JBL MPX600 Repair?

electroaudio · 3rd May 2006, 10:26 PM

Is it difficult to repair that amp or is it easy?

I do repair amps occasionally but failed with a jbl 6290 once, it was just a black hole left in it after a couple of hours at a club and i dont want to risk anything with this amp.

-Are there any special pitfalls on MPX amps to watch out for?

electroaudio · 5th May 2006, 07:38 PM

Second question..
Is it possible to lower the dampingfactor on this amp?
It is roughly 50 times higher than what is recommended for the speakers.

latala · 6th May 2006, 09:59 AM

The damping factor is also related to the Loudspeaker leads it not really any use measuring at the amp terminals. You should measure at the speaker terminals. This will then include the resistance of the leads the differrance can be quite enourmouse
regards Trev

latala · 6th May 2006, 10:03 AM

You could also include a small value resistor maybe 0.2 ohms in the speaker leads.
If you wanted to get really into it try the resistor in the bottom leg of the feedback network and then connect the return leg of the speaker to that junction !
But i would advise caution.
regards Trev

electroaudio · 8th May 2006, 10:13 AM

Thanks,
I probably have more than 0.2 ohm in connector/lead resistance so it seems that i am probably looking in the wrong place here...

Nigel Goodwin · 8th May 2006, 11:38 AM

Damping factor isn't anything to worry about, and certainly not if you're trying to find a fault.

What is the matter with the amp anyway?.

Nigel Goodwin · 8th May 2006, 11:48 AM

Just had a quick google, you can download the circuit here

electroaudio · 8th May 2006, 12:41 PM

One channel has burnt down and the other channel is making a clicksound about a couple of seconds apart.
-I havent looked at it so closely, just opened the lid and put it back.
But i remember there were some burned fuses and exploded powercapacitors there.

-Just wondering if i should send it directly to repair or if its worth to try it myself...

(The dampigfactor-sound is probably related to my bassbins so i have to rebuild them i think. I have several MPX amps both 600 and 300)

Nigel Goodwin · 8th May 2006, 01:03 PM

Quote:

Originally posted by electroaudio
-Just wondering if i should send it directly to repair or if its worth to try it myself...

If you have to ask?, I suggest you don't try it

electroaudio · 8th May 2006, 06:14 PM

Quote:

Originally posted by Nigel Goodwin

If you have to ask?, I suggest you don't try it

Nono, im not good but i am not that bad

-Just wonder if its a hard amp to fix or an easy one. If its a hard one then i wont even try but if its a normal/easy one then i do it myself unless i get too lazy.

3rd May 2006, 10:26 PM	#1
electroaudio diyAudio Member Join Date: Mar 2004 Location: stockholm	JBL MPX600 Repair? Is it difficult to repair that amp or is it easy? I do repair amps occasionally but failed with a jbl 6290 once, it was just a black hole left in it after a couple of hours at a club and i dont want to risk anything with this amp. -Are there any special pitfalls on MPX amps to watch out for?

8th May 2006, 11:38 AM	#6
Nigel Goodwin diyAudio Member Join Date: Jul 2005 Location: North Derbyshire	Damping factor isn't anything to worry about, and certainly not if you're trying to find a fault. What is the matter with the amp anyway?. __________________ Nigel Goodwin

8th May 2006, 11:48 AM	#7
Nigel Goodwin diyAudio Member Join Date: Jul 2005 Location: North Derbyshire	Just had a quick google, you can download the circuit here __________________ Nigel Goodwin

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5th May 2006, 07:38 PM	#2
electroaudio diyAudio Member Join Date: Mar 2004 Location: stockholm	Second question.. Is it possible to lower the dampingfactor on this amp? It is roughly 50 times higher than what is recommended for the speakers.

6th May 2006, 09:59 AM	#3
latala diyAudio Member Join Date: Feb 2006 Location: staffordshire	The damping factor is also related to the Loudspeaker leads it not really any use measuring at the amp terminals. You should measure at the speaker terminals. This will then include the resistance of the leads the differrance can be quite enourmouse regards Trev

6th May 2006, 10:03 AM	#4
latala diyAudio Member Join Date: Feb 2006 Location: staffordshire	You could also include a small value resistor maybe 0.2 ohms in the speaker leads. If you wanted to get really into it try the resistor in the bottom leg of the feedback network and then connect the return leg of the speaker to that junction ! But i would advise caution. regards Trev

8th May 2006, 10:13 AM	#5
electroaudio diyAudio Member Join Date: Mar 2004 Location: stockholm	Thanks, I probably have more than 0.2 ohm in connector/lead resistance so it seems that i am probably looking in the wrong place here...

8th May 2006, 12:41 PM	#8
electroaudio diyAudio Member Join Date: Mar 2004 Location: stockholm	One channel has burnt down and the other channel is making a clicksound about a couple of seconds apart. -I havent looked at it so closely, just opened the lid and put it back. But i remember there were some burned fuses and exploded powercapacitors there. -Just wondering if i should send it directly to repair or if its worth to try it myself... (The dampigfactor-sound is probably related to my bassbins so i have to rebuild them i think. I have several MPX amps both 600 and 300)

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