C.Scope CS990XD

[TH Jim]

Hi Guys,

Just got a CS990XD and the depth performance seems poor. Asked C.Scope for a schematic for it and guess what - they declined. Saw another post a while ago on the forum from someone reqeusting the same schematic so I guess no one has one.

I'm determined to unravel the secrets of this machine, can anyone suggest any software that would help? I know I can take photos of the PCB and capture them but is there anything that will reverse this in to a schematic?

Cheers, James.

[Qiaozhi]

Hi Guys,

Just got a CS990XD and the depth performance seems poor. Asked C.Scope for a schematic for it and guess what - they declined. Saw another post a while ago on the forum from someone reqeusting the same schematic so I guess no one has one.

I'm determined to unravel the secrets of this machine, can anyone suggest any software that would help? I know I can take photos of the PCB and capture them but is there anything that will reverse this in to a schematic?

Cheers, James.

I'm not that surprised by your findings. Have a look at this review ->
http://www.metaldetectingbooks.co.uk...pe_cs990xd.htm

The CS990XD is a typical non-motion beginner's machine.

[ivconic]

Misunderstanding (or not knowing well) 990XD working principle can usually lead to conclusion that it is not good enough and not deep enough.
Wait a bit and give it a chance.
It is non motion machine - huge difference comparing to usual motion machines.
Working and handling with such machine is quite different.
Just be patient and give it a chance, before you form your final attitude upon it.
Retune button is most important command there.
Aside what was written in user manual; you should know that all the performances directly depends on correct use of Retune button.
When out, on real field, rise coil some 30cm over soil surface, adjust Tune and Level to hear treshold audio in speaker.
Than press Retune. If treshold do not disappear than readjust Tune a bit. Again press Retune.
Treshold should be barely audible. (It should stay like that most of the time)
Than lower coil to some 3-4cm over soil surface.
Treshold will change a bit. Readjust Tune fine to still have barely audible treshold tone in speaker.
When searching; try to keep same distance of coil from soil surface.
Frequently you will need to rise coil away from soil and press Retune, than lower coil to previous position and continue to search.
More frequent you do that - more better performances you will get from it. Point is to keep maintaining "edge" of best Sensitivity with this method.
Various soil compounds will cause occasional changes in Treshold , so you have to be trained and ready to retune it when needed.
Never retune 990XD with coil close to soil - you will "choke" it much and loose depths, for sure.
If you usually keep coil at 5cm over soil surface (when searching) than always rise it up least 5cm more to retune, and than lower it back again to previous position.
That's how you will achieve best sensitivity with such machines.
990Xd and similar Cscope nonmotions (440XD, 770Xd...etc..) are pretty good and usable machines, but need special knowledge and experience to be used with good results.
Air tests for such machines doesn't show a thing and are completely trivial and irrelevant. You will be amazed how good it can perform on real soil.
So forget air tests right now and go outdoor with it.
Enjoy, you have descent machine! Just need to learn it a bit!

[TH Jim]

Hi Ivconic,

Thank you for your excellent advice. I agree that the instruction manual leaves much to be desired! I have been retuning with the coil near the ground as I though it might need to ground cancel whilst tuning, but now I will try it using the method you suggested. I am using it mostly on the beach (dry pebbles and wet sand) so I hope it still works the same. I have grown to like the machine the more I have used it and have been suprised at finding some deep coins but the poor results of the air tests have unnerved me into thinking the machine might be a bit crap!

Thanks very much to you all for your input.

Regards, Jim.

[Qiaozhi]

Misunderstanding (or not knowing well) 990XD working principle can usually lead to conclusion that it is not good enough and not deep enough.

I forgot that you are a fan of these non-motion machines.
It's true they can achieve some good results, but the enjoyment is somewhat ruined by the constant need to press the reset button.

[ivconic]

I forgot that you are a fan of these non-motion machines.
It's true they can achieve some good results, but the enjoyment is somewhat ruined by the constant need to press the reset button.

True. Even now i have 770XD. I had once 1220B and sold it!?
What a mistake! At the time i thought it is obsolete and newer machines will give me more better results and joy... but i was so wrong!
Actually; the very best finds ever - i had with 1220B.
770XD is a modest small detector but still having the old Cscope "spirit".
990XD is better.
Once you get really "infected" with those nonmotions - it stays for a lifetime!
Frequent retuning is annoying only at the beginning.. maybe first few hours of searching. Later you simply get used on such behavior and fingers do the job automatically.
Not a problem at all.
Why are Cscope nonmotions so irresistible? Because they can really go very deep, they miss nothing and all the time operator is having complete and full control over signal from soil.
It is tough for the beginner to assimilate with such machine, but once it happen - it is really for a lifetime.
No matter what was written in advertisements - Cscope nonmotions are definitely NOT "for the beginners".
It is pity that those kind of a machines are not well presented and explained to todays prospectors and somehow those are pushed aside, because they still have much to offer, especially good old Cscope!

[asolone]

is a very good tool to research war, excellent ability to discriminate between metals, in northern Italy is widely used in battlefields ww1

[ivconic]

is a very good tool to research war, excellent ability to discriminate between metals, in northern Italy is widely used in battlefields ww1

Yes, here also! Cscope was the most wanted and owned detector in '80 and early '90, here in Serbia. Old glory! Along with White's.
Than came first 12xx Fisher's and Minelab's... and later all others too...
It's a pity that laws here are not settled good, so many owners just left those machines in cellars, lofts... in dusts.
Many nice legendary old glories just rot in dust somewhere.
I had idea similar to what Carl did - to contact those people and to buy all those devices, to make collection. But it is tough, many people still not using internet, many are still scared to talk freely about this stuff, laws are obsolete and backwards... tough to reach all those people yet...
And main problem is money and fame that generally follows metal detectors.
Once those machines were payed much - so people do not realize that prices went down in meantime!
That's why i like "western" mind and attitude; everything what's second hand - is much cheaper!
If only i could buy from ebay!
Here, there are still yoyos who will ask $2000-$3000 for such machine from early '80 !!!
Of course; those are never been sold!
Than were left in cellar or loft to rot...

[asolone]

I know very well c.scope 990xd-990b-1220b, I have repaired many, I use in my research on ww1 990xd with a change in ground and adjust the sensitivity, the change improves performance

[TH Jim]

Would you be able to give us the details of the changes you made to your 990XD?

Kind Regards

Jim.

[asolone]

as soon as possible I want to explain my edit

Devis from nord italy

[satdaveuk]

True. Even now i have 770XD. I had once 1220B and sold it!?
What a mistake! At the time i thought it is obsolete and newer machines will give me more better results and joy... but i was so wrong!
Actually; the very best finds ever - i had with 1220B.
770XD is a modest small detector but still having the old Cscope "spirit".
990XD is better.
Once you get really "infected" with those nonmotions - it stays for a lifetime!
Frequent retuning is annoying only at the beginning.. maybe first few hours of searching. Later you simply get used on such behavior and fingers do the job automatically.
Not a problem at all.
Why are Cscope nonmotions so irresistible? Because they can really go very deep, they miss nothing and all the time operator is having complete and full control over signal from soil.
It is tough for the beginner to assimilate with such machine, but once it happen - it is really for a lifetime.
No matter what was written in advertisements - Cscope nonmotions are definitely NOT "for the beginners".
It is pity that those kind of a machines are not well presented and explained to todays prospectors and somehow those are pushed aside, because they still have much to offer, especially good old Cscope!

I still have the 990d which works as well as the day it was made, and you are correct need to know how these machines tick, the only thing that let this model down was its cosmetic plastic look, but underneath all that a very powerful non motion machine.

[ivconic]

I still have the 990d which works as well as the day it was made, and you are correct need to know how these machines tick, the only thing that let this model down was its cosmetic plastic look, but underneath all that a very powerful non motion machine.

Sure it is! I agree!

[asolone]

[asolone]

Kappenabzeichen world war 1