ZAPpulse and S&B TX102 = smoke, help!

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#21
Tenson said:
Hello again!

I got the bits to fix my ZAP amps today. I replaced the orange cap at the input of one of them and the 2R2 resistors at the output with 5watt types (is that enough? Looked about right).

Now I plugged them in to the output from my soundcard which had been working okay before, and while it does seem to work alright I notice that the resistors still get very hot. How do other peoples 2.3SE's run? Do the resistors get hot anyway or is something not right?

I tried disconnecting one of the modules electrically from the cassis earth in case the source used the mains earth as a signal ground and that was what the problem was, but it doesn't make a difference, the resistors still get slowly hotter.

It may have done this before but I did not notice as the music was coming out just fine! Do other peoples amps do this too?

Thanks!

Now I'm not sure if they get hotter when I push the amp harder or not... they get to a point where I can not keep my finger on them and seem to stay there. I suspect the 5watt resistor would fail after a while, maybe I just need a 10watt jobbie on there.
Click to expand...


What is very hot? I remember that in my case when I did not have oscillations they get quite warm (hot?). When I had oscillations, they went up in smoke in no-time. So I guess if they don't go up in smoke in a few seconds it is probably OK.

If you have access to a scope, you could check for oscillations. Normally you should only see on oscillation of about 400kHz.

Best regards

Gertjan
 
#23
Hi,

I have to join the RCA grounds together so I can use the standby mode for both units with only one switch (LC Audio said to do it that way) but I will try it without them like that. I don't remember the resistors used to get that hot before it completely blew!

I'll take a look on the scope too.

The resistors were getting pretty hot after a while, too hot to touch, but it did take 2 or 3 minutes.

Thanks for the usggestions I wil give them a shot when I have time.

Oh and I did change the bubble for gate drive, it gets hot both ways.
 
#24
Speaking of this. When I woke up this morning, my left speaker was dead. It was a smell that was not to be mistaken.
One zappulse module had exploded totally. My zappulse monoblocks have performed flawlessly for several years but today - on my birthday-- :angel: , it was gone. I was really shocked how it looked inside the chassis. Not only the 2.2 ohms resistor but many more components was totally smelted and was all around the chassis. I will take some pictures and post it here.


I hope none of the speaker drivers have been destroyed.
 
#26
Why not? Cannot see any reason why it should be turned off every day. If I travel I always turn it off. Some manufactures even suggests that the equipment should be on 24/7.
Here is a picture. Not a pretty sight.
 

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#27
bambadoo said:
Why not? Cannot see any reason why it should be turned off every day. If I travel I always turn it off. Some manufactures even suggests that the equipment should be on 24/7.
Here is a picture. Not a pretty sight.
Click to expand...


Wow, that looks really nasty. I always turn my amps off. do not want to risk starting a fire in my house by keeping amps on while I`m not around.

Gertjan
 
#28
One more picture.
BTW: The preamp is fine, I will analyse the PSU later.

I have blown a couple of speaker elements some years ago. 2* Dynaudio woofers, and 1* Scan Speak 10" woofer. That was because of a faulty v4p psu module from lcaudio. Returned it, and made my own psu. Never had any trouble later. Until today.
 

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#29
bambadoo said:
One more picture.
BTW: The preamp is fine, I will analyse the PSU later.

I have blown a couple of speaker elements some years ago. 2* Dynaudio woofers, and 1* Scan Speak 10" woofer. That was because of a faulty v4p psu module from lcaudio. Returned it, and made my own psu. Never had any trouble later. Until today.
Click to expand...


Are those ELNA Cerafines OK? I have them in use as well. Hope they were not the cause?

Gertjan
 
#33
Hi,

Digging up an old thread...

I gave the amp another go today and swapped the wiring carrying the input signal for heavily shielded ones and joined them as close to the board as possible to keep them well shielded.

Well, I'm pretty sure the resistor in the zobel network is not getting as hot now. I also moved the arrangement about to keep all wires away from the inductor as I think it feeds back in to itself via the wires, causing oscillation.

Anyway it still gets pretty hot on that resistor. Can I ask any owners of the 2.3SE module to run the amp for 5min and tell me how hot the resistor in the zobel network is getting? Can you keep your finger on it for more than a few seconds with a firm pressure?

Thamks!
 
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