Jeohunter - Visual Ground Scanner

[Funfinder]

Sir Funfinder, today i go to some old pales. in that pales one big underground area also present. on that underground i walk with jeohunter. battery is full, sensitivity is 80%, iron is ON, in this conditions my jeohunter shows cavity is 0%, Metal 5%, But iron is 85 to 95% in some places, in some places valuable is 90 to 98%. in both places metal % is only 5% to 8%. in graph also there is no rise points. it is cool and study going. what is this situation please give me idea.

Hello syed ayub basha

please can you translate "pales" with a different word?

The big question is:
Do you have heavy mineralized ground at this location?
Do you have analyzed the signal with the scan button?

Your described values are standing for iron objects.
But without proper ground balance or coil to ground
distance at heavy mineralized ground the detector could
have been moved outside of the "quiet reset zone range"
and then there is no metal at all.


Reduce sensitivity and use the scan anlayzing described in
the pdf manual at page # 30 ( printed page # 28 )

Getting an Analysis report by Analyzing the Target:

so you can go shure if it really is a deep metal object.


You can bury a metal object at some low mineralized area
and find out at which sensitivity you get the best for you
at the moment readable results. Or you can bury a metal
object directly at this pales area, perhaps there are piles.


Simply keep in mind:
Press the reset button outside of the detection area and scan
or detection results must be repeatable, clearly and identical.

[Funfinder]

Hi geo-i

The most important thing in such a complicated situation is
good information.

The real Jeohunter hardware-profis are located in Istanbul, Turkey.
Those have developed everything and know exactly the special
spots to locate the problem, to trace the circuit and where to
start. Those have the technical equipment for this task.

This is a 3 layer PCB (printed circuit board) with modern
devices on board - chips for the grafic and the computer
operating system even very experienced electronic-cracks
can't repair if a heavy or hidden damage was done.


If you are done with the final tests (variable resistor with
already removed chip) and again no result there's not
much to do, especially without the needed money.

You may order a working digital potentiometer chip
and perhaps your soldering-skills already are good enough
to attach it (is not a big problem, you could use little
connection-wires leading to the chip, too).

You cannot do any more damage, because the damage was
done already directly after the faulty accupack connection.

So you should try the final tests, you have nothing to lose.




btw. one of your older screen-pictures has shown that
perhaps the coil-detection circuit was damaged, too.


geo-i, this is no simple analog radio to repair, this is digital.
There are moving highspeed pulses from chip to chip
also known as data-transfers and a multimeter is not enough
to find out if everything works ok.


Back to the needed information:

have you mailed makro group and asked how much would
it cost to buy an used replacement board inclusive 2 accupacks?
If not, please ask so we have this information.

How much money could you spent for the Jeohunter repair?

What do you think would be the best solution?


Good luck and thank you, I'm shure the minus 20-25
degree celsius temperatures will be soon gone.

btw. here you can see a real fantastic shortcut:
nice fireworks with a car-battery:

http://upload.wikimedia.org/wikipedi...uss_12V20A.jpg

[syed ayub basha]

Today Hunt

Sir Funfinder, today i go to some old pales. in that pales one big underground area also present. on that underground i walk with jeohunter. battery is full, sensitivity is 80%, iron is ON, in this conditions my jeohunter shows cavity is 0%, Metal 5%, But iron is 85 to 95% in some places, in some places valuable is 90 to 98%. in both places metal % is only 5% to 8%. in graph also there is no rise points. it is cool and study going. what is this situation please give me idea.

[geo-i]

mission support

hello friend as you advice to send the machine to tukey I want to tell you
want thing sincerely I have not enough support of the budget because my
not success .thank please do understand me my situation bro.



regards

geo-i

[geo-i]

regrets

hello my friend until this moment I haven test anything yet because
I scared it might make thing come worse bro so I realy need your
advices as a specialist in this machine i do hope very sincerely
reply from you and I simpity about your weather trouble you. thanks



regards

geo-i

[Funfinder]

Hi geo-i

today also had some trouble - because of the arctic temperatures in Europe my water supply was frozen so first time in life I had to melt snow - really crazy! But I managed to repair everything. *phew*


geo-i, have you done now the variable resistor tests without this chip? Because the pictures shows that at least 1 of the isolated wires is missing!

Show me a picture where the circuit board is broken?

The circuit board is very stable and would not break if you remove a tiny chip.

Perhaps some of the contacts are "broken" - but not really.

"Seeing no burns" means nothing. Usually you cannot see anything if an IC or chip burns!

But we know it for shure this certain chip was heavily burned and I guess alot stuff, too.


So what do you wanna do now, if the final tests also won't work?

Perhaps you will find some online shop where you can buy such digital potentiometer chip of the same type but be warned:

This costs you money, alot of time and after all those tests I'm pretty shure some other chips - not findable ones - have been destroyed, too.


If you're shure that you can replace a working mainboard you should do what I told you (contacting Makro Detector) and perhaps you should order a vertical board too, because it could be this also got damaged

OR:

If you wanna have it the safe way you have to send your box to turkey.

(OR)

You may find someone who gives you some money for the broken Jeohunter so a new one costs you less or a different metal detector costs you nothing.

[geo-i]

result potentiometer digital chip

hello my friend funfinder I have got an answer about the digital
potentiometer digital chip auctual when I remove my digital chip
I saw the circuit board is broken and saw no burns is happen
at the digital chip do you have any opinion bro, how to save
the circuit board thanks .


regards

geo-i

[geo-i]

potentiometer chip

hello friend sorry about the questions digital
potentiometer chip the chip is old one
cleaned bro.


regards

geo-i

[geo-i]

thanks you

hello good friend thanks you very much for helping
me a lot I hope the last final test can turn back
the joehuntes detector back bro thanks .

[Funfinder]

Hi my friend, all our efforts seems to lead to nowhere.

If there is no more correct melody in the beginning,
no more usual beeps, no more picture on the display
something real serious has been damaged.

At your picture:
Is this a new digital potentiometer chip or is it the
old one cleaned?
If it's the burned one now you can carefully remove it
and test again.
Perhaps this chip causes some shortcut and if removed
this problem would be solved.

If we are lucky this is the last simple repair chance.

Please try this first, remove carefully this chip but
don't rip off the isolated wires while doing this.

After this the same test series:
potentiometer with 470 Ohm resistor in line
if this doesn't work with 220 Ohm and at least
without additional resistor.

Don't give up hope, it could work or it could not.


If this also should not work:

You may get an used Jeohunter mainboard at a really
very low price especially if you are the one who
incorporates it by himself into the Jeohunter.

You are already trained to do this without a high
risk of damaging something so it's no big problem.

I know Makro Detector has replacement boards
and perhaps you even could get one for free if
you would order one or two accu-packs that you
would need anyway!

No sending boxes around, no work for Makro-Group,
no long time to wait and really good working accus.

You even may pay the board directly if UPS or
some other delivering service brings the parcel
to your home.

Give makro detector a call or send a mail, tell 'em
honestly that your homebrew accu-pack destroyed the
mainboard and ask what it would cost if they would
send you an used mainboard - important:
for the old Jeohunter 3D model! - and with 1 or 2
(perhaps also used) accu-packs. I'm shure they
will be very accomodating and help you out.

You may pay 200-500 dollars but this is nothing
compared to a new Jeohunter or if you would have
to pay for very expensive repair costs. And then
you would have 1 or 2 great working accu-packs
and by the way: you really should order also an
original accu-charger (doesn't cost you much).

You have to see this mistake from it's positive
side and make the best out of that situation.

Sometimes repairing such stuff is possible,
sometimes not. Some have enough experience
to modchip their consoles, some destroy it.

At least you learned alot and it would be much
more frustrating if an electronical devices stops
working and you have done nothing -
like it's the case with DVD- and Laserwriter-stuff
and many others.

I know a person that only just stumbled a bit while
treasurehunting and ruined his 2000 dollar machine!
THIS is really frustrating, believe me, this is the hell!


So try this final test first (remove the burned digital
potentiometer IC) and if it still not working contact
makro detector directly @ Istanbul / Turkey and
I'm pretty shure very soon everything will be
OK again and perhaps better than before!

[geo-i]

blink screen

hello friend fun finder I do not test the variable before turning
the joehunters and I do not get any differennce bro while
truning the variable resistor just only blink screen and the
light lcd inside the box just do same blink to,not get any melody
while turning and I not change the 5 and 5ohm resistor just
change the same in the orginal like in the ciruit board 512 and 513
resistor get from the shop, the polarity of the double volt is 15.66v
before charges .ok my friend i hope you guide me and help thanks.


regards

geo-i

[Funfinder]

Hi geo-i

sorry to hear about the problems.

Have you tested before the variable resistor really works?

Do you can get any difference while turning the variable resistor?

OK, you may change the outside 470 Ohm by 220 (red-red-brown-gold)
Or do you already changed it to 5 and 50 Ohm without success?
The white screen is the background-light without any picture.

But this is a good sign that at least the screen now is stable.
And the power providing / dividing circuit is working.

Do you get the melody while turing the Jeohunter to ON?

Do you have connected the coil cable?!!! You must connect it.

Can you get some beeps after you are pressing the reset or accept button?


And before I forget:
Do you know what was the accu-pack mistake?
either it was wrong polarity or it was double voltage (29,6 V).


First try a basic test:
geo-i: Connect the coil, swich the Jeohunter to ON,
wait for a half minute and test if the detector will
detect metal before or after you have pressed the
reset button.

Because first comes the Ground Balance and here
the Jeohunter already is sensitive to metal and cavity.

IF YES, you are lucky and are able to search at least
without display.

You can set the needed values "blind" with my help
but first we need to know if the Jeohunter is still
able to detect metal at all.

I hope you have connected all the cables the right way.

If you have pictures of the 2 isolated 20cm wires
you can show them (from the soldering area).

[geo-i]

470ohm resistor

470ohm test resistor & white screen

[geo-i]

result test 470ohm resistors

hello my friend fufinder I have already finish the
470ohm resistors bro but nothing happen just only
repetitive click sound and white blink sound , bro
am I doing the the right thing because all the connection
you give is good is 51ohm resistors and 5.0hm resistors
should be change as well because I already change it
what is your opinion ? friend thanks.



regards

geo-i

[Funfinder]

see ya soon for the tests

cheers mate