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Offline MrBchrovkaTopic starter
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« on: May 24, 2017, 04:19:42 pm »
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Hi!
Have somebody achematic from MD-3006 machine?
I bought one and work not well, sometimes beeps endless.

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Offline GoldDigger1950
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« Reply #1 on: May 24, 2017, 04:22:11 pm »
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You should have tried it before you bought it. Try fresh batteries. Then look at the wires going to the box from the coil.

Next time don't try and save a few dollars. Buy a new machine.

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It's all about that moment when metal that hasn't seen the light of day for generations frees itself from the soil and presents itself to me.
Let's Talk Treasure!

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« Reply #2 on: May 24, 2017, 06:16:07 pm »
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 Do you have the Owner manual ?

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Offline MrBchrovkaTopic starter
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« Reply #3 on: May 25, 2017, 02:07:25 am »
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Yes it had new batteries, i know the handling for this type of machines. The problem is: heavy instabil. I can in vlf mode with the ground adjust make in balance. After when it sense a metall go crazy. Must a new balance adjust make. The search oscillator is stabil, i have with oscilloscope the measurement made. By return path from coil i see nothing but clean signal. It stand absolute no balance. The same thing in tr1 or tr2 mode. Somewhere the problem between the phase comparator and other stage. Without schematic can be heavy as hell.
I have experience with the IB type of MD metal detectors , but in these type of machines the balance is came from the coil structure.

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« Reply #4 on: May 25, 2017, 07:17:39 am »
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   That machine is just one of many variants of the good ol Microtanna Aka Radio Shack Aka Many Names.  

DaJa Vu

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Best I can come up with from my collection is the 3003 Monron.  Should be lots of commonalities.





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« Last Edit: May 25, 2017, 07:21:00 am by homefire »
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Offline MrBchrovkaTopic starter
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« Reply #5 on: May 25, 2017, 11:42:33 am »
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thanks!
It could be the same elctronic , but pcb layout can other be. My instrument panel looks different , but the functions are the same.
Let's hunt fault , next metal Grin Grin Grin Grin Grin

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Offline MrBchrovkaTopic starter
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« Reply #6 on: May 26, 2017, 04:36:12 pm »
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I have the coil opened.This is an engineering shit!!! A centimeter from schielding is never made!!! And 10 centimeter wire lie open!!!

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« Reply #7 on: May 26, 2017, 05:09:15 pm »
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  You need to leave a Gap in the Shielding like that or it forms a Transformer and would Draw Power from Tx and Rx Signal.  
 
That is what is called a 4B type Coil.  Outside is Tx coil and Small coil Rx.    Have a read of this document and you will understand more.

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« Last Edit: May 26, 2017, 05:12:40 pm by homefire »
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« Reply #8 on: May 26, 2017, 06:07:17 pm »
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Built the 4B back in the 80s on a detector that is still going! The rec coil was if I remember using 28 or 30 ga magnet wire! The shielding was a heavy commercial foil. After i got it settled down on a disk of micarta, gave it the ole gobs of epoxy everywhere treatment.


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« Reply #9 on: May 26, 2017, 08:12:18 pm »
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Dang Mud.  That coil made me think of Cream Pie ! Huh?

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