Compass Coin Scanner Pro - replacement of the analog meter.

[Wolf]

Hello all. I recently acquired a metal detector Compass Coin Scanner Pro. Now it's time to start it. For starters I need to replace analog meter MD1140C because it is damaged. I read his symbol, but nowhere can I find information about it. Maybe someone knows its parameters? Thank you in advance for all your help.

[rickb]

Define "damaged". Put a voltmeter on a low dc range across the meter leads. Turn on the detector, adjust the controls while moving the coil over a target. Any indication? No? Does the needle move if you shake it side to side? If the needle moves hook a 500k to 1Mohm resistor in series with a 1.5 volt battery. After disconnecting the meter leads from the circuit board, momentarily connect the leads to the meter. + to red and - to black with just quick touch. does it deflect? Your turn.

Rick

[Wolf]

Thanks for the advice. The problem with the meter is that its spring is deformed. I hope that this is visible in the picture. It is not very susceptible to shaking.The needle is at rest on the scale at the point 30% starting from the left. After being energized according to the polarity of 80 mV - the needle takes the position of the maximum tilt. After disconnecting the voltage, the needle stops at 60% of the scale. After changing polarity and 60mV administration takes the position of 0%. Analogically after removing the power supply, the needle stops at the position of about 30%. I hope that my description is fairly understandable.




Is this element is manufactured to order for the company and is not commercially available? What is your advice?

[kt315]

what tells Keith Wills? http://compass-metal-detector-forum....des&user=37027

[rickb]

Measure the current at maximum deflection. Don't measure the resistance with an ohm meter because the current may ruin the coil. With a known current and voltage you can calculate the resistance. Just about any meter that fits and has the same current for full scale deflection will work.

Look for "panel meters on ebay with that current rating (50uA, 100uA, up to 1mA). There are a lot of cheap new Chinese made meters with those current ranges. To get it to fit your front panel, you will have to remove the movement from the plastic housing.

[kt315]

Mel wrote

Luki
Collectors want to buy cheap, then when they sell, they want to sell high. Me? I like to buy cheap too, and when I sell, I want to sell high as well. So I am not much different then you are. Am I a collector? I do not think I am a collector, but I am not sure. Do I like to own Compass metal detectors. Yes I do. I was a Compass dealer and I know the machines pretty well.

And you are in Italy, and you use lire (lira?), and Italian money the stores do not want to accept here in America. They want American money, and not bills higher in amounts of $20.00 face value, as higher bill values people like to print out and see if you will take it.

I am not into Paypal, despise that company. I do not want to do business with Paypal. I like getting paid in Ameican dollars, using either cash money or payment in U.S. Postal Money Orders. I take the money order to the post office, the man takes the money order to a phone, he calls somewhere, comes back and says it is FAKE, or says IT IS GOOD MONEY ORDER ,and then cashes it, gives me U.S. dollars for the money order, and then I say send it out to Luki in Italy.

So before I answer your question, can you send me GOLD COINS for my precious metal detectors? If not, no, I do not have anything to sell to you or anyone else. You see the picture? The picture is payment from Italy in a method that I can take to my bank, and sleep at night knowing I really was paid, or suddenly the bank calls me and says they are reversing the deposit, as the payment was a false payment... And I sent it out via post office, or UPS, or FEDX. I have lost money and have lost the metal detector!! Get the picture?

Here in America, I will sell, but I want to be paid in either American dollars or in U.S. Postal Money Orders. Can you do that? Why? Because then I know I have been really paid. I do not want cashier checks as they come from Europe and bounce in my house, bounce out the door, bounce down the street, I watch the payment bounce down the road, around the corner, and out of sight. The checks bounce just like a rubber ball. The payments are usually not worth the postage that was paid sending them to me.

So you see, I sell only in America, not to Europe, Asia, or to Africa. Reliable payment is the problem. Then shipping over the giant pond is another problem. Too much trouble and i know you know that as well. That is why I told you to look at websites in Europe, and Italy, Germany, England, France, and nearby countries.

There was three Compass detectors, on eBay, each was modified by Kieth Wills, depth mod. I saw your post, went to the auction. Nice units. Good stuff. If you divided the price of $825 by 3 detectors, that is an average of $275 a machine, so it was a bargain even if one has to find another detector stem outfit. Each one of those metal detectors was worth the $275 price. Did you buy it?

I used to be a Compass dealer, so I know all about Compass. I have the schematics, know the machines. I know about modifying them for depth. I have two oscilloscopes. I have all kinds of electronic equipment.

So you see, my problem ,and your problem? It is payment and shipping. Some on eBay will sell to you and ship to you. They are set up for doing that. I am not set up for selling and shipping to Italy. I do not want to sell and ship to Italy. Too much trouble for me. I do not need the money. I like and need the metal detectors. When I sit at the table, to eat my meal, at each chair, is a Compass metal detector. Each detector is smiling at me, as they love me as much as I love them. I say "You want some desert? More wine""

I can talk to you via email or posting, but beyond that, I am not set up for what you want to do. So if you have questions, I can answer the questions. Yes, I have lots of Compass, Teknetics, and Bounty Hunter metal detectors. Do I want to sell them? Who will sit at my dinner table smiling at me? Nope. I do not have anything to sell to you.

Have a nice day. And find a bunch of Compass metal detectors, in Italy, down the street from your house, and for only two lira a detector!!!
Melbeta

[kt315]

Luki
I do not discuss what Keith Wills does as what he does with his depth modification, as it belongs to Keith Wills, not to me. It is the way that Keith makes a living, as it is his job, and he gets paid for the depth modification. Yes, I know what he does, but I do not disclose it.

Now I can tell you, when Keith does his depth modification, he puts an gold decal, with black text, on the bottom of the detector, But you cannot see the decal, unless you slide the case off of the metal holder. So slide the case toward you, and on the metal slide part, will be Keiths decal. If it is not there, you do not have the Keith Wills depth modification.

If you open up the detector unit, since you do not know what Keith does, there would be no way you can tell if he put a depth modification inside it. But usings U.S. coins, I can tell you a test, that would tell you if the depth mod is on your detector or not. But it probably would not work unless you had U.S. coins. The U.S. Coin would be the copper penny, dated earlier then 1982. Here below is what Keith said in regard to his depth modification:

Quote:
"For many years now I have been doing a mod on the Compass Scanner help you get more depth in the ground and yet keep the units stability. worked out very well for many of you, but there is something I should explain. When Compass factory was still in business, I started doing mods on the vari-filter units. Not long after, Compass created the two units with tone ID like the Coin Scanner Pro. The first production or not have the mod I was doing in those two filtered units, then the factory changed and installed my mod in the rest of the production.

So if your two filtered unit in most cases it has already been modified for better. Best way i can tell you to test this is to use a copper penny, set the disc and the power level on preset and if you are getting 8 inches or more on the penny, then the mod is done to your unit. If you are only getting 6 inches it has not yet been done. This is done as an air test only.

You use the same test if you purchased a varifilter unit as well to see if the has already been done to it.

On most that we do the mod to, the unit factory is showing 6 inches on power level preset and 8 inches on max power level. When the mod has been done--most units will show 8 inches or more on preset and 11 inches or more on max and still stable. Only units I have found that this is not true is some of the units after the factory closed. It seems many of those units vary greatly and calibration can be difficult or none responsive. Those units can be recognized by their deals -- it will have no red color in the decals.

Mod is $50.00 plus shipping but we clean controls and boards, touch up calibration, and field test before we ship it back to you. If we find other problems or parts needed the cost of repair does go up, but we call first if it is going to exceed $100.00. Hope this helps, Keith

Gold Scanner Pro have not received it yet but in the pictures the decal side has scanner in red and a outline around the decal in red. Does that you can do the mod to it or you can not? And can you calibrate it?
Jim

Yes I can do the mod for you, but first check the unit using a copper as I said in my post and see if it has already been here and I have already the modification to that unit. We have done many Compass mods over years and many times we get units wanting the mod and has already We just tweek the unit some and send it back after a good cleaning and test. Keith"
Un-Quote:

...and Luki, there you go, the two ways you can know if Keith has modified you Gold Scanner Pro detector. One is the gold label, the second is to test it with the U.S. Copper Penny, and the penny has to be dated before 1982.
Melbeta

[kt315]

or

buy https://www.ebay.com/itm/Mini-MF-110...IAAOSwBahVe78Z

take out the meter and use. THATS NOT EXPENSIVE WAY BELIEVE ME.

[Melbeta]

Wolf
The two postings that KT315 posted were when I responded to a fellow named Luki, who was located in Italy. Those postings were not relative to your problem. I believe KT315 posted the material I posted previously as he thought it contained pertinent information relative to your particular problem. If not, I understand. Some guys have replaced them with meters from Whites Electronics. But I have no suggestions in that matter.

You might have an electrostatic discharge affixed to your meter, by someone touching the detector meter and it froze the meter needle. Some guys use clothes dryer static sheets, or a TV De-gauser unit. Sometimes it frees the frozen needles.

Those meters were ordered by Compass Electronics, and are no longer available for purchase. The only way one can find a replacement meter, is to contact Keith Wills (If you are in the USA) and see if he has a meter for sale. If not, you can buy non-working Compass Scanner units and salvage the meters and replace.
Melbeta

[kt315]

a schematic clear shows 1mA meter. (milli-ampere)

[Wolf]

To sum up: due to the fact that the meters were manufactured for a special order, I can only use substitute with similar parameters. The use of an element from the multimeter as advised kt315 will not work, because its size is much smaller and would make it difficult to observe the indications. I found several gauges more dimensionally similar. As for the scope, in fact the schema shows 1mA. As soon as the parcel arrives and I install the part - I will share my experience with you.
Thanks to colleagues for help.

[qute1]

https://www.ebay.co.uk/itm/Analogue-...QAAOSwZb5bPJCG

[kt315]

https://www.ebay.co.uk/itm/Analogue-...QAAOSwZb5bPJCG

https://www.youtube.com/watch?v=yis-GjW2oIA

[qute1]

Lmco