Minelab metal/Gold detector modifications SD2000 SD2100 SD2100E SD2200 SD2200V2 GP Extreme GP3000 GP3500 GPX4000 GPX4500
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SD2100 Detector Modifications
The SD2000 mods have been a great success and we thought it was about time to try some moddifications to the SD2100 and SD2200 detectors.
A common trait between the circuit of the 2000 and 2100 is the receiver switching and the losses in this part of the circuit. We can upgrade the circuit to incorporate much newer components that will allow the detector to be more stable, go deeper and be more sensitive. We also have a modification to the filter circuits that make the detector give a much better signal on either shallow or deep Gold. We have 2 of these detectors being tested in the Western Australian Goldfields and feed back so far has been very promising with good Nuggets coming from old detected areas. I just hope the Gold prospectors send me a few Nuggets in appreciation..
A common trait between the circuit of the 2000 and 2100 is the receiver switching and the losses in this part of the circuit. We can upgrade the circuit to incorporate much newer components that will allow the detector to be more stable, go deeper and be more sensitive. We also have a modification to the filter circuits that make the detector give a much better signal on either shallow or deep Gold. We have 2 of these detectors being tested in the Western Australian Goldfields and feed back so far has been very promising with good Nuggets coming from old detected areas. I just hope the Gold prospectors send me a few Nuggets in appreciation..
This is a SD2100 had to be repaired. A common fault in these detectors when they will not operate is this component ZVN210. It is an easy fix and you can do it yourself. The part is worth about $2.00. In all cases of having to repair the SD2100 series 99% of the time it was this component that was at fault.
So you want to get rid of that horrid white paint that Minelab use on their circuit boards. Well the best stuff is an Aussie insect repellant that is called Aeroguard. Spray it on and go over every 10 or 20 minutes with a firm bristle brush. Keep it wet as the Aeroguard evaporates.
Here is another common fault that you will find on the SD2000 SD21000 and SD2200 Minelab detectors. All these detectors have a FET that is mounted to the case of the detector. These are supposed to have 3 legs but this one has 2 legs. What happens over time is that any vibration or shock causes the circuit board to flex and as the FET is connected to the board by the legs and the body is mounted to the case there are large forces that try to move the component. This detector had a fault that when it was turned on it started sounding like it was trying to send Morse Code. It sounded like random beeps from the headphones. I had to unsolder the FET to find that the Gate lead had become detached inside the FET. This made it hard to spot by looking at it while still connected to the circuit board. In this picture a new FET is installed and the old one sitting next to it. Any FET can be used to replace it as long as it has a rating of greater than 250 volts and 5 amps. The original part is an IRF840. This fault is quite common in detectors that get bounced around in the back of the car.
