Problem with Mineoro FG80

[Geo]

Thanks Hung for your replay.
It will take long time to repair the FG80 because i must make new receiver because the old is full of epoxy glue. But i"ll try to measure the transistors from bottom side of pcb.
About PDC210 i believe that for good modification you must replace the uc with analog stage and to play a little with front-end.

Regards

[hung]

Problem most likely is in the ionic chamber. Maybe it was shorted out.
Years ago my partner, now deceased, had a similar behavior in his PDC210. When over an area of gold mining, he saw a strange looking rocky formation, when he pointed the device, the same thing you described happened. Sending the device back to repair, the ionic chamber was ruined. Later the rocky formation was found to be radioactive or something. If that was the case, probably radon gas was pressurized between their crystals.
Also remember what I have told here years ago. Several 2 boxes including a Mineoro 08MI had burned transistors in the location where a historical treasure is believed to exist.

Recently I could figure the code of PDC210's chip and also have to mods to it with a lot of enhancements. One great device has become even better yet.
Keep me informed of your case. I would like to know the cause of the problem when you find out.
Rgds.

[Geo]

One photo from the modified Fg80

[Geo]

Before about a year i modified a Mineoro FG80. During this time the owner has found 2 times buried items. The last time was two weeks ago where he found approximately 500 silver coins at a depth of about 50 cm. The coins found by a distance of 30 ... 35 meters. This is not new to me because I know other examples of finding buried coins. The strange thing is that when FG80 close as one meter from the target start making a permanent beep and did not stop even after he pulled out and reinserting the battery. After a quick check i found problems between antenna and detection.
I wonder how big trend it detected in order to burn the transistor ???.
Eventually the phenomenon we call many times, maybe is it only an electrostatic field ???

Regards