Can you identify this electrical component? Help needed ASAP!!!

[mavster 10+ year member]

I'm repairing this amp, and for the life of me I can't figure it out...

Its for a lightning audio storm X1000.1D...

Thanks...

Click to read more...

 

[uPsDdOWN 10+ year member]

Looks like a homemade rectifier?? The jury is still out on that one without a schematic--- of MORE Concern is the brown (overheated) solder joints on the left -- the only one that looks good on that board is the one on the right... good clean traces, good solder joint.

 

[mavster 10+ year member]

yeah, I am going to remove all the components and resolder them...just trying to identify everything and get things ordered before I start.

 

[mavster 10+ year member]

According to the schematic...it seems to be a 50k ohm resistor?

 

[uPsDdOWN 10+ year member]

I did a little mmore research..and my first answer is probably wrong... I spoke with one of my techs and we believe it is a thermo-couple. (homemade from spare parts it seems) It's basically a variable resistor that changes value as the heatsink heats up to keep the transistor's bias voltages balanced.

EDIT: hehe-- ya, we posted about the same time.... it is a variable resistor--the spade pulls/sinks heat from that "buss-BAr"/Heatsink.

 

[mavster 10+ year member]

i have two of these that I am repairing...this on the other amp broke off...

 

[mavster 10+ year member]

tracked down the schematic;

Now, where do I find these?

 

[uPsDdOWN 10+ year member]

//content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif A Cold solder joint can and will cause problems....The brown looking stuff is solder flux from an over heated iron and/or bad flux and/or not cleaning up afterwards...Seen it before...causes all kinds of problems when it heats enough to conduct...

gimme a min and I will see if I can find a parts house with em???

 

[Immacomputer 10+ year member]

It looks like a thermistor which was described above.

For every component you could ever want/need, check out http://www.mouser.com They have tons of parts and great prices as well as fair shipping. It's where I find almost everything I need. Be careful when ordering parts though; read the spec sheet and make sure that it is the correct size. I've seen some thermistors that are only 1mm wide or so when I was ordering some of mine.

 

[uPsDdOWN 10+ year member]

Good Link IMMACOMPUTER-- sounds like you have some experience in this field? I know just enough to get me in trouble but my Go-To person is pretty proffecient at it... it looks like He's in the switching power supply... look at the schematic. The resistor he's working with is there to stabilize the output verses heat.

 

[uPsDdOWN 10+ year member]

I think if you're having trouble with the MosFets, cleaning and resoldering the connections is a good idea. After your done use a little bit of 90% alcohol to clean what residue is there. Let it dry off before adding power. It should only take a few seconds to flash off. Q-Tips works great for this my guru tells me.

 

[mavster 10+ year member]

I use 90% alcohol and these Qtips that do not have fibers...its sort of like a thick sponge...

I find they are better...more durable

 

[Confusedsoul 10+ year member]

Actually, I believe you're looking for a 50k Ohm Thermistor, not thermocouple. Looks like its a radial type soldered onto the board, and taped/attached to a spade connector.

Immacomputer beat me to it.

 

[uPsDdOWN 10+ year member]

Are these the ones that look like doe or lamb skin? Just so used to the word Q-Tip ya know... LOL on the thermocouple.... sort of used the wrong term... blame the guru... she's the one who told me...LOL There should be a temperature rating somewhere on the part.

 

[Confusedsoul 10+ year member]

Are these the ones that look like doe or lamb skin? Just so used to the word Q-Tip ya know... LOL on the thermocouple.... sort of used the wrong term... blame the guru... she's the one who told me...LOL There should be a temperature rating somewhere on the part.

50k Ohm should correspond to 150C

Edit: NVM

 

[uPsDdOWN 10+ year member]

http://en.wikipedia.org/wiki/Thermistor

Goodnight

 

[mavster 10+ year member]

took a closer look at the component, no markings what so ever, besides the identifer on the board.

 

[uPsDdOWN 10+ year member]

Yup, that's what she was afraid of. I had her look at the photo and she basically said that a lot of companies will deface the original part number and sub their own. If there are no part numbers you may have to order by part location and description from the manufacturer. Problem is you don't know if you have a NTC or PTC thermistor to go with a generic brand.

PTC= positive temperature coefficient

NTC= negative temperature coefficient

 

[uPsDdOWN 10+ year member]

Yup, that's what she was afraid of. I had her look at the photo and she basically said that a lot of companies will deface the original part number and sub their own. If there are no part numbers you may have to order by part location and description from the manufacturer. Problem is you don't know if you have a NTC or PTC thermistor to go with a generic brand.

PTC= positive temperature coefficient

NTC= negative temperature coefficient

 

[uPsDdOWN 10+ year member]

Yup, that's what she was afraid of. I had her look at the photo and she basically said that a lot of companies will deface the original part number and sub their own. If there are no part numbers you may have to order by part location and description from the manufacturer. Problem is you don't know if you have a NTC or PTC thermistor to go with a generic brand.

PTC= positive temperature coefficient

NTC= negative temperature coefficient