page 3 Voltage Technology (DVT), and the latest in high-tech analogue components combined with advanced digital processing. The GPX-4000 will locate gold in all types of terrain, especially highly mineralised ground conditions, with greater efficiency than any previous detector. This manual is designed to help both the beginner and expert prospector get the best performance out of the GPX-4000.

  • Page 4: Table Of Contents

    Settings Accessing Functions Quick Start Back Cover Accessing Settings Function Setting Introducing the GPX-4000 Select List of Parts Volume Limit / Setting the Max Volume of all Sounds On/Off Hold for Assembly Audio Tone / Adjusting the Pitch of the Threshold...

  • Page 5: Introducing The Gpx-4000

    Deep slow careful detecting. As you become familiar Ground Balance Type – In addition to Ground with all the new functions of the GPX-4000, you can Balance there is now the choice of two Ground then program your own settings for each Search Balance Types, Normal and Specific.

  • Page 6: List Of Parts

    List of Parts...

  • Page 7: Assembly

    Assembly Attaching the Coil to the Lower Shaft: Attaching the Lower Shaft to the Upper Shaft: 1 Plug the two rubber washers into the holes on 1 Rotate the twistlock of the upper shaft counter- either side of the lower shaft. clockwise to ensure that it is loosened.
  • Page 8 Assembly Always ensure that the control box is turned off before connecting or disconnecting the coil Attaching the Armrest Strap to the Armrest: to avoid damage to the detector's electronics. 1 Press both strap studs onto the armrest studs. 2 Push the armrest straps through the slots in the armrest cover and then push the cover over the Connecting the Coil Cable: armrest.
  • Page 9 Assembly Attaching the Waistbelt to the Battery Harness: 1 Place the belt on a flat surface with the studs facing up. Ensure that all the studs are unclipped. 2 Place the harness on top of the belt, with the battery pouch facing up. Press the belt studs over the harness strap to hold the belt in place.
  • Page 10 Assembly Attaching the Bungy Cord: 1 Create a loop in the bungy cord. 2 Undo the plastic wing-nut and remove the bolt from the clamp. 3 Push the bolt back through the clamp and loop to secure the bungy cord to the shaft. 4 Fasten the screw with the wing-nut.

  • Page 11: Adjusting The Detector For

    Adjusting the Detector for Comfortable Detecting For comfortable, long term Holding the Detector: Adjusting the Battery Harness: detecting, it is important Thread your arm through the armrest and strap. A comfortable fitting of the battery harness will that you take the time Grasp the handle of the detector and rest your ensure the longest detecting session possible, to adjust the detector...

  • Page 12: Charging The Battery

    Make sure your vehicle battery is in good condition as an accessory. If travelling will require a shorter period of time to recharge. and charged before using it to charge the GPX-4000 into remote areas, a spare There is no need to fully discharge the Li-Ion battery battery.

  • Page 13: Battery Led Patterns

    Do not incinerate the battery. Disconnect the battery and wait for it to cool below 40°C in a cool place before Return the battery to a Minelab authorised service centre for repair. reconnecting. The use of non-approved components will VOID YOUR WARRANTY.

  • Page 14: Detecting Basics

    Detecting Basics Detector Sounds The GPX-4000 is a ‘motion’ The GPX-4000 will perform at its best when the coil Targets Threshold (Background sound) detector. This means it is kept close and parallel to the ground at all times. Buried metal objects are...

  • Page 15: Front Control Panel

    Smart Point is a connection point audio produced by the detector. This for the Quick-Trak button, located on control increases / decreases the level the handle. Minelab also uses this as a of the Threshold. (pg. 34) test port to ensure that your detector...

  • Page 16: Turning The Detector On

    Turning the Detector On LCD Menu Structure The On / Off button is located Many of the GPX-4000 Functions Settings on the back control panel. functions are accessed through the LCD Menu. These are explained in To turn the detector on or off: further detail throughout Press and release On / Off.

  • Page 17: Search Mode

    Mode when the detector is of sensitivity, depth and signal response under a turned off. variety of conditions. Until you are comfortable with the different functions and settings of the GPX-4000, Main Menu General Mode should be used. functions are the same for each Search Mode.

  • Page 18: Factory Presets

    Factory Presets The GPX-4000 is provided with a Factory Preset Main Menu: Range: Factory Preset: selection of menu settings, suitable for first-time Volume Limit 1 to 40 users. Audio Tone 1 to 100 Until you become more familiar with the...

  • Page 19: Tune / Reducing Electrical Interference

    Tune Auto Tune Reducing Electrical Interference The detector may become noisy due to electrical Tuning should be done To Perform an Automatic Tune: interference from powerlines, radio transmitters initially with the Coil 1 Hold the detector at waist height and the coil electrical equipment or other detectors operating switch in Double-D vertical and slowly rotate through a half-circle,...

  • Page 20: Threshold

    Threshold Adjusting the Background Audio Level Threshold is the constant audible background audio When the Threshold is tone or 'hum' produced by the detector. too high, a faint signal is masked, and only the peak The level of the Threshold should be set low, but still of the loud signal is audible audible and stable.
  • Page 21 Soil/Timings Optimising the Detector for Different Soil and Target Types Soil / The Soil/Timings switch has the ability to change Normal (N) Timings the electronic 'timing' or pattern of the pulses. This Normal gives you the best performance on a wide optimises the detector for different soil conditions, range of soil conditions and will provide the best the type of coil being used and desired target sizes.

  • Page 22: Ground Balance Reducing Ground Noise

    Tracking Where possible, always search in Fixed position to The GPX-4000 has the ability to cancel out the maximise depth and sensitivity, and only use Tracking effects of ground mineralisation automatically, and in areas with excessive ground noise and/or rapidly the Tracking function will maintain a perfect Ground changing mineralisation.

  • Page 23: Ground Balance Procedure For Tracking

    Ground Balance Procedure for Tracking (For Ground Balance Type – General) 1 Find a clear area of ground without any targets. Ground Balance re-set in Tracking 2 Change the Ground Balance switch to Fixed. Whilst sweeping the coil, you can test if you are still Fixed in harmony with the ground by stopping, and raising 3 Whilst keeping the coil parallel to the ground, lower...

  • Page 24: Ground Balance Procedure For Fixed

    Ground Balance Procedure for Fixed (For Ground Balance Type – General) 1 Find a clear area of ground without any targets. It is very important when Ground Balance re-set in Fixed searching with a Fixed 2 Change the Ground Balance switch to Fixed. Whilst sweeping the coil, test if you are still in Fixed Ground Balance, that the...
  • Page 25 Sensitive. detecting conditions and targets. Use of Monoloop will often increase the sensitivity Coils not specifically designed for the GPX-4000 Minelab Monoloop coils of the detector but may also be a little more may behave erratically or be ineffective in either can be used on the unstable in heavily mineralised ground.

  • Page 26: Functions

    Functions Settings The Function Select control scrolls Once a function has been selected, through a list of functions. the Setting control accesses a settings adjustment screen. Title Navigation Arrows Navigation Arrows indicates what type indicate which way indicate which way of function you are the menu can scroll the setting can be...

  • Page 27: Accessing Functions

    Accessing Functions Accessing Settings Function Setting Setting Function Setting Setting Function Function Setting Function Setting Setting Select Select Select Select Select Turn the Function Select Turn the Function Select With a function highlighted, To return to the list of functions, control right to scroll down control left to scroll up the turn the Setting control to the...

  • Page 28: Volume Limit / Setting The Max Volume Of All Sounds

    Volume Limit Setting the Maximum Volume of all Sounds Range 1 to 40 Factory Preset Volume Limit is the maximum level of sound emitted Maximum Volume Limit: by the detector when a target is detected. Faint and loud signals are unaffected.

  • Page 29: Audio Tone / Adjusting The Pitch Of The Threshold

    Large, deep targets produce a different response to small shallow targets. It is important that you adjust A target signal on the GPX-4000 is normally a two- the Tone to suit the type of target you are searching tone signal. A target signal that first falls in pitch and for.

  • Page 30: Tracking Speed / Keeping Up With Changing Ground

    Fixed, then Tracking Speed allows you to gradually option, however Minelab recommends new users to increase from Slow Tracking Speed, into Medium first become familiar with the GPX-4000 using the Tracking Speed, then into Fast Tracking Speed, as Factory Preset Smooth setting.

  • Page 31: Ground Balance Type

    Ground Balance must be done with the Ground 90% of goldfield soils and uses the conventional Balance switch – not the Quick-Track button. automatic Tracking on the previous Minelab model, the GP3500. In Tracking, General Ground Balance 1 Find a clear area of ground...

  • Page 32: Iron Reject Off (All Metal) / Accepting All Target Types

    Discrimination is dependent on target signals being Ground Balance to Fixed that valuable targets will not be missed. strong enough for the GPX-4000 to determine if the for this and keep the sweep target is ferrous or non-ferrous. If the signal is weak,...

  • Page 33: Iron Reject Rejecting Iron Targets

    Iron Reject Rejecting Iron Targets Range Off (All Metal), 1 to 30 Factory Preset Off (All Metal) There is usually some merging of characteristics Iron Reject will give the A low level of Iron Reject requires a stronger ferrous between targets that are clearly ferrous and others best results when used signal before discrimination occurs.
  • Page 34 Battery Test Manual Tune Viewing the Battery Voltage Reducing Electrical Interference (Auto Tune, pg. 33) Range 0 to 255 The Battery Volts screen allows you to view the Manual Tune allows you to select a particular current voltage of the battery. This screen can be channel, or you may want to fine tune the detector viewed at any time.

  • Page 35: Gain / Adjusting The Sensitivity Of The Detector

    Factory Preset Patch 7 General 8 Deep 9 The Audio Type function replaces the Boost switch The Gain function allows the GPX-4000 to be on the previous GP Series detectors. There are four optimised for differing conditions, controlling the options to choose from. Each setting changes the...

  • Page 36: Motion Adjusting Sweep Speed

    Motion Adjusting Sweep Speed Range Very Slow, Slow, Medium, Fast Factory Preset Patch Med General Slow Deep V. Slow The speed at which you sweep the coil has an Medium effect on target response time and Ground Balance Is ideal for general detecting when normal 'slow & adjustment.

  • Page 37: Response / Inverting The Pitch Of The Target Signal

    Response Inverting the Pitch of the Target Signal Range Normal, Inverted Factory Preset Patch Normal General Normal Deep Inverted The Response function allows you to invert the normal pitch combination of target signals to different size targets. If a person is used to hearing a rising and then falling tone sequence on small targets, and then goes to deep ground searching big nuggets, the target signal response can be inverted so that the larger...

  • Page 38: Pinpointing Locating The Target

    Pinpointing Locating the Target To find an object and reduce the size of the When a target is detected, sweep the general area hole required to remove it from the ground, it is with the coil, taking note of where the strongest necessary to pinpoint the exact location of the signal is received.

  • Page 39: Recovering The Target

    Recovering the Target It is essential to carry at least one of the following Clear the area of loose surface material and check digging tools with you when searching: that the target signal is still there. If it is not, the target should be amongst the moved surface - a small, strong digging spade or shovel material.

  • Page 40: Detecting Tips

    For Maximum Gold Dig all target signals, even in previously detected variance. one direction and no signal on the return sweep. areas. The GPX-4000 has superior ground Recovery balancing and depth so it is possible to find • If you are not sure if the sound is ground noise...

  • Page 41: Commander Coils

    Commander Coils The GPX-4000 is supplied In addition to this there are also a number of 18" Round Double-D with the 11" Double-D coil. other size coils now available to give improved A serious coil for the serious operator. The This coil has an excellent performance to your detector.

  • Page 42: Choosing The Right Coil For The Job

    15” x 12" Monoloop coils will work A Monoloop coil will often have improved Semi-Elliptical on the GPX-4000. However, performance over a Double-D coil but can be more Double-D there are limitations which difficult to Ground Balance and therefore possibly means that some functions more noisy.

  • Page 43: User Preferences

    User Preferences Troubleshooting Main Menu: Range: User Preferences: No sound • Check that the detector is on (battery, power cable, connections and LCD) Volume Limit 1 to 40 • Turn the Threshold control fully clockwise Audio Tone 1 to 100 •...

  • Page 44: Glossary Of Terms

    Pinpointing uses the design of the mineralised ground, good depth and mineralisation. The GPX-4000 has Mineralisation search coil windings to determine the sensitivity and a very thorough search 'automatic Ground Balance'.

  • Page 45: Taking Care Of Your Detector

    Shading will help protect it. Do not leave the detector in a closed vehicle, especially in the sun. Do not open the control box as this will void your warranty. All control box, battery and coil repairs should be sent back to Minelab or a Minelab authorised repairer.

  • Page 46: Technical Specifications

    Technical Specifications Warranty Detector The GPX-4000 control box has a 2 year warranty covering parts and labour. Transmission Bi-Level Pulse Induction Technology MPS Dual Voltage Technology The GP series / Commander coils have a warranty for one year against malfunction.

  • Page 47: Service Repair Form

    Service Repair Form Today’s Date Detector / Model Serial Number Purchased From Purchase Date Faulty Part(s) Owner’s Name Address Telephone ( ) Day Home Fax ( Email Description of Fault Please explain how we can replicate the problem in order to fix your detector.

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