Findmall.com
 
 






Technology Forum


Welcome! Log In Register
Goldscan 5 damaged:sadwalk:
Posted by: draco
Date: July 15, 2013 01:34PM
Hi all, I just fail Goldscan May, somewhere in Europe where you can fix?.
When I turn, humbral goes crazy, suddenly sounding serious and increases the volume as if it were detecting a ferrous metal. It has been stored in a closet with the battery disconnected. No has pododo occur. Always well treated. Someone has this ever happened?

Sorry for my bad English, I use online translator.

Thank you.

Hola a todos, mi Goldscan 5 acaba de averiarse, alg



Used: Tesoro Euro Sabre, Minelab Excalibur, Goldscan 5.

Re: Goldscan 5 damaged:sadwalk:
Posted by: draco
Date: July 16, 2013 09:28AM
YouTube video of the problem. Thanks for looking.


video: http://youtu.be/Y3P7w9pIdqw



Used: Tesoro Euro Sabre, Minelab Excalibur, Goldscan 5.



Edited 1 time(s). Last edit at 07/16/2013 09:31AM by draco.

Re: Goldscan 5 damaged:sadwalk:N/T
Posted by: draco
Date: July 16, 2013 01:24PM

(This message does not contain any text.)



Used: Tesoro Euro Sabre, Minelab Excalibur, Goldscan 5.
Edited 1 time(s). Last edit at 07/16/2013 01:27PM by draco.

Re: Goldscan 5 damaged:sadwalk:
Posted by: Reg
Date: July 16, 2013 10:57PM
Hi Draco,

Has anyone tried to adjust any of the controls on the pc board? There is one that might cause this. You might try passing your ring very close to the coil and see if the audio does go back to the low threshold setting. If a stong signal works then the setting might be the problem or part of the problem. So, try a strong signal from your ring passing very close to the coil and see if things reset ok.

If the audio doesn't reset, then when a very strong response happens does the lingering audio remain much stronger? If it does, then it sort of points to a certain part of the circuitry.

What is happening is probably the result of one of the circuits not resetting. The logical one is the second filter which has a long time constant. There is an added capacitor than can be jumpered if it is the problem but a picture of the pc board will be needed to see if it is an add on or has been installed on the pc board on a later version. The area that has to be looked at is under the upper audio board.

Working on the GS 5 is difficult and taking the main board out is a challenge.

Good luck finding someone to work on your detector.

Reg

Re: Goldscan 5 damaged:sadwalk:
Posted by: draco
Date: July 17, 2013 07:50AM




Thanks for answering Reg. The Gs5 never been adjusted, or tampered with since I have it. That the previous owner was sent to Eric Foster, to update it, not any more ...

It's the first time I open it this way. I saw that in the small plate, there is like a loose bridge.

I tried what you mentioned, but still the same.

Thanks again

Gracias por contestar Reg. El Gs5 nunca ha sido ajustado, ni manipulado desde que yo lo tengo. Se que el anterior due



Used: Tesoro Euro Sabre, Minelab Excalibur, Goldscan 5.


Re: Goldscan 5 damaged:sadwalk:
Posted by: Reg
Date: July 17, 2013 09:56AM
Hi Draco,

When looking inside the detector box with the coil lead to the left you can see most of the layout of the lower board, but not all.

There are two pc boards, the larger lower one is the main lower pc board and sitting above the main board at the right end is the smaller audio board located above the larger one. The two white standoffs that look something like knobs, with one on each end hold the small board in place. Unscrew these two standoffs and carefully lift the small board and sort of fold it back so you can take pictures of the parts below it.

I need to see the lower board. The upper end of your present pics is the area of interest. I use a spring loaded clothes pin to hold the board back when taking pics. Other types of spring clamps can be used to hold the smaller board back as long as they are not so strong that they would break parts.

Below the audio board at the upper end you will see wheresome parts were added. I need a close up picture of those parts. So, you may have to move some wiring out of the way a little also. Look those parts over closely and see if one of the wires has come loose.

Let me know what you find. Also, take pics of the lower board below the upper one while concentrating on the upper end of the lower board.

Reg

Re: Goldscan 5 damaged:sadwalk:
Posted by: Reg
Date: July 17, 2013 10:48AM
Hi All GS 5 owners,

The pics posted by Draco show quite a few small blue pots located on both boards. Whatever you do, DO NOT ADJUST ANY OF THEM. There is no pot inside that will enhance the sensitivity or reduce noise. Instead, each pot has to be calibrated using special test equipment and special test procedures to properly align the detector. All of these pots have to be properly aligned for maximum depth.

Some adjustments require a scope to make the adjustment while others can be done with a high end digital voltmeter that allows accurate readings down to 1 mv. So, don't try to mark the pots and hope to get them back to the right position because it won't work.

Even the slightest wrong adjustment can and will result in loss of depth at best to the worst which is stopping the detector from working at all.

Reg

Re: Goldscan 5 damaged:sadwalk:
Posted by: Reg
Date: July 17, 2013 11:05AM
What I hope to see under the audio board is some added parts that have been added to the main board. Hopefully, one of those parts has come unsoldered and causing the problem. Also, if the parts are positioned correctly, a small jumper can be added to eliminate this addition as the possible problem.

Unfortunately, the GS 5 has had several modifications in its evolution and one of which included redesigning the pc board and installing these parts properly. So, depending upon the board itself, the parts can be either sitting on top of the board as an addition or installed because of a board change. If added on top, there is a slight possibility that one of the parts has come loose.

If there are parts on top, there will be three parts involved, a .47 uf cap, a 5.6 meg resistor and a FET. I am hoping the ground end of the resistor came loose and that is causing the audio to wander. If this is the case, then a simple solution would be to jumper the cap to eliminate the problem for good.

This special parts addition was installed to eliminate drift of the threshold. However the use of special parts that don't drift eliminated the need for this mod. Also, the main drift problem was determined to be primarily caused by something else. So, the removal of this addition will not cause any problems but might eliminate some.

Reg

Re: Goldscan 5 damaged:sadwalk:
Posted by: draco
Date: July 17, 2013 01:49PM



Thanks Reg, I hope I understand your question.



Used: Tesoro Euro Sabre, Minelab Excalibur, Goldscan 5.


Re: Goldscan 5 damaged:sadwalk:
Posted by: Reg
Date: July 17, 2013 02:41PM
Hi Draco,

I need a picture of the lower board but it has to be larger. Your pictures are too small for me to determine anything. Please make your pictures larger and give me three or so of the general area of the lower board.

Thanks,

Reg

Re: Goldscan 5 damaged:sadwalk:
Posted by: Reg
Date: July 17, 2013 02:47PM
Draco,

Also, turn off the ground balance and check to see if the signal still varies or acts normal with the GB off.

Reg

Re: Goldscan 5 damaged:sadwalk:
Posted by: draco
Date: July 17, 2013 04:11PM
Codigo THUMBNAIL HTML:
http://subefotos.com/ver/?5969a22ddd4d5920101f596bde678930o.jpg
http://subefotos.com/ver/?d063acf10471615f63292dfa5239d272o.jpg

Hi Reg, I hope you can see them well now. The forum not allowed to expand the images.
Click on the link and then click on the photo, will be much larger.

The problem persists in both straight Pi, as in ground balance.


Thanks for your patience.



Used: Tesoro Euro Sabre, Minelab Excalibur, Goldscan 5.



Edited 1 time(s). Last edit at 07/17/2013 04:13PM by draco.

Re: Goldscan 5 damaged:sadwalk:
Posted by: Reg
Date: July 17, 2013 04:47PM
Hi Draco,

Now, when you get time try using a high conductor object instead of your ring and see if a low tone causes the same signal wandering once the target is removed.

I don't see the additional circuitry that might cause the problem, so your unit must be a little older one, and the problem is somewhere else from what I was hoping.

Does turning back the gain control reduce the wandering signal?

What happens to the audio signal if you place an object near the coil? It should start strong if the object close to the coil, but then fairly quickly reduce in audio to the threshold level. Does it do this?

Finally, if you turn the unit on and just let it set, does the signal begin to wander or does it require you pass over a target before it starts?

Reg



Edited 2 time(s). Last edit at 07/17/2013 05:09PM by Reg.

Re: Goldscan 5 damaged:sadwalk:
Posted by: Reg
Date: July 17, 2013 05:15PM
Draco,

You flipped a toggle switch down on the side of the GS 5 in your video. What does that toggle switch do? I don't have a GS 5 now to look at and I couldn't read what it said above that toggle switch.

Thanks,

Reg



Edited 1 time(s). Last edit at 07/17/2013 05:15PM by Reg.

Re: Goldscan 5 damaged:sadwalk:
Posted by: draco
Date: July 17, 2013 05:43PM
Hi Reg, so does the problem when I turn it on and not any objective way. The video did so, you could see every possible way, both Pi so straight, as in ground balance.
When high objet spent a driver, does not return to normal background tone.

If I put an object near the coil, low audio signal humbral level, but with strong ups and downs, as heard in the video ..

I will make another video if you feel it necessary.

Ps: In the video, active ground lever balance

Tank you



Used: Tesoro Euro Sabre, Minelab Excalibur, Goldscan 5.

Sorry, only registered users may post in this forum.

Click here to login