Digitech Digidelay- blown inductor

[BDuguay]

I was given this non functioning Digidelay and discovered the tiny SMD inductor was burnt right off the board. In this pic from the net you can see the part in question - L5 to the right of the DC in jack. Without a schematic I'm not sure what to replace. Any ideas?
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Thanks!

[BDuguay]

[url]<a target='_blank' href='http://imageshack.com/f/mkdscn4613zj'><img src='http://imagizer.imageshack.us/v2/150x100q90/812/dscn4613z.jpg' border='0'></a>/url]

[armdnrdy]

[BDuguay]

I hate myself!!!!!
let's try this. http://www.guitarristas.info/foros/ayuda-para-reparar-digitech-digidelay/160334
3rd pic.

[snap]

tiny pic:

[BDuguay]

That deserves a "like". However, I can't handle embedding a pic let alone handing out a "like"
B.

[BDuguay]

tiny pic:

Thanks Snap. What did I do wrong?
B.

[snap]

tiny pic:

Thanks Snap. What did I do wrong?
B.

"quote" my reply, and look how it is coded.
(I took the big one image.address now from the foreign website)

[BDuguay]

I'm sure that's what I try doing every time. When you use the insert image function, will the image show if you preview the post before posting it, or just the URL?
B.

[Mark Hammer]

I can't see any of the pictures, but I'll just note that a buddy from another forum had a blown inductor on his Line 6 Tone Port.  After some consultation, we accepted that the inductor was primarily for clock noise rejection along the power line.  We replaced the inductor with a wire link and it worked like a charm.

It might be sending dogs, mosquitoes, and several species of bats into seizures, but from a human perspective, it was repaired.  Possible the blown inductor fulfills a similar function in your unit?

I'll just add that his Toneport would be used with its own power supply, and not daisy-chained with anything else.  As you are likely aware, one of the frequent bugaboos of digital pedals is that HF clock signals on the power lines can be close enough to each other that they heterodyne in annoyingly audible ways, when sharing a power line, such that a normally quiet pedal turns into a pedalboard cicada.  The inductor may be part of what protects against that.  On the other hand, as many of us here have found out, curing such problems simply requires that the digital pedals have their individual isolated supplies.

[BDuguay]

Thanks Mark.
Yes, this now blowed up inductor is part of the power in line. I'll try a jumper and report back.
B.

[snap]

I'm sure that's what I try doing every time. When you use the insert image function, will the image show if you preview the post before posting it, or just the URL?
B.

It shows the image in the preview like it will be seen for others after you post it.
("photobucket"-images might act different, though).

[Gus]

type LM2574 into a search engine
http://www.ti.com/lit/ds/symlink/lm2574.pdf

Needs the inductor to work
next search 221 surface mount inductor

How bad is the inductor burned is the PCB burned?
NEXT I would investigate for what could be causing a higher current draw that could burn the inductor
Was the wrong power adapter used? if so other parts like the 2574 might be bad.
The effect could have other bad parts

If you know what you are doing
Something to try would be to power the device with 3.3VDC (The regulator appears to be a 3.3VDC output)
HOWEVER this would need you to cut a trace or unsolder parts and have a 3.3VDC power supply

[BDuguay]

type LM2574 into a search engine
http://www.ti.com/lit/ds/symlink/lm2574.pdf

Needs the inductor to work
next search 221 surface mount inductor

How bad is the inductor burned is the PCB burned?
NEXT I would investigate for what could be causing a higher current draw that could burn the inductor
Was the wrong power adapter used? if so other parts like the 2574 might be bad.
The effect could have other bad parts

If you know what you are doing
Something to try would be to power the device with 3.3VDC (The regulator appears to be a 3.3VDC output)
HOWEVER this would need you to cut a trace or unsolder parts and have a 3.3VDC power supply

The inductor is gone and left a badly burned pad, ther one closer to the front edge of the board.
Is the 221 the part I should use to replace?
B.

[BDuguay]

type LM2574 into a search engine
http://www.ti.com/lit/ds/symlink/lm2574.pdf

Needs the inductor to work
next search 221 surface mount inductor

How bad is the inductor burned is the PCB burned?
NEXT I would investigate for what could be causing a higher current draw that could burn the inductor
Was the wrong power adapter used? if so other parts like the 2574 might be bad.
The effect could have other bad parts

If you know what you are doing
Something to try would be to power the device with 3.3VDC (The regulator appears to be a 3.3VDC output)
HOWEVER this would need you to cut a trace or unsolder parts and have a 3.3VDC power supply

The inductor is gone and left a badly burned pad, ther one closer to the front edge of the board.
Is the 221 the part I should use to replace?
B.

I see the 221 inductor you're referring to. That's not the one that blew up and left a damaged pad. The one I'm referring to is labelled L5. You can clearly see it in the big picture. It's the tiny SMD on the right side of the power in jack. The PCB has made room for a through equivalent to be used.
B.

[duck_arse]

I can see "D2" peaking under the dc jack. it might be a protection diode you're looking to replace, that in the pic looks to have a band on.

have you shown us your board yet?

[BDuguay]

I can see "D2" peaking under the dc jack. it might be a protection diode you're looking to replace, that in the pic looks to have a band on.

have you shown us your board yet?

I have the worst luck when it comes to posting pics but I'll try if it helps. I put a jumper in place of the missing inductor as per Mark Hammer's suggestion and now it lights up but does not pass signal either way. It's looking like whatever took out the inductor, likely the wrong power supply, may have done more damage along the way...
B.

[Mark Hammer]

Welcome to digital pedals.     They're a bit like child poverty, or world hunger: you know something's wrong, and you really want to be able to fix it...but you can't break it down to concrete steps and obvious repairs like you can with good old analog thru-hole.

[bluebunny]

I have the worst luck when it comes to posting pics

There is no "luck".  There is only "post" or "not post".

Your picture needs to live somewhere on the Internet*.  You need to know the URL for it and that URL needs to indicate an image - so it needs to end .jpg, .gif, .png or similar.  Anything else means it's a link to a page (or worse) deep in the bowels of botoducket or giggledox or imageshed or ...

Now press this button in your message.  It will produce [img][/img] tags.  Put your URL between them.  It might look something like this:

[img]http://www.bunnyhost.com/fluffywuffy.jpg[/img]

Hit the Preview button to check that it's visible.  If you can't see it, neither can we.  Good luck.  No, hang on ... there is no luck! 


* _{imgur.com is a good place - you don't even need an account - hell, you don't even need a file: it can "upload" from your clipboard}