A broken cambridge audio A1 MK3

katanassn · 15th January 2006, 08:02 PM

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 · 16th January 2006, 01:47 AM

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

katanassn · 16th January 2006, 01:04 PM

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 · 16th January 2006, 01:13 PM

http://www.datasheetcatalog.com/data...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 · 16th January 2006, 01:37 PM

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 · 17th January 2006, 03:23 AM

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 · 17th January 2006, 04:06 PM

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 · 17th January 2006, 04:39 PM

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 · 18th January 2006, 10:53 AM

Thanks everybody for the help and advice

Quote:

Originally posted by 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.

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 · 19th January 2006, 05:10 PM

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!!

15th January 2006, 08:02 PM	#1
katanassn diyAudio Member Join Date: Sep 2005	A broken cambridge audio A1 MK3 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

16th January 2006, 01:37 PM	#5
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	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. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

17th January 2006, 04:39 PM	#8
baggins diyAudio Member Join Date: Jan 2006 Location: haverfordwest,pembrokeshire	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. __________________ heretics are sometimes right

19th January 2006, 05:10 PM	#10
baggins diyAudio Member Join Date: Jan 2006 Location: haverfordwest,pembrokeshire	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!! __________________ heretics are sometimes right

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16th January 2006, 01:47 AM	#2
Leolabs diyAudio Member Join Date: Dec 2004 Location: Bukit Mertajam	I think should get yourself the datasheet of TDA1514 before going further.

16th January 2006, 01:04 PM	#3
katanassn diyAudio Member Join Date: Sep 2005	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.

16th January 2006, 01:13 PM	#4
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	http://www.datasheetcatalog.com/data...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.

17th January 2006, 03:23 AM	#6
mastertech Banned Join Date: Mar 2005 Location: Australia	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)

17th January 2006, 04:06 PM	#7
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	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

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