what is this component? (surface mount)

[marko]

hi all, got this diamond audio d7065 i'm trying to fix up, but i can't find any info on this transistor(?) it's a surface mount part and has f007 056 on it! any help would be much appreciated

An externally hosted image should be here but it was not working when we last tested it.

 

[1moreamp]

Try this Marko.... PMBTA56

 

[marko]

thanks cecil, just had a quick look on ebay but can only find someone selling a reel of them!!

the amp works but has distorted output after a few moments... this part has a small hole in it and ohming out very low so a good place to start swapping parts out!

does anyone know what the deal is with diamond audio and esoteric audio? the board has esotric audio on it (was taped over at factory!). this one has #2 on the referance plate so a little special

 

[marko]

...also, looking at the data sheet PMBTA56 only has 2 legs on one side where as mine has 3 legs

 

[Perry Babin]

I think he meant PZTA56.

 

[Mooly]

If you can identify it spec wise fit a legged part-- it's been done many times before. You have loads of space in there. You can confirm PNP or NPN by comparing with the other side. See what voltages the other has across it and work from there.
If it's got a hole in it there are almost sure to be other failed parts, check and compare carefully before powering up. That transistor on the heatsink in front of it looks discoloured- the PCB at any rate.
Regards Karl

 

[marko]

that discolouration is flux from 2 new 2sa1303's i fitted (that i didn't need to in the end )

 

[1moreamp]

The part number came off of my Diamond print for a D7401. But Perry could be right about the part number as he posted it, and the print I have could have a typo. Have you checked WWW.FindChips.com for a search.

 

[gmphadte]

Just use a leaded equivalent.

Gajanan phadte

 

[marko]

Just use a leaded equivalent.

Gajanan phadte

i'm struggling to find anything to be honest!

 

[Perry Babin]

If the part is indeed a PZTA56, you can use an MPSA56 temporarily. They are electrically equivalent but the case of the PZTA allows it to dissipate more heat. If the PZTA ran hot, the MPSA56 is likely to fail but it should allow you to do further testing.

 

[marko]

i'm struggling to find PZTA56 over here in the UK any suggestions anybody? rs components or cpc arn't listing this device either...

 

[theAnonymous1]

i'm struggling to find PZTA56 over here in the UK any suggestions anybody? rs components or cpc arn't listing this device either...

I can get you all the PZTA56 you want, but it would be 2-3 weeks before they end up on your side of the pond.

 

[marko]

I can get you all the PZTA56 you want, but it would be 2-3 weeks before they end up on your side of the pond.

email sent

 

[marko]

i got the parts yesterday, many thanks!!!

it took me all of 30 seconds to solder the new part in with my new miniature soldering iron and it now works and sounds a treat, i'm really happy i got this working, she's a beauty and number 2 off the production line as well!!

mark.

 

[EWorkshop1708]

Is the resistor nearby still discolored or did you change that too?

(see the picture, only the resistor near the blown transistor is darker than the rest)

 

[damage]

Is the resistor nearby still discolored or did you change that too?

(see the picture, only the resistor near the blown transistor is darker than the rest)

I was gonna say those outputs don't look like the solder pad is too healthy either.

 

[1965GTO]

Esoteric Audio had a high end amplifer line, then got into a bit of financial trouble and sold it to Diamond Audio. Both companies are located in Arizona , USA. Esoteric is now in the audio/video connective business, IE: HDMI cables, audio RCA cables etc...

 

[marko]

i didn't change the resistor as it was still ohming out ok, it looked like it just got a liitle hot!

as for the transistor pads, they're 100% ok, what you see is a little bit of brown flux from soldering in new parts, i've since cleaned all this off

 

[1moreamp]

Glad it worked out for you Marko. Next time you run across one of these LMK I have 5 spare boards for parts. They all seemed to die the same death due to badly wound rail filter toroid coils that liked to short out on themselves and place a dead short on the entire power supply.
Yours was the first one I have ever seen with a driver failure. Other issues were the upright filter / front end boards....C