Ok for about the last week my amp on my computer has been making that weird electrical burning smell when ever its been turned up reasonably loud, and in the week of use nothing has happened and it still works,

so i pulled off the cover today and noticed a completely burnt lil component(diode or sumthing) and it looks like it has burst but the amp still functions as normal,

Would any one know how i could work out wat it is so i can put a new one in was the same as the horizontal blue tube ones on the left but now its black and burst, its in the center roughly of the pic
Oh, its a DSE 2x80rms amp

i can't click on the photo??

blue things look like metal film resistors



should be available from DSE or Jaycar

ask Stik 79

- Stooge007 out

There would be a reason for that component burning out, shouldnt it be under warranty those amps arent that old, unless u bought it when it first came out. Whats the part number on the board around the burnt component there will be a number most likely in white writing. sumthing like R123, or C234, or D345. If its R123 it would be a resistor, Cxxx would be a cap, Dxxx would be a diode

yeah, no point replacing it until you fix what caused it to blow.

but then again, maybe it's the speakers you got connected to it?

its been running the same speakers for about 2 years now so i think its just because of the age of it,

its got R222 next to it so i guess its a resistor any way to tell the size/value of the resistor? i got a MM but wats it need to be set too

its exactly wat stooge007 has a pic of

same number/colour/order of bands?

Is it charred beyond recognition?

http://www.dannyg.com/examples/res2/resistor.htm

Resistor colour code calculator.

ok here is a new pic i hope this works this time

The resistor is burnt to a crisp i poked it with a probe on the MM and a bit of the casing fell off


EDIT: does any one have one of the dse amp thay would take the case off and tell me the colour bands on the resistor, it woudl be a great help

Unless u can ring DSE, not just the retail shop try and find out who does there repairs, give them a call and see if they can tell u the value of that part number. that looks like a heavier wattage resistor sumthing like a 1 watt.

i dont think it does much thou, cause ya can see in the pic that it is busted and watever was in it is over the board, but it still works perfectlyexcept for the smell at higher volumes so could i just remove it? and not replace

trust me, if it was possible to run long-term without it, it probably wouldnt be there. Amps are designed to a budget, the more components, the more expensive, so they try and parse things down a lot.

it looks like there's another R222 next to the heatsink in the middle of the pic???

looks a bit like green, brown, brown, gold but it's a bit hard to tell from the pic.

that should be the one you want

- Stooge007 out

Its a resistor..
Resistor = Resistance = Waste Power = Heat
Which in your case = burnt.

That looks like a 1W resistor.. there must be a tonne of juice flowing thru it to melt down like that.

You cant test for resistance in circuit, you'll have to desolder it and remove it (hope it doesnt fall apart while doing it) and then hit it with the DMM in OHM mode.. then hope it isnt so burnt that its electrical properties have changed (IE. resistance changed).

Ignore the R222 printed on the PCB, thats just a schematic reference number not a value. If you can get the schematics for the amp *doubtful* and look up R222, it will show you where in what circuit its located, and the value of that componant.

yes but if theres more than one "R222" on the board, surely they'd be referring to the same component?

Well if the resistor has burst then it woudlnt be functioning anyway, so why is the amp still working without it?
ill give a DSE service center a call this arvo

The resistor was probably wired in parallel to get a certain impedence for a circuit. Without it the circuits now at a different impedence. only a matter of time untill something else blows, and it could be big.

I'll put money on a bridging rectifier going next

There shouldnt be 2 componants with the same schematic name, otherwise when you check it how would you know which one is in which circuit ?

Well DSE rung me back its a 10ohm resistor
http://www.dse.com.au/cgi-bin/dse.storefro...duct/View/R1026

and a $0.04 i think its a great buy

from it's location, there should be another just like it about 2" away, hidden by the white 'fibreglass' sheathing in the picture.

try replacing it, but you'll find it may just burn again.

if it's a 2 channel amp, there will likely be anb R222 for each channel.
A bit dumb, but have seen it that way before.

ok i just seen stooge007 last post about there being a same resistor on there aswell and i just put the colours into the calculator selfdestruktor put up and it came up with resistence value = 510 ohm, +/-5%
compaired to wat a DSE service center said of 10ohm so wat do i go for?