A broken cambridge audio A1 MK3

[katanassn]

This amp seems to have an internal fuse poping problem. When I replaced the fuses the internal outputs, well the chips attached to the big heatsinks, marked TDA1514A got hot and smoked.

Well you can't get these chips easily so was wondering what other chip would fit in it's place. As I would rather fix the amplifier than bin it.

Thanks for the help and advice

 

[Leolabs]

I think should get yourself the datasheet of TDA1514 before going further.

 

[katanassn]

Cricklewood electronics have stated that it's an amplifier chip

But searching here give me the impresion it is a digital to analougue converter chip.

 

[sreten]

http://www.datasheetcatalog.com/datasheets_pdf/T/D/A/1/TDA1514A.shtml

I'd say fitting any other chip is not possible. Its definitely not a D/A converter.

You should try and isolate the problem before building a pile of smoking chips.

/sreten.

 

[richie00boy]

Yes always find what caused the fuse to blow before simply putting in a new fuse.

You likely have broken the chips now if they smoked.

They should be quite easy to find and is definitely an amplifier chip. Check ST and Philips websites.

 

[mastertech]

karanasn-
This amp seems to have an internal fuse poping problem. When I replaced the fuses the internal outputs, well the chips attached to the big heatsinks, marked TDA1514A got hot and smoked.
-----------------------------------------------------------------
first,replace the chip(s) and then replace the fuse(s)

 

[anatech]

Hi katanassn,
I've replaced many of those IC's. It comes down to customer abuse, one short is enough to do it. I don't know of a plug in sub.

So mastertech is right, replace chip(s) and then fuses. Clean and regrease the heatsink in the course of your repair. Make sure the load (wires and speakers) is okay before reconnecting.

-Chris

 

[baggins]

Ive just been robbing components (caps) off an old tele pcb and there is a TDA 2514 markes on the board as audio and 2 connectors audio left/right nearby if this is any use to you I,ll yank it out and post it to you .

Bill.

 

[katanassn]

Thanks everybody for the help and advice

Ive just been robbing components (caps) off an old tele pcb and there is a TDA 2514 markes on the board as audio and 2 connectors audio left/right nearby if this is any use to you I,ll yank it out and post it to you .

Bill.

Thanks for the offer but I need two 1514a. There is someone selling them on here for a few euro's so that what i'll probably do.

I don't know what caused them to pop but as I let a friend borrow it and it returned popped so he could have shorted the speaker cables.

Should i remove the chips and see what the supply voltages are to the chips so I can see if it's in chips tolerances tolerances or just swap them and hope?

 

[baggins]

I,m no great shakes as an electronics engineer (HNC Mech Eng.)
but my advice would be to find out which pins the 1514 feeds its outputs to and measure the resistance to earth in case of a dead short somewhere .Other than that check the vcc and earth rails are all at their quoted volts BEFORE replacing the chips.I hope this advice is correct its what I would do but there are far wiser heads than mine on these forums!!

 

[anatech]

Hi baggins,
Normally it's only the chip that goes. There isn't much else (zobel, possible relay, output terminal). It's the load and wiring that causes trouble.

-Chris

 

[katanassn]

Ok I'll test it and then get back to you with figures or ideas of.

Thanks for the help