its DEFINITELY GREY.

Fair enough. To me the photo was ambiguous but I guess I'm the only one. Carry on.

 

Fair enough. To me the photo was ambiguous but I guess I'm the only one. Carry on.

Fair enough. To me the photo was ambiguous but I guess I'm the only one. Carry on.

the color im concerned with is the "violet" im not sure if its "violet or "blue"

 

How about it F-word doesnt matter just put in any decent part of that kind? You waste time. Thats what I would tell you if you are on a job.

I dont say you have it but autistic people insist on irrelevant details and they are rude and aggressive too for no reason. As well they dont listen if you tell them things.

 

How about it F-word doesnt matter just put in any decent part of that kind? You waste time. Thats what I would tell you if you are on a job.

I dont say you have it but autistic people insist on irrelevant details and they are rude and aggressive too for no reason. As well they dont listen if you tell them things.

doesnt matter just put in any decent part of that kind?
great advice.

 

Unsolder it and measure the inductance.

 

doesnt matter just put in any decent part of that kind?
great advice.

yup. it very likely makes no difference. when you repair a thing like this you have to understand what the part does (I do actually), if not, you are not able to understand advice.

How about just trying 8.2 first then 4.7 or otherwise round?

8.2 or 8.7 makes no actual difference it's not a FM tuner.

I already said it is likely for noise filtering (could be just bridged perhaps), and the fact it is burned makes it very likely there is more damage.

If you have the board in front of you why dont you test the pins and write this information?

Instead you copy from the manual a very large image, info I already wrote.

 

Unsolder it and measure the inductance.

You missed the part about, "This is a photo my friend sent me. I don't have the part available to measure".

 

Unsolder it and measure the inductance.

yeah i dont actually have it. when i discovered it...it was broken in two peices and burned. i got the picture from a friend who had the same keyboard and took a picture of the part that was burned.

 

These coils have a thin wire so it was really totally charred? Do you still uhm, have it?

 

nah i threw it away. i seen it inside it was some very thing gauge coper wire. anyways i tested the ic to ground. the only place that tested continuity was the pin marked ground on the chip. PIN 16, or neither of the holes where the inductor was test for continuity at ground....

 

ah great. Sorry if I offended you. But the other end must go somewhere? How about poking a wire through it + make a photo from it. If it is too difficult to search yourself where it goes.

 

ah great. Sorry if I offended you. But the other end must go somewhere? How about poking a wire through it + make a photo from it. If it is too difficult to search yourself where it goes.

 

its a multilayer. on the top side (3 holes) it goes into another layer (very likely a power supply layer).
On the other side it does connect to the left side capacitor.

My guess is the local supply for the FDC is filtered through the inductor.

it is too large and has too high DCR, or the FDC is damaged too.

There is no other purpose I can think of that makes sense.
8.2mH should be fine but I'd use a small potcore (they have much thicker wire).

Panasonic makes them. you can try but chances are the chip isnt OK too.
You can try with the floppy pulled off, and measure the current the chip takes, if any,
with a new inductor.

Value doesnt really matter much.

So this is my opinion.

 

its a multilayer. on the top side (3 holes) it goes into another layer (very likely a power supply layer).
On the other side it does connect to the left side capacitor.

My guess is the local supply for the FDC is filtered through the inductor.

it is too large and has too high DCR, or the FDC is damaged too.

There is no other purpose I can think of that makes sense.
8.2mH should be fine but I'd use a small potcore (they have much thicker wire).

Panasonic makes them. you can try but chances are the chip isnt OK too.
You can try with the floppy pulled off, and measure the current the chip takes, if any,
with a new inductor.

Value doesnt really matter much.

So this is my opinion.

do you have a link to a suitable product?

 

chances are if it has just burned out, something else is damaged too.
I'd really just try 8200uH or 4700uH, guess maybe it is used as a filter coil.
RF inductors with 8200uH have a fairly high Dc resistance actually.

I think takao21203 said it well. Throw another equivalent inductor in there, and see what happens. If the inductor pops, then you know it's UPD72069.

You can use either the 8.2 mH inductor, or two 4.7 mH inductors in series (9.4 mH).

 

do you have a link to a suitable product?

They are not easy to buy as single piece. I have some here actually, 8.2mH and 10mH, both small potcores.

I'd suggest to solder just one end, and then dip with a DMM (measuring Amperes). If it goes too high, there is another problem too.