Author Topic: Line/choke filter replacement  (Read 2631 times)

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Offline LiGhTMaGiCkTopic starter

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Line/choke filter replacement
« on: October 22, 2016, 04:24:49 pm »
I picked up a used model 3 Sega Genesis(Mega Drive to those not in the US) that was not functioning and found some rust and corrosion. Long story short I cleaned up and repaired some traces and bad solder joints but one component was ruined. It was in line with the power adapter input so I believe it is a line or choke filter. It is labeled "RC 04 T" and I have found a visually matching component referred to as a "CM04RC04" common mode choke filter. As it stands now the Genesis unit will function with this component removed and jumpers put in its place. The component in question is not made any more so it won't be directly replaceable. I would rather have something in its place to take up the same function so if anybody could point me to something closely compatible I would greatly appreciate it.
 

Offline NiHaoMike

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Re: Line/choke filter replacement
« Reply #1 on: October 23, 2016, 03:15:12 am »
Snap a ferrite core on the power cord as close to the unit as possible.
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Offline LiGhTMaGiCkTopic starter

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Re: Line/choke filter replacement
« Reply #2 on: October 23, 2016, 01:04:09 pm »
Snap a ferrite core on the power cord as close to the unit as possible.


That's actually what I've already done for a temporary solution but I'd like to get a drop in replacement for the failed component. Of course if it's not gonna be possible then I'll live with it as it is.
 

Online Ian.M

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Re: Line/choke filter replacement
« Reply #3 on: October 23, 2016, 01:26:20 pm »
All its there for is to keep the FCC off Sega's back by suppressing some of the noise that could be radiated via the power cord so it meets the limits of a FCC Class B digital device.   Replacing it with a footprint-compatible part not specified as an exact equivalent, may give you a warm and fuzzy feeling, but does nothing for the FCC without emissions testing.  However, if the replacement part has an adequate current rating, is intended for a similar application, you already have it, and the board is in good enough condition to withstand the rework,  you might as well fit it, as it *MAY* help with EMC.
 
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Offline LiGhTMaGiCkTopic starter

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Re: Line/choke filter replacement
« Reply #4 on: October 23, 2016, 04:29:50 pm »
All its there for is to keep the FCC off Sega's back by suppressing some of the noise that could be radiated via the power cord so it meets the limits of a FCC Class B digital device.   Replacing it with a footprint-compatible part not specified as an exact equivalent, may give you a warm and fuzzy feeling, but does nothing for the FCC without emissions testing.  However, if the replacement part has an adequate current rating, is intended for a similar application, you already have it, and the board is in good enough condition to withstand the rework,  you might as well fit it, as it *MAY* help with EMC.

That works for me I guess. I just wasn't sure whether it was really necessary or not.
 

Offline sv

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Re: Line/choke filter replacement
« Reply #5 on: May 16, 2021, 07:04:51 pm »
Came across this thread when I was searching for the same part and thought I'd add an update for posterity's sake. As of May 2021, the CM04RC04T is available for purchase from Quest Components: https://www.questcomp.com/part/4/cm04rc04t/141651187?utm_source=octopart&utm_medium=industry-cpc&utm_campaign=partsearch

I purchased a reel of 20 for $40.

Also, you can find the Taiyo Yuden datasheet for this part here: https://ds.yuden.co.jp/TYCOMPAS/ut/detail?pn=CM04RC04T++&u=M
« Last Edit: May 16, 2021, 07:06:50 pm by sv »
 
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