Help Needed May need to build search head

[3pinplug]

Hi All
Just been informed by Cscope that the Search head on my CS4ZX is "beyond practical repair, parts no longer available"??? Going to ring them tomorrow and see if a CS1220XD search head that I have laying around can be used as a parts donor but if not I'm a bit stuck. The machine runs a 12khz so anyone know if worst case scenario could I build or modify a search head to fit? Its a good machine so keen to get it up and running.
Thanks
Mark

[Qiaozhi]

Hi All
Just been informed by Cscope that the Search head on my CS4ZX is "beyond practical repair, parts no longer available"??? Going to ring them tomorrow and see if a CS1220XD search head that I have laying around can be used as a parts donor but if not I'm a bit stuck. The machine runs a 12khz so anyone know if worst case scenario could I build or modify a search head to fit? Its a good machine so keen to get it up and running.
Thanks
Mark

I would think this would be a difficult task to build a coil for the CS4ZX without knowing the exact inductance values of the TX, RX and nulling coils. You will also need to know the correct initial phase relationship between the TX and RX coils in order to find the correct inductance balance point. However, having said that, I've just done a quick search and found the following post from headshed22. http://174.132.129.189/~moreland/forums/showpost.php?p=90718&postcount=8
In this post he says that the CS1220XD and CS4ZX coils are interchangeable.
So you might be in luck.

[3pinplug]

Qiaozhi

THANK YOU!!!!!! very much for the post

I will speak to the guy at Cscope today to confirm this and post results on here as it may help other Cs4ZX owners.

Regards

Mark

[3pinplug]

Hi all,

No response from the guy regarding interchanging of search heads, have discovered that Cscope only identified fault as eminating from search head and do not open these up to investigate any further, so may have to venture in. Anyone ever opened up a cscope search head, easy to get in and are the potted?
Thanks
Mark

[Qiaozhi]

Hi all,

No response from the guy regarding interchanging of search heads, have discovered that Cscope only identified fault as eminating from search head and do not open these up to investigate any further, so may have to venture in. Anyone ever opened up a cscope search head, easy to get in and are the potted?
Thanks
Mark

From headshed22's post, it looks like it's filled with foam.

[headshed22]

just a quick answer, Yes it will work very well indeed, the detector will simply operate at 17kHz instead of 12kHz and you will notice a small increase in the frequency of the audio tone.
Russ.

[3pinplug]

Re: Different search heads

Hi headshed22
Thank you for coming back on my mail much appreciated, two further questions if I may
1. The CS4ZX runs at around 4.5KHZ, does yours run ok as this will be quite a wide shift from this to 17KHZ?

2. Where can you get the plugs to fit the search coil cable on a CS4ZX, there the type with the screw collar.

Many thanks

Mark

[headshed22]

3pinplug.

I have not heard of any c.scope detectors running at 4.5kHz and the CS4ZX operating frequency is 12kHz. This is the same operating frequency as the CS2M and CS2MX models. Although there is a 3 way switch on the CS4ZX that shifts the operating frequency by a very small amount and was designed to stop interferance with other detectors operating nearby.

C.scope metal detectors use a hartley type oscillator to drive the coil and the operating frequency is controled by the value of capacitors wired across the coils inside the search head. From memory I believe that the inductance and resistance values for both the 12kHz and the 17kHz coils are identical. it is only the value of these 'tuning' capacitors that are different.

Your CS4ZX will be perfectly happy with the CS1220 coil installed,
With no loss of depth, stability or any other performance.
It will simply now operate at 17kHz,
instead of its original 12kHz.

Due to the audio frequency being derived from the recieved signal frequency you will simply notice a slightly higher pitch sound in your headphones (actualy a more plesant tone) and this will be the only difference.

As to where you can get the plugs for the coil cable, These are high quality IP68 rated connectors by 'LUMBERG'
If you do a google search for "lumberg circular connectors" you should find them.
but they are quite expensive.

I do believe that i have one here (will have to go and look though)

Hope this helps, any more questions i can answer just ask.

Russ.

[3pinplug]

Re: Post

Hi Russ,

Thanks for info, thats fantastic news that the head can just be wired straight on. If you do have a connector available that would be great, let me know how much you'd like for it and postage?
regards
Mark

[headshed22]

Hi Mark,
I have got a connector here, it is a used one from a CS4ZX and it has a short length of cable still attached to make it easier for you to identify the cable connections.

PM or email me your address and I will send it up to you,
Russ.

[battlecircus10]

Can the search head from a CS2M be used on the CS4ZX too then??? Does the fact that the CS4ZX is a MOTION/NON MOTION machine and the CS2M being MOTION only matter???
If I were to fit a coil from the CS2M to the CS4ZX, would that mean I would only be able to use it in MOTION mode only? I was told there were two sets of wires inside the coil of the CS4ZX; one relating to the MOTION and the other to NON MOTION modes??? I am hoping I am wrong but this is what I was led to believe from reading advice given on another forum. Thanks.

[headshed22]

battlecircus10
The search coils of the CS2M and the CS4ZX are identical and both operate at 12kHz. They CAN indeed be interchanged.
Put simply, if you were to fit your CS2M coil onto your CS4ZX then it will still operate as a CS4ZX.
The MOTION or NON MOTION mode is part of the circuit of each detector respectivley.

MOTION detectors are simply NON MOTION detectors with an auto tune circuit built in. Think of this as the detector automaticaly pressing the retune button for you.
It is a little more complicated than that, but I am trying to give you an explination that is easy to understand.

So, yes the information you recieved from another forum was indeed wrong and the CS2M and CS4ZX coils are inter-changable and each is a direct replacement for the other.

hope this helps.
Russ.

[battlecircus10]

Cool. Thanks.