PimentoUK Posted August 31, 2023 Share Posted August 31, 2023 I can only speculate what is the purpose of these parts ( IC, resistor, capacitors ). Sometimes components are fitted to help calibration or testing of the detector, but they serve no actual function when the detector is used normally. ( The Fisher F2 has two resistors fitted between the demodulated X and R signals, with a test-point on the junction. These resistors could be removed with no effect on the operation. ) One thing you could try is removing all of the "unnecessary" parts from the PCB, and see if the machine then starts working. Do this carefully, as you may need to re-fit them again. Tip: resolder them on one terminal, that way you cannot lose them or mix them up . My hunch is the missing part could be an analogue switch, single-pole ( like part of a CD4066 ) or a single op-amp. [edited] Link to comment https://www.detectorprospector.com/topic/23877-help-teknetics-g2/page/2/#findComment-253136 Share on other sites More sharing options...
Arcoman Posted August 31, 2023 Author Share Posted August 31, 2023 wrote to the manufacturer. may answer. it is strange that no one should have such a device. Link to comment https://www.detectorprospector.com/topic/23877-help-teknetics-g2/page/2/#findComment-253138 Share on other sites More sharing options...
PimentoUK Posted August 31, 2023 Share Posted August 31, 2023 "It is strange that no one should have such a device." I an unsure what you mean. If you are surprised that no-one else replied with an answer, I should point out: * Your English is poor, many people will not understand your original question. * Your question is highly technical, about the electronic innards of a detector. People on here USE detectors, they don't build them, repair them, modify them electronically. You should register with the technical Geotech1 Forum, where you might get some response. *I am sure there are many people on here who own a G2 / F19 / Goldbug Pro / or a clone. But they are not going to dismantle their detector to answer your question, for a multitude of reasons. ------ Here is the Geotech1 Forum that I recommend joining: Geotech1 Link to comment https://www.detectorprospector.com/topic/23877-help-teknetics-g2/page/2/#findComment-253154 Share on other sites More sharing options...
Arcoman Posted August 31, 2023 Author Share Posted August 31, 2023 There's nothing complicated. 3 bolt. View what is written on U7. Everything is too easy. But thanks for the lead. Link to comment https://www.detectorprospector.com/topic/23877-help-teknetics-g2/page/2/#findComment-253159 Share on other sites More sharing options...
PimentoUK Posted August 31, 2023 Share Posted August 31, 2023 People are even less likely to open their machine now, as we have determined that very few machines actually have this part fitted on the PCB. Perhaps only very early models had these mystery components. Here is another good photo, located here on this forum: G2 PCB As you see, the parts are not fitted An F19 WITH the parts fitted, but hard to read: F19 with parts fitted Try and work out the pinout of the missing part. Is it connected to the same power supplies as parts U1 and U2, which I think may be op-amps ? Or is it connected to logic voltages, perhaps the same supply as the PIC microcontroller? Single analog switches normally have a standard pin configuration, for example see here: single switch SOT23-5 Likewise, op-amps also have a common pinout: single opamp 1 Link to comment https://www.detectorprospector.com/topic/23877-help-teknetics-g2/page/2/#findComment-253171 Share on other sites More sharing options...
Arcoman Posted August 31, 2023 Author Share Posted August 31, 2023 amazing photo. but the inscription is invisible. q2 are transistor pumps tx. I found a diagram on the Internet, from tx850. but there is also no u7. wrote wherever possible). Only you help. Thank you very much. Link to comment https://www.detectorprospector.com/topic/23877-help-teknetics-g2/page/2/#findComment-253208 Share on other sites More sharing options...
Arcoman Posted September 1, 2023 Author Share Posted September 1, 2023 I got an answer on Geotech1. Quote "This is a two-input NOR gate. Probably SN74AHC1G02." similar to the foto Link to comment https://www.detectorprospector.com/topic/23877-help-teknetics-g2/page/2/#findComment-253247 Share on other sites More sharing options...
Arcoman Posted September 1, 2023 Author Share Posted September 1, 2023 5 hours ago, Arcoman said: I got an answer on Geotech1. Quote "This is a two-input NOR gate. Probably SN74AHC1G02." similar to the foto.or is it SN74AHC1G86 Link to comment https://www.detectorprospector.com/topic/23877-help-teknetics-g2/page/2/#findComment-253257 Share on other sites More sharing options...
PimentoUK Posted September 1, 2023 Share Posted September 1, 2023 I saw the thread on the Geotech1 forum. Advice : Try not to argue with Carl, he knows what he is doing. So I think my earlier advice about removing the two / three capacitors and resistor may be a solution. If it does not work, re-fit them, and purchase the XOR gate IC. 1 Link to comment https://www.detectorprospector.com/topic/23877-help-teknetics-g2/page/2/#findComment-253260 Share on other sites More sharing options...
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