Help IDing a transistor

[TheJames]

This might be a little hopeless, but here goes..

I've got an Orion 32 on the desk that I'm attempting to resurrect.  It had a toasted opamp, fixed that...But now there appears to be a transistor (or something) that's fused.  Attached is a pic...From what I can tell the markings are "XL 49"  Any ideas?

https://www.dropbox.com/s/3alg1gdd290vprv/o32output.jpg?dl=0

 

[Khron]

There's a (good?) chance it could be a Rohm 2SD2704K. The package fits, the "XL" marking fits, and the datasheet says in large print "For muting".

 

[TheJames]

Not sure how you pulled that out, but it does indeed look like a good fit.

THANKS!!!

 

[Khron]

S-manuals.com has a usually-good-enough SMD code section, that's where I found this. For more "exotic" stuff, I've found chips.tomsk.ru to be much more comprehensive, but even that's nowhere near "complete".

 

[abbey road d enfer]

"the datasheet says in large print "For muting"."
I must say that, seeing the picture, it looked suspiciously like a mute circuit.
A nice and simple way of knowing is to just lift off the suspicious one and see what happens.
If the unit works normally, with only transient clicks* whenever, that would confirm.

* Don't turn the speakers too loud when you test 

 

[rackmonkey]

S-manuals.com has a usually-good-enough SMD code section, that's where I found this. For more "exotic" stuff, I've found chips.tomsk.ru to be much more comprehensive, but even that's nowhere near "complete".

Nice resources, Khron. Thanks!

 

[TheJames]

Just wanted to add, I got the 2SD2704K in and everything works as expected.

Channel 7 of this unit took a nasty hit.  Burned up an SMD resistor, fused the mute transistor, and took out the opamp driving the output.

I tacked in a couple of regular through-hole resistors, swapped out the opamp (LME49725 which aren't available anymore), and replaced that transistor.  Life is good.

Again, thanks Khron for the info and resources!!