Goldscan help needed please

[Littlejim]

Hello everyone! I had the good fortune to find this Goldscan (IV ? ) at a local auction. I've been looking for one for a while but I didn't get a chance to run it through before purchase. It appears to be DOA ( unless I'm doing something really daft ) Does anyone have a suggestion for someone in the UK who can take a look at it for me or offer some advice?
Many thanks
Jim

 

[fredm]

The goldscan is/was made by Eric Foster there in your country...and is the moderator of this forum; surely you are close to the source of all your answers.

good luck

fred

 

[Littlejim]

Thanks for the thought Fred - I think I was rather hoping Mr Foster might read the posting and make a suggestion but I guess he's a busy chap.
Best regards
Jim

 

[Reg]

Hi Jim,

Eric retired a couple of years ago so I don't know how often he looks at the forum. Hopefully, he will.

In the mean time, maybe a few checks will help. First, is the battery good and if so, do you get an indication on the tiny meter on the back box? If the battery checks ok, then when you turn the detector on, do you hear a high pitch squeal? Usually, one can hear the high pitch squeal. However, regardless, take a small hand held am radio turn it on and place it near the coil. Make sure the small switch on the front of the front control panel is selected to the main coil. Double check the probe for a signal also. Do you get a high pitch squeal on the radio? You might have to turn through the am channel to get this to happen. This will check to see if the detector is transmitting something through the coil or the probe.

Let us know if any part of the detector appears to work.

Reg

 

[Littlejim]

Thanks for the input Reg. I tried the detector with an AM radio and it didn't produce a squeak on either the search head or probe settings. The battery has power so I'm not entirely sure where to go from here. Any ideas?
Best regards
Jim

 

[Reg]

Jim,

Did the tiny battery on the back box indicate a voltage when you turned it on? If it did, then something is not functioning correctly. One of the logical things is the battery was replaced and the polarity was wrong. If this happens, then the regulator in the back box may have failed.

I am guessing that the model you have has all the IC's in sockets, so if it is one of the main IC's that has failed, then it is a matter of simply pulling one out and replacing it. However, the regulator isn't one of those type of parts.

Do you have a digital voltmeter and know how to use it? If so, I can give you some points to measure but will do so via email.

Reg

 

[vespaman]

try here

http://www.pentechnic.co.uk/index.php?_a=viewDoc&docId=5

dont know if he can help but worth a try

 

[behzad]

hi Reg i have the same problem can you help me and give me some points to measure? thanks
email: mamrez72@yahoo.com.au

 

[Reg]

behzad,

I sent you an email.

For all interested, the schematic for the Goldscan 4 is on the Geotech1 forum. Also, there has been many discussions about this detector including some mods.

This particular Goldscan model has a low conductor select switch on it. Actually, there are two setings called SEL1 or SEL2, Either of these two modes will detect low conductors while ignoring high conductors of which much of the iron normally found such as nails becomes when the ground balance is properly set. Unfortunately, very little was ever stated about this feature and people often thought the detector was defective because it could completely ignore high conductors including large gold.

One of the mods I came up with was to add a switch that would allow the operator to select to ignore low conductors or high conductors similar to that found on the TDI.

Reg