dragster da606 in protection

marko · 27th November 2007, 04:03 PM

got a dragster da606 recently off ebay supposedly full working order, but soon as i put power to it it goes into protection (red led comes on), any ideas what this could be? had a peak inside and there's no obvious damage apart from there was a burnt rca trace??

mark

ppia600 · 27th November 2007, 04:20 PM

Was that the one for $70 plus shipping? It did say it worked perfectly. How are your subs wired to it?

marko · 27th November 2007, 05:54 PM

no, i bought it over here, it hasn't got anything running off it as it has no output because it's in protection...

Perry Babin · 27th November 2007, 06:04 PM

Assuming that you repaired the burned trace...

If the amp goes into protect, it's very likely that you have at least one shorted output transistor. If you check the resistance from the center leg to the right-most leg and have any that read near 0 ohms, they are defective or are in parallel with a defective transistor.

Check them with no power applied to the amplifier.

marko · 27th November 2007, 06:25 PM

just tested them all and one of the outputs is reading only 1.5ohm, all the rest are into kohms..

they are irf530n's, if this is shorted will it cause the amp to go into protection then?

ppia600 · 27th November 2007, 06:27 PM

yep

Perry Babin · 27th November 2007, 06:29 PM

Well ppia600, it looks like you learned to type faster.

marko · 27th November 2007, 06:35 PM

thanks chaps, had a quick look on ebay and i can get one for £4.49 posted, expensive i know but if it gets the amp back up and running it's money well spent

mark.

ppia600 · 27th November 2007, 07:11 PM

I'd ask Perry, but you might want to change all of the 530 fets in that channel with matched dates if possible. It seems mosfets only like close family members and tend to get into "heated" arguments with fets from other families, haha

Perry Babin · 27th November 2007, 07:20 PM

If there are parallel components, you'd need to change all that were in parallel. From what I could find on the net, it's unlikely that this amp has more than the minimum number of transistors needed. That would mean that there are no parallel components in the audio section.

He also said that only one was reading low. That would seem to indicate that there were no others in parallel (unless he pulled one or more from the board).

Although I'd prefer to see all of the transistors in the blown channel changed, it's not absolutely necessary. You can use mixed date codes in an individual channel as long as the date codes match for the parallel components.

27th November 2007, 04:03 PM	#1
marko diyAudio Member Join Date: May 2004 Location: donnyuk	dragster da606 in protection got a dragster da606 recently off ebay supposedly full working order, but soon as i put power to it it goes into protection (red led comes on), any ideas what this could be? had a peak inside and there's no obvious damage apart from there was a burnt rca trace?? mark

27th November 2007, 04:20 PM	#2
ppia600 diyAudio Member Join Date: Jun 2007 Location: Louis y ana	Was that the one for $70 plus shipping? It did say it worked perfectly. How are your subs wired to it? __________________ Don't worry... you can always turn the gain down!

27th November 2007, 06:04 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Assuming that you repaired the burned trace... If the amp goes into protect, it's very likely that you have at least one shorted output transistor. If you check the resistance from the center leg to the right-most leg and have any that read near 0 ohms, they are defective or are in parallel with a defective transistor. Check them with no power applied to the amplifier. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

27th November 2007, 06:27 PM	#6
ppia600 diyAudio Member Join Date: Jun 2007 Location: Louis y ana	yep __________________ Don't worry... you can always turn the gain down!

27th November 2007, 06:29 PM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Well ppia600, it looks like you learned to type faster. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links


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27th November 2007, 05:54 PM	#3
marko diyAudio Member Join Date: May 2004 Location: donnyuk	no, i bought it over here, it hasn't got anything running off it as it has no output because it's in protection...

27th November 2007, 06:25 PM	#5
marko diyAudio Member Join Date: May 2004 Location: donnyuk	just tested them all and one of the outputs is reading only 1.5ohm, all the rest are into kohms.. they are irf530n's, if this is shorted will it cause the amp to go into protection then?

27th November 2007, 06:35 PM	#8
marko diyAudio Member Join Date: May 2004 Location: donnyuk	thanks chaps, had a quick look on ebay and i can get one for £4.49 posted, expensive i know but if it gets the amp back up and running it's money well spent mark.

27th November 2007, 07:11 PM	#9
ppia600 diyAudio Member Join Date: Jun 2007 Location: Louis y ana	I'd ask Perry, but you might want to change all of the 530 fets in that channel with matched dates if possible. It seems mosfets only like close family members and tend to get into "heated" arguments with fets from other families, haha __________________ Don't worry... you can always turn the gain down!

27th November 2007, 07:20 PM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	If there are parallel components, you'd need to change all that were in parallel. From what I could find on the net, it's unlikely that this amp has more than the minimum number of transistors needed. That would mean that there are no parallel components in the audio section. He also said that only one was reading low. That would seem to indicate that there were no others in parallel (unless he pulled one or more from the board). Although I'd prefer to see all of the transistors in the blown channel changed, it's not absolutely necessary. You can use mixed date codes in an individual channel as long as the date codes match for the parallel components. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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