Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old October 4th 18, 08:48 AM posted to sci.electronics.repair
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Default Can I remove the choke?

I have an older laptop PC. It has a inline transformer. In other words,
the transformer is between the wall plug and the PC. The little plug
came off where it plugs into the PC. I have some of those plugs, but
there is not enough wire between a cord choke, that is right at the end
of the cord by the PC. It's molded on the wire so I cant move it.

What would happen if I just remove it and put my plug on without that
choke? What are those chokes for anyhow? I can understand them on video
cords and so on, but why are they needed on a power cord?

If I can install my plug without the choke, I will, and that will only
be for a short time. I bought a new cord on ebay, but I use that
computer all the time and dont want to wait till I get the ebay one.
After that, the repaired one will only be a backup cord.


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Old October 4th 18, 09:51 AM posted to sci.electronics.repair
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Default Can I remove the choke?

Clifford Heath wrote:
On 04/10/18 17:48, wrote:
I have an older laptop PC. It has a inline transformer. In other words,
the transformer is between the wall plug and the PC. The little plug
came off where it plugs into the PC. I have some of those plugs, but
there is not enough wire between a cord choke, that is right at the end
of the cord by the PC. It's molded on the wire so I cant move it.

What would happen if I just remove it and put my plug on without that
choke? What are those chokes for anyhow? I can understand them on video
cords and so on, but why are they needed on a power cord?

If I can install my plug without the choke, I will, and that will only
be for a short time. I bought a new cord on ebay, but I use that
computer all the time and dont want to wait till I get the ebay one.
After that, the repaired one will only be a backup cord.


The choke tries to kill EMI coming out of the computer.
Cut it off, and buy a snap-on one to go over the finished cable.


Or cut it off, then demolish the plastic molding that fixes it to
the cable (revealing the ferrite core), put that on the cable before
you attach the plug, and fix it in the way you like.
Suggestion: use two small cable ties around the cable on each side
of the core to fix it in place, then put suitable heat shrink tubing
around the whole thing for better appearance.
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Old October 4th 18, 11:36 AM posted to sci.electronics.repair
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Default Can I remove the choke?

On Thursday, 4 October 2018 08:53:42 UTC+1, wrote:

I have an older laptop PC. It has a inline transformer. In other words,
the transformer is between the wall plug and the PC. The little plug
came off where it plugs into the PC. I have some of those plugs, but
there is not enough wire between a cord choke, that is right at the end
of the cord by the PC. It's molded on the wire so I cant move it.


Can I remove the choke?


yes, they work fine without. If you want you could also strip the ferrite ring & slip it onto the flex, or slip a different one on.


NT
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Old October 4th 18, 10:03 PM posted to sci.electronics.repair
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Default Can I remove the choke?

If you want to restore the functionality of the original "choke" which is actually a ferrite bead, you'd need to find the equivalent of the original part. And it's not like they are marked.

Just cut it off, it'll work fine. Those are placed on there to meet regulatory requirements. The radiated emissions levels from common equipment are very low, and the susceptibility of adjacent equipment is very good. You'll have no issues.

I spent several years running an EMC lab. I had a hand in putting those ferrites on many pieces of equipment, not to solve a real problem, but to get the equipment to comply with regulations. There were a very few cases where the ferrites were installed to solve a susceptibility problem, one that happened at ridiculously high field strengths in every case.


On Thursday, October 4, 2018 at 3:15:21 AM UTC-5, Clifford Heath wrote:
On 04/10/18 17:48, wrote:
I have an older laptop PC. It has a inline transformer. In other words,
the transformer is between the wall plug and the PC. The little plug
came off where it plugs into the PC. I have some of those plugs, but
there is not enough wire between a cord choke, that is right at the end
of the cord by the PC. It's molded on the wire so I cant move it.

What would happen if I just remove it and put my plug on without that
choke? What are those chokes for anyhow? I can understand them on video
cords and so on, but why are they needed on a power cord?

If I can install my plug without the choke, I will, and that will only
be for a short time. I bought a new cord on ebay, but I use that
computer all the time and dont want to wait till I get the ebay one.
After that, the repaired one will only be a backup cord.


The choke tries to kill EMI coming out of the computer.
Cut it off, and buy a snap-on one to go over the finished cable.

Clifford Heath.


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Old October 4th 18, 11:44 PM posted to sci.electronics.repair
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Default Can I remove the choke?

On Thu, 4 Oct 2018 10:09:32 -0400, Ralph Mowery
wrote:

In article ,
says...

I have an older laptop PC. It has a inline transformer. In other words,
the transformer is between the wall plug and the PC. The little plug
came off where it plugs into the PC. I have some of those plugs, but
there is not enough wire between a cord choke, that is right at the end
of the cord by the PC. It's molded on the wire so I cant move it.



The choke is to help stop the computer and switching power supplies from
sending out signals that can cause reception problems with other
receivers.

As far as the computer goes it is not needed at all. Without it any
device near by that has a receiver may not work correctly. That can
include the wireless mouse and keyboard or wifi modem that is used with
the computer you are using. Mostly rare cases, but can hapen.
FM radios may not work well that are near by.


Thanks for everyone's help!!!


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