Snap crackle pop, I KILLED MY AMP PLEASE HELP!!!

imperfectcircle · 5th February 2007, 03:35 PM

Ok so I posted a few weeks ago about repairing my Exposure XV integrated amp Need some help fixing my amplifier(Exposure XV)

So I descided to order both the ZTX452 and 552 and replace them. Turns out the parts are no longer made and have been replaced by the ZTX453 and 553 which are rated for a slightly higher voltage 120v verses 100v. So I replace the two parts in the power supply of my amp. And I plug it in and about 10seconds late POP, POP and two 47uf Philips capacitors completely exploded. I don't know what I did wrong and now Im afraid I did more damage then I started with

Now I know you guys probably cant help to much without a schematic, Im still trying to find one. But if there is any advice or help you can offer i would really appreciate it. I love this little amp, it was my first piece of real hifi equipment. Here is a pic of the original parts, you can see the crack in the ztx552.

Netlist · 5th February 2007, 03:41 PM

The drawing on the PCB indicates that the cracked part is mounted the wrong way.

Edit: I'll add 'maybe' as the other transistor would be wrongly connected as well.

/Hugo

imperfectcircle · 5th February 2007, 03:42 PM

Heres a picture of the capacitors before the Exploded, there wqasnt much left of them afterwards. Other than those capacitors nothing else looks fried, maybe I got lucky.

richie00boy · 5th February 2007, 03:43 PM

I don't think it does Hugo. ZTX parts are e-line case which is quite flat one both sides. The printing is always on the rounded side.

Can you post a schematic or at least explain what the original fault was in the first place. Maybe more went than just those two transistors and it's still broken which is killing them again.

imperfectcircle · 5th February 2007, 03:45 PM

Heres the whole amp before I killed it. I have hi-res pics if anyone would like to take a look and maybe help me?? Im still waiting to hear from Exposure about getting a schematic.

imperfectcircle · 5th February 2007, 03:48 PM

It was working fine until on day it just died. I opened it up and one of the little transistors was cracked, so I am asumming thats what caused it to die? I rechecked the ztx553 and 453 to see if they are in correctly and it look like I have it right. The side with the writing is the rounded side, correct.

richie00boy · 5th February 2007, 03:50 PM

Rule #1: never assume anything when repairing electronics.

See my last sentence in previous post.

imperfectcircle · 5th February 2007, 03:51 PM

Now that you said they lok to be in the wrong way according to the pcb, is making me wonder if maybe they are in backwards? Maybe the new parts are the opposite? Could that cause those capacitors to explode like that??
thankls

Netlist · 5th February 2007, 03:51 PM

Yes, most likely. Disregard my post.

/Hugo

imperfectcircle · 5th February 2007, 03:53 PM

If there was more wrong then the transistors wouldnt those capacitors have exploded origionally? They were fiune until I replaced the transistors. Im thinking that I put them in backwards even though I put them in the same way as the orgionals. I think possibly the newer parts are labeled in reverse compared to the old ones.

5th February 2007, 03:43 PM	#4
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	I don't think it does Hugo. ZTX parts are e-line case which is quite flat one both sides. The printing is always on the rounded side. Can you post a schematic or at least explain what the original fault was in the first place. Maybe more went than just those two transistors and it's still broken which is killing them again. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

5th February 2007, 03:50 PM	#7
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	Rule #1: never assume anything when repairing electronics. See my last sentence in previous post. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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5th February 2007, 03:41 PM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	The drawing on the PCB indicates that the cracked part is mounted the wrong way. Edit: I'll add 'maybe' as the other transistor would be wrongly connected as well. /Hugo

5th February 2007, 03:48 PM	#6
imperfectcircle diyAudio Member Join Date: Jan 2005 Location: nyc	It was working fine until on day it just died. I opened it up and one of the little transistors was cracked, so I am asumming thats what caused it to die? I rechecked the ztx553 and 453 to see if they are in correctly and it look like I have it right. The side with the writing is the rounded side, correct.

5th February 2007, 03:51 PM	#8
imperfectcircle diyAudio Member Join Date: Jan 2005 Location: nyc	Now that you said they lok to be in the wrong way according to the pcb, is making me wonder if maybe they are in backwards? Maybe the new parts are the opposite? Could that cause those capacitors to explode like that?? thankls

5th February 2007, 03:51 PM	#9
Netlist diyAudio Moderator Join Date: Jan 2003	Yes, most likely. Disregard my post. /Hugo

5th February 2007, 03:53 PM	#10
imperfectcircle diyAudio Member Join Date: Jan 2005 Location: nyc	If there was more wrong then the transistors wouldnt those capacitors have exploded origionally? They were fiune until I replaced the transistors. Im thinking that I put them in backwards even though I put them in the same way as the orgionals. I think possibly the newer parts are labeled in reverse compared to the old ones.

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