Soundstream Rubicon 604 not powering on

azvrt · 24th January 2012, 08:45 PM

I tried to power up the Soundstream Rubicon 604 I bought with unknown malfunction.
It draws absolutely zero current. Fuses are good and do not blow.

Next time we work on the amp we'll check the schematics and follow the path, maybe check how the remote functions.

Any pointers where to look first ?

timwebb · 24th January 2012, 08:47 PM

the voltage on the pwm.

azvrt · 24th January 2012, 08:49 PM

You're faster than your own shadow !

What does pwm stand for ? Pulse Width Modulator ? Would that be the SG3524 chip ? (just guessing)

azvrt · 02:42 PM

Alright, got the measurements from the SG3524 chip.
Got the datasheet from the web. I put the negative lead on PIN1, is that alright ?

Positive lead on PIN:

1 -
2 1.95 VDC
3 0.15 VDC
4 -6.8 milliVDC
5 -6.8 milliVDC
6 3.01 VDC
7 1.96 VDC
8 -6.8 milliVDC
9 3.86 VDC
10 -3.7 milliVDC
11 0.28 VDC
12 12.22 VDC
13 12.22 VDC
14 7.25 VDC
15 12.22 VDC
16 4.63 VDC

Afterwards I removed the board from the heatsink and noticed damage to the underside which I had not noticed looking from topside. Here are some pics:

I previously owned a 604 like this one, but can't remember for sure whether the parts indicated in the following picture were on it. Are they supposed to be ?

azvrt · 9th February 2012, 02:43 PM

Damn, can't get the pics to show properly. Here are the links:

ImageShack® - Online Photo and Video Hosting
ImageShack® - Online Photo and Video Hosting
ImageShack® - Online Photo and Video Hosting
ImageShack® - Online Photo and Video Hosting
ImageShack® - Online Photo and Video Hosting

1moreamp · 9th February 2012, 04:19 PM

I see soot marks on the Kapton insulator this makes me think your mosfets are shorted and the gate resistors look fried also. it is likely that the gate driver transistors also failed

azvrt · 9th February 2012, 05:01 PM

I wish I knew what gate resistors and gate driver transistors are

Anyway, I was planning to replace all six of the transistors I already desoldered two of (Q145 etc).
I'll probably replace the four nearby tiny upright resistors, which are located between the transistors and group of five capacitors, as at least one of them showed it hat gotten hot, though that might have been caused by me touching it by accident (incompetence

) with the soldering iron

24th January 2012, 08:45 PM	#1
azvrt diyAudio Member Join Date: Dec 2010 Location: Netherlands	Soundstream Rubicon 604 not powering on I tried to power up the Soundstream Rubicon 604 I bought with unknown malfunction. It draws absolutely zero current. Fuses are good and do not blow. Next time we work on the amp we'll check the schematics and follow the path, maybe check how the remote functions. Any pointers where to look first ?

9th February 2012, 02:40 PM	#4
azvrt diyAudio Member Join Date: Dec 2010 Location: Netherlands	Alright, got the measurements from the SG3524 chip. Got the datasheet from the web. I put the negative lead on PIN1, is that alright ? Positive lead on PIN: 1 - 2 1.95 VDC 3 0.15 VDC 4 -6.8 milliVDC 5 -6.8 milliVDC 6 3.01 VDC 7 1.96 VDC 8 -6.8 milliVDC 9 3.86 VDC 10 -3.7 milliVDC 11 0.28 VDC 12 12.22 VDC 13 12.22 VDC 14 7.25 VDC 15 12.22 VDC 16 4.63 VDC Afterwards I removed the board from the heatsink and noticed damage to the underside which I had not noticed looking from topside. Here are some pics: I previously owned a 604 like this one, but can't remember for sure whether the parts indicated in the following picture were on it. Are they supposed to be ? Last edited by azvrt; 9th February 2012 at 02:42 PM.

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24th January 2012, 08:47 PM	#2
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	the voltage on the pwm.

24th January 2012, 08:49 PM	#3
azvrt diyAudio Member Join Date: Dec 2010 Location: Netherlands	You're faster than your own shadow ! What does pwm stand for ? Pulse Width Modulator ? Would that be the SG3524 chip ? (just guessing)

9th February 2012, 02:43 PM	#5
azvrt diyAudio Member Join Date: Dec 2010 Location: Netherlands	Damn, can't get the pics to show properly. Here are the links: ImageShack® - Online Photo and Video Hosting ImageShack® - Online Photo and Video Hosting ImageShack® - Online Photo and Video Hosting ImageShack® - Online Photo and Video Hosting ImageShack® - Online Photo and Video Hosting

9th February 2012, 04:19 PM	#6
1moreamp diyAudio Member Join Date: Dec 2005 Location: Northern California	I see soot marks on the Kapton insulator this makes me think your mosfets are shorted and the gate resistors look fried also. it is likely that the gate driver transistors also failed

9th February 2012, 05:01 PM	#7
azvrt diyAudio Member Join Date: Dec 2010 Location: Netherlands	I wish I knew what gate resistors and gate driver transistors are Anyway, I was planning to replace all six of the transistors I already desoldered two of (Q145 etc). I'll probably replace the four nearby tiny upright resistors, which are located between the transistors and group of five capacitors, as at least one of them showed it hat gotten hot, though that might have been caused by me touching it by accident (incompetence ) with the soldering iron