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marko 27th November 2007 03:03 PM

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??


ppia600 27th November 2007 03:20 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 04:54 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 05:04 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 05:25 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 05:27 PM


Perry Babin 27th November 2007 05:29 PM

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

marko 27th November 2007 05:35 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 :)


ppia600 27th November 2007 06:11 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 06:20 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.

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