What kind of part is EMI301 on a Amiga 3000D ?

salocinx · 01 September 2016, 19:22

Hi - I am working on my "new" Amiga 3000D. I found a blue part that looks damaged. But in order to replace, I need to know what kind/value it is.

Here's an image, it's directly connected to the external Serial port. On this schematics of the Amiga 3000D, it's part number EMI301.

Is this a resistor or a capacitor? Does somebody know the exact value?

Wrangler · 01 September 2016, 20:05

I could be wrong, but I thought they are just fuses.

mark_k · 01 September 2016, 20:26

It's to do with limiting electromagnetic interference (EMI). I'm not sure of the exact function, but they're not fuses. They may contain a capacitor which is connected to ground on one side.

If you're sure the function of that part is affected (and not just cosmetic damage) you could probably remove it and solder a wire link in its place. But first I'd check with a multimeter/continuity checker, as replacing it may not be necessary.

Edit to add: it's possible that something like the products shown here contain similar components embedded into them.

idrougge · 01 September 2016, 21:48

It's a ferrite bead inductor.

salocinx · 01 September 2016, 21:55

Okay thank you! As suggested, I'll check the Serial port first, before replacing the part(s). It just attracted my attention while repairing the battery damage.

01 September 2016, 19:22	#1
salocinx Registered User Join Date: Jan 2014 Location: St.Gallen / Switzerland Posts: 84	What kind of part is EMI301 on a Amiga 3000D ? Hi - I am working on my "new" Amiga 3000D. I found a blue part that looks damaged. But in order to replace, I need to know what kind/value it is. Here's an image, it's directly connected to the external Serial port. On this schematics of the Amiga 3000D, it's part number EMI301. Is this a resistor or a capacitor? Does somebody know the exact value?

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01 September 2016, 20:05	#2
Wrangler Registered User Join Date: Sep 2015 Location: London, UK Posts: 419	I could be wrong, but I thought they are just fuses.

01 September 2016, 20:26	#3
mark_k Registered User Join Date: Aug 2004 Location: Posts: 3,349	It's to do with limiting electromagnetic interference (EMI). I'm not sure of the exact function, but they're not fuses. They may contain a capacitor which is connected to ground on one side. If you're sure the function of that part is affected (and not just cosmetic damage) you could probably remove it and solder a wire link in its place. But first I'd check with a multimeter/continuity checker, as replacing it may not be necessary. Edit to add: it's possible that something like the products shown here contain similar components embedded into them.

01 September 2016, 21:48	#4
idrougge Registered User Join Date: Sep 2007 Location: Stockholm Posts: 4,357	It's a ferrite bead inductor.

01 September 2016, 21:55	#5
salocinx Registered User Join Date: Jan 2014 Location: St.Gallen / Switzerland Posts: 84	Okay thank you! As suggested, I'll check the Serial port first, before replacing the part(s). It just attracted my attention while repairing the battery damage.

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