Whites Coinmaster V coil

[WesP]

I picked up a Coinmaster V off ebay which of course doesn't work. The coil is a "4BDX". It has four pins which measure : Pin 1 to pin 2 = 134.7 ohms, Pin 3 to pin 4 = 5.8 ohms. Do those numbers sound correct? Since I can't find a schematic for it is it a lost cause or is it possible to repair it? If I can't how can I determine what milliamps the meter is?

Wes P

[amtech2005]

Whites Coinmaster V coil

WesP , Do not throw anything in the Trash !! The coil might be O.K. , I will search for the "4BDX" coil specs. Have you powered up the unit ? Are you getting any meter movement or speaker noise ? I think with just a little work , you will have a decent mid-range detector , just a little heavy , I wonder if that model had the optional shoulder strap ? Anyway , check the battery connectors and search coil connector on the case . Look for corrosion . If no luck , take it apart , check where voltages are present or where they are not . If you bought it at a good price , It is worth fixing and will be a fun project .................Eugene

[digger barns]

Potted Module

I think that coinmaster V may have had a potted module inside. There is a circuit diagram in the patent.

[amtech2005]

Whites Coinmaster V coil

Hello , From reading another separate thread he posted . I am pretty sure he has a short somewhere close to the circuit that connects to the analog panel meter . When he takes it apart , maybe he will post a nice photo of the circuit board , and we will see if there is a black epoxy module or not ??............Eugene

[WesP]

CoinMaster V5

I have found that the main switch was broken and replaced it with the a comparable switch but still no luck. The battery check positions are working but no sound from speaker at all. Seems to have voltage at diffrent spots on on the board but I have no idea where to check or how much it should be. I don't seem to be getting any wave forms at all on my Oscope from anywhere on the board or the coil plug. The board does have a potted module covered with white plastic. The board also has two traces that have been cut, but they look like something that was done at the factory. I'm attatching pictures of everything. I also bought a Coinmaster 4/D off eBay for parts or to fix as well as a CoinMaster 4000/D series 2 that is suppose to be in working condition. Any suggestions on where to look on the CM5 would be appreciated. The arrow on the switch is where I believe there was another sliding contact. The center of the switch was rounded out and was not turning.

WesP

[amtech2005]

Whites Coinmaster V coil

Hello WesP , Great !! You posted the circuit board !!! Disconect your battery !! On the photo I see 3 bad cold solder joints on one of your Potentiometer's ??? The 3 terminals must be re-soldered. Use a solder wick first to remove all the old bad solder. Check all the solder joints and re-solder where necessary !!! Then re-apply power. If still not working , then check all your transistors . Replace the bad ones . If still not working , Check all your capacitors , especially the electrolytics because they go bad due to old age , Leakage , etc....etc...like me..........Check the I.C chip with your scope since you have one...........Yup , You will be outside Diggin your neighbors yard , in no time ....I am going to try to find the Schematic tonight , because it should have the normal operating voltages measured at the factory , like test points across the circuit board . You should have this repaired in no time , also check , "all the rotary switches" for good contact...After this project we will get your 4000/D series 2 running !!!........Take care.......Eugene

[amtech2005]

Whites Coinmaster V coil

Patents do not always have a complete schematic . Just a reference Schematic , showing symbols and reference numbers. I believe this schematic was before Coinmaster V was produced . There is not an I.C chip anywhere on this schematic that I can see !!! I am still searching for some kind of Coinmaster V schematic . Lets do this , how much is your battery supply voltage suppose to be , and your voltage readings on your circuit board , and also you can hook up an ammeter to see your total current . If you have super high current then look for the possible components that are shorted , look for parts , resistors fried or a chemical smell . Your total normal current should be 50 to 100 milliamps max. Not 1 to 2 amps !!! Let me know where you are at , on this..............Eugene

[amtech2005]

Whites Coinmaster V coil

WesP , How are things Going on the Whites Project ?? If you want , you can e-mail me at [email protected] . Have a Great Week-end...........Eugene

[WesP]

Coinmasters

Well I received the Coinmaster 4000 and the Coinmaster GEB4D I purchased on eBay. The 4D was suppose to be for parts but when I opened it up I found a broken wire. I resoldered it and it works great so it won't be used for parts. It has the same coil as the CM V and they both measure out the same so I know my other coil is OK. It is a really heavy machine. I can't imagine swinging it for very long. It doesn't seem to have a very good balance either. The coil weighs a ton. The main board is almost exactly the same as the CM V. The daughter board is the exact same board. Main difference is that the potted section on the CM V isn't potted on the CM 4D. I'm attaching pictures of the CM 4D mainboard and unpotted section.

The CM4000 is in very good condition and apppears to work great. Much lighter (eight less batteries and a lighter coil plus a smaller case) to swing. It will be interesting comparing the two in the field.

[amtech2005]

Whites Coinmaster V coil

Great photos , and you know that little circuit board with a transistor looking IC and its 6 leads , that might be the "secret epoxy coated module" in later Whites models ???!!!!!....See if the number of outer pins and size are identical with the coinmaster V module , and maybe make a little hand written schematic..........You are making progress and will fix all 3 , that is great !!!!!......Thanks for posting again !!! Take Care............Eugene

[Max]

Great photos , and you know that little circuit board with a transistor looking IC and its 6 leads , that might be the "secret epoxy coated module" in later Whites models ???!!!!!....See if the number of outer pins and size are identical with the coinmaster V module , and maybe make a little hand written schematic..........You are making progress and will fix all 3 , that is great !!!!!......Thanks for posting again !!! Take Care............Eugene

Like a couple of transistors glued there with epoxy ??? matched pair!
Or need same temperature there ?

[amtech2005]

Whites Coinmaster V coil

WesP , just checking back to see your progress with the Vintage Whites machines you bought . I rememember you fixed 1 out of 3 , pretty fast !!! How are the other 2 ?? ..............Eugene

[WesP]

Coinmasters

I have tow of the three I purchased working. The 4000 model just needed a new speaker installed. The fine wires to the coil speaker coil had corroded and broken off. I had to install a new battery holder and wiring because of the green crud that forms on battery wiring making it impossible to soldier. The detector works well. I have found a few dollars worth of coins at the local school in three trips. The discrimination setting works well but isn't fool proof. A large piece of foil will set it off even at full disc. setting. It's not the most comfortable detector to use but it's not nearly as heavy as the 4D model.

The 4D just needed a wire re-soldered and new battery holders installed. It works well and actually seems to be able to go a bit deeper then the 4000. But it is so heavy ti wears you out really fast.

The Coinmaster V Supreme isn't working and I don't have any clue where to looking for the cause without a schematic. But it's a much older model the the other two so I'm not in any hurry to get it going. Too many other projects to try and get working.

Thanks for your interest.

[Melbeta]

It is a 1976 model I believe......

I have tow of the three I purchased working. The 4000 model just needed a new speaker installed. The fine wires to the coil speaker coil had corroded and broken off. I had to install a new battery holder and wiring because of the green crud that forms on battery wiring making it impossible to soldier. The detector works well. I have found a few dollars worth of coins at the local school in three trips. The discrimination setting works well but isn't fool proof. A large piece of foil will set it off even at full disc. setting. It's not the most comfortable detector to use but it's not nearly as heavy as the 4D model.

The 4D just needed a wire re-soldered and new battery holders installed. It works well and actually seems to be able to go a bit deeper then the 4000. But it is so heavy ti wears you out really fast.

The Coinmaster V Supreme isn't working and I don't have any clue where to looking for the cause without a schematic. But it's a much older model the the other two so I'm not in any hurry to get it going. Too many other projects to try and get working.

Thanks for your interest.

That machine was made back around 1976, Rocky LeGaye made his evaluation on the detector and published it in 1977 and in 1978. A machine that old, most likely the electrolytic capacitors have leaked out the grease, and need to be replaced. So begin replacing the electrocaps one by one, starting from the power supply entrance, and you should be able to nail the bad part. And you might use tuner cleaner on any switches and tuner switches.

[jeff]

hello everyone iam new on your forum and have already found lots of info i needed bout coinmaster v. great stuff, jetro